Saturday, July 24, 2010

How exactly does chloroxylenol kill bacteria?

Wikipedia has a very brief explanation, and I can't find more details on the web :(

How exactly does chloroxylenol kill bacteria?
It's basically like a proton gradient disruptor. Bacteria use proton gradients to produce ATP. As H+ falls through the ATP synthase down the gradient, it drives this ATP synthesis. Chloroxylenol destroys this gradient. Consequently, the bacteria cannot produce ATP and starve to death.
Reply:chloroxylenol is a modified chlorinated xylene compound. It is a potent antiseptic that has a very broad spectrum of susceptible bacteria, and fungi. It is a majopr component in the disinfectant dettol.


I cannot do better than the entry in Wikipedia;


Here goes;


Chloroxylenol (4-chloro-3,5-dimethylphenol) is a chemical compound with the formula C8H9ClO and CAS number 88-04-0. It is commonly used in antibacterial soaps such as Dettol; in agar patch studies, it has been found to kill a wide variety of microbes, including bacteria, fungi, and the superbug MRSA, within 15 seconds. Its antibacterial action is due to disruption of cell membrane potentials, blocking production of adenosine triphosphate (effectively starving the cells).





Chloroxylenol is not significantly toxic to humans and other mammals but is toxic to fish. It is a mild skin irritant and may trigger allergic reactions in some individuals. In a 125 ml bottle of Dettol, there is usually 48 mg/mL (4.8% W/V) of Chloroxylenol in the solution


Cheers!

camellia

What is the difference between Bacteria and Virus which causes diseases of human beings?

Both infect the human bodies, but both have different genetic structures and can harm you in different ways.





bacteria are single celled organisms with a structure similar to that of a human cell. They have a nucleus, cell membrane and cytoplasm, like a human cell. They reproduce in the human body by asexual reproduction, which means that there is only or 'parent' and the cell splits to create another perfect copy, or clone, of the cell it split from. Bacteria can be slowed or denatured (killed) by anti biotics, except for MRSA bacteria which has formed a resistance to our antibiotics.





Viruses arent really living things as they only posses one of the 7 characteristics needed for life, this characteristic is reproduction. Also, a virus isnt even really a cell. It is a single strand of genetic material covered by a protein coat. Once inside the body it lands floats around until a cell comes by then it lands on it and often injects a poison into the cell. This poison changes the cells DNA, often to create another virus. . Once the copied virus has grown they break out of the weakened cell and float around like the parent virus. Viruses are unnafected by anti biotics because they dont eat like a living organism does, or respire, so there is no way of getting the antibiotic into the virus. So viruses are much harder to treat, as they must be left to be fought off by the body. However because they are resistant some viruses cannot be fought off by the body, an example is HIV and AIDS. this is why there is no cure for them and why it is likely there wont be one in the near future

What is the difference between Bacteria and Virus which causes diseases of human beings?
Bacteria are single celled organisms, a virus is a packet of genetic information that invades a cell and changes the cells DNA, produces an unwanted side effect. Virus cells are hard to find and fight because they live inside your own cells, therefore your body doesn't realise they are there, bacteria your body can easily identify as an invader as it has a differant protein coat that your normal cells. Bacteria have a sticky layer round teh outside of them to protect them from attack and help them clump together :) fun stuff
Reply:Can't say it better than Blondie - what she said!
Reply:Bacteria - very small single celled life forms that can exist independently or as a parasite being dependent on other life forms for its continued existence.





Virus - a single celled life form smaller than a bacteria which cannot grow or reproduce apart from a living cell. They invade and attack cells.





Bacteria can be seen under a microscope whilst virusus due to their extremely small small can be seen only under an electron ,miscroscope
Reply:good answer from blondie.......


only thing to add, is that virus's are tens of thousands of times smaller than bacteria.





bacteria - can be seen through a microscope





virus - would need a scanning electron microscope to see it


Can halitosis involved anaerobic oral bacteria be erased by mouthwash oxidizing agents?

If so, which are most suitable? Thanks!

Can halitosis involved anaerobic oral bacteria be erased by mouthwash oxidizing agents?
Yes, Listerine, Oral B and Cepacol are the best. Scope and other cheap brands are not as effective. Crest has a mouthwash out now, I don't know if it's any good or not.
Reply:Gargling saltwater is good against oral bacteria too and has anti inflamatory and other bennifits


Is it true ur bodys bacteria eats ur flesh in the grave not insects??

well your body rots so i suppose yes is the answer to your question..

Is it true ur bodys bacteria eats ur flesh in the grave not insects??
Yes, that and maggots.
Reply:Bacteria are already trying to eat you. Being alive, you regenerate and your immune system help to destroy the bacteria.





When you die, that all stops and the Bacteria have at it.





But just as with the insects, the right environment must exist.





Your internal organs will most likely always be moist, and much warmer then your exterior. So those will be eaten first, the bacteria will release gas while eating, causing bloating with possible explosive results.
Reply:Yes, it would do that if you were alive and never washed for a long time too
Reply:yes, technically, it will break down your body as you lay there.
Reply:http://youtube.com/watch?v=v2u_B3W3ibE
Reply:Don't really care, but I expect it's a bit of both. Yum...
Reply:Yes, bacteria does most of the work. Remember, you have about 2 kg bacteria in your intestines helping you digest your food. When you die these bacteria don't die with you - they flourish and break through the mucus that kept them at bay, "eating" everything in its sight. Maggots come along later and finish off the job, with some help from a certain selection of beetles and other animals. It's quite an interesting process.
Reply:Yes it is very true. Bacteria will migrate from the digestive tract to different parts of the body and decompose the flesh. Migration of bacteria is due to lack of defense mechanism in intestinal wall after death. The phagocytic cells will die with you. And if you die and not buried you will also decompose on the same.
Reply:It all depends on your culture or religion. In Western predominately Christian culture your body is embalmed and place in a casket. That's what an undertaker does. So, there is little chance for biological activity post mortum.





Other places and cultures do not embalm. You maybe buried in the ground shortly after your die. In that case bacteria will have begun attacking your body shortly after death and continue until you have rotted beyond use. If the body is exposed to the elements in the ground, many other animals and microbes will feed upon it as well, round worms, flat worms, insects and even a few mammals.


In bacteria-size mitochondria,both plant and animal cells produce---------,expelling----... that process

a.glucose,water


b.glucose,oxygen


c.atp,water


d.atp,oxygen

In bacteria-size mitochondria,both plant and animal cells produce---------,expelling----... that process
c. atp and water

lady slipper

Staphylococcal bacteria?

Staphylococci are gram positive bacteria that "reside" in our skin and in our body; "reside" meaning normal microflora. There are pathogenic species of staphylococci present in our body. It is a complex process during infection. There are certain factors that you need to consider-immune response, type of species/strain that infected you, etc.





One of the recent concerns in public health is the emergence of multi-drug resistant bacteria. Most popular, I think, is the Methycillin-resistant Staphylococcus aureus (MRSA). Infection with these strains of bacteria is serious and sometimes lethal.

Staphylococcal bacteria?
It will give you staph. Depending on how healthy you are, if you infected by this bacteria, it could take days to get you really really sick.
Reply:what are you trying to ask?


The pathogenesis, the virulence, the people who work on it, or the non-pathogenic strain?


Please define your question.


Which bacteria are UK university level students allowed to work with?

Any idea which bacterial species are considered 'safe' for uni levels students to work with, trying to work out what I am allowed to use as far as health and safety laws go!

Which bacteria are UK university level students allowed to work with?
I have just started a biology degree, so I'll tell you what we've worked with so far (have only done 2 practicals) :)


Bacillus cereus


Staphylococcus albus


Klebsiella aerogenes


Streptococcus pneumoniae (non-virulent strain, otherwise very dangerous!)
Reply:good bacteria.. I've seen them advertised
Reply:Any that they grow in their underpants %26amp; socks.


3000 bacteria with a growth constnt 3.8 are present at begining of experment howmanyhr wil there be 15000?

Bacterial growth is given by


dN/dt = kN


where dN is the change in number of bacteria over time (dt) which is equal to a constant (k, a first-order rate constant in reciprocal time units) multiplied by the number of cells at a given time, t





So,


dN/dt = kN


(15000-3000)/dt = 3.8 * 3000


12000/dt = 11400


12000/11400 = dt


1.053 = dt





So, in a little over an hour, you will have 15000 bacteria, assuming the units of the growth constant are per hour.


Which Bacteria can be normal flora of stool during gastroenteritis??

Recently we had a quality control sool specimen that we had to find the pathogen pacteria and also report all other normal flora of it! we found salmonella sp. as real pathogen while it had black colonies on XLD agar and dark point center colonies on EMB agar.on the Blood Agar we had 2 type of colonies one of them was same salmonella other one are gram possitive abit long bacilli which they didn't growth on EMB.what do you think, can they be normal flora??how can we determine them rapidly???





Thanks and Regards.

Which Bacteria can be normal flora of stool during gastroenteritis??
In order to determine what the Gram + rods are, you would have to do some sort of biochemical tests.. The fastest way would be to do a crystal on it, which just has to incubate overnight and you read the results the next day. But for normal flora in a stool sample...that could be anything!

dendrobium

Do bacteria control rust?

I shall expand on the last answer.


Absolutely not. Iron plus water = rust.





put another way Fe + O2 = FE02

Do bacteria control rust?
no
Reply:there may be a certian type of bacteria but other than that probally not.
Reply:No, bacteria and rust have nothing to do with one another.
Reply:No... BUT... if the presence of the bacteria somehow means that there is a greater surface area to the iron (i.e. the iron being stripped off by the bacteria and left exposed), then the oxidation reaction causing the rust will be catalysed.





Aside from that, or other possible biochemical catalysis... the answer is an overwhelming NO.
Reply:Rust is the result of the oxidation of iron. Bacterial growth, in most cases, is a function of the availability of a reduced carbon food source in an appropriate environment.


Can bacteria in your carpet cause damage over time?

Yes, even if you get it off the top fibers and it's in the base of the carpeting and pad this can continue to grow. Put some ammonia on it and let it dry this will even kill mildew.

Can bacteria in your carpet cause damage over time?
Damage to the carpet itself? Perhaps if it's made of natural fibers the bacteria might degrade it. If it's any sort of man-made fiber (nylon or other plastic type fiber) then you're probably safe.





If you're concerned about it you can always spray the carpet with an anti-bacterial spray that's used to "freshen" fabrics or the air in the room. That should kill any of the common bacteria present and it shouldn't harm the carpet as long as it's a light misting and the carpet isn't soaked in the stuff.





Good luck!


What bacteria are in plaque?

i need to know which of these : bacilli, cocci and spirilla


are in plaque which not, and what their abundance is and what they do!

What bacteria are in plaque?
There millions of bacteria in plaque! Yuck!





Bacilli and cocci are definitely in there, I am not certain about spirilla.





The bacilli family of bacteria are linked to food poisoning (there are several types of bacilli bacteria).





The cocci family of bacteria...easy one. Streptococcus or staphylococcus aureaus (various strep and staph infections). Those are just two out of many.





Try googling the bacteria to see what you get. There's a plethuora of info out there. :)
Reply:http://en.wikipedia.org/wiki/Plaque





I would say whichever kind is in your mouth.
Reply:I would say whichever kind is in your mouth


Are bacteria invertebrates?

In its simplest terms, invertebrates are creatures without spinal columns (or something resembling one). So yeah, I guess you could say bacteria are invertebrates simply off of that.


But vertebrate/invertebrate is a method of breaking up different categories in the animal kingdom, not so much for categorizing bacteria.


It's like saying.. this bacterium has a cell wall. Plants have cell walls. Therefore this bacterium is a plant.

Are bacteria invertebrates?
if you want to argu the point, then maybe


but


NO!!!!!!!!!!!!!!!!!!
Reply:No, bacteria are in their own Kingdom.
Reply:No. Bacteria are in a separate branch of the tree of life and not considered animals. Invertebrates are animals without vertebrae (spinal column, notochord, etc)
Reply:Of course they are. They have no vertebral column, and by virtue of that itself they become invertebrates. Besides, they arent even higher organisms, so the question doesnt even arise.
Reply:I aint never seen no spine in a bacteria ! Thats crazy.. I wanna meet this bacteria!
Reply:The bacteria are classed differently from both vertebrates and invertebrate species. they are neither

broadleaf

Does bacteria contain trilinolein?

I don't think bacteria can synthesize trilinolein however they can uptake trilinolein from a substrate. Check out this article:


Smallest bacteria?

The smallest known bacteria belong to the type called phytoplasma.

Smallest bacteria?
The smallest known bacteria belong to the type called phytoplasma, which infect plants much as the mycoplasmas infect animals.





Many bacteria are shaped like a gelatin medicine capsule. One such organism, Haemophilus influenzae (it was once thought to cause influenza) is among the smallest bacteria: 0.2–0.3 by 0.5–2.0 micrometers, which is about the smallest object that can be seen through a light microscope. Escherichia coli, the bacteria used in testing water for fecal contamination, has a similar shape and is about 7 μm long and 1.8 μm in diameter.





Many bacteria are long and slender, only 1 or 2 μm wide but 10 to 20 μm long. For comparison, a human red blood cell is 8 μm in diameter.
Reply:Tinyschminycoccus.


Is bacteria mentioned in the bible? Why did Jesus wash feet and not hands?

Yes, its been proven that the microscope was actually invented by an unknown son of Moses by an Eqyptian woman and they were able to see bacteria. NOT





Sickness is known throughout history, to all who believe and did not believe. Likely this is why there are thousands of Old Testament laws regarding the preparation of food. Apparently at least the Isrealites realized that cleanliness was needed to keep people from falling ill.





The washing of feet is a sign of humbleness and respect. It's quite a moving experience if you have not done this. (If you are not religious you probably have not other than your mom wiping your feet and bum when you were a baby). It is not a cleanliness issue.





The Skeptical Christian


Grace, Hope, Love, Faith, Peace, Freedom


PEG

Is bacteria mentioned in the bible? Why did Jesus wash feet and not hands?
because jesus had a thing for feet.
Reply:Sara, he had a talent I'm not obliged to go into detail about on here.
Reply:He washed his disciples feet to show humility and if a man without sin can be humble, then we should be more humble.


.
Reply:No one knew about bacteria in biblical times. They weren't discovered until the 17th century.


Washing someone's feet was an act of humility and respect. They washed feet, because the feet got hot, tired and dirty from walking. Washing them was a soothing, refreshing and rejuvenating thing to do for someone.
Reply:It was an act of humble servitude.
Reply:the feet were what got dusty as they walked not the hands.
Reply:Because they wore sandals and didn't have sidewalks back then and there - so feet got really dirty. To show humility to his disciples, he washed their feet as a slave should have done in those times. I'm sure the point is that feet were dirtier and therefor would have been a more humble or even humiliating job.
Reply:I hope you are not serious. They didnt know about bacteria. (unless Jesus had a microscope he didnt mention) Why would you ask such a stupid question? The feet washing was a way of offering gratitude. Not for hygene.
Reply:Bacteria was unheard of in Biblical times. However, much of the dietary laws of the Old Testament can be linked to health concerns of the time. They just did not have the knowledge of bacteria or parasitic infection at the time.
Reply:People walked wherever they went in those days, so the feet would get very dirty and stinky.


Washing the feet was the lowest of the low jobs a servant had. THis was to serve as an example of what we should do. We should be humble like Christ was humble and we should serve others as Christ served others.
Reply:Great question! No one knew bout bacteria then so they thought it must be something from the gods or Jesus. This is one of the reasons that book can not be accurate. None of it makes sense. I'm sure they had sicknesses they called plagues but they were probably just colds or some other virus.
Reply:The washing of feet was a gesture of subservience. Had nothing to do with cleanliness (except for maybe keeping sand out of the bed!)


Bacteria is mentioned indirectly as 1) an object of creation, 2) in the spoiling of food, 3) in illnesses that we now know are bacteriological.
Reply:How do you know Jesus didn't wash His hands? How do you know He didn't take a bath? The Bible isn't gonna mention stuff like that. One woman washes His feet and you assume that He didn't wash His hands? He may have washed His hands earlier and no one bothered to put that in the Bible because it was so, very unimportant. Bacteria is not mentioned but, Jesus was very much against uncleanliness. I assume that Jesus knew of bacteria but, didn't bother to explain it because the concept of bacteria was so far beyond anyone's understanding back then and Jesus just didn't want to get into it.
Reply:The root of this practice appears to be found in the hospitality customs of ancient civilizations, especially where sandals were the chief footwear. A host would provide water for guests to wash their feet, serve the guests by washing their feet, or even provide a servant to wash the feet of the guests. This is mentioned in several places in the Old Testament of the Bible (e.g. Genesis 18:4; 19:2; 24:32; 43:24; I Samuel 25:41; et al.), as well as other religious and historical documents. A typical Eastern host might bow, greet, and kiss his guest, then offer water to wash his feet. Though the wearing of sandals might necessitate washing the feet, the water was also offered as a courtesy even when shoes were worn.
Reply:Bacteria is not mentioned per se, however there are several Old Testament cleanliness laws that may have seemed foolish then but are understandable today because of our knowledge of germs. For example, if someone touched the carcass of a dead unclean (predators, lizards, rodents, etc.) animal, he was to wash his clothes. If a lizard or a rodent died and fell on any garment or utensil, it was to be cleaned. As for Jesus washing their feet, it was a symbol of being a servant. In those days everyone wore sandals and as there were not many paved roads and animals were used for transportation, you can imagine how filthy their feet would become. Typically, the lowest servant in the house would get the job of washing people's feet. So when Jesus did it for the disciples, He was showing how He was a servant and they were to be servants also. By the way, Jews were required to wash their hands under running water before eating.
Reply:Germs


People didn't understand the biological nature of germs until relatively recently (the last few hundred years). Yet in the Old Testament cleanliness laws and food laws, you have an obvious understanding of germs. But those instructions from God came thousands of years before man even understood how germs were transmitted, or even what they were.
Reply:Cleanliness is enjoined in the Bible. You will recall they had to bathe and wash their clothes before approaching Sinai, and carry a spade to cover their feces.





God did not give a course in microbiology, He just wanted them to obey him by faith. That is why He told them they must quarantine themselves and wash body and clothes after "defiling" by touching anything that died of itself.





Had people read the Bible during the bubonic plague, they would not have died after touching dead rats.





Break the Bible code at www.revelado.org/revealed.htm
Reply:no his hands get washed automaticly when he used his wet hands to wash his feet
Reply:Do you know that he didn't wash his hands?
Reply:1. Sure! Wright after where it talks about space travel. 2. Maybe he had a foot fetish.
Reply:Doesnt say jesus did not wash his hands it is just the act of washing feet was a symbolic gesture.
Reply:People walked everywhere. Think about the symbology involved, also. He was cleansing their "soles". He was giving them comfort by refreshing dirty tired feet and keeping the road dust out of the dwelling place.





Think about foot reflexology. He was wishing them health by washing their feet. Feet are considered our physical foundation, we stand and walk on them. We need the balance of rest and relaxation.





He was doing much more than just washing feet, he was teaching a lesson in humility and service to others.





Germs were not apart of their knowledge base at that time. Unless you put it in the "things unseen" category. There are verses that requested cleanliness, but they were generally when dealing with spiritually holy things. It usually was not required on a daily basis, unless you dealt with the dead on a daily basis.


If it looks like a bacteria, and moves like a bacteria, then it must be a _________ ?

Prokaryotic cell. This could be a trick question as some, but very few eukaryotic cells act like a bacteria (prokaryotic cell).

If it looks like a bacteria, and moves like a bacteria, then it must be a _________ ?
some type of a unicellular organism. Most likely bacteria.
Reply:BACTERIA.....i think


is that a BIO question or a philosophy one....
Reply:bacteria, I suppose.
Reply:Taco?
Reply:lawyer.
Reply:Yeast?





Nucleated virus?





Dinner. Yep that must be the right answer, dinner.





Well, unless it actually is a bacteria.
Reply:a bacteria
Reply:Herpes
Reply:unicellular organism.
Reply:a different form of a bacteria orgasm that can grow anywhere and cause alot of medical problems...you know what i mean

night jasmine

Biology/bacteria question?

what are two structures found in EUGLENA that are not found in PARAMECIUM???

Biology/bacteria question?
A euglena has a flagellum.





Generally, a euglena will also have an organelle that's called a "chloroplast." It may have several of these.





A euglena has a photoreceptor that's sometimes called an "eyespot."
Reply:Neither are bacteria.





Really depends on what the teacher is looking for. Flagellum for sure. see links for other.





http://www.infovisual.info/02/001_en.htm...


http://www.infovisual.info/02/004_en.htm...


Counting bacteria?

Calculate the bacterial count per ml of sample of a pure culture after serial dilution.





Im lost i dont understand how to do this...

Counting bacteria?
100000/10ml = 10000/Xml





10000 = 100000X





1 =Xml





Which means you would dilute down to 1ml to have 10000 bacteria. Then you would use a hemocytometer or Coulter counter to count the bacteria.


Can bacteria do photosynthesis?

If so, what is different about how they do photosynthesis from how plants do photosynthesis?

Can bacteria do photosynthesis?
some bacteria can do photosynthesis


the first photosynthetic organisms were actually bacteria


we should thank the oxygen we breathe today to them





i am not sure they have a difference.
Reply:Depends on the bacteria; most are decomposers without chloroplasts.
Reply:only the ones with chloroplasts
Reply:yes they can, it is not different.
Reply:yes cynobacteria can do photosynthesis and they are wrongly called as blue green algae due to their this property.


they have chloroplast in their cells.
Reply:Photosynthetic bacteria do not have chloroplasts (or any membrane-bound organelles). Instead, photosynthesis takes place directly within the cell. Cyanobacteria contain thylakoid membranes very similar to those in chloroplasts and are the only prokaryotes that perform oxygen-generating photosynthesis. In fact chloroplasts are now considered to have evolved from an endosymbiotic bacterium, which was also an ancestor of and later gave rise to cyanobacterium. The other photosynthetic bacteria have a variety of different pigments, called bacteriochlorophylls, and do not produce oxygen. Some bacteria, such as Chromatium, oxidize hydrogen sulfide instead of water for photosynthesis, producing sulfur as waste.





The above text was taken from wikipedia link below. The third link is a very good source as well, contains nice videos of bacterial photosynthesis.


Some bacteria that are adapted to live without oxygen combine carbon dioxide and hydrogen to produce?

A)lactic acid


B)methane


C)pyruvic acid


D)glucose

Some bacteria that are adapted to live without oxygen combine carbon dioxide and hydrogen to produce?
Methane
Reply:Methane is the correct answer. A good example of anaerobes (organisms that live without Oxygen) would be a waste water treatment plant. After the waste goes through the anaerobic digester the methane gas that is produced is either burned off at a smoke stack or captured and shipped off as a byproduct of the process.

frangipni

Can bacteria survive at 60 degrees or more? Why?

Just answer yes or no to the first question and reason to the second question. Thanks!!!

Can bacteria survive at 60 degrees or more? Why?
Yes.





There are bacteria that can survive in almost any conditions. They've adapted to their surroundings. Some bacteria thrive in temperatures over 100 F.
Reply:Yes. However you should have stated whether or not we were talking about Celsius or Fahrenheit. There is a big difference.





Bacteria are found virtually everywhere on the planet, including in deep thermal vents located on the bottom of the ocean. Temperatures there can exceed 500 deg C from the vents, yet life exists in them.





Now here is where your question gets tricky. Some bacteria are able to produce spores when they sense that they are in a condition where survival is not optimal. These spores have hard Calcium based outer membranes and can easily survive in temperatures above 100deg C and when conditions are right, the spores will begin to germinate, and become full blown bacteria again.





Hope this helps.
Reply:if 60 degrees farenheit, yes.


most bacteria live very well especially when at body temperature, 98.6 degrees farenheit.


A bacteria population doubles in 20hours. when was the population 1/8 of its present population?

(present population) = (original population)2^(t / (doubling time))





(1 / 8)(original population) = (original population)2^(t / 20)





1 / 8 = 2^(t / 20)





LN(1 / 8) = LN[2^(t / 20)]





LN(1 / 8) = (t / 20)(LN(2))





LN(1 / 8) / LN(2) = t / 20





20LN(1 / 8) / LN(2) = t





20LN(2^(-3)) / LN (2) = t





3(-20)LN(2) / LN(2) = t





-60 = t





Answer: The poopulation was 1 / 8 of the original size 60 hours ago

A bacteria population doubles in 20hours. when was the population 1/8 of its present population?
20 hours ago 1/2 of current population


40 h ago ago 1/4


60 h ago 1/8


so 60 hours ago it was 1/8 of the current population.
Reply:Three doublings ago--that is to say, 60 hours, or 2 1/2 days.
Reply:Growth equation: P = Pe^(rt)





2 = e^(r*20)


ln2 = 0.693 = 20r; r = (ln2)/20





P/8 = Pe^(ln2*t/20)


ln(1/8) = ln2*t/20


-ln8/ln2*20 = t


t = -60 hours, in other words 60 hours ago.





A shortcut to this is to use P.f/P.i = 2^(t/20)


1/8 = 2^(t/20)


-3 = t/20


t= -60 hours
Reply:60 hours ago.





1/2 20 hours ago


1/4 40 hours ago


1/8 60 hours ago
Reply:Present population = P





We're looking for 1/8th of X.





P = X


1/2P = X/2


1/2(1/2P) = X/4


1/2(1/2(1/2P)) = X/8


^ ....^......^





That's three doublings. Three doublings takes 60 hours.


What bacteria causes swimmer's ear?

just wondering...

What bacteria causes swimmer's ear?
There are different types of bacteria that cause swimmer's ear (Otitis Externa).





It's caused by the streptococcus, staphylococcus, or pseudomonas types of bacteria.
Reply:Pseudomonas aeruginosa is the main culprit, although other bacteria can cause it as well.
Reply:I think there is quite a few..





The only ones i know of are..





Pseudomonas aeruginosa and Staphylococcus aureus








%26amp;%26amp; just incase you were wondering the fungal pathogens responsible are Candida albicans and Aspergillus





:D Hope That Helped!
Reply:Hey





Swimmer's Ear is usually caused by an infection with the Pseudomonas aeruginosa or Staphylococcus aureus bacteria.





When your ear is exposed to excess moisture, however, water can remain trapped in your ear canal. The skin inside becomes soggy, diluting the acidity that normally prevents infection. A cut in the lining of the ear canal also can allow bacteria to penetrate your skin. When this happens, bacteria and fungi from contaminated water or from objects placed in your ear can grow and cause a condition called swimmer's ear (acute otitis externa, or external otitis).





You can often prevent Swimmer's Ear by keeping water out of your ears.Pools that are poorly maintained are more likely to spread Swimmer's Ear. Swimmer's Ear can be treated with prescription antibiotic drops, either with or without steroids. Oral antibiotics are rarely needed to treat uncomplicated cases of Swimmer's Ear.





Malignant otitis externa is a rare complication of Swimmer's Ear. Fungal infections and noninfectious disorders, including eczema, psoriasis, seborrheic dermatitis, and allergic contact dermatitis, can also cause otitis externa, and should be suspected in chronic cases of Swimmer's Ear.





Hope that helps


If bacteria are considered as prokaryotes, and human cells are eukaryotes, what kind of cell is a virus?..?

see, prokaryotes have no TRUE nucleus and no membrane-bound organelles, right? and eukaryotic cells have otherwise. my teacher asked us what classification of a cell does a virus belong to..he mentioned akaryotes (no nucleus, as in erythrocytes)... and i can't think of the answer. are there other type of cells aside from the famous PROKARYOTIC and EUKARYOTIC cells? where do viruses belong to?...

If bacteria are considered as prokaryotes, and human cells are eukaryotes, what kind of cell is a virus?..?
Viruses are not cells, because they do not have the requisite parts (no real membrane, just a protein coat, and no organelles. Just a lump of DNA or RNA, with a protein coat and a few surface proteins that allow it to attach and penetrate target cells) They don't even really fit anywhere on the current Linnean classification system for life -- they can be argued by some to not really be alive at all, since they are incapable of reproducing without external help, do not consume nutrients or excrete anything, and are not technically capable of any stimulus response -- they react to their environment in the same way a chemical does when it contacts the right reagent.





By the way, there is a third cell variety besides the prokaryotes and eukaryotes -- the archaea. These critters are structurally like bacteria, placing them partly in the prokaryotic camp, except that instead of the peptidoglycan that makes a cell a prokaryote, archaea use a different (albeit similar) protein. They also possess organells that make them more similar to eukaryotes, so they're sort of tangential to both eukaryotes and prokaryotes. And viruses don't belong to the archaea, either.
Reply:from wht i remb from biology 2 years ago, virus is not a living thing...so i guess...sry...i really don't kno
Reply:A virus is not a cell because it can't live without a host.
Reply:Viruses aren't really cells at all, they just depend on high jacking cells in order to replicate. They're classed separate from all the other life forms (including Eukayotic, Porkaryotic; and Archea), and some argue about classifying them as life at all (although this gets into semantics and philosophy). Check out the link below for some information.
Reply:always check the wiki





http://en.wikipedia.org/wiki/Virus
Reply:Viron: transmissible state of a virus. These structures contain a nucleic acid core wrapped in a protein coat. This coat is called a capsid. Some virons contain an envelope, constructed from the host cell membrane. The nucleic acid core may be DNA ( double strand, single strand), or RNA ( single strand, double strand), but never both. The shape of these virons vary from spherical, cylindrical, bullet-shaped , to amorphous shaped particles. They vary in diameter from 18 to 300 nm. Virons must infect a living cell. Viruses are obligate intracellular parasites. Some virons are hardier than others ( hepatitis virus can withstand short periods of boiling; most virons are destroyed by this).





Viral Replication: most viruses carry the enzyme RNA replicase to make complementary RNA strands. Some viruses contain the enzyme reverse transcriptase, which produces DNA , then RNA. These are called retro viruses. HIV is an eample of a retro virus. The three basic patterns of genome replication are: DNA---%26gt;DNA, RNA----%26gt;RNA, and RNA-------%26gt;DNA----%26gt;RNA. Viral components are held together by weak bond (van der Waals forces and hydrogen bonds).


Host Specificity: Each type of virus can infect and parasitize a limited range of host cells. They are guided by external recognition areas of the host cell. This may keep a virus from infecting many different types of cells.





Lytic Cycle: Life cycle of virulent phages.





1. The phage lands on the host cell, and using 140 ATP's in its tail fibers, injects its nucleic acid core into the bacterium.





2. The host's DNA is cut up and destroyed by the enzymes produced by the host from the new DNA.





3. The now unassembled nucleotides are reassembles into phage DNA, which produces copies of the capsid.





4. The genes also produce the enzyme lysozyme, that digests the bacterial cell wall, causing the newly assembled viruses to escape.





Lysogenic Cycle: Viruses that reproduce without killing their hosts are called temperate viruses. These viruses have 2 alternate forms of reproduction. The lytic cycle or the lysogenic cycle. The process begins very similar to the lytic infection or inserting the genome into the host's genome and becoming dormant. During the lysogenic cycle one of the temperate phage's genes remains active. It codes for a repressor protein keeping the prophage genes inactive. From here on the cells reproduce regularly. Each carrying the hidden genes of the virus. Under normal circumstances harmless bacteria remain so until infected by these viruses; then they can become pathogenic. Example Botulism, diphtheria, and scarlet fever bacteria.





Diseases caused by viruses: small pox, chicken pox, cold sores, herpes, Rubella, yellow fever, AIDS, rabies, mumps, influenza, measles,and some forms of cancer.
Reply:viruses are not considered as cells, they are particles containing RNA and protein....

bleeding heart

Is bacteria bigger than viruses?

Yes. Bacteria are considerably larger than viruses.





But, there are many differences between the two other than size.





One major difference between viruses and bacteria is the method of reproduction. Bacteria are completely self-contained and self-reproducing organisms.





A virus, on the other hand, cannot reproduce without a living host.

Is bacteria bigger than viruses?
yes, much bigger
Reply:YUPPPPP ☺
Reply:Usually. The largest viruses are bigger than the smallest bacteria, but the average bacteria is much larger than any virus.


Do bacteria have introns?

They're called group II introns, and everybody above is right but wrong, no introns are found in highly conserved genes, but they can be found in other parts of the genome.





Read on:





Where are group II introns found?





Mitochondria and chloroplasts...








Bacteria





In bacteria, about one quarter of genomes contain group II introns, and the bacterial introns differ in several respects from the organellar group II introns. The bacterial introns are not located in conserved genes, but instead are located in mobile DNAs such as plasmids, IS elements or pathogenicity islands. The introns are often inserted outside of ORFs, and almost all introns identified so far encode reverse transcriptase ORFs and are either active retroelements or derivatives of retroelements. For these and additional reasons (see Dai and Zimmerly, 2002) we have proposed that group II introns in bacteria behave mainly as retroelements, a significant difference from organellar group II introns.





Archaebacteria





One recent exciting discovery is that group II introns are present in archaebacteria, where they are found in three Methanosarcina species. These archael introns are closely related to group II introns in eubacteria, but there are differences in their insertion patterns. None of the archael introns are located in cellular genes, but are instead inserted into other introns, forming “twintrons” with up to four sets of nested introns. Moreover, a number of the introns do not encode RT ORFs but seem to be mobile nevertheless. (See Dai %26amp; Zimmerly 2003 for detailed information)

Do bacteria have introns?
I don't think so
Reply:No, I believe that, in general, only eurkaryotic cells have introns. I say "in gereral" because I wouldn't be surprised if they have found some bacterial species which has demonstrated intron-like behavior in some of their DNA.


**********


Revising my answer to YES!!


As I suspected, there has been recent evidence of Group II introns in bacteria - check the source link.


**********


In response to frederickman...


Bacteria do not have mitochondria nor chloroplasts. They do, however, have introns as described in the Nature article below. They may not be associated with conservative genes like Eukaryotic cells, but the answer to this thread is unequivocally "YES", bacteria do have introns.
Reply:NO.
Reply:No- bacteria respond to environmental conditions to express genes. For example, if lactose isn't in the environment, the bacterium won't waste energy expressing an enzyme to break down lactose. They use a system of operons and repressors.
Reply:nope
Reply:Interesting question. I would say that when a virus inserts genetic instructions into a bacterial genome you may be able to call that intronic, but generally, bacterial genomes are highly conserved, having not the room or energy for intronic space.
Reply:While there are distant exceptions to the basic answer (as there always are), for all intensive purposes: No. Bacterial DNA does not contain introns and thus no splicing is necessary after transcription/before translation of mRNA.


Are bacteria plants? Fungi?

My book says they are not. my brother's book says they are Thallophyta i.e plants???????

Are bacteria plants? Fungi?
Bacteria are procaryotes. Their cell structure is different from those of plants and animals (Eucaryotes) they are in their own category altogether. Years and years ago they were categorized as plants. Some of them have clorophyll. How old is your brother's science book?
Reply:bacteria are Bacteria.
Reply:I don't think they are plants.
Reply:not plants.. i m sure
Reply:yes.
Reply:Bacteria are single celled organisms whereas plants , animals are multicellular organisms... so bacteria are different organisms than fungi or plants or animals....hope that answers ur question..hehe..njoy
Reply:"Kaplah" who answered above is correct!, bacterias are not plants, now!
Reply:no they are not...ur teacher probably means that some bacteria can produce their own food with chlorophyll but there are other properties that make it not a plant
Reply:yes some are it depends what plant it is
Reply:Bactria have no definite nucleus, most have no chlorophyll,no organelles, only one chromosome .they reproduce asexually.


Fungi have no chlorophyll at all i.e. they are heterotrophic .They secret extracellular enzymes for digestion, they have true nucleus they reproduce mostly by spores(asexual).


Plants have nucleus with more chromosomes,have organelles %26amp;chlorophyll for photosynthesis.they reproduce sexually to form seeds.


SO,FUNGI %26amp; BACTERIA ARE NOT TO BE GROUPED WITH PLANTS
Reply:There have been many classifcation systems taught in schools over the years. The most recent of which - 5 kingdoms - is now defunct, and has not been used by scientists for years. The system now used has three domains - Archea, Eukarya and Prokaryae. Plants and fungi belong to the Eukaryae domain, defined by the nucleus and the 16s Ribosomal subunit. Bacteria belong to either the Archeae or the Prokaryae. All archea are bacteria (not capital B), but not all bacteria are archae.





The book of which you speak is very out of date. It probably dates back to a time when organisms were classified by metabolism .


The bacteria Lactobacillus acidophilus?

What are the obvious adaptations of the organism to its environment?

The bacteria Lactobacillus acidophilus?
Looking at its name will give you some hints: the lacto and and the acidophilus. Acidophilus is because it has adapted to grow in an acidic environment (acid-loving). Lacto because it can metabolize lactose as its carbon source (it is anaerobic).

street fighting

How bacteria avoid hexose stage to produce pyruvate?

what

How bacteria avoid hexose stage to produce pyruvate?
Are you making organic wine, or cheating on your microbiology homework? Google, man. It's probably going to be more fruitful for you in this case. People on Yahoo are generally yahoos. Present company excepted, of course.





Best of luck, sugar.


Is bacteria a plant or an animal?

Bacteria is neither plant nor animal.





Plants are in Kingdom Plantae.


Animals are in Kingdom Animalia.





In a five-kingdom classification system, bacteria are in Kingdom Monera.





In a six-kingdom system, bacteria are in Kingdom Eubacteria and Kingdom Archaebacteria.





Bacteria are not plants mainly because bacteria are prokaryotic -- no nuclei or membrane-bound organelles inside their cells.

Is bacteria a plant or an animal?
Neither
Reply:bacteria is neither a plant nor animal.
Reply:neither.


you see living organisms are divided into groups


and bacteria has a group of its own.
Reply:very small living things (related to plants), some of which cause disease. they exist in water, soil, air, plants and the bodies of men and animals.
Reply:bacteria is neither plant nor animal
Reply:bacteria is neither a plant nor animal . it belongs to, the kingdom MONERA a kingdom created specially for bacteria like organisms
Reply:neither.
Reply:Bacteria are neither plant nor animal, they have a classification of their own. Although some bacteria are photosynthetic and some are chemosynthetic, making food on their own. Many do have cell walls.Some can not exist on their own, but only in a host.
Reply:Animal. It does not have a cell wall, just a cell membrane. There are other things too, but this is a good example of one reason.
Reply:its an animal


What is the role of bacteria in causing disease? also, What is bacteria (types of cells,domains,kingdoms)?

Bacteria can be pathogenic, or infectious, as parasites feeding off of the host's nutrients. Many of our symptoms of disease are caused by exotoxins, which bacteria release. Bacteria are prokaryotic cells, and currently make up the two kingdoms of Archaea and Eubacteria.

What is the role of bacteria in causing disease? also, What is bacteria (types of cells,domains,kingdoms)?
do your own homework
Reply:bacteria cause disease by producing toxins or damage cells.


there are many types of bacteria.


Some bacteria resemble viruses in that they...?

a) perform photosynthesis


b) are obligate intracellular parasites


c) are aerobic


d) employ RNA as the genetic material

Some bacteria resemble viruses in that they...?
The answer is B. No viruses can phtosynthesize as stated before, not all viruses and bacteria rely on gases and bacteria have DNA.





Some bacteria are of course harmful to us (ex. anthrax) while others are actually very beneficial to us like the bacteria that speed up digestion in our stomachs. Therefore not all bacteria are helpful and not all are harmful whereas all viruses invade cells. This would leave you with the answer as B.
Reply:hmm...(A) would be false because i'm quite sure viruses cannot photosynthesize. (C) is also false because viruses cannot be classified as aerobic or anaerobic. so were left with either (B) or (D) hmmm....i'd go for (B). just a hunch
Reply:The answer is definitely B. All viruses are obligate intracellular parasites, but only some bacteria are. This means that they can't reproduce on their own. They need a host cell to help them carry out reproduction.
Reply:B is the answer your teacher wants.

grappling

Which bacteria is present in curd ?can u give me its features?

By curd, I assume cheese curd? If so this is lactic acid bacteria, lactobacilllus species. It grows at lower pH and digests milk proteins with its enzymes.


What is the role of bacteria in causing disease? also, What is bacteria (types of cells,domains,kingdoms)?

Bacteria classification:


-Kingdom - Monera


-Phyla -


Actinobacteria


Aquificae


Chlamydiae


Bacteroidetes/Chlorobi


Chloroflexi


Chrysiogenetes


Cyanobacteria


Deferribacteres


Deinococcus-Thermus


Dictyoglomi


Fibrobacteres/Acidobacteria


Firmicutes


Fusobacteria


Gemmatimonadetes


Lentisphaerae


Nitrospirae


Planctomycetes


Proteobacteria


Spirochaetes


Thermodesulfobacteria


Thermomicrobia


Thermotogae


Verrucomicrobia





Role in disease:


Although the vast majority of these bacteria are rendered harmless or beneficial by the protective effects of the immune system, a few pathogenic bacteria cause infectious diseases, including cholera, syphilis, anthrax, leprosy and bubonic plague.


Vagina Bacteria?

I just have this bad smell with some yellow color in my private area? Should I use feminine wash? I never tried anything before. I'm married 7 months ago. My husband uses condoms and we can't have sex smoothly without KY is this bad smell because of KY maybe? Please tell me what to do?

Vagina Bacteria?
Don't use a feminine wash. That isn't going to help at all especially if it is an infection. Go to the drugstore and pick up Monistat. It's for infections. There are a couple versions of it. One day, 3 day and 7. If you still have problems after using that then make an appointment with you GYN. I doubt that it's the KY. If you feel "dirty" use a feminine cleansing cloth after intercourse, or take a soak in the tub. Douching isn't good to use. It messes up the pH levels in the vagina which can cause more irritation. Plus, it could mess with pap test results if you use if before doctor appointment.
Reply:wow well go see your OB/GYN and they can tell you what it is and what to do for it. Sorry you're having this problem.
Reply:Could be normal for you. Everyone is different. Use wet personal wipes often. I don't think anything else will help.
Reply:You could have a condition called vaginitis or a bacterial infection. It is not an STD rather it is an overgrowth of certain types of good bacteria that naturally exist in the vagina. Some types of creams can affect this balance but its not too much to worry about. Visit you doctor she can prescribe you a cream or pills that will correct this balance. She can also just double check you for STDS. Wiping the area with feminine cleansing cloths after intercourse can help in the mean time.
Reply:Don't ever EVER use a feminine wash or any type of feminine deodorant. Don't ever douche.





The vagina is a self-cleaning organ. However, if your natural smell has changed or if you have a colored discharge of any type, SEE YOUR DOCTOR NOW. This can only be bad news, although it's rarely really, really bad news.





A combination such as the one above is generally a sign of some type of infection. This does not mean that one of you has cheated though, so don't be suspicious of your husband. There are vaginal infections that are not always sexually transmitted. However, the two of you should be treated for whatever this may be.





BTW, it's not unusual for a partner to be the first one to notice a vaginal infection, simply because infection changes your smells And a yellow discharge is not a yeast infection. That's white and a bit chunky, similar to cottage cheese.


Do bacteria have introns?

They're called group II introns, and everybody above is right but wrong, no introns are found in highly conserved genes, but they can be found in other parts of the genome.





Read on:





Where are group II introns found?





Mitochondria and chloroplasts...








Bacteria





In bacteria, about one quarter of genomes contain group II introns, and the bacterial introns differ in several respects from the organellar group II introns. The bacterial introns are not located in conserved genes, but instead are located in mobile DNAs such as plasmids, IS elements or pathogenicity islands. The introns are often inserted outside of ORFs, and almost all introns identified so far encode reverse transcriptase ORFs and are either active retroelements or derivatives of retroelements. For these and additional reasons (see Dai and Zimmerly, 2002) we have proposed that group II introns in bacteria behave mainly as retroelements, a significant difference from organellar group II introns.





Archaebacteria





One recent exciting discovery is that group II introns are present in archaebacteria, where they are found in three Methanosarcina species. These archael introns are closely related to group II introns in eubacteria, but there are differences in their insertion patterns. None of the archael introns are located in cellular genes, but are instead inserted into other introns, forming “twintrons” with up to four sets of nested introns. Moreover, a number of the introns do not encode RT ORFs but seem to be mobile nevertheless. (See Dai %26amp; Zimmerly 2003 for detailed information)

Do bacteria have introns?
I don't think so
Reply:No, I believe that, in general, only eurkaryotic cells have introns. I say "in gereral" because I wouldn't be surprised if they have found some bacterial species which has demonstrated intron-like behavior in some of their DNA.


**********


Revising my answer to YES!!


As I suspected, there has been recent evidence of Group II introns in bacteria - check the source link.


**********


In response to frederickman...


Bacteria do not have mitochondria nor chloroplasts. They do, however, have introns as described in the Nature article below. They may not be associated with conservative genes like Eukaryotic cells, but the answer to this thread is unequivocally "YES", bacteria do have introns.
Reply:NO.
Reply:No- bacteria respond to environmental conditions to express genes. For example, if lactose isn't in the environment, the bacterium won't waste energy expressing an enzyme to break down lactose. They use a system of operons and repressors.
Reply:nope
Reply:Interesting question. I would say that when a virus inserts genetic instructions into a bacterial genome you may be able to call that intronic, but generally, bacterial genomes are highly conserved, having not the room or energy for intronic space.
Reply:While there are distant exceptions to the basic answer (as there always are), for all intensive purposes: No. Bacterial DNA does not contain introns and thus no splicing is necessary after transcription/before translation of mRNA.

yoga

What is the role of bacteria in causing disease? also, What is bacteria (types of cells,domains,kingdoms)?

Bacteria can be pathogenic, or infectious, as parasites feeding off of the host's nutrients. Many of our symptoms of disease are caused by exotoxins, which bacteria release. Bacteria are prokaryotic cells, and currently make up the two kingdoms of Archaea and Eubacteria.

What is the role of bacteria in causing disease? also, What is bacteria (types of cells,domains,kingdoms)?
do your own homework
Reply:bacteria cause disease by producing toxins or damage cells.


there are many types of bacteria.


Are bacteria living?

yes, of course they are! Bacteria are microscopic organisms whose single cells have neither a membrane-bounded nucleus nor other membrane-bounded organelles like mitochondria and chloroplasts. Another group of microbes, the archaea, meet these criteria but are so different from the bacteria in other ways that they must have had a long, independent evolutionary history since close to the dawn of life. Bacteria are among the oldest living organisms on Earth, and are very small. Because the bacteria structure is so minute, it can only be seen through a microscope. Bacteria is commonly found in the ground, water and in other living organisms. While some types of bacteria can cause diseases and become harmful to the environment, animals and humans, others offer benefits that we likely could not live without.





for more information, check out these cool websites below and DO NOT USE WIKIPEDIA[my suggestion~they usually have fake info, but its mainly up to you if you wanna use it or not] and good luck! ♥

Are bacteria living?
they meet the requirements of living...MRSGREN, movement, respiration, sensitivity, growth, reproduction, excretion and nutrition.





Viruses are a different story however
Reply:Yes, bacteria do meet all requirements for the currently accepted definition if life.





Virus, however, are not universally accepted as such.
Reply:Yes! Bacteria are living! They are a living thing and has a kingdom of its own.Bacteria can cause sickness and also can treat symptoms. Here is some tibits about bacteria. Good Luck![=





Bacteria (singular: bacterium) are unicellular microorganisms. They are typically a few micrometres long and have many shapes including spheres, rods, and spirals. The study of bacteria is bacteriology, a branch of microbiology. Bacteria are ubiquitous in every habitat on Earth, growing in soil, acidic hot springs, radioactive waste,[1] seawater, and deep in the earth's crust. Some bacteria can even survive in the extreme cold and vacuum of outer space. There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water; in all, there are approximately five nonillion (5×1030) bacteria in the world.[2] Bacteria are vital in recycling nutrients, and many important steps in nutrient cycles depend on bacteria, such as the fixation of nitrogen from the atmosphere. However, most of these bacteria have not been characterised, and only about half of the phyla of bacteria have species that can be cultured in the laboratory.[3]
Reply:Yes they are. They vast majority of them are not harmful. They are a unicellular microorganism, in other words a really small one cell "animal" that can only be seen under a microscope. Although they are living, it is the one area of science that doesn't have a group that complains about killing them (if there were, it would be a lot harder to find and purchase non bacterial hand soap).
Reply:yes....

ivy

What is the role of bacteria in causing disease? also, What is bacteria (types of cells,domains,kingdoms)?

Bacteria classification:


-Kingdom - Monera


-Phyla -


Actinobacteria


Aquificae


Chlamydiae


Bacteroidetes/Chlorobi


Chloroflexi


Chrysiogenetes


Cyanobacteria


Deferribacteres


Deinococcus-Thermus


Dictyoglomi


Fibrobacteres/Acidobacteria


Firmicutes


Fusobacteria


Gemmatimonadetes


Lentisphaerae


Nitrospirae


Planctomycetes


Proteobacteria


Spirochaetes


Thermodesulfobacteria


Thermomicrobia


Thermotogae


Verrucomicrobia





Role in disease:


Although the vast majority of these bacteria are rendered harmless or beneficial by the protective effects of the immune system, a few pathogenic bacteria cause infectious diseases, including cholera, syphilis, anthrax, leprosy and bubonic plague.


Does bacteria live on a bar of soap?

I know some soaps claim to kill 99.9% of germs when you wash your hands with them. But if you leave a bar of soap in the bathroom where germs are everywhere..does that mean they cant live on the soap? I've always wondered about this....

Does bacteria live on a bar of soap?
Yes, bacteria live EVERYWHERE. When I was in high school (back when dirt was fresh, and dinosaurs roamed the earth...), we took swabs of all sorts of surfaces in the school - including bars of soap, water fountains, door handles, desk tops - you get the idea - and cultured the bacteria we found. Bars of soap that had been used for hand-washing were among the WORST offenders in terms of bacteria. That doesn't mean to quit washing your hands - it just means that using LOTS of soap, and allowing the suds and the hot water to do their work is important.
Reply:I just read that soaps are anti-germicidal by nature and not just the antibacterial soaps.
Reply:wash your hands, especially before eating and after using the bathroom, and insist that those around you do the same!


use paper towels rather than cloth towels for drying your hands/face because germs can liveon a soggy towel


use liquid (antibacterial) soap rather than bar soap because germs can live on a bar of soap


don't share utensils, cups or dishes with someone else


don't share pillows with someone who has a cold/flu


when out in public places try not to touch counter tops, railings, doors, etc... because you could pick up someone else's germs
Reply:thet do live on it untill it's mixed with water then the DIE
Reply:hhmm now thats a thought..yeah..now Im curious..if just soap can not wash away mildew..does that mean that mildew can not be washed away from soap ..and what about for those who have genital issues.. Can you get an STD if you use the same bar of soap, but then again the layers of the soap do get washed away quickly..ok Im just bored and rambling on...but if you know please enlighten me =)
Reply:not antibacterial soap
Reply:hunny everything has bacteria, nothing is bacteria free


Why test water for coliform bacteria rather than for pathogenic bacteria which maybe present?

It's much easier to test for coliform bacteria and the test is considered presumptive. That is, if coliform bacteria are present, pathogenic bacteria MAY be present. So absence of the more general bacteria will suffice to prove absence of the pathogenic bacteria.

Why test water for coliform bacteria rather than for pathogenic bacteria which maybe present?
Coliform is the common bacteria found in human waste. Testing waters for that will see if there are elevated levels greater than what in naturally present. If there is a concern of higher level of pathogenic bacteria, such as "red tide", then that would/should be tested for.
Reply:as it has already been said, it is easy to test the coliform count, and with that an assumption can be made about the presence of pathogenic microorganisms. other than that, coliform survives in the same conditions as most pathogenic bacteria, so the presence of coliform in a tested water suggests that a pathogenic bacteria can survive as well. and there are multitude of pathogenic bacteria out there, each with unique tests for their presence, so it takes a longer time to test for the pathogens. so coliform testing is both easy and fast way of identifying the presence of pathogens in water.hope this helps...


What bacteria survive best under UV light?

In addition to endospores surviving, the cells that don't make it can be repaired by natural light exposure. This is because UV light exposure causes some wierd bonds to form in the DNA. Exposure to natural light can repair some of these damaged cells.

What bacteria survive best under UV light?
As far as I know there is no bacteria that can survive UV Radiation.


About the only thing I can think of that might survive are Bacterial Spores, such as the spores that are associated with Anthrax.
Reply:The greatest resistance to UV radiation, as with most environmental factors that kill bacteria, is the ability to form endospores. Spore-forming bacteria such as Bacillus are able to survive much higher doses of UV and other types of radiation. Spores can survive very harsh conditions (high/low temperature, low water, radiation, antibiotics, osmotic pressure, etc.) for extended periods of time before becoming active again when conditions improve.





Each individual organism has a inactivation curve based on amount and wavelength of UV radiation over time. Some information can be found by searching "UV inactivation curves", especially if you are looking for a particular organism. The environment of the organism also alters the amount of radiation required to inactivate (water or other fluid, embedded in meats, on surfaces, etc.).





Hope this is helpful.

fuchsia

Do bacteria and prokaryotes undergo meiosis?

Meiosis is a necessary step to ensure that the number of chromosomes is correct in organisms that reproduce sexually.


If it didn't occur, then every time two gametes fused the genetic material would double.





Bacteria and prokaryotes multiply by binary fission; the cell grows, DNA replicates and then the "big" cell divides into two cells of "normal" size. There is no need for meiosis.

Do bacteria and prokaryotes undergo meiosis?
You're welcome. Glad to help. Report It

Reply:meiosis?


I don't think so.. I looked up the biology textbook and it said they undergo asexual reproduction
Reply:They do not have a well organized nuleus.Their nuleus like structure is known as nucleoid.Crossing over of chromosomes ,chromosmal interchange are not posible becuase of their primitive nucleus .They unergo asexual repoduction.Prokaryotes undergo amitosis----------.bacteria undergo fission-----
Reply:no dear, I'm damn sure they do not undergo meiosis %26amp; not even mitosis
Reply:They undergo binary fission which is a simple cell division and the DNA replicates itself


Which bacteria r deadly to humans?

from where do they come from

Which bacteria r deadly to humans?
☻"E.coli" was first identified in food in 1980, and sporadic outbreaks have become increasingly more frequent.





☻"Anthrax" most commonly occurs in wild and domestic lower vertebrates (cattle, sheep, goats, camels, antelopes, and other herbivores), but it can also occur in humans when they are exposed to infected animals or tissue from infected animals.





%26lt;*-*%26gt;
Reply:Thanks! %26lt;*-*%26gt; Report It

Reply:The list wouldn't fit here. You would volumes and volumes of medical books.





Bacteria come from other bacteria. Some evolve into different strains
Reply:They are all potentially deadly for someone whose immune system is seriously compromised. It also depends on which organ is affected.
Reply:There's E-Coli. But there are some others.


If it looks like a bacteria, and moves like a bacteria, then it must be a _________ ?

Prokaryotic cell. This could be a trick question as some, but very few eukaryotic cells act like a bacteria (prokaryotic cell).

If it looks like a bacteria, and moves like a bacteria, then it must be a _________ ?
some type of a unicellular organism. Most likely bacteria.
Reply:BACTERIA.....i think


is that a BIO question or a philosophy one....
Reply:bacteria, I suppose.
Reply:Taco?
Reply:lawyer.
Reply:Yeast?





Nucleated virus?





Dinner. Yep that must be the right answer, dinner.





Well, unless it actually is a bacteria.
Reply:a bacteria
Reply:Herpes
Reply:unicellular organism.
Reply:a different form of a bacteria orgasm that can grow anywhere and cause alot of medical problems...you know what i mean


Friday, July 23, 2010

Can bacteria vaginosis cause your period to be late?

What is Bacterial Vaginosis?





Bacterial vaginosis is the most common vaginal condition in women. It is caused by an excess growth of bacteria normally present in the vagina. The vagina normally contains many kinds of bacteria that keep the vagina healthy. When the acidity of the vagina changes, these bacteria can overgrow, thus causing bacterial vaginosis. The acidity of the vagina can be changed by menstruation (the woman's period), sexual intercourse, douching, antibiotics or the presence of other sexually transmitted diseases.





Who gets bacterial vaginosis?


Bacterial vaginosis usually affects women between 15-44 years of age. It may occasionally occur in younger girls and older women. It most often occurs in sexually active women.





How is bacterial vaginosis spread?


Sexually active women have bacterial vaginosis more often than women who are not. It is unclear, however, if bacterial vaginosis is sexually transmitted. The infection has a tendency to occur again even when the partner has been treated.





What are the symptoms of bacterial vaginosis?


A vaginal discharge is a common symptom. There is often a foul or fishy odor, especially after having intercourse. Occasionally, there may be itching.





What complications can result from bacterial vaginosis?


There is some concern that bacterial vaginosis may be involved in some cases of infections of the uterus (womb) especially after vaginal delivery. However, more research is needed to clarify these issues.





Does past infection make a person immune?


No. Bacterial vaginosis can occur whether the woman is sexually active or not and whether the partner is treated or not.





What is the treatment for bacterial vaginosis?


Antibiotics given by mouth is the preferred treatment. A vaginal cream, different than the one given for yeast infections, is also available.





What should I do if I have symptoms of bacterial vaginosis?


Avoid sexual intercourse and contact your doctor or an STD clinic. You should be examined so the right diagnosis can be made and treatment given.





What can be done to prevent the spread of STDs?





Abstinence is the only sure way to avoid STDs.


The kinds of sex that do not include vaginal, anal or oral intercourse are also "safer sex" and less likely to spread STDs.


Try to limit your exposure to STDs. Unprotected sexual activity increases your chance of exposure and infection. If you have more than one partner or your partner has other sexual partners this increases your chances of getting an STD.


Use barrier protection, like a condom.


Look at your partner before having sex. If you see any sign of an infection such as rashes, sores, discharge or swelling, stop and talk about the importance of checking for an STD before having sex.


If you think you are infected, avoid any sexual contact and visit a local sexually transmitted disease (STD) clinic, hospital or your own doctor. If possible, bring your sex partner(s) with you so that they can be treated if necessary.

Can bacteria vaginosis cause your period to be late?
yes i think it can!
Reply:As a representative of all men of the world....I would like to respond by saying........EWhhhhhhhhhhhhhhhh!

paper bush

What bacteria survive best under UV light?

In addition to endospores surviving, the cells that don't make it can be repaired by natural light exposure. This is because UV light exposure causes some wierd bonds to form in the DNA. Exposure to natural light can repair some of these damaged cells.

What bacteria survive best under UV light?
As far as I know there is no bacteria that can survive UV Radiation.


About the only thing I can think of that might survive are Bacterial Spores, such as the spores that are associated with Anthrax.
Reply:The greatest resistance to UV radiation, as with most environmental factors that kill bacteria, is the ability to form endospores. Spore-forming bacteria such as Bacillus are able to survive much higher doses of UV and other types of radiation. Spores can survive very harsh conditions (high/low temperature, low water, radiation, antibiotics, osmotic pressure, etc.) for extended periods of time before becoming active again when conditions improve.





Each individual organism has a inactivation curve based on amount and wavelength of UV radiation over time. Some information can be found by searching "UV inactivation curves", especially if you are looking for a particular organism. The environment of the organism also alters the amount of radiation required to inactivate (water or other fluid, embedded in meats, on surfaces, etc.).





Hope this is helpful.


Can bacteria grow better in salt water or fresh water?

it is for a science project.

Can bacteria grow better in salt water or fresh water?
It really depends on the type of bacteria and the temperature of the water. Most species that prefer to live in a human's blood stream will like salt water over fresh. It is a lot more similar in chemical composition. But there are hundreds of water born disease that humans get from drinking contaminated fresh water. Most of these are also bacteria.
Reply:Bacteria grow better in salt water as fresh water is too clean for bacteria to grow.
Reply:They probably have their preferences.


Some may not thrive in salt water and another in fresh.


Which bacteria r deadly to humans?

from where do they come from

Which bacteria r deadly to humans?
☻"E.coli" was first identified in food in 1980, and sporadic outbreaks have become increasingly more frequent.





☻"Anthrax" most commonly occurs in wild and domestic lower vertebrates (cattle, sheep, goats, camels, antelopes, and other herbivores), but it can also occur in humans when they are exposed to infected animals or tissue from infected animals.





%26lt;*-*%26gt;
Reply:Thanks! %26lt;*-*%26gt; Report It

Reply:The list wouldn't fit here. You would volumes and volumes of medical books.





Bacteria come from other bacteria. Some evolve into different strains
Reply:They are all potentially deadly for someone whose immune system is seriously compromised. It also depends on which organ is affected.
Reply:There's E-Coli. But there are some others.


Can bacteria kill a whale?

Sure it can. A bactrerial infection can spread to vital organs like the brain and heart. If the brain dies, the whale dies.

Can bacteria kill a whale?
Yes and you too.
Reply:Yes, a serious enough infection will kill anything.
Reply:bacteria can kill anything living!
Reply:Hi my names pea and im 13,


and i say.... yes





bacteria (if harmfull) can kill anyone. but If it was the bacteria in yoguhurt (good bacteria) and you tipped yoguhurt on a whale ... um i dont think it would die.
Reply:bacteria is the type of an organism that has the tendency to decompose any type of organic material(except polymers)


when the bacteria have the tendency to create havoc inside the body animals by inflicting its ability to decompose, it definitely has the ability to kill the whale from within its own body as it does for we humans.....

daphne

Can bacteria found in bread be categorized into facultative anaerobes?

Nope, Because it is Not a Bacterium, a Yeast, but, if I Remember Correctly, Facultative.

Can bacteria found in bread be categorized into facultative anaerobes?
Not really....what you are probably thinking of is yeast, which is a fungus, which bakers will use to make the bread rise. Yeast is a facultative anaerobe, because it can live off anaerobic fermentation as well as aerobic respiration. While there are bound to be plenty of bacteria on the bread, you can't really tell anything about them.


How do cationic surfactants eliminate bacteria?

This is called opsonization. The bacteria and immune cells are both negatively charged, so if they were to come together, they would just repell each other. Cationic surfactants are, as their name implies, positively charged. So when these coat the bacterium, the negatively charged immune cells can now see it, and it is more able to eliminate it.

How do cationic surfactants eliminate bacteria?
The effect is not quite opsonization.





The exact mechanism is not known, but there are a few published papers on the subject:





1.Cationic peptides might kill bacteria by activating their autolytic enzymes causing bacteriolysis


http://bloodjournal.hematologylibrary.or...





2. This paper found that the cationic proteins inhibited oxygen uptake by bacterial cells and damaged the permeability barriers of cells.


http://www.pubmedcentral.nih.gov/article...


If the cells became permeable to everything, they would lose the high concentration of nutrients stored in their cytosol and would allow other antimicrobial compounds to enter their cells easier.


The worst disease caused by bacteria?

What is the worst disease in your opinion? (not including AIDS)

The worst disease caused by bacteria?
the flesh eating bacteria.
Reply:hepititus
Reply:Bacterial meningitis


Considering you can't identify bacteria from a Gram stain, why might a physician perform a gram stain on a

sample before prescribing an antibiotic?

Considering you can't identify bacteria from a Gram stain, why might a physician perform a gram stain on a
I would suggest licking it.
Reply:To identify which type of antibiotics to use. There are antibiotics that are gram specific and there are broad spectrum antibiotics that are effective against both gram negative and gram positive
Reply:To identify what antibiotic the bacterium is sensitive too.
Reply:The Gram Stain divides bacteria into two categories..%26gt;Gram Positive and Gram Negative.


Some antibiotics only kill Gram Positive organisms, and some only kill Gram Negative ones. Some antibiotics kill organisms in both classes, but only a limited number species.


A Gram Stain Test can be done MUCH more quickly than a Culture and Sensitivity. So, armed with a Gram stain, the doctor can start you on a course of an antibiotic DAYS before he knows what organism he is treating, with a reasonable chance of choosing an effective antibiotic. He can then continue or change your antibiotic when he gets the C%26amp;S back days later.
Reply:Gram positive bacteria are causative of certain infections and the fact is true for gram negative ones. Thus the physician will prescribe his treatment accordingly.

camellia

How is plasmid ut into bacteria?

recombinant dna plasmid

How is plasmid ut into bacteria?
by transformation.


We can mix the plasmid with the bacteria and heat shock (usually about 42 degrees) the bacteria so that the plasmid will be more permeable for plasmid to get into the bacterical cell.


What bacteria survive best under UV light?

In addition to endospores surviving, the cells that don't make it can be repaired by natural light exposure. This is because UV light exposure causes some wierd bonds to form in the DNA. Exposure to natural light can repair some of these damaged cells.

What bacteria survive best under UV light?
As far as I know there is no bacteria that can survive UV Radiation.


About the only thing I can think of that might survive are Bacterial Spores, such as the spores that are associated with Anthrax.
Reply:The greatest resistance to UV radiation, as with most environmental factors that kill bacteria, is the ability to form endospores. Spore-forming bacteria such as Bacillus are able to survive much higher doses of UV and other types of radiation. Spores can survive very harsh conditions (high/low temperature, low water, radiation, antibiotics, osmotic pressure, etc.) for extended periods of time before becoming active again when conditions improve.





Each individual organism has a inactivation curve based on amount and wavelength of UV radiation over time. Some information can be found by searching "UV inactivation curves", especially if you are looking for a particular organism. The environment of the organism also alters the amount of radiation required to inactivate (water or other fluid, embedded in meats, on surfaces, etc.).





Hope this is helpful.


Can bacteria grow better in salt water or fresh water?

it is for a science project.

Can bacteria grow better in salt water or fresh water?
It really depends on the type of bacteria and the temperature of the water. Most species that prefer to live in a human's blood stream will like salt water over fresh. It is a lot more similar in chemical composition. But there are hundreds of water born disease that humans get from drinking contaminated fresh water. Most of these are also bacteria.
Reply:Bacteria grow better in salt water as fresh water is too clean for bacteria to grow.
Reply:They probably have their preferences.


Some may not thrive in salt water and another in fresh.


Which bacteria r deadly to humans?

from where do they come from

Which bacteria r deadly to humans?
☻"E.coli" was first identified in food in 1980, and sporadic outbreaks have become increasingly more frequent.





☻"Anthrax" most commonly occurs in wild and domestic lower vertebrates (cattle, sheep, goats, camels, antelopes, and other herbivores), but it can also occur in humans when they are exposed to infected animals or tissue from infected animals.





%26lt;*-*%26gt;
Reply:Thanks! %26lt;*-*%26gt; Report It

Reply:The list wouldn't fit here. You would volumes and volumes of medical books.





Bacteria come from other bacteria. Some evolve into different strains
Reply:They are all potentially deadly for someone whose immune system is seriously compromised. It also depends on which organ is affected.
Reply:There's E-Coli. But there are some others.

lady slipper

Can bacteria kill a whale?

Sure it can. A bactrerial infection can spread to vital organs like the brain and heart. If the brain dies, the whale dies.

Can bacteria kill a whale?
Yes and you too.
Reply:Yes, a serious enough infection will kill anything.
Reply:bacteria can kill anything living!
Reply:Hi my names pea and im 13,


and i say.... yes





bacteria (if harmfull) can kill anyone. but If it was the bacteria in yoguhurt (good bacteria) and you tipped yoguhurt on a whale ... um i dont think it would die.
Reply:bacteria is the type of an organism that has the tendency to decompose any type of organic material(except polymers)


when the bacteria have the tendency to create havoc inside the body animals by inflicting its ability to decompose, it definitely has the ability to kill the whale from within its own body as it does for we humans.....


Can bacteria found in bread be categorized into facultative anaerobes?

Nope, Because it is Not a Bacterium, a Yeast, but, if I Remember Correctly, Facultative.

Can bacteria found in bread be categorized into facultative anaerobes?
Not really....what you are probably thinking of is yeast, which is a fungus, which bakers will use to make the bread rise. Yeast is a facultative anaerobe, because it can live off anaerobic fermentation as well as aerobic respiration. While there are bound to be plenty of bacteria on the bread, you can't really tell anything about them.


How do cationic surfactants eliminate bacteria?

This is called opsonization. The bacteria and immune cells are both negatively charged, so if they were to come together, they would just repell each other. Cationic surfactants are, as their name implies, positively charged. So when these coat the bacterium, the negatively charged immune cells can now see it, and it is more able to eliminate it.

How do cationic surfactants eliminate bacteria?
The effect is not quite opsonization.





The exact mechanism is not known, but there are a few published papers on the subject:





1.Cationic peptides might kill bacteria by activating their autolytic enzymes causing bacteriolysis


http://bloodjournal.hematologylibrary.or...





2. This paper found that the cationic proteins inhibited oxygen uptake by bacterial cells and damaged the permeability barriers of cells.


http://www.pubmedcentral.nih.gov/article...


If the cells became permeable to everything, they would lose the high concentration of nutrients stored in their cytosol and would allow other antimicrobial compounds to enter their cells easier.


The worst disease caused by bacteria?

What is the worst disease in your opinion? (not including AIDS)

The worst disease caused by bacteria?
the flesh eating bacteria.
Reply:hepititus
Reply:Bacterial meningitis

dendrobium