Bacteria Definition and 152 Threads

Hi there, Recently I've been reading about tagging bacteria with GFP, mCherry and other fluorescent proteins. The article I'm reading now (Lagendijk et at., 2010, Genetic tools for tagging Gram negative bacteria with mCherry...) has information on tagging Gram-negative bacteria, but it...

Kinematics -- centrifuging a solution with bacteria Homework Statement In the lab, we have to separate the bacteria from the solution by centrifuging the solution with bacteria. Because the bacteria are more massive than the media molecules, they settle to the bottom of the container. For...

Wikipedia suggests a typical human has ~ one trillion bacteria on their skin. That’s orders of magnitude more than a cell phone and many many orders of magnitude more than a toilet seat. They typically don't cause disease and may offer benefits. It kind of bothers me that there’s this common...

1. About how many cells were plated to count His+ revertant colonies? How was total cell number determined? I know that the mutation freq was out of 10^7 survivors. So they had to measure the total cell number and come up with 10^7 survivors? But I'm not sure how they got this...

What does it mean that "acid is produced from ____" by bacteria? I've identified a bacteria (specifically stephococcus thermophilis) and am using Bergey’s Manual® of Systematic Bacteriology to learn more about it. The manual states S. Thermophilis produces acid from glucose, but not from...

Q: Which of the following mutagenic treatments would be least effective in creating a mutation in non-replicating cells? Explain your choice. a. Treatment with a deaminating agent like nitrous acid b. Treatment with an alkylating agent like MMS c. Treatment by exposure to UV d...

Good bacteria are a normal part of the flora that live in the intestines and are necessary for healthy living and good digestion. Recently I had a urinary tract infection caused by a bacteria, and the doctor prescribed a strong antibiotic, Cipro, for seven days. It worked and the infection is...

A while back we were discussing the microscopic life that I had grown in a jar from a sample from my backyard mulch pile. I was enjoying using a nice surplus Nikon microscope from UC Davis, CA to check out all the different creatures that were coming to life in the material in a jar with some...

Hi, I want to run an experiment to try and experimentally determine the efficiency (as in what percent of energy is converted to light) of bioluminescent bacteria (V. Fischeri), and compare it to the efficiency of a "traditional" light source, like an LED or an incandescent. I know how I...

http://news.discovery.com/earth/russia-finds-new-bacteria-antarctic-lake-130307.htm

It sounds like if hospitals take necessary precautions, deaths from the new resistant strains of bacteria can be reduced and even stopped. I am posting this so that more people will be aware of the risks and can ask about it if they need to stay at the hospital. I know I will if I have to have...

Is this question equals to "after 9 hours"? I'm saying this because with each 2 hours, it's growing by a factor of 6 right? So it should normally be "after 9 hours" that the bacteria would have that mass?! I just want to know if it's right or not. I know of another way to solve it but it gives...

Would extraterrestrial bacteria be dangerous to us if we physically came in contact with such?

I'm always amazed by studies involving super bacteria. I'd love to hear about all the research you have come across involving bacteria. Here is a recent one I just found: Superman-strength bacteria produce gold from gold chloride...

I'm curious about food preservation. Which are the most common dangerous bacteria? How quickly do they grow? What sort of conditions? And how many must be present to pose a threat to a human? Also, how do they survive the stomach? Do they infect via the mouth or esophagus?

We know that a lot of bacteria are present in our body like in our stomach etc. Where do they come from? It's hard to think that at fertilization there is information stored somewhere in the fertilized egg that these bacteria are to be produced which will help in digestion. In other words they...

Homework Statement dP/dt = (3000)/(1+0.25t) This gives the rate population changes at We also know P is 1000 when t is 0 (days) The Attempt at a Solution The anti derivative 12 000 x Ln(1 + 0.25t) + c Do I just make this equation equal to one million?

I'm having this endless dispute with my mother: she cleans her computer keyboard everyday, is careful not to put her handbag on the table etc... in the name of keeping bacteria away. This kinda makes sense, since bacteria can cause illnesses, but... I don't see any reason why it couldn't be...

I was discussing the concept of free will with my professor and he asked me to ponder over the question of whether bacteria has free will. I answered no as everything it does has a simple reason like it will move towards food whereas it will move away from an unpleasant area and so on. It...

Homework Statement The bacteria in a tuna sandiwch left out of refrigerator grows exponentially. The number of bacteria in a sandwich at any time, t, in minutes can be modeled by the function N(t)= No[3^(t/35)] a)if there are 600 bacteria initially, how long will it take for the bacteria...

Hello everyone, I'm very new to microbiology and does not have any background knowledge, so I have some simple questions on identifying different bacteria on agar plates. I have some questions and I have answered them the way I think. Please correct me where nessecary. 1. First of all...

Homework Statement Does anyone know whether Iron Bacteria can be found in seawater or not? Homework Equations The Attempt at a Solution

Homework Statement 500 blue and 500 orange bacteria are placed in a growth medium. Each bacterium divides every hour. A predator eats exactly 1000 bacteria per hour irrespective of color. a) What is the ultimate probability distribution for the colors of bacteria in the growth medium? b) How...

So we are learning about vectors and how you can insert vectors into a plasmid and then that plasmid in a bacteria will make lots of copies of the protein that your sequence codes for. I don't understand how inserting the DNA that codes for a protein into a bacteria gives you just the protein...

Does anyone have any suggestions on how smoke kills bacteria? Thanks in advance for any suggestions

Homework Statement A bacteria culture starts with 840 bacteria and grows at a rate proportional to its size. After 3 hours there will be 2520 bacteria. How long will it take for the population to reach 1030 ? 2. The attempt at a solution dP/dt = k*P dP/P = k*dt *Integrated both...

Basically the question is: Can your gut flora change slightly by kissing a lot? Will it have an effect on your digestion? Can you change weight because of this? It kind of works in lab experiments with mice and it exists for babies.

The title says all I'm asking. Thank you.

What are some viruses and bacteria that affect the immune system? I'm writing a synthesis essay for my AP biology class about a virus or bacterium that affects the immune system (we're covering the immune system). Most of the obvious are already taken, eg. HIV, influenza, etc. I'm looking for...

I was just wondering where all the bacteria in our bodies comes from? Does it enter the body through the mother during pregnancy? Also how does the body know how much to let in?

bacteria space travel ! If a bacteria was traveling through space at the speed of light would the cells divide at a constant or relative rate. Also would space travel effect the number of divisions..

If we had a powerful enough computer, and we supplied to it the laws of physics known so far and the atoms a bacteria was made out of at a certain time, would the simulation then show the actual behavior of a bacteria? Or more compactly: does current physics suffice to explain all the facets...

Is there any way to kill bacteria in raw ground sirloin without cooking it? Possibly some sort of light or UV? I have been eating raw sirloin with onion sandwiches occasionally for 30+ years with no problems. (they used to serve it at weddings) It is awesome! After this came up in a...

Since it obviously takes energy and extra amino acids to express the green fluorescent protein, so it's possible that bacteria expressing GFP might have slightly lower fitness (on average) than bacteria that aren't expressing GFP. I'm sure the effect is negligible in most cases. But maybe...

Does stomach acid kill all bacteria that you eat? If it does, then how do we get food poisoning?

Hi, I am about to start making bulgarian yoghurt with unpaseurised gersey milk. The food forums say that the bacteria in the milk will compete with the yoghurt bacteria and so should be reduced (not necesserilly killed altogether) without destroying the enzimes and milk protiens. In...

Say we take a carrot... or steak (or whatever food you fancy) and put it in a sealed container along with a culture of 'normal' bacteria (I'm talking about the regular bacteria that would be present to decompose food). Now, here comes the question: What would be the most effective way to stop...

Homework Statement and after 3 hours there are 600 bacteria. Assuming bacteria grow at rate proportinal to their size, which means you can use the function, y=Aekt, where y is the number of bacteria and t is time in hours. 1) find the number of bacteria after 5 hours, 2) when will the...

Are there plans to treat the BP oil spill with oil-eating bacteria? http://news.sciencemag.org/scienceinsider/2010/04/can-microbes-save-the-gulf-beach.html

We are interested in looking at the effect of the pulsing of microwaves subjected to power and time of eg 50W for 10 seconds at 2.45GHz but pulsing the microwaves as well to investigate the added kill effect that the pulsing adds, comparing plate counts before irradiation, after non pulsed...

Hi, I'm doing a high school project, and I'll need a lot of help... I'm trying to figure out what bacteria in the rabbit's digestive system that helps the rabbit to digest cellulose. I've searched, but wikipedia or any other website just say "good bacteria". Could someone give me the exact...

ok so I work in a chemistry lab but I am a microbiology major. Our lab works with endophytes. We have a positive result for one of them and I have to identify this thing by April. This task seems impossible to me. They did not keep track of where this sample came from or even which organism it...

When you say species of cat, you say exactly that, cat, not cats, the singular, don't you? There seems to be a mixture when it comes to bacteria. Some sources say species of bacteria, others speices of bacterium. Would you say "How many species of cats are there?" or "How many species of cat are...

A bacteria culture initially contains P(o) cells and grows at the rate dP/dt = kP where k is a growth constant. After an hour the population has doubled. (a) Determine an expression for the number of bacteria present after t hours. (b) Computer the number of bacteria present, and the rate of...

I recently came across this article: http://www.newscientist.com/article/dn14094-bacteria-make-major-evolutionary-shift-in-the-lab.html Has anything on this scale ever been observed before? Lenski's freezer must be an immensely valuable source of evolutionary information. And one question, why...

Virus and Bacteria? What is the difference between virus and bacteria? What are the advantages and disadvantages of them?

Did viruses exist before bacteria ever existed on Earth?

Does the immune system neutralise the toxin created by the bacteria or does it only neutralise the bacteria. Or is it both? Thank you Also while we are at it how exactly does bacteria weaken something. For example if Bacteria infected a valve how does the valve get damaged is it because of the...

In my experiment with R.rubrum bacteria, which can grow phototrophically in anaerobic conditons, and by fermentation in dark anaerobic conditions, I am noticing that the bacteria are growing at the interface between the oil and the water. The experimented is testing: photoautotrophic growth...

My employer operates a biological water filtration plant. The first stage of filtration has the raw water passing through a filter embedded with bacteria, the processes used here is aerated biological treatment where oxidizing processes (bio-oxidation) are used and the microbes gain energy when...