Bacteria Definition and 157 Threads

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...

A facultative anaerobe is growing photoheterotrophically in sterile water, covered with a thick layer of oil inside a test-tube containing 1g fructose. It has been observed that the bacteria are growing at the water/oil interface, and appear to be growing inside the oil layer. Which of these...

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...

A number of strains of microalgae are known to produce relatively high yields of energy as fuel stock [pre-biodiesel] in the form of plant oils, as a function of area and time - typically as BTU/acre-year, or MJ/hectare-day, etc. From a review of the literature, it is my perception that...

I have been reading reports about a scientist that has claimed to have cultured bacteria spores that are around 30 million years old, and another research group has claimed to have revived 250 million year old bacteria from spores trapped in salt crystals. Reference...

1. Homework Statement A beaker contained 2000 bacteira. one hour later the beaker contained 2500 bacteria. What is the doubling time of the bacteria? 2. Homework Equations rate = (distance)/(time) Time to double = .693/((ln(1+r))^t) 3. The Attempt at a Solution rate = 2500/2000...

Homework Statement A beaker contained 2000 bacteira. one hour later the beaker contained 2500 bacteria. What is the doubling time of the bacteria? Homework Equations rate = (distance)/(time) Time to double = .693/((ln(1+r))^t) The Attempt at a Solution rate = 2500/2000 My...

So I was just thinking about how our eyes can't see things too far and too near and how there is so many microscopic reactions and organisms that we can't not see. And I just got this mental image, of my single knuckle zooming in, and it looks like a mountain. Its very discolored and there is a...

http://www.sciencedaily.com/releases/2008/11/081119171523.htm ScienceDaily (Nov. 20, 2008) — Brent Christner, assistant professor of biological sciences at LSU, recently found evidence that bacteria and biological cells are the most efficient ice-forming catalysts in precipitation from...

Why is it that a cutting board smeared with lunch meat can be sanitized by weaker acids better than the stronger acids? (weaker acids as in vinegar/grapefruit juice) (stronger acids as in lemon juice/lime juice) Grapefruit has more sugar than lemon or lime. So, can I assume that sugar has...

Homework Statement The doubling period of a baterial population is 20 minutes. At time t = 120 minutes, the baterial population was 80000. With t representing minutes, the formula for the population is p(t)=A e^{kt}. k=? The initial population at time t = 0 is:? The size of the baterial...

Hi, Does anybody know where on the web can I find photos of bacteria? I'm searching for co-agulase negative staphylococcus albus and C xerosis. Thanks a lot.

I am not really sure how to find the original concentration of bacteria for my experiment. This is what i did: I made serial dilutions of 10^-2, 10^-4,10^-6, 10^-8 with stock bacteria. From 10^-4 dilution, I took out 2ml and inoculated into 20g potatoes + 180g buffer. Potatoes + buffer +...

Bacteria Make Major Evolutionary Shift in the Lab This is pretty cool.

Most antibiotics are derived from microorganisms that do not occur naturally in the human body. Most infectious bacteria showed no resistance to these antibiotics when they were first used in the 1940s, because pathogens (disease-causing organisms) did not already have antibiotic resistance to...

A student is examining a bacterium under the microscope. The bacterial cell has a mass of 0.200 (a femtogram is 10^-15) and is swimming at 4.00 microns per second, with an uncertainty in the speed of 5.00%. E.coli bacterial cells are around 1 micron, or 10^-6 meters in length. The student is...

http://www6.comcast.net/news/articles/science/2008/02/28/Snow.Bugs/print/ it seems so: Brent C. Christner, Cindy E. Morris, Christine M. Foreman, Rongman Cai, David C. Sands;2008, http://www.sciencemag.org/cgi/content/abstract/319/5867/1214Science 29 February 2008: Vol. 319. no. 5867...

a bacterial population B is known to have a rate of growth proportional to B itself. if between noon and 2 PM the population triples, at what time, no controls exerted should B become 100 times what it was at noon? what does it mean by between noon and 2pm? does it mean that it takes 2hrs...

I like fresh mixed vegetable, they are sold cheaply so very very much more than the country I have been to, but the hygience seems more problematic If I leave the vegetable inside the fridge for hours till it gets frozen completely, will all the bacteria be get rid of by the low temperature ...

If all I have given is that 1. Bacteria grows at a rate proportional to it's size. 2. It doubles in 2 days. 3. At 10 days, population is 1000. I'm not given the initial bacteria count, I need help setting up the equation. I did: dy/dt = ky => dy/y = kdt => lny= kt + c =>...

I've looked all over and I can only find information on blood agar hemolyis for gram positive bacteria. Can I take this to mean that gram negative bacteria are generally gamma hemolytic? If so, are there any notable exceptions to this? One that I would guess is pathogenic E. coli, which cause...

Dear all ! Does anyone have experience with methanotrophic bacteria ? The background of my question: I am trying to explore a new pathway for the reaction methane to methanol. One can basically think of two approaches: a) chemically via classic catalysts, b) biologically via enzymes or...

If I place a quart jar of water that has been tested positive for bacteria into a 1000w microwave, how long will it take to kill 100% of the bacteria. Thank you, Dell

From Quantum Evolution (Johnjoe McFadden) 1. What biological feature of a bacteria allows it to 'see' or detect a given wavelength of light? What part of or feature of the cell detects light of a given wavelength? 2. Are these not single celled organisms? 3. How common is this feature?

Heres how: Is it possible that a mechanism like this is also involved in the origin of life? When they say the bacteria are dead and then reassemble their DNA, isn't this a form of abiogenesis?

We're on the section of logarithms, so I'm guessing this has something to do with them... If the size of a bacteria colony doubles in 5 hours, how long will it take for the number of bacteria to triple? I know that doubling time and all that stuff is independent of the amount of something...

New finds from (aquatic) microbial cataloguing studies show that there's way more kinds of bacterial life in seawater than previously estimated. http://news.bbc.co.uk/2/hi/science/nature/5232928.stm Couldn't easily find the original source. Maybe it's not made it's way out yet? Related article...

http://www.newscientist.com/article/dn8933-bacteria-use-slime-jets-to-get-around.html Myxobacteria are quite an interesting bacteria because it's predatory and works as community very well. I wonder how fast the slime has be "oozed" out to create motion and how much energy is used. I am...

How do you take bacteria from skin and which is the part :rolleyes: most concetrated with them?

Because Bacteria evolve far faster than humans, bacteria would be ideal for testing evolution. If you isolate one bacteria population from another after a while they should evolve into different species, right? Actually, I have heard this test has already been carried out but is this true? If...

"Kills 99.9% of bacteria" You know how on basically all anti-bactiera product commericals (soap, kictchen cleaner, hand santizer..etc), they always say "kills 99.9% of bacteria", what I'm wondering is, what is that 0.1% that they can't kill, is it something specific? hope this doesn't sound...

What do magnetite crystals found in some bacteria exactly do? I heard it helps them move around but, how would that work? Can they not move on their own? Are they always only affected by the Earth's magnetic field?

You are probably aware of migratory behavior of birds. But what is the mechanism that accounts for this? It is based on a unique biochemistry that incorporates ferromagnetic material (magnetite) within them and utilizes their orientation to govern its spatial movement (horizontal and...

How does the immune system distinguish between beneficial bacteria (e.g., those that aid in digestion) vs. harmful bacteria, particularly when they can be one in the same (e.g., E. coli)? Or perhaps our bodies fight all bacteria regardless of their status and it's just that the sheer numbers of...

You're getting more than you bargain for at the cosmetic counter according to a news report I heard last evening: http://www.prevention.com/article/0,5778,s1-5-123-146-4961-1,00.html http://www.signonsandiego.com/uniontrib/20050426/news_lz1c26makeup.html...

Hello everyone. I thought I might be better off starting in this forum, but I wouldn't be surprised if this thread will be moved to one of the physics boards. 1. Reheating meat, activates bacteria, which is not healthy for us humans, correct? 2. While operational, everything inside the...

My friend had to do this problem in Calculus BC. I'm no good at calculus, but I decided it was be fun for someone to figure it out for me. A bacteria culture starts with 500 bacteria and grows at a rate proportional to its size. After 3 hours there are 8000 bacteria. (a) Find an expression...

Someone (in GD), who is going for a long period without bathing or showering, made the comment that bacteria are good. Well some are, but many others are not, particularly those of the staphlococcus group. from http://kidshealth.org/parent/infections/bacterial_viral/staphylococcus.html...

Research is being conducted at ASU regarding the decreasing number of amphibian species due to Batrachochytrium Dendrobatidis, which I believe is a virus. Elsewhere research has been conducted regarding loss of coral reefs, specifically sea fan disease. In relation to the sea fan disease...

Disinfectant and bacteria experiment! VERY URGENT Hi.I have done an experiment recently about the effect of disinfectant on the rate of bacterial growth.I used four disinfectants.Say A,B,C and D.A came out to be the best disinfectant followed by B C and D.I want to do the analysis now but i am...

Should i cover my Erlenmeyer bottle with a folie when i shake my bacteria in the shaker? Should the covering be tight or loosen? Any suggestions? Thanks.

pls if anyone can answer the following, ill be so grateful... - do bacterial cells and plant cells have chromosones, glycogen and cellulose?? - why is a virus not considered to be a cell?? - wots the difference between the appearance of yeast, bread mould and the field mushroom? ( is it...

Hi. I am doing an investigation on the effects of different antibiotics on Gram positive and Gram negative bacteria. 1) Can you say that antibiotics and bacteria form a chaotic system? Can a very small change in concentration of antiboitics, or a small variation in pH, change the diameter of...

I am doing an investigation on: comparing effects of antibiotics on Gram +ve and -ve bacteria. I have used 8 antibiotics and I have measured the diameter of killing zones. I am a bit unsure of how to carry out the analysis. I will be using Mann Whitney U Test, but what about graphical...

Would it be feasible to genetically engineer cyanobacteria so that they could exist in extreme climates and pressures? Then, could we make a jar full of them and throw it into some inhospitable planet that we believe have liquid water underneath its surface, so that the bacteria could...

I was just reading something in my chem book about the nitrogen fixation process of bacteria. It said that trees need the bacteria to do this process. As a side thought, I think trees are mostly carbon, and a seed grows relatively fast. I was just wondering where does a seed get this large...

Hi I just need to know if there was a standard concentration for the acid and base that I am going to use to change the pH of the media that I am making for bacteria? I am using NaOH and H2SO4. THanks

Hey guys, I have two questions: 1. My friends niece was brought into the hospital last night with suspect of spinal meningitis. They don't know if it is bacterial or viral yet. The doctor went ahead and started treating the niece with antibiotics, but they think (and are hoping) it is...

HUGE Bacteria! I don't know if it has been brought up before, but while I was just making random searches on the net (when I should have been doing homework) I found this I was amazed. I kinda want some in a fish tank or something, kind of like having sea sea monkeys in you fish tank.