A subdivision of microbiology dedicated to the study of bacteria.

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How can bacteria adapt to a rich in resources environment?

How can "normal" bacteria adapt to a non-extreme environment better than extremophiles in terms of foraging resources? If I could somehow eliminate all the factors like temperature, acidity and ...
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2answers
63 views

How much genomic variation one usually find within a given bacterial species?

If I find the exact starting position (say 1152471) of the coding sequence of a given gene in the genome of a bacterium, is the genome of the bacterium in general stable enough so that I can expect to ...
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1answer
70 views

What does NaOH do for the plating of Bacillus subtilis?

A book called Molecular Biological Methods for Bacillus called for plating Bacillus subtilis cells on LB-agar plates with the following components: A general-purpose medium containing per litre: ...
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38 views

What did cyanobacteria gain from photosynthesis?

As far as I understand, cyanobacteria began performing photosynthesis long before plant cells as we know them arrived on the scene. But cyanobacteria do not seem to use polysaccharides in the same way ...
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9 views

database for bacteria habitat

I was wondering if there is a database where you can find the habitats of different bacteria. Because I'm using BLAST to identifiy sequences, however I need to check if my result are appropriate ...
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1answer
38 views

Does drinking alcohol having UTI may help to kill the bacteria?

It's well known that ethyl alcohol kills bacteria. And amount of alcohol in urine may be detected by EtG tests (as long as 3-4 days after intake). Does drinking alcohol in reasonable amount by ...
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8 views

Bacterial Flagella P and L ring act as 'bushing'?

It is often stated that in bacterial flagella the P and L rings act as bushing (like in a motor). I have looked up bushing but can't seem to find a description that would fit in the case of bacterial ...
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1answer
22 views

Link between NaCl and sulfide reducing bacteria

Could there be any link between the consumption of NaCl and sulfide-reducing bacteria? In my study on mice, I can see, by adding more NaCl to mice diet, less (or to be more accurate, zero) ...
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2answers
33 views

Comments on Experimental result regarding Anti-Bacterial soap

After using soaps, we rinse our hands with water. Do bacteria from the water attach themselves to our hands again? If we wipe our hands to cloth after washing our hands, do bacteria from the cloth ...
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3answers
29k views

What is the difference between an antibiotic and an antibacterial?

Concerning medicine, what are the differences between antibiotics and antibacterials?
3
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1answer
59 views

Why doesn't the rest of the body have something like the “blood-brain” barrier to protect itself from pathogens?

According to Wikipedia: "The blood–brain barrier acts very effectively to protect the brain from most pathogens". This is because the pathogens cannot pass through the tight junctions of the ...
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1answer
948 views

I don't want to know what bacteria is called but if the bacteria from unborn babies have benifits on health? [duplicate]

This question is not the same as the duplicate. I was told that when babies are born they are born with bacteria in their stomach. When a child takes antibiotics are there unique bacteria destroyed ...
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6 views

Why does a semi-set curd not set completely after a round of churning?

I left a pot of milk to turn into curd. While it did look like it had turned to curd since it started coming off the sidewall of the pot, but after having churned it, I realized that it wasn't set ...
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18 views

How do I “reinoculate” a petri dish with new bacteria?

Hypothetical question, intended to find a general procedure rather than case-specific recommendations: I have a petri dish full of growth medium with a large population of gram-negative, anaerobic ...
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30 views

Resources for a practical guide to bacterial identification per human specimen

as an instructor in medical microbiology department in a medical college, I need to know what other people use in their practical sessions for post-graduate students as their short yet concise ...
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1answer
51 views

Why doesn't one develop immunity to bacterial STIs?

Why doesn't one develop immunity to STIs such as Chlamydia/Gonorrhea and Syphilis even after the first exposure and treatment with antibiotics?
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1answer
22 views

Multiplication of bacillus subtilis

I have a supplement for use in horticulture. It is a powder that contains mostly subtilis with smaller amounts of a few other strains. Prior to horticultural application I would like to ...
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0answers
29 views

Why do gram-positive bacteria cause respiratory diseases more frequently than gram-negative bacteria? [closed]

My theory is that aerobic respiration by gram positive bacteria thrives in ideal conditions of the lungs therefore creates respiratory diseases?
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1answer
36 views

Detection of bacteria to measure quality of water

I have been working on a science project were I have built a water filter. To prove that it works I would need to test if there are bacteria in a sample which has been treated vs a sample that hasn't ...
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0answers
31 views

Is this bacteria or fungi?

I've been growing bacteria on an agar plate and after putting the dishes in the incubator, this is what I saw. I'm new to bacteria identification, and is this just contamination by fungi or is this ...
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Can bacteria, viruses, and cancer cells be destroyed by resonance?

Radiotherapy has been used to treat cancer. Can the resonances by coordinated electromagnetic waves (and/or other forms of waves), of various frequencies, amplitudes and pulse rates, directed from ...
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1answer
45 views

What prevent us from synthesizing a cell from “scratch”?

In this recent article "Design and synthesis of a minimal bacterial genome", they created a minimal cell with only 473 genes. However, they didn't synthesize all of the necessary components of the ...
2
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1answer
80 views

How do minute changes in an organism, as a result of evolution, get carried over to next generation

The theory of evolution states that random variations in organisms occur to better suit their surroundings. We take for example a bacteria's flagella. There's a bacteria who has a tube kind of ...
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2answers
221 views

Gas from bacteria that's not methane

Is gas produced by bacteria always mainly methane? Or, are there bacteria out there that produce some biogas composed mainly of hydrogen, natural gas, propane, butane?
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40 views

What kind of organism grows in two-day-old lemon water? [closed]

I had a cup of lemon water on my desk that had been sitting out for 2-3 days. Today I took a sip without even realizing this. I looked at the water and it had something growing in it that looked like ...
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14 views

Growth charecteristics of Bacillus and Lactobacillus Species [closed]

Does anybody know weather the media (Hichrome Bacillus Agar) supports both Bacillus and Lactobacillus species, it is supposed to be the sample of the Lactobacillus plantarum spread on Hichrome ...
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18 views

Do plant and animal bacterial pathogen differ too much?

I will be involved in a plant disease produced by a bacterial pathogen, Acidovorax citrulli. I've previously worked with animal pathogens such as Haemophilus parasuis. Are there any big differences ...
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1answer
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How to obtain bacteria samples at home?

As the original question went from hold to closed, I thought I would write up a more appropriate question. How should one go about getting bacterial samples to look at under a microscope at home? ...
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29 views

Can oral bacteria be targeted by white blood cells?

Today I was told from a dentist that a leukocyte is much larger than a bad bacterium. So a leukocyte cannot remove bad bacteria when they hide in very places like the space between the gums and teeth ...
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2answers
62 views

How can I make sure my UV-purificator kills bacteria?

I'm going to show a UV-purificator for water on science fair. How can I easily check if purificator kills most of the bacteria? I need a quick and possibly easy method.
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22 views

Are there bacteria that respire anaerobically in aerobic conditions?

There are facultative aerobic bacteria that switch to aerobic respiration in an aerobic state, but are there any organisms that would still perform anerobic respiration even when shifted to aerobic ...
3
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1answer
39 views

When streaking microbes on a plate to test growth after uv exposure, does how I streak make a difference?

I've been working on what I think might be a special strain of E. coli, I've been streaking it on LB agar plate and exposing it to varied times of UVC via the germicidal hood. I'm wondering if how I ...
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1answer
175 views

What is the difference between a bacterial artificial chromosome (BAC) and a plasmid?

Is it just that a BAC is generally larger and artificially constructed? Or are there any other differences?
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2answers
50 views

Blood testing for chlamydia

I am working with the bacterium Chlamydia trachomatis. The main test for this species is the naat test, which is based on amplification. But I would like to know how the bacteria affects the blood ...
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6 views

Reasons for variable quality virus production

I am making MSCV retrovirus, using DH5α cells to amplify a plasmid of interest, qiagen's midiprep kit to purify out the plasmid, then 293ft cells to produce the retrovirus, and 3t3 cells to test MOI. ...
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36 views

Effects of antibiotics on bacterial growth [closed]

I will do an experiment on effects of antibiotics on antibacterial growth and I will use three antibiotics: ampicilin, chloramphenicol and streptomycin. To make a hypothesis I must have a guess on ...
2
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1answer
107 views

Pink growth (aka pink slime) in bathtub or shower

I was wondering if anybody had studied or was knowledgeable about the pink growth that people often find around water fixtures in their homes, especially bath tubs and showers? My understanding is ...
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3answers
3k views

How do viruses or bacteria survive outside the body long enough to spread?

Say I cough on my table, then someone else touches it and picks up something I've got... how is it that these things can live outside the body, how long can they manage it, and how long is generally ...
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17 views

How to promote denitrifying microbe activity

I'm an amateur fresh-water aquarist looking at the problem of nitrate reduction (into largely-inert nitrogen gas) in a small-scale aquarium environment. The process of turning the byproducts of fish ...
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1answer
44 views

What is a catalytic domain?

I have to answer a few questions from an article I'm reading, and I am just really confused on defining "catalytic domain." I have to relate it to the antibiotic Teixobactin. Is catalytic domain the ...
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31 views

Bacteria surviving a β-lactam antibiotic

What changes can occur in the cell wall of a bacteria for it to survive a β-lactam antibiotic? I think that because a bacteria possesses peptidoglycan in its cell wall, they are β-lactam sensitive, ...
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129 views

Two different sized colonies from the same species of bacteria. What does it mean? [closed]

I have got two different sized colonies in a plate of Salmonella Paratyphi, identified by biochemical methods. What does two different sized colonies mean? What kind of question can I investigate in ...
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2answers
109 views

How is a bacterial strain defined?

When a species of bacteria is referred to by its strain, are they a clone of single founder or is a certain amount variation allowed?
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1answer
31 views

How long can you effectively store a glycerol stock at -20 degrees Celsius?

I know that glycerol stocks are typically kept in a -80 °C freezer, however there are some people who do not have access to such equipment. How long would you be able to keep a glycerol stock at ...
4
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1answer
52 views

Decomposition Rate of A Body In A Wet Environment [closed]

I have a photo of a decomposing dog which is in a water logged environment. My peers and I are debating how long that body has been decomposing. They are saying it is at least a year old. I however ...
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23 views

How do microbes develop resistance to anitmicrobial peptides?

I would like to better understand how bacteria use the "strategy" of alternations to lipid A and membrane proteins in order to resist antimicrobial peptides of the immune system? It is my ...
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1answer
51 views

Examining milk for presence of harmful bacteria

I am not experienced in diagnostic bacteriology and am interested in understanding more about it in the context of analyzing food purity. For example, imagine I have a supply of raw milk which might ...
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0answers
15 views

Are Betaproteobacteria more 'simple' than Gammaproteobacteria?

More generally, are all proteobacteria named in order of complexity (Alpha, Beta, Gamma, Delta, Epsilon)? If so, would it be right to say that Betaproteobacteria can survive in lower nutrition / more ...
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19 views

how to calculate dilution factor and CFU

I'm very confused I did a bacterial experiment where i added 5 grams to 70ml of distilled water that contains 10g of fresh meat. I left it in a sampler container over 24 hours then i cultured ...
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1answer
573 views

How heavy are all foreign microorganisms in and on the human body?

I define "foreign microorganism" as a microorganism which is not produced by the human body (not antibodies or leukocytes) including bacteria, viruses, fungi, biofilm aggregates or small lifeforms ...