A subdivision of microbiology dedicated to the study of bacteria.

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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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53 views

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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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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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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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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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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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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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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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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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 ...
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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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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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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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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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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 ...
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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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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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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 ...
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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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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
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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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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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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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 ...
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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
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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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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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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18 views

Feasibility of “smart effective microorganisms”

This might be a stupid question as I have little to no knowledge of biology, but I would really like to find out if it would be feasible to make such a system as a way of preventing infections. I ...
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What is the advantage of using plant-derived antibacterials rather than bacteria-derived antibacterials?

So obviously we have a big problem with antibiotic resistance. Most of our antibiotics originate from bacteria themselves (or are synthetic variations on scaffolds which originate from bacteria). I ...
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Advocate for the pop-culture idea of withholding vaccination [closed]

While it is widely accepted that vaccination is preferable to not vaccinating, would anyone like to give a shot at providing evidence in favor of not vaccinating? Anything goes.
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Is it worth to experiment with pro-biotics at home?

Let's assume that Joe has done some investigation on Internet and wants to see, if pro-biotics would help him. Now he goes to amazon.com and buys a pro-biotic product with excellent average rating. ...
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Can an argument be made that humans are 90% bacterial?

On the blog, All about Scientist in Microword: Microbiology, I read the post We are 90% bacteria, actually, which says that humans are 90% bacterial cells. If this is the case, then why don't we ...
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Is 100% antibacterial resistance possible?

The quest to develop antibacterial and antibiotic substances has often been described as an arms-race, as bacterial life develops resistance, requiring us to develop novel agents which can effectively ...
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Microbiology- Pseudomonas aeruginosa, BSAC data

I tested Pseudomonas aeruginosaagainst various antibiotics, using Stokes and Kirby-Bauer. When I compared my results with BSAC data it was completely different (understandable) but why for a lot of ...
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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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1answer
120 views

Why do bacteria need messenger RNA?

Why do bacteria need mRNA? Isn't the DNA free floating without nuclear membrane so why doesn't the tRNA read the code directly off of the split DNA strands? (ofcourse after helicase splits them). ...
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Why isn't the RNA in bacteria always split up and replicating?

Isn't helicase always free floating in bacterial cells, and the DNA without a nuclear membrane and uncoiled and freefloating and so why doesn't the helicase keep breaking the double helix of DNA? ...
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57 views

How does the immune system recognize pathogens?

There are useful and pathogenic bacteria in our body. How does the immune system differentiate between them?
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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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percentage of animal diseases caused by bacteria?

I know this is a long shot, but what is the approximate percentage out of all the animal diseases that are caused by bacteria? One of the Q&A websites answer it as 90, but is there any conclusive ...