A subdivision of microbiology dedicated to the study of bacteria.

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Does xylitol kill all kinds of bacteria?

Xylitol is known as a bad bacteria killer in human's mouth. But I am curious about one thing. Does xylitol kill all kinds of bacteria regardless of good or bad? If so, Does xylitol kill bad bacteria ...
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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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Selectivity of anti-bacterial affect of oxygen

As far as I know, oxidizing agents (AKA reactive oxygen species or ROS) are potent antimicrobial agents that act on a broad range of bacteria and viruses, as well as inactivating certain toxins. Is ...
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What are the differences between good (pathogens) and bad (beneficial) bacteria? [on hold]

What are the main differences between pathogens and beneficial bacteria? Is it the only difference that one create a poisonous waste material and other not, or there is something else?
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Can 3% hydrogen peroxide be used as effective disinfectant and antiseptic?

I was curious to see whether 3% hydrogen peroxide can be used as antimicrobial and virucidal product for daily use in home. There are several disinfecting products in the market claim that use of ...
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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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Are antibiotic-resistant bacteria necessarily less virulent than their original strain?

In the absence of antibiotic treatment, is there a reduction in the average severity of disease caused by resistant strains of pathogenic bacteria compared to wild-type ones? I would assume that ...
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Why don't bacterial cell walls prevent bursting when attacked by the complement?

The complement system creates pores in cell membrane which leads to influx of lots of water thereby causing lysis of bacterial cell. But what I fail to understand is that if bacteria have cell walls ...
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30 views

What constitutes as the death of a bacteria?

I've read that some bacteria can survive a long time without food. What constitutes the death of a bacteria ? What process needs to take place for it to be considered dead?
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Can pathogens enter the bloodstream if the epidermis has been scraped off?

Assume that the epidermis has been scraped off by a fall (not just scratched). Also assume that the dermis is completely untouched. Does this allow pathogens to enter the body more easily, or does the ...
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What does completing the course of antibiotics accomplish?

This article from the WHO states: If you stop treatment early, there is a risk the antibiotics won’t have killed all the bacteria that made you sick and that it will mutate and become resistant. ...
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Can Helicobacter pylori be eradicated naturally?

This question is not to discuss whether substances that have anti-H. pylori activity work or not, or to discuss the pros and cons of such but from a medical perspective. Assuming that one is able to ...
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How are antibiotic resistant bacterial infections treated?

For example, how are infections of antibiotic resistant strains of MRSA, Streptococcus, or Gonorrhea treated?
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What causes the development of antibiotic-resistant strains of bacteria?

I understand bacteria have become resistant to antibiotics due to selection pressures, but how do resistant bacteria process antibiotics when exposed to it, compared to non-resistant bacteria. Also, ...
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Risks in bacterial phage therapy

I just finished reading J. Craig Venter's book Life at the Speed of Light: From the Double Helix to the Dawn of Digital Life. The book is a little over a year old now, and Venter has an optimistic ...
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Are there any bacteria with a protective calcified ‘skeleton’?

Some algae like the coccolithophores form coccoliths which are individual plates of calcium carbonate. But are there also bacteria known that can make such a skeleton?
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How to feed bacteria out of lab

I want to take a sample of skin infection bacteria (I suppose combination of staphylococus, strep, etc) and give it to the doctor for analysis but the appointment is in two weeks. The bacteria will be ...
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Parafilm vs Foil for Retaining Plate Moisture while Allowing Gas Exchange

We often plate Streptomyces aureofaciens and grow them in a 30°C room. A post-doc I work with has always loosely wrapped the agar plates in aluminum foil to retain moisture and prevent cracking of the ...
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Comparative effectiveness of antibiotics against colonies and growing bacteria

Appropriate antibiotics usually eliminate bacteria. However are the same antibiotics as effective against bacteria that have grown to form a colony?
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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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Age-Dependent STD Infection

It seems that young females (comparing age 15 vs age 24) are 20x more likely to get chlamydia from a single unprotected sexual encounter with an infected male. What are the reasons for this? Are ...
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After a bacterial infection is dealt with, do any of that colony of bacteria remain?

Suppose that I get a bacterial infection, which my immune system deals with. Are there any remnant bacteria, or are they all gone? Now consider the same scenario, but having been treated with a full ...
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How does the peptidoglycan layer of a bacterial cell wall help prevent osmotic lysis? [duplicate]

I recently read that penicillin works by damaging the peptidoglycan layers of a bacterial cell wall causing osmotic lysis, which is when the bacteria cell bursts due to osmotic pressure. I just ...
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“Most bacteria have at least one cell wall”

In the first answer to How do we find antibiotics? @Ashafix claims that Most bacteria have at least one cell wall Does this mean that there are bacteria with more than one cell membrane? Which ...
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How do infectious bacteria determine when their numbers are high enough to attack a host?

When you get sick, you generally don't contract enough bacteria at once for them to succeed in battling your immune system, right? Their numbers must gradually increase in the host's body before they ...
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Glucose Oxidase, Condition to be Active?

I most recently was reading/watching information on honeys antibatical and antimicrobial properties. The enzyme Glucose Oxidase came up often as a main antimicrobial, yet it is inactive in honey. ...
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Why does cold kill humans but not bacteria? [closed]

Bacteria can continue like nothing happened after being exposed to low temperatures why doesn't this happen to humans as well? Why can't our metabolic machinery continue as normal?
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How can you develop a bacterial infection when taking antibiotics for another area of the body with a bacterial infection? [closed]

How can you develop a bacterial infection when taking antibiotics for another area? For example, "if someone was prescribed an antibiotic for a bacterial infection of the throat and while taking the ...
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70 views

Do bacteria grow on pure dry glucose?

I've accidentally touched pure glucose with my bare hands (fingers to be specific), which was intended for cell-culture. I'm worried that bacteria from my skin may start to grow on the glucose and ...
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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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Serological assays measuring antibody response

Given that an appropriate immune response to a bacteria may be thwarted in an individual, including not producing all of the antibodies which are known to occur in people who have been infected, or ...
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Did the Great Oxygenation Event also cause a mass extinction?

Its usually assumed that the Great Oxidation Event around 2.3 bya caused a great extinction of anaerobic life on earth. But as I was reading Nick Lane's book, ...
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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, sulfide-reducing bacteria (SRB) are more abundant, in high-salt-fed group compared to the ...
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Did Cyanobacteria alone create the oxygen in Earth's atmosphere 3.5 billion years ago?

In other words, is the conveniently close-to-Californian-Universities pools of such representative of accepted theory. With the immediate follow-up question, when did the much more impressive amount ...
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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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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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What is the difference between an antibiotic and an antibacterial?

Concerning medicine, what are the differences between antibiotics and antibacterials?
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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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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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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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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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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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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 "multiply"...
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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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37 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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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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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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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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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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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 ...