Questions tagged [bacteriology]

A subdivision of microbiology dedicated to the study of bacteria.

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What is the rate of bacterial cell death due to viruses on land?

"The rate of viral infection in the oceans stands at 1 × 10^23 infections per second, and these infections remove 20–40% of all bacterial cells each day." - https://www.nature.com/articles/...
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What compounds are consumed/produced by Staph. aureus grown on Mueller Hinton agar over time?

I wonder what are the essential components on Mueller Hinton agar that S. aureus consumes and produces. I imagine there are preferred energy sources and as soon as those compounds run out the organism ...
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How to get Bacteria to attach to an Object?

I have cultured Cyanobacteria (in a media) in a beaker. I want that bacteria to attach to a cloth (e.g. Carbon). My current method is using a syringe to slowly push the bacteria to one side of a ...
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Can bacteria be killed by purely physical trauma?

In a question over on Skeptics Stack Exchange, I half-jokingly listed "blunt force trauma" as a means by which a bacterium could be killed. That makes me wonder if it really is only a joke ...
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How can life survive in the water under the Antarctic ice? [closed]

If there is life in the lakes under the ice of Antarctica then how can those bacteria survive? Where do they get energy from? https://www.google.com/amp/s/www.livescience.com/amp/64501-buried-lake-...
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Can a bacterium infect another bacterium?

I researched about it by searching on Google and reading some bacteriological articles, but I did not get any answer. I also asked some of my teachers, and they were also a bit confused. Some said ...
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“Bacteria don't have membrane-bound organelles.” Are sulfur bacteria or Cyanobacteria exceptions?

Can bacteria have membrane-bound organelles? I read this many textbooks: Bacteria cells are simple cells that do not contain a nucleus or other membrane-bound organelles. However, they do contain ...
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Low-cost simple water testing for faecal contamination

I live in Indonesia and there are lots of sewage pipes discharging directly from homes/restaurants/etc directly into the river. It's also common to wash clothes and so on, so there is likely detergent ...
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Do most bacteria have plasmids?

Do most bacteria have plasmids? I googled that and I found this Yes, Plasmids naturally exist in all bacterial cells. Here But I know some of them don't! Is this sentence scientifically correct? ...
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Why does vacuum sealing of foods prevent spoilage from anaerobic bacteria?

I have noted that many purchased food items in containers only require refrigeration after they have been opened, thus eliminating the vacuum seal. Air contains bacteria and fungus spores that enter ...
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Can bacteria (dis)assortatively mate?

After revising some evolutionary concepts, I stumbled on the "big five" of evolution (e.g., mutation, selection, mating, genetic drift, gene flow). I wanted to understand if mating as in &...
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Are diplobacillus physically connected?

I know that a diplobacillus is a bacillus bacteria that has a buddy 'attached' to it. What I haven't been able to determine is exactly how is it 'attached'? Are their cell membranes fused - are they ...
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Horizontal gene transfer in a bacteria

I encountered an old examination question: Which of the following is not required in Bacteria for horizontal gene transfers? Infection 2. Translation 3. Transformation 4. Conjugation 5. Transduction ...
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Staphylococcus (antibacterial soaps and Traditional Lathering soaps)

I have been working on a biology research assignment regarding the claim: Antibacterial soaps are superior to traditional lathering soaps in minimizing the transmission of disease I have made a ...
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Is there any description about how microbes spread from a small place to a very large place?

Is there any materials (such as books, papers or others) about how microbes (such as the bacteria or virus) or a special kind of microbe spread from a small place to a very large area (such as the ...
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How do animals contain and dispose of bacterial endotoxins (lipopolysaccharides)?

Gram negative bacteria naturally release endotoxins which are lipopolysaccharide molecules. These molecules are toxic to many eukaryote cells, including macrophages. My question is how animal ...
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Interpretation of Pangenome: high number of accessory genes

I performed a pangenomic analysis on a collection of 52 strains belonging to the same genus (some 5-6 different species). All the strains were isolated from the same environment: interior compartment ...
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Which is the most extreme thermophilic bacteria known?

Extreme thermophilic bacteria thrive at any temperature above 40/50°C. Thermotoga Maritima seems to be the bacteria that can survive at the highest temperature up to 90°C (reference 1, table 2). I ...
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Will ammonia continue to accumulate in an aquarium tank if a strong antibacterial or chlorine is added to the water?

I've always wondered what would happen if dead plants and fecal matter lay in chlorinated waters and/or waters treated with strong antibacterials or antibiotics. I've heard that aquarium tanks ...
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Do viruses or bacteria have a flavour?

My 9 year old niece asked me this when I was explaining some stuff to her about the coronavirus. She asked "What does this virus taste like? Can I tell whether my sandwich is contaminated for ...
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How can I obtain a uniform bacterial sample?

I'm currently doing a research project wherein I will be testing the antibiotic resistance of a bacterial sample. Due to a risk of contamination during transport, I'm not allowed to request a uniform ...
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Does the process of making a sourdough starter involve Darwinian selection?

In essence - to make a sourdough starter: Put flour and water in a jar, and leave it in a warm place overnight Divide the remaining mixture in half, throw out half, add half as much flour and water ...
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How effective is rinsing in removing microbes from surfaces

Microbes including viruses stay alive on surfaces depending upon the type of the surface like steel, wood, plastic, glass, marble etc. How effective is rinsing these surfaces with tap water in ...
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How quicky does dental pH change after eating?

I would like to know how quickly after eating I can expect the pH do change in my mouth, and how quickly this will cause dental damage. Obviously any answer to this will have plenty of caveats (diet, ...
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How is minimum infectious dose defined?

I'm a bit confused by the concept of a minimum infectious dose (MID). It seems from what my research so far has turned up, that while any dose greater than 0 could potentially cause an infection, for ...
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Can I find out what resistance bacteria has based on strain? where do I look for that info?

I have a list of strains across various organisms for example: Escherichia coli - ATCC 25922, CGSC 6152, W3110RL. Pseudomonas aeruginosa - ATCC 27853, PAO1, APAE1111. I'm failing to find any ...
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Optimal bacterial vegetative cell inactivation method(s) after subtilis spores germinated under pressure

I am writing a PhD research proposal and being a newbie in the field I am lost a little bit in the bacterial vegetative cell inactivation methods in foods. I should propose two main methods to my ...
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Is there a bacterium that became a virus?

Is it possible for a virus to be a descendant of a bacterium that was not through horizontal gene transfer? How I think this could happen: Suppose a species of bacteria lives in an environment where ...
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What are the methods to quantify the bacterial adhesion rate for the biofilms grown on coupons in CDC or annular bioreactor, non-invasively?

I'm interested to know that if I grow the biofilm on coupons in the CDC bioreactor at a particular shear stress, and after say 48 hours, I take out the coupon from the bioreactor to quantify the ...
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What is the protein composition of complete Freund's adjuvant?

The complete form of this adjuvant uses heat inactivated and dried mycobacteria. However, to rule out cross-reactivity with an antibody, I would like to know which proteins are left in the adjuvant. ...
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What is the principle behind Microagglutination test (MAT)?

Could some one please help me understand the principle behind the MAT. Also, is it only used to detect leptospira or can it be used to detect other pathogens as well? Kindly share links to papers if ...
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Is there a vaccine against the plague (Yersinia pestis)?

There seems to be recurrent events of infections of the plage (Yersinia pestis), from the well known Justinian plague to the Black Death and to recent years. In fact, two cases were reported in China ...
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How antibodies are produced in our body against intracellular proteins of infectious bacteria?

When an infectious agent invades our body, then surface antigens of the infectious agent are detected by our immune system and B-cells get activated. However, we do have antibodies in our blood ...
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Is there a critical size for a bacteria colony forming?

I am a maths student doing a project based on modelling bacteria and phages. In one of my models the bacteria population reaches a population size of ~450 cells. Would a colony of bacteria this size ...
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Growing Mouth Bacteria in a bowl of sugar water

I want to teach my nephew why brushing in necessary and how sugar in mouth reduced by bacteria to acid. I plan to put sugar mixed water in bowl and take swab from his mouth and dip in bowl, and test ...
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Why doesn't infection with Clostridium Tetani immunize you?

What Immunity to COVID-19 Really Means - Scientific American It is less clear what those antibody tests mean for real life, however, because immunity functions on a continuum. With some pathogens, ...
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I need to identify the genus of this colony just by its morphology, can somebody help me?

it was grown on TSA it's a mesophilic bacteria. (it was contaminated by E. coli, so ignore the clearer and smoother colonies).
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How to prepare bacterin using formalin(formaldehyde)

I am finding how much formalin I have to use to make bacterins for vaccine experiments. I searched for it in google but I can't find about specific procedures like the concentration of formalin and ...
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Can far-UVC light be safely used as germicide? (help understanding a paper)

I've been trying to familiarize myself with the literature on far UVC light as a germicide. My question mostly pertains to figure 4 of this paper. The paper investigates the efficacy of 207 nm light ...
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Is Klebsiella pneumoniae found in the throat of healthy people? [closed]

Is Klebsiella pneumoniae found in the throat of healthy people?
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Can virus and bacteria move on the surface? [duplicate]

Do viruses/bacteria have some motive mechanism? I mean if the virus/bacteria reach some surface by touching, can it move on that surface? Life example: suppose the cooler is not so clean and has ...
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How to convert AU/ml of bacteriocin into zone of inhibition in mm?

My questions is about measuring antimicrobial activity against bacteria on petri plate. Is it possible to convert or somehow get zone of inhibition in millimetre from AU/ml?
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Can viruses stabilize and increase the shelf life of wine and other foods?

When you make wine, you use the yeast Saccharomyces cerevisiae to ferment sugary juices. After you're done, you want to avoid them doing anything by using some chemicals etc. There are also other ...
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Relationship between bacteria size and temperature?

I'm, doing a research in a TOC (total organic carbon) degradation in a BAC (biologically active carbon) filter for the grey-water treatment. Recently, I started to wonder if there is a relation ...
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A question about microbes growing media

I was told in my microbiology course that blood agar can be put in GasPak system (anearobic) to grow strict anaerobes, but why would someone use blood-dependent bacteria in this experiment as these ...
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Salt water swish for dental health [duplicate]

I was wondering as to why warm water is told for salt water gargle and not cold water, does warm water has more therapeutic effect? Also does salt really work, excess salty water might kill bacteria ...
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Why do gram-negative bacteria attack the digestive system more than gram-positive ones?

I was researching for a biology project on the subject of contagious infections of the digestive system (mainly the intestines) and almost all of the bacteria that came up (E.coli, Shigella, Cholera, ...
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small airborne microorganisms, are in many instances attached to bigger particulate substances?

From https://biology.stackexchange.com/a/90193/56476 very small airborne microorganisms, are in many instances attached to bigger particulate substances in the air, whether liquid micro droplets or ...
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From a hosts point of view, which comes first, effect of toxins on pathways or identification of toxins by immune system?

From a pure biology perspective, when a pathogen (gram-negative bacteria) affects a host by secreting toxins, what comes first, the effect of the toxin on the pathways or identification of the toxin ...
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Does parasitism, one of Bacteria's lifestyle?

The parasite is an organism that lives in or on a host. It depends on its host for survival. Bacteria lives in decaying organic matter, within human organism (colon, oral cavity). It can be a ...

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