Questions tagged [bacteriology]

A subdivision of microbiology dedicated to the study of bacteria.

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30 views

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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31 views

Is Klebsiella pneumoniae found in the throat of healthy people?

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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28 views

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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Is bacteria capable to learn?

Are bacteria chemicaly guided or there is some kind of complex electronic system that let them learn the envirement?Thanks.
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Will all bacteria become resistant against all antibiotics in the long term?

(I asked the same at medicalsciences beta, but I expect a quite different perspective on it here) This is about bacteria that can infect humans, and their multi-resistance. The evolution of bacteria ...
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Air purifier agains bacteria and viruses?

We would buy a mobile air purifier in our home. Against the smoke of the city, etc. It would have a HEPA + activated carbon filter. They are marketing it as: "filtration process captures 99.97%...
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How can I propagate a community of anaerobic bacteria sampled from mud in a bog?

I'm doing research on anaerobic bacteria. In the fall I took mud samples from a bog and have been working with them but I didn't take enough. Now winter has rolled around (Im in Canada) and all the ...
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Could Cyanobacteria farms help dilute pollutants in the atmosphere

If I understand correctly, roughly ~2.8 billion years ago cyanobacteria started pumping large amounts of oxygen into the atmosphere. Using modern industrial processes could this be emulated by ...
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Can bacteria pick up lethal plasmids?

I am sorry if this question is too general, and does not have any concrete answer. I was explaining to my non-biology-background friend about plasmids and how they are picked up by bacteria from the ...
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How do scientists kill the bacteria they themselves made resistant?

I was reading this article on researching bacteria resistance to silver by removing some of their genes. Researchers then used "colony-scoring" software to measure the differences in growth and ...
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1answer
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How does a “chromogenic mixture” produce such pronounced color differences in this Agar Art?

The Forbes.com article Bacteria Become Art Tools In Annual Agar Art Competition says: ...People’s choice winner Zita Pöstényi, a microbiologist at SYNLAB Hungary Ltd, used three agar plates and ...
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Why is an antibiotic-resistance gene required during transformation of recombinant plasmid?

In my biology textbook, it said that in transformation, the recombinant plasmid containing an antibiotic-resistance gene act as a 'selective marker'. That means that plasmid in transformed bacteria ...
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91 views

A theory about the possible connection between protists and first animalia

I learnt that organisms within Kingdom Animalia can be either microanimals or (nonmicro)animals. a microanimal is any Kingdom Animalia organism that in general cannot be seen by a human eye without ...
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1answer
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What are the sizes of individual cells of the cyanobacterium Nostoc spheroides?

In this article Nostoc spheroids are described as edible blue-green algae, but they are mostly named cyanobacteria, which are prokaryotes. In the above and other articles about Nostoc spheroids only ...
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What's the meaning of the label MRE and a number like 162 or 600 in the names of bacteria?

I've stumbled across labels like E. coli MRE 162 or E. coli MRE 600 for different kinds of E. coli bacteria. What's the meaning of MRE and the numbers like 162 or 600 in this context?
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What is the simplest way to demonstrate the germicidal property of UV light?

This is intended for a high school project. I am familiar with the one that studies growth of e coli over time in a petri dish but I a bit concerned about as to how safe a demonstration of this nature ...
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27 views

Ideas for microbiology lab. Antimicrobial properties of cutting boards

I am an undergraduate student in Biology and I am trying to design a microbiology lab that will takes 3 weeks to carry out (1-2 day each week). I am going to examine the antimicrobial properties of ...
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Are controls needed for urine cultures?

If testing for bacteria (gram-negative) in a urine culture, are negative or positive cultures needed? I could not find anything that says controls are needed unless results seem to be contaminated. ...
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Neisseria meningitidis transformation into a pathogen

I read the wikipedia article about Neisseria meningitidis, and it says that N. meningitidis is a part of the normal nonpathogenic flora in the nasopharynx of up to 5–15% of adults In some cases ...
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Scientifically testing when milk goes bad

How could I test if milk has gone bad scientifically? Performing a taste test on the milk yields a subjective interpretation as to whether the milk is good or not. Is there any objective metric that I ...
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1answer
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Which bacteria takes the longest to double?

Currently I am writing a lab report on the enumeration of bacteria. E.coli takes about 30 mins to double. That is going from 1 bacteria to 2 bacteria. I want to know which bacteria takes the ...
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How can Haemophilus influenzae survive and grow alone in the human body?

Haemophilus influenzae gets its name from the fact, that it requires nutrients from blood in order to grow. More specifically, I see it mentioned that in vitro they often exhibit the pheomenon that ...
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Why is synthesis of tetanospasmin advantageous to C. tetani?

The tetanospasmin is a neurotoxin synthesised by some strains of C. tetani. It is the factor causing tetanus, but what is its role for the bacteria itself? I do not believe the main objective of C. ...
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1answer
46 views

How big can a colony/society get?

I hope this is the appropiate place for this question, asked from a math/physics perspective with little to no training in biology. Bacteria are very small and live in huge colonies, ants are bigger (...
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official authoritative source for bacterial shape classification

I'm a bit disappointed but after several hours of search, I could not find an official authoritative source for bacterial shape classification. I find a lot, I mean a lot of links but no original ...
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Bacterial Growth Formula

What are the units of $N$: the colonies of bacteria or the viable cell count? This is in regards to the bacterial growth formula used during serial dilutions, $$ N =N(0) e^{kt} \quad . $$
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Are PVC&PET bacteria found inside homes?

I am interested in weather PVC and PET eating bacteria can be found inside people's homes. The PET consuming ones were found in or near plastic waste dumps or in the ocean, but would they also have ...
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Are most pathogenic bacteria facultative anaerobes?

I know that S. aureus and most gram-negative rods are facultative anaerobes. In terms of number of species, are most human pathogen-associated bacteria facultative anaerobes?
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How many types of bacteria?

Bacteria are classifed on the base of food. Two types of bacteria, autotrophic and heterotrophic bacteria. Autotrophic bacteria that prepare own food or energy. Heterotrophic which cannot prepare own ...
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How do parasites “reprogram” brains?

Dicrocoelium dendriticum is a parasite that uses ants as a second intermediate host (which means that ants aren't its primary host/target, but are rather a temporary host to help reach their main/...
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What disease does Saccharopolyspora erythraea cause?

For an examination assignment I have to find a disease caused by the bacterial species Saccharopolyspora erythraea, but I have searched the internet and have found no report of patients being infected ...
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E. coli & aspartate

I am familiar with the linkage between aspartate/ligand binding, receptor methylation, and flagellar behavior re. style of locamotion, but I do not know what the bacterium does with the aspartate it ...
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74 views

Is bacillus strain 2-9-3 really 250 million year old?

I've read that in the last decade (I believe) some scientists discovered a microorganism, which they dubbed bacillus strain 2-9-3, in a crystal of salt that they think is 250 million years old and ...
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Are there completely self-sufficient autotrophs?

Are there completely self-sufficient autotrophs which can survive and reproduce indefinitely by consuming exclusively non-organic matter (plus energy from sunlight or thermal vents etc.)? I'm asking ...
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Do bacteria exist which live exclusively on non-organic matter?

Are there bacteria which consume exclusively non-organic matter? Meaning that they do not require organic matter from other organisms to stay alive and reproduce? A completely pacifistic bacterium. ...
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1answer
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How long can Legionella survive at 60°C?

I'm coding some stuff for water heaters and one of the functions is anti-Legionella. Anyway, I've read on wikipedia that 90% Legionella dies in first two minutes if the water temperature is 60°C, but ...
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What enzyme or bacteria could dissolve plastic?

What enzyme or bacteria could dissolve plastic aside from acetone? Preferably, low-cost and environmentally friendly. Any suggestions would be helpful. I'm targeting for thin plastic (low-density ...
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1answer
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Why is it possible to make yoghourt with lactose free milk?

The function of the Lactobacillus bulgaricus and Streptococcus thermophilus cultures is to ferment lactose to produce lactic acid. The increase in lactic acid decreases pH and causes the milk to clot,...
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Fermenting bacterial growth with potato dextrose broth

I am trying to propagate some strains of bacteria (L.Plantarum, B.Subtilis, L.Rhamnosus, B.Longhum, B.Bifidum) in potato dextrose suspension for my own consumption. I would like some guidance, ...
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29 views

Salt Bridge for Microbial Fuel Cell: Full or Partly Full?

I'm making a microbial fuel cell out of benthic mud and salt water in containers. My salt bridge will be made of agar and table salt solidified in PVC pipes. Does the salt bridge connecting the anode (...
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What are the survival conditions for Clostridium botulinum?

I notice that the incidence of poisoning from the activity of Clostridium botulinum is quite rare. For example, in 2015 there were only 7 incidents of foodborne botulism poisoning identified even ...

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