Questions tagged [bacteriology]

A subdivision of microbiology dedicated to the study of bacteria.

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1answer
52 views

Why gram-negative bacteria attack the digestive system more than gram-positive ones do?

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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Soil antibiotics [closed]

I know that many antibiotics are continuously formed by soil bacteria and fungi. So, how could we use raw soil without any treatment (in case of absence of modern technology) to treat infections?
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Immune response to IgA positive bacteria

If certain bacteria can be coated with IgA in vitro, does that mean they are likely to elicit an IgA immune response? Edit I'm working on a project that involves IgA-Seq analysis. Bacteria are coated ...
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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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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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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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45 views

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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2answers
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Could bacteria and phages be found in tissues?

in the literature, there are several studies of the gut virome and microbiome, for instance Reyes et al. on Nature (https://www.nature.com/articles/nature09199?error=cookies_not_supported&code=...
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Articles about 16s compositions between coral symbiotic bacteria and free-living bacteria

I am looking for an article I read in the past that mentions about difference in the bacterial 16s composition between coral symbiotic bacteria and free-living bacteria(living in the outer ocean) but ...
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1answer
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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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62 views

Home bacteria culture at home?

Can simple bacterial culture be done at home using food agar as the medium (with some additives found in the store)?
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How is the exogenous DNA protected from degradation during bacterial transformation?

During transformation, a bacterium can take up DNA from its environment. A small fraction of bacterial species are known to be naturally competent, meaning that they can engage in this sort of ...
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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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32 views

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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Why don't we build up an immunity to sore throat?

We often get sore throats once or twice a year, and it clears in a few days sometimes without any antibiotics. I was wondering why doesn't our body become immune after clearing a sore throat?
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Heat shock vs electroporation

I've been transforming E. coli via heat shock in order to insert oligonucleotides (around 50 nt); however, none of my experiments have given positive results so far. I begin to question the efficiency ...
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54 views

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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3answers
331 views

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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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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1answer
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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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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 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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1answer
34 views

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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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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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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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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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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3answers
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Blue light in a fridge. Is it really beneficial or just marketing?

Recently while visiting a shop with electronics I saw a fridge with a huge advertisment sticker going more or less like this: There's blue light source in this fridge so there will be less bacteria ...
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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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3answers
156 views

How do anaerobic bacteria produce ATP for their own cellular activities?

Anaerobic bacteria utilise glycolysis: Glucose + 2 P + 2 NAD+ => 2 ATP + 2 H + 2 NADH + 2 H2O + 2 Pyruvate followed by fermentation: Pyruvate + NADH => Lactate + NAD+ The resultant NAD+ formed ...
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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
74 views

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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1answer
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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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2answers
959 views

Is iodised salt harmful to the lactofermentation process?

I was discussing sauerkraut recipes with someone on IRC a minute ago, and they warned me not to use iodised salt in the process. My first (and so far, the only successful) batch is one I made with ...
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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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Can you design a bacteriophage that attacks the part of the bacteria that makes them antibiotics resistant?

I read in a newspaper about a case where they had found a virus that could attack a specific form of antibiotics-resistant bacteria and managed to save a girl from a certain death by "infecting her" ...
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What is the advantage of circular DNA in bacteria?

From what I understand, bacteria have circular DNA. What advantages does it have over linear strands like for eukaryotes? Do there exist bacteria with more than one ring of DNA?
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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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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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I found this in my refrigerator water filter. Is it a biofilm? Is it a sign of dangerous bacteria?

When I dispense water form my refrigerator after changing my filter, the following slimy tube like deposits appeared. Does anybody know what this is? Could it be a biofilm growing in the water hose, ...
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1answer
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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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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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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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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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