Questions tagged [microbiology]

Microbiology is the study of extremely small organisms. This includes organisms like bacteria, fungi, protozoa, and viruses.

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2answers
91 views

Can single-cell organisms have through-holes? (Are donut-cells a thing?)

I've watched a YouTube video about microorganisms, which featured a shot (below) of a single-cell organism, that looked like it had several through-holes in its body. Somehow I have a pretty steady ...
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3answers
342 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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1answer
821 views

What is meant by “complexity of carbon sources”?

My biology book states "life on earth depends upon carbon based molecules, most of these food sources are also carbon based. Depending upon the complexity of these carbon sources, different ...
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0answers
66 views

Can different Chromobactierum strains have completley different colony morphology?

In the analysis of an unknown bacterial broth I observed a gram negative rod genus. Upon plating I observed small, dark purple and convex colonies; corresponding presumably to Chromobactierum. After ...
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2answers
1k views

What is the meaning of multicellularity?

I can't understand what multicellularity is. Wikipedia states that any organism having many cells is multicellular. By this definition bacteria can also be multicellular. For example, cyanobacteria ...
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2answers
480 views

How does the microbial environment in your gut initiate?

Clearly, a zygote does not harbor any microbes. As it develops, and the alimentary canal tissue is differentiated, I logically assume that there is still no microbial activity in the fetus's gut. I'm ...
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2answers
5k views

Why don't we have vaccination against all diseases caused by microbes?

People can be vaccinated against certain diseases. Principle of vaccination is to use live attenuated load or inactivated. My question is - why we dont have vaccination against all diseases which are ...
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3answers
580 views

Rhizosphere vs. Endorhiza?

In relation to microbiology and the naming of the various areas of the plant as it relates to microbial inhabitance, I am confused as to the difference between the terms endorhiza and rhizosphere. In ...
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2answers
133 views

Are there any known microbes capable of living in almost pure carbon dioxide?

Some bioengineering is investigated in high carbon dioxide environments. Are there any microbes like bacteria or Archaea capable of living and multiplying in such environments?
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1answer
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Identification of black growth on onion skin

I have encountered this black-colored growth on onion skins a lot. It seems to develop over the course of weeks and I have rarely, if ever, encountered the material on fresh ones. If I peel the onion ...
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1answer
100 views

Where can I find a compendium of microorganisms?

I recently bought a microscope hoping to learn more about algae and bacteria and stuff. I've collected a few samples of pond water and found tons of algae and stuff, but I have no idea what to call ...
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0answers
43 views

How to grow a spirulina biofilm on a carbon/graphite cylindrical cathode?

I am trying to grow a spirulina biofilm on my cathode for a fuel cell but it doesn't seem to be sticking to the cathode. I have a culture of spirulina and I've submerged a few cathodes in it to try ...
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1answer
63 views

By what physiological mechanism do we not feel microbes (bacteria, etc.) living on our skin?

Background I know our bodies have a handful of ways to threshold our awareness of sensory stimuli: Neural density Sensory acuity I assume really tiny stimuli could fit between receptors e.g., ...
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30 views

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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1answer
42 views

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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1answer
55 views

What is the disadvantage of circular DNA?

I have searched online and there is little information about the disadvantage of a circular DNA. Since I know that with chromosome arrangement like human, we have telomere that held the DNA strands ...
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3answers
16k views

Ratio of bleach to water required to disinfect COVID-19?

I am confused about the needed ratio of bleach to water required to disinfect COVID-19 from surfaces. The guide on CDC states that: https://www.cdc.gov/coronavirus/2019-ncov/community/home/cleaning-...
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1answer
71 views

Why do coliform bacteria smell so bad?

I have done multiple cultures of E. coli bacteria and related species over the course of my education. Almost every time, they had this revolting smell. However, other organisms used for genetics ...
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1answer
173 views

Why don't what I can define as “aerophilic viruses” establish colonies?

Throughout my life I have seen some bacterial and fungal colonies in various sizes and colors, mostly on food or in hot humid dirty environments. Putting bacteria and microfungi as well as other ...
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1answer
4k views

Antibacterial soap impacts on septic system?

What impacts do antibacterial soaps have on septic systems? I know that septic systems rely heavily on bacteria (especially regarding the breakdown of wastes by bacteria), so it seems as though ...
22
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2answers
37k views

Why is 70% ethanol preferred for aseptic techniques?

Are other concentrations (say 80%) less effective,or is this just for convenient manufacturing? Is the concentration chosen only because it is less volatile than 100 percent ethanol and hence safer?
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1answer
36 views

How are antibodies specific for a disease detected in the blood if everybody produces a different antibody for the same antigen?

To break the title down into parts: There exist serology tests that detect the amount of an antibody (Ab) against a specific pathogen/antigen. Every human produces their own Ab for a specific ...
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3answers
2k views

Are viruses self-propelled?

So obviously, viruses are nonliving. But when my teacher was teaching viruses in the video (we're doing "flip" learning this semester), the way he described it, it seemed like the viruses responded to ...
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0answers
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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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0answers
158 views

Paper shows 2 hours of high humidity and hot temperatures kills corona virus, does this stop the spread of the virus?

I found this paper (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2863430/) which says these corona virus strains live for months at 4 degrees C, 20% relative humidity. But at 40 degrees C and 80% ...
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0answers
27 views

Commercially available chemically competent cells with LacI deletion?

I'm looking for a chemically competent cell line that I can purchase that has the LacI transcription factor deleted from its genome. Many have the lac operon deleted (B-galactosidase, i.e. LacZ is ...
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1answer
57 views

Can you increase the microbiota in an insect?

I know you can suppress the microbiota of an insect with antibiotics, but I´m am looking for a way to increase it. For example, can I feed an insect with something that helps boost the bacteria like ...
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1answer
128 views

Why is it common to grow microalgae in bottles or canisters?

I came across many people growing Chlorella or Spirulina types of microalgae, inside bottles or canisters and that that they also bubbled CO2 into these containers artificially. This question is ...
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0answers
77 views

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 ...
2
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1answer
102 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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0answers
20 views

sperm reaction of virus infected

we know when a human body cell infected by a virus , create interferon 1 to call other cells that surrounded it , but red blood cells couldn't do this because they loose their nuclear and other ...
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0answers
29 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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1answer
43 views

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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0answers
15 views

Where can I obtain Sputnik virophage samples?

I'm working on a project where I'm trying to use virophages as viral vectors in introducing CRISPR-Cas proteins into other viruses. I was wondering where I might be able to find replication-defective ...
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0answers
24 views

A question about dicumarol

I know that dicumarol was discovered in moldy sweet clover as it caused hemorrhage in cattles, but if someone had thromboembolic disorders causing uncontrolled thrombosis,would it be fine to eat moldy ...
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0answers
40 views

Virus Mortality Selection

This question is related to the recent Wuhan outbreak. Currently, mortality rate for the virus is somewhere around 2-3%. This is much lower than say, SARS (9.5%) and MERS (34.5%). As a thought ...
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1answer
539 views

What concentration of hydrogen peroxide kills mold?

There are numerous articles online which claim that household 3% hydrogen peroxide can kill mold growing on household surfaces, yet I haven't managed to find scientific studies that show that. My ...
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2answers
66 views

What's the purpose of segregating a virus from the blood and growing it in the lab?

I heard that the scientist in Australia found a way to segregate the 2019 NovCoronovirus from the blood. Does this mean they are one step closer to the cure? Why is virus segregation crucial in ...
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1answer
100 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
50 views

Is PrEP used for anything other than HIV?

In the field of HIV prevention, PrEP is an abbreviation of pre-exposure prophylaxis. This is a very generic term. Are any diseases other than HIV prevented using a similar approach? Do they use the ...
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1answer
1k views

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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1answer
46 views

What are the constraints on an operon?

From what I understand, the term operon is loosely defined to be a collection of genes that are found to be in the same proximity in a genome. Some definitions enforce that an operon is only ...
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1answer
51 views

Water sample preservation

I am taking my students to collect water samples from different bodies of water. These bodies of water include the local river, a park pond, and water accumulation from recent rain. Once we gather the ...
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2answers
427 views

Does avoiding medication that alleviates symptoms shorten the length of a cold?

People use over the counter (OTC) medications to relieve symptoms of the common cold. However, these symptoms are part of the immune response, right? They are driven by the body responding to the ...
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0answers
41 views

What makes iodine an effective antiseptic?

I'm thinking about tincture of iodine, potassium iodide (Lugol's), and povidone-iodine (PVP-I) specifically, which, as is my understanding, work by solubilizing elemental iodine in an aqueous solution....
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0answers
64 views

Can microbes become “overweight”?

Just out of some weird thoughts, can a microbe (any single-celled organisms, accepting answers for both prokaryotes and eukaryotes) ingest too much food (e.g. via absorbing too much involuntarily ...
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2answers
218 views

How do we know that mild forms of rabies are nonexistent?

Wikipedia's rabies article says: "Death usually occurs 2 to 10 days after first symptoms. Survival is almost unknown once symptoms have presented, even with the administration of proper and intensive ...
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0answers
19 views

Using a magnetic stirrer as a makeshift shaking incubator?

I'm working in my high school's lab and need to culture bacteria in a broth culture. More specifically, I'm trying to harvest Bacillus endospores with the exhaustion method published in "Molecular ...
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0answers
90 views

Why did isopropyl alcohol not work as a disinfectant for E. coli in this experiment?

I recently performed a lab to test different concentrations (20-99%) of isopropyl alcohol and its inhibition of E. coli growth. My control was an antibacterial disk, and what I did was I dabbed the ...
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1answer
184 views

Why do archaea survive better in extremes than bacteria?

Why have bacteria not evolved to fill the extreme environments to the same extent as archaea? What has enabled archaea to colonize these areas when bacteria do not?

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