All Questions

0
votes
0answers
16 views

Book-recommendation: Economic Zoology

I need to have a book which covers following topics two may also be fine: (a) Apiculture, sericulture, lac culture, carp culture, pearl culture, prawn culture, vermiculture. (b) Major infectious ...
0
votes
0answers
12 views

When we vomit how are the contents transferred to stomach/esophagus?

For example if a neurotoxin is to be flushed out through vomiting, it will be absorbed into blood and then sent to stomach/gut. Where does this transfer from blood to gut occur?
5
votes
2answers
44 views

Problems understanding membrane potential

I understand that membrane potential is the difference of the extracellular and intracellular ionic charges, due to their concentrations. We say that the extracellular space has a charge of 0 and then ...
1
vote
1answer
28 views

Understanding intra and extracelullar concentrations (membrane potential)

I have 4 question (not homework) What happens to the cells membrane potential if: a) Na+ outside rises by 40mM b) K+ inside rises by 10mM c) K+ outside rises by 10mM d) A- (impermeable ion) ...
3
votes
1answer
27 views

Exon skipping in mammals

I've heard from several sources that the predominant form of alternative splicing (at least in mammals) is exon skipping. However, my personal evidence is only anecdotal: I've heard it and read it, ...
0
votes
0answers
29 views

Cost of Substitution explained

I've recently come across an article that mentions "Cost of Substitution" and was wondering if someone can give me a real layman's term explanation of what that is. (Edited:) This was in relation to ...
5
votes
0answers
43 views

Why can you not tickle yourself?

It's the age old question, why can't we tickle ourselves? If you rub your fingers along your skin, sure there's sensation but you don't break down into a laughing fit (at least I don't :P), if someone ...
21
votes
2answers
9k views

Where do migratory birds go when it rains?

I was reading a comic from XKCD which inspired me to ask this question: "well, where do they go when it rains?" I know that when it rains you usually don't see any birds flying through the sky. I ...
2
votes
1answer
42 views

What are some of the general characteristics of the DH5 alpha strain?

I can not find some useful sources unfortunately. Please tell me about some important characteristics of DH5 alpha. What makes DH5 alpha suitable for the gene cloning?
0
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0answers
6 views

Frequency response of auditory system of the moth

This paper describes the dynamic behavior of moth auditory system. I was wondering at what frequencies range (roughly) does the moth auditory system produce little or no response to ultrasonic ...
2
votes
1answer
34 views

Why can't we smell our own bad breath? [closed]

Why can't we smell our own bad breath. Is there any way we can do that?
0
votes
1answer
20 views

Cardiac Excitation Threshold - in C++ modelling [closed]

So I am trying to write a code in C++ about the cardiac excitation threshold. I know that this excitation threshold is the shortest stimulus2 value at which it can conduct an action potential (known ...
1
vote
1answer
273 views

Do plants absorb toxins from the soil?

Consider a plant like Aloe Vera that grows up in a toxic environment where the concentration of pesticides, and materials like lead, mercury, cadmium, arsenic etc is very high(e.g. Marshland dumping ...
1
vote
1answer
56 views

Why is it called “Ebola virus disease”, not just “Ebola” or “Ebola disease”?

Why do scientists (pretty consistently) call it Ebola virus disease, rather than just Ebola, or Ebola disease? Many other diseases are caused by viruses, but they don't seem to have this detail of ...
0
votes
0answers
11 views

Is there a known glucosepane cross-link breaker?

I read the following on wikipedia: There is, however, no agent known that can break down the most common AGE, glucosepane, which appears 10 to 1,000 times more common in human tissue than any ...
5
votes
1answer
37 views

What (if anything) about tuberculosis makes producing a highly effective vaccine difficult?

What about tuberculosis makes it difficult to produce a safe vaccine that is effective at producing an immunogenic response in >99% of individuals against all strains of the bacteria? I am aware of ...
1
vote
3answers
74 views

Why is it better to drink room temperature water instead of cold water?

My teacher told me that drinking water that is room temperature is better for you then drinking cold water, but she did not tell me why that is. I want to know because I often drink cold water (with ...
1
vote
0answers
18 views

A history of infectious diseases [closed]

So I'm thinking about the Ebola outbreak. I'm wondering is this something that can be contained? Will this disease ultimately become a pandemic without a vaccine becoming available? The response I'm ...
1
vote
0answers
21 views

How easy is it to detect most vitamins' concentration from a handheld device? [closed]

How easy is it to detect most vitamins' concentration from a handheld device? I am wondering why didn't something like that get created yet? Do tests to detect vitamins differ significantly from one ...
-1
votes
0answers
16 views

Dog with failing vision - how can we help [migrated]

Our border collie is getting old. Her eyes are beginning to fail and there are clear signs of cataracts. She seems to sometimes feel stressed when she encounters stripes of contrasting colours. ...
2
votes
0answers
30 views

Are some facial features more important than others in human facial recognition?

I'm often surprised by the human ability to correctly identify other individuals despite significant modifications due to ageing, hairstyle, injury etc. But, sometimes the addition of a beard and a ...
1
vote
1answer
31 views

What insect is this on the photos?

What insect is this on these photos? Found in Russia in the living room.
4
votes
1answer
43 views

Why is the ebola virus so intense now?

So i'm looking into the ebola crisis and it seems the death toll is really getting crazy. I understand that it's a cytomegalovirus and that it basically overwhelms the immune system due to it's size ...
1
vote
1answer
8 views

Can inverted microscope also be phase contrast microscope?

I've read somewhere that inverted microscope also allows phase contrast microscopy. Is that true? Do all inverted microscope have this ability? Do they have any other functions? Many thanks in ...
0
votes
1answer
18 views

Is the brain functionally symmetrical?

I understand that each half of the human brain handles different parts of our thinking. Left brain, right brain, that whole topic. But in pictures, the brain is always depicted as having symmetrical ...
2
votes
1answer
21 views

How isolated are different areas of the brain?

I'm interested in understanding how isolated different parts of the brain are from each-other. I'm trying to understand the way that different sections of the brain work together. More specifically, ...
2
votes
1answer
23 views

Why is coconut oil healthier when it has so much saturated fat?

I noticed that coconut oil has ~96% saturated fat, and I was under the assumption that saturated fats = bad for health. Why is it that coconut oil is healthier to alternatives with much less ...
3
votes
1answer
29 views

How can ingesting a prion “infect” someone?

That's something that's been bugging me for a while... Our gastrointestinal tract produces proteases that degrade proteins. Prions are proteins. Shouldn't they be broken by proteases? Also, how can ...
1
vote
0answers
13 views

Can sealed epiphyseal growth plates theoretically be restored via epigenetic or genetic methods?

I know that epiphyseal growth plates seal up once people become young adults and that it is currently impossible to restore them to actively produce new bone growth but, is it theoretically possible ...
5
votes
1answer
72 views

How does the brain avoid feedback loops?

The article Ants Swarm Like Brains Think really helped me to understand the way that neurons which are pretty dumb on their own (like ants) can work together to create a pretty genius system (a brain ...
1
vote
3answers
37 views

Can connections between neurons be weakened?

Connections between neurons are said (by Wikipedia) to be strengthened as part of learning - can they also be weakened (below the original level)? I understand the concept of the connections ...
1
vote
1answer
21 views

Gene duplication and subfunctionalization

I’ve been intrigued by gene duplication and want to learn more about it. I’ve read the following from here: several studies suggest that the proportion of duplicated genes retained in ...
3
votes
0answers
15 views

Gibson assembly - primer design with A and T rich regions

I have question about Gibson assembly. I have done it several times and it always worked okay for us, but now I want to assemble together a fragment which has sequence like this: ...
1
vote
1answer
17 views

Are there multicellular isogamous species?

Are there multicellular isogamous species? Seeking through the examples of wikipedia I would tend to think that there are no multicellular isogamous species.
2
votes
0answers
25 views

Ancestral states of sex determination system

Most (maybe all?) species that reproduce sexually have either genders (anisogamy) or mating types (isogamy). There exist today many different type of sexual determination system. There is a whole ...
2
votes
0answers
16 views

What is most ancestral: isogamy or anisogamy?

Sexual reproduction can be feasible with anisogamy (gametes of different sizes i.e. genders) or isogamy (gametes of same size i.e. mating types) or with undifferentiated gametes (i.e. true random ...
0
votes
1answer
24 views

What is frank dehydration?

On Wikipedia article about Urine specific gravity we can read: A specific gravity greater than 1.035 is consistent with frank dehydration. What is frank dehydration? How it is different than ...
0
votes
0answers
20 views

Is Canine teeth enough evidence to prove that one is a Carnivore?

This question does not assume that we are meant to be carnivores in the first place; In fact I have no idea to which category we belong to anyway! There are several posts online indicating that ...
0
votes
0answers
16 views

Best method to culture lung fibroblasts?

I am just looking for the best method to culture human lung fibroblast from a needle biopsy?
0
votes
1answer
22 views

Does adding antibiotic after 5-10 mins of innoculation affect the protein yield or growth?

I've asked a lab colleague the same question. She said, it would loosen the bacterial cells in the LB medium and plasmids would come out. Is that true? and why?
2
votes
2answers
24 views

Localization of Protein Kinase-A

Is protein kinase-A located in the cytosol/cytoplasm of cells or in the plasma membrane? Also, is it considered a receptor molecule since it is dependent on cAMP? Any and all help is appreciated. ...
1
vote
2answers
31 views

True or False: Vaccines are designed to protect against invaders that are encountered rarely, not all the time

I read the following statement in this article: Vaccines are designed to protect against invaders that are encountered rarely - not all the time Is it true? If yes, why?
0
votes
2answers
63 views

Is it possible for a child to grow taller than their tallest parent?

I have heard that off spring can't grow taller than either of their parents but I've also heard that sometimes some gene activation can skip generations. Is it possible for a child to grow taller than ...
0
votes
1answer
24 views

How do colds and flu not infinitely recur?

I'm in my third week of university, and a large number of people I know, including myself, still have "fresher's flu", which is probably just a cold and a cough. My lectures are constantly punctuated ...
3
votes
2answers
23 views

What would happen if there were no SOX9 in an XY human?

Would testes be produced? If SRY is functional, can it produce other proteins that can direct the production of testes, which may or may not be sterile?
0
votes
0answers
30 views

Why are there no animals with a length greater than 30-40 meters or with a mass greater than 200 tonnes?

The biggest and heaviest aquatic animal is the blue whale: 30 meters long and a mass of 200 tonnes. The biggest and heaviest terrestrial animal was a Sauropod (plant-eating, long-necked dinosaur): 40 ...
0
votes
1answer
34 views

Is the innate immune system capable of identifying all foreign antigens?

I've been studying immunology on my own lately and I would like to know if the macrophages and the other components of the innate immune system are capable of identifying all foreign antigens. As far ...
2
votes
1answer
37 views

What is the result of meiosis?

Is the result of meiosis ONLY the sex gametes (male and female) which later meet to form a somatic cell? Sometimes I feel as if my book is hinting towards meiosis is the process where sperm cells meet ...
5
votes
1answer
83 views

Effects of selection on effective population size

Background The effective population size ($N_e$) is a central concept of evolutionary biology and is influenced by several parameters. For example: sex ratio bias affects $N_e$ $\left(N_e = ...
0
votes
0answers
16 views

Recovering Coma patient with theoretical full knowledge of heart function

In coma, there is the medullary depression (stage of agony). Spontaneous respiration and circulation cease i.e. vasomotor center. There is no full circulatory and respiratory support. Assume you ...

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