2
votes
1answer
16 views

How common is it to be pregnant with periods?

As you may know, some women claim that they have their period while they are pregnant. In the arab world they call it "Deer pregnancy", since when the deer gets pregnant, it still gets its' monthly ...
0
votes
0answers
5 views

What is the function of ferredoxin?

In the following reaction what is the function of ferredoxin? As I recall from anaerobic respiration as there is no oxygen to act as the final electron acceptor Lactic Acid or Ethyl Alcohol is ...
2
votes
2answers
68 views

“Same” DNA vs genes

It is often cited that humans share 99% (or 98%) of their DNA with chimpanzees. On the other hand it is stated that siblings share only half of their genes. What (if any) is the difference between ...
1
vote
0answers
38 views

On the mechanisms of cellular growth [closed]

Is there such a thing or process of 'forced cellular' growth that is initiated within a biological system 'W' where it could cause cellular growth and/or repair where it is not 'normally' required ...
2
votes
2answers
37 views

Do women experience more bonding hormones than men after sex?

Does Oxytocin (or any other bonding hormone) increase more so for women than for men after sex? Someone told me that it increases 4-fold for men and 12-fold for women (unconfirmed). Is there any ...
3
votes
1answer
14 views

Why are there so many sex determining systems in animals

There are several sex determining systems in animals. In mammals XY = male(except in rare cases where SRY crosses with genes on the X so that it is the reverse) and XX = female. In some birds it is ...
5
votes
1answer
749 views

Facultative Cannibalism?

I heard about Larger cats eating the cubs. Is it some kind of facultative cannibalism or they can eat there own kind like that? What are the facultative cannibalism present in animal kingdom? What ...
2
votes
1answer
17 views

Teens concerned about impregnation through clothes

How active are you online? How much do you browse the internet? I was surprised to see that many teens ask the same question regarding what is called Dry Humping, which, in definition is: dry ...
3
votes
1answer
21 views

Why does the sacrum fuse together?

Everywhere I look describes how the 5 sacral vertebrae start fusing together during adolescence and are totally fused by the time you're 30 or so. But nobody seems to explain why this happens. It ...
1
vote
0answers
13 views

Need project Ideas in Molecular Phylogenetics

So I have a project student (undergraduate) who has been assigned a project to study the evolution of a gene (and possibly related genes) through species. I am not an evolutionary biologist, and hence ...
1
vote
1answer
42 views
+50

Breakdown of energy expenditure at the level of a single cell

The metabolic rate measures how much energy an organism expends over a unit of time. Its breakdown for the human body in terms of its functions is well documented : so much for the heart, for the ...
2
votes
0answers
26 views

Viagra for pain management

Not all men who take Viagra experience any sexual side effects about 40% have no change of sexual abilities on the pill. However like many women the drug in such cases cause a strong pain reduction ...
2
votes
0answers
44 views

How are new staining protocols designed for microscopy? [on hold]

How are new staining protocols designed for microscopy? Is it manual work or does it rely on computer simulations? Say for example I thought the H&E staining does not bring enough contrast. How ...
1
vote
1answer
10 views

Differentiating Taenia solium and Taenia saginata Infections

I have been told that both are spread by pigs and cattle, respectively. I would like to know the complications caused by Taenia solium and Taenia saginata. Also elaborate how dangerous is one as ...
2
votes
1answer
23 views

How do taenia form a species?

I know that there are many hermaphrodite animals and plants. But many of them seem to still exchange genes by mating with another member of their species. I now happened to read the Wikipedia ...
4
votes
1answer
57 views

Is there differences in components of saliva among species

Are there differences in the components of saliva among species? Also, do the functions of saliva differ between species?
2
votes
1answer
28 views

What is wrong with this analogy: Individuals are to alleles what governments are to individuals

I'm an amateur when it comes to genetics, I'm hoping to learn something from the corrections. I am taking epigenetics into account (kind of); all 3 entities are susceptible to external physical ...
2
votes
1answer
22 views

How to operate a microtome?

In the picture above (Source: Amazon.com, United Scientific MCT001 Hand Microtome) we can see a microtome. How is it operated?
2
votes
0answers
19 views

Isoprene and Acrolein emissions of wood burning, insect burning and smoldering tobacco cigarette

I'd like to identify what makes a fume more or less toxic, above all those from commonly smoked organic stuff: tobacco, cannabis, comparatively to less common ones. For that, we can focus on 2 gas ...
8
votes
1answer
83 views

How can flies sense mirrors?

I've noted that flies in my house have no problem landing on even perfectly clean mirrors. Why don't they fly straight into them? Can they sense that there is a surface there, even though they can't ...
4
votes
4answers
161 views

What kind of microscope for ML/biological research?

I am a computer science student, focusing on machine learning applications. I have been always interested in biology but I lack any training in it. Now, I had an idea that I could introduce myself to ...
3
votes
1answer
38 views

Erythroblastosis Foetalis

If Rh- mother has Rh+ baby, the mother can become sensitized during first pregnancy and then if subsequent fetuses are also Rh+, there can be eryhtroblastosis foetalis. I read that if mother is O- ...
2
votes
1answer
30 views

Stem cell that can pass through blood vessel

I know that blood cells can pass through the smallest of capillaries, but I was wondering is it possible for stem cells to pass through the smallest of capillaries? In other words, is it possible for ...
4
votes
2answers
301 views

What happens to lactic acid I eat?

Let's say I drink some Kefir Milk, what happens to the lactic acid in the Kefir Milk that has entered my digestive system?
1
vote
1answer
35 views

What Effect would Cannabinoids have on the Acute Porphyrias?

I should be clear in saying that this question is NOT intended for personal medical advice. Rather what I am looking for is journal articles and/or books that touch on this subject because I think it ...
1
vote
1answer
186 views

What is the effect of extra-cellular potassium concentration on heart rate and conduction velocity?

If the extracellular potassium concentration surrounding a myocyte increases, then the potassium gradient accross the cell membrane decreases, and therefore the resting membrane potential will become ...
3
votes
1answer
21 views

How can a plant resist glyphosate (Roundup) herbicide?

In my area, the most common weeds that strongly resists (N-(phosphonomethyl)glycine) (glyphosate) are the horseweed, or mare's tail, Conyza canadensis, and Canada thistle, Cirsium arvense There are ...
2
votes
1answer
45 views

Mesoporous silica particles as anti cancer drug delivery method

If this question is a little off topic for Biology, I'm sorry. I've recently read a lot about mesoporous silica nanoparticles as a promising drug delivery method. The huge range of customizability of ...
5
votes
1answer
30 views

Braquio-abduction illusion explanation and references

Illusion: Lying down on a hard flat floor move arms up and down (as when doing a snow angel) while keeping them touching the floor. While repeating it a few times the floor begins to appear concave, ...
3
votes
1answer
378 views

Why is funnel web spider venom so lethal to humans and not so much for other mammals?

According to the information from this article, People and other primates are exquisitely sensitive to funnel web venom but, intriguingly, other mammals such as mice, rabbits, guineapigs, dogs ...
4
votes
1answer
37 views

Scale up of Bacterial growth from 250mL to 1-5L?

I am currently growing up a specific strain of E.Coli with a knockout in 40mL of growth medium (LB) in a 250mL shaker flask... My ultimate goal is to scale up this process to a 1-5L large scale setup ...
9
votes
1answer
1k views

On the genetics behind caste marriages

I am in India where it is typically a custom to marry within one's caste. Basically the caste system originated with roots in people's professions - Each of priests, carpenters, troupers, etc had a ...
0
votes
0answers
6 views

Why doesn't the herbicide 2,4-D damage lawn grass?

I sometimes use 2,4-Dichlorophenoxyacetic acid to control broadleaved weeds in lawns. It is selective, and quickly kills the dicot weeds, while other plants are unharmed. 2,4-D is a synthetic auxin, ...
0
votes
0answers
3 views

Why doesn't Fenoxaprop-P-ethyl damage cool season lawns?

For controlling bermudagrass, Cynodon dactylon, a serious perennial grassy lawn weed in my area, I use the herbicide Fenoxaprop-P-ethyl. It kills the bermudagrass rather well, without damaging the ...
1
vote
1answer
27 views
+50

What is the difference between drought resistant non-succulent plants and plants that cannot be allowed to dry out?

What features make one plant able to withstand dry spells better than another with relatively similar structure? For instance, one of my Rudbeckias is wilting from drought at the moment, and an ...
3
votes
2answers
60 views

How to use Autodock just for (re)scoring

I have some protein-ligand complexed that I have been docking with some other software and just want to use Autodock to evaluate those complexes. So, basically I just want to use it as a scoring ...
3
votes
1answer
35 views

Hypersensitivity Simultaneously in Ear canals

I got experimental data where hypersensitivity (i.e. tonic pain when touching ear canal) was recognised for about 100 minutes. I do not know which type of hypersensitivity is this one. IgM can ...
5
votes
2answers
189 views

Can humans transdermally absorb minerals from ocean water, and if so how much?

According to several studies quoted here, chemicals can be absorbed by the skin transdermally, at least under certain conditions. When it comes to elements in seawater like sodium, magnesium, ...
8
votes
2answers
48 views

What are the ecological effects of moderately high and prolonged concentrations of nitrogen deposition on an ecosystem?

There are many sources of nitrogen which eventually get deposited out of the atmosphere and onto the land/surface. Typically higher levels of nitrogen compounds are emitted near urban and roadway ...
2
votes
1answer
39 views

How much divergence would be needed for classifications as astrobiology?

It is possible that life has invaded mars or the moon by way of probes rovers and other man made tech. How many years or generations of sequential and phenotypical diverge would be necessary to ...
2
votes
0answers
26 views

Where do the 31 spinal nerves start/meet?

Which part of the brain is the first place (from top to bottom) where all 31 pairs of spinal nerves (on each side) meet? Or if they all start at one place - where is that? Nominally, the beginning of ...
2
votes
1answer
20 views

How do processes of one osteocyte establish contact with processes of the adjacent cells within the mineralized matrix?

Are the processes and canaliculi formed and contacts established after the osteocytes are embeded in the matrix or are they formed during the embedding process itself. Is there any evidence to suggest ...
2
votes
1answer
62 views

What happens during a Raynauds episode?

Raynaud's phenomenon can be a serious health issue, as the blood flow to the extremities, mainly the fingers is compromised, causing fingers to blanche, and then turn blue. Severe Raynaud's can cause ...
2
votes
1answer
122 views

Why doesn't Diabetes cause death by starvation?

The main cause for diabetes is lack of insulin in the body. Insulin is the hormone that allows body cells to absorb glucose from the blood. With out insulin, the body cells can't get glucose from the ...
1
vote
4answers
54 views

Why is too much glucose harmful?

I learned the citric acid cycle in biotechnology school and how cells work; about ADP and ATP and how the Cellular respiration (C6H12O6 + 6O2 -> 6CO2+6H2O) works. I am interested in understanding why ...
4
votes
1answer
48 views

Does a non-extinct gliding species of bird exist?

According to wikipedia was Archaeopteryx rather glider than capable of active flight. As a hunting strategy it crawl up to a tree (or other high positioned place) and glide from it to a prey. Most of ...
2
votes
1answer
31 views

Why does a housecat (or other predator) play with it's food before killing and eating it? Does it make the food taste better?

I've read a couple people theorize that a cat playing with a mouse causes the mouse's body to be flushed with adrenaline before the final kill and that this adrenaline makes the meat more ...
1
vote
1answer
59 views

Identifying structures from anterior end of dissected prawn

Note: This image might be disturbing. I want to know what the red and the black structures (directly posterior to the red structure) are. I guess it's the heart.
5
votes
1answer
42 views

Implications of what the discovery of Naia means

Recently a discovery was made of a ~12,000 year old girl in Hoyo Negro in Mexico. This has been covered by many different news agencies. I'm confused however by many of the reports. Does it ...
0
votes
1answer
30 views

About molecules and their shape

When a molecule is being used in some biochemical process it has a certain 3-d structure. Is this maintained throughout it's usage or can one specific molecule change it's 3-d shape while it is being ...

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