-2
votes
0answers
19 views
4
votes
1answer
396 views

Why does a light object appear lighter in your peripheral vision when it's dark?

So, I am not sure I can reproduce it via images, but the steps are: 1) At night, open a window and have a look at the surface of the earth 2) Suppose there's an object that reflects a tiny amount of ...
-1
votes
0answers
11 views

Haplotype reconstruction [closed]

Hi I'm doing a project on algorithms for haplotype reconstruction. However, I can't find a clear explanation for what exactly haplotype reconstruction is, and what needs to be optimized. Can someone ...
1
vote
1answer
48 views

I found these skulls in a old bottle in the woods. Can you tell me what they are?

Can you help me identify these skulls I found in an old bottle in the woods?
7
votes
1answer
78 views

What creates the feeling of 'excess' blood pressure to an area of the body?

If I hang upside down, and feel blood rushing to my head, what structures are actually responsible for me "feeling" this excess flow of blood? Baroreceptors? Mechanoreceptors? Something else? ...
3
votes
2answers
70 views

What is biological dark matter?

I recently stumbled upon the Biological Dark Matter wiki page. Its pretty light on details, but it appears to be genetic material found in humans that doesn't fall into currently classifications. ...
-3
votes
1answer
36 views

Vascular structures that cause pressure under ears

Please note: This is not homework, I am a developer trying to understand the basic workings of vascular (and other) structures running underneath the human ear as part of a side project. Observe the ...
0
votes
1answer
22 views

Do all sources supply all sinks on a plant?

Sources include any exporting organs, typically mature leaves, that are capable of producing photosynthete in excess of their own needs. Sinks include any nonphotosynthetic organs of the ...
1
vote
0answers
13 views

Why sudden stresses cause stuttering and/or other impairs in children?

The question is simple: Why sudden stresses cause stuttering and/or other temporary or permanent impairs in children (and even adults)?
6
votes
1answer
228 views

Are sensory receptors neurons?

Background There are many receptor types in the body, with various functions and various mechanisms of transduction. Receptor cells are considered to be part of the peripheral nervous system, as they ...
0
votes
1answer
31 views

Why does an complete molar pregnancy not result in a clone?

Complete molar pregnancy is one where an ovum devoid of nucleus is fertilized by a sperm after which the haploid set of chromosomes double to form a diploid set. As far as my understanding extends if ...
4
votes
2answers
37 views

what does Pro→Glu substitution mean?

Considering the paper: A single amino acid in E-cadherin responsible for host specificity towards the human pathogen Listeria monocytogenes in the abstract portion, what does Pro→Glu mean? Does it ...
1
vote
0answers
25 views

Is it possible that weak memory is due to interference between signals in the brain?

"Weak memory", as used in this question, refers to the inability to retrieve a memory that a person otherwise knows he has memorized earlier. An example of this is some fact snippet that the ...
8
votes
2answers
98 views

How can action potentials be generated through thoughts?

I think I understand how a signal is transferred from neuron to neuron (from How do the brain and nerves create electrical pulses?). My question, however, is not about the standard textbook material ...
1
vote
1answer
21 views

Is it possible for a human to get rabies from a rabies vaccine meant for dogs?

What would happen if a human was injected with a rabies vaccine meant for dogs? I know vaccines can contain weak or dead strains of the virus, but is it possible that the human could become infected ...
6
votes
1answer
32 views

Has the protein composition (with identification) in honey and other honeybee byproducts been studied?

I am interested in studying honey and other honeybee byproducts. I have not been able to find sequence or structure records for any of the contents of honey. In particular, I want to study the ...
3
votes
0answers
62 views

How close to Earth's core can organisms live?

We don't to know much about organisms living deep below the Earth's crust. Recently a team led by S. Giovanni discovered some microbes 300 m below the ocean floor. The microbes were found to be a ...
0
votes
0answers
17 views

Does DNA Ligase look for complementarity in sticky ends?

Can DNA ligase seal two non-complementary sticky ends if the reaction is incubated at the optimum conditions ? I do almost 100% double digestion in the lab. However, during ligation, when I do a ...
4
votes
1answer
153 views

Relationship between nerves and axons

I just wanted to get a realistic viewpoint of our nervous system. I understand arteries and veins, but I wanted to know how similar our nervous system is to that? I understand we have neurons ...
5
votes
1answer
42 views

How does food intake affect medicine? Why pill instructions recommends taking them before (after) meal?

Even simple vitamins seem to have this in the instruction. Why is is so? Is there some simple model of how do pills interact with food? Does it depend on the food type? (What about drinks?) Should ...
1
vote
0answers
37 views

Why do plants produce so much more sugar than they use?

I recently asked the question, "Do plants need O2 to consume energy they've stored via sugar?" to which @canadianer responded, "Yes, plants require oxygen to generate ATP from sugar. However, they ...
0
votes
1answer
22 views

Do plants need O₂ to consume energy they've stored via sugar?

This question came up as I work my way through the answers to another question I just asked. My understanding is that plant photosynthesis looks something like this (though with lots more going on ...
0
votes
0answers
18 views

Why didn't animals evolve wheels for locomotion on land? [duplicate]

It seems that our technology heavily favors wheels for the locomotion of machines over land, but evolution came up with legs instead. The following assumptions might be wrong, I'm merely speculating, ...
2
votes
2answers
46 views

Protein Structure Parameters

I'm wondering about the minimal set of parameters necessary to define a protein's structure. My understanding is that the backbone geometry is defined by the phi and psi angles (torsion angles), and ...
2
votes
1answer
25 views

Could someone entirely absorb smells by smelling?

When smelling, your nose detects the smells by absorbing them. Does this mean that, if you were in an enclosed space, you could smell so much all the smell goes, and there is none of that molecule ...
2
votes
1answer
120 views

Proteins: Post translational modification

I am a physicist and trying to understand some protein chemistry for a small project. Basically, amino acids combine to form proteins and after forming the primary structure, some chemical ...
1
vote
0answers
24 views

Does Smartphone cause ear pain? [closed]

I used samsung galaxy y for last two years. I used to speak more than 3 hours per day in the phone. Now if i bring any smart phones near to my ear, i can't bear the pain. I have little cold and 4 ...
4
votes
1answer
41 views

How much of what we eat ends up in the toilet?

An awkward question. Bear with me... In terms of mass, what percentage of the food that we eat do we end up excreting? Of course, it depends on a whole host of factors so lets assume a healthy ...
4
votes
1answer
49 views

Redheads and pain receptors

I remember reading this in a biology textbook, and decided to do a little digging. Redheads have a lower sensitivity to some pain and a higher sensitivity to other compared to people of other colored ...
0
votes
0answers
5 views

In insects, does the Alanine repeat occur on the homeodomain sequence of the abdomen or does it occur on a different sequence?

By "Alanine repeat", I am referring to the suppression of the formation of extra insect legs due to Ubx gene suppression through Distal-less repression.
1
vote
2answers
47 views

How does it make thermodynamic sense for photosynthesizers to turn CO₂ into O₂?

My understanding is that animal metabolism consists of exothermic reactions like $$\ce{C6H12O6 + 6 O2 ->6 CO2 + 6 H2O + energy}$$ This makes thermodynamic sense to me. Animals need an exothermic ...
1
vote
2answers
23 views

Enzymatic error rate

I am aware that each enzyme generate a certain amount of misproducts. This is well documented, for example, for the DNA polymerase. I am interested in enzyme involved in biochemical processes, so for ...
2
votes
0answers
36 views

Why did the Brain develop in the front in most organisms?

I was wondering my most, well pretty much all organism with a brain have it right in front of their bodies or at the top.
2
votes
0answers
73 views

What's Incomplete atrioventricular heart block (AV)?

This is unclear for me and I can not understand differences between complete and incomplete atrioventricular heart block.also I want an electrocardiograph of incomplete atrioventricular heart block.
8
votes
2answers
105 views
+50

Why do we urinate more when we are nervous?

This question is a result of my personal experience... But I guess that is common for many of us. My school timing is 8:00 am to 1:30 pm (usually). During normal school days I typically urinate one ...
6
votes
1answer
48 views

Which will produce more oxygen? Less number of (larger) trees or more number of (smaller) plants?

In a given area A, we have two choices - (i) we can plant maximum number of trees (which are larger in size) possible in A, say m OR (ii) we can plant maximum number of plants (which are smaller in ...
0
votes
0answers
9 views

Stem cells and if they can correct a lack of apoptosis

If a cell ,call it C1 has no functioning apoptosis mechanism could a stem cell somehow be 'induced' to be like C1 , at least have the same genome as C1. Then use this stem cell 'duplicate' to ...
1
vote
0answers
27 views

Which method would more accurately help to identify the unknown concentration of a protein sample between the A280 and the Bradford methods?

I quantified my protein using the standard Bradford method and the A280 methods and obtained values that were far off from the theoretical value of the protein of interest, and therefore was wondering ...
2
votes
0answers
22 views

Time lapse between fresh blood's exposure to air and that same blood turning darker red-brown [closed]

Using the example of a smear of blood from a cut on the arm (as when a person attempts to wipe away the blood), does anyone have a general idea of how much time it takes for that smear of blood to ...
4
votes
1answer
35 views

How does aging affect fingerprint?

Do fingerprints change as we grow from child to adult? Most notably, what is the effect of the increase in surface area of palms and fingers on the finger print? Does the finger print simply increases ...
3
votes
0answers
193 views

Why are fingerprints different even in identical twins? [duplicate]

Why are fingerprints different from person to person? It can't be genetics. Even identical twins has different sets of fingerprints. What is the deciding factor that form and shape our fingerprints?
5
votes
1answer
117 views

Is brain transplantation possible?

Many organs can be transplanted nowadays, including the liver, lungs and kidneys. Can the brain be transplanted?
2
votes
1answer
23 views

Metabolism of different saccharides

Learning about carbohydrates, I wonder what the differences there are in terms of metabolism, and overall health between the different types of saccharides. In other words, does the body use ...
1
vote
2answers
50 views

Do variant callers miss rare variants in reference?

Generally variant calling programs (such as GATK-UnifiedGenotyper) look for differences between reference genome and submitted sequence. However, we all know that reference genome consist rare ...
1
vote
3answers
39 views

How do scientists decide which version of a polymorphism is the main one?

This in fact has bugged me for years, but now I finally remembered to ask. I suppose that if one variation is more frequent, it can be labeled as the default, but what about variations that are ...
0
votes
0answers
9 views

Peristaltic pumps in animal perfusion - how important are physiological flow parameters?

Animal perfusion is usually done according to this or very similar procedures. Though not explicitly detailed in this video, the perfusion fluid infused into the Aorta is usually driven via a ...
2
votes
0answers
25 views

Neural correlates of the function of the cardiovascular system?

Are there any known neural correlates of the function of the cardiovascular system? I'm looking for research results that use standard brain imaging techniques (e.g. electroencephalography, ...
3
votes
1answer
49 views

Maximum RPM in zero-g before losing consciousness, spinning head-over-heels

There are more than a few scenes in Gravity that I find dubious. Specifically the ones where people are revolving very quickly, either about their own center of gravity or at the end of a rather long ...
7
votes
1answer
51 views

How well does the radius of a tree correlate with its age?

I'm looking for a cheap non-invasive ways to approximate the age of a tree (a birch). Measuring the radius pops up in the mind as the first alternative. How would one do that? Measure at multiple ...
2
votes
0answers
23 views

What mechanism is responsible for germinating in the right direction (root towards gravity)? [duplicate]

Regardless of the initial seed orientation, the root always grows/sprouts/germinates "towards gravity" (see picture), sometimes curving around in sharp 180°. What is the mechanism responsible for ...

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