0
votes
0answers
22 views

Prenatal hyperkinetic dysfunction and its effect on endurace

Do people with an hyperkinetic dysfuntion have a better endurance? Are they fitter in cause of their Dopamine-overdose or any other reason? I have a case, where someone does not do any sports, but ...
0
votes
2answers
137 views

What makes us all different and similar to some extent? [closed]

It is said that genes define how we look physically and psychologically; so for example if a male human sperm carries a certain number of genes, say x, and a female carries y, then mathematically ...
3
votes
1answer
118 views

Do macrophages engulf mtDNA?

Let us assume that in a human body, a mitochondrial DNA is released to extracellular environment. We know that mtDNA inheritance is solely matrilineal. So the question is, If your mitochondrial DNA ...
0
votes
0answers
11 views

Where is cartilage in the developing eye in embryo?

I am not completely sure where there are cartilage in the eye. I think the developing vitreous body (very light coloured) does not have cartilage. You can assume the eye is during the weeks 11-13 of ...
2
votes
0answers
43 views

How well does the event-driven DVS sensor approximate the rods of the retina?

There is a neuromorphic vision sensor that is generating some interesting research these days that is called the Dynamic Vision Sensor. One of the claims of this sensor is good approximation of the ...
1
vote
1answer
27 views

Detecting Calcified stones and cracks in tooth

I had a dental problem when my first molar broke some months ago and after some decay and pain I am undergoing a dental treatment. The doctor was performing a root canal and kept on talking about ...
2
votes
1answer
33 views

What are the criteria for determining the origin and end of muscle anatomically?

For example the pectoralis muscle starts from sternum region and ends on the acromion or coracoid process. Why you can't say that it starts acromion process and ends on the sternum?
1
vote
3answers
110 views

Could a sperm be altered to contain a female's genetics?

while discussing with a friend a while back on the likelihood a Funtari (a woman with both fully developed and functioning sets of genitalia) existing in real life we got into a discussion of weather ...
1
vote
1answer
47 views

What is the close and related genome used for in Gene models?

all I am a little bit confused about using the related genome or reference genome. When we have a reference genome, we can do alignment. Also we can do the assembly. Can you give some more reason ...
1
vote
0answers
195 views

In-Ear headphones increasing nasal breathing resistance

I figure this is a rather strange question, however, I noticed this quite some time ago and wanted to make sure that this is in fact a permanent condition before posting. The situation is as follows: ...
2
votes
1answer
36 views

Drosophila grey / yellow

I am studying biology by myself via distance-learning. I have been trying to solve the following problem for a while now and hoped you could help me. As this is "homework" I would appreciate hints ...
1
vote
0answers
137 views

What's the difference between Ki and IC50?

I have just read this post at researchgate: http://www.researchgate.net/post/How_to_calculate_experimental_binding_free_energy_from_the_IC50_value I would not be very sure about what the difference ...
0
votes
1answer
93 views

Color van der waals bonds in swiss PdbViewer

I'm trying to color certain amino acid's van der waals bonds as in the following picture: can anybody please describe the steps to accomplish that?
1
vote
3answers
367 views

Why do our eyes close when we sleep?

Why do our eyes close when we sleep? Is it to relax our eye muscles? How can it be explained from an evolutionary point of view?
1
vote
2answers
90 views

Gene perturbation, what is it used for, explain to computer scientists? [closed]

I am trying to build a gene regulation network, and I need some basic knowledge of it. So, in gene research, we perturb genes. Such as knock down them? Can people tell 2 or 3 experiment methods to ...
2
votes
1answer
32 views

The use of proteins in memory creation

I have very limited knowledge of how the human memory works as I think, at this time, most people do. However, I have been reading and some articles which say, and I quote the article just linked ...
1
vote
1answer
124 views

Transverse diffusion of lipids in red blood cells

The membrane of a human erythrocyte has polarity: Phosphatidylethanolamine and phosphatidylserine are predominantly on the inner side. Phosphatidylcholine and sphingomyelin are predominantly on the ...
3
votes
1answer
1k views

What is a suicide plasmid?

What is a suicide plasmid? Example: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2737453/ mentions a "suicide vector". See also ...
5
votes
1answer
79 views

Base Substitution Probabilities Derivation

In Felsenstein's 1981 Paper Evolutionary Trees from DNA Sequences: A Maximum Likelihood Approach, he describes (in equations (6) and (7)) a derivation of the equation of the probability of a ...
0
votes
0answers
31 views

How can cerebral vasoconstriction lead to decreased O₂ supply?

I am thinking the mechanism from hyperventilation into brain damage: hyperventilation [CO₂] decreases in plasma cerebral vasoconstriction which then decreases the oxygen supply i.e. [O₂] in the ...
4
votes
1answer
5k views

Can dish soap really be used to kill ticks and fleas?

An answer at Pets suggested using dawn dish soap to kill fleas. I did a little looking around, and found several references supporting the idea. Most of what I found was in 'selfhelp' and 'save a ...
3
votes
1answer
57 views

Is there a hormone combination that makes humans grumpy?

Imagine a typical situation that is likely to give rise to a bad temper within an individual: a person is awoken very early in the morning by a sound of a lawn being mowed next door. Unlike expected ...
0
votes
0answers
50 views

What is the current scientific position on the issue of human race? [duplicate]

Race is perhaps one of the most controversial and sensitive issues in anthropology, biology, and other related fields. As a non-scientist, I've used google to probe the disparity between the positions ...
2
votes
1answer
18 views

Question regarding 2 constructs of tobacco plant

Six independent transformation experiments of tobacco leaf explants were carried out using two different constructs - (1) construct I containing only a Hygromycin-resistance gene $(HYG^R)$ as a ...
4
votes
3answers
100 views

Membrane potential after exposure to glutamate

Neurons were kept in a physiological solution. During the resting phase, the membrane potential in the axoplasm of neurons was negative compared to the extracellular space and a potential ...
0
votes
1answer
36 views

What information do microarray image convey?

OK I have read that a cell generates 4 kinds of digital (to be precise discrete) data namely DNA, RNA, Protein (sequences that can be encoded as string sequences of nucleotides/ amino acids) and micro ...
5
votes
1answer
60 views

Can an insect poison itself with food?

Is it possible that an insect poisons itself while eating "wrong" plants/fruits/... and have symptoms like pain (may hard to measure or detect) or orientation disorder? Background: I observed a ...
1
vote
1answer
21 views

How does one verbally convey the equation used to describe the Förster distance of a donor and acceptor molecule? [closed]

I need to be able to verbally describe the following equation completely during a presentation in grammatically correct English (I'm not a native English speaker so this is a bit of a problem for me): ...
1
vote
1answer
28 views

To diagnose osteomyelitis of vertebral column in chronic kidney failure

Assume you suspect amyloidosis because of the history of the patient: problem with vertebral column and "purulent" (serous, fibrous, or hemorrhagic) inflammation when patient very young. Now, the ...
2
votes
1answer
57 views

Comparing Shine Dalgarno scores, creating a distribution

I am in the process of creating a poster for the phage that I recently annotated. The phage is an A4 and the portion of the poster I am working on is analyzing the data that we have collected. I have ...
5
votes
1answer
66 views

How does a Na+/H+ antiporter drive osmosis in this “osmotic motor”?

This recent paper in Cell describes a cancer cell using osmotic pressure to move in confined spaces. The cell preferentially inserts Na+/H+ antiporters in the leading membrane. I want someone to ...
6
votes
4answers
81 views

Exocytosis of mast cell secretory granules

I've been doing a bit of reading about mast cell degranulation and have become thoroughly lost while trying to understand how the secretory granules are actually secreted. I understand that there are ...
3
votes
1answer
64 views

Elevated position effect on recovery times from upper respiratory infections at rest?

In nursing school, they advice for people with upper respiratory infections to be in a slightly elevated position at the head region when sleeping. My intuition of the reason is that the lymphatic ...
2
votes
2answers
58 views

In genome research, what is the problem in Mapping that may be caused by reads being too short?

In the following scenario: You were given short sequence reads of plant RNA obtained from a next-generation sequencing machine (fragments of 20–30 nucleotides in length). You attempt to map them back ...
2
votes
1answer
98 views

Advantages of bisexual reproduction over asexual one toward species promotion? [duplicate]

Are there any advantages of bisexual reproduction over asexual one towards species conservation and promotion? Do animals that have two or more sexes have more chances to reproduce? Does anybody had a ...
0
votes
0answers
9 views

How is the nasal secretion system of local immunity coupled with lymphatic circulation?

I started a thread about Nasal chronic Inflammation after influenza virus here. However, I do not understand enough well the structure of the nose to answer the questions there. I know that the lysed ...
2
votes
1answer
594 views

Why does hemoglobin's affinity for oxygen increase if an organism lives at a higher elevation where oxygen is lower?

Wouldn't its affinity for oxygen decrease because the acidity of the body would increase with the lack of oxygen? The textbook said otherwise though and I don't understand.
0
votes
0answers
25 views

Chemical events of fertilization

During the acrosome reaction, the activation enzyme present in the sperm dissolves the corona radiata and zona pellucida enabling the sperm to reach the plasma membrane of the egg. Also calcium and ...
3
votes
1answer
80 views

Getting xyz co-ordinates from a .map file (CCP4 format) in VMD

I have a .map file which contains x-ray crystallography data of a bacteriophage. The format of the file is CCP4. I can open the file using VMD. However, I am unable to get the xyz co-ordinates. It ...
3
votes
1answer
59 views

In the endomembrane system, after a protein leaves the rough ER, where does it go?

It can either go to the smooth ER then to the Golgi or it can go directly to the Golgi, right? Also, the smooth ER gets all of its material to synthesize things from the rough ER, right? Sorry, I ...
4
votes
2answers
93 views

Do miRNA and antisense RNA do essentially the same thing?

Don't they both just disrupt RNA so it can't make a protein? If so, then what is the difference between the 2?
2
votes
3answers
211 views

Does any animal species have two sexes and more genders?

Does it exist any animal species that have two sexes and a kind of different internal diversification in two genders or more? I mean no something like different-task-based diversity but something ...
1
vote
0answers
44 views

Infering the statistical tests performed in a paper [closed]

I am in great need of help in order to infer the statistical hypothesis tests performed in this paper (Xanthelasmata, arcus corneae, and ischaemic vascular disease and death in general population: ...
1
vote
0answers
56 views

Nasal Chronic Inflammation after influenza virus

I am studying the nasal secrotory system of the nose (lymphatic system not relevant; serum) after infection of influenza A virus when there is a big red edema at the back of the nose. I found no ...
5
votes
1answer
136 views

Why is there no cure for Dandruff?

It looks like a simple problem, affecting almost half of the population at the post-pubertal age and of any gender and ethnicity [wikipedia]. What is so complex about finding a cure? Also, if you know ...
1
vote
1answer
31 views

To determine no beating cardiomyocytes from ECG or video recording

I am trying to find data and some method by which I can see and say that there are some cardiomyocytes not working. I have reviewed many arrythmia data where I think I can see much cardiomyocetes ...
1
vote
1answer
37 views

Fastest and slowest action potential

When our instructor asked us about the speed of action potentials in cells, I told him that action potentials and two-wheelers travels at similar speeds. He thought that this is an 'interesting' way ...
4
votes
1answer
116 views

Why is the mosquito a definitive host in malaria?

I thought that the definition of a definitive host was that the parasite had to sexually reproduce in that particular host. I've been told that mosquitoes are the definitive host for the plasmodium ...
1
vote
0answers
26 views

Series of exercices on population structure (population genetics)

I am seeking for a series of exercices (with solutions if possible) concerning population structure. I am particularly interested in exercices that involve indices such as $F_{ST}$, $F_{IT}$, ...
2
votes
1answer
25 views

Is a double-yolk egg capable of producing two viable chicks?

As per title: If fertilized, is a double-yolk egg capable of producing two viable chicks (that could survive to adulthood)? Have there been any reported cases of such (presumably) fraternal twins?

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