1
vote
2answers
186 views

Why can silicone reduce keloid?

I heard people use silicone sheet for reducing raised scars (i.e., keloids). I was wondering what is the rational behind it, and whether it actually works.
4
votes
1answer
328 views

Why do humans alone have the capability to have religious/spiritual experiences?

What is it in our brain that makes having such experiences possible? I assume other species don't have these. Sure there are instances in the natural world where you can see individuals of the species ...
2
votes
1answer
2k views

Why does yawning impair hearing?

When I yawn I can't hear anything happening around me. I also feel some kind of muscles inside my head contract and hear a faint hum, but it is not loud enough to explain not hearing other sounds. I ...
2
votes
4answers
896 views

Refutation of Darwin's Random Evolution Theory [closed]

I saw this refutation online of Darwin's Random Evolution Theory and cannot see any holes with the logic. Can anyone crack this simple refutation? Refutation of the Theory of Random Evolution ...
2
votes
1answer
167 views

Is this an Emperor Penguin or a King Penguin?

I have a book from Dorling Kindersley called Animal Encyclopedia (the German version that I have is called Das große Tierlexikon) with images from animals. One is titled Emperor Penguin ...
2
votes
1answer
3k views

Which blood vessel carries the most impure blood?

There is a question in my Biology textbook: "Which blood vessel in the human body carries most impure blood after few hours of meal." The answer is given as Renal artery. But I think the ...
7
votes
1answer
329 views

Has any large-scale origin-of-life simulation/experiment been done?

I have been thinking a little about the origins of life, and was further inspired by this question: How did the first self replicating organism come into existence? I can accept that we don't quite ...
2
votes
1answer
476 views

What is the surface area of the human heart?

I heard that the human heart had a surface area of 1000 square feet, and I thought that that cannot be true. So what is the surface area of the human heart and what are the different ways it can be ...
7
votes
3answers
5k views

Why does having cold hands hurt?

(1). Why does having cold hands create a painful sensation? Is it a physical effect, maybe a protection mechanism from evolution? (2). Why, if one's hands are cold, does it feel as if they are more ...
3
votes
0answers
94 views

What are the physiological effects of wine?

I have read that alcohol in general and wine in particular can have advantageous as well as detrimental effects on human health. Is this true? What are the physiological effects of consuming wine in ...
0
votes
2answers
108 views

How might one determine if bacteria are nitrogen fixing or not?

If you had an isolate bacteria sample how would you determine if they were nitrogen fixing?
3
votes
0answers
34 views

What Effect Does the Endocannabinoid System have on Monoaminergic Neurotransmission?

I know that Δ9-tetrahydrocannabinol and other cannabinoids increase dopaminergic neurotransmission in the nucleus accumbens and that this is what results in the euphoria experienced by cannabis users. ...
3
votes
2answers
108 views

Connect the inner and outer space of cell with a wire, will there be electricity?

There is a potential difference, but ions can not go through wires, right? Though there is a electric field, but there is no electron source, I am thinking the answer is no, or will there be some ...
1
vote
0answers
79 views

Are there any mammals in which polyspermy produces viable zygotes?

Are there any mammals in which polyspermy produces viable zygotes? In the wikipedia page it is mentioned that there is a delicate equilibrium between female defenses against many sperms, which ...
2
votes
1answer
48 views

What's the simplest set-up to demonstrate soiless plant growth to middle school students?

I'm looking for a simple, inexpensive way to demonstrate that soil is not needed for plant growth to middle school students. I plan to germinate bean seeds in cotton, but where do I take it from ...
4
votes
2answers
2k views

Do neurons secrete multiple neurotransmitters, or just one type?

I know that neurons communicate between each other by filling the junction between dendrites with neurotransmitters. What interests me is if a single neuron only works with one type of ...
3
votes
1answer
130 views

Where does all the food go?

Food goes in, excrements come out. This seems obvious. But it seems like the mass of the excrements is less than the one of the food. Most people I asked answered: "There's a difference because it's ...
2
votes
2answers
106 views

Are humans still competing in the same way now that the first life forms did?

I'm not sure if this is actually a philosophical question, but I was reading a timeline of life on earth and I came to this: 4500-3500 Ma The earliest life appears, possibly at Alkaline vents ...
3
votes
0answers
81 views

Papers linking telomeres and aging [closed]

I'm currently writing a piece of work about telomeres and aging, and wondered if you could share some good papers you've either read or know of.
12
votes
1answer
568 views

Why do we feel tired if we sleep excessively?

When we eat, finally we feel full. I know which mechanism causes the sensation of being full. But when we sleep excessively we often still want more sleep. Why does this happen? Is there a mechanism ...
0
votes
2answers
745 views

Why have humans evolved conciousness?

Why did humans/animals evolve to become self-aware of their own thoughts. That is, why don't humans act and compute like a machine, or walking zombie. In my mind, such creatures would still be as ...
5
votes
2answers
3k views

How does HCl does not burn our stomach?

How does the digestive acid (HCl) not burn the surrounding skin of our stomach? It digests majority of raw food we eat but how does it stays safe in our stomach? Also, how does the stomach retains the ...
2
votes
1answer
93 views

Is anaerobic activity during ketosis possible?

When a person's glucose and glycogen stores are depleted, which can occur due to fasting or due to a diet consisting largely of fat (like eskimo diets), the body produces its energy by breaking down ...
2
votes
0answers
37 views

Glutamine analysis

I use to run a method to analyse all the amino-acids in a food sample. For that I have to hydrololyse the sample and in the last stage of the method I read the amino acids with a ion exchange ...
3
votes
1answer
100 views

How to evaluate the efficacy of an antibody for fluorescence microscopy?

I'm trying to evaluate data taken from fluorescence microscopy with antibody staining, and am wondering whether there is any standard way to evaluate the specificity of the antibody for such ...
4
votes
2answers
169 views

Biological key file format

I am in the process of creating biological key software tool for use on android devices. I would like to know if there are any established file formats for storing biological key data. Thanks
2
votes
1answer
216 views

Is Webmedcentral a reputable scientific publisher?

I am a student, and I have written a paper (in drug discovery) which I want to publish. While searching for possible journals I came across Webmedcentral. Is Webmedcentral a reputable scientific ...
5
votes
2answers
91 views

What is the state of automated quantitative analysis?

Quantitative analysis of microscope images is essential for many types of studies, but the techniques used most often are very labor-intensive. I have been able to find some literature about using ...
3
votes
2answers
276 views

variation in antigen binding site of antibodies

Antibodies or immunoglobulins are proteins made ​​by the immune system in response to alien(!) molecules. Each antibody binds to its specific antigen. This great diversity and specificity is cause of ...
6
votes
1answer
129 views

Do adjacent axons in a nerve influence each other?

Suppose I have a nerve fiber consisting of several axons all running in parallel to each other. When an action potential is generated in a certain axon, this will alter the concentration of sodium ...
2
votes
1answer
120 views

ATP in Glycolysis Vs Gluconeogenesis

In glycolysis, the conversion of glucose to pyruvate results in a net gain of 2ATP molecules. In gluconeogenesis however, the conversion of pyruvate back to glucose requres 6ATP molecules. Why does ...
3
votes
2answers
103 views

How would ecology be affected if 100km² of an ocean surface was covered by a floating object?

Assume that we planted floating solar cells on the ocean surfaces. Assume a 100km² solar cell field in the middle of the Pacific Ocean. All of the sunlight will be blocked by them. How would that ...
4
votes
1answer
116 views

What kinds of arousal can a human brain experience?

I've been reading about the new phenomenon called "arousal addiction". The context in which this term is used is Internet, Porn and/or video game addiction(cummulatively Internet Addiction Disorder - ...
0
votes
0answers
52 views

Why aren't D-amino acids used in proteins? [duplicate]

Possible Duplicate: Why are amino acids in biology homochiral? Why are only L-amino acids used in protein construction, and not D-amino acids?
7
votes
2answers
10k views

At what age do babies begin to synthesize their own antibodies?

When babies are first born, they receive their antibodies from their mother (I assume because they do not yet have the capacity to synthesize their own). So my question is, at what age do babies ...
2
votes
1answer
127 views

Photosynthesis - Light Intensity

Say I was conducting an experiment for photosynthesis. If I moved light closer to the plant, what effect would this have on the process of photosynthesis?
6
votes
1answer
132 views

Cooking with sawdust

In a book about post-war Japan (Embracing Defeat, Dower) the author mentions a process for making sawdust at least partially edible, so it could be used in recipes in a 1:4 ratio with flour for ...
2
votes
1answer
115 views

What is the cannabinoid autoreceptor?

"Is there a cannabinoid autoreceptor? And if so what is the cannabinoid autoreceptor?" (i.e. is the cannabinoid autoreceptor CB1, CB2 or is it one of the G protein coupled receptors, GPR18, GPR55 or ...
4
votes
2answers
308 views

Effects of exercise on the brain

I am well aware of the phenomenon of neurogenesis induced by exercise, as well as the dopamine release that results from exercise. I am really interested in neuropsychology and the effects of exercise ...
-2
votes
2answers
476 views

Why human body cannot defend against HIV? [closed]

Some says that HIV destroy IRF3, and some says HIV overruns T-cells.
5
votes
3answers
309 views

What is the inbreeding coefficient for the female offspring of a sib-mating in a haplodiploid system?

The inbreeding coefficient of a sibling mating for a diploid organism is 0.25 (each allele has a 25% of being identical by descent in the offspring). In haplodiploid organisms, males result from ...
3
votes
3answers
11k views

What type of cell do you start with in Meiosis?

Okay, I was learning about mitosis and meiosis in school and had a question. I know in Mitosis you first start off with a Diploid (2N) cell and then end up with two ...
6
votes
4answers
131 views

Can a tumor produce something not currently found in our own bodies?

While speaking with my co-workers, the topic of tumors growing things came up. The examples were (and backed by images) of tumors growing a tooth, hair, and sometimes even more complex objects such ...
5
votes
1answer
135 views

What is the extent of the effect of Tris on E. coli?

I was a fool and dissolved my antibiotic (Kanamycin) into Tris Buffer rather than H₂O. The Kanamycin still seems to be active but a fellow labmate mentioned that Tris messes around with the membrane ...
2
votes
0answers
39 views

Endocannabinoid Transporters - which ones are Likely to Exist and what is the Evidence for their Respective Existence?

Endocananbinoid = Endogenous Cannabinoid or CB1 and CB2 ligands. I'm asking which endocannabinoid transporters exist and could the one answering show all the evidence for the existence of the ...
3
votes
4answers
963 views

What evolutionary reason is there for having the urinary duct and reproductive organs so close together?

As the old joke goes, "God must have been a civil engineer. Who else would put a waste facility straight through a recreational area?" But maybe it wasn't God. Is there any evolutionary reason (or ...
4
votes
1answer
210 views

How is respiration an unbalanced equation

The equation for respiration is C6H12O6+6O2→6CO2+6H2O+36ATP. The chemical formula for ATP is C10H16N5O13P3. How is this possible, since it violates the law of conservation of mass because it is ...
1
vote
1answer
51 views

Does difference in expected life duration between men and women have biological nature?

It is known that men in most countries live less than women. I wonder whether it is due to different life conditions or because male and female organisms differ? For example, I heard that ...
9
votes
2answers
707 views

Do hormone drugs affect whether a person feels sexual attraction to males or females?

I know that ingesting testosterone and other hormonal drugs may stimulate libido and increase sexual desire. But I wonder, if a man ingests female hormones such as estrogen, will he experience sexual ...
7
votes
3answers
469 views

How can you test what color different people perceive?

If I would show someone a yellow object and ask them, "is this object yellow?" That person would say "yes". But I could never know if my perception of the color yellow is the same as that other ...

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