9
votes
1answer
345 views

Is it possible to lose synapses over time?

I mean, what if a person is for a long time submitted to conditions in which his mental capacities are not explored, are the synapses undone? I've heard that drugs may cause such an effect, but what ...
4
votes
1answer
83 views

How would one describe the R-factor in crystallography?

Yes, there is the wikipedia definition, but how would one explain this concept to a non structural biologist?
1
vote
0answers
37 views

Where can I find approximate rates of sequestration of CO2 for different species of algae?

For a study, I want to compare the rates of CO2 sequestration and fixation of a few different species of algae. I could not find any data on the sequestration rates. Any pointers to where I can find ...
1
vote
0answers
25 views

Photosynthesis/Plants Question [duplicate]

Possible Duplicate: How long will a vegetable live for after being harvested? Exactly when do plants "die," as in stop functioning to live? If, for example, you pick a plant and start to ...
4
votes
0answers
49 views

Is it possible to repopulate lactase in the stomach? [duplicate]

Possible Duplicate: Can an adult without genetic lactase persistence still develop a tolerance for dairy foods? In my younger years, I don't seem to have a problem drinking milk. Nowadays, ...
3
votes
1answer
56 views

What are treatable foetal conditions during pregnancy?

What are different foetal conditions during pregnancy that could be treated with appropriate prenatal genetic testing? I only know that pregnant women are encouraged to take certain supplements to ...
3
votes
1answer
440 views

Is collagen supplementation useless?

When collagen is digested is it broken up into usable components that the body can use to produce its own collagen? What evidence is there that supplementing with collagen type I & II etc.. can ...
0
votes
1answer
100 views

What impacts on metabolism are likely from the 6x increase in water consumption by Americans at restaurants since the 1950s?

CDC data show that American water consumption in restaurant meals is 600% of what it was in the 1950s while meal calorie density has decreased (kcal/oz). What impacts is this likely to have on the ...
4
votes
1answer
87 views

Online toolkit that provides functional similarity scores (in the form of a matrix) between two functional gene sets in the context of gene ontology

Where can I find an online toolkit that provides functional similarity scores (in the form of a matrix) between two functional gene sets in the context of gene ontology? I have tried the following: ...
11
votes
2answers
1k views

Why do only only two sexes exist for animals?

Why, from the natural selection point of view, do only two sexes exist for animals?
1
vote
0answers
93 views

Properties and life cycle of chondrocytes and tenocytes

Questions regarding chondrocytes and tenocytes: Do these cells replicate, or are they regenerated from mature stem cells? How often are these cells regenerated? How long do they live? Do they ...
9
votes
3answers
1k views

Why does the butterfly have a cocoon stage in its life cycle?

Why does the butterfly have a cocoon stage in its life cycle? It could have simply grown up within the egg/cocoon, and emerged as a butterfly. Instead it is first an egg, then a worm, then a ...
1
vote
0answers
153 views

Extreme examples of protein translation/use coupling/decoupling?

What are known extreme examples of protein translation/effect coupling/decoupling? For example, examples of proteins that are immediately used at the time the have been translated and vice versa, ...
5
votes
2answers
2k views

What is the appropriate method to send a strain?

We are planning to send an ecoli strain to another lab. What is the appropriate way to do so. No MTA is required but the options seem to be using filter paper or sending a glycerol stock on dry ice.
5
votes
1answer
324 views

Do all plants photosynthesize with equal efficiency?

Just what the title states. Given identical, necessary and favourable conditions (Probably nutrients, humidity, and light but what I mean is all necessary requirements are fulfilled) - Is ...
5
votes
1answer
116 views

Is there any reason the common housefly continues to return to an area?

This might come off as a really silly question. But I'm wondering (especially in the case of food) if there is any reason a fly would continue to try and sit on top of a piece of food even after ...
7
votes
1answer
1k views

Why is the Kakapo more attracted to humans than its own kind?

The Kakapo can be seen in this video by BBC. It is said that the species is strongly sexually attracted to humans. Why could this be the case?
2
votes
0answers
229 views

Turn off multithreading in pymol [closed]

By default, pymol seems to grab the number of cores on the system for rendering. How can I force it to only use one core? Motivation: I have a large collection ...
6
votes
2answers
807 views

Density of neurons/cells in the mouse brain

Could someone point out some relevant papers or resources (an online DB maybe?) describing the density of neurons (or, more in general, of cells) in different areas of the mouse brain?
4
votes
1answer
315 views

T7 promoter leakiness

Can a gene be expressed under the T7 promoter in an E. coli strain (e.g. DH5 alpha), which does not have the T7 polymerase gene encoded in its genome? In other words, is T7 promoter leaky? To be ...
25
votes
3answers
387 views

Is telomere length a reliable measure of health/lifespan?

Several companies are commercializing tests for telomere length such as this one here. I understand the basic mechanism for why telomeres shorten during DNA replication, but how good is the evidence ...
9
votes
3answers
196 views

Does current evidence support the use of resveratrol as an anti-ageing drug?

A while back there was a lot of noise about resveratrol, a naturally occurring phenol which was touted as a potential anti-aging drug due to its role in regulating the SIRT 1 gene. A number of studies ...
7
votes
3answers
118 views

Free Radicals for aging

From my understanding free radicals play a slight role in ageing. In what ways are they so damaging, and can a restricted diet reduce production of free radicals?
2
votes
1answer
430 views

Why does ampicillin in solution turn yellow?

I have a universal tube with 10 mg mL-1 ampicillin. When I got it, it was supposed to be sterile. It was opened for approximately 20 minutes for an experiment and has since been standing around sealed ...
5
votes
1answer
548 views

Is there a relationship between efficiency of cellular metabolism and warm-blooded-ness?

My BIO 101 book states that when human cells convert glucose to ATP, the process is only approx 35% efficient, and much of the potential energy is lost as heat. However, that heat is useful to us in ...
3
votes
1answer
403 views

Could inhibition of progerin formation slow the rate at which a body ages?

According to wikipedia, progerin is activated in senescent cells. The protein itself is known to be the cause of a rare affliction 'progeria' - a disease marked by accelerated aging of the body. This ...
1
vote
0answers
308 views

Appropriate methods for triteration?

What is the appropriate method to pipetting up and down mammalians cells to sufficiently break up clumps. This should also keep in mind the issues from Pipetting damage on cells. Visually one can see ...
4
votes
1answer
126 views

Epilepsy explained by computational neuroscience

A few years ago, on my maths masters, I did a module in theoretical neuroscience. I was shown that the mathematical framework the course developed for neurons, with a small adjustment in the ...
6
votes
2answers
1k views

What happens to snakes that swallow rodents as a whole?

As we all know, a few species of snakes swallow rodents as a whole. My question is what happens to the teeth and bones of these animals? Won't they cut into the flesh of the snake and hurt it? Are the ...
-4
votes
1answer
283 views

Why hasn't mother nature made us aware of our lizard brain? [closed]

In many personal improvement books I've read, people make a distinction between 2 parts of our brain: the logical brain, dealing with logic, judgement, thinking; what makes Humans different than ...
1
vote
2answers
403 views

Shouldn't evolution have taken care of baldness already?

It is my understanding that the hair on the head is there to protect us from sunburn. I've never seen a bald animal, so isn't evolution in charge of addressing these type of things? How is it that ...
6
votes
1answer
208 views

What's the state of the art in designing and creating your own life forms?

What's the state of the art for solving the following problem. You imagine a set of features that you want a life-form to have. Just to take an arbitrary example, say you want your life-form to have ...
7
votes
1answer
139 views

Is the function of adjacent genes correlated?

Do genes that occupy a similar locus on the genome have correlated function, specifically in human beings? It is my understanding that adjacent genes are inherited together, and so location plays a ...
1
vote
0answers
32 views

Can progerin formation be triggered explicitly?

Corollary to my question - Could inhibition of progerin formation slow the rate at which a body ages? Is it possible to activate/trigger progerin formation explicitly? Say, by some hormonal/chemical ...
6
votes
1answer
169 views

What's a good reference for choosing histological staining chemicals?

It's often difficult to find the appropriate or best stain to use when I want to examine a new type of tissue. I think that's partly because many histological techniques were developed a long time ...
1
vote
0answers
61 views

Is pure (100% H20, (near to no) solutes) water toxic to living organisms? [duplicate]

Possible Duplicate: Death because of distilled water consumption I know about the effects and myths about drinking distilled and/or deionized water. I'm not asking about such substances. I ...
8
votes
2answers
459 views

Is it possible to live without health problems sleeping one day and not the other?

Basically, I want to know if it would be humanely possible to sleep one day, skip the next, sleep, skip, sleep, skip, etc, with a 8 hour sleep time. If you need any extra information, let me know.
5
votes
2answers
159 views

How high is the energy yield of photovoltaics compared to photosynthesis?

I'm not an expert in plant physiology. I was wondering if, per square centimeter, leaves are converting more or less energy than photovoltaic systems. Can this be estimated? How?
0
votes
1answer
428 views

Are there examples of the green beard effect in humans?

Green-beard effects are genes that: Produce an effect that can be detected Produce preference to others with the same effect Are there any examples of this in humans?
5
votes
1answer
1k views

Do hot drinks cool you down?

It is quite the old wives tale that drinking a hot drink cools you down. If you don't really think about it it does seem somewhat logical: increasing temperature will cause your body to try and cool ...
3
votes
1answer
510 views

Open protocol for Ligase Independent Cloning

Ligase Independent Cloning is a protocol that allow an insert to be integrated into a vector without ligation. It uses T4 DNA polymerase with only ATP to first chew back from blunt ends to create ...
7
votes
2answers
127 views

Genetic Models for Natural Selection?

My question is simple: Given that evolution is described by random genetic mutations allowing certain members of a species to gain a reproductive advantage over others that coexist in the particular ...
2
votes
1answer
51 views

What is an efficient way to spike 10-50 cells to a culture

I'm trying to add on the order of 10-50 mammalian cells to a mixture of other cells (order of 1e6 cells). What is the best way to do this? (edit) I guess this wasn't clear. I would really like to ...
6
votes
2answers
7k views

How do archaea relate to eukaryotes and bacteria?

I've read that they all share some genes, internal structure, and behaviour with each other, but with different degrees of overlap depending of what the function is. E.g., archaea have some eukaryotic ...
3
votes
1answer
3k views

Why is beta-mercaptoethanol often added to cell culture media

Many protocols suggest that beta-mercaptoethanol is necessary for growing cells. It is a reducing agent but what does it mechanistically do for your cells. When would one not add it.
4
votes
1answer
65 views

Features in individuals causing high population variation

As I understand it, a population with high variation is something sought after, since it makes the population better equipped to face a dynamic environment. Then, I guess features in an individual ...
23
votes
4answers
1k views

Why do men have nipples?

I'd be tempted to call nipples in men vestigial, but that suggests they have no modern function. They do have a function, of course, but only in women. So why do men (and all male mammals) have them? ...
10
votes
3answers
555 views

What is the most heat-tolerant organism?

What is the most heat-tolerant (or heat loving - hyperthermophile) organism so far identified? What adaptations does this organism have in order to endure such high temperatures?
4
votes
1answer
131 views

Regarding TIMP and MMP enzymes

Are there substances that can promote TIMP enzyme production, or MMP enzyme production or supression in tendons? Are there medical tests that measure quantities of MMP and TIMP enzymes in tendons?
5
votes
1answer
2k views

What are tendons made of specifically

From what I read on wikipedia they are made of collagen. Collagen is just a protein. Right? How is this collagen structured (I imagine like fibers). Aren't there cells in this fibers as well? From ...

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