7
votes
3answers
1k views

What is the science behind the inaccurate perception of colors?

If I go into a green room (all walls are semitransparent and green) and spend some time - around 10+ min - in there, when I come out all my eyes see is white as pink. I see no (or very few other) ...
11
votes
2answers
213 views

Is there any evolutionary advantage of selection of L-amino acid over D-amino acid?

After listening to a scientific talk, I had this question that why in the natural selection process, are the L-amino acids selected over the D- form. However, we still we produce D-amino acids; ...
3
votes
1answer
114 views

Specific location where nerves converge

I'm looking for the "earliest" specific site where the 3 following nerves' sensory signals "converge": Trigeminal nerve Median nerve Superficial peroneal nerve By "earliest", I really mean the ...
2
votes
0answers
60 views

Are the Chromosomes organized in any meaningful way? [closed]

So my major is in pharmacy but both my master and my (currently in progress) doctoral degree are both in theoretical chemistry. My thesis is about quantum chemistry and proteins, but it has a certain ...
4
votes
1answer
55 views

What is the biggest facultative anaerobic metazoan known to science?

Related: What's the biggest obligate anaerobic organism discovered till now? I had always assumed that the Riftia tube worms were obligately anaerobic since they lived next to anoxic volcanic ...
-3
votes
1answer
1k views

Are transgenders born physically different from others?

Are all children born with only either male or female body parts (other than exceptions), or is there actually a natural third gender with the physical characteristics of both genders, e.g. the child ...
3
votes
1answer
730 views

Names of nerves in hands, shins and face

I am looking for the names of the nerves in 3 specific locations of the human body: The nerve running along the "top" (opposite side of the palm) portion of the thumb, from knuckle to fingernail ...
0
votes
1answer
44 views

Spironolactone's role with adrenergic agents in heart failure?

I am studying the treatment plan of adrenergic agents for heart failure. Then, in the group discussion, spironolactone was included. But I cannot understand how it is relevant when considering ...
7
votes
2answers
207 views

What does pain look like in wave form?

I am interested in understanding what "pain" and "hot/cold" look like, as far as waves signatures (signal processing) go. My general understanding of how pain (nociceptive pathways) and hot/cold ...
4
votes
1answer
1k views

Why are irises unique?

I heard that irises are different and unique for every person. According this link, probability of two irises having identical pattern is 1 in 10 to the 78th power. That's how iris scanners identify ...
0
votes
2answers
142 views

Binding of Multivalent Antibody to mutiple epitopes?

A multivalent antibody molecule such as Immunoglobulin M Immunoglobulin A etc bind to more than one antigens or epitopes but I am confused about that wheather these multivalent antibodies bind to ...
3
votes
1answer
31 views

Regarding tumors and their developement

If certain cells or tissue in a specific part of the body are for some reason overworked; like the cases of severe acid reflux damaging the throat repeatedly and the cells in the throat having to do ...
2
votes
2answers
4k views

Can I drink warm/hot tap water? [closed]

I live in Canada and tap water is drinkable, as a matter of fact, the government puts a little bit of flouride in the tap water so it cleans your teeth. My wife and mom always tells me not to drink ...
8
votes
1answer
355 views

Single long axon vs serial neurons

Based on the comments in this post and also this chat. For discussions and speculations please comment in the chat. The basic question is what is the advantage of having a single long axon such as ...
2
votes
0answers
41 views

How do I get recombinant proteins into the nucleus of mammal cells?

I know that there are Nuclear Localisation Sequencenes (NLS). They can be taken from endogenous or viral proteins and fused to the N or C terminus of my recombinant protein. Which is the best one? ...
1
vote
0answers
47 views

How do PER/CRY complexes accumulate in the cytoplasm?

The Period/Cryptochrome (PER/CRY) complex is a heterodimer that transcriptionally regulates circadian rhythm. When it is phosphorylated, it is transported to the nucleus and it inhibits a ...
2
votes
1answer
2k views

Nerves, Neurons, Axons and Dendrites by Example

Here is a simple diagram of a neuron: A few (very closely related) questions: Where are receptors located (for pain, pressure, temperature, etc.): in the axon terminals or the dendrite tree? ...
3
votes
1answer
121 views

How can I purify RNA after gel electrophoresis to remove residual acrylamide?

I sometimes use denaturing gel electrophoresis on a preparative scale to purify RNA produced by in vitro transcription. The major issue with this is that the sample after extraction from the gel still ...
2
votes
0answers
1k views

Physiologically, how can stress/anxiety cause neuropathy?

According to the Mayo Clinic, stress/anxiety can cause "pins and needles" (neuropathy) sensations all over the body. But how can this be? My understanding of the sensory pathway is that sensory ...
4
votes
1answer
137 views

Is it possible to dock multiple ligands with the target?

Is it possible to dock multiple ligands with a target? If so, what is the suitable software used for? -- Is it possible to fix specific docking region for the target (or) automatic?
0
votes
1answer
59 views

Satisfication with irrelevant things [closed]

I am not sure if this question is better suited CogSci.SE so please tell me. My question is why are we satisfied when we get things that aren't useful in any important way? For example, relating to ...
1
vote
1answer
202 views

Can signals travel “backwards” in the sensory pathway?

My understanding of the "sensory pathway" is that its a linear, directional pipeline as follows: Nerves (fire various signals depending on the type of sensors they are) Fibers (transmit signals from ...
2
votes
1answer
101 views

Fab fragments of antibodies to fight viral infections

I was reading about Fab fragment and about using them to fight of viral infections. It seems that the Fab attaches to the viral receptors, which stops the viruses from attacking the cells. It seems ...
24
votes
3answers
2k views

Hot water and bacteria

I know that it is common to say, "use hot water when washing your hands" or when you've got a cut, "wash your hands with warm water," etc. I was wondering, why is this the case? Since bacteria grow in ...
1
vote
0answers
46 views

Persistency of botulinum toxin in environment

There is information about decontamination times here on pages 6 and 7. My specific question is how persistent botulinum toxin is in a natural environment, or alternatively, what is the half life of ...
0
votes
1answer
32 views

Cells scatter light in solution. Do they refract?

For part of an exam question, "why do cells grown in liquid cause turbidity?" I answered that cells refract light. The correct answer was that cells scatter light. Isn't the light scattering ...
3
votes
1answer
78 views

Why do some animals try to imitate other animals?

There is a tendency of some animals (including people!) to be "copy-cats" and try to imitate members of their own, and sometimes other, species. The most obvious example is a parrot copying human ...
-1
votes
1answer
80 views

What is the evolutionary purpose of white spots in nails and how can they be characterised due to Leukonychia? [closed]

Suppose you haven't hit your nails so the white spots are due to Leukonychia. Are the discoloration i.e. the white spots due to lower porosity (less minerals absorbing) or some other factor? I ...
5
votes
1answer
254 views

Western blotting with multiple antibodies

Normally I wash/detect with one primary/secondary-HRP antibody pair, strip, then wash/detect with the other primary/secondary-HRP pair which works well. However, I recently started working with a ...
2
votes
1answer
76 views

Anatomy of nervous system's sensory pathways

When I touch my hand on a hot stove, I feel pain. I'm interested in knowing all the main "endpoints" (components/parts of the body) that are involved in relaying this pain signal. As I understand it ...
1
vote
1answer
58 views

How and where do nerves share pathways to the brain?

I am interested in understanding how pain receptors send signals to the somatosensory cortex (the part of the brain that registers various nerve signals such as pain, presure, temperatures, etc). ...
1
vote
1answer
6k views

Why do the major and minor groove exist in DNA?

So I know that the major/minor groove arise from the offset pairing of the two strands in the helix. All my textbook tells me is that "pitch causes the off-set pairing of DNA and this gives rise to ...
0
votes
1answer
38 views

What does 'pedigree information' mean?

This paper uses Pied Flycatcher as a study species. For the population of Pied Flycatchers they studied, 'pedigree information' was available. What exactly does this 'pedigree information' mean?
10
votes
3answers
1k views

Do snakes get dizzy?

I've seen snakes get captured in sacks and I've wondered if the snake would get dizzy if the sack were twirled around. I have not done any tests (and don't plan to) because snakes scare me.
1
vote
0answers
30 views

Would blue light be effective to help average people when sunsets come much earlier in the day?

I know people with SAD (Seasonal Affective Disorder) benefit from blue light in the winter as night-time comes much earlier (in the UK, sunset is around 4pm in December, compared to 9pm in June). ...
2
votes
1answer
103 views

Do distinctions between dry, tickly and chesty coughs have any medical basis?

Background At least in Britain you normally come across distinct kinds of cough medicine "chesty", "dry" and "tickly". Questions Are "chesty", "dry" and "tickly" coughs always due to ...
0
votes
1answer
71 views

Would humans eventually evolve to fight off fatal diseases if we didn't treat/vaccinate for them? [duplicate]

I am definitely pro vaccination, and the question is a bit morbid because people would die, but assuming that we didn't treat or vaccinate people for fatal diseases such as Ebola or the black death, ...
1
vote
1answer
109 views

What specific sensory nerves act as receptors for “pins and needles” (neuropathy)?

According to this excellent answer, the difference between "pain" and "pins and needles" (neuropathy) is that different receptors (sensory nerves) trigger in reaction to different stimuli. Different ...
0
votes
1answer
52 views

STRING ID - allelic differences and splice variants

STRING has protein (amino acid sequences) mapped to a single gene ID. I have these doubts with respect to STRING ID. I find that 1.All alleles of a single gene share the same STRING ID and ...
5
votes
2answers
127 views

Balanced vs Maximized Codon Optimization

I have worked with the optimization of several viral proteins, from different viruses/families, with different results. When Menzella, 2011 was published I tried that method. I found quite the ...
6
votes
0answers
78 views

Statistical method for characterizing the relationship between body mass and metabolic rate

There is a dataset that contains body mass ($x$) and metabolic rate ($y$) from many different organisms. It is common to fit the data to the model of the form $y=ax^b$ and estimate the parameters $a$ ...
4
votes
1answer
174 views

How could be the “Eurasian magpie” bird won the “Mirror Test” where Gorillas failed

EURASIAN MAGPIE VS GORILLA VS How could be the "Eurasian magpie" bird won the "Mirror Test" where Gorillas failed ? In 1982, mirror tests on two, zoo-reared gorillas failed to demonstrate ...
7
votes
2answers
200 views

Use cases of RNA secondary structure prediction

I'm an undergraduate currently writing a thesis on RNA secondary structure prediction, specifically building upon analysis done by the RNAStructure and Unafold software packages by modifying certain ...
1
vote
2answers
54 views

Why not use non-visual self-recognition to test for consciousness in an organism?

Background A well-known test for consciousness in an organism is to observe its ability to recognise itself in a mirror (see wikipedia article: "Mirror test"). Question Why haven't I come across a ...
5
votes
2answers
159 views

What is Environmental Robustness? Is it different from plasticity?

Hansen (2006) in his review uses the concept of environmental robustness independently of the other concepts of robustness (at pages 139 and 140) without defining ...
2
votes
0answers
41 views

Native vs Immigrant plants [closed]

Is this statement applicable to any known plant/region combinations? Plant species X, Y, and Z are truly indigenous to region R. Other "immigrant" species can be destroyed by drought or harsh ...
6
votes
2answers
2k views

Why does anxiety cause diarrhea or constipation?

Anxiety sometimes cause diarrhea, sometimes constipation, and sometimes both. It's interesting because it seems their underlying neurophysiology is somehow different. What are underlying physiological ...
4
votes
1answer
149 views

Circulating factors affecting human health/longevity

Circulating factors present in young mice have been shown to promote rejuvenation of aged mice, suggesting that tissues have inherent capabilities to regenerate, and circulating factors may be ...
2
votes
1answer
264 views

Speciation of humans? [duplicate]

Since we homo sapiens (and all other species) are continuously evolving, are humans undergoing speciation based on our environment? OR has there been any difference across people that could say ...
35
votes
2answers
2k views

Can brain cells move?

I was discussing this with my brother. I'm pretty sure I read somewhere that they can move. Thanks EDIT: By movement I mean long distance migration (preferably within the brain only).

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