2
votes
2answers
34 views

Diffusion coefficient of cells in blood?

What's the diffusion coefficient of white cells in blood? Is it well defined, or are cells too large and few as to be treated as particles in this context? P.S. I have tried to look this up, but what ...
10
votes
1answer
129 views

Unilateral damage to vagus nerve

Context: The vagus nerves supply the neck viscera, heart, lungs and gastrointestinal tract. They join around the oesophagus to form the oesophageal plexus. Question: Would damage to one vagus nerve ...
0
votes
0answers
4 views

Larvae Identification

Can you help identify this worm? It was found in a cup of water at a restaurant (unpleasant, yes), likely came through the water system. (Location: Texas) Found these images of it online (in which ...
-1
votes
1answer
56 views

Is evolution a predictive theory?

My feeling is that almost any observation can be explained by current evolutionary theories. Is there any example of someone developing a rigorous framework or model of how evolution works?
0
votes
1answer
37 views

Current state of Gene Therapy

I am interested in learning about attempts to treat adult individuals suffering from a genetic disease in which the underlying changes in the DNA of the gene are understood. (i) Are there approaches ...
1
vote
1answer
6 views

If crocodiles are k-selected, why do they supposedly “not age,” as in avoid senescence?

I recently saw a few sources stating that Crocodiles do not biologically age, implying negligible senescence. Basically, a 70 year old crocodile is in the same physical/health condition as a 7 year ...
0
votes
1answer
6 views

Mesoderm vs Mesenchyme- what's the difference?

My embryology textbook states that mesoderm can exist as Mesenchyme or Epithelium. I'm not sure what 'epithelium' means. Here is a quote for context: Somatic, splanchnic, and somite mesoderm can ...
-3
votes
0answers
38 views

ants and their super powers [on hold]

I've noticed lots of ants being inside a package with sugar confectionery decorations. How did they get into a completely healthy package ? (P.M they ate its colors, what is left is some boring ...
2
votes
0answers
15 views

The Perplexing Trilobite: What is the Evidence Supporting The Hypothesis That They are Not Crustaceans?

In the field of paleontology, one question that's really bugged me (er, no pun intended) of late is why the subphylum/class Trilobitomorpha/Trilobita is off on its own branch of the Arthropoda phylum, ...
2
votes
2answers
69 views

How much genomic variation one usually find within a given bacterial species?

If I find the exact starting position (say 1152471) of the coding sequence of a given gene in the genome of a bacterium, is the genome of the bacterium in general stable enough so that I can expect to ...
4
votes
2answers
7k views

Why can't ciliary muscles in the human eye relax like other muscles?

I had laser eye surgery a decade ago, but in recent years my eyesight has become significantly myopic. I consulted an ophthalmologist to see if this was eye strain because I work at computers a lot, ...
0
votes
1answer
60 views

Interpretation of faint band for Linear Array HPV Genotyping Test

After having used the test for research it would appear as if it is very specific. What is one to make of bands that are there but faint? Or what if there are two bands and one is big and bold and the ...
0
votes
0answers
8 views

Fine permanent fluorescent marker for blue light

I am looking for a fine- (or small-)tipped permanent marker to write on Petri dishes that is visible under a blue light or a transilluminator. It would seem obvious, but it is a nuisance. The ...
3
votes
1answer
34 views

How do we find antibiotics?

So the last class of antibiotics were made in 1984 (I think), which makes it appear as though they are hard to find(/design maybe). How is it then they were discovered? Was it by chance? I know some ...
1
vote
0answers
19 views

Can we modify plasmids to eliminate antibiotic resistance?

This is a very general question regarding the potential use of artificially modified plasmids to block or modify bacterial evolution in order to prevent development of anti-biotic resistance. For ...
2
votes
1answer
17 views

What are tail currents?

This is a voltage clamp on an ion channel. When the voltage is stopped there is a still a current at the end (the tail current). I understand that the gates aren't completely closed because of which ...
-2
votes
2answers
46 views

What are sex linked traits?

Which of the two definitions of sex-linked trait is correct? Traits controlled by genes present on the non-homologous region of sex chromosomes are called ...
7
votes
3answers
101 views

Following DNA replication during S-phase of the cell-cycle, are all genomic regions subjected to the same stringent level of DNA-Repair?

To my (limited) understanding, there are 2 main ways that mutations can occur in DNA: Environmental (UV, etc) and mistakes during cell division. I was wondering if there is a mechanism that can give ...
17
votes
1answer
763 views

Additive genetic variance components from LMER in R

I've set up some dummy data in R which makes 40 genetically related lines, they are all siblings within a line so are genetically related by a factor of ½ thus additive genetic variance should be ...
1
vote
1answer
78 views

What does NaOH do for the plating of Bacillus subtilis?

A book called Molecular Biological Methods for Bacillus called for plating Bacillus subtilis cells on LB-agar plates with the following components: A general-purpose medium containing per litre: ...
5
votes
2answers
60 views

How does the brain know what to remember and what not?

People remember some information for example when learning for an exam, or remember to go to a shop after work etc., but we don't remember usually much other stuff like people passing us, what was the ...
16
votes
4answers
2k views

Book recommendation on population/evolutionary genetics?

I have recently been involved in collaborations that require me to model the population genetics of eukaryotic populations. I fear I may either be "re-inventing the wheel" or making conceptual ...
0
votes
0answers
7 views

Methods for detecting local adaptation in absence of genetic data

Background Local Adaptation is a famous subject of interest in ecology and evolution. Among ecologists, it is not rare to try to find evidence of local adaptation in absence of genetic data. As a ...
0
votes
0answers
13 views

What happens when mammalian ovum fails to get fertilized? [on hold]

If mammalian ovum fails to get fertilized , which of the following is unlikely ? a) corpus leuteum will disintegrate b) estrogen secretion further decreases c) primary follicles starts developing d) ...
2
votes
1answer
69 views

Ancestral Allele and Hapmap

I notice on dbSNP rs6352 has an ancestral allele of G - http://www.ncbi.nlm.nih.gov/SNP/snp_ref.cgi?rs=rs6352 The hapmap in humans for this allele is very rare, the homozygous version practically not ...
0
votes
0answers
18 views

How to isolate two plasmids from E. Coli strand?

I have an E. coli cell line I use to express a protein using a two plasmid system. One confers AmpR and one KanR. For mutagenesis I would like to separate the plasmids to increase efficiency of the ...
1
vote
1answer
17 views

distribution of some injected materials/medicines through blood vessels [on hold]

Fastest distribution of some injected materials/medicines & with no risk of any kind can be achieved by injecting it into - artery or vein?
1
vote
1answer
29 views

How does mutualism arise? [on hold]

How can a mutualism between two species arise? I have thinking about this for a while and I have come up with the following points 1.If mutualism gives one specie a competitive edge over its ...
1
vote
2answers
208 views

How quantitative is the theory of evolution right now? [closed]

We developed complex structures like eyes and brain, whose mechanisms rely on specific species of molecules and relevant chemical reactions. But we did not develop an enhanced night vision, the ...
12
votes
5answers
18k views

Do we get 1/4 of our genes from each grandparent?

I know that we get half of our genes from each parent, but does it necessarily mean we get 1/4 of our genes from each grandparent? Or is it possible that we might get say 30% from one grandparent, 20% ...
3
votes
1answer
18 views

Are there any primary structure sequences that strongly suggest b-sheet or alpha helix?

Is there a particular sequence of amino acids that we know will take on a beta-sheet or an alpha helix or is it essentially random?
0
votes
0answers
9 views

Term of the type xxx-troph for a compound not used by an organism

A prototroph for compound X can make it, a bradytroph grows faster if X is scavenged, an auxotroph needs to scavenge it and a hyperauxotroph lacks both the biosynthetic pathway and the transporters. ...
-2
votes
1answer
22 views

What are silent carrier traits?

I couldn't find a definition but I have come to know the following from google search: People who are carriers of a thalassemia gene show no thalassemia symptoms and might not know they're ...
4
votes
2answers
91 views

How long can one leave sample in lysis buffer for DNA extraction?

I am trying to do some DNA extraction for my professor, and I make a lysis buffer with proteinase K. I did not have the time to continue the procedure so the hair and the buffer have been sitting ...
3
votes
1answer
158 views

How does the MMR vaccine affect lymph nodes in preventing measles?

I am trying to understand this statement about the Measles part of the MMR (Mumps, Measles and Rubella) vaccine Measles prevention: MMR (AB protect during primary and secondary viremia) Measles ...
1
vote
1answer
45 views

What would happen if nerves didn't have refractory period? [on hold]

What would happen if nerves didn't have refractory period? And, what part of his nervous system or neurons are not needed?
6
votes
1answer
168 views

Is there any virus that contains both DNA and RNA in its genome?

It is known that viruses contain DNA or RNA- either one and not both. I came across a question: Which virus contains both DNA and RNA?
1
vote
0answers
6 views

Can the presence of Y chromosomes in tissue play a part in trigger tissue rejection in opposite sex?

Can the presence of Y chromosomes in tissue after a tissue graft or transplant from a male to a female play a part in triggering tissue rejection other than other main factors? If so, how?
8
votes
2answers
340 views

Why do squirrels have twitchy bushy tails?

Whenever I see a squirrel in the woods, it is always the big bushy tail flipping around that gets my attention first. A pray animal with a big bushy flag calling attention to it's self seems to be ...
3
votes
1answer
112 views

What's the (or some of the) minimum(s) amount of atmospheric carbon dioxide needed by plants?

We currently have a problem of increasing CO2 in the atmosphere. But assuming we find a way to carbon sink it, what is the minimum CO2 we need to leave in the atmosphere to provide a source for ...
0
votes
0answers
15 views

Brain controls switched sides? [on hold]

I've been wanting to ask about this for along time, I was told about it when I was young but wanted to ask again. Not long after I was born (I was 7 weeks early) I had to have an operation cuz I ...
0
votes
1answer
27 views

Rifle Bullets and Lead Exposure

Does anyone know if simply touching bullets could give you lead poisoning?
0
votes
2answers
29 views

Variant VCF: AD vs DP?

In my VCF file from GATK, I have the following definitions for AD and DP. ...
0
votes
0answers
15 views

Links between Genetics and Personality Types

This topic was visited briefly in the thread, Genetic Effects on Personality, but I was surprised not to find more on it. (Is there a taboo I don't know about? What's the ethical stance on this ...
2
votes
1answer
55 views

Difference between the P4 and P5 subtypes of P-type ATPases in plants

In plants there are various kinds of P-type ATPases. What is difference between P4-ATPase and P5-ATPase?
3
votes
2answers
38 views

Mutating a protein without mutating the gene?

Is it possible to mutate a region of a protein (says about 300 amino acids long) without actually mutating the gene? One possible way that I can think of is to use RNAi and specifically block that ...
0
votes
0answers
22 views

What bug is this? Location:Singapore (Asia) Climate:Monsoon [on hold]

What bug is this? It looks like a worm in a open end conical case. I found it suspending from a ceiling from a web.
4
votes
1answer
85 views

Can defibrillation be done with a car battery?

Can successful defibrillation be done with a car battery? Is it POSSIBLE for this to work? Let's say you are stuck on a very remote place and something happens to someone... Moreover, can you jump ...
4
votes
1answer
150 views

Non-monotonic knock-out effects in prokaryotes

Typically, when performing gene-knockout, the experimenters select one gene to remove/replace-with-junk and then see if the prokaryote can still undergo fission. If it continues to reproduce then the ...
2
votes
1answer
139 views

Attaching suspension cells to coverslip during mycoplasma contamination detection

I am planing to screen my cell cultures for mycoplasma contamination using the Hoechst 33258 DNA staining method. This method is suitable for adherent cultures. Is this method suitable for ...

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