1
vote
0answers
17 views

Propagation of tool use in primates?

There are several famous cases of great apes demonstrating a surprising degree of wherewithal in communication and tool use - even monkeys can learn some tool use from each other observationally, even ...
1
vote
0answers
19 views

phosphorous availability to mycorrhizae and parent plant, timing - paper search

I'm researching (for my work) phosphorous uptake in monocots to develop planting mixes for riparian planting. I recently saw a paper suggesting (the author lacked proof) that root zone mycorrhizae ...
1
vote
1answer
317 views

Near point and far point of myopic eye

Suppose a person wears the specs of power -6D, the far point for that person is 16cm. But the near point of normal eye is 25cm. So, is the near point of a person with myopia (having far point less ...
3
votes
2answers
234 views

How was the Huntington's disease gene's location found?

I read in the book "Why we get sick." by Nesse and Williams that: Steady detective work and fabulous luck have enabled geneticists to pinpoint the Huntington's gene on the short arm of ...
2
votes
1answer
100 views

what is the effect of soda water on digestion?

what is the effect of soda water on the process of digestion? As it has been seen that after drinking soda the process is increased...I just want to know that what is the chemistry behind this?
9
votes
1answer
135 views

Comment on the introduction to a bioinformatics paper

I've written a paper about DNA sequence analysis. This paper attempts to use Bayesian modelling for a set of DNA sequences. It will probably end up either in a statistics journal, or, more likely, in ...
1
vote
2answers
33 views

Could alpha-numeric taxonomy of fungi make things simpler?

Please feel free to construe this question broadly--I don't see why the question would not apply to branches of biology other than mycology. If the goal of taxonomy is to create classification of ...
1
vote
0answers
28 views

Codominance and Partial dominance [closed]

The following genetic tree is given regard the fur color of some animal. The color determined by one gene that have two alleles and 3 genotypes: black, white and inlaid. I've been asked to ...
0
votes
0answers
35 views

Emissions sunrise, sunset linked to human productivity (awakeness)?

I do want to find a solution to a (for me) confusing state of mind. I'm a bit of a night-owl, always been one. The whole day I prolongue work that I want to do, my brain seems to sleep-in until after ...
1
vote
2answers
79 views

What are mast cell membranes made out of?

What are mast cell membranes made out of? What would weaken or strengthen them? Web searches bring up a lot of information about mast cells but very little on the membrane. And the Wikipedia page ...
1
vote
0answers
18 views

Why do we yawn seeing others yawn [duplicate]

If I see another person yawning, I definitely feel to yawn. Why is that so? What are the activities that happen in our brain which tell us to yawn?
1
vote
1answer
20 views

A question about gag reflex

If left glossopharyngeal nerve and right vagus nerve are intact, but there is a lesion at left vagus nerve, would stimulating the left side of pharynx elicit a gag reflex?
1
vote
1answer
49 views

List of the biggest companies that work in selective breeding

Looking at this question, I've been wondering, What are the biggest private companies which work in both animal and non-animal selective breeding? Let me know if Biology.SE is not appropriate for ...
4
votes
1answer
94 views

Any examples of life forms on Earth that could have survived on Mars or Moon?

Do we know of any living forms on Earth that could continue to live on Mars?
2
votes
1answer
52 views

Why do the neuron pathways decussate?

I learn about the brain right now, and there are crossing of neuron pathways everywhere; in the thalamus, the medulla oblongata, the pyramidal tract... And I don't understand why? What is the reason ...
1
vote
0answers
86 views

Which mutagen is responsible for pancreatic cancer [closed]

Which mutagen, aflatoxin or acridine orange (an intercalating dye) would most likely lead to an increased incidence of pancreatic cancer. Why?
1
vote
1answer
71 views

Is there any documented case in which floating substances led to the introduction of a new species?

Floating substances in the marine or freshwater environment often carry hitch hiking organisms. It is argued that many species may use this dispersal vector to reach new habitats, however to my ...
3
votes
2answers
44 views

Tapeworms and their effect on humans

I've read that some people in some countries actually use tapeworms as a form of losing weight. What are the dangers to these people?
1
vote
0answers
20 views

condensed protocol for sequencing a portion of human DNA from buccal sample

Anyone have a short & sweet protocol for PCR amplifying a region of human DNA (chromosomal or mt, I don't care) extracted from a buccal sample: including validated primer sequences and preferred ...
2
votes
1answer
60 views

Do you have experience with PacBio?

I prepare a experiment and I found $PacBio SMRT$ as the great way to sequence my PCR products. I find the cost: library preparation 655 dollars + sequencing 435 dollars. It seems very low. Do you have ...
3
votes
1answer
63 views

Book recommendation on selective breeding?

I am looking for a good book that gives a nice overview of the science and technics of selective breeding. I am particularly interested in the use of population genetics to support decision in this ...
4
votes
4answers
131 views

What exactly is Tinnitus?

What exactly is tinnitus? What is it's cause, and why do some people hear it and others don't?
1
vote
0answers
23 views

Triune brain model

I have heard about the triune brain model in biology class, but my teacher does not know much about it. What I'm curious about, is this model accepted by most of the neuroscientists, or is it just a ...
3
votes
1answer
63 views

Literature about industrial enzyme application

Can someone point me out to literature (reviews or better workbooks) describing industrial chemical reactions catalysed by enzymes? What I'm most interested in are case studies of how the output of a ...
1
vote
2answers
87 views

Can excessive carbonated drink consumption lead to elevated red blood cell levels?

I've recently had a blood test and the results displayed elevated levels of erythrocytes as well as hemoglobin. (As a result my hematocrit levels were also above average) At my workplace there is a ...
2
votes
1answer
55 views

What is the energy consumption of the brain?

What is the energy consumption of the brain, and is there a difference in consumption when waking and sleeping?
1
vote
1answer
63 views

Population Genetics Question

Can someone please help with this question? Here is my working (just in case it is not clear: 1/300*1/30*1/2) but is this actually correct or do I need to multiply by 0.5 once again? I appreciate ...
2
votes
1answer
46 views

How does DNA resolve on size exclusion resin?

We generally have a good idea of how DNA separates using agarose gel electrophoresis, how well does DNA resolve on a SEC resin like superose? I get the impression that salt influences where it elutes. ...
1
vote
0answers
33 views

What is TILLING?

How does TILLING (Targeting Induced Local Lesions in Genomes) work? What is needed to perform a TILLING experiment, and what kind of information can we get out of it?
0
votes
1answer
47 views

Normal Frequencies in Heart

I am trying to visualise possible ranges of frequencies from different structures of heart: different valves and their possible frequencies heart sounds I - IV and their normal frequencties what can ...
1
vote
0answers
32 views

How do the symptoms of Sepsis affect heart function?

I have intuition that Sepsis with infection can cause spastic functioning of heart during systole heart working spontaneously in snatches during systole atrial fibrillation first contraction of ...
1
vote
1answer
143 views

What does it mean for a chemical pathway to be conserved?

In many papers the MAPK pathway, (along with many others) is referred to as being conserved: Example: "The mitogen-activated protein kinase (MAPK) cascades are ubiquitous in eukaryotic signal ...
3
votes
1answer
75 views

How to measure quality and quantity of DNA?

I would like to mesure DNA. I quantify the concentration with Qubit fluorometer, but I would like to know also quality of DNA. I try BioAnalyzer (Agilent),but without success. Bioanalyzer measure DNA ...
3
votes
1answer
106 views

dopamine paradox in Schizophrenia

If there is more dopamine action in the mesocortical pathway in Schizophrenia, then the patients should always be in euphoric state. But instead patient lacks motivation and don't want pleasure. Why?
3
votes
1answer
354 views

How do I get a brighter DNA bands

I've been trying to a good contrast for my DNA bands, however I haven't been so successful. I've been running the ladders only to make sure I get a good contrast before further experimentation. I ...
2
votes
1answer
31 views

How can a YAC be screened against a cDNA library and a cosmid library of genomic DNA to find a gene?

I am reading fw2.2: A Quantitative Trait Locus Key to the Evolution of Tomato Fruit Size (doi: 10.1126/science.289.5476.85). The authors are trying to find the gene that makes tomatoes bigger. As far ...
2
votes
1answer
33 views

Cosmid genomic library, or genomic cosmid library?

Which usage is better for referring to a "cosmid library of genomic DNA fragments"?
1
vote
3answers
71 views

How does mutation cause natural selection? and is it common in protists or prokaryotes?

Why is it inevitable that evolution by mutations alone should be a common cause of evolutionary change in most natural populations? And do you expect mutation-driven evolution to be more common in ...
5
votes
1answer
64 views

Is a sequential double transformation acceptable?

Standard protocol states having two compatible vectors being transformed simultaneously during the same procedure. I've come across a situation in which transforming one vector, obtaining results, and ...
2
votes
0answers
261 views

What are the roles of guanidine-HCl and ethanol in binding of DNA to silica?

I'm trying to understand how exactly the binding to silica gel (in kits) step works and I cannot find any papers which provide an explanation of the physics or chemistry; especially on the way that ...
9
votes
3answers
1k views

Was the mitochondrion or chloroplast first?

I still don't know if the mitochondrion or chloroplast was first? I've looked for it on the internet and in various books but haven't found anything. Does anyone have the answer and a theory which ...
1
vote
1answer
72 views

Life on other planets [duplicate]

first of all I'm not sure if I should post this here or in the astronomy stack. I think biologist are more likely to answer my question. To make it short: Why when looking for any sort of life on ...
1
vote
1answer
64 views

What does min mean?

I read that "trp operon is located at 27 min on E.coli chromosome." What does "min" mean ?
0
votes
0answers
119 views

How do I determine the parental type here?

Please consider the following question: You cross Drosophilia and receive the following offspring: 965 wild-type, 944 black- vestigial, 206 gray- vestigial, and 185 black- normal. Explain your ...
1
vote
0answers
13 views

What causes human hair to go gray? [duplicate]

What causes the graying of human hair? Additionally, why does extreme stress bring it on faster?
1
vote
1answer
73 views

How do Gram + bacteria use a proton gradient for F-type ATPase?

Does anyone know of any papers showing how Gram positive Fermiculates or Actinobacteria use a H+ gradient for an F-type ATPase, It seems impossible since there is no outer LPS membrane to maintain ...
0
votes
1answer
25 views

Property of E.coli harboring F element

From Genetics by Ursula Goodenough E.coli harboring an F element are endowed with a number of phenotypic traits : 1.They are sensitive to infection by ssRNA phages and certain ssDNA phages. ...
1
vote
2answers
89 views

Effect on fitness of mutations

What is the distribution/probability density function (PDF) of impacts on fitness of new mutations? I very welcome any partial answer that does not give the whole PDF but just some information ...
1
vote
1answer
38 views

Dominance/recessivity of new mutations

What is the distribution/probability density function (PDF) of recessivity/dominance of new mutations? I very welcome any partial answer that does not give the whole PDF but just some information ...
1
vote
1answer
54 views

Additive genetic variance with $n$ loci

The genetic variance of a quantitative trait (the quantitative trait in question is fitness) can be express as the sum of two components, the dominance and additive variance: $$\sigma_D^2 + ...

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