2
votes
1answer
25 views

Heterozygosity and the Wright-Fisher model

I was reading the textbook Probability Models for DNA Sequence Evolution by Durrett. In chapter 1, he discusses the Wright Fisher model and the coalescent theory ...
2
votes
1answer
64 views

Is plastic just as good for you as corn?

To specify, I mean plain corn-on-the-cob, not anything processed like corn flakes. Since one of the main important functions of corn is that it's not digestible, and therefore helps with digestion by ...
1
vote
2answers
91 views

Is greed an evolved trait?

Thanks for looking. I am not a biologist, but I am fascinated by evolution. I was watching the news this morning and, as so often is the case, there was a news story about a corrupt politician who ...
2
votes
2answers
54 views

If someone were to die on the moon, would their body decay? [closed]

I heard that the footprints of Neil Armstrong are still there, so I was wondering if someone were to die there, would they remain preserved, too? If not how long would it take for them to decay?
1
vote
1answer
32 views

Localization of B and T cell

What does localization of B-Cell mean?? "Localization of B and T cell in allergens may not coincide". What does this statement mean? (I have not studied biology since last 8 years and now I am going ...
1
vote
1answer
20 views

What is the expected effect of pH on the activity of a fungal pectinase?

I am working on an enzyme assay for a fungal pectinase.I assayed the enzyme in different buffers from pH 1-12.5 However,the enzyme has good activities starting from pH1-10.5. Is it possible to have ...
1
vote
1answer
20 views

How do tight junctions in stratified squamous epithelia affect nutrient supply?

In histology we know that epithelium tissue isn't vascularized so it takes the nutrition from Lamina propia (CT) via diffusion and in other hand we know all epithilial cells have tight junction which ...
1
vote
2answers
25 views

Where to find the corrected BLOSUM matrices?

I was looking at this paper which talks about the miscalculations in the BLOSUM matrices and how the "wrong" BLOSUM62 matrix performs better than the corrected version. I was trying to find the ...
4
votes
3answers
50 views

How many Type II restrictions enzymes are currently available (commercially) [closed]

How many Type II restrictions enzymes are currently available (commercially) for purchase as of the date of this posting (September 1, 2014)
0
votes
1answer
29 views

Applying Constraint Programming to sequence alignment/analysis

My Masters program is focused on formal methods such as SAT solving and constraint programming. I am interested in applying such techniques to problems in sequence alignment and sequence analysis, ...
1
vote
0answers
21 views

Fatty Acid Synthesis of Fats Longs than 16 C

I understand that the human body when performing Fatty Acid Synthesis can synthesize only until C16 (palmitate). However the ER has desaturases and elongases. I know that elongases are used to add ...
1
vote
1answer
88 views

Are retroviruses cytotoxic?

There are typically hundreds of retroviruses found in healthy human beings. Are retroviruses then cytotoxic? (In other words, are they able to kill or damage other cells).
1
vote
1answer
59 views

It is possible for person with AIDS be negative for HIV antibodies?

I'm just curious as there was a bit controversy around this topic. It is possible for person with AIDS be negative for HIV antibodies? As of 1989, the CDC reported that 5% of all U.S. AIDS patients ...
4
votes
4answers
98 views

Collective name for the X- and Z-chromosomes

Chromosomes are grouped as sex chromosomes or autosomes, with the X, Y, Z and W all falling in to the former category. The Z and X are present both in the homogametic and heterogametic sexes, and the ...
3
votes
1answer
35 views

Propensity Score for amino acid

What is the meaning of propensity score of amino acid? How is it calculated? (I have not studied biology since last 8 years and now I am going through it because I need it for my research. So if ...
-1
votes
1answer
42 views

What is the importance of hydrogen bonds in water? and other questions: [closed]

These are extremely simple questions — basic biology — but I would like to make sure that the way I have answered is at the very least correct. Hydrogen bonds are very weak, so how is it possible ...
1
vote
1answer
93 views

Why has our nose evolved with the nostrils facing down?

For most animals, the whole bottom of their face sticks out and they have a snout with a mouth and nose at the end. But humans have a flat face and just a nose that sticks out. We used to have the ...
11
votes
6answers
2k views

Is there a biological mechanism for evolution encoded into our DNA?

Throughout high school, I remember learning about Darwin's theory of evolution as if it were near-fact. But something always seemed wrong about the ideas presented. Survival of the fittest Random ...
2
votes
1answer
71 views

Species identification, tree from Ecuador

This tree is recently photographed in Quito, Ecuador. It grows everywhere. I'm new to South American flora, so I'd like to know what the species it is?
3
votes
2answers
91 views

Can ants sense food from a long distance?

I recently had ants find and then swarm to a food container that I put down on a desk, and I'm curious as to whether an ant would have needed to get lucky, discovering the food after crawling up the ...
0
votes
1answer
26 views

Is there any evidence that soft tissue can be preserved for 65m+ years and if not what hypotheses exist to explain it?

I read an article on howstuffworks.com and they mentioned how we have found soft tissue in dinosaurs. According to the article even Mummies and Mammoths have no soft tissue left. Is there any evidence ...
1
vote
2answers
48 views

Pharmacology: Drug Administration

Why is the enteral route seem by far the most common way to administer a drug to the body?
4
votes
1answer
62 views

Is it essential to add cholesterol to agar or liquid culture for C. elegans?

In preparing agar plates with NGM, and also liquid cultures for growing c elegans, how essential is the addition of cholesterol and heavy metals? I have prepared both. I can't notice any obvious ...
0
votes
2answers
54 views

Why are human children more likely to get lice (nits) than adults?

By my own experience, lice seems to be prevalent in the hair of human children, but not in adults. My question is Why are human children more likely to get lice than adults? Assumptions: Can be ...
0
votes
2answers
87 views

Does scratched Teflon coated frying pans contain carcinogens which can cause cancer? [closed]

Is it true that using scratched Teflon-coated pans contain carcinogens, and if so, can they be consumed through the food cooked in them? E.g. The deadly toxins from non-stick frying pans
3
votes
3answers
64 views

Is there a specific word for bacterial death?

What do you call it when a bacterium dies? Cellular death is apoptosis, necrosis, and bacterial is ...? I don't simply want to write in a paper that it - well dies!
2
votes
2answers
39 views

Premise of life cycle synchronization between predator and prey

While reading about the predator satiation hypothesis of the periodical cicadas' 13/17 year life cycles, I started wondering about its premise. By the way, I understand the math behind the prime ...
1
vote
0answers
23 views

Evolution of sexually concordant genetic variation on the X-chromosome

It was theorised in 1984 that sexually antagonistic genetic (SA) variation should more easily evolve on the X-chromosome. This is partly because female beneficial/male deleterious mutations face less ...
0
votes
1answer
45 views

Spermatogenesis; maternal homologs [closed]

What is the probability that, in an organism with a haploid number of 10, a sperm will be formed that contains all 10 chromosomes whose centromeres were derived from maternal homologs? I have ...
3
votes
1answer
27 views

Does isolation have any effect upon mouse behavior?

I work with a lot of mice. I don't do any behavioral analysis, I just inject DNA or RNA and do imaging assays. However, I have noticed some effect of isolation on mouse behavior. Normally, the mice ...
1
vote
1answer
37 views

Pharmacokinetics: why do certain drugs follow zero-order kinetics?

I understand that alcohol and phenytoin are two examples of drugs that follow zero-order kinetics. Why do these two particular drugs follow zero-order kinetics as opposed to first-order kinetics?
2
votes
0answers
26 views

Genome-wide methylation analysis: sources of technical error?

We are doing a genome-wide analysis of methylation via bisulfite sequencing for an insect species. Previous experimental techniques have suggested the presence of methylation in this organism, ...
5
votes
1answer
160 views

Microsatellite shifts (peak calling) GeneMapper! Thesis help!

I'm a masters student attempting to conduct a parentage analysis on a population of fish for my thesis. My advisor and post-docs haven't been very helpful, so I need some help! I have dinucleotide ...
0
votes
1answer
38 views

Are there other methods besides surgery and hormonal treatments to help undescended testicles? [closed]

I've been doing some reading on undescended testicles and common treatments. It looks like the most common treatment for a baby is to give it time to see if the testicles drop on their own. If not, ...
0
votes
0answers
12 views

How are isopotential maps computed from EEG channel data

I have some EEG recordings of $1$ minutes, with $500$ samples per seconds and $63$ channels. For each recordings, this effectively yields a $30,000\times 63$ matrix $M$. How do I extract isopotential ...
3
votes
1answer
30 views

What is the best current understanding of how yeast transformation works?

I would like to get myself up to speed with what is currently known to science about yeast transformation. Specifically, transformation of plasmids and linear DNA fragments. I am particularly ...
4
votes
0answers
37 views

Can microdialysis be made in Drosophila melanogaster?

I've asked this before in stack overflow's cognitive science community, and someone recommended me to ask here: I've found a couple of studies using microdialysis on insects, but didn't found any in ...
0
votes
0answers
13 views

Does the Y chromosome carry structural information, or only switches + traceable ID?

The Y chormosome almost doesn't crossover with the X chromosome, and so the evolution of anything it encodes must be much slower, because by the Hill–Robertson effect beneficial mutations must occur ...
3
votes
2answers
61 views

Does osmosis take place in prokaryotic cells?

As far as I know, osmosis occurs in Eukaryotic cells, and I'm wondering if it could take place in prokaryotic cells too.
0
votes
1answer
55 views

Can a guy be turned into a girl near perfectly? [closed]

I have always been told that during gender realignment there is some damage to the body which is why even if you had all the money in the world you can't keep changing between male and female. ...
2
votes
2answers
38 views

What is a membrane potential?

I know this may be silly, but I am confused to what a membrane potential actually is. I understand that at resting membrane potential is -70- -80 mV. But what does that exactly mean and how does this ...
7
votes
1answer
94 views

What is this creature?

Since it has six legs, I believe it's some sort of insect, but I could be wrong. I spotted it in my Central Texas backyard (Austin area). It was very slow and not at all skittish. For size ...
1
vote
2answers
79 views

Can viruses that normally infect eukaryotic cells also infect bacteria?

Can standard viruses infect bacteria? I'm not speaking of bacteriophage but typical RNA and DNA virus such as influenza and Ebola.
1
vote
1answer
17 views

can a bacterial protease inhibitor cocktail be used for Western Blotting involving HUVEC cells and HT-29 adenocarcinoma cells?

Dear fellow biochemists, I need some advice on Western Blotting, more specifically the use of certain protease inhibitors with the RIPA cell lysis buffer and protease inhibitor cocktail. A Millipore ...
0
votes
1answer
43 views

Does E. coli survive at any pH level?

Does E. coli survive at any pH level? If I was to incubate it in agar of different pH, would it still form a bacterial lawn as it's called?
0
votes
0answers
16 views

Is there a natural defense against an increase in E.Coli level in natural water systems?

I was recently on an Oceanology coliform collection vessel in the Long Island Sound and I found out that human waste contains E.Coli and when not properly treated the bacteria can run off or ...
3
votes
2answers
320 views

19th century Latin species description

While reading a 19th century text of new species description, I'm confused by some Latin phrases. The case here is: Corp. long. 8 poll., caud. 9 poll. I guess 'corp.' and 'long.' are ...
1
vote
1answer
44 views

Modelling how much cadmium a cell will be able to chelate with phytochelatins

I am involved in a synthetic biology project where I have to do modelling with ODEs. The biological process I want to model is the chelation of Cd2+ with phytochelatins, to know how much can be ...
0
votes
0answers
28 views

Is it possible to convert nerve signals or electrical pulses into a readable format? [duplicate]

Can we have the technology to recreate the informations (like images, sounds etc.)[as in the form of signals in our mind] from human mind to human understandable format? In short, can we read human ...
2
votes
1answer
44 views

NMR spectroscopy detection methods for proteins

While studying, I've stumbled upon a table comparing the sensitivities of different detection methods in NMR spectroscopy: "Direct", "DEPT" and "Inverse", where "Inverse" seems to be the most ...

15 30 50 per page