0
votes
2answers
26 views

How to find a PDB structure of a protease with a peptide like inhibitor

I wonder how, for purposes of just illustrating some concepts like substrate alignment in the catalytic triad active site, I can quickly and efficiently find a protease structure (irrelevant of what ...
1
vote
0answers
20 views

Are there critical points in ecosystems?

Some days ago, I was thinking (partially) about the complex balance that is needed for an ecosystem to exist. I got curious about the existence of some sort of critical point, something - that when ...
3
votes
3answers
51 views

what are good sources of free-to-use images and diagrams

I am looking for good image repositories for biology teaching. Photos and textbook-like diagrams. I am interested in images that can be used commercially without payment, or, at least, that require ...
0
votes
0answers
50 views

Ribosomal Turing Machines, DNA/RNA computation

I'm a computer science guy, recently crossing over to do some research in computational biology on RNA secondary structure prediction. While looking through the materials I got a crazy idea, what if ...
3
votes
0answers
39 views

Are small CO2 concentrations devastating to certain cognitive tasks?

A new study shows strong effects of what should be a negligible CO2 concentration. The paper "Is CO2 an Indoor Pollutant? Direct Effects of Low-to-Moderate CO2 Concentrations on Human Decision-Making ...
1
vote
1answer
34 views

Carbon Monoxide and High-Oxygen-Affinity Varieties of Hemoglobin

I recently learned about the concept of "affinity" in regards to hemoglobin. For hemoglobin in humans, carbon dioxide has a lower affinity than oxygen, which allows gas exchange to occur in our lungs. ...
1
vote
2answers
44 views

Is epimysium same as fascia?

I have read that epimysium is dense regular connective tissue made covering the a muscle like bicep brachi. at the same time we have fascia that is made of dense regular tissue and covers muscles. so ...
5
votes
1answer
63 views

Which part of human eyes is getting tired?

It's a thing of common sense that if you read, drive or look at computer screen for too long your eyes will get tired. They burn, itch and try to close all the time. But I was wondering which part(s) ...
2
votes
2answers
40 views

TB disease - treatment and infection

Background: I'm currently performing research in mathematical biology, specifically on the treatment dynamics of HIV and TB co-infection. Question: Can a person infected with TB disease, who are ...
3
votes
2answers
124 views

How is information sent from limbs to the brain exactly?

Say you have a needle, and you poke a very specific area on your left thumb. A signal gets sent from that nerve up your spine and into your brain. How does the brain know exactly where this signal ...
2
votes
2answers
70 views

What is doubling of genetic material invented in flowering plants?

David Attenborough in his Kingdom of Plants 3D said, that flowering plants made two inventions: (1) doubling of genetic material and (2) symbiosis with animals. What was meant by "doubling of genetic ...
1
vote
1answer
52 views

What's the difference between diuretic veggies and alcohol that make the latter bad?

So I'm reading this article to Treat Fluid Retention and it suggests Eat foods with diuretic properties. But also Avoid drinks that will dehydrate the body such as tea, coffee and alcohol. ...
0
votes
1answer
23 views

Ion Channel gating

I have been studying ion channels and there is one thing i am confused about, gating between open and closed states in channels. Am i right in thinking gating is so fast that it is effectively always ...
2
votes
1answer
45 views

Could an annual plant be genetically modified to be a perennial?

My chives, asparagus, oregano, and rhubarb come back every year like clockwork. Suppose I want my bok choy to join the party - is there an "I'll be seeing you next year!" gene that can be modified to ...
1
vote
0answers
43 views

Is WIFI safe for humans? [closed]

I have wifi on at my home almost all the time. I learned that the frequency of visible light is around several hundreds of THz, while the frequency of wifi is only several GHz, which is only ...
1
vote
1answer
38 views

Source of hydrogen in reduction of oxygen in electron transport?

What's the source of hydrogen in the reduction of oxygen to water in metabolism? Is this implying that half the hydrogen comes from NADH and the other half from lone protons?
2
votes
1answer
29 views

Thrombus and Embolii

Can treatment of thrombus cause embolism, in case of very high blood pressure, that may even lead to a heart attack ? As the very high Blood pressure may cause some of the enzymes not act completely ...
1
vote
1answer
37 views

How Behind is the Human Mind (Latency of the Senses)

I would like to know if there is any research into the latency of human perception. Particulary: What is the minimum time for various inputs (vision, touch, sound) to be recognized by the conscious ...
2
votes
1answer
49 views

Where do butterflies sleep?

Do butterflies (insects) sleep, and if so, where?? I have googled for information but didn't get an exact answer.
0
votes
0answers
16 views

Reusable microarray chips

Microarray chips allow us to conduct many expression experiments in parallel to each other but they can be used only once as far as i know. Are there reusable microarray chips? Have people ever tried ...
6
votes
1answer
64 views

what is the difference between “cistron” and “gene”

I'm asking after reading the cognate wikipedia.en article on "cistron". I still am not sure about the difference of the two terms. To me it seems valid to picture a "cistron" as the genome wide set ...
2
votes
1answer
33 views

Quantitative Comparisons of Phylogenetic trees

I am working on a broad phylogenomic analysis of proteins involved in one particular cellular process. I have constructed a phylogenetic tree for each protein. I am now working on comparing those ...
4
votes
1answer
49 views

Blosum matrix with probabilities instead of the positive and negative scores

I am trying to find a version of the BLOSUM matrix that has the frequencies instead of the scaled log-odds. i.e. instead of the common version that tells us that the score LEU/ASP is -4, I would like ...
0
votes
1answer
53 views

Are harmful gases abiotic or biotic factors in our environment?

As we all know, harmful gases play a negative role in our society and our environment. Are these gases playing as abiotic or biotic factors in our lives?
1
vote
1answer
57 views

Simultaneously using both hands - How does that work?

Is some part in one hemisphere the decision maker and "calling the shots" - controlling the opposite side's hand "directly" and controlling its own side's hand through the corpus callosum. Or: is ...
0
votes
0answers
19 views

Projection space of ML II channel in ECG

I am trying to find the approximate effective 3D region of the heart that is drawn from the ML II channel of the standard ECG either by using many channels or using one channel only (not possible ...
0
votes
0answers
28 views

Identifying a spider from my childhood memory

Once, as a child, I found a spider in my parents' garden. I remember catching it in a jar because I thought it looked unusual, but I never figured out what kind of spider it was and unfortunately ...
2
votes
1answer
118 views

Ancestral Allele explanation

I'm having some trouble understanding the concept of ancestral allele. What exactly does it mean? What does it have to do with Identity by descent/state? What does it have to do(if anything) with ...
2
votes
0answers
20 views

Questions regarding Scapulohumeral Rhythm

I'm actually an artist, but I wanted to ask this because it will help a lot in my figure drawings. My artistic anatomy teacher taught me about the Scapulohumeral Rhythm. He said that in during the ...
3
votes
1answer
46 views

Should the sum of RPKMs be constant over experiments

I have cufflinks data from 18 different RNA-seq experiments. I've noticed that if the sum all the RPKM values for a particular experiment, are vastly different between experiments. How could this be? ...
1
vote
1answer
17 views

Muscle force/energy relationship

I found the Hill muscle model, which helps relate the force a muscle can generate to its change in length over time (its "contraction velocity"). Is there a similar model to get an idea of the energy ...
0
votes
1answer
40 views

What I can do in order to improve the folding of the protein?

I am struggling with the expression of the certain protein. It seems that it is not properly folded and thus, it is not active. I tried to express it at the lower temperature and for the longer time, ...
0
votes
1answer
40 views

Pedigree analysis : autosomal or mitochondrial

I have tried a to decide if this is a autosomal dominant, recessive or a mitochondrial disorder. Is it possible to know for sure, or do you have to use probability? (English is not my native ...
0
votes
1answer
33 views

Can lymph be in peripheral blood?

I read an argument that 1-3% of lymph is in peripheral blood. However, I am not sure if this lymph is about lymphocytes in peripheral blood; not lymph itself. Lymph gets exchanged between capillaries ...
2
votes
2answers
82 views

Understanding the Amino Acids

I'm having little trouble studying general relativity or quantum field theory, but remembering all the amino acids and being able to think about them is something that's completely, utterly and ...
2
votes
0answers
21 views

dbSNP database table desciptions

I am trying to build a local implementation of dbSNP. I would like to know the descriptions of tables listed on ftp://ftp.ncbi.nlm.nih.gov/snp/database/organism_data/human_9606 and on ...
2
votes
1answer
35 views

What is the scientific name of such a fungus?

Several days ago, in a bush I found the fungus as attached which is about 25cm in height and does not look like an edible mushroom: Any one has an idea of its scientific name and other details?
3
votes
1answer
30 views

What is the reason behind more severe proteinuria in nephrotic syndrome than in nephritic syndrome?

Why is there less protein loss via urine in case of nephritic syndrome than in case of nephrotic syndrome?
0
votes
1answer
31 views

Mechanism of antiperistalsis

What is the mechanism of antiperistalsis that occurs during vomiting? Why the peristaltic waves normally don't propagate in anal to oral direction? Please give logical explanation with authentic ...
3
votes
2answers
73 views

Where do trees get their shape?

Does anyone know any good resources dealing with shapes of trees? For example, pine trees are cone shaped for optimal absorption of sunlight, but lone pine trees growing in isolation (and other ...
2
votes
1answer
42 views

Mode of inheritance - DYT1 Dystonia

Homozygous DYT1 mutation carriers have not been reported in humans. Does this mean that the mode of inheritance for dystonia (DYT1) is autosomal dominant? This to me implies that if one has both ...
1
vote
1answer
21 views

Primers on Dystonia

Where can I get a good biochemical overview of dystonia? I will be working in a research lab that focuses on dystonia and I would like to not be clueless.
1
vote
0answers
20 views

How do climate and location affect the Pine Processionary moth?

I have statistics on the occurence of the Pine Processionary moth (Thaumetopoea pityocampa); we have the regions that are located in Algeria, infested area in percent, the defiliation degree (small, ...
3
votes
2answers
122 views

What makes DNA helical?

Why isn't DNA like RNA; why isn't RNA like DNA, that is, helical? Why are RNA chains straight?
3
votes
1answer
101 views

Why Isolated, recombinant plasmid DNA without any restriction is often detected in agarose gel electrophoresis as three DNA bands?

I don't understand why three bands are found without any restriction digest. Please answer me as soon as possible. Thank you
1
vote
1answer
63 views

What species of butterfly is this?

This big fellow came to visit my kitchen (in Hong Kong) a bit earlier. It is brown with some longitudinal white stripes, banana/boomerang-shaped patterns towards the middle, and an eye-like marking on ...
1
vote
1answer
40 views

difference between ischemia and oxygen-glucose deprived medium

Ischemia is roughly defined as insufficient blood flow to a specific region of the body and in the literature it is generally considered as causing oxygen and glucose deprivation in the tissue and ...
1
vote
1answer
41 views

How are minerals formed by biological processes?

News to me is that about 4500 of the 4900 minerals on Earth have been created by life. What are some examples of such processes? Are some minerals formed inside the human body?
1
vote
1answer
156 views

What are garlic's effects on DHT?

Most antiandrogens inhibit DHT. DHT is connected to testosterone. [1] shows a beneficial effect on prostate cancer which can be caused by DHT. However, according to [2] garlic also increases ...
1
vote
1answer
26 views

Is the sense for salt depending on the electrolyte level in our body?

I often noticed, after (heavy) physical activity like cycling, running, swimming or working an isotonic drink (to recover the electrolyte level) tastes less "salty" compared to when drinking it before ...

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