6
votes
1answer
48 views

Which will produce more oxygen? Less number of (larger) trees or more number of (smaller) plants?

In a given area A, we have two choices - (i) we can plant maximum number of trees (which are larger in size) possible in A, say m OR (ii) we can plant maximum number of plants (which are smaller in ...
0
votes
0answers
9 views

Stem cells and if they can correct a lack of apoptosis

If a cell ,call it C1 has no functioning apoptosis mechanism could a stem cell somehow be 'induced' to be like C1 , at least have the same genome as C1. Then use this stem cell 'duplicate' to ...
1
vote
0answers
27 views

Which method would more accurately help to identify the unknown concentration of a protein sample between the A280 and the Bradford methods?

I quantified my protein using the standard Bradford method and the A280 methods and obtained values that were far off from the theoretical value of the protein of interest, and therefore was wondering ...
2
votes
0answers
22 views

Time lapse between fresh blood's exposure to air and that same blood turning darker red-brown [closed]

Using the example of a smear of blood from a cut on the arm (as when a person attempts to wipe away the blood), does anyone have a general idea of how much time it takes for that smear of blood to ...
4
votes
1answer
36 views

How does aging affect fingerprint?

Do fingerprints change as we grow from child to adult? Most notably, what is the effect of the increase in surface area of palms and fingers on the finger print? Does the finger print simply increases ...
3
votes
0answers
193 views

Why are fingerprints different even in identical twins? [duplicate]

Why are fingerprints different from person to person? It can't be genetics. Even identical twins has different sets of fingerprints. What is the deciding factor that form and shape our fingerprints?
5
votes
1answer
119 views

Is brain transplantation possible?

Many organs can be transplanted nowadays, including the liver, lungs and kidneys. Can the brain be transplanted?
2
votes
1answer
23 views

Metabolism of different saccharides

Learning about carbohydrates, I wonder what the differences there are in terms of metabolism, and overall health between the different types of saccharides. In other words, does the body use ...
1
vote
2answers
50 views

Do variant callers miss rare variants in reference?

Generally variant calling programs (such as GATK-UnifiedGenotyper) look for differences between reference genome and submitted sequence. However, we all know that reference genome consist rare ...
1
vote
3answers
39 views

How do scientists decide which version of a polymorphism is the main one?

This in fact has bugged me for years, but now I finally remembered to ask. I suppose that if one variation is more frequent, it can be labeled as the default, but what about variations that are ...
0
votes
0answers
9 views

Peristaltic pumps in animal perfusion - how important are physiological flow parameters?

Animal perfusion is usually done according to this or very similar procedures. Though not explicitly detailed in this video, the perfusion fluid infused into the Aorta is usually driven via a ...
2
votes
0answers
25 views

Neural correlates of the function of the cardiovascular system?

Are there any known neural correlates of the function of the cardiovascular system? I'm looking for research results that use standard brain imaging techniques (e.g. electroencephalography, ...
3
votes
1answer
49 views

Maximum RPM in zero-g before losing consciousness, spinning head-over-heels

There are more than a few scenes in Gravity that I find dubious. Specifically the ones where people are revolving very quickly, either about their own center of gravity or at the end of a rather long ...
7
votes
1answer
51 views

How well does the radius of a tree correlate with its age?

I'm looking for a cheap non-invasive ways to approximate the age of a tree (a birch). Measuring the radius pops up in the mind as the first alternative. How would one do that? Measure at multiple ...
2
votes
0answers
23 views

What mechanism is responsible for germinating in the right direction (root towards gravity)? [duplicate]

Regardless of the initial seed orientation, the root always grows/sprouts/germinates "towards gravity" (see picture), sometimes curving around in sharp 180°. What is the mechanism responsible for ...
2
votes
0answers
20 views

Protein Design - Target Structure Specification

I'm curious about how protein structures are defined in general, but in particular, I'm wondering how a target structure can be specified without knowing the amino acid sequence. For example, in ...
1
vote
2answers
32 views

DNA barcoding and real-time PCR

I recently read an article on how DNA barcoding was used to identify species present in health products. I also read an article about how Real-Time PCR was used to identify meat species in meat ...
2
votes
1answer
49 views

Biphasic T wave caused by digitalis toxicity

Digitalis is a drug that can be used during coronary insufficiency to increase the strength of cardiac muscle contraction. But when overdosages of digitalis are given, depolarization duration ...
4
votes
1answer
81 views

What actually are thoughts? [closed]

The human brain consists of neurons that transmit impulses like wires that conduct electricity.I am confused about where are our thoughts stored and what really are thoughts? For example if I think ...
2
votes
1answer
58 views

What happens to our umbilical cord internally as we age?

I was always curious as to if or how much of the internal structure or workings of the umbilical cord are still in existence as we age. What happens to it over time? The wikipedia article naval ...
11
votes
3answers
132 views

Do humans perceive temperature or heat-flux? (or both?)

The general understanding is that when I touch an object, I perceive its (relative) temperature. A metal object at room temperature, however, will often feel cool to the touch. This leads me to ...
2
votes
1answer
60 views

Why oxLDL accumulate to form foam cells?

In atherosclerosis, why macrophage store all the cholesterol from oxLDL inside, and turns to foam cell, and not just degrade it and going back to blood? (there are some amount that leave the plaque, ...
3
votes
0answers
30 views

Can we artificially increase human growth using HGH?

Robert Pershing Wadlow was a man who lived in the early-mid 1900s and had hyperplasia of his pituitary gland, which caused him over-produce human growth hormone (HGH) and grow to nearly 9 feet ...
0
votes
0answers
28 views

Can chlorella live in human stomach? [on hold]

Chlorella lives in symbiosis with cows and it produces vitamin B12. Living chlorella is normally sold as B12 suplement - so this question is pretty important.
14
votes
1answer
917 views

What is the most condensed form of (stored) energy used in biology?

When considering how organisms store energy for later use, I was wondering what substance known in Biology is best for compacting the most energy in the smallest space(volume-wise). With my (limited) ...
1
vote
0answers
9 views

Clumping factor test

I'm come across this question and I'm somewhat confused: In the test for staphylococci, the clumping factor detects: staphylothrombin DNase mannitol fermentation Fimbriae fibrinogen-binding protein ...
0
votes
1answer
64 views

Why is pericardium muscle repolarizated earlier than endocardium?

I was reading about heat muscle contraction and I read: The endocardium depolarization happens earlier than pericardium , but pericarduim repolarization happens earlier, therefore the T wave in ...
0
votes
0answers
18 views

Where can I find mutation datasets for cancer (other than TCGA)?

My lab has been using TCGA data (somatic mutations and clinical data) to develop panels of genes and of mutations we expect to see in certain cancer populations. We'd like to validate our panels by ...
0
votes
0answers
32 views

Are there ATP parasites?

Since ATP is a fairly universal medium for energy storage and intra-organism transmission, it would seem to be a perfect target for parasites. But I'm not aware of any parasites that exploit it. Are ...
13
votes
1answer
75 views

What are the requirements for a stable carbon cycle in sealed “bottle gardens”`?

The most famous example of a sealed bottle garden is David Latimer's bottle with a Spiderworth plant, pictured below, which has been sealed for 40 years. My own attempt at a bottle garden is failing ...
0
votes
0answers
10 views

Clarification on the “orientation” of chromosomal rearrangements

I need some clarifications on the concept of "orientation" in case of chromosomal rearrangements. Given a DELETION event on a chromosome for example, is the resulting DNA at the breakpoint always in ...
4
votes
1answer
61 views

Visualising a subset of the tree of life

I understand that many curated trees of life already exist (eg http://tolweb.org/tree/) but is there any website that allows one to input a list of organisms, and then produce the current best guess ...
1
vote
1answer
35 views

What is the present tense verb form of apoptosis?

For example, if I want to say something along the lines of "this signaling pathway causes a cell to go through the process of apoptosis", but I want to shorten the phrase "go through the process of ...
1
vote
0answers
12 views

How can the directionality of a protein structure be defined?

For a DNA molecule, you can define directionality using the convention of a 5'-3' direction on the Sense strand. However, using an N to C convention for a protein doesn't work since the ends may be on ...
3
votes
1answer
52 views

How can a drone be male?

A drone bee is male and is the product of only a queen bee. How is it that the drone bee can be male. I know that a drone is produced by an unfertilized egg, but this does not explain where the two X ...
3
votes
1answer
34 views

Are some virus loads introduced to human cell but never triggered?

Is there a term or any evidence of phage DNA integrating into chromosomes/ DNA but never being triggered? For example, could a virus that affected Neanderthals still infect human cells today but is ...
2
votes
1answer
38 views

Stockholm format to dot-brackets format?

I need to convert all my sequences in a Stockholm format into this: ...
10
votes
2answers
104 views

Can you Identify this Creature?

I was wondering if someone could assist me in identifying this creature. My father found this when he was reading on his bed. At first we thought it was a piece of lint, but then it suddenly moved. I ...
2
votes
2answers
56 views

Do animals exist which have great vision, but see only grayscale?

In computer vision the color information is often discarded, as most object recognition tasks seem to work just as well on the greyscale image (even better, because there is less unnecessary ...
4
votes
0answers
38 views

Do people that don't feel pain shiver in the cold?

There are a few diseases that cause an insensitivity to pain. This question asks about the relationship between the cold and pain, which got me thinking: Is shivering a response driven by the ...
-2
votes
0answers
24 views

Bacterial zoonotic infections in travelers [on hold]

Which bacterial zoonotic infections in travelers may be happen that increased in recent 5 years? How can I gain all reference information about this?
2
votes
0answers
18 views

background extraction in microscope analysis

I have taken microscope pictures for proteins in HeLa cells, in order to quantify the intensity (immunofluorescence). The proteins are both at the nuclear envelope, and in order to quantify the ...
4
votes
1answer
40 views

What microscope/magnification would I need to observe P. Acnes bacteria?

I am currently attempting to grow a culture of P. Acnes bacteria. Right now, my only hope in identifying colonies of the bacteria in the culture is to use a black light to find colonies that glow ...
8
votes
2answers
61 views

Why is iodine used for metabolic hormones?

Iodine and related biological iodine-carrying hormones are phylogenetically very old, at least according to Wikipedia. Humans use iodine as a metabolic indicator, as do axolotls and apparently most ...
5
votes
2answers
40 views

How and why can cold inflict pain?

I was carrying a can of very cold liquid, had something heavy in my other hand so couldn't switch hands. After a few minutes, I started to feel very intense pain. I was very surprised. cold is just ...
2
votes
0answers
25 views

Expression/Mechanism of ROR1 in healthy tissue

ROR1 is currently under investigation as a therapeutic target for cancer (1). A number of studies show different cancers may have their metastatic potential reduced, or become apoptotic through ...
1
vote
1answer
32 views

What is Trypsin? [closed]

I am currently helping a PhD student in his research lab. We have been using Trypsin for the past couple of weeks but I am unsure of its purpose. I was wondering how Trypsin functioned and what it was ...
0
votes
2answers
38 views

I photographed a couple of butterflies and birds in Argentina but can't identify them. What are my options? [closed]

I photographed a couple of birds and butterflies in Argentina and tried to identify them. I tried online species identification tools, looked in books, and just tried to find pictures on Google with ...
1
vote
0answers
32 views

Zinc and brewer's yeast

I'm hoping for some information relating to yeast nutrition (specifically Saccharomyces cerevisea) in beer fermentation. Zinc is well-known to be necessary for yeast cultures to perform successful ...
6
votes
1answer
57 views

What allows Valonia ventricosa cells to get so big?

Valonia ventricosa are single celled algae that range between one and few centimeters. In rare cases they can reach sizes exceeding 5cm. Weirdly, a lot of the literature covering these organisms ...

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