7
votes
5answers
327 views

Are there examples of encryption in nature?

There are examples of mathematics in nature such as Fibonacci number, fractals, etc. Are there examples of encrypted information? What I am looking for is a pattern that seems random on the ...
6
votes
1answer
173 views

How was the first ribosome theorized to have been made?

Seeing as ribosomes are what help perform the act of translation itself, and the blueprints for they themselves are in nucleotide sequences, how was the first ribosome theorized to have been made? ...
3
votes
1answer
1k views

How much does donating blood affect the amount of oxygen in your blood stream at high altitude?

I am a regular blood donor and I am also a skydiver. We normally go to around 13,000 feet AGL (above ground level). Depending on how high above sea level the ground is, altitudes could be as high as ...
1
vote
0answers
50 views

Polymerase Observations

DNA polymerase I (PolI) contains polymerase, 3'-5' exonuclease, and 5'-3' exonuclease activities in a single polypeptide chain of molecular weight 109 kDa. If E. coli Pol I is exposed to the protease ...
3
votes
3answers
77 views

When can I assume individuals marrying into a pedigree are non-carriers?

If I'm not told that they're non carriers, and if I don't have proof of their geneotype based off of progeny, when can I assume they're non carriers for a trait?
5
votes
2answers
108 views

Creating a cell, not from another cell. Will it be possible?

If some time in the future, we can know exactly what a cell (for example simple prokaryote bacteria) contains, (I mean, exactly which molecules, the shape of them, the density of each, everything), ...
4
votes
1answer
245 views

Does frequency of eye blinking reveal anything about human biology/nervous system?

I'm looking at an output of a single dry sensor EEG headband with the sensor positioned above left eye. As a side effect of it's placement, the device picks up eye blinks, and some eye motion as ...
0
votes
1answer
95 views

Do women have greater reproductive success than men? [duplicate]

What proportion of men who go through their whole lives and never find a mate at all, and what proportion of women do? And is the proportion of men greater than the proportion of women?
12
votes
1answer
3k views

How does Golgi's neural histological stain work?

What is known about the targets of Golgi staining of neurons? Are larger neurons more likely to be stained? Are specific cell types more susceptible than others? The current wikipedia article says ...
7
votes
1answer
278 views

When giving blood, what is the specific Iron measurement they take?

I went to give blood the other day, and they take an "iron" measurement prior to actually drawing the blood. My level was 16.4 -- but what specific type of iron were they measuring? I've heard of ...
1
vote
0answers
22 views

Which Enzymes Degrade Dynorphins and what drugs are there available to inhibit said enzymes?

Which Enzymes Degrade Dynorphins and what drugs are there available to inhibit said enzymes?
4
votes
1answer
63 views

Do ant pheromones indicate the direction to go?

I know that ants communicate with pheromones but I am wondering if these pheromones can indicate in which direction to go. For example the ants leave pheromones to indicate a food source and when they ...
4
votes
2answers
156 views

Biological key file format

I am in the process of creating biological key software tool for use on android devices. I would like to know if there are any established file formats for storing biological key data. Thanks
2
votes
1answer
49 views

Confusion related to the DAVID tool

I am trying to use the DAVID tool to do some gene analysis. I have some probe set intensities for some cancer cell lines. I found this link in the DAVID tool http://david.abcc.ncifcrf.gov/tools.jsp. I ...
1
vote
1answer
344 views

What is the difference between abiogenesis and spontaneous generation?

As we all should know, abiogenesis and spontaneous generation are far from identical. For one, spontaneous generation was disproven with Pasteur, and abiogenesis seems to be a solid scientific theory. ...
10
votes
2answers
180 views

Can DNA produce ribozyme-like structures?

RNA is known to act as an enzyme via its ability to fold itself in specific ways. Is DNA capable of such structures? Or is it some biochemical reason stopping the folding? Have they been observed in ...
6
votes
2answers
102 views

Is there a term for tool use in animals?

Is there a technical/scientific term that scientists use to refer to tool making abilities found in certain types of animals? Reference ...
5
votes
3answers
167 views

What are the limitations of commercial-grade DNA genotyping compared to full sequencing?

I've heard about services like 23andme, which offer genetic testing to the general public. As a person who knows very little about genetics, I'm interested in the subject and would like to know what ...
6
votes
1answer
393 views

How does Topoisomerase II inhibition affect cancer cells?

Topoisomerase II poisons represent some of the most important and widely prescribed anticancer drugs currently in clinical use. These drugs encompass a diverse group of natural and synthetic ...
5
votes
2answers
350 views

What does the 34/70 in Saccharomyces pastorianus Weihenstephan 34/70 stand for?

I've searched everywhere. No Wikipedia page. No information on NCBI. I searched all occurrences of 34/70 in some primary research articles! The best I've found is this brewery forum where someone ...
7
votes
1answer
745 views

Are there any solitary species of ant or termite?

The social insects consist of the ants, the bees, and the termites, which live in colonies rather than living solitary. But I've heard that there are some species of bee which are solitary and don't ...
0
votes
1answer
81 views

What species of bird is on this coin? [closed]

What species of bird is depicted on this coin? http://www.artic.edu/aic/collections/citi/images/standard/WebLarge/WebImg_000100/139651_846511.jpg Thanks in advance for your help!
5
votes
1answer
375 views

Solvent Accessibility, the 20% cut-off method

I'm reading the papers linked below and all three of them mention a 20% cut-off for buried/exposed residues, by calculating a relative solvent accessibility (RSA) value. I understand how the RSA is ...
2
votes
0answers
38 views

Can the Human body Synthesise Vitamin D from Phytosterols?

I know that the human body can synthesise vitamin D from cholesterol, but can it do so from phytosterols?
3
votes
1answer
531 views

Difference between “transcriptional activity” and “RNA expression”

I am working with a network object where the nodes are different events in molecular biology. Specifically; Catalytic activity of X, RNA expression of X, GTP-bound activity of X, Kinase activity of ...
9
votes
2answers
77 views

Can we disambiguate competing molecular mechanisms of learning and plasticity by measuring electrical activity of neurons?

I have been reading with fascination about the several molecular- and cellular-scale mechanisms and structural changes that underlie what we refer to as long-term plasticity. For instance, [1], [2], ...
3
votes
1answer
1k views

Can a person become addicted to tea?

Can one become addicted to tea like coffee addicts or smokers? I heard there are some common substances in tea and coffee, do they cause addiction?
4
votes
3answers
185 views

How does natural selection favour large body mass and size (or so it seems)

I was walking through a park this afternoon and observed a few birds having fun flying around and it got me thinking why would natural selection favour birds with flesh at all if it hinders their ...
1
vote
1answer
92 views

What factors must be taken into account for the maintenance of the immunogenicity of ovalbumin antigen?

What factors must be taken into account for the maintenance of the immunogenicity of ovalbumin antigen? If the ovalbumin is aggregated, could we inject it for induction of immune reponse?
4
votes
1answer
160 views

How can the child and the mother have different blood types?

As far as I know the fetus is fed by the umbilical cord which basically connects his/her circulatory system with the mother's in order to supply oxygen and nutrients. But how is this possible if they ...
2
votes
1answer
4k views

Melting point of a fatty acid?

What factors determine the melting point of a fatty acid? Chain length The number of methylene group The ionized state of the fatty acid Its degree of saponification Its ability to alter the ...
11
votes
4answers
246 views

What was the reason for some plant and animals to become giant in course of evolution?

The dinosaurs, mammoths, giant plants etc are known to be bigger than modern animals. I wonder why they had been lived and why they are not living now? I really don't know much but is it something ...
2
votes
1answer
13k views

I'm 20. Can I still grow taller? [closed]

I'm 20, in about 6 months I turn 21. For some time I've been wondering whether there are natural, non-surgical and non-pharmaceutical ways that humans can continue to grow after reaching adulthood. ...
5
votes
1answer
374 views

Are there grass or fiber eating birds?

My understanding, that may be wrong, is that cellulose/fibre has little nutritional value to many animals because it's hard to break down thus making consumption inefficient. However, Ruminating ...
4
votes
1answer
318 views

What plastic eating organisms are there to help with plastic in landfills problem?

I see some popular science articles on the plastic eating bacteria and fungi appearing on the web since 2009. Most of the articles praise discoveries, because such organisms promise to break down ...
4
votes
2answers
836 views

Advice on Cell Biology texts by Alberts

I am currently reading "The Chemistry of Life" by Rose. It's a great book (to me as a lay reader at least) and an interesting topic so I am interested in pursuing some of the further reading he ...
6
votes
1answer
212 views

Does GTP-γS (GTP gamma S) bind all GTP-binding proteins?

I've just read an article Rab10 GTPase regulates ER dynamics and morphology - Nature Cell Biology 15, 169–178 (2013) doi:10.1038/ncb2647. In this paper, to identify Rab proteins in ER, first they ...
4
votes
2answers
635 views

What kind of microscope should be used to view biological structures (such as spores) roughly 5 µm in length?

I would like to be able to identify genera of fungi based on the shape, size, and colour of spores. So the requirements are: Must be able to view a 5 micrometre object clearly with reasonable ...
2
votes
1answer
44 views

What's the simplest set-up to demonstrate soiless plant growth to middle school students?

I'm looking for a simple, inexpensive way to demonstrate that soil is not needed for plant growth to middle school students. I plan to germinate bean seeds in cotton, but where do I take it from ...
7
votes
1answer
75 views

Cell Respiration and Oxidative Phosphorylation

Why and how does the proton travelling through the stalked particle in the inner mitochondrial membrane, cause a conformational change in the ATPase?
5
votes
2answers
3k views

Does ethanol destroy RNase?

I've gotten conflicting advice on this: some people believe one can remove RNase contamination simply by spraying the bench, pipettes, gloves, etc. with ethanol. Others think ethanol does not destroy ...
1
vote
1answer
342 views

Where are doxycycline's anti-inflammatory properties derived from?

I have been looking at this antibiotic called doxycycline which is used mainly as an antibiotic. It has however some interesting anti-inflammatory properties. Does anyone know where these ...
1
vote
1answer
189 views

Is it true that oxygen has a diffusion rate in air 10,000 times greater than in water? [closed]

According to the Wikipedia page on the design of gills, oxygen has a diffusion rate in air 10,000 times greater than in water. Is that true? The WP entry refers to: M.B.V. Roberts, Michael Reiss, ...
3
votes
0answers
731 views

What are the factors to consider when determining the sample size for a given study?

Say I'm designing a retrospective study (where I'd collect data from various schools for the last 5 years) to see if consuming milk can contribute to childhood obesity. How do I decide on how many ...
4
votes
2answers
178 views

Confusion related to gene expression

I have a set of gene expression data downloaded from http://www.ncbi.nlm.nih.gov/geo. I have two sets of data, one is the raw probe intensity data set in the form of CEL files. Another is processed ...
5
votes
1answer
315 views

How to do western analysis to lung tissue?

I am working with lungs from mice, and I want to do a western blot analysis to my samples. I am having trouble with this because my images turn out very "messy", with a high background. Perhaps I ...
0
votes
1answer
191 views

Are lactic acid and prolactin rise after exercise connected?

I've been reading about prolactin, a human hormone. Apparently it's levels within the brain can raise after exercise, although the mechanism is not clear to me. I'm interested of there is any ...
5
votes
1answer
1k views

Why are pili more common in Gram negative bacteria than in Gram positive?

Although pili have been observed in some species of Gram positive bacteria, the preliminary research that I have done indicates that pili are significantly more common in Gram negative bacteria. Is ...
3
votes
3answers
171 views

Super-resolution imaging in vivo

Are there any microscopy modalities or techniques for in vivo imaging at higher resolutions than the diffraction limit? I was looking at this list: Super resolution microscopy, but they don't talk ...
1
vote
1answer
75 views

Is it possible to give a person an allergic reaction in a very specific place?

Can I give a person an allergic reaction at a very specific spot in a tissue? And if so, how accurate can i get?

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