6
votes
1answer
686 views

Questions about insects eating flour and living in the cracks of a wooden cutting boards

I have a large wooden cutting board which is used in my kitchen mainly for preparing egg pasta. The wood type is Populus (poplar or aspen or cottonwood). The main ingredients used with the cutting ...
1
vote
1answer
139 views

Possibility of Human cloning

Technology has evolved so much as to clone animals. But, what about human cloning? Is it really possible to create humans in lab? Or is it that technology has not advanced to that level..? Why cant ...
3
votes
2answers
2k views

What is the scientific opinion on plus lens therapy?

Plus lens therapy is the theory that most myopia is environmentally triggered and that conventional corrective minus lenses increase nearsightedness over time. Thus the hypothesis that applying plus ...
2
votes
1answer
28 views

Mechanisms of Flagella

I know that dynein arms and microtubules are involved in the contraction of certain parts of the flagella to produce a wave motion, but I don't understand they are related to the 9+2 structure of the ...
3
votes
3answers
358 views

Stardust or the elements in our bodies

How do we know we are made of stardust? As our cells divide, are our atoms repurposed from existing materials or spontaneously generated? Do we consume materials after we are born that contain ...
4
votes
2answers
7k views

What happens when you mix type A with type B blood (and v.v)

What happens when you mix different blood types that are not compatible? For example, if a patient has type A blood and receives type B blood, or v.v.?
2
votes
2answers
212 views

are the spontaneous generation and evolution the same idea but in a different time scale?

I was in my biology class, learning the history of spontaneous generation and how this idea was discarded. I told my teacher that is the same as evolution but in a different timeline. I Argue that ...
1
vote
1answer
41 views

programmatic fast search of 100-1000 short reads to a public server and obtain list of nearby genes

What are the options for programmatic fast searching of 100-1000 short reads to a public server and obtain list of nearby genes where the reads map? Input: ~100-1000 short reads Output: GFF list of ...
2
votes
0answers
68 views

Can Galactose be synthesized with photosynthesis?

I know that galactose can be found in sugar beets and some gums so I thought plants could synthesize galactose but in my book the answer to the question "Which of these can be synthesized with ...
2
votes
1answer
62 views

How to identify genes?

You and me are different at DNA level. My eye color gene is different from yours. So, my DNA is different from yours. How can a scientist identify a certain gene in a chromosome (and its function) if ...
1
vote
0answers
151 views

How TCGA CNV values are calculated?

When I download CNV SNP array data for ovarian cancer from TCGA data portal, I see some very small numbers like -5, -6 in the "Segment_Mean" column of the segmentation data files. I am very new to ...
4
votes
2answers
141 views

Is ebola non-contagious until symptoms appear? Why?

There's been a lot of talk lately about the man who recently came down with ebola in Dallas, Texas. While I live elsewhere, I keep hearing quotes from CDC and state officials that ebola is not ...
13
votes
1answer
1k views

Horned Mohawk looking insect. What is it?

Any ideas? I didn't know any other way to explain it. I live in Indiana, USA if that helps. Someone said it might be a "stink bug" but I'm not sure and not willing to find out!
5
votes
2answers
350 views

What determines the autumn leaf color?

It is autumn out there. Green, brown, red, yellow, and mixed-colored leaves drop from the trees to the ground. What determines the colors of the leaves? Wikipedia tells me Leaf senescence is the ...
7
votes
1answer
206 views

Can you get enough water by eating only fish?

Scenario: In a boat in the middle of the sea, no freshwater or food stores, no desalination equipment, no rain, but you can catch fish and eat it raw. Can you get enough water this way to survive, let'...
9
votes
2answers
12k views

Why can't neurons undergo cell division?

Many cells in the human body can divide and reproduce, making healing possible. Neurons, however, cannot reproduce, which makes diseases affecting the brain particularly crippling. Why can't neurons ...
2
votes
1answer
51 views

Somatic Mutations in meristem tissue in plants

In angiosperm, in which layer of the meristem does a new mitotic mutation occurring has chance to be found in a pollen grain or in an ovule? I also welcome some insights about non-angiosperm plants.
0
votes
1answer
50 views

Epitope annotated protein

What is epitope annotted protein?? The book from which I got this term is : http://www.springer.com/biomed/immunology/book/978-1-4939-1114-1
3
votes
0answers
47 views

can the donnan effect be reversed so phospholipids follow ions? [closed]

I know that there are flipases and flopases that facilitate this sort of thing, but i'm curious about other possible influences. Can donnan effect be reversed so that phospholipids follow ions. For ...
1
vote
0answers
25 views

Sequence based method for prediction of continuous B cell epitope

What is Sequence based method for prediction of continuous B cell epitope? What is the algorithm/procedure of this method? Can someone please explain this to me in simple language?
1
vote
1answer
1k views

Can ovulation and menstruation occur simultaneously?

Is that possible that ovulation happens in the time of actual menstrual haemorrhage in human females - let say in a case that woman has 21 day cycle and her menstrual period is 7 days? If yes, does ...
6
votes
4answers
600 views

Is human vision sensitive to frequency or wavelength?

In a vacuum, there is a one-to-one correspondence between light frequency ($\nu$) and wavelength ($\lambda$), ie. $\lambda=c/\nu$. But in a refractive medium, $\lambda=v/\nu$, so while the frequency ...
2
votes
1answer
226 views

Can I use grayscale images when working with ImageJ?

I am using ImageJ to analyze Western Blots. I have scanned films in as grayscale images because this is how we did it in my old lab. People in my current lab are not satisfied with that explanation ...
1
vote
0answers
24 views

Evolutionary reasoning behind redundancy of CST and RuST

According to my neuro-anatomy class, both the Corsticospinal Tract (CST) and the Rubrospinal Tract (RuST) control upper limb movement. What the evolutionary reasoning behind this redundancy and the ...
8
votes
5answers
2k views

How can I find a complete human genome file

I'm trying to figure out how I can download a file that represents the complete human DNA sequence. I don't care too much about the format – I'm able to write C++ code to parse it. FASTA seems like a ...
3
votes
0answers
388 views

Which types of blood vessels can regenerate in humans/mammals?

Which types of blood vessels can regenerate in humans/mammals? From what I understand, arteries and arterioles can be created later in life, while this is not necessarily the case with veins. However ...
1
vote
1answer
76 views

5,6-dihydrouracil and 5,6-dihydroxyuracil - how they arise in DNA?

5,6-dihydrouracil can be formed from cytosine after exposure of DNA to ionizing radiation under anoxic conditions [Ref]. What are other ways by which 5,6-dihydrouracil is formed in DNA? What about 5,6-...
5
votes
2answers
3k views

How long does a signal from the brain take to reach the limbs?

If the brain sends a signal to move what's the time it takes the signal to travel via neurons to motor neurons in hands, arms and legs? How fast do those signals travel?
8
votes
1answer
969 views

Does a bigger breast give creamier milk?

It is fairly common for a woman to have one breast larger than the other. I have also heard that, for a breast feeding mother it is common for one of the breasts to yield a creamier milk whilst the ...
2
votes
1answer
4k views

Why do we suddenly forget things, like PIN or phone numbers, that we've known for years?

Is it common to forget a 4 or 5 numeric code which has been used extensively for months and well remembered? There's an article on the guardian describing this phenomenon and by the number of ...
0
votes
2answers
48 views

About animal ecology and one view of this in science fiction

In the movie the Matrix Agent Smith said something like, 'all animals strive to find a natural 'equilibrium' with there environment ,... a harmonious existence with their ecosystem', ( forgive ...
0
votes
0answers
56 views

Why does a pecking order almost always exist in groups of social mammals?

I think the best explanation might come from evolutionary game theory. But, an another viewpoint may be equally important.
2
votes
1answer
91 views

What is the mechanism responsible for the 'delay' in delayed rectifier potassium channels?

I've been trying to find a comprehensive explanation concerning the nature of the 'delay' in neurons' delayed rectifier potassium channels. As it's written in my intro to neuroscience textbook, these ...
35
votes
5answers
11k views

Why don't mammals have more than 4 limbs?

Arthropods have 6 or more limbs and arthropods with 6 limbs appear to move faster than arthropods with 8 limbs so I wonder whether this might have something to do with fast and efficient locomotion. ...
0
votes
2answers
470 views

Can you disconnect sensation from the brain without destroying muscle functions?

I want to know if it would be possible for a surgeon to "shut off" a person's senses without causing paralysis of any kind. The person would have to maintain their ability to speak and move, but not ...
5
votes
1answer
1k views

Why do some cuts leave scars, while others do not?

Last year I got a moderately-deep cut on my finger, and it left a scar. Six months later, the scar is still there. On the other hand, I've had lots of other cuts on my fingers, though none have left ...
3
votes
1answer
10k views

What is the difference between osmotic potential and osmotic pressure?

Which term is used to calculate water potential? Does osmotic potential mean the same as solute potential?
5
votes
4answers
184 views

What bird species is this? (Heron-like waterfowl from China)

I need help identifying this bird. (Some sort of heron?) It was seen in Wuhan, Hubei, China, in September. It is very common there. It can also swim like a duck, but I've only seen it do this once ...
5
votes
1answer
144 views

What is the context in which a species gets the name “elegans”

Quite a lot of Latin binomials from different genera contain the same species name. For example, there are a number of that reflect the physical properties of the species (Tables have the latin name, ...
2
votes
1answer
26 views

Are the cpli and ctli tests time senstive(i.e. is it needed to test right away in order to get accurate results)?

I'm sending the blood samples to a lab and this takes some time until the actual testing. Some information on the tests. TLI : http://www.vcahospitals.com/main/pet-health-information/article/animal-...
4
votes
2answers
121 views

Short, concise, practical manual for doing experimental biology

I am am physical scientist working in biology, and have recently started doing experiments. I would like a manual akin to "Numerical Recipes", but for the lab: straight forward, easy instructions on ...
0
votes
1answer
61 views

Does applying sugar to the tongue taste buds releave sugar withdrawal symptoms?

I found several online articles discussing sugar withdrawal symptoms that people experience after cutting back on large sugar intake. http://healthyeating.sfgate.com/refined-sugar-withdrawal-symptoms-...
9
votes
2answers
7k views

What percent of your blood can you lose before you need a transfusion

Losing a little blood is okay. If your a normal healthy person, and got into an accident, how do they know if you need a transfusion or if you'll be okay? This is hypothetical.
9
votes
2answers
905 views

What is the evolutionary explanation for bat's echolocation [closed]

The bat's ability for echolocation is amazing (so are other the abilities of other animals). I was wondering how all of it came to be.
1
vote
2answers
729 views

What is the difference between a fixed substitution and a single nucleotide polymorphism (SNP)?

I recently read a report that stated "We found 430 fixed substitutions […], with an additional 34 single nucleotide polymorphisms (SNPs) fixed within individual patients." What is the difference ...
2
votes
0answers
77 views

Biology Experiment Data (Hodgkin-Huxley)

I'm doing research into the Hodgkin-Huxley Model from an electronics/mathematics perspective and I'm looking to find actual numerical results from experiments on squid axons. I want to compare the ...
3
votes
1answer
79 views

What are typical values for bone mass in humans?

I wonder what are typical bone mass values for adult males and females? And do they change significantly with workout and diet?
8
votes
1answer
389 views

Regarding the kingdom Animalia, which phylogenic tree is more common: Molecular Comparisons or Body-Plan Grades

In the picture below, which I obviously do not own: it depicts two different phylogenic trees, one which is based on molecular comparisons and another one which is based on body-plan grades. My ...
1
vote
1answer
107 views

Bacterial Cell Problem

A microbiologist has discovered what she thinks are two new types of algae. The first cell (Organism 1) appears cubic and is approximately 1.5 μm long, 1.5 μm wide and 1.5 μm deep. The second (...
2
votes
2answers
156 views

Definitions of robustness and canalization

The concepts of robustness and canalization are fashionable today in the biology literature. However, I am not sure of their definitions and I am not sure either that all authors actually use the same ...

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