4
votes
3answers
103 views

Why are the fertility rates of large predators kept low?

Predators at the top of a food chain, like lions, seem to have a relatively low fertility rate, which fits well to the ecosystem and avoids overpredation. But what is the mechanism that keeps the ...
1
vote
0answers
50 views

How does estrogen influence collagen synthesis?

Through what mechanisms does estrogen interact with collagen synthesis? Especially in the context of elevated estrogen levels and genesis of purpura simplex .
1
vote
1answer
31 views

Is there a stem cell dye for education purposes?

I need a dye that will stain stem cells (for this purpose the stem cells will proquired from chicken bone marrow). This will be an educational hands on activity for young teenagers so ideally the dye ...
0
votes
0answers
32 views

What is the gene regulation behind human adaptation to higher altitudes and therefore higher hemoglobin levels?

Some people in the Amazonian forest and in Himalayan mountains have reported living perfectly with extremely high levels of hemoglobin. I was wondering what type of gene regulation goes on in order ...
3
votes
1answer
18 views

Where do the phosphate units come from when EGF units dimerize?

Upon EGF binding, EGFR units dimerize and cross-phosphorylate. The phosphate groups are transfered to intracellular c-terminal tyrosine rich regions. Where do the phosphate units come from in this ...
4
votes
2answers
63 views

What is overdiagnosis?

What is overdiagnosis ? I have searched this Wiki result but didn't understood at all. Can you please explain the first two line of Wikipedia : Overdiagnosis is the diagnosis of "disease" that ...
0
votes
2answers
85 views

Why do endotherms need more food than ectotherms?

I have a rough idea: its as endotherms need more food to keep their temperature stable whilst ectotherms use less of their food in respiration, but that's just me parroting the textbook I don't really ...
4
votes
1answer
66 views

What is the best way to orally administer a water insoluble powdered drug to macaque monkeys?

They typically need to be given ~150mg, once a day, and it'll last for two weeks. The drug is very water insoluble, becomes almost like a paste, not suitable for tube feeding. And yes, this is for for ...
3
votes
1answer
38 views

What is the genome size of Saffron (Crocus sativus)?

I searched in the web but finally can't find an answer for my question. I don't know, may be there is no such data in the internet or maybe I cant find it. please if you can help me, or show me some ...
4
votes
1answer
114 views

Why are neutral [sterile] female flowers present in inflorescences when they are reproductively incompatible?

In many compound and special inflorescences like spadix and hypanthodium there are sterile female flowers along with male and female fertile flowers and are often present in between male and female ...
1
vote
0answers
22 views

What is the fruit of Café marron (Ramosmania rodriguesi) like? [closed]

I have read the article about Ramosmania rodriguesi (Café marron) and I've grown intrigued about what the fruit of this specie tastes like? Moreover, is it edible or "brew-able"? The only pictures ...
1
vote
0answers
30 views

Why does a dog raise leg for urine, whereas for feces wont?

Why does a dog raise leg for urine, whereas for feces wont? actually i read this http://en.wikipedia.org/wiki/Dog on dog breed, does not find anything related to my question.
8
votes
1answer
33 views

Why are cell lines frozen in vapor phase?

For most of the cell lines I've come across, ATCC recommends storing them in the vapor phase of liquid nitrogen. I'm taking that to mean any place above the level of liquid in the nitrogen storage ...
1
vote
1answer
33 views

Can anyone identify the worm in this video clip?

My wife came across this youtube clip of a spider and a worm. Can anyone identify at least the phylum?
-1
votes
1answer
1k views

Female preference for males who are already in a relationship [closed]

A common saying is that women are generally more attracted towards men who are already in a relationship, and this phenomena does seem to have its own place in popular culture that is not matched by a ...
5
votes
1answer
114 views

Why do we get 'bags under our eyes'?

Why do these circles form around the eyes if somebody is tired? And why does fatigue express itself around the eyes this way? Can I get eye bags very quickly in another way? ...
2
votes
1answer
23 views

How to set threshold in ImageJ for quantifying relative florescent?

I have taken images from two different samples that have uptaken EdU during DNA synthesis (S-phase). The experiment setup is to find which condition had uptaken more EdU. Therefore I am detecting EdU ...
1
vote
1answer
77 views

What flower is this blue flower? [closed]

What flower is this? All help would be appreciated
2
votes
2answers
43 views

How to preserve leaves between sampling (collection) and analysis?

Suppose I spend a day in a forest, collecting different kinds of leaves, which I would like to analyze under a compound microscope. Now, obviously, measures should be taken to preserve the leaves some ...
2
votes
1answer
38 views

Why does uterus have to be prepared every month for fertilization?

I'm just curious why it has to happen every month when the uterus could have been prepared from the beginning and kept that way throughout life or till a certain point. But why make and break it every ...
4
votes
1answer
10k views

Pedigree Probability of Autosomal Recessive Trait

Here is a pedigree: The trait is autosomal recessive. The question is: What is the probability that the bottom 2 people (4 and 5) have a child with the trait? I tried doing ...
10
votes
2answers
683 views

Why cancer is not a communicable disease?

I have seen this question where the author is asking a question about infectivity of virus. I wish to know why cancer is not a communicable disease?
5
votes
1answer
38 views

How do biologists infer correct ORF of a DNA sequence?

Each DNA (RNA) sequence has 6 possible Open Reading Frames(ORF). My question is: What are the theoretical bases of in vitro or in silico tries to find correct reading frame of a sequence? Is it just ...
2
votes
1answer
71 views

Has DNA communication/interaction at a distance been empirically demonstrated?

I recently had a discussion with a statistician in my school about memory. Among other things, he told me that it has been experimentally demonstrated that when one extracts DNA from any organism and ...
0
votes
1answer
35 views

Why does the cloning scheme to shuttle GFP into a pL4440 have to be between two T7 promoter regions? [on hold]

When designing a cloning scheme, why does it have to be between the two T7 promoter regions, and what is the benefit of using one or two enzymes to perform this?
1
vote
2answers
56 views
6
votes
1answer
145 views

What temperature should mammalian B-Cells be stored at outside of the incubator?

I'm working with murine B-cells. The general protocol is to keep cells on ice to keep them from dying but I've noticed that it makes these cells aggregate and precipitate out. I've heard suggestions ...
0
votes
0answers
27 views

Is there a biological environment that we can we assume glutamate exists as glutamic acid?

In the body we almost always assume that glutamate exists as glutamate rather than glutamic acid. It is so commonly glutamate yet glutamic acid and glutamate share the abbreviations of Glu and E. From ...
8
votes
2answers
146 views

How to name such grouping behaviour?

Under which keyword would you try to find out more about the grouping behaviour which looks like this? Does anybody recognizes such behaviour, or know an animal species which uses it? My tries: ...
2
votes
1answer
17 views

By what method do ants dissect and hold soil

Not sure if this is the correct stackexchange site - please migrate/advise as you see fit. I'm interested in the method by which ants "break off" a small amount of soil and then hold it in their jaws ...
7
votes
2answers
2k views

Why animals can move and plants cannot in general?

To clarify, I think the answer should be able to explain: What are animals? What are plants? What's the difference between animals and plants (How do biologists differentiate them, if they ...
-2
votes
1answer
22 views

What is some computer science technology that can help the development of biology? [closed]

What is some computer science technology that can help the development of biology(eg. artificial intelligence, resolution technology) and briefly talks about their potentials?
2
votes
1answer
26 views

Does long term use of antibiotics in humans actually lead to a greater risk of infection?

I've read about the overuse of antibiotics leading to antibiotic resistant strains of bacteria, so generally does long term use of antibiotics breed these strains in the bodies of antibiotic users and ...
1
vote
2answers
87 views

Growing E. coli at room temperature?

If I were to do a blue/white selection of transformed E. coli on LB agar ampicillin plates at room temperature (23⁰C) for about 2 days and 18 hours, will I run into the issue of satellite colonies or ...
3
votes
1answer
76 views

Name (and meaning of the absence) of the white semicircle at the base of the fingernail?

At the base of fingernail, there is a white semicircle (see on the first picture). But sometimes there isn't one. My questions are: what is this white semicircle on the fingernail, and what causes ...
-1
votes
1answer
38 views

Why do eyes water in response to particular emotions?

It is common for people to experience very moving situations (sad movies, etc) and have a physical reaction to it (such as crying). I am curious about how emotions can physically lead to the act of ...
1
vote
2answers
33 views

How do I find a protein from this DNA sequence?

I have a DNA sequence from a sequencer. How can I determine what protein is it? I tried some translator but it didn't help. What protein is this and how can I determine it? The sequence: ...
1
vote
2answers
123 views

Is fever a disease or not?

I have seen this question where the author is asking why people take drugs for fever. So my question is: Is fever is a disease or not?
0
votes
0answers
18 views

How to study the number of herbivores per type of tree and time of day?

Suppose I want to find out the number of herbivores in different kinds of trees, and also compare the numbers between day and night. How would this kind of study be run in practice? It easy to think ...
1
vote
1answer
51 views

How do butterflies defend themselves from other creatures when they don't have the ability to sting or some other offensive/defensive mechanism?

How do butterflies defend themselves from other creatures when they don't have the ability to sting or some other offensive/defensive mechanism? Butterflies are part of the class of Insects in the ...
35
votes
1answer
18k views

Why Does Salt Water Help Sore Throats?

I am having some trouble understanding how salt water, a simple solution, could so effectively remove the pains of a sore throat. I do believe that the answer is closely related to hypo/hyper-tonic ...
4
votes
2answers
83 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 ...
17
votes
2answers
317 views

How is menstruation not suicide in the wild?

Watch any wilderness special for more than a few minutes, and you'll notice a familiar pattern: when a predator catches the scent of blood on the wind, the hunt is on. Wounded animals make the best ...
9
votes
4answers
460 views

What prevents predator overpopulation?

I've often heard that a population, human or otherwise, will continue to grow as long as there is food available (assuming nothing else is killing them off). It makes sense: if you have food you can ...
0
votes
1answer
25 views

Is it a medical condition to not able to recall the word in a language while having a conversation [closed]

While having a conversation it happens to some peopl that clearly they know there exists a perfect word to be used but can not recall it during the conversation in real time and hence forced to use ...
1
vote
0answers
29 views

Hot water bath and Infertility

From here: Effect of temperature. Sperm cells will not mature at core body temperature in most mammals (spermatogenic DNA polymerase b and recombinase activities exhibit unique temperature ...
7
votes
4answers
559 views

If Evolution Is In Progress, Why Fight Extinction?

Natural selection is a central tenet of evolution. However, most biologists seem determined to prevent the extinction of the species that have been selected against. Why is this? Preservation of ...
1
vote
1answer
35 views

What's the difference between stabilizing selection and balancing selection?

I came across these terms in Darwin's "Origin of Species" and I wasn't sure what the difference is.
-1
votes
0answers
16 views

Atherosclerosis chemical treatment? [on hold]

Is there some theoretical chemical treatment against plaques in atherosclerosis? For example, if we will blow the "roof" and release all content to blood? Or kill all the cells that are in the plaque? ...
7
votes
2answers
87 views

Why do birds move their heads abruptly?

When we humans look around, we pan smoothly from one side to the other. Birds on the other hand seem to point their head in one direction for a while, then abruptly point their head in another ...

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