5
votes
1answer
162 views

Lack of A/B-antigen equivalent to Rhesus disease

Rhesus disease occurs when an Rh- mother is exposed to Rh antigens (often due to blood contact with an Rh+ child during delivery) and mounts an immune response which eventually results in the ...
5
votes
1answer
180 views

When did mouth pipetting stop becoming a way to handle liquids in a lab?

Almost all modern lab protocols have an addendum prohibiting pipetting by mouth, instead mandating that a Gilson pipette, a rubber pipette ball, or a serological Pipet-Aid be used. However, it was ...
3
votes
0answers
24 views

Photosynthetic efficiency and light harvesting efficiency

Is there some sort of measure of the light harvesting efficiency (possibly like transfer time) that is directly related to the photosynthetic efficiency in some sort of equation? Also, how important ...
3
votes
1answer
43 views

What would be the impact of depositing limestone in the oceans (to reverse acidification) on ocean life forms and biodiversity?

This question asked: What is the evidence it is feasible to reverse ocean acidification by adding large quantities of a base (bicarb soda)? The result was: Danny Harvey of the University of ...
2
votes
1answer
54 views

dAT joining: please define

I came across a reference to dAT joining in my reading of Genentech by Sally Hughes. The technique is described in passing as a technique for joining DNA fragments used around the late sixties to ...
5
votes
1answer
120 views

Mites on ginger root

I was just looking at some mouldy ginger found in the fridge under the microscope and was horrified/delighted to find (what looked to be) mites growing in it. I have searched the web and can only find ...
1
vote
2answers
39 views

Protein that exit from the cell - as marker

Searching for some protein, that I could use as extracellular marker for mammalian cells. I need to insert mRNA to cell, and to detect the protein outside the cell (not on membrane) if the mRNA ...
1
vote
1answer
590 views

What leads to the different types of navels?

Obviously, there are "innies" and "outies" in the human belly button world. Both are the result of a knot tied in the umbilical cord just after birth. But why do some belly buttons become outies ...
9
votes
1answer
17k views

Why do toenails grow much slower than fingernails?

As the title suggests, I've noticed that my fingernail grow much faster than my toenails. For instance, I usually trim my fingernails every two week or so, but for toenails the number would be about 6 ...
5
votes
1answer
109 views

What is the name of this flower?

A flower has grown on a leaf in our garden. What is the name of this flower? Give some description.
3
votes
0answers
408 views

Can HIV mutate to become airborne?

HIV has a very high mutation rate due to its inability to correct errors in DNA replication and it is very adaptable to its environment. Hence I wonder whether is it possible for it to mutate such ...
2
votes
1answer
134 views

Will a 0.2g/mL sugar concentration cause vomiting in humans?

This infographic claims that the sugar content in a can of Coca Cola would cause vomiting if not for the phosphoric acid. In The First 10 minutes: 10 teaspoons of sugar hit your system. ...
3
votes
1answer
58 views

Is MHC1 knockout sufficient to prevent transplant rejection?

A few days ago I read about MHC1 knockout pigs for organ transplantation research. I was just wondering, is it enough to knock out MHC1 in the donor (lets say from same species, pig to pig) for ...
2
votes
1answer
279 views

Have webs woven by LSD-intoxicated spiders ever been studied for their efficiency in fly catching?

I ask, because I have a different interpretation of the experiments performed on web-weaving spiders. The famous Robert Pirsig maintains that LSD is somehow helpful to web-weaving spiders, because it ...
12
votes
1answer
8k views

Why does scar tissue change color?

I was wondering why, when you are cold, scar tissue turns bluish or purple while original skin stays the same color. The only thing I can think of, is that maybe scar tissue gets less circulation ...
7
votes
1answer
133 views

Flower identification: Moscow, Russia

I found this plant near the MSU, Moscow, Russia. Could someone help me to identify it?
0
votes
0answers
18 views

translation rate regulated by transcription factors?

I'd like to know if there is in the litterature some examples of transcription factors capable to impact not just transcription but also translation rate so that both can be adjusted. I would be very ...
6
votes
1answer
74 views

Butterfly identification: Dorset England, July.

Can you please identify this butterfly. It was seen in Dorset England 9th July. I think it is a female Silver Studded Blue.
1
vote
1answer
194 views

Calculation of final magnification when using a CCD camera

I'm trying to empirically calculate the approx final magnification (mag) of digital images rendered through our confocal microscope. Using a micrometer and the microscopy equipment I have, the ...
5
votes
1answer
233 views

Approximately how long do bacteria live for? [closed]

I would like to know how many days or years do the bacteria live approximately.
2
votes
0answers
78 views

What happens when a genome is shorter than the other? [closed]

Say there were 2 creatures of the same species. Creature 1 has a longer genome than creature 2, it may be just a few base pairs, but what would happen when the genes were crossed to create creature 3 ...
4
votes
0answers
77 views

Why do people die? [duplicate]

what is the reason people die naturally even though they have no known disease? I see people become physically weak at times they get old and die eventually in case they are not attacked by any known ...
6
votes
1answer
175 views

Are low-intensity radio-waves carcinogenic?

A recent review article, Oxidative mechanisms of biological activity of low-intensity radiofrequency radiation reached a surprising conclusion our analysis demonstrates that low-intensity RFR ...
2
votes
0answers
21 views

Will bark-beetles infest the Methow Valley?

What is the Methow Valley (esp. Winthrop, WA) area's susceptibility to bark beetles? Did the 2014 Carlton Complex wildfires increase the vulnerability due to the large numbers of dead, dying, and ...
1
vote
0answers
42 views

Big cat in heat for months?

In this documentary about a lioness and a leopard the leopard is in heat for months. https://www.youtube.com/watch?v=MGqmylkOuKw Usually a big cat would be in heat for 5 days and then not in heat ...
1
vote
0answers
20 views

Why does a limb sting when it “falls asleep”? [duplicate]

Closely related to this question, but unanswered other than @Matthew-piziak providing a description and link that says: What is Paresthesia? Paresthesia refers to a burning or prickling sensation ...
-3
votes
2answers
160 views

Driving force for speciation for millions of species today

I would like to know if speciation really occurs (trans-speciation). Have we had enough time for millions of species? A creationist argument is that the slow changes in traits in organisms, taking ...
3
votes
1answer
308 views

Why are Merkel cells innervated by an axon, and not a dendrite?

Here are two images from Google. Afferent neurons receive input and send it to the central nervous system. Input is received by the neuron's dendritic end and send away centrally via axon terminals ...
9
votes
1answer
1k views

Why do antidepressants have a delayed onset of action?

Why do antidepressants take so long to reach efficacy? I've read of theories about it perhaps being due to the strength of negative feedback via serotonergic and adrenergic autoreceptors during the ...
0
votes
0answers
22 views

What is the permeability of proteins across the hyaloid membrane of vitreous to retina?

Does anyone know of any experimental work to test the permeability of the hyaloid membrane between the vitreous humour of the eye to the retina to proteins? Currently the largest molecule I can find ...
0
votes
0answers
25 views

Does anyone use bootstrapping to report mass gain during experiment?

When performing an experiment to report gain of body mass in an experiment, do any of you know of a paper whose authors have used a bootstrap to improve their confidence intervals? I have a n = 10 ...
2
votes
1answer
188 views

Why does the number of mutations per individuals follow a Poisson distribution?

I was reading this review. On page 11, left column, first paragraph, one can read: [..] there is a Poisson distribution of the equilibrium number of mutations per individual, if fitness effects ...
1
vote
0answers
21 views

Tissue grafting in marine invertebrates

I'm trying to source a procedure for a transplanting tissue in regenerating polyps. Would anyone happen to know where I can find a method of adhering to donor to host tissue? Thanks
2
votes
1answer
75 views

Is there a schema for how human behavior is genetically determined?

It seem one can distinguish three different kinds of genetic determinism of common patterns of human behavior: behavior that is directly wired into our nervous system, e.g. face-related mirror ...
2
votes
1answer
41 views

Map gene IDs to Ensembl gene ID

Forgive me if this question is too trivial. I have the gene IDs of the following type EOG6STSR2 EOG60ZRJB EOG6SBFJ2 EOG6P5KX3 EOG6B5PRW from the first ...
3
votes
1answer
104 views

Feeling of spicy

I have done a survey on my friend When everytime they eat something spicy, They will eat ice or drink icy water. First, Mostly they feel nothing but a cool sensation. However when they finished, they ...
4
votes
2answers
1k views

Why are the sex chromosomes called X and Y?

Is there a specific reason that the letter Y is used as the symbol for the male chromosome and X is used for the female chromosome?
1
vote
2answers
1k views

What percentage of human body's cells are contained in blood?

What percentage of human body's cells are contained in blood vs. the rest of the body?
3
votes
1answer
122 views

Can geckos climb a wet surface?

We know geckos can climb vertically or even upside down a surface like glass. But can they do that on wet glass?
0
votes
1answer
68 views

What is the definition of the life biologically ? [duplicate]

I want to know what is the definition of the life biologically , on the other hand , what is the definition of the death biologically ?? However, I think it is a very difficult question to answer . ...
0
votes
0answers
47 views

Endogenous PAF inhibitor in metastatic process (?)

When neoplastic cells cause a metastasis, they can create a protective coat of platelets that counterbalances immunitary response. My question is if the coat formed due to PAF can be undone by an ...
3
votes
1answer
182 views

Is there a hormone combination that makes humans grumpy?

Imagine a typical situation that is likely to give rise to a bad temper within an individual: a person is awoken very early in the morning by a sound of a lawn being mowed next door. Unlike expected ...
1
vote
0answers
23 views

What is the general mechanism behind perfusion PET imaging

I understand how tracer kinetics can be used to determine binding potential but how it can be used to detect perfusion eludes me.
2
votes
2answers
100 views

What would happen if brain neurons did not reduce their sensitivity to neurotransmitters after prolonged exposure?

From my understanding, neurons decrease their sensitivity to neurotransmitters by reducing the amount of receptors on the cell membrane in response to sustained neurotransmitter activity. One ...
4
votes
1answer
1k views

How to secrete a recombinant protein from E. coli?

What are some secretory pathways that can be used to secrete a recombinant bacterial enzyme from E. coli? I have a recombinant protein (29kDa) that I will express in E. coli BL21 cells. For now I ...
13
votes
1answer
191 views

Identify ~6-7mm long green creature

Here is the creature I found on the glass lid of my light bulb. I guess they are attracted to light as they all concentrate on the light source. I live in Hong Kong. The brown things aren't moving ...
5
votes
0answers
46 views

Two different Leucochloridium infected snails - different species?

In the last three days, I have found two snails infected by some species of Leucochloridium. I found them in my garden in the south-west of Sweden. Now I'm wondering if they are the same species or ...
0
votes
1answer
102 views

What is the surface area of the vitreous humour in contact with aqueous humour?

This is a question regarding the anatomy of the human eye, however for my purposes medium sized mammals should do. I am interested in estimating the surface area of the hyaloid membrane of the ...
1
vote
0answers
17 views

What is the effect of the RNA 2' OH group on its structure and stability? [duplicate]

I've read that the 2'-hydroxyl group plays "fundamental roles" in both the structure and the function of RNA, and that it is a major difference between RNA and DNA. I would like to know more ...
1
vote
0answers
110 views

About binary fission in amoeba [closed]

We know that amoeba reproduces by binary fission. Then does it mean that it never dies but keeps regenerating? In other words and more generally, does reproduction by fission by unicellular organisms ...

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