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Top new questions this week:

Are stable isotopes ever used in pharmaceuticals?

Carbon has two stable isotopes, C-12 and C-13. Since they both have the same electronic structure they can both make up the same molecules, but presumably they may perform different functions in ...

biochemistry pharmacology  
user avatar asked by imrobert Score of 17
user avatar answered by Nilay Ghosh Score of 5

What's this aquatic bug?

I have a small freshwater aquarium at home with only some aquatic plants at the moment. In the summer, I put some mud and sand from a local pond into the tank. At some point, I noticed a strange ...

user avatar asked by Aufheben Score of 3

How can I find out where the holotype of a species is?

When I visit the Wikispecies page for Synapturanus zombie, it tells me where the holotype is, as does the paper which describes the species. But on visiting the page for Quercus gambelii, the holotype ...

user avatar asked by imrobert Score of 1
user avatar answered by bob1 Score of 0

Can Gravity convection incubators negatively affect the growth of strict aerobic bacteria?

Background Gravity incubators rely on natural convection for heat distribution. There is no fan or blower system, and the heat rises from the heating element at the bottom of the incubator. https://...

microbiology bacteriology literature  
user avatar asked by Freezing Soul Score of 1

What are the functions of coenzymes as substrate shuttles?

In my biochemistry textbook "Harper's illustrated biochemistry" it is written that "Coenzymes serve as recyclable shuttles that transport many substrates from one point within the cell ...

user avatar asked by Lakshya Kumar Singh Score of 1

Greatest hits from previous weeks:

What could cause hairs to gray at the tips but not the roots?

I have noticed that some of my sporadic gray hairs are gray at the tip side but oddly, not near the roots. Some are even only gray in the middle. I find all of this very counter intuitive, and I ...

human-biology physiology human-anatomy hair  
user avatar asked by Jeff Axelrod Score of 15
user avatar answered by Chris Score of 4

What causes random long white body hairs?

I'm sure many of you have experienced this - you scratch your back or brush your hand over your arm and find a ridiculously long thin white hair, sometimes as long as 3 or 4 inches. I know a few ...

human-biology physiology hair  
user avatar asked by Polynomial Score of 20
user avatar answered by Armatus Score of 9

What organelles are in an onion cell?

I was wondering what organelles are in an onion cell, because, based on the labs we are doing in my biology class, I only saw a nucleus and cell wall. My friends and brother say there are all the ...

cell-biology plant-physiology eukaryotic-cells  
user avatar asked by Brandon Kheang Score of 1

Why can white hairs get dark again?

I have learned (probably in high school?) that hairs turning white is caused by the part of the folicle which produces the pigment dying and being replaced by an air bubble. This sounds very ...

pigmentation hair  
user avatar asked by rumtscho Score of 30
user avatar answered by Chris Score of 19

What is the female equivalent of the morning erection that some men experience?

There was question about what causes "morning wood." It was answered that the erection in the morning is caused by decline of norepinephrine during REM sleep. Which in part allows to prevent ...

human-biology endocrinology sex  
user avatar asked by jnovacho Score of 19
user avatar answered by Remi.b Score of 24

If I squash an insect and it produces red "juice", does it always mean it is a blood-sucking type?

If I squash an insect and it produces red "juice", does it always mean it is a blood-sucking type of insect? Or do some insects have red "juice" themselves, so the color is red on its own and not ...

user avatar asked by Honza Zidek Score of 20
user avatar answered by rg255 Score of 18

What is the effect of extra-cellular potassium concentration on heart rate and conduction velocity?

If the extracellular potassium concentration surrounding a myocyte increases, then the potassium gradient accross the cell membrane decreases, and therefore the resting membrane potential will become ...

cardiology action-potential  
user avatar asked by Kenshin Score of 8
user avatar answered by Cornelius Score of 5
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