Reputation
6,991
Top tag
Next privilege 10,000 Rep.
Access moderator tools
Badges
12 34
Newest
 Enlightened
Impact
~198k people reached

May
15
comment What are the effects of long-term liquid breathing?
@HDE226868 -- One thing that absolutely must be said that wasn't addressed is this: All of those human studies used external pumps to move the fluid. Mammalian diaphragms are not designed to move a liquid medium more than a handful of times. They will literally tear themselves to shreds very, very quickly.
May
13
comment What recovers normal polarisation after hyperpolarisation?
Can't give a full comment at the moment, but... Na+ and K+ have different electrochemical equilibriums, and in addition to the Sodium-Potassium Pump there are many porins that act as passive diffusion routes to re-establish the cell's preferred equilibrium.
Apr
30
answered Determining how much energy a plant takes in?
Apr
29
comment Do we have fundamental conflict in biology?
@Remi.b -- More cells = more cell divisions required in the first place. Whale cells are not orders of magnitude larger than humans, despite being orders of magnitude larger as an organism. Since the vast majority of cells have some turnover, having more could also mean a hire rate of division even if the time it takes is higher. Peto's paradox looks fine (to me), but it does point out that DNA mutations do not always result in cancer. An extra stop-check prior to cell division seems to have a tremendous effect on cancers if you look at Naked Mole Rats. ;-)
Apr
26
awarded  Enlightened
Apr
26
awarded  Nice Answer
Apr
19
comment Why did the Brain develop in the front in most organisms?
@aandreev -- They co-evolved. As brains became more complex and bigger, there needed to be a better place to store them. Thick bones aren't very spacious. Hollow bones aren't very protective. The compromise for organisms evolving a larger brain was the skull: A hollow, encapsulating bone that can also be very dense (especially among goats, bovines, etc.). It's also a design that means there's only one area to protect instead of every single thick bone in your body.
Apr
19
answered Why did the Brain develop in the front in most organisms?
Apr
4
revised Core Biological concepts explained to a Computer Scientist?
added 6 characters in body
Apr
4
comment Core Biological concepts explained to a Computer Scientist?
@poka.nandor Thanks. :-)
Apr
4
revised Core Biological concepts explained to a Computer Scientist?
added 2 characters in body
Apr
3
answered Core Biological concepts explained to a Computer Scientist?
Feb
25
comment Baby birds hair and mammal hair is a convergent evolution?
Fledglings do not have hair, but "down" -- a very, very fine type of feather used to insulate the chicks (and convergent in purpose with mammalian hair there).
Feb
6
comment Does long term use of antibiotics in humans actually lead to a greater risk of infection?
Not usually in the individual, but in a population, improper antibiotic use can lead to resistant strains and more infections. Improper use usually means stopping therapy short and not using all the pills, using antibiotics for diseases they cannot help with, or very-long-term use in a healthy individual. Antibiotic resistance is basic a probability function, with the increase exposure to the antibiotics increasing the probability resistance will develop. Regimes are designed so that bacterial populations stay isolated/small and the chance for resistance remains small.
Jan
22
comment Is there any tree or other plant that produces a new crop in fast cycles?
@twelve -- I'd suggest something like gardening.stackexchange.com for people more knowledgeable than I. I'm a novice gardener, but from what I recall most people would need 2-3 basil plants to cover moderate to heavy use of the herb in their cooking from early spring through early fall (in climates where temperatures drop below freezing).
Jan
22
answered How much mass does a person lose in a day through breathing and perspiration?
Jan
22
comment Is there any tree or other plant that produces a new crop in fast cycles?
Several harvests occur from most agricultural plants, most have 2-3 harvest periods per year, with a few exceptions. I'm not aware of any plant that produces a new crop every month; the closest I can think of would be herbs like Basil -- but that's because it produces continuously until it goes dormant.
Jan
22
comment True or false & fill in the blanks
@canadianer -- I agree, the nomenclature is pretty arbitrary and can be misleading. Thanks for bringing it up. :-)
Jan
22
comment True or false & fill in the blanks
@canadianer -- Yeah, but the nomenclature conventions make "polypeptides" to usually 3-5 peptides chained together. Before is "dipeptide" and after can get up to "oligilopeptide" IIRC.
Jan
22
answered True or false & fill in the blanks