190 reputation
7
bio website none
location Germany
age 30
visits member for 1 year, 10 months
seen Aug 17 at 15:43

Jul
29
awarded  Curious
Jul
28
comment How do taenia form a species?
male and female taenia don't exist. A taenia is a hermaphrodite. So each proglottid can be like the other one, no difference in chromosomes needed.
Jul
28
comment How do taenia form a species?
Maybe I got something wrong, but in my understanding, a proglottid is not an animal, but a piece of the animal. The scolex buds asexually, passing its complete gene set to each proglottid. This means all proglottids of the same worm have the same set of genes. Now, a proglottid can fertilize itself or the neighbour proglottid, but it doesn't matter, because the genes of the mother proglottid and the father proglottid are still the same. This doesn't lead to new gene mixes. Or did I misunderstand the budding mechanism?
Jul
28
awarded  Commentator
Jul
28
comment Facultative Cannibalism?
@Remi.b the video you linked says that the oldest embryo eats the young ones as soon as its teeth are sharp enough. So not that much selection going on, except for the possibility that an older embryo with retarded development could be eaten by a younger sibling with normal development. But there isn't a bunch of embryos hunting each other at once.
Jul
28
asked How do taenia form a species?
May
22
asked Is there a superterm combining “animal line” and “cell line” in disease models?
Apr
21
comment Is there a protein in the eye that gets kinked by photons and shipped down to the liver to get un-kinked?
Luckily, the unkinking can happen outside of the liver, and much quicker. You know how, if somebody suddenly shines a flashlight into your eyes, you go blind for a couple of seconds after the light is gone? The reason is that all your protein storage in the eye is already activated and needs to be brought back to the unkinked state before you can see again. Imagine how it would be if this process required several heartbeats for transport to the liver, then an enzymatic process straightening the kinks, than shipping back: the blinding will be longer by at least one order of magnitude.
Apr
9
comment What makes teeth feel sticky after drinking Coca-Cola?
This question appears to be off-topic because it is about the physiological effects of food.
Apr
9
comment What makes teeth feel sticky after drinking Coca-Cola?
I see the question as wildly off topic. We are not a site for everything about food; we only focus on how to cook food, and all effects of the food on the body are off topic. The last rule mostly saves us from healthiness crackpots, but even if your question is not so likely to attract them, we still don't have the expertise to answer it.
Feb
9
asked Why can white hairs get dark again?
Dec
20
awarded  Editor
Dec
20
revised Does amylolysis occur in vegetables if stored under 0 Celsius?
made clear that the vegetable is supposed to be frozen solid
Dec
20
comment Does amylolysis occur in vegetables if stored under 0 Celsius?
@Chris what do you mean by "set free the enzymes"? Does this mean that they will start converting the starch upon thawing independent of ambient temperature, because they are free now? I am afraid my mental model of the whole process is very incomplete. You will certainly break cell walls, this is very noticeable with thawed vegetables.
Dec
20
comment Does amylolysis occur in vegetables if stored under 0 Celsius?
@Chris interesting. I thought that maybe my question is too silly to ask, and half expected to get an answer saying "once the cell plasma is frozen, all biological processes cease because enzymes, hormones etc. can't move around".
Dec
19
asked Does amylolysis occur in vegetables if stored under 0 Celsius?
Sep
28
comment Can a chicken's lard become liquid depending on its diet?
@AlanBoyd I have read it as the explanation to why saturated fats are unhealthy: the cell walls membranes of the eater become stiffer and less flexible by incorporating molecules made with saturated instead of unsaturated fatty acids. I don't remember my sources, they were some kind of popular science, not peer-reviewed literature, so it is possible that they were wrong, or that they were oversimplified enough to give me a wrong understanding of what is actually happening.
Sep
25
asked Can a chicken's lard become liquid depending on its diet?
Jun
30
accepted Does osmosis occur when we have two different substances?
Jun
30
comment Does osmosis occur when we have two different substances?
To make sure I understand your answer: you are saying that if we have a high concentration of B on the right, and low concentration of A on the left, water will flow from left to right?