Recent comments in /f/askscience

ahufflepuffhobbit t1_jbukiow wrote

Reply to Can long term cannabis abuse cause permanent changes to brain structure? by AlexMiles101

Several studies have linked marijuana consumption with the onset of schizophrenia and persistent psychotic symptoms. Some of these report that a frequent user of cannabis has 6 times higher probability of developing schizophrenia. This, however is neither a necessary or sufficient condition, there are other factors at play, some kind of genetic susceptibility being probably one of them.

Source

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Hk-Neowizard t1_jbujg5u wrote

Reply to When a wave travels goes from a higher impedance medium to a lower impedance medium, why would that cause a reflected wave? by agabwagawa

Here's an intuitive approach.

Consider the source of the vibrations in the middle of the medium. It's a combination of the inertia of the particle and the forces applied by neighboring particles.

When a particle at the boundary vibrates, the properties of the particle at the different medium applies a different force to the boundary particle. This changes the oscillation period of the boundary particle, which in turn applies a different force to the other particles in the original medium.

Essentially, the boundary particle goes out of sync, which reads as a reflection when scaled up to the entire boundary

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Mathrinofeve t1_jbuiv2z wrote

Reply to Does having history of heat illness (especially heat stroke) make one’s body more sensitive to heat? by [deleted]

Heat stroke is caused by your body temperature being raised to a level that impacts its functions. Your body doesn’t build antibodies like it would against sickness and the human body has a safe temperature range it operates in.

So no having heat stroke years prior does not make you more likely to get it now.

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operationarclightII t1_jbucuu4 wrote

Reply to comment by -Metacelsus- in What exactly is going on when a protein (or other molecule) binds with a receptor? by Eat-A-Torus

There have been updated models of receptor and ligand interaction. A big one that pharmacologists would point to is conformational selection, in which the receptor is constantly flipping between active, intermediate, and inactive states, even without a ligand. The presence of a ligand stabilizes the receptor into the active state until the ligand and receptor disassociate. There's a lot of cool quantum effects and such if you really get into the weeds with some of the PPI theories.

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Ridley_Himself t1_jbu8224 wrote

Reply to Is Radioactivity Inversely Proportional to Half Life? by not_natty

Yes. Radioactive decay can also be expressed by a decay constant, λ, which is effectively an instantaneous decay rate (relative to the amount present).

λ=ln(2)/t1/2.

It gets a bit more complicated with Y-90 since it is itself a decay product of Sr-90, so it will be produced at the same time it decays.

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slightofhand1 OP t1_jbu64pe wrote

Reply to comment by Jamesaliba in If semaglutides just make you eat less, how can they not result in the same metabolic effects of weight loss via calorie restriction? by slightofhand1

Also your body reacts to hunger by shutting down, so you start burning less and you plateau. This does not happen if instead of hunger you feel full. Semaglutide slows the food passing through you so you feel full

So the idea is that it somehow blocks whatever hormones or whatever tell your body that you're starving when you lose weight the old fashioned way?

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