Why does a ball bounce higher the more air pressure it has? |
- Why does a ball bounce higher the more air pressure it has?
- If someone has a cervical or thoracic spinal cord injury with total loss of motor function below the lesion but some intact sensation, will they still have motor reflex arcs below the level of injury?
- What do we know about SARS-CoV-2 mutations outside of the spike protein in new variants?
- In a piezoelectric element, does mechanical force have to be pulsed or can it be constantly applied?
- How covid kills people?
- What was assumed to be the structure of alpha particles before and after the discovery of proton?
- Are there any animals with sexually dimorphic hunting strategies?
- Since stars have vastly variable distance from us, and the time for light to reach us varies per star, the position of the stars relative to each other we see must be wrong? Does this matter for astronomy? Do we calculate the real position between stars?
- Testosterone helps build muscle. Does it also help maintain muscle mass once the muscle is already built?
- Can someone explain transcallosal disinhibition to me?
- Can executive functions be improved?
- What is the molecular mechanism by which plants dramatically change variegated leaf patterns as growth conditions change? Light- or temperature-mediated transcription factors?
- Do vaccines only reduce spread by the asymptomatic or do those who still become symptomatic end up being less contagious?
- How do steroids stop/slow Psoriasis?
- What regulates the ratio of males and females in a population?
- Why are the side effects of Coronavirus vaccines so much worse than the flu shot?
- Why can you make n-channel FETs from single layer 2D materials?
- Do different isotopes have different magnetic properties?
| Why does a ball bounce higher the more air pressure it has? Posted: 26 Apr 2021 07:50 AM PDT |
| Posted: 26 Apr 2021 07:58 AM PDT I haven't found a clear answer on Google, just information on the effect of UMN vs LMN injuries. Someone told me they'd lose bowel and bladder reflexes, but they couldn't explain how the brain would override the reflex arcs, and I don't know enough about the spinal cord to figure it out myself. Edit: Never mind, I found some info! Looks like there can be reflex arcs/spasticity in incomplete SCIs. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2860542/ "For instance, Ia-reciprocal inhibition was reduced in individuals with spasticity after incomplete SCI; they were unable to suppress the H-reflex when activating antagonistic muscles and showed abnormal coactivation of antagonistic muscles during isometric contractions.25 Further more, Crone et al26 found that Ia-reciprocal inhibition was replaced by reciprocal excitation of antagonistic muscles after SCI, which facilitated co-contraction of antagonistic muscles during movements. Conversely, Boorman et al27 found that Ia-reciprocal inhibition was increased in individuals with spasticity resulting from incomplete SCI. Therefore, alteration in Ia-reciprocal inhibition is likely to occur in spasticity following SCI, but the nature of alteration and its significance to the pathophysiology of spasticity is unclear." Edit 2: It doesn't talk about bowel/bladder specifically, but I'd assume that would be the same. [link] [comments]  |
| What do we know about SARS-CoV-2 mutations outside of the spike protein in new variants? Posted: 26 Apr 2021 12:45 AM PDT Most of the COVID-19 vaccines target the spike protein. Media constantly bombards us with information about a new variant containing mutations in the spike protein. What about other parts of the virus? I'm sure mutations also happen there but what are the implications and are there any notable ones? I appreciate this might be a very broad question but I thought I'm going to give it a try [link] [comments]  |
| In a piezoelectric element, does mechanical force have to be pulsed or can it be constantly applied? Posted: 25 Apr 2021 07:27 PM PDT I just saw a video of a guy heating up a resistor by pressing a piezoelectric element in a clamp. It remained hot for awhile. [link] [comments]  |
| Posted: 26 Apr 2021 05:41 AM PDT I just saw post about covid lungs, that they are white in x-ray that means that there is no oxygen in them (black is air, white is bad), and now I'm interested about how covid kills people. Im talking about those cases when you are in the hospital with ventilators (or whatever they are called). I tried to google it, but since english is my second language I just don't understand half of the medical terms :D [link] [comments]  |
| What was assumed to be the structure of alpha particles before and after the discovery of proton? Posted: 25 Apr 2021 09:21 PM PDT I've been reading about the history of the Atomic model and how it came to be. I came accross some interesting points that got me some questions. Between 1909 and 1911, Geiger and Marsden did experiments in which they aimed alpha particles at gold foil. The amount of deviation and deflection of these particles lead to the new model of atom where a large amount of charge and mass are in the center of the atom in a nucleus. Later on in 1917 the proton was discovered. Later on in 1930, Irene Joliot Curie and her husband, Fredric, used alpha particles to find an unknown radiation, which was neutral. James Chadwick then discovered the neutron. My question is, how is it that even before the discovery of proton, the alpha particles were being used. Also after the discovery of proton, it took some long time for neutron to be discovered. What was assumed to be the structure of an alpha particle before and after the discovery of proton? Was it assumed that alpha particles are entirely made of proton? But wouldn't that contradict the mass to charge ratio, considering that alpah particles are half proton half neutron? Actually, I am wondering if they had any idea what an Alpha particle is... [link] [comments]  |
| Are there any animals with sexually dimorphic hunting strategies? Posted: 26 Apr 2021 08:34 AM PDT I was reading about big cats and how the males in most big cat species are usually larger than the females, and was wondering if any species use that kind of dimorphic body structure in their favor when hunting. Something like one sex more suited at hunting large prey and one sex better at hunting birds or smaller/faster animals. The examples I found were social animals like lions and wolves, which makes sense to me. But, my google results stopped there. I'm wondering if anyone knows any other examples of this kind of thing? [link] [comments]  |
| Posted: 25 Apr 2021 05:48 PM PDT |
| Posted: 25 Apr 2021 01:16 PM PDT It's commonly known that testosterone aids in the building of muscles. Once a person has already built a certain amount of muscle mass, though, would keeping up the level of testosterone be required to maintain those muscles (with less effort than otherwise)? Or would a decrease in testosterone mean that one would have to exercise harder to maintain those muscles, similar to the increased effort required to build them in the first place? [link] [comments]  |
| Can someone explain transcallosal disinhibition to me? Posted: 26 Apr 2021 04:04 AM PDT In a simple way, please I just can't wrap my head around it and every paper I come across assumes I already know what it is and there's no definition anywhere online. I just want to finish this stupid essay! [link] [comments]  |
| Can executive functions be improved? Posted: 25 Apr 2021 09:14 AM PDT Hello. Apparently fluid intelligence can not be improved, yet. Can we do something about executive functions? Wikipedia article about executive functions says it can be improved at any age. I am 22. Perhaps, I can specifically do certain things since the prefrontal cortex gets myelinated between ages 20-30? Can adults above 30 do something to improve their executive function? [link] [comments]  |
| Posted: 25 Apr 2021 10:09 AM PDT I posted photos to the botany sub of three examples, unfortunately this sub doesn't allow photos so here are links :) I am a molecular engineer scientist by trade and I am curious about biosensors that respond to environmental stimuli. I would like to know exactly what is happening on the cellular level of these plants that makes them dramatically change their appearance depending if the plant is grown in high or low light, warm or cool, etc. I suspect there are some transcription factors responding to the environment and controlling the expression of pigment or chlorophyll genes, developmentally, as the plant grows new tissue. But which transcription factors? I would like to read peer reviewed papers about their response to stimuli, look at crystal structures, etc For example I found a transcription factor in Arabidopsis that receives light then translocates into the nucleus where it begins its gene expression program. I want to learn on this level of detail for my observed phenotypes. Especially interested in the variegation patterns... How are the stripes and patches formed developmentally? I assume some cycled gene expression pattern? If I can find some good primary research about this, maybe I can write up a generally accessible blog post about variegation molecular mechanisms for gardening enthusiasts :) i just dont even know where to start, since i mostly know about biology for human diseases, not plants [link] [comments]  |
| Posted: 25 Apr 2021 03:34 PM PDT While this may be mostly thinking of COVID-19 vaccinations, I am curious as to whether or not similar patterns happen with other viruses and pathogens. [link] [comments]  |
| How do steroids stop/slow Psoriasis? Posted: 25 Apr 2021 01:43 PM PDT I have psoriasis and topical steroids have worked in managing it. I am curious of how the steroids are able to stop the proliferation of skin cells. [link] [comments]  |
| What regulates the ratio of males and females in a population? Posted: 25 Apr 2021 06:52 AM PDT |
| Why are the side effects of Coronavirus vaccines so much worse than the flu shot? Posted: 25 Apr 2021 10:57 AM PDT I get my flu shot every year and generally don't experience any side effects. With Moderna I had a sore arm, tiredness, fever and chills. Is there something inherent in MRNA vaccines, or does it have something to do with Coronavirus, or is it just that all this is new and it would take a few years before they get a better grip on dosage? [link] [comments]  |
| Why can you make n-channel FETs from single layer 2D materials? Posted: 25 Apr 2021 04:42 AM PDT I'm confused, I get the basic principle of FETs, but now I've read a paper where a single layer of MoS2 is used to fabricate a FET, but there is no doping. Shouldn't there be pnp junctions? Instead there is just a single layer of MoS2 (which is probably an n type semiconductor due to sulfur vacancies). Can someone explain why this works as a FET? Does the SiO2 substrate act as a p-type semiconductor? That's the only explanation I was able to come up with. [link] [comments]  |
| Do different isotopes have different magnetic properties? Posted: 24 Apr 2021 10:04 PM PDT Such as, if I had a magnet made from let's say iron 57, would it be different than a magnet from regular iron? [link] [comments]  |
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