Why don't a blood donor's antibodies cause problems for the reciever? |
- Why don't a blood donor's antibodies cause problems for the reciever?
- Where is the antigen presented with adeonviral vaccines?
- What's the most infectious disease in human history?
- Does a human brain have a limit for capacity of memories?
- In biology how do ligands find their receptors physically? Do they just float around randomly and if they hit the receptor at the right angle they bind?
- How are Covid PCR tests being run?
- Why is HDD/SSD always less than the advertised amount?
- Does the amount of energy to freeze water scale linearly?
- Could we make graphene by simply melting pure carbon into a liquid and then confining it to a space that is only one atom thick?
- Is a stars heliosphere or termination shock proportional to its luminosity?
- How does temperature affect London Dispersion Forces?
- How do ticks get engorged if they have an exoskeleton?
- How do we know that physical formulas and constants are correct?
- If babies knew words could they talk?
- How do surgeons join muscles?
- Does the Celsius scale change if sea levels rise?
- Bringing stuff (like metals) from other planets, or asteroids will affect the earth rotation?
- Why do metal pans heat up so much quicker than glass pans?
- If planet 9 exists and is a super earth as some believe, is its orbit in our solar system atypical?
| Why don't a blood donor's antibodies cause problems for the reciever? Posted: 06 Nov 2020 03:11 AM PST Blood typing is always done to make sure the reciever's body doesn't reject the blood because it has antibodies against it. But what about the donor? Why is it okay for an A-type, who has anti B antibodies to donate their blood to an AB-type? Or an O who has antibodies for everyone, how are they a universal donor? [link] [comments]  |
| Where is the antigen presented with adeonviral vaccines? Posted: 06 Nov 2020 04:12 AM PST I understand that the virus carries the gene of the specific antigen (e.g. SARS-CoV-2 S protein). But upon entering the body where is this expressed? If the viral vector infects a cell, and expresses it in the host, would not this trigger an immune response against the antigen AND the host cell as well? What host cells do these viral vectors infect, anyhow? Or are they presented on the virion surface only? Thank you. [link] [comments]  |
| What's the most infectious disease in human history? Posted: 05 Nov 2020 11:41 AM PST I was playing Plague Inc the other day and it said the Common Cold was the most infectious disease. But I always thought the Flu was the most infectious. Is it neither? [link] [comments]  |
| Does a human brain have a limit for capacity of memories? Posted: 06 Nov 2020 03:23 AM PST Thought of this because of a photographic memory, since they don't forget anything what happens if their brain "fills up"? [link] [comments]  |
| Posted: 05 Nov 2020 10:36 PM PST For example, with antibodies, do they just float around the blood at a certain concentration and when they collide with the epitope of their corresponding antigen, they attach? I know its like a lock and key analogy, but textbooks just show a 2d image with an antibody falling ontop of an antigen. In actuality, is there anything attracting the two or is it just billions of antigens and billions of antibodies in an aqueous environment and just statistically likely to occur? [link] [comments]  |
| How are Covid PCR tests being run? Posted: 05 Nov 2020 08:38 PM PST I've been seeing lots of conspiracy theories that Covid PCR tests are using 45 cycles for positive result. I assume whats happening is that the thermocycler is set for 45 cycles and a positive result would be a peak prior to like ~31 cycles. Is this the case? Surely they aren't just checking after 45 cycles and taking any product as positive, you'd have like a 100% positive rate. [link] [comments]  |
| Why is HDD/SSD always less than the advertised amount? Posted: 05 Nov 2020 06:56 PM PST |
| Does the amount of energy to freeze water scale linearly? Posted: 05 Nov 2020 11:50 AM PST If I was to freeze 1 ml of water does that take 1/1000th the amount of energy as freezing 1L of water? If not, how does it scale? [link] [comments]  |
| Posted: 05 Nov 2020 04:01 PM PST I am thinking of something like melting carbon under high pressure (~100 atm) and turning it into a moldable liquid. Then using something like 2 metal plates with higher melting points than carbon on opposite sides coated with a non-stick material, we can bring these two plates closer and closer via hydraulics or other technology, thinning out the currently liquid carbon and increasing its surface area until it is only one atom thick. From there we can let the carbon cool off naturally or by use of coolant on one or both of the metal plates to speed up the process. One of the challenges I assumed we would face while putting this procedure into use was: How could we even bring metal plates that close with such accuracy that they only leave room for one carbon-atom? But looking at the conditions needed for the Casimir effect I think we do have the technology to do that. [link] [comments]  |
| Is a stars heliosphere or termination shock proportional to its luminosity? Posted: 05 Nov 2020 09:48 AM PST According to Wikipedia, the suns Heliosphere (outside of which is interstellar space) lies at around 100 Astronomical Units. However, I couldn't find any info about other stars. Would a star with let's say a quarter the luminosity have a Heliosphere radius of 50 AU? 25? Are there any equations relating them? [link] [comments]  |
| How does temperature affect London Dispersion Forces? Posted: 05 Nov 2020 10:54 AM PST I don't how to word it, Im basically asking why do the London dispersion forces occur between two non-polar molecules to form a super cold liquid like liquid nitrogen? [link] [comments]  |
| How do ticks get engorged if they have an exoskeleton? Posted: 05 Nov 2020 09:42 AM PST Supposedly, the rigidity of an arthropod exoskeleton inhibits bodily growth which is why many insects must shed their shells by molting to grow. So how are ticks able to get so large? [link] [comments]  |
| How do we know that physical formulas and constants are correct? Posted: 05 Nov 2020 07:18 AM PST The title explains it. And how do we know that the gotten answer in an equation is correct, if we have come up with the equation? [link] [comments]  |
| If babies knew words could they talk? Posted: 05 Nov 2020 05:46 PM PST Is a child's inability to speak only due to the fact that they don't know words or is there some physical development that needs to take place before they have the ability to talk [link] [comments]  |
| Posted: 05 Nov 2020 08:38 AM PST When medics transplant something that is directly attached to muscles, how do they connect the muscles? Like with wires?? (uhm maybe vocal cords as an example) [link] [comments]  |
| Does the Celsius scale change if sea levels rise? Posted: 05 Nov 2020 03:52 AM PST If the scale is defined as boiling point at 100° and freezing point at 0°, at sea level, then does a sea level rise cause the scale to be compressed? Or, does the scale remain physically constant, and the height at which water boils increases at the same rate as sea levels? [link] [comments]  |
| Bringing stuff (like metals) from other planets, or asteroids will affect the earth rotation? Posted: 05 Nov 2020 05:09 AM PST I know that the earth rotate around the sun at the right distance thx for its mass i guess. I read about how humans can gather more resources from other planets or asteroids. But if humans start to bring heavy metals to earth, the mass of the earth will increase and probably this would affect how the earth rotate around the sum making the earth or stopping from rotate but going towards the sun or maybe go away from the sun. is that right? [link] [comments]  |
| Why do metal pans heat up so much quicker than glass pans? Posted: 05 Nov 2020 05:18 AM PST This is probably a stupid question, I'm just curious from a chemistry standpoint. But, I'm just interested because I'm making brownies and I noticed they are way chewier when I use a metal pan. Can someone explain this? [link] [comments]  |
| If planet 9 exists and is a super earth as some believe, is its orbit in our solar system atypical? Posted: 05 Nov 2020 04:37 AM PST |
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