Recent comments in /f/askscience
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Uncynical_Diogenes t1_j3rpy8u wrote
Reply to comment by bubbastars in During digestion, does ethanol react with lipids to form esters, at a significant conversion rate? by spamarind_soda
Life is the process of homeostasis, or preventing your equilibria from shifting.
You die before any of your equilibria shift very much, because that’s what dying is.
[deleted] t1_j3rpwe8 wrote
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thred_pirate_roberts t1_j3rpc34 wrote
Reply to comment by finalattack123 in Will water ice melt faster if allowed to drain, or remain in the meltwater? by terjeboe
How will you know which half melts faster?
ScienceIsSexy420 t1_j3roja5 wrote
Reply to comment by bubbastars in During digestion, does ethanol react with lipids to form esters, at a significant conversion rate? by spamarind_soda
You'd likely die from dehydration before your endogenous water levels were low enough to push thia reaction to the right enough to form appreciable amount of esters
Londonforce t1_j3rnrn2 wrote
If it drains it will melt faster. The meltwater forms a layer of cooler liquid around the ice that partially insulates it and slows melting.
I know this because I recently watched this very experiment being conducted (as part of a series of experiments that has non-intuitive outcomes). I'll try to find the link for the video.
Coffeinated t1_j3rlegu wrote
Reply to During digestion, does ethanol react with lipids to form esters, at a significant conversion rate? by spamarind_soda
If I remember correctly, the reduction in peak BAC stems from the fact that the absorption if alcohol is heavily delayed or rather slowed down, thus flattening the curve. Compare drinking a bottle of wodka on the spot to drinking beer with the same alcohol content (roundabout 5.5 liters of beer) over the course of a whole evening.
Captain_Poodr t1_j3rl36n wrote
Drain the water away and allow the ice to be in contact with air. Raising the temperature of water requires many times more input energy than raising the temperature of air. Also, air will flow over the exposed surface area of the block at a larger temperature differential than the melted water. This will encourage faster melting. When ice is melting in a glass of water, the temperature of the water itself remains close to 32F until the ice has melted. All of the energy being absorbed into the water from the environment is essentially going straight to phase changing the ice back to a liquid, but as mentioned above it requires far more energy to raise the temperature of water than air
Gogyoo t1_j3rk0dy wrote
Reply to comment by CrambleSquash in Will water ice melt faster if allowed to drain, or remain in the meltwater? by terjeboe
I thought that because water has such high specific heat capacity, it would be a good insulator. My instinct muss not be right then...
bigloser42 t1_j3rh6bq wrote
Reply to comment by Saidear in Will water ice melt faster if allowed to drain, or remain in the meltwater? by terjeboe
that is purely dependent on the container it sits in. you could easily put ice in a container where the meltwater reduces the surface area
bubbastars t1_j3rfw49 wrote
Reply to comment by varialectio in During digestion, does ethanol react with lipids to form esters, at a significant conversion rate? by spamarind_soda
Does sweating (or other forms of dehydration) affect water in the body enough to shift the equilibrium towards the products?
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[deleted] t1_j3r8i02 wrote
Reply to What exactly are ashes? by krFrillaKrilla
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bisnotyourarmy t1_j3r340k wrote
Reply to comment by CrambleSquash in Will water ice melt faster if allowed to drain, or remain in the meltwater? by terjeboe
Air is a poor conductor, but drained ice has higher surface area..... compared to the container of meltwater.
Saidear t1_j3r1kjy wrote
Reply to comment by bigloser42 in Will water ice melt faster if allowed to drain, or remain in the meltwater? by terjeboe
Meltwater is also going to have a higher surface area to absorb latent heat in the air, and is able to more effectively transfer that to the ice cube.
Archy99 t1_j3r13t9 wrote
Reply to Can autoimmune illnesses occur without autoantibodies? eg can neutrophils decide to become autoimmune? by lonelysuffering
Can neutrophils decide to be autoimmune?
No, because they don't have adaptive receptors targeted towards self antigens.
It is important not to confuse autoinflammitory with autoimmunity. Autoimmunity is based on either T-cells or B-cells (or plasma cells which are derived from B-cells) having their characteristic adaptive receptor (B cell receptor or T cell receptor) strongly bind to specific self antigens.
Note that T-cell autoimmune diseases are still hypothetical.
(More specifically, no one has characterised the T-cell receptor repertoire and demonstrated close to 100% sensitivity or specificity for a T-cell receptor subset for any disease - anyone claiming I am wrong is going to have trouble citing proof). T-cells undergo a strong selection process in the thymus to prevent autoimmunity, whereas no such process occurs for B-cells. B-cell autoimmunity doesn't necessarily need T-cell autoimmunity either.
Whereas all currently well-characterised autoimmune diseases are either B-cell diseases (associated with autoantibodies) or are in fact autoinflammatory, rather than autoimmune diseases. For example the Arthropathies do involve self-reactive T-cells but this self reactivity isn't primary driven due to self-reactive T-cell receptors, but rather they are causing inflammation regardless of what the T-cell receptor codes for.
There are parenoplastic diseases (T-cell cancers) that can rarely be autoreactive but these are extremely rare and the primary disease is the cancer.
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[deleted] t1_j3rrrux wrote
Reply to During digestion, does ethanol react with lipids to form esters, at a significant conversion rate? by spamarind_soda
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