Subject: Can someone please explain?
Posted by: Mixamatosis
Date: Jan 21 17
I've read that it's dangerous to mix ammonia and bleach. Variously I've read that it can produce deadly cyanide gas, chlorine gas (which is said to be bad for you) and even explosions.
However swimming pools are kept fit for use with chlorine, and our urine contains ammonia but then we may clean toilets with bleach. Also many cleaning products contain either ammonia or bleach and it would be easy to use them unthinkingly in combination.
How is it that people aren't generally harmed by these dangers when swimming in swimming pools or doing daily cleaning, or are we being harmed at low level and is the harm cumulative?
Posted by: Mixamatosis
Date: Jan 21 17
I've read that it's dangerous to mix ammonia and bleach. Variously I've read that it can produce deadly cyanide gas, chlorine gas (which is said to be bad for you) and even explosions.
However swimming pools are kept fit for use with chlorine, and our urine contains ammonia but then we may clean toilets with bleach. Also many cleaning products contain either ammonia or bleach and it would be easy to use them unthinkingly in combination.
How is it that people aren't generally harmed by these dangers when swimming in swimming pools or doing daily cleaning, or are we being harmed at low level and is the harm cumulative?
526 replies. On page 19 of 27 pages. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
brm50diboll 
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Your instructor probably knows a lot more about that than I do. I do think it varies depending on what area of the skin is being looked at. Reply #361. Sep 06 18, 9:47 PM |
| brm50diboll
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My own brief review of the internet suggests that yes, the time for cells from the stratum corneum to reach the surface and desquamate (flake off) is only a part of the total epidermal turnover time. As I mentioned, this time is affected significantly in psoriasis. In fact, the reduction in epidermal turnover time in psoriasis as compared to normal skin is much more dramatic than I had thought. But again, I am not a dermatologist and I am unsure about just what it is about psoriasis that causes such a dramatic decrease in epidermal turnover time and what other skin disorders may exhibit similar effects. Reply #362. Sep 06 18, 10:00 PM |
Mixamatosis
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I read somewhere, not sure where, that the whole of a person's skin changes over a 7 year period but scars still persist don't they, though they may fade. Is this true about skin Brian? Reply #363. Sep 07 18, 3:43 AM |
| brm50diboll
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Scars are not made of the same materials as original skin. When certain key layers of the skin are destroyed, regeneration to the original state becomes impossible and scar tissue is formed. This is why patients with extensive burns require skin grafts for healing to take place. Scar tissue is mostly collagen fibers and lacks the organization and stratification found in normal skin. All tissue undergoes some type of reorganization over time, even bones and nerves. In the case of scar tissue, the fibers contract, the scar shrinks a bit, and loses some pigmentation that was in the early scar from inflammatory cellular elements that were present when the scar originally formed but are later resorbed. Reply #364. Sep 07 18, 6:38 AM |
LoveAnimals555
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Yes, those scars can fade but not lost! I remember 4 years back I hurted my best friend and he got a scar after blood clotting. And that scar is present yet! I feel sorry for him as that was by mistake. Reply #365. Sep 07 18, 7:55 AM |
| Mixamatosis
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And skin does change over 7 years? (I mean by then, you would have no skins cells that had been present 7 years before). Reply #366. Sep 07 18, 2:07 PM |
| Mixamatosis
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What happens when nerves are cut? Some numbness occurs but then, over time, feeling can come back can't it? There are 2 places where I had numbness - one as a result of an operation and another as a result of injury, but now, some years later those areas feel almost normal again. Reply #367. Sep 07 18, 2:12 PM |
| brm50diboll
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Some nerve regeneration can occur, but it is limited. Feeling may come back, but still not feel "normal". More serious injuries, such as to the spinal cord, can result in permanent loss of both sensation and motor function. The issue is very complicated. Reply #368. Sep 07 18, 4:26 PM |
| Mixamatosis
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Thanks goodness the injury was only to my thumb. I just missed slicing my tendon which would have meant an operation. Another piece of luck. I just had stitches. Reply #369. Sep 08 18, 2:22 AM |
| LoveAnimals555
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Something interesting to tell about. In our college dissection of cadavers have started. It is a very odd but nice experience. I can't bear the smell of formalin and have got allergic to it. We are doing the dissection of pectoral region. Till now we have removed fat from the body and have come across deltoid muscle, pectoralis major muscle and cephalic vein. We have also seen the lobules of mammary glands as our cadaver body is female. Tomorrow we will remove Pectoralis major muscle and will come across pectoralis minor muscle, clavipectoral fascia and few more nerves, arteries and veins. I forgot to tell that we also came across Axillary vein while we put incision on Pectoralis major. Tomorrow we will remove pectoralis major completely. Please let me know if you want to know more about these muscles and veins I talked about. It will do me a good revision. Reply #370. Sep 12 18, 9:43 AM |
| brm50diboll
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They call it gross anatomy for a reason. Reply #371. Sep 12 18, 11:11 AM |
| LoveAnimals555
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Yep it is included under gross anatomy here as well. I have done a bit of dissection as well, but I am a bit allergic to formalin. BTW Brain can you tell me what compounds are present in Formalin? Is it only formaldehyde or some more compounds is present in it. Reply #372. Sep 12 18, 12:01 PM |
| brm50diboll
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Formaldehyde is actually a gas. Formalin is a solution of formaldehyde in water, along with other minor ingredients. When the gas formaldehyde dissolves in water, a water molecule attaches to the carbonyl carbon of formaldehyde, and the molecule mostly converts to methanediol. The reaction is reversible, and just as a solution of the gas ammonia in water bears a strong ammonia odor due to the gas leaking from the solution, so a formalin solution bears a strong formaldehyde odor due to the gas formaldehyde leaking from the solution. Formalin is a very strong microbicide and, due to cross-linking effects, is a powerful inhibitor of organic decomposition (rotting) processes, which is why it is used in dissections, despite its toxicity. Smelling formaldehyde in a gross anatomy lab is a rite of passage. Reply #373. Sep 12 18, 1:07 PM |
| LoveAnimals555
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I know it is a wrong place to post it here but I believe this is too the best place. Today I got my first crown...that too in piece of cake. I posted it here as I won the achievement: piece of cake in science category and all the upgrades I got were all in the science category. I had missed crown by 16.19 and 16.45 seconds earlier few days back. I am glad that I got all upgrades by playing only the science category. Huh.... I suck at all other categories except science. Since this thread is read by those interested in science, I would like you all to play in my private tournaments - The science-maniac. Here is the link - http://www.funtrivia.com/private/main.cfm?tid=104579 I hope to see few of you there. Regards Elai Reply #374. Sep 24 18, 12:06 PM |
| brm50diboll
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Congratulations on your Crown in Piece of Cake. That's better than I can do. I only have a Diamond in Piece of Cake. Reply #375. Sep 25 18, 12:27 AM |
| LoveAnimals555
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But you have all the 18 upgradeable badges of first round of upgrades while I have just 11. And more than it you have 8 crowns! Amazing! I have got all the upgrades in Piece of Cake in science-tech category. I never play any other category to it! Reply #376. Sep 25 18, 8:27 AM |
| brm50diboll
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The moons of Uranus are interesting because of their naming convention. Most planetary moons have names from mythology. But the moons of Uranus are given their names from works by Alexander Pope and William Shakespeare. Mostly Shakespeare. In fact, if it weren't for Umbriel (from Pope) getting the benefit of a bit of a "grandfather clause" in having been named before the International Union of Astronomy could fully debate this whole thing, I suspect the names of moons of Uranus may have been limited just to Shakespeare. Most of these names, curiously, are female. Now if you know this fact about the moons of Uranus and ever get a question like: Which planet does the moon Juliet orbit? You would know immediately the answer has to be Uranus. The five largest moons of Uranus include: Titania (A Midsummer Night's Dream), Oberon (A Midsummer Night's Dream), Umbriel (The Rape of the Lock - Pope), Ariel (The Tempest), and Miranda (The Tempest). Miranda is the most interesting of these. It has severely jumbled terrain. The most accepted explanation for this is that at some point in Miranda's past, it was struck by an object large enough to shatter it into many pieces. Over time, these pieces reassembled together by gravity, but in a random arrangement from how they originally were before the collision. Oh, Brave New World that has such people in it! Reply #377. Oct 12 18, 2:09 AM |
| LoveAnimals555
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So fire doesn't have a shadow? Sorry why is it so? Any ideas! Reply #378. Oct 18 18, 4:38 AM |
| LoveAnimals555
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I meant so why doesn't fire has a shadow? Reply #379. Oct 18 18, 8:40 AM |
| LoveAnimals555
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Brian are you there? Any idea why fire doesn't have a shadow?? Reply #380. Oct 19 18, 7:39 AM |
526 replies. On page 19 of 27 pages. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
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