Search found 6 matches

by TimD
Wed Nov 17, 2010 7:20 pm UTC
Forum: Science
Topic: Artificial Sapphire Build
Replies: 40
Views: 22705

Re: Artificial Sapphire Build

NaOH is easy to get, you can buy it solid, usually sold as caustic soda (at least in England) and sold with drain cleaners and the like (worrying that you can get strong acid and strong base drain cleaners in the same place, mixing them eg trying a second if the first doesn't work can have horrible ...
by TimD
Mon Nov 15, 2010 9:19 pm UTC
Forum: Science
Topic: Amino Acid Chirality
Replies: 19
Views: 2039

Re: Amino Acid Chirality

There is a paper somewhere on the arxiv, where the authors lay out a possible mechanism - All neutrinos in nature are left-handed. Now assume there is some (very weak) coupling between the orientation of nuclear spin of N14 and what stereoisomer it is part of. Its possible for a neutrino to interac...
by TimD
Mon Nov 15, 2010 8:05 pm UTC
Forum: Science
Topic: Amino Acid Chirality
Replies: 19
Views: 2039

Re: Amino Acid Chirality

Well, there is the trivial answer - amino acids are L because their metabolic pathways produce L. But the real question I think is why are they L instead of D? Why do the enzymes produce and act on L amino acids (and D sugars) instead of the other way around? Another interesting question is why we ...
by TimD
Mon Nov 15, 2010 4:02 pm UTC
Forum: Science
Topic: Amino Acid Chirality
Replies: 19
Views: 2039

Re: Amino Acid Chirality

Stems from a homework question, but I got interested in exactly how the chirality is preserved. I know it's an enzyme, hence my suggestion that it is the aminoacyl tRNA synthase enzymes that do it, as they're the ones that bind the amino acid to the tRNA (ie only bind Val, and not Leu), hence they'r...
by TimD
Sun Nov 14, 2010 2:22 pm UTC
Forum: Science
Topic: ROV construction
Replies: 15
Views: 2499

Re: ROV construction

Definitely go with an umbilical, at least until you get it working perfectly. I would make the umbilical using a cat5 (or two) and a tough rope, securely connected to the rear of the unit. That way, it should come given enough of a tug, or at lest easily recoverable with a snorkeling kit (swim down ...
by TimD
Sat Nov 13, 2010 4:48 pm UTC
Forum: Science
Topic: Amino Acid Chirality
Replies: 19
Views: 2039

Amino Acid Chirality

So, in the vast majority of polypeptides, we find only L amino acids. Why? A good wikipedia session, and a good deal of reading from MBoC sheds little light on the subject. So far I know that all D form amino acids that are used (eg peptidoglycan) are so formed by post-translational modification of ...

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