slovo | definícia |
C5H4O2 (gcide) | Pyrone \Py`rone\, n. [G. pyron, an abbr. of pyrokoman.] (Org.
Chem.)
An unsaturated cyclic compound, C5H4O2, of which two
varieties are known, [alpha] and [gamma]. [gamma]-pyrone is
the parent substance of several natural yellow dyestuffs. |
| podobné slovo | definícia |
C5H4O2N4 (gcide) | Xanthine \Xan"thine\, n. Also Xanthin \Xan"thin\ . [Gr. xanqo`s
yellow.] (Physiol. Chem.)
A type of purine obtainable as a white microcrystalline
powder, C5H4O2N4, present in muscle tissue, in the liver,
spleen, pancreas, and other organs, and also in urine (in
small quantities) and some urinary calculi, and in the juices
of certain plants; -- so called because it leaves a yellow
residue when evaporated to dryness with nitric acid. It is
also present in guano. Xanthine is closely related to uric
acid.
[Webster 1913 Suppl.] |
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