✦ LIBER ✦

National Advisory Committee for Aeronautics: Report No. 398. Investigation of Damping Liquids for Aircraft Instruments — II, by M. R. Houseman and G. H. Keulegan, I9 pages, illustrations, quarto. Washington, Superintendent of Documents, 1931. Price fifteen cents

Publisher: Elsevier Science
Year: 1932
Tongue: English
Weight: 124 KB
Volume: 213
Category: Article
ISSN: 0016-0032
DOI: 10.1016/s0016-0032(32)90770-4

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✦ Synopsis

IO7

their structures has been a difficult problem and only in recent years have sufficient corroborating facts been assembled to leave little doubt in the minds of most workers as to what the true structural constitution may be. Nucleic acids of higher order are accorded a separate chapter. Work on these is still in the early stages and comparatively little is known about them.

Nuclease is a term applied to enzymes which have the ability to disrupt nucleic acids. They have been divided into three classes depending upon specific action. Nucleinase breaks down the nucleic acid into nucleotides~ingle phosphoric acid, sugar, purine or pyrimidine combinations. Nucleotidase liberates phosphoric acid from the nucleotide. Nucleosidase breaks the bond between the sugar and the purine or pyrimidine base.

T. K. CLEVELAND.

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## BOOK REV1EWS. 243 American Nautical Almanac for I936, which cover all of the problems in the book, and as the methods used in printing the Almanacs are similar in each succeeding year, it can be assured that by mastering the problems for this year, there will be no difficulty in working problem