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Download book The Science of Hygiene; A Text-Book of Laboratory Practice for Public Health Students

نویسنده :Christina Loboda
تاریخ:یکشنبه 28 تیر 1394-04:20 ب.ظ

The Science of Hygiene; A Text-Book of Laboratory Practice for Public Health Students by Walter C C Pakes

The Science of Hygiene; A Text-Book of Laboratory Practice for Public Health Students
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Author: Walter C C Pakes
Number of Pages: 70 pages
Published Date: 15 Jan 2013
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781234199135
File size: 21 Mb
File Name: The.Science.of.Hygiene;.A.Text-Book.of.Laboratory.Practice.for.Public.Health.Students.pdf
Download Link: The Science of Hygiene; A Text-Book of Laboratory Practice for Public Health Students
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...of starch and water. 6. If the water runs out round the coverslip remove the excess with a little filter-paper. The preparation is now ready to be examined. B. In Dilute Iodine Solution This method is a very useful one, as the concentric rings can very often be seen with great distinctness, even in specimens which only show them faintly when mounted in water. The process of mounting is identical with that above described, a weak solution of iodine being used instead of water. The solution of iodine recommended is Gram s iodine.... 1 part. Water..... 3 or 4 parts. These specimens prepared in either of the above ways will only last as long as the water remains. In the warm laboratory they very soon dry. For this reason, they should be examined as soon as prepared, and if sketches are to be made, they should be made at once. C. In Farrant s Solution Proceed as in A, omitting, however, to breathe on the coverslip. Mounted in this way, starches will keep for two or three weeks. The starch granules possess certain characteristic appearances either in their size, shape, concentric rings or hila. These appearances enable us to divide them into five groups. It is not always easy to differentiate from one another starches in the same group; but not diflicult to determine into which group a starch should be placed. GROUP I Wheat, Barley, Rye The granules in this group are circular or oval in appearance, some being large and others small. They have no very apparent hilum and no concentric rings. I. Wheat (Triticum vulgare). 2. Barley (fiordeum vulgare). 3. Rye (Semle cereale). 0 FIG. 2 FIG. 3 FIG. 4 WHEAT STARCH BARLEY STARCH RYE STARCH X 200 X 200 X 200 1. The wheat granules are generally very perfect. They are chiefly of two sizes, ..."

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