Items related to Laboratory manual in elementary biology
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...grow only in sugary or saccharine fluids. There are several species of these sprouting fungi, and all are capable of exciting alcoholic fermentation. The most easily obtained species is the brewer's yeast (Saccharomyces cerevisiai). LABORATORY WORK. A. THE MORPHOLOGY OF PROTOCOCCUS. (a) Note the general appearance of Protococcus, growing on a piece of bark from a tree. Observe how it has spread over the surface of the bark (m). Compressed or dried yeast may be used instead of the brewer's yeast. (6) With your scalpel scrape off a little, mount in water, and examine it (l/). Note the general appearance of the cells. (c) Note the relation of the cells; are they solitary or con nected in clusters or colonies (one-cell, two-cell stages, etc.)? (d) Are the cells all of the same size? Sketch one of the largest (del. %'), and one of the smallest of the solitary cells to show their shape and relative size. (e) Find as many kinds of colonies or cell-stages (lp) as possible, and sketch a colony of each kind. Do you find a green coloring matter (chlorophyll) in the cells? B.--MINUTE STRUCTURE AND THE EFFECT OF REAGENTS. (a) Apply a drop of alcohol and watch the effect (//), and note the result. (//) Examine your preparation more in detail (hp) and determine whether there is a nucleus and cell-wall present. Where is the chlorophyll found? Do you find chlorophyll in the cell wall? In the nucleus? Sketch a typical cell and represent all its structures. (c) Apply a drop of iodine and note the effect (reaction) on the different structures of the cell, viz., the cellwall (cellulose); the nucleus and protoplasm. Do you find starch present? C.--MORPHOLOGY OF THE YEAST PLANT. (a) Observe some brewer's yeast. Is it a thick liquid (semi liquid), or a thin liquid? Note its color....
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 0217427545
- ISBN 13 9780217427548
- BindingPaperback
- Number of pages68
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