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Studies in Anaerobes (Paperback) Loot Price: R171
Discovery Miles 1 710
You Save: R192 (53%)
Studies in Anaerobes (Paperback): United States Congressional House, Ivan Clifford Hall

Studies in Anaerobes (Paperback)

United States Congressional House, Ivan Clifford Hall

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List price R363 Loot Price R171 Discovery Miles 1 710 You Save R192 (53%)

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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. 1921 edition. Excerpt: ...of medium. For quantitative tests it is still necessary to remove the culture fluid from the container. Our present me thods leave much to be desired in this direction; the elaborate devices invented with this end in view by Wolf and Harris 23 have already been mentioned. For purposes of following simply the titratable acidity and H+ ion curves the method used by Randall and Hall 18 is quite satisfactory. ' THE PRESENT STATUS or THE PROBLEMS OF ANAEROBIC FERMENTATION TESTS The experiments here outlined suggest the following observations: The vigorous production of gas by anaerobes is generally to be regarded as an indication of fermentation. However, two sets of facts may confuse the utilization of gas as a criterion of fermentation in special cases; first, the production of gas from simple sugars present in the medium and not removed by the method of sugar removal generally employed, i. e., by fermentation with Bact. coli, and second, the production of small quantities of gas from proteins by certain organisms, such as B. tetani, not known to have any action on sugars. The first of these difficulties may be overcome through the use of B. welchii instead of Bact. coli in the preparation of sugar-free mediums. The production of carbon dioxide by B. tetani in both sugar and sugar-free mediums also makes the utilization of carbon dioxide as a criterion of fermentation untenable. The utility of titratable acidity as a criterion of fermentation is limited to mediums not containing coagulable proteins, the hydrolysis of which by proteolytic organisms greatly increases the buffer capacity of the titrated samples. An increase in H ion concentration is regarded as the best evidence of fermentation. It has the advantage over gas of...


Imprint: Rarebooksclub.com
Country of origin: United States
Release date: 2013
First published: 2013
Authors: United States Congressional House • Ivan Clifford Hall
Dimensions: 246 x 189 x 3mm (L x W x T)
Format: Paperback - Trade
Pages: 66
ISBN-13: 978-1-234-03675-1
Categories: Books
LSN: 1-234-03675-4
Barcode: 9781234036751

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