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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. 1920 edition. Excerpt: ...later on proved by Greissmayer3, thus corroborating the work of Pasteur. Besides, in seeking an artificial nutrient solution for yeast, Pasteurfound ammonium tartrate to be the best material for the purpose. It is with a view to determine the influence of both ammonium tartrate and ammonium citrate that the writer has used these salts to find out their respective influence on the organism. From the curves in Fig. 8 it is evident that the combination in series 6a allowed a growth of 50 millions, while the addition of-01 M ammonium tartrate raises the growth to 110 millions. Even the addition of-025 M ammonium tartrate approaches the same. Similarly the growth obtained by ammonium citrate at the same concentration stimulated the growth to 104 millions. In order to compare the results of the above experiments on yeast only one case may be cited below: Brenner95 found that ammonium tartrate is one of the most suitable forms for nitrogen assimilation in Aspergillus niger, comparable to the effect of asparagin. He also found that the same organism assimilates ammonium citrate better than ammonium sulphate. It may be added here that an experiment performed with ammonium tartrate combination with the salts of series 7 produced a similar result both in fermentation and multiplication of yeast cells. The growth of yeast obtained with ammonium tartrate has been found to be the best in all the mixtures of organic and inorganic salts hitherto tested. This mixture allowed a growth which is comparable to a certain extent with the multiplication of Pasteur, L. Annal cl Chim et d Physique, 1862, 3 ser., Lxiv, 1. yeast cells obtained by dilute grape juice or malt-wort. But it is to be noted that the growth obtained either with grape juice or malt-wort, as...
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