Experiments with Two Methods for the Study of Vitamin B (Classic Reprint)

Experiments with Two Methods for the Study of Vitamin B (Classic Reprint)

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Excerpt from Experiments With Two Methods for the Study of Vitamin B Over 300 quantitative determinations by the gravimetric yeast growth method and over 150 quantitative studies of the growth of young rats have been completed. The data secured with both methods have been such as to permit of the discussion and interpretation of the results upon a quantitative basis. The gravimetric yeast-growth method of Williams seems the most promising of the quick methods permitting easy control of conditionsthroughout an experiment and relatively rapid and numerous repetitions by means of which to reduce the probable error of the mean result. The data obtained make it clear that this method as here described is capable of yielding consistent results, the coefficient of variability and probable error of which can be kept within limits quite satisfactory for the purposes of vitamin research as at present developed. The Williams method is, however, open to the Objection that the increased growth of yeast which it measures may be due to the introduction of other substances favorable to yeast growth as well as the vitamin B. The medium devised by Fulmer, Nelson, and Sherwood to overcome this Objection is not adapted to gravimetric use especially because of its employment of insoluble buffers. The counting of cells yields results too variable for satisfactory quantitative discussion. The rat-growth method involves somewhat larger probable errors than the Williams yeast method, but can be interpreted in terms of the B vitamin with much greater certainty and is therefore the preferable method. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.show more

Product details

  • Paperback | 26 pages
  • 152 x 229 x 1mm | 50g
  • Forgotten Books
  • United States
  • English
  • , black & white illustrations
  • 0243084455
  • 9780243084456