Botanical Pamplets Volume 22
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Botanical Pamplets Volume 22

Botanical Pamplets Volume 22


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About the Book

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. 1886 Excerpt: ...This view receives some support from the observations already made, that the diastase is opaque to light after it has been boiled, just as it is before. We shotild imagine such a change as the complete disruption of the molecule of the enzyme would certainly be accompanied by an increase of transparency. As this does not take place, there seems no difficulty in supposing that whatever change is brought about, it is not so extensive as to involve the disruption of the molecule. When, therefore, a leaf is illuminated by the whole of the spectrum, the order of events seems to be that the beneficial rays convert the zymogen into diastase, and the latter is speedily and continuously changed by the deleterious ones. A light seems to be efficacious for the first process which is weaker than that required for the second. The means whereby the diastase is partially or completely protected from destruction in the living plant may well receive some attention. It has been shown above that the rate of destruction is less in the living leaf than in an extract containing diastase. The proteids of the leaf have no doubt a considerable power of screening off the deleterious rays and presumably this power is shared by the protoplasm of the cells. The chlorophyll may also be presumed to have a protective effect, though how far this extends may be disputed. The spectrum of chlorophyll is probably without the ultra-violet rays, though no investigation of this point can at present be made. Still, as the amount of chlorophyll in an alcoholic solution is increased, it cuts off more and more of the violet end of the visible spectrum. Even when very little is present, it blocks out the rays beyond 430 //, which we have seen to be deleterious. It is true that chlorophyll allows most ...


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Product Details
  • ISBN-13: 9781130804065
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 110
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130804062
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 213 gr


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