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Quarterly Journal of Microscopical Science (Volume 22)

Quarterly Journal of Microscopical Science (Volume 22)


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Book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1882. Excerpt: ..., MEMOIRS. Pringshbim's Researches on Chlorophyll.1 Translated and condensed by Professor Bayley Balfour, of Glasgow University. (With Plates VIII and IX.) (Continued.) V. Assimilation and Colour. The known facts regarding assimilation in plants are not in opposition to the view here advocated, that the colour only indirectly, through respiration, takes fTart in this process, and that the colouring matter has no share in decomposing carbonic acid. A. Chemical Hypotheses of Chlorophyll Function?--Out of the general notion that chlorophyll colouring matter plays a direct part in assimilation, has developed the idea that its substance enters directly into the process of decomposition of carbonic acid, and that in this process it is constantly being destroyed and regenerated. This must be the basis of any chemical hypothesis of its function in assimilation. It not only assumes the destruction in light (and in daylight of medium brightness) of colouring matter, but also that this destruction is a consequence of appropriation of the carbon drawn from the carbonic acid decomposed. The carbon-compounds formed through assimilation in the plant body, would therefore be derived from the chlorophyll colouring matter as a mother-substance. This is, however, entirely hypothetical, and has no support from the side of organic chemistry, nor from direct experiment. The assumed genetic relations of the carbon-compounds to the chlorophyll 1 'Untersuchungen iiber Lichtwirkung und Chlorophyllfunotion in der Pflanze.' Von N. Pringsheim, S. 152, mit 16 lithographirten Tafeln. Leipzig, 1881. * See Sachsse: 'Die Chemie und Physiologie der Farbstoffe, Kohlenhydrate, ' &c, Leipzig, 1877; and Wiesner, 'Die Enstebung des Chlorophylls, ' Wicn, 1877, for details regarding chemical hypotheses. VOL. XXII. NEW SER. H ...


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Product Details
  • ISBN-13: 9781154231670
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 178
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1154231674
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 327 gr


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