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Transactions and Proceedings of the Botanical Society of Edinburgh Volume 17

Transactions and Proceedings of the Botanical Society of Edinburgh Volume 17


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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. 1889 Excerpt: ...mainly through the observations of Schimper and Meyer, been very distinctly followed. The chloroplasts arise from colourless plastids, which have been traced in all young meristem, and even in the embryo-sac of various plants; they divide directly, and, at maturity, a yellow colouring matter, etiolin, appears as the result of the reduction of part of the protoplasm of the corpuscle. It is this etiolin which on exposure to light may become green. It is interesting to notice, that a starch-grain in the cor TBAN8. BOT. 80C VOL. XVII. T puscle, obtained by it by the reduction of proteids in the cell, disappears as the etiolin is formed, being in part used in building up the protoplasm of the corpuscle, which protoplasm in turn goes to the production of the colour-substance As to stages subsequent to the production of the chlorophyll, Schimper and Baccarini have recorded that, from the round chloroplast may be formed a body of crystalline character, and of red or yellow colour, invested by a layer of protoplasm. Evident conditions of degradation are commonly seen in fading leaves, where the chlorophyll-corpuscles either undergo disintegration, the whole leaf becoming brown, or collect together into amorphous masses; these, although at times differently coloured, are most commonly rendered yellow by the presence of xanthophyll. This xanthophyll is the substance into which the chlorophyll has chiefly altered. Messrs Martin and Thomas have recorded several interesting observations as to the condition of the cells in leaves which, as in autumn, are undergoing colour-change. When red, the denser cell-contents have mainly disappeared, the colour being free in the cell-sap; when yellow, the colour is chiefly in the amorphous masses, the change evidently not having proc...


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Product Details
  • ISBN-13: 9781130609288
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 192
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1130609286
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 354 gr


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