Download e-book for kindle: an introduction to the chemistry of plant products by Paul Haas

By Paul Haas

ISBN-10: 1177765047

ISBN-13: 9781177765046

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Sample text

The difference in the two leaves lies in their having different coefficients of acceleration of their assirnilatory activity with, increased temperature. Of the use made by the plant of specific parts of the spectrum, it has been generally accepted that those wave-lengths associated with the prominent bands in the red of the absorption spectrum of chlorophyll were the only ones concerned with carbon assimilation. It is. however, to be remembered t h a t the light absorbed by such a structure as a leaf is not necessarily all employed in t h e photosynthetic process, that rays of different wave-lengths are not equally absorbed and that different wave-lengths have different energy values.

Bauer and Rebmann ; " Helv. Chim. Acta,/' 1922, 5, 828. , 1923, •6» 959- Porter and Ramsperger : " J. Amer. Chem. Soc," 1925,47, 79. 1 views an-I > u ^ - . 'M vi the j ' h; > t. > > v n t n v - •. •'. • d i. a r b <« 11 y d r a t e. "1 hev t';:vi vj-n^vcr, that if carbon dmxide be. ysis ; the exact nature of this subst,-tTire has yet to be di'terminvd, but it possibly contains carbohydrate. filament lamp or a ioo-watt half-watt lamp, in place of ultra-violet radiation; using coloured absorbing surfaces such as the basic carbonates of nickel or cobalt, these authors were able to obtain a larger yield of organic material than with the colourless substances and ultra-violet light mentioned above.

Wiss. /' 1&S5, 16, 1. I Biirgersteia: " Ber. dent. "bot. ," 1900, iS, 168. § See Vol. , p. 311. ijMoatevercle aad Lubimeako: "Bull. Jard. Iinp. Bot. St. Petersbewarg/' 1909, J>» 27; " Ball. Acad. Sci. St. "Petersbourg," 191-2t609. f See Palladia: **Ber. deut. bat. Cka," 1891, ip» 229. Mansky: "Itiodteoi. " 1922,132, x8. **Se®Ewart; "Ajia. Bot,/* 1S97, u r 459; 1S9S, 1:2, 379. Pantaaoili: "J&kr. wisa. Bat," 1903, 3^, 167. Urspraiig: *f Ber. d«nt. bot, & " M* 57- INFLUENCE OF ILLUMINATION 31 be lost by reflection, absorption or transmission.

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an introduction to the chemistry of plant products by Paul Haas


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