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

By Paul Haas

ISBN-10: 1177765047

ISBN-13: 9781177765046

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Example text

546 fifx . 436 fifji Per Cent. Efficiency. 59 53-3 44-4 33-8 It will be seen that the efficiency decreases with the decrease in t h e wave-length. Also, these values differ from those obtained by other investigators, mentioned above, using different plants and different methods, a result to be expected for t h e reasons earlier given. —This consideration of the quality of light naturally introduces the problem of chromatic adaptation. As is well known, the colour of deep water is green owing t o the greater absorption by the water of the long rays, which are strikingly absorbed and utilized b y the chloroplasts.

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.

I Kytfcn: «&» tfiS, 101, 77. PRODUCTS OF CARBON ASSIMILATION 53 contain any sucrose, whilst Tilia europcea, a starch leaf, contains much sucrose. de that sucrose is the first sugar of photosynthesis, but, on the other hand, there is evidence which may indicate that hexose, the sugar required on current theoretical grounds, is the first sugar to be formed, and various arguments have been formulated to show that the results of the work outlined above really indicate that hexose and not sucrose is the first sugar formed in the photosynthetic process.

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