By Paul Haas
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Additional resources for an introduction to the chemistry of plant products
Change, whereas in inorganic photochemistry the short rays are by far the most efficient, the longer having little or no action. For this reason not a little work has been done on the action of the short rays, the ultra-violet, in bringing about the formation of organic compounds from carbon dioxide and water. All such work, interesting though it be, throws no light on the fundamental problem of carbon assimilation, since the green plant can effect the transformation in conditions which preclude the presence of ultra-violet illumination.
At a ^rvaUr rate than that at which they could he translncatnl. il, An increase in weight of approximately 0*13 gram prr ;t>u >q. cm. of leaf surface is enough to end photosynthesis When the conditions of photosynthesis are not so favourable, fur example in dull weather, the sudden retardation of the process is not observable. g. g. Ceratophyllum, in spite of the fact that the latter generally contain a larger quantity of chlorophyll per gram of dry weight. These observations, together with those of McLean alluded to on an earlier page (p.
Lubimenko* found from controlled experiments that photosynthesis is more active in the red than in the blue rays; it is only in shade plants that the process is equally intense in the two regions. Wurmser,f in his investigations on the subject, used Ulva lactuca and from his measurements found that the ratio of carbon assimilation to the amount of energy absorbed was 1-0 for red light, 4*0 for green and 2*35 for violet light, which means that the green rays although absorbed in a much lesser degree are utilized four times more than the red.
an introduction to the chemistry of plant products by Paul Haas