New PDF release: an introduction to the chemistry of plant products

By Paul Haas

ISBN-10: 1177765047

ISBN-13: 9781177765046

This is often an actual copy of a e-book released ahead of 1923. this isn't an OCR'd e-book with unusual characters, brought typographical blunders, and jumbled phrases. This publication could have occasional imperfections resembling lacking or blurred pages, bad photographs, errant marks, and so forth. that have been both a part of the unique artifact, or have been brought by way of the scanning procedure. We think this paintings is culturally vital, and regardless of the imperfections, have elected to carry it again into print as a part of our carrying on with dedication to the renovation of revealed works world wide. We enjoy your figuring out of the imperfections within the renovation method, and desire you take pleasure in this worthy ebook.

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Example text

ELECTRICAL ENERGY 41 tricity through a solution of carbon dioxide in water. Fenton * also has pointed out that the synthetic action of light and of the silent electrical discharge are practically identical. Thus there is evidence which suggests that electric energy may play a part in the earlier processes of photosynthesis ; a suggestion which is supported by the fact that, according to Polacci,f the formation of carbohydrates is promoted in leaves by electrical energy, provided it be not too intense, especially when a continuous current is made to pass directly into the tissues.

This may be averted by the conversion of the sugar into search, a marked and well-known phenomenon in many plants, which temporary reserve is translocated at nightfall after hydrolysis. But a great accumulation of starch may inhibit photosynthesis in that, presumably, it reduces the effective surface of the chloroplasts which, according to Briggs, Warburg, Wurmser and others, is the seat of the primary photochemical action. Translocation is most apparent in the dark, but it takes place also by day and it is only in sugar leaves that the undue concentration of soluble carbohydrates, owing to hindrances to rapid translocation, or to a high assimilatory efficiency, is likely to prove an important factor in carbon assimilation.

Since the ratio of xanthophyll to carotin tends to increase during photosynthesis, it is suggested that the slow recovery process in the leaf is that in which the xanthophyll is again reduced to carotin. Chemical change may be brought about by electrical energy; indeed, in connection with plants, the effect of electrical currents on vegetable growth is a not unimportant branch of applied botany. Royerf by electrical means brought about the reduction of carbon dioxide, and similarly Coehn,J in 1904, produced formic acid from this same compound.

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an introduction to the chemistry of plant products by Paul Haas

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