A Text-book Of Plant Physiology; By George James Peirce

Paperback | January 10, 2012

byGeorge James Peirce

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1903. Not illustrated. Excerpt: ... CHAPTER III NUTRITION From the preceding chapter we have learned that respiration is a destructive process consisting either in the breaking up of complex compounds into simpler ones, or in the physiological oxidation of various combustible substances. With the important exception of the nitrogen, sulphur, and iron bacteria, which derive their energy from simple compounds, all living organisms depend for their chief supply of energy upon complex compounds existing in nature only as the result of the constructive activities of living organisms. In the last chapter we assumed the presence of these complex compounds, examining only the means of deriving energy from them. Energy is needed for construction, to do work. Only so much energy can be liberated by complete combustion or complete decomposition as was employed in construction. Theoretically just as much energy should be liberated in the combustion of a starch grain as was needed to make it, but the cell is not a perfect machine; not all the energy or power used goes into the finished product, some is expended in overcoming the internal resistance of the machine, some is radiated, or "lost" in other ways. There is waste of energy and of material in every machine, the product does not represent the total expenditure of material and energy. As it costs a certain amount of energy to keep an engine going without its doing-any other work, and a larger amount to make it do work as well as go, so it costs a certain amount of energy to keep an organism alive and more to make it do anything. The sum of the energy expended in making the engine go. plus the amount expended in making it do work, equals the amount of energy which must be developed to run it, if there is no loss by radiation, etc. So also the sum of the en...

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1903. Not illustrated. Excerpt: ... CHAPTER III NUTRITION From the preceding chapter we have learned that respiration is a destructive process consisting either in the b...

Format:PaperbackDimensions:104 pages, 9.69 × 7.44 × 0.22 inPublished:January 10, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217430074

ISBN - 13:9780217430074

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