. Plant physiology. Plant physiology. 46 PHYSIOLOGY OF NUTRITION nitrifying bacteria only, by preparing a nutrient solution containing no organic substances. This nutrient mediumi contained i g. of ammonium sulphate and I g. of potassium phosphate, dissolved in a liter of water. From to g. of basic magnesium carbonate was added to each 100 cc. of this solution. Nitrifying bacteria were able to develop excellently in this medium; they oxidized ammonia to nitric acid and formed an appreciable quantity of organic substance, thus assimilating the carbon dioxide of the air without the agenc
. Plant physiology. Plant physiology. 46 PHYSIOLOGY OF NUTRITION nitrifying bacteria only, by preparing a nutrient solution containing no organic substances. This nutrient mediumi contained i g. of ammonium sulphate and I g. of potassium phosphate, dissolved in a liter of water. From to g. of basic magnesium carbonate was added to each 100 cc. of this solution. Nitrifying bacteria were able to develop excellently in this medium; they oxidized ammonia to nitric acid and formed an appreciable quantity of organic substance, thus assimilating the carbon dioxide of the air without the agency of sunlight. Bacteria that need organic substances for their nutrition could not develop in such a Pig. 29.—Hydnora africana. t, part of the underground stem of the host plant; bl, one of the mature fiowers; bl', bl", flower buds of the parasite. (J^ natural size.) {After Sachs.) Without the agency of sunlight as source of energy green plants are unable to produce organic substance from the inorganic materials that serve as nutrients for these forms. As has been said, there are other inorganic substances, however (such as ammonia and hydrogen sulphide) that can serve as sources of energy for such plants as the bacteria just mentioned. These substances are common in nature, being frequently of organic origin as decomposition products of complex organic compounds, and, although they do not contain carbon ' IWinogradsky, S., Recherches sur les organismes de la nitrification. I. Ann. Inst. Pasteur 4: 213-331. 1890. Idem, same title, II. Ibid. 4: 257-27S. 1890. Idem, same title, III. Ibid. 4: 760-771, 1890). Idem, same title, IV. Ihid. 5: 52-100. 1891. [Idem, same title, V. Ibid. 5: 577-616. 1891. See No.' IV. especially.]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Palladin, Vladimir Ivano
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