. Bacteria in relation to country life. Bacteria. 294 Bacteria in Relation to Country Life produced slowly or rapidly, the sulfuretted hydrogen, a gaseous substance, is not in itself available to higher plants as a source of sulfur. It must be changed further into sulfate, usually sulfate of lime (gypsum), before it can be used to advantage. The sulfuretted hydrogen evolved in the decay of animal and vegetable materials may be changed to sulfate by purely chemical means, or by a group of organisms desig- nated as sulfur bacteria. The sul- fur bacteria are found in ditches, canals, swamps, seas
. Bacteria in relation to country life. Bacteria. 294 Bacteria in Relation to Country Life produced slowly or rapidly, the sulfuretted hydrogen, a gaseous substance, is not in itself available to higher plants as a source of sulfur. It must be changed further into sulfate, usually sulfate of lime (gypsum), before it can be used to advantage. The sulfuretted hydrogen evolved in the decay of animal and vegetable materials may be changed to sulfate by purely chemical means, or by a group of organisms desig- nated as sulfur bacteria. The sul- fur bacteria are found in ditches, canals, swamps, seas, and mineral springs,—in places where there is a more or less constant supply of sulfuretted hydrogen. These or- ganisms possess, in a very marked degree, the power of decomposing the sulfuretted hydrogen and of depositing granules of sulfur in their cells. When grown in solu- tions containing sulfuretted hy- drogen, the cells are seen to be filled with sulfur granules. The latter make up, at times, 80 to 95 per cent of the fresh weight of the bacteria. When the supply of sulfuretted hydrogen is dimin- ished or exhausted, the sulfur granules gradually disap- pear and the bacteria perish. Evidently, the organisms are dependent on the sulfuretted hydrogen for their energy. They secure the latter by causing the hydrogen. Fig. 84. Sulfur bacteria.— 1. ThiospirUium Wino- gradskii; X 2,000. (Omelianski.) 2. Beg- giaioa alba; X 2,440. (Coisini.). 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 Lipman, Jacob Goodale, 1874-1939. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1911
