. Deep-ocean biodeterioration of materials. Materials; Marine sediments. fj//<////|/j</tj^jMiHii|i|ii!M|i|iiMiiiiipiiJM4^ Figure 5. Rock sample from 6,000-foot depth showing numerous holes made by rock-boring animals. Bryozoa (erect type), tube worms, and legs of a brittle star are visible. The samplers have been described in Reference 1. The results of the bacterio- logical analysis of the sediment samples are presented in Tables III, IV, and V, The sulfate reducers found in the sediment samples are anaerobic bacteria which obtain their energy by the reduction of sulfate and sulfite in
. Deep-ocean biodeterioration of materials. Materials; Marine sediments. fj//<////|/j</tj^jMiHii|i|ii!M|i|iiMiiiiipiiJM4^ Figure 5. Rock sample from 6,000-foot depth showing numerous holes made by rock-boring animals. Bryozoa (erect type), tube worms, and legs of a brittle star are visible. The samplers have been described in Reference 1. The results of the bacterio- logical analysis of the sediment samples are presented in Tables III, IV, and V, The sulfate reducers found in the sediment samples are anaerobic bacteria which obtain their energy by the reduction of sulfate and sulfite in water in the absence of free oxygen. The end product of their metabolic process is hydrogen sulfide (H2S). These microbes are considered to be responsible for the anaerobic corrosion of metals.° Microorganisms other than sulfate reducers, are also found to be responsible for metal corrosion.'/°/' The number of aerobic, anaerobic, and sulfate-reducing marine bacteria was determined in the laboratory on nutrient agar plates and in test tubes. Because of the different nutritional requirements of marine bacteria and the limitation in the enumeration procedure employed in this study, only a small percentage of the bacte- rial population may have been demonstrated by the analysis of the bottom samples. The following media were used for culturing marine 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 Muraoka, James S; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Calif. : U. S. Naval Civil Engineering Laboratory
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