The effect of oxygen tension on the rate of oxidation of organic matter in sea water by bacteria

It is generally recognized that the oxygen consuming capacity of heterotrophic bacteria in water serves as a good criterion of the amount of respirable or oxidizable organic matter in the water. However, the fragmentary literature on the subject records contradictory observations on the effect of oxygen tension upon the rate of bacterial oxidations. For example, Pomeroy (1938) found the amount of oxygen consumed by diluted sewage containing from 0. 7 to 17 .5 cc. of oxygen per liter to be independent of the oxygen tension but Heukelekian (1936) noted the maximum consumption of oxygen in such sewage mixtures containing around 10.5 cc. of oxygen per liter...

Apparatus for collecting water samples from different depths for bacteriological analysis

Prerequisite to quantitative studies on the occurrence and importance of bacteria in the sea or other natural waters is a satisfactory device for collecting water samples for bacteriological analysis from any desired depth. Such a device must be easily sterilized, susceptible to aseptic manipulation under the most rigorous field conditions, possible to operate at high hydrostatic pressures and it must be made of biologically inert materials...

Studies on marine bacteria. I. The cultural requirements of heterotrophic aerobes

The observations of Issatchenko (1914), Benecke (1933), Waksman (1934), ZoBell (1938) and others have established that bacteria are quite widely distributed in the sea where they probably play an important role influencing chemical, physico-chemical, geological and biological processes. However, due primarily to the widely divergent analytical procedures which have been used by various investigators studying the distribution and activities of marine bacteria, the quantitative results obtained by different workers in different parts of the world are not comparable

Bacteria as food for certain marine inverebrates

Because of their ability to convert dissolved organic matter into cell substances and to synthesize protoplasm below the depths to which radiant energy penetrates sea water, bacteria may play an important role in the nutrition of marine animals. It has been well established experimentally that bacteria serve as an important source of food supply for protozoa (Luck et al, 1931) but it is not definitely known to what extent they may play a role in the nutrition of higher forms of animal life...

Studies on the chemical preservation of water samples

During the storage of water samples collected from the sea, rivers or lakes, increased bacterial activity causes changes in the organic, oxygen, carbon dioxide, ammonia, nitrate or phosphate content or the H-ion concentration of the water (Waksman and Carey, 1935 ; ZoBell and Anderson, 1936)...

The growth and viability of sixty-three species of marine bacteria as influenced by hydrostatic pressure

The hydrostatic pressure of sea water, which increases approximately 0.1 atmosphere per meter of depth, was found to affect the viability, reproduction, and morphology of 63 stock cultures of marine bacteria representing several genera. Many of the cultures were killed at 27° C by pressures ranging from 200 to 600 atm, although some few reproduced at 600 atm. Initial inoculum concentrations of the various bacteria appeared to influence their ability to reproduce or to tolerate high pressures. Pressures exceeding 400 atm inhibited the fission of certain bacteria without stopping their growth, thereby resulting in bizarre cells, some of which formed Jong filaments

Sulfate-reducing bacteria in marine sediments

The occurrence of hydrogen sulfide in the waters of certain seas, fjords, and basins, as well as the presence of black or blue stinking sediments, can hardly escape the notice of any marine scientist. It is not surprising, therefore, that the eminent oceanographer Murray (Murray and Irvine, 1895) concerned himself with the nature of these materials and postulated their bacterial origin even before bacteriologists had described the specific organisms involved

Studies on the isolation of bacteria-free cultures of marine phytoplankton

Physiological studies on phytoplankton such as nitrogen assimilation requires the use of pure cultures. It is a matter of relative ease to separate the various forms and cultivate them under artificial conditions but difficulty is frequently encountered in freeing the phytoplankton of contaminating bacteria

SOME FACTORS WHICH INFLUENCE OXYGEN CONSUMPTION BY BACTERIA IN LAKE WATER

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