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COLLECTION AND EXAMINATION OF SAMPLES
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abundance of bacteria Achromobacter acids aerobes agar algae ammonia anaerobic animals aquatic attached autotrophic average Bacillus bacteria found bacteria per ml bacteria were found bacterial activity bacterial population Bacterium bottles bottom deposits CaCO3 carbon cells cellulose cent chitin colonies concentration copepods cultures decomposed decomposition decrease depth described diatoms digesters dilution distance from land distribution of bacteria effect euphotic zone factors Fischer fish fresh water fresh-water fungi glass gram growth hydrocarbons hydrogen influence isolated Issatchenko Lake Mendota lakes large numbers lignin marine bacteria marine mud meters Micrococcus microorganisms molds nitrate nitrifying nitrogen numbers of bacteria nutrient observed occur organic content organic matter overlying water oxidation oxygen parasitic particles phosphate phytoplankton plankton plants plate counts precipitation pressure production Pseudomonas quantities salinity salt sea water soil solid surfaces sulfate reducers sulfate-reducing bacteria sulfur bacteria surface water Table temperature teria tion tube Vibrio Waksman yeasts zone zooplankton