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MICROBIOLOGY AND BACTERIOLOGY 



Ala. Factors Affecting Microbiological Transformations of Nitrogen 

 as Related to Efficient Utilization of Legumes and Fertilizer 

 Nitrogen in Southern Agriculture? To learn (1) factors influencing 

 persistence of N fixing bacteria in soil and establishment and 

 maintenance of symbiotic relations between organisms and roots of 

 host legumes; (2) influence of soil and climatic factors on rate 

 and magnitude of N transformations, with reference to mineralization 

 from organic forms, nitrification, dentrification, leaching losses, 

 and non-symbiotic fixation, 

 Agron. & Soils 574 (S-35) 



Ga. Effects of Low Temperatures- on Nitrification of Ammonia in 



Soils? (1) Learn effects of temperature in range 30°F. to 

 50°F. on nitrification of NHo in soils; (2) compare nitrification 

 characteristics of NHo and certain ammoniacal salts at low 

 temperature; (3) compare soil pH changes resulting from nitri- 

 fication of NH3 and certain ammoniacal salts at low temperatures; 

 (4) learn influence of soil type and related characteristics on 

 rate of nitrification of ammoniacal materials at low temperature. 

 Agron. 47 



Idaho A Study of the Physiology of Purine-Decomposing Anaerobes 

 Found in the Soil With Special Reference to Organisms Which 

 Decompose Adenine . To (1) isolate several strains of adenin- 

 decomposing anaerobes from various soils, waters, muds, etc., 

 using enrichment techniques; (2) describe and classify the 

 organisms, or reconcile their characteristics with Bergey f s 

 system of classification of bacteria; (3) determine growth 

 requirements of the organisms; (4) determine activity of the 

 organisms in breaking down purines other than adenine, and 

 determine quantitatively the end-products of breakdown of all 

 purines which are attacked by the organisms; (5) study feasi- 

 bility of using the organisms for quantitative analysis of 

 adenine and other purines; and (6) investigate intermediate 

 mechanisms of breakdown of adenine by the organisms. 

 Bact. 206 



Idaho Ecological Factors Influencing Free-Living Nitrogen- 

 Fixing Organisms in Certain Northern Soils . To determine (l) 

 activity of free-living N- fixing microorganisms in N. W. soils; 

 (2) nutritional requirements of these organisms; (3) influence 

 of ecological factors on activity of K- fixing organisms. 

 Bact., Agr. Chem. 214 



