摘要:

Inhibition of the growth of bacteria by sodium nitrite is largely dependent on the pH of the substrate upon which they are cultivated. Thus at pH 6.0, 0.02 per cent of sodium nitrite may entirely inhibit or strongly retard growth, while at pH 7.0 little or no inhibition is in evidence. There is a marked variation in the susceptibility of different bacteria to nitrite, and there appears to be no definite relationship between its effect in retarding growth and in inhibiting aerobic respiration.

ISSN:0706-652X    

DOI:10.1139/f40-030

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

A morphological and physiological study of the brown halophilic moldSporendonema epizoum(Corda), commonly calledTorula epizoa, has been made. The organism is truly halophilic, optimum 10 to 15% salt. Optimum relative humidity, 75%. Growth over wide pH range. The fungistatic properties of various preservatives, particularly the fatty acids and some of their salts, were investigated. Sodium propionate was found effective and suitable for commercial control of the organism.

ISSN:0706-652X    

DOI:10.1139/f40-031

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

Twenty-six cultures of brown halophilic molds from undried and dried salt fish, air and salt were compared for halophilism, temperature and pH limits for growth and ability to utilize gelatin and sugars. Nineteen cultures, including all salt fish isolations, areSporendonema epizoum(Corda) Ciferri et Redaelli. They are true halophiles, show no growth at 37 °C., no gelatin liquefaction; spores medium to dark brown, large. Other strains, resemblingTorula minutaHøye, are facultatively halophilic, grow at 37 °C., liquefy gelatin; spores light brown, small.

ISSN:0706-652X    

DOI:10.1139/f40-032

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

Among the fish and insects which constitute the principal foods of the larger predaceous fish of Cultus lake, B.C., young sockeye salmon (Oncorhynchus nerka) are of outstanding importance. In general, the consumption of sockeye is proportional to their abundance, though it may be in some cases modified in the direction of less than proportional predation upon the smaller populations. Consumption of alternative foods increases greatly in years when sockeye are scarce.

ISSN:0706-652X    

DOI:10.1139/f40-033

出版商:NRC Research Press    

年代:1941

数据来源: NRC