摘要:

The survival time of red halophiles in solutions of sodium chloride is greatest in saturated solutions and decreases with reductions in the concentration of salt. At 25 °C. heavy inoculations may survive for months in saturated brines, rarely over 24 hours in 10 per cent solutions, and for 2 to 6 hours in tap water free from salt. Increased temperature and decreased pH reduced the survival time in all of the salt concentrations tested. Various protein materials, but not sugar, had a protective action against the destructive action of decreased salt concentrations.

ISSN:0706-652X    

DOI:10.1139/f52-019

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Codfish muscle will imbibe water as long as the average concentration of the brine within the tissue does not exceed approximately 10 per cent. Beyond this concentration it loses water.

ISSN:0706-652X    

DOI:10.1139/f52-020

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

From the dark muscle of British Columbia herring a highly active enzyme capable of peroxidizing non-conjugated unsaturated fatty acids was isolated. This "lipoxidase", which was shown to be a nitrogenous complex possessing no heavy metals or sulphydryl group as the active centre, is heat-labile and can act only in presence of activators such as certain iron-containing organic nitrogenous compounds. Two such compounds, namely haemoglobin and cytochrome "c" were isolated. The enzyme exhibits optimal activity at 15 °C. and pH 6.9. There is also an optimal concentration of enzyme, substrate, and of the activators for maximal enzyme activity. The presence of the activators appears to change the kinetics, of the reactions. The inhibition of the enzymic reaction brought about by cyanide and azide is possibly due to the inactivation of the iron-containing activators rather than of the enzyme itself.

ISSN:0706-652X    

DOI:10.1139/f52-021

出版商:NRC Research Press    

年代:1952

数据来源: NRC