摘要:

Data of twelve seasonal cruises, during 1934–1938, over the Scotian shelf have been used to determine surface currents, volume transports, and current patterns. Surface currents ranged from zero to 37.9 cm./sec. (18.2 nautical mi. da.). Volume transports varied considerably from season to season, and were greatest during winter months. Isentropic analysis of the data indicated a persistent current pattern, defining a water movement parallel to the coast, a large-scale circulatory movement over the central portion of the shelf, and a complicated vortex in the southwesterly portion of the area.

ISSN:0706-652X    

DOI:10.1139/f47-001

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

The ability of certain of the Enterobacteriaceae to produce trimethylamine from choline has been demonstrated. This provides an additional biochemical test for bacterial taxonomy.

ISSN:0706-652X    

DOI:10.1139/f47-002

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

Killifish (Fundulus diaphanus) in Tedford lake, Nova Scotia, selected bottom microcrustaceans,Hyalella, chironomids andChaoborus, but notAmnicolacommensurately with its abundance. They ignored available pelagic microcrustaceans. White perch (Morone americana) took pelagic microcrustaceans,Hyalella, odonates, chironomids,Chaoborus, insect imagines, and small fish, but avoided mollusks. With increase in length, even within narrow limits, they selected larger organisms. About 70 per cent by count and 10 per cent by dry weight of the macroscopic bottom fauna consisted of species eaten by both fish. About 20 per cent by count of the fish population was available to the perch. Other macroscopic bottom organisms and tadpoles were too large or secretive to be available. Available and acceptable bottom organisms were effectively utilized by both fish. Perch cropped the pelagic microcrustaceans poorly, but the available fish effectively.

ISSN:0706-652X    

DOI:10.1139/f47-003

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

The biological values of the crude flesh proteins of lingcod, halibut, lemon sole, and white spring salmon have been determined by growth and nitrogen retention methods using young Wistar rats as experimental animals. Additional values obtained by the growth method are reported for herring and red snapper. For comparative purposes, values were also secured on crude beef flesh proteins, egg albumin, and casein. The figures obtained for the flesh proteins from the four types of fish were of the same order of magnitude, and they were higher than those procured for the other protein foods tested. An examination of the gains in weight was carried out by the co-variance method in which the variance of the actual gains, freed from the effects of varying food consumption by regression, was subjected to analysis. This test indicated that the differences in the average weight gains between the rats fed fish flesh and those fed the other protein foods were highly significant. Data on the effect of sex on the determination of biological values are, submitted along with an explanation which helps to resolve conflicting reports on this point.

ISSN:0706-652X    

DOI:10.1139/f47-004

出版商:NRC Research Press    

年代:1947

数据来源: NRC