摘要:

Temperature variations in the surface sea water at St. Andrews, N.B., indicative of variations in surface water temperatures over the main portion of the Atlantic coast of North America, have been expressed mathematically, and cycles of 3.3, 9 and 15 years are involved. It is suggested that cyclic variations in tidal forces and sun spot activity are associated with the variations in the surface water temperatures.

ISSN:0706-652X    

DOI:10.1139/f47-027

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

At Bermuda, the polychaete worm,Odontosyllis enopla, approaches the surface and luminesces in connection with spawning monthly after full moon, beginning about 55 minutes after sunset and lasting half an hour. In mid-winter this display was correlated with no moon at that time after sunset irrespective of clouds which did not seem to affect visibility. Response only to decrease in light intensity from sunlight to starlight gives lunar periodicity. There is similar behaviour in other species ofOdontosyllisand also inPlatynereisandNereis. Apart from spawning, the prawnsAnchistioidesandPenaeopsisswarm at the surface in similar fashion, and salmon parr approach the surface most nearly when sunlight decreases to starlight.

ISSN:0706-652X    

DOI:10.1139/f47-028

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

When sterile cod muscle was inoculated with pure cultures of bacteria and held at 3 °C., it was found that the common spoilage odours were rapidly produced byPseudomonas,Proteus,AchromobacterandSerratiaspecies.MicrococcusandFlavobacteriumspecies produced milder forms of spoilage and much more slowly. Mesophilic species which rapidly decompose fish at 25 °C. produce no apparent spoilage at 3 °C. even when the initial inoculum contains a very large number of cells.

ISSN:0706-652X    

DOI:10.1139/f47-029

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Bacterial counts are valueless as a measure of the degree of spoilage in fresh fillets.There is a very close correlation between the number of psychrophilic gram-negative organisms on fillets and their keeping time in cold storage. This correlation degenerates into a 'general tendency' which cannot always be applied to individual samples, if the counts used include all the organisms growing on plates incubated at 25 °C. Counts made on plates incubated at 37 °C are of no value for estimating the keeping quality of fillets stored at low temperatures.

ISSN:0706-652X    

DOI:10.1139/f47-030

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

A method of separation of the unsaponifiable matter of marine animal oils has been developed, using the technique of flowing chromatography. Four fractions were obtained by the successive use of light petroleum, methylene chloride, ethyl ether, and methanol with a column of alumina. On the basis of these studies, the hypothesis is proposed that the substances occurring in any one fraction are of similar chemical structure.

ISSN:0706-652X    

DOI:10.1139/f47-031

出版商:NRC Research Press    

年代:1948

数据来源: NRC