摘要:

A study was made of the precipitation of the chromates of copper, cadmium, cobalt, zinc, and iron at room temperature. The concentration of the reacting metallic salt solutions was kept constant, and that of the potassium chromate solutions was varied regularly. Solutions were mixed in less than one-tenth of a second, and the rate of mixing was accurately determined. The ratio of oxide to chromium trioxide was found by analysis for chromium trioxide and the metal on the same portion of the precipitate. If the ratio remained constant with varying concentrations of reactants, a definite compound was indicated. The composition of the precipitates obtained with copper salts approached that of the normal chromate. Cadmium and cobaltous salts always gave normal chromates. Zinc and ferric salts yielded only basic mixtures.

ISSN:1923-4287    

DOI:10.1139/cjr38b-004

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

The influence of three distinct activators prepared from tomatoes, yeast, or liver, on the metabolism of two species of lactic acid bacteria has been studied. One of these activators is Bios IIA, and the other two have been shown to be components constituting Bios IIB. On the basis of their physical and chemical properties, it is suggested that the growth stimulants required by the lactic acid bacteria are identical with certain of the heat-stable accessory food factors of the Vitamin-B complex essential for the growth of animals.

ISSN:1923-4287    

DOI:10.1139/cjr38b-005

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Waste sulphite pulp liquor (obtained in the manufacture of a commercial sulphite pulp from soft woods, principally spruce and balsam) on treatment with aqueous alkali gave vanillin, acetovanillone, phenolic substances, and a tarry resinous product. The yield of acetovanillone is about 5.5% of that of the vanillin formed, or about 0.3% calculated on the basis of the lignin present.

ISSN:1923-4287    

DOI:10.1139/cjr38b-006

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Delphinium browniicontains a total of 0.5% of alkaloids, hydrolysis of which yields a crystalline base, probably C22H37O7N or C23H39O7N, together with anthranilic and methylsuccinic acids. Mannitol is present in considerable amounts.

ISSN:1923-4287    

DOI:10.1139/cjr38b-007

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

The method of Da Schio (1) for the determination of lanital in lanital-wool mixtures has been tried and found to be unreliable. A new and satisfactory method has been developed. This method makes use of the difference in the specific gravities of wool and lanital to separate the fibres by means of a liquid of intermediate specific gravity. The Herzog-Skinkle method has been found to give results that are a little high. The method devised by the author is also applicable to wool-cotton and wool-staple rayon mixtures. Results of tests carried out on various mixtures and by various methods are given.

ISSN:1923-4287    

DOI:10.1139/cjr38b-008

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr38b-010

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr38b-011

出版商:NRC Research Press    

年代:1938

数据来源: NRC