摘要:

The compounds 1,1-bis-(p-fluorophenyl)-2,2,2-trichloroethane, 1,1-bis-(p-chlorophenyl)-2,2,2-trifluoroethane, and 1,1-bis-(p-fluorophenyl)-2,2,2-trifluoroethane have been prepared, and their method of preparation is outlined. The toxicity of these compounds toDrosophila melanogastersupports Läuger's hypothesis of the mechanism of the action of DDT.

ISSN:1923-4287    

DOI:10.1139/cjr46b-012

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Flow–pressure relations have been determined for suspensions of calcium soaps in mineral oils of varying viscosity and viscosity index. The effect of small amounts of reagents on the character of these curves is very marked. The addition of water generally increases the yield value of the system without affecting the mobility, while solvents for calcium soaps tend to change the mobility without altering the yield value.

ISSN:1923-4287    

DOI:10.1139/cjr46b-013

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

An apparatus has been built to control automatically the addition of gas, from a gas burette, to a system maintained at constant pressure. A phototube-relay, actuated by the mercury level of a manometer connected to the system, acts as the control mechanism for the gas input.

ISSN:1923-4287    

DOI:10.1139/cjr46b-014

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Viscosities of solutions of a number of types of nitrocotton in a mixed solvent consisting of 80% glyceryl trinitrate and 20% ethylene glycol dinitrate by weight have been measured in a modified Stormer viscometer. Complete solution was attained only with difficulty, but such solutions when obtained showed viscosity–concentration relations similar to those obtained with acetone solutions.

ISSN:1923-4287    

DOI:10.1139/cjr46b-015

出版商:NRC Research Press    

年代:1946

数据来源: NRC