摘要:

A solution of plastein in strong urea was injected into guinea-pigs and was found to give a slight anaphylactic reaction. The urea solution was also analysed in the velocity ultracentrifuge, and was shown to contain particles of protein dimensions, but sedimented in a completely inhomogeneous manner. The proteose substrate showed no sedimentation.It is concluded that, although the plasteins are formed as a result of a true enzymatic synthesis, and have protein properties, they are not definite entities comparable to typical proteins.

ISSN:1923-4287    

DOI:10.1139/cjr40b-038

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

The quantitative determination of the absorption by polystyrenes of oxygen from benzoyl hydrogen peroxide yields low results in all cases. The action of bromine on polystyrenes is a function of the concentration. With relatively higher concentrations of bromine the values obtained for added bromine are often negative. With more dilute solutions the added bromine always has a real value although it is never more than half the theoretical value and often less. In this case also the substituted bromine is low. The results obtained with the more dilute solutions of bromine might be interpreted by the assumption that polystyrenes are mixtures of saturated and unsaturated individuals, if conclusions based on a reaction so thoroughly affected by concentration and yielding in some cases negative values for added bromine were not altogether untrustworthy.

ISSN:1923-4287    

DOI:10.1139/cjr40b-039

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

A method for sealing platinum through Pyrex glass and the use of platinized glass in the construction of various laboratory devices are described.

ISSN:1923-4287    

DOI:10.1139/cjr40b-040

出版商:NRC Research Press    

年代:1940

数据来源: NRC

摘要:

Measurements of the viscosity of carbon dioxide in the critical region have been made with great precision by means of an oscillating disc viscosimeter. The variation of viscosity with temperature at constant density has been determined for 14 different densities. Isothermals have been evaluated from a plot of the isochores. One isothermal was determined directly and is in agreement with those determined indirectly.The form of the viscosity-temperature isochores is not the same as that found by Mason and Maass (12) for ethylene, in that there is no minimum at the critical temperature nor even up to 7 °C. above. For the region just above the condensation temperature, the viscosity is more dependent on density than on temperature; the isochores are almost flat and are well separated. However, the isothermals are spread between an upper and a lower limit of density, showing that viscosity is not entirely independent of temperature. Time lags were observed in the present investigation in the opposite direction to those observed by Geddes and Maass (9); this would appear to decrease the strength of their claims that the time lags that they observed are due to the formation of a structure in the liquid state.

ISSN:1923-4287    

DOI:10.1139/cjr40b-041

出版商:NRC Research Press    

年代:1940

数据来源: NRC