摘要:

The tendency of certain glycidol and glycoloside derivatives to polymerize under the influence of heat has been investigated. Phenyl glycidol, methyl glycidol, and 2:3, 6:7-di-epoxy-4, 5-dihydroxy octane all undergo polymerization. With phenyl glycidol acetate the tendency is much less pronounced, while polymerization does not occur with phenyl glycidol methyl ether. Apparently the phenomenon is associated with the presence of a hydrogen atom capable of migration. Polymerized phenyl glycidol was found to have an open-chain structure containing one ethylene oxide ring. 2-Methoxy ethyl glycoloside was obtained as a stable dimer, which appears to have a dioxane structure.

ISSN:1923-4287    

DOI:10.1139/cjr33-019

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

An investigation of the alkaloids ofAdlumia fungosahas confirmed the presence ofprotopine. The alkaloid previously reported as melting at 176–177 °C. proved to be bicuculline. Two new alkaloids, adlumine, C21H21O6N, and adlumidine C19H17O6N (?) have been isolated. These names have been used because it is felt that the alkaloids described by Schlotterbeck under the same names were either impure or improperly analyzed. The investigation is being continued.

ISSN:1923-4287    

DOI:10.1139/cjr33-020

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

A strain of green streptococcus, No. 403, obtained from a case of bovine mastitis and similar to that usually associated with chronic mastitis in cattle, has under stated conditions been passed through Berkefeld N and Chamberland L3, L5 filters. It has been recovered from the filtrates and proved to be identical in its biological characteristics with the original unfiltered strain No. 403.Filtrates of this organism grown in K medium have given the largest number of recoveries, these being 18 out of 20, or 90%. Filtrates of growth in nutrient broth were recovered in 1 out of 20 filtrations, or 5%.Observations on the cultural and morphological appearance of the organism during the stages of its recovery are made. The interpretation of these experiments in the light of Zinsser's postulates is discussed.

ISSN:1923-4287    

DOI:10.1139/cjr33-021

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

This paper presents an account of the more important structural features of a representative of a New World group of species within the generally accepted genusUtricularia, namely,U.purpurea. These species have been relegated to the genusVesiculinaby Barnhart, and the evidence here presented supports his views.A general description is given of the habit and habitat of the plant, in which also the particular points of its form and structure are set forth. The important features of the internal anatomy are given.The structure and behavior of the trap are described. It is shown that, while the mechanical working of the trap is in some respects strikingly different from that of the other species outsideVesiculina, the same fundamental plan of structure is adhered to. A detailed account of the structure of the door and of the threshold and their manner of action is given.

ISSN:1923-4287    

DOI:10.1139/cjr33-022

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

The fungus-flora of 75 samples of surface soils from various parts of Manitoba has been analyzed. The population of fungi in these soils is abundant and varied despite climatic conditions which might appear unfavorable. Forty-four genera and 100 species of fungi have been identified, and the relative frequency of each determined. It has been found that the methods of soil microbiology give data regarding the parasitic as well as the saprophytic fungi in soils; thatTrichoderma lignorumparasitizes certain other fungi, and thus may play a part in keeping in check the pathogenic fungi within a soil; and that the addition of chemical fertilizer to a soil results in a prompt and consistent increase in the fungus-flora.

ISSN:1923-4287    

DOI:10.1139/cjr33-023

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

Greenhouse and field experiments have shown that the use of mechanically injured seed promotes the development of seedling blight and foot rot caused byFusarium culmorumin cereals, thereby retarding the growth of the plants and decreasing yield.

ISSN:1923-4287    

DOI:10.1139/cjr33-024

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

This paper contains the results of a long series of determinations of the specific heats of tungsten, molybdenum, and copper from − 20° to 500 °C.A new type of all-copper adiabatic calorimeter has been designed and used. The complete elimination of water from the calorimeter removed several sources of error and resulted in increased reliability and accuracy.Two entirely different methods were used in determining the specific heats. The usual "method of mixtures" was used to determine the mean specific heat for a large temperature change and was applied to all three metals over the entire range of temperature. The specific heat of copper was also determined for 5- or 10-degree intervals from − 5° to 110 °C. by heating the calorimeter electrically.It has been quite definitely shown that the specific heats of these metals over a temperature range as large as 0° to 500 °C. cannot be expressed as a linear function of the temperature. An equation of the formCp = A + BT − C/T2was arrived at from theoretical considerations and the constants determined empirically with the following results:—where the unit of heat is the 20-degree calorie andTis absolute temperature. The average deviation of the individual determinations from the values calculated by these equations was only about 0.1%.As a matter of convenience and for purposes of comparison, linear equations applicable over smaller ranges of temperature have also been given.

ISSN:1923-4287    

DOI:10.1139/cjr33-025

出版商:NRC Research Press    

年代:1933

数据来源: NRC