摘要:

The dermatophytes of Canada at present number eight well-established species. On the basis of the morphology of the macroconidium (agreed to be the most valuable taxonomic criterion for dermatophytes) it is suggested thatMicrosporum fulvumbe re-established as a species, and that an Alberta strain ofTrichophyton, previously described, be given species rank and the nameT.Otae. Criteria for species identification other than spore morphology are evaluated. Spores ofT.gypseumare readily obtained on fertile hens' eggs, oidia upon the living chorioallantoic membrane, macro- and microconidia upon the same tissue after death. Macroconidia are produced no more abundantly on the egg than on standard media.

ISSN:1923-4287    

DOI:10.1139/cjr44e-007

出版商:NRC Research Press    

年代:1944

数据来源: NRC

摘要:

Experiments have been conducted on rats to determine what factors may influence mortality and resistance, which have previously been shown to follow traumatic shock produced by the drum method. The resistant condition followed a single exposure to trauma and developed after a latent period of 24 hr. It lasted for four to six days. The degree of resistance was proportional to the severity of the initial trauma.The percentage mortality following continuous and interrupted trauma was determined. Rest intervals between each 100 turns of the drum allowed greater tolerance to trauma. The amount of trauma required to give 50% mortality was directly related to the length of the rest interval. When this was 15 min., 2500 turns was followed by only 17% mortality.Interrupted trauma was found to be followed by resistance after a latent period of 24 hr. The resistance was not as great as that produced by the same amount of continuous trauma.Attempts to transfer resistance by transfusion of rat serum were not successful nor were other experiments designed to explain the mechanism of resistance.The evidence presented suggests that some toxic substance is produced by trauma. This may either cause the death of the animal, or in 24 hr. lead to a resistance to subsequent trauma.

ISSN:1923-4287    

DOI:10.1139/cjr44e-008

出版商:NRC Research Press    

年代:1944

数据来源: NRC