摘要:

In the present contribution four species ofPeniophoraand five ofCorticium, collected in British Columbia and presumed to be new to science, are described and illustrated.

ISSN:1923-4287    

DOI:10.1139/cjr49c-011

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The endogenous respiration ofPseudomonas aeruginosawas shown to differ in several respects from that of other organisms. Although values obtained for the degree of oxidative assimilation of glucose agree with those reported by other workers, this synthesis of storage products was found not to be inhibited by the usual concentrations of 2,4-dinitrophenol. The techniques commonly employed to reduce stored products had no effect on this organism. The endogenous respiration was shown to function normally in the presence of added substrate.

ISSN:1923-4287    

DOI:10.1139/cjr49c-012

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Acetic acid has been isolated as an intermediate compound in the oxidation of glucose or α-ketoglutaric acid byPseudomonas aeruginosa. Cells of this organism produced under conditions of intense aeration were found to have lost the ability to oxidize acetic acid and this compound was found in large quantities in the growth medium. When these cells were used to carry out the oxidation of glucose, it was found that the oxygen consumed was the amount needed to convert glucose to acetic acid, thus confirming the role of acetate as an intermediate in glucose oxidation. In contrast to the above-mentioned criteria the technique of simultaneous adaptation ruled out acetic acid as a possible intermediate in the oxidation of either glucose or α-ketoglutaric acid. The status of the theory of simultaneous adaptation is discussed in relation to the data obtained.

ISSN:1923-4287    

DOI:10.1139/cjr49c-013

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

When plants of a variegated barley are self-pollinated, they produce few variegated and many albino offspring. In different years the proportion of albino plants has ranged from 80.2 to 93.1% of the total population. Seed from heads having much green tissue gave rise to a much larger proportion of variegated plants than did seed from heads with more white tissue. Maternal inheritance of plastids is probably the cause of this difference. In crossesF1plants are green, variegated, or albino if the ♂ parent is variegated, but if the ♂ parent is green all the progeny are green. The albino plastids thus apparently do not mutate back to normal in the presence of the normal gene. In someF2populations deviation from a ratio of 3 green: 1 others is insignificant, in other populations significant deviations, attributed to irregularities of plastid mutation and segregation, occur.F3results support the hypothesis that a single pair of genes affecting plastids is segregating in hybrids. The normal (green) gene is dominant if "green" proplastids are present in the egg but not dominant if the proplastids are all "white". From cytological observations on sperms and eggs as well as from the genetic results, it is considered likely that direct plastid transmission to zygotes is exclusively from the female par

ISSN:1923-4287    

DOI:10.1139/cjr49c-014

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The superiority of methods involving the use of sporulation media containing acetate, first introduced by Stantial and Elder, over several commonly employed methods is established. A new method for obtaining ascospores from bakers' yeast cultures is recommended involving the direct transfer of vegetative cells from a solid nutrient medium to a solid medium containing acetate. High yields of ascospores are consistently produced after seven days' incubation. This method should lend itself particularly to use in the preparation of ascospores for instructional work, and for genetic research in yeast, and may also find application in yeast taxonomy. The technique recommended is as follows: vegetative yeast cells are multiplied on tomato juice agar or on dextrose nutrient agar, and are then transferred to a solid sporulation medium containing 0.04% dextrose, 0.14% anhydrous sodium acetate, and 2% agar.

ISSN:1923-4287    

DOI:10.1139/cjr49c-015

出版商:NRC Research Press    

年代:1949

数据来源: NRC