摘要:

Yeast extract, casein hydrolysate, and a mixture of 13 to 20 ammo acids were found to be superior to simpler substances such as ammonium sulphate, urea, potassium nitrate, or asparagine as sources of nitrogen forBacillus polymyxain relation to production of 2,3-butanediol from starch The complex sources of nitrogen were more or less interchangeable for most, but not all strains of this organism with regard to effectiveness for diol production, but the addition of yeast extract to either casein hydrolysate or amino acids resulted in a slightly higher yield of diol and an increase in the diol/ethanol ratio from 2 to 2.6 or higher.The requirements of different strains for specific ammo acids varied somewhat, but the need for isoleucine and asparagine was common to the tour strains studied. A fairly good fermentation was obtained with the most efficient of these strains in a medium containing isoleucine, tyrosine, glycine, methionine, and asparagine after three days' incubation. The fermentation went to completion after five days with certain concentrations of these five acids an effect that was achieved in three days by the addition to these of eight other acids but not by the addition of ammonium sulphate. Suppression of diol production by omission of certain of these amino acids was marked at three days but was largely overcome at five. Cystine (in concentrations above: 0.0125%; was inhibitory to the four strains studied and phenylalanine (0.02%) to one, after three but not after five days.

ISSN:1923-4287    

DOI:10.1139/cjr46c-012

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

A detailed morphological study has led to the conclusion thatEntyloma Glauciishould be included inE.fuscum. The symptoms of the smut onPapaver RhoeasandP.somniferumare described. Study of limited material suggests that the fungus onEschscholziaandDendromeconin California should be retained asE.Eschscholtziae. The production of conidia on these hosts is reported for the first timeEntyloma fuscumfromPapaver Rhoeashas been shown to attackP.atlanticum,P.dubium,P.glaucum,P.monanthum,P.orientale,P.setigerum, andP.somniferum.

ISSN:1923-4287    

DOI:10.1139/cjr46c-013

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

A brown pocket rot of Sitka spruce (Picea sitchensisCarr.) occurs in stands on the Queen Charlotte Islands, B.C. The decay, the sporophore associated with it, and the cultural characters of the fungus are described. The causal fungus is regarded as a new species and is described asLentinus Kauffmaniisp. nov. by Dr. Alexander H. Smith, University of Michigan.

ISSN:1923-4287    

DOI:10.1139/cjr46c-014

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

Bacteriological examination of 1080 eggs from pullorum infected hens showed 78 (7.2%) to be contaminated with coliform organisms, which were classified into various types. No coliform organisms were isolated from 1000 eggs laid by hens free from pullorum disease.

ISSN:1923-4287    

DOI:10.1139/cjr46c-015

出版商:NRC Research Press    

年代:1946

数据来源: NRC

摘要:

For two consecutive years, weekly samples of apples were taken during the development of fruits on the tree and in subsequent cold storage. Following determination of their respiration, the fruits of each sample were analysed for various forms of carbohydrates and also for their insolublePcontent. The last constituent was assumed to represent the 'protoplasmic factor,' Six different physiological stages are distinguished during the ontogeny of apple fruits. These are based on changes in the direction and in the rates of metabolism of various carbohydrates. The first three stages are passed while apples are on tree; the next one is passed either partly or even completely in storage, depending on the date of picking; the last two are passed entirely in storage. At the beginning of storage there was observed a sharp increase in the sugar content or apples. Since there was no corresponding decrease in the alcohol insoluble residue, it was concluded that such sugars must come from some alcohol soluble substances.

ISSN:1923-4287    

DOI:10.1139/cjr46c-016

出版商:NRC Research Press    

年代:1946

数据来源: NRC