摘要:

Comparisons of the loaf volume of composite samples with the average loaf volume of the individuals comprising the composite were made on three groups of samples: namely, (1) samples of pure Marquis grown in one locality in one season, grouped on the basis of protein content; (2) samples of pure Marquis, Reward, and Garnet in separate series grouped on basis of protein, irrespective of locality of origin; and (3) samples of the above three varieties grouped on basis of origin, irrespective of protein content.In these studies the composite samples were all made up after the individual flours had been baked and, therefore, there was admitted an error due to the time factor in respect to age of the flours and also in respect to variability in baking technique. Despite this, however, there was found a very close agreement between the values obtained with the composite samples and the average values of the component flours. There were a large number of cases in which there was practically complete agreement between the two values and only a few in which the differences were very great. The correlation of the two values was on the average of the order of + 0.95 and the conclusion was reached that the data obtained with the composite samples could be used safely as an estimate of the average values andvice versa.

ISSN:1923-4287    

DOI:10.1139/cjr31-088

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

There has been a considerable increase in the amount of bunted wheat in western Canada recently. One hundred and forty-nine varieties and selections of spring wheat showed all gradations in reaction to this disease when inoculated artificially, varying from apparent immunity to high susceptibility. The increase in bunt can be accounted for in part by the use of certain varieties that are more susceptible than some of those grown formerly. There has also been an increase in the number and virulence of physiologic forms. One physiologic form ofT.triticiand five ofT.leviswere obtained from six collections of bunt in this study. The isolation and study of relatively pure forms of the organism will be necessary for a study of the genetic factors in the host governing the reaction to bunt. Inheritance studies at present indicate that multiple factors, the exact nature of which has not yet been determined, govern the reaction to this disease. Production of resistant varieties suitable for the prairie provinces of Canada offers a very promising means for reducing the losses due to bunt of wheat.

ISSN:1923-4287    

DOI:10.1139/cjr31-089

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

Honey was found to contain an active principle which stimulated fermentation by certain osmophilic yeasts of the genusZygosaccharomycesin synthetic media. The substance is dialyzable, insoluble in ether and acetone, not precipitated by 85% alcohol, resistant to heating in acid solution and non-volatile. The activating effect of honey is impaired by heating in alkaline solution and by prolonged exposure to moderate dry heat. The active principle may be separated into two fractions by selective adsorption by charcoal. The adsorbed fraction, which may be recovered by elution with alcohol, and the unadsorbed fraction are relatively inert alone, the presence of both being necessary for the active stimulation of fermentation.

ISSN:1923-4287    

DOI:10.1139/cjr31-090

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

A bioactivator from honey, stimulating osmophilic yeasts, was compared with Bios. Complementary fractions from treatment with charcoal were found to exert effects similar to Bios I (inosite) and Bios II of Miller and associates, when tested with the Toronto strain ofSaccharomyces cerevisiae. Charcoal treatment of honey removes by adsorption Bios II leaving a residue, relatively inert by itself, containing inosite. Inosite, however, does not appear as the active substance in the charcoal filtrate for the strain of osmophilicZygosaccharomycestested, the growth of this organism being dependent upon the presence of another substance which, though not essential for the Toronto yeast, appears to be present in crude Bios II.

ISSN:1923-4287    

DOI:10.1139/cjr31-091

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

This is a continuation of observations published in this Journal (4). It deals with an electrical photometer of high sensitivity but unaffected by red light. This is used in conjunction with the projection microscope and applied to a study of red blood cells stained with basic fuchsine. The measurements reported are a complex of staining intensity and area. These are compared with area estimations alone and it is shown that the former constitutes a greater variable than the latter. This is particularly noticeable when dealing with anemic blood. The relationship between primary and secondary anemia of man is touched upon.

ISSN:1923-4287    

DOI:10.1139/cjr31-092

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

In the first part of the paper the theoretical basis of the formulas, given in a previous communication, for the generation of heat in a poorly conducting dielectric which is placed in the field of a high-frequency oscillator, is examined in some detail. Its application to the complicated case met with in medical "radiothermy" is made and it is shown that the analysis applies with satisfactory accuracy to this case, though not to that of electrode diathermy. Prediction of the "selective" effect is possible from a knowledge of the characteristic electrical constants of the body-substances at high frequencies, and by proper choice of wave-length the heating of a particular part might be favored over that of neighboring parts.In the second part of the paper, experimental work is described which carries verification of the formulas to shorter wave-lengths. Experiments on the heating of meat demonstrate the selective effect and its dependence upon wave-length. The heating of such substances as liver, heart, and the different parts of an egg, are examined experimentally as examples of the various determining factors that are involved.The theoretical explanation of the effects is considered satisfactory and further developments depend upon the results ofin vivaexperiments with shorter wavelengths than those at present in general use.

ISSN:1923-4287    

DOI:10.1139/cjr31-093

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

The range of the α-particles from uranium II has been determined by a scintillation method to be 3.29 ± 0.08 cm. at 15 °C. and 760 mm. This is in good agreement with Laurence's value found with a Wilson chamber. From the Geiger-Nuttall relationship the period is calculated to be 28,000 years, a value considerably less than that found recently by direct measurement.

ISSN:1923-4287    

DOI:10.1139/cjr31-094

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

This paper is a report of work carried out at the Macdonald Physical Laboratory on the Raman effect of benzene and toluene. The six-prism spectrograph, used by Dr. J. S. Foster for his work on the Stark effect, was employed in the investigation. It was found that a number of entirely new lines were observed in the Raman spectrum of both liquids. Some of these are due to the separation into components of previously observed lines; others are entirely new. Accurate measurements are given of the Raman frequency shifts and comparison with other results is afforded.

ISSN:1923-4287    

DOI:10.1139/cjr31-095

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

A description is given of the properties of the cellulose obtained from glucose by the action ofAcetobacter xylinus.Acetylation of the product gives a yield of 98.8% of a triacetate identical with cellulose triacetate, and the cellulose regenerated from the acetate is identical with the starting material. The triacetate, when spun dry from solution in chloroform, gives a silk-like fibre which on de-acetylation yields a fibre showing the same X-ray diffraction pattern as natural cellulose. Acetolysis of the acetate yields cellobiose octacetate.Treatment of the triacetate with methyl alcohol containing HCl gives a yield of 94.1% of α- and β-methylglucosides, while on direct hydrolysis of the cellulose with a solution of zinc chloride in hydrochloric acid, a practically quantitative yield (99.5%) of glucose is obtained.Simultaneous de-acetylation and methylation of a partially saponified acetate soluble in acetone gave trimethyl cellulose (yield, 84.6%). The latter, on hydrolysis with methyl alcohol containing HCl, yielded 2:3:6-trimethyl methylglucoside (yield, 92.3%) which, in turn, was converted into crystalline 2:3:6-trimethyl glucose (yield, 83.5%). The last two compounds were found to be identical in every way with the same products prepared from ordinary cotton cellulose. It follows from this that the cellulose obtained by direct bacterial synthesis from glucose is identical with natural cellulose.

ISSN:1923-4287    

DOI:10.1139/cjr31-096

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

Because of the interest attached to N-methyltryptamine on account of its occurrence as an integral part of the calycanthine molecule, the free base and some of its derivatives have been synthesized. An account of the synthesis of N,N-dimethyltryptamine together with some carbolines derived from 1-methyltryptamme is also included. Finally, a detailed procedure for an improved preparation of tryptamine is given.

ISSN:1923-4287    

DOI:10.1139/cjr31-097

出版商:NRC Research Press    

年代:1931

数据来源: NRC