摘要:

The combustibility of organic matter-sodium chlorate mixtures in various proportions has been tested at different relative humidities. It was found that mixtures containing more than 10% of sodium chlorate are sufficiently combustible to be hazardous at all relative humidities below 75% but are non-hazardous at higher humidities. Data were obtained showing the minimum moisture content required for protecting such mixtures and this information may be used to calculate the approximate amount of any water-absorbing chemical that has to be added to sodium chlorate to render it safe. Admixture of calcium chloride or magnesium chloride with the sodium chlorate renders the mixture safe when these protecting salts form one-half and one-third respectively of the resulting herbicide. Judging from the chlorate content the above sodium chlorate-magnesium chloride mixture would be the most effective "safe" herbicide of those tested, but it would be about only half as toxic as pure sodium chlorate. Several other salts were tested as protecting agents but they were either ineffective or resulted in the decomposition of the chlorate. Combustibility tests were also conducted on barium chlorate- and calcium chlorate-organic matter mixtures. These mixtures are less inflammable than those containing sodium chlorate but are sufficiently combustible to be a fire hazard in districts where the atmospheric humidity is low. Addition of one part of anhydrous calcium chloride or magnesium chloride to two parts of barium chlorate results in a safe mixture. Sodium dichromate-organic matter mixtures are much less combustible than those containing chlorate, but these mixtures also are somewhat dangerous at ordinary humidities when there is a high proportion of sodium dichromate in the mixture. When 10% of anhydrous calcium or magnesium chloride is added to the sodium dichromate the resultant mixture is safe under ordinary atmospheric humidities, regardless of the proportion of organic matter present. Mixtures of sodium chlorate and sodium dichromate with organic material are extremely combustible.

ISSN:1923-4287    

DOI:10.1139/cjr33-052

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

The antagonistic and compatible growth relationships of 66 cultures of bacteria and fungi, most of which were from the soil, towardsO.graminison potato dextrose agar and Molisch's salt peptone agar, were compared with the effect of each on the virulence of this pathogene on wheat seedlings in open soil culture.Of the 21 cultures which controlled the virulence ofO.graminisin the soil, only 15 of these were antagonistic on potato dextrose agar, while of the 45 cultures which gave intermediate or no control, 17 were compatible and 28 were decidedly antagonistic. From data secured indirectly, the antagonism or compatibility of the micro-organisms towardO.graminis, observed on potato dextrose agar, did not seem to depend on active alkali or acid more than on other metabolic products. The study apparently demonstrates that the growth reaction of various micro-organisms andO.graminis, associated on the two solid media used, is not a reliable indication that the same micro-organism will or will not suppress the virulence of this pathogene on wheat in soil in open pot culture.

ISSN:1923-4287    

DOI:10.1139/cjr33-053

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

Lipoids which were extracted from immune tuberculosis serum at low temperatures by various procedures and solvents were examined by the tuberculo-complement-fixation test; antibodies were not found in the lipoid fractions, but were retained with the protein fraction of the serum. The use of desorbents, benzoic acid in alcohol, or saponin,—during the extraction, or the preliminary destruction of serum proteins by trypsin, did not result in antibodies being detected in the lipoid fractions. These results conform with other evidence which suggests that antibodies are protein in nature.

ISSN:1923-4287    

DOI:10.1139/cjr33-054

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

I. A method is described for producing on the screen of a cathode ray oscillograph a curve showing the oscillations occurring in a solid rod or disk as the result of impact. These curves are usually quite complex, as they represent combinations of several different modes of vibration. They may be analyzed, however, so that for any specimen the various component frequencies may be determined. This has been done for a great number of rods and disks, and the experimental frequencies so obtained have been compared with those calculated from theory. A discussion of the results is given.II. The solutions given by Love (5, p. 291) for the general equations of vibration applicable to transverse waves in cylindrical rods are examined, and it is shown that they do not apply to comparatively short rods. Other solutions of the same simple form are considered, and the conclusion is finally reached that a much more complex solution will be required to satisfy all the boundary conditions.

ISSN:1923-4287    

DOI:10.1139/cjr33-055

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

An electrostatic voltmeter which is of fairly simple construction is described. It has a scale which is more nearly linear than is usually found with such instruments, and which can be applied to several different voltage ranges.

ISSN:1923-4287    

DOI:10.1139/cjr33-056

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

The specific conductivities of saturated solutions of calcium hydroxide have been measured from 0° to 130 °C. Special precautions were taken to eliminate errors due to impurities. The degree of dissociation and so called dissociation constants have been calculated for these solutions from 0° to 100 °C. These data have been used to calculate a new set of solubility data for calcium hydroxide at temperatures from 0° to 25 °C. Solubilities of calcium hydroxide have been measured over this temperature interval by an indirect method, and the results are in fair agreement with the calculated values.

ISSN:1923-4287    

DOI:10.1139/cjr33-057

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

Five commonly used alkaline soap builders, namely, caustic soda, soda ash, modified soda, sodium metasilicate, and trisodium phosphate have been tested for detergent efficiency in full-scale power laundry tests. The above sequence represents their decreasing order of efficiency.Optimum detergent conditions do not occur at the same pH value for each builder nor is the same quantity of soap required to produce effective washing.All builders studied are free rinsing and produce no loading of the fabrics. Optimum quantities of builder to produce the maximum detergent effect are tabulated.

ISSN:1923-4287    

DOI:10.1139/cjr33-058

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

A chemical examination ofDicentra eximiahas resulted in the isolation of six alkaloids. Protopine and dicentrine together constitute the greater portion of the total bases whiled-glaucine was obtained in minute amounts. Two of the three other alkaloids, all of which appear to be new, resemble corydine and isocorydine and have been namedeximineandeximidinerespectively. They are isomeric and are best represented by the formula, C17H13N (OMe)3(OH). The sixth base was obtained in traces only and until further characterized will be referred to as alkaloid (δ). The yields of purified alkaloids obtained were as follows: dicentrine, 0∙41; glaucine, 0∙03; eximine, 0∙30; eximidine, 0∙04; protopine, 0∙45; alkaloid (δ), 0∙01%: total, 1∙24%.The alkaloid isolated by Eggleston, Black and Kelly fromD.eximiaand namedeximineby them is identical wi

ISSN:1923-4287    

DOI:10.1139/cjr33-059

出版商:NRC Research Press    

年代:1933

数据来源: NRC

摘要:

Benzaldehyde ando-chlorbenzaldehyde were readily condensed with ethyl and methyl malonate, giving rise to unsaturated esters. The esters were condensed with anthrone in alcoholic solution in the presence of piperidine. Hydrolysis of the product with sulphuric acid yielded β-anthronyl-β-phenyl-propionic acid. The chloride of this acid was formed by the action of phosphorus pentachloride. Two tautomeric derivatives of γ-anthronyl-α-hydrindone result from the action of aluminium chloride on β-anthronyl-β-phenyl-propionyl chloride. No benzanthrone derivatives were formed.The action of bromine on the two tautomeric forms of γ-anthronyl-α-hydrindone gave rise to one monobromide only, and oxidation of the two tautomers yielded only anthraquinone and phthalic acid.The method of preparation of β-anthronyl-β-phenylpropionic acid has been improved and the following compounds have been described, as far as the authors are aware, for the first time: the dimethyl and diethyl esters ofo-chlor-benzylidene - malonic acid and anthrone -o- chlorbenzylidene - malonic acid; anthrone - benzylidene - diethyl - malonate; β-anthronyl - β- (o- chlorphenyl) - propionic acid; the silver salt, chloride, amide, anilide, methyl and ethyl esters of β-anthronyl-β-phenyl-propionic acid; γ-anthronyl-α-hydrindone (enolic and ketonic forms); γ-anthronyl-β-brom-α-hydrindone; and the hydrazone hydrate, phenylhydrazone, oxime and semicarbazone of γ-anthronyl-α-hydrindone.

ISSN:1923-4287    

DOI:10.1139/cjr33-060

出版商:NRC Research Press    

年代:1933

数据来源: NRC