摘要:

A complex polysaccharide has been isolated from the fresh-water alga,Anabaenacylindrica, grown in a synthetic culture medium. Prolonged acid hydrolysis yielded glucose, xylose, glucuronic acid, galactose, rhamnose, and arabinose in a molar ratio of 5: 4: 4: 1: 1: 1. Chemical fractionations of the polysaccharide material from solution in cupriethylenediamine, and of its acetate from organic solvents indicated chemical homogeneity.

ISSN:0008-4042    

DOI:10.1139/v54-131

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The 2-phenylethyl halides were prepared from the treatment of 2-phenylethanol-1-C14with thionyl chloride alone, thionyl chloride in pyridine, 48% hydrobromic acid, 55% hydroiodic acid, or phosphorus and iodine. Except for the reaction with thionyl chloride in pyridine, these reactions gave rise to some rearrangement of the C14activity from the C-1 to the C-2 position. It appears probable that these rearrangements resulted from reactions having the SN1 type of mechanism with the phenylethyl cation as reaction intermediate. The fact that the thionyl chloride in pyridine treatment leads to a product without rearrangement is of interest in that this method may have further applications in synthetic tracer chemistry.

ISSN:0008-4042    

DOI:10.1139/v54-132

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Attempts to prepare glycocyamidine by the cyclization of ethyl guanidoacetate in aqueous solutions gave mixtures of guanidoacetic acid and glycocyamidine. The properties of a sample of pure glycocyamidine, which was obtained from the reaction of guanidine with ethyl glycinate, are described.

ISSN:0008-4042    

DOI:10.1139/v54-133

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The absolute fission yield of Ba140in the thermal neutron fission of U235has been determined to be (6.32 ± 0.24)%. The reaction B10(n, α)Li7was used as a neutron monitor and the B10/B11ratio determined mass spectrometrically before and after neutron bombardment. The Ba140disintegration rate was determined using 4π counting techniques. The half-life of La140has been found to be 40.31 ± 0.06 hr.

ISSN:0008-4042    

DOI:10.1139/v54-134

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Amaranth, a food color, has been studied polarographically over a pH range of 2.0 to 10.0 in aqueous solution and was found to give a well-defined wave, diffusion controlled and suitable for quantitative work. Irreversibility was indicated by the behavior of the half-wave potential to changes in pH and concentration. With pH, a direct relationship of −0.080 v. per pH unit held between pH 2.0 and 7.0, while with concentration, the half-wave potential was found to apparently vary directly with the logarithm of concentration. Using a coefficient of diffusion value obtained by conductance measurements the value ofnfor the reaction was calculated to be 4, which corresponds to a rupture of the azo group to yield the corresponding amines.

ISSN:0008-4042    

DOI:10.1139/v54-135

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

n-Eicosenoic acid (as acid or ester) was isolated from the following oils: rutabaga seed (BrassicanapobrassicaMill.), frenchweed seed (ThlaspiarvenseL.), dogfish liver (SqualusacanthiasL.), and the blubber oil of the beluga or white whale (Delphinapterusleucas[Pallas]).The eicosenoic acid from each of these materials was found to have the unsaturation in the 11,12 position. The content of eicosenoic acid in the four oils is estimated as follows (% of the total fatty acids): rutabaga 6, frenchweed 7, dogfish liver 11, beluga 4. The best sources, in respect to yield and purity, were frenchweed seed and rutabaga seed.The frenchweed oil had the following fatty acid composition (% total fatty acid): saturated acids 3, oleic 16, linoleic 25, linolenic 12, eicosenoic 7, erucic 37.9-Hexadecenoic acid was identified as a constituent of dogfish liver oil and beluga oil.

ISSN:0008-4042    

DOI:10.1139/v54-136

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

An investigation of the mass spectrum of titanium tetrachloride prepared from both commercial titanium dioxide and titanium minerals has been carried out, using a 180° Nier-type mass spectrometer. Values for the relative abundances of the titanium and chlorine isotopes have been found. Measurements of the singly ionized trichloride group show that any variation in the relative abundances of the isotopes of titanium contained in these samples must be less than one per cent.

ISSN:0008-4042    

DOI:10.1139/v54-137

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v54-138

出版商:NRC Research Press    

年代:1954

数据来源: NRC