|
1. |
THE BACTERIAL REDUCTION OF SULPHATES |
|
Canadian Journal of Research,
Volume 14b,
Issue 2,
1936,
Page 49-54
J. W. Young,
Preview
|
PDF (450KB)
|
|
摘要:
The presence of sulphate-reducing bacteria in waters of the Coutts area, as indicated by chemical analyses, has been proved, and they have been shown to be absent from deep wells of the Turner Valley area. A limited number of tests indicates that they are absent from deep wells in the Wainwright area. They have been found in Idaho soils and in sewage.A procedure for proving their presence is described; pure cultures have been prepared, and some of their biochemical characteristics have been noted.The significance of the presence of these organisms in deep wells, soils and sewage is discussed, and some problems for further study are indicated.
ISSN:1923-4287
DOI:10.1139/cjr36b-008
出版商:NRC Research Press
年代:1936
数据来源: NRC
|
2. |
STUDIES ON LIGNIN AND RELATED COMPOUNDS: XXI. INSOLUBLE METHANOL LIGNIN |
|
Canadian Journal of Research,
Volume 14b,
Issue 2,
1936,
Page 55-64
Herbert W. Mackinney,
Harold Hibbert,
Preview
|
PDF (559KB)
|
|
摘要:
When spruce wood meal is extracted with anhydrous methyl alcoholic hydrogen chloride, about 30% of the lignin can be removed in soluble form. The insoluble lignin in the residual wood can be isolated as a fully methylated derivative by a prior complete methylation with dimethyl sulphate followed by hydrolysis with methyl alcoholic hydrogen chloride. The fully methylated insoluble methanol lignin is insoluble in organic solvents.Demethylation experiments followed by subsequent treatment with methylating and acetylating agents, alone or combined, have established a very close relation between the insoluble and the soluble form. The formation of the insoluble form from the native lignin is accompanied by loss of one hydroxyl group as indicated in the two formulas: soluble methanol lignin, C42H32O6(OCH3)6(OH)4, and insoluble methanol lignin (fully methylated), C42H32O6OCH3)9. The new evidence obtained indicates that of the five methoxyl groups present in the original native lignin, at least three are phenolic or enolic in character.
ISSN:1923-4287
DOI:10.1139/cjr36b-009
出版商:NRC Research Press
年代:1936
数据来源: NRC
|
3. |
AN INVESTIGATION OF THE ACTION OF CARBON DISULPHIDE AND AQUEOUS POTASSIUM HYDROXIDE SOLUTIONS ON ALKALI LIGNIN |
|
Canadian Journal of Research,
Volume 14b,
Issue 2,
1936,
Page 65-75
R. L. Glover,
J. W. Bain,
Preview
|
PDF (712KB)
|
|
摘要:
Carbon disulphide and aqueous potassium hydroxide solutions act on alkali lignin, forming very viscous mixtures from which colloidal, lignin-like materials containing sulphur and of high molecular weight may be isolated.The hypothesis is advanced that a lignin xanthate may be a step in a theoretical series of reactions culminating in the formation of the materials isolated.The presence and condition of the sulphur in the isolated product are discussed from the standpoint of this hypothesis.
ISSN:1923-4287
DOI:10.1139/cjr36b-010
出版商:NRC Research Press
年代:1936
数据来源: NRC
|
|