摘要:

The heats of wetting of dry cotton cellulose by several pure and aqueous alcohols have been measured for the first time. The rate at which the wetting occurred was also determined. The results indicate a preferential sorption of water from the aqueous alcoholic solutions. This conclusion is supported by similar measurements in experiments in which absolute alcohols were allowed to wet cellulose containing various amounts of previously adsorbed water.

ISSN:1923-4287    

DOI:10.1139/cjr37b-049

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

A technique has been devised for studying the delignification of wood in sulphite liquor under accurately controlled conditions. The rate of delignification of resin extracted spruce wood-meal has been determined at 130 °C. over the concentration range 0.2 to 1.4% combined, and 2 to 14% total, sulphur dioxide. The reaction shows a systematic deviation from the first order relation that is the same for any composition of liquor. A quantitative relation between the rate of delignification and the concentration of free sulphur dioxide, or better, the partial pressure of sulphur dioxide gas, has been established. The nature and significance of this relation is discussed in connection with the mechanism of the delignification process. It has been shown that the hydrogen ion concentration alone does not determine the rate of cooking, but evidence is presented that indicates that the product of the concentrations of the hydrogen and bisulphite ions is the controlling factor.The yield of pulp for any given lignin content is independent of the free sulphur dioxide over the whole concentration range, but increases in a marked manner with the concentration of the combined. An explanation is offered, and the practical aspects are pointed out.

ISSN:1923-4287    

DOI:10.1139/cjr37b-050

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

An improved procedure for the separation of nucleic acid material from soil is described. By its use as much as 65% of the apparent organic phosphorus in soil has been separated in the nucleic acid fraction; this shows that most of the soil organic phosphorus exists in this form. Material of this nature enters the soil solution.The material separated yielded, on hydrolysis, phosphoric acid, pentose sugar, adenine, and uracil. This indicates that it is a mixture of mononucleotides.The presence of traces of ether-soluble phosphorus in soil was confirmed.

ISSN:1923-4287    

DOI:10.1139/cjr37b-051

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The neutral product of the condensation of phenylacetaldehyde with ethylsodiocyanoacetate when distilled under low pressures loses the elements of ethyl alcohol and forms 1-hydroxy-2-naphthoic nitrile. This is identical with the synthetic substance prepared through a series of reactions from α-naphthol. The methyl ether has been prepared from both the synthetic substance and the product of the condensation. 1-Hydroxy-2-naphthoic nitrile can be coupled readily withp-nitrobenzenediazonium chloride. The evidence relating to the structure of the neutral condensation product is reviewed.

ISSN:1923-4287    

DOI:10.1139/cjr37b-052

出版商:NRC Research Press    

年代:1937

数据来源: NRC

摘要:

The dextran synthesized from sucrose by the action of one strain ofLeuconostoc mesenterioideshas been subjected to chemical investigation. The polysaccharide has been hydrolyzed to glucose. The triacetate, tribenzoate, and trimethyl derivative (all calculated on a glucose anhydride unit) have been prepared. Hydrolysis of trimethyl dextran by the action of methanol-hydrochloric acid yielded dimethyl, trimethyl, and tetramethyl methyl glucosides in the ratio of 1: 3: 1. The products of hydrolysis have been identified as 2,3-dimethyl methyl glucoside, 2,3,4-trimethyl methyl glucoside, and 2,3,4,6-tetramethyl methyl glucoside.The results indicate that dextran is a polymer of a pentaglucopyranose anhydride. One of the glucopyranose units is attached as a side chain, the remaining four being most probably connected in linear chain union. Three of the linkages between building units are of the 1,6 type, while the remaining two are either 1,4 or 1,6.The antigenic properties shown by dextran are probably a result of the presence of the glucose side chains.

ISSN:1923-4287    

DOI:10.1139/cjr37b-053

出版商:NRC Research Press    

年代:1937

数据来源: NRC