摘要:

Carefully conducted flavor tests and chemical analyses for chloride ion showed that bacon of the Wiltshire type increased in saltiness and water extractable chloride during storage. Enzyme digests of freshly cured pork gave higher chloride recoveries than those obtained in water extraction procedures. On the other hand, recovery of sodium ion in freshly cured material was identical by water extraction, enzyme digestion, or a wet ashing procedure. These results show that the chloride ion is bound by the muscle constituents and that it can be released by enzyme action. This mechanism would explain the increase in saltiness observed in stored bacon.

ISSN:1923-4287    

DOI:10.1139/cjr48f-001

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Significant amounts of thiamine and niacin, but not of riboflavin, were lost during the process of curing pork half-backs in brine pickle on a semicommercial scale. This loss was not related to the final chloride or nitrate content of the meat. Cured half-backs stored at 30° F. (−1.1 °C.) for 24 days lost significant amounts of thiamine and riboflavin, but the niacin content remained unchanged. Curing caused a significant increase in the percentage of niacin retained after cooking. During the storage of cured half-backs, the percentage of thiamine retained after cooking increased significantly.

ISSN:1923-4287    

DOI:10.1139/cjr48f-002

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

A modification of the Teitelbaum and Harne apparatus for measuring oxygen consumption in guinea pigs has been described. Typical results are given to illustrate the usefulness of the apparatus.

ISSN:1923-4287    

DOI:10.1139/cjr48f-003

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Reducing sugar determinations have been proposed as an over-all measure of both bacteriological and chemical changes in frozen egg. When applied to commercial products, the technique recommended has been found to yield poorly reproducible results, while reducing sugar readings show no correlation with viable or microscopic counts of bacteria. Few of the bacteria isolated from commercial melange were able to ferment glucose.

ISSN:1923-4287    

DOI:10.1139/cjr48f-004

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Unbleached cotton tentage duck was impregnated with chromic oxide, copper carbonate, and ferric oxide, both singly and in mixtures, each metal being present in concentration of approximately 1% as metallic oxide, and also in the form of naphthenates in equivalent concentration. The rot resistance of the treated samples was determined by measuring the loss of breaking strength on soil burial after leaching in water and after outdoor weathering for four months. Photochemical degradation on weathering was determined by measuring the loss of breaking strength and increase in cuprammonium fluidity. The decrease in metal content on weathering was also measured.Samples treated with chromium and iron in inorganic form, used singly and together, showed no resistance to soil burial and very slight resistance when the metals were present as naphthenates. All treatments containing copper produced substantial resistance to soil burial, the mixtures producing greater resistance than the single compounds; the resistance resulting from treatment with chromium plus copper and with chromium plus copper plus iron mixtures was greater than that from the corresponding copper plus iron treatments. On the whole, the inorganic treatments produced more resistance to soil burial after leaching than the organic treatments but, after weathering, the copper alone and copper plus iron treatments produced less resistance than the corresponding naphthenate treatments.All the inorganic treatments containing chromium exerted a marked protective effect against deterioration resulting from weathering as judged by breaking strength losses and increases in cuprammonium fluidity.The naphthenate treatments containing chromium and the iron oxide and iron naphthenate treatments afforded some protection with respect to breaking strength loss but produced fluidity increases approximately the same as that of the untreated fabric. Similar results were obtained with the copper carbonate plus iron oxide treatment.The samples treated with copper carbonate and copper naphthenate showed breaking strength losses approximately the same as that of the untreated control but gave evidence of enhanced degradation as judged by the fluidity data.Losses of chromium on weathering were negligible in all cases while losses of iron ranged from zero to 34%. Complete loss of copper occurred in the copper carbonate treated sample and a slightly lower loss (85%) in the copper plus iron treated sample. In the presence of chromium and chromium plus iron, the losses of copper were reduced to 34% and 54% respectively. Similar trends were observed with the naphthenate treatments but the losses were much lower in all cases, ranging from no significant loss to a loss of 48%.

ISSN:1923-4287    

DOI:10.1139/cjr48f-005

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Reynolds Numbers for the commonly used rates of flow of a reacting mixture through a conventional combustion tube are far below the critical value. The laminar flow to be expected accordingly is disturbed by convection currents when the tube is heated and flow configuration depends on such factors as ratio of length to diameter and temperature gradients but can be varied by creating local differences of flow velocity within a uniformly heated reaction space such as reaction chamber No. 10 described in Part I. The effects on reaction velocity of the factors mentioned have been determined by experiments described in this part. The results indicate that the velocity of a heterogeneous reaction is determined by flow configuration, that 'packing' does not distinguish between homogeneous and heterogeneous reactions and that the oxidation of pentane, taken as a typical hydrocarbon, is a heterogeneous reaction.

ISSN:1923-4287    

DOI:10.1139/cjr48f-006

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr48f-007

出版商:NRC Research Press    

年代:1948

数据来源: NRC