摘要:

In theA.polymyxafermentation, aerobic as compared to anaerobic conditions resulted in an increased yield of acetoin plus diol and a decreased yield of ethanol. As the fermentation proceeded under anaerobic conditions, there was a decrease in the proportion substrate being used in the formation of acetoin and diol. This decrease was accompanied by an increase in the formation of acetic acid. During fermentation under aerobic conditions, no decrease occurred in the formation of acetoin plus diol.

ISSN:1923-4287    

DOI:10.1139/cjr47f-033

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

The 10 cultures of bacteria described in this paper developed in an acid (pH 5.0) digest of casein, stored at 4 °C. Six of the 10 cultures wereProteus ichthyosmius, twoPseudomonas schuylkilliensis, oneP.fluorescens, and oneLactobacillus leichmanii. TheProteusandPseudomonasgrow at 0 °C. and theLactobacillusat 0° to 5 °C. With the exception ofPseudomonasthere is no previous record of growth of these organisms at low temperatures.

ISSN:1923-4287    

DOI:10.1139/cjr47f-034

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

The stability of cyanogen chloride in contact with Pyrex glass, aluminium, bakelite, brass, and steel at 20 °C. has been investigated. The tests indicate that crude or purified cyanogen chloride can be satisfactorily and safely stored in contact with any of these materials except brass, provided that precautions are taken to ensure that only relatively small amounts of water or hydrochloric acid are present. Brass has been shown to be entirely unsatisfactory as a container material for either crude or pure cyanogen chloride as it appears to catalyse a decomposition reaction that is not shown by any of the other materials tested.

ISSN:1923-4287    

DOI:10.1139/cjr47f-035

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

During 1945,Salmonellaorganisms (other thanS.pullorum) were isolated from 112 of 400 samples (28.0%) of Canadian dried egg powder. Fourteen types were found:S.oranienburg,S.typhimurium,S.thompson,S.montevideo,S.newington,S.bareilly,S.manhattan,S.potsdam,S.anatum,S.newport,S.Paratyphi B(tartrate positive),S.bredeney,S.tennessee, andS.selandia(listed in order of prevalence).S.pullorumwas isolated from 17 samples. In the majority of samples the most probable number of organisms was less than one per gram. NoSalmonellaorganisms were found on the shells of 12,276 commercial eggs;Salmonellawere isolated from the shells of eight of 24 eggs and later from the meats of two of 144 eggs from infected flocks.

ISSN:1923-4287    

DOI:10.1139/cjr47f-036

出版商:NRC Research Press    

年代:1947

数据来源: NRC

摘要:

The 'heat separator' is a very simple device for attaining a temperature drop of the order of 30 centigrade degrees by means of a stream of air. An air jet enters a long cylindrical chamber near one end, and is directed so as to maintain a high velocity vortex. Air drawn off from the centre of the vortex is cooled, while the remainder, flowing down the length of the chamber, is warmed. The present paper describes results of a quantitative study of the performance of the device. Although the maximum efficiency is only about 15%, as compared with an ideal adiabatic expansion of the total flow, it provides a practical means of cooling for many purposes.

ISSN:1923-4287    

DOI:10.1139/cjr47f-037

出版商:NRC Research Press    

年代:1947

数据来源: NRC