摘要:

AbstractRecent successes in the pure culture study of true rumen bacteria responsible for carbohydrate fermentations are outlined. Some account is also given of the rumen ciliate protozoa as fermentative agents. The power of polysaccharide synthesis and storage is very marked in many of these biochemically active rumen micro‐organisms, both bacteria and protozoa. On the other hand little is yet known about individual microbial species responsible for extensive nitrogenous transformations in the rume

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060801

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractPremises where chick growth had been suboptimal without penicillin in the diet were thoroughly cleaned and disinfected. The first few batches of chicks reared there after the disinfection grew well without penicillin, but growth deteriorated in subsequent batches and finally became indistinguishable from that in ‘stale’ premises.In field units that had previously housed other chicks, growth of new chicks was depressed in the absence of penicillin. In new field units on fresh ground chicks grew as well without as with the antibiotic, but two further batches of chicks showed a small increase in weight with penicillin even though the units had been disinfected and moved to fresh l

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060802

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractIsolation units were designed for the study with chicks of the growth‐depressing ‘infection’ counteracted by penicillin. Preliminary results indicated that the ‘infection’ could be transmitted by feeding gut contents from ‘infected’ chicks to newly‐hatched chicks. It was not transmitted by similar gut contents after autoclaving or by gut contents from ‘u

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060803

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractDeterminations have been made of the moisture contents of whole palm kernels kept for times up to 35 days in desiccators over saturated salt solutions for which the relative humidities at 30° are known. The temperature fluctuated between 24° and 31

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060804

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractFactors which must be considered in the drying of foodstuffs are discussed. The conventional hot‐air drying and the vacuum contact‐plate drying methods are described and compared. The latter yields better dried products than the former, both in appearance and palatability of the reconstituted, cooked material, and there is some evidence that the storage properties are also improved. Relevant factors are the absence of oxygen and the milder heat treatment of the foodstuff during vacuum contact‐plate dehydration. This technique is versatile and may be used to dry a wide range of commodities, many of which cannot be dried satisfactorily by conventional me

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060805

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractOn account of the lower temperatures of vaporization at reduced pressures, vacuum evaporators and vacuum dryers have for long been in use for the drying of thermally unstable materials. During the Second World War attempts were made to dehydrate foodstuffs using vacuum‐drying equipment of the types then available but, except in the case of finely divided materials, the results were unsatisfactory. The equipment described in this article comprises a large steel vacuum cabinet accommodating 21 trays enabling about a ton of material to be dried per batch. The movable heating plates, arranged in such a manner as to maintain good thermal contact with foodstuff undergoing dehydration, are responsible, more than any other feature of the plant, for the successful drying of meat steaks, fish fillets, sliced root vegetables and certain whole fruit

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060806

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractA method is described for the colorimetric analysis of residues ofp‐chlorobenzylp‐chlorophenyl sulphide on leaf and fruit samples and in animal tissue. The method is based on pre‐oxidation of the spray residues followed by intensive nitration of the resultingp‐chlorobenzylp‐chlorophenyl sulphone, and the formation of a purple colour on interaction of the nitrated products in benzene with sodium methylate.The method is sensitive to 0.05 mg. and is specific in the presence of all likely contaminants e

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060807

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractThe oxidation‐reduction potential of thesterno‐cephalicusmuscle of the horse falls after death fromEH>+ 250 mv to about −130 mv. The greatest change takes place immediately after death and is probably due to the withdrawal of the last traces of oxygen from the tissues. Afterrigor mortisthe potential remains steady, provided that bacterial growth is inhibited, which can be effected either by holding the muscle at 5° or incorporating 1‐2 p.p.m. of aureomycin. If bacterial growth occurs the potential falls to aboutEH−250 m

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060808

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractThe amino‐acids of alcoholic extracts of lucerne hay cut in different stages of growth and mature grass and legume hays are estimated quantitatively by a rapid approximate paper chromatographic method. It is found that the amino‐acids of the lucerne cut in varying stages of growth decline in quantity with increasing age, although some of the amino‐acids form a fairly constant percentage of the total nitrogen at each stage. Differences in asparagine‐aspartic acid content of lucerne hay from two different sources, as well as those of glycine, serine, alanine and proline, caused by manuring, are noted. Certain family amino‐acid differences are observed among the mature hays. The alcoholic extracts of fenugreek seeds are found to contain few free amino‐acids; other acids exist in peptide

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060809

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY

摘要:

AbstractThe seed oils of the speciesBombax sessileandLupinus termishave been examined in detail and their fatty acid composition determined. The former has a composition closely resembling that of palm oil, while the latter resembles other members of the Papilionaceae in that it contains minor quantities of linolenic acid and also of higher saturated fatty acids.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740060810

出版商:John Wiley&Sons, Ltd    

年代:1955

数据来源: WILEY