ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02454.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

A rapid enzyme‐linked immunosorbent assay (ELISA) for the detection of penicillin G in milk at concentrations of 6 ng/ml (0.01 IU/ml) was used to screen 1651 off‐farm milk samples previously reported as containing no detectable levels of antimicrobial substances. Using a single‐well per test format and a percent inhibition cut‐off for the determination of positive/negative endpoint, 3.1% positives were obtained. Comparison with intra‐assay standards lowered the numbers of positives to 0.42%. Analysis of 170 milk samples positive for antimicrobials confirmed 92.4% as containing penicillin G using the prescribed cut‐off level and 87.6% when compared to standards. The ELISA, now available commercially in kit form, analyses between 1 and 48 samples in 15 minutes. It will detect 0.01 IU/ml to a level of confidence of 99% and 0.005 IU/ml with between 75 and 95%

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02455.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02456.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

The hydration related properties of sodium casemate, conventional casein‐whey protein co‐precipitate preparedfrom milk heatedat 90°C × 15 min at pH 6.6 and milk protein isolates prepared from milk heated at 90°C × 15 min at pH 7.5 or at 60°C × 3 min at pH 10.0 were determined. Conventional acid‐precipitated casein and the acid‐precipitated protein isolates preparedfrom milks heated at pH>7.0 had similar solubilities and reconstitution properties which were better than those of a conventional co‐precipitate. Water sorption isotherms for all the proteins were similar. Viscosities followed the order: conventional co‐precipitate>milk protein isolates

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02457.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02458.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02459.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02460.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02461.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY

摘要:

An Economic History of Agriculture in Northern Ireland:1850–1900. By D L Armstron

ISSN:1364-727X    

DOI:10.1111/j.1471-0307.1990.tb02462.x

出版商:Blackwell Publishing Ltd    

年代:1990

数据来源: WILEY