Polymorphism of the CD4 and CD5 differentiation antigens in cattle.     

W I Morrison  C J Howard  C A Hinson 《Veterinary immunology and immunopathology》1991,27(1-3):235-238

Monoclonal antibodies (mAbs) specific for bovine CD4 and CD5 antigens have been found to identify polymorphic determinants on these molecules. In the case of CD5, mAb IL-A67 recognises one allotypic form of the antigen while four other CD5-specific mAbs in the workshop (CC17, CC29, BLT-1 and 8C11) recognise a second allotype. The CD4-specific mAbs submitted to the workshop reacted with the cells of all animals tested. However, a further two mAbs (CC26 and IL-A18) specific for CD4 were found to react with cells only from about 85% of animals tested. Sequential immuno-precipitation experiments together with family studies showed that the allotypes of CD4 and CD5 are both inherited in a simple Mendelian manner and are co-dominantly expressed. One of the CD5 allotypes was not detected in Bos taurus animals while the gene frequency of the second allotype was only about 10% in the B. indicus animals tested. The gene frequency of the CD4 allotype detected by CC26 and IL-A18 was similar in the two sub-species.  相似文献   

A mathematical programming model of a crop-livestock farm system     

David A. Morrison  Ross S. Kingwell  David J. Pannell  Michael A. Ewing 《Agricultural Systems》1986,20(4):243-268

A whole-farm mathematical programming model has been built for dryland crop-livestock farms in Western Australia. The multidisciplinary approach used for model building is presented and the resulting model structure is described. It is a mixed integer programming model which represents, in some detail, the biological, technological and financial relationships of the farming system and stresses the interdependencies of enterprises. The model is used to investigate the extent to which positive interactions between different enterprises influence the optimal farm plan. The management issue considered is the division of land between crop and pasture production. It is concluded that, for the farming system considered, interactions do have an influence on profit and the optimal farm plan.  相似文献   

Comparative Study of Four Techniques for Evaluation of Sperm Quality in Ovine and Bovine Frozen-thawed Samples     

LJ Pérez  A Valcárcel  MA de las  Heras H Baldassarre 《Reproduction in domestic animals》1997,32(3):157-160

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Applying spatial analysis to a porcine reproductive and respiratory syndrome regional control programme     

Mondaca-Fernández E  Morrison RB 《The Veterinary record》2007,161(4):137-138

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Employment     

Philip S. Morrison 《Asia Pacific viewpoint》2001,42(1):85-106

The 1990s began with unprecedented market conditions for labour: unemployment rates were reaching their highest level in over 50 years, participation in the labour market had fallen to historically low levels and net emigration was widespread across all occupations. It seemed that things could only get better. While some did benefit from the limited growth that took place in the nineties, many did not. The greater inequality generated during the 1980s was fanned by the deregulation of the labour market and remained undiminished throughout the following decade. The marked reduction in manufacturing employment in the 1980s continued into the early 1990s negatively impacting Maori and Pacific Island men and women in particular. Increasingly post‐secondary school education became necessary to gain entry into regular work and those with little formal education and few work skills fell further down the queue. These changes are closely allied to the processes of globalisation which is already exercising considerable influence on the employment opportunities of New Zealanders.  相似文献   

Development New Zealand     

Philip S. Morrison 《Asia Pacific viewpoint》1984,25(1):77-86

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The Conceptual Triad: Capital,Labour and the Region Alan J. Scott and Michael Storper (eds), Production,Work, Territory. The Geographical Anatomy of Industrial Capitalism,Allen & Unwin,Winchester, Mass, 1986, NZ$49.00, Pp. 344.     

Philip S. Morrison 《Asia Pacific viewpoint》1987,28(2):160-170

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Long-term chemical and biological trends in Scottish streams and lochs     

R. Harriman  B. R. S. Morrison  H. J. B. Birks  A. E. G. Christie  P. Collen  A. W. Wattb 《Water, air, and soil pollution》1995,85(2):701-706

Between 1975 and 1985 several catchments in Scotland were established as reference sites to determine short-term (hours, days, weeks) and long-term (years, decades) changes in major physical, chemical and biological variables. The initial selection criteria included catchment size, land-use and deposition loading. Changes in fish status of lochs were determined by systematic netting while quantitative estimates of fish populations were made at stream sites. Egg survival and year class distribution assisted interpretation. Historical changes in pH based on stratigraphical changes in diatom assemblages are compared with recent measured changes which have occurred during the past 20 years when SO₂ emissions declined. Significant chemical and biological trends due to changes in pollutant loading are best detected in sensitive lochs which are unmanaged and with low organic content and acid neutralising capacity (ANC) close to zero. Significant trends are less apparent in lochs with managed (forested) catchments. Many stream sites also reveal long-term improvements in pH, sulphate (SO₄) Alkalinity (Alk) etc, but the significance of these trends is much less because of the greater inherent chemical variability. Stream sites close to ANC=0 provide the most wide-ranging evidence of ecological change, ie, increase in Alk, decrease in SO₄ and increase in numbers of juvenile salmonids. Measured chemical changes are compared with predicted estimates, based on critical load calculations and problems in interpretation are discussed.  相似文献   

Venus: absence of a phase effect at a 2-centimeter wavelength     

Morrison D 《Science (New York, N.Y.)》1969,163(3869):815-817

Observations of Venus made during 1967 and 1968 at a frequency of 15.4 gigahertz set an upper limits of 5 percent for the variation of brightness temperature with phase. This negative result appears to contradict earlier detections of a phase effect. By comparison with Virg A (3C 274), which has an assumed flux density of 29 x 10(-26) watt per square meter per hertz, the brightness temperature of Venus at this frequency is 485 + 60, -40 degrees K (mean error).  相似文献   

Longitudinal studies of effects of divorce on children in Great Britain and the United States   总被引：11，自引：0，他引：11  

A J Cherlin  F F Furstenberg  L Chase-Lansdale  K E Kiernan  P K Robins  D R Morrison  J O Teitler 《Science (New York, N.Y.)》1991,252(5011):1386-1389

National, longitudinal surveys from Great Britain and the United States were used to investigate the effects of divorce on children. In both studies, a subsample of children who were in two-parent families during the initial interview (at age 7 in the British data and at ages 7 to 11 in the U.S. data) were followed through the next interview (at age 11 and ages 11 to 16, respectively). At both time points in the British data, parents and teachers independently rated the children's behavior problems, and the children were given reading and mathematics achievement tests. At both time points in the U.S. data, parents rated the children's behavior problems. Children whose parents divorced or separated between the two time points were compared to children whose families remained intact. For boys, the apparent effect of separation or divorce on behavior problems and achievement at the later time point was sharply reduced by considering behavior problems, achievement levels, and family difficulties that were present at the earlier time point, before any of the families had broken up. For girls, the reduction in the apparent effect of divorce occurred to a lesser but still noticeable extent once preexisting conditions were considered.  相似文献