Self-esteem through fantasy     

Koshland DE 《Science (New York, N.Y.)》1993,259(5091):11

  相似文献   

Making wolves lovable     

Koshland DE 《Science (New York, N.Y.)》1993,261(5121):531

  相似文献   

Dutch foundation says it gets it right     

Aldhous P 《Science (New York, N.Y.)》1993,262(5135):839

  相似文献   

Clean thoughts on clean air     

Koshland DE 《Science (New York, N.Y.)》1993,261(5127):1371

  相似文献   

Response     

Abelson PH 《Science (New York, N.Y.)》1993,260(5113):1527-1528

  相似文献   

Subcultures in genetics     

Kohler RE 《Science (New York, N.Y.)》1993,261(5124):1061-1062

  相似文献   

Global competition     

Abelson PH 《Science (New York, N.Y.)》1993,261(5124):967

  相似文献   

Associations between body weight and rectal temperature in turkey poults     

P. E. Waibel  M. G. Macleod 《British poultry science》1993,34(2):417-423

1. Associations between body weight and rectal temperature were observed in female turkeys.

2. Turkeys with lower weights between 13 and 30 d of age tended to have higher temperatures.

3. Turkeys with lower weights at 7 d exhibited depressed body temperatures.

4. Higher or lower body temperatures may be associated with poorer performance depending on the time of appearance.  相似文献   

Comparison of the rates of proliferation of adipocyte precursor cells derived from two lines of chicken which differ in their rates of adipose tissue development     

L. E. Donnelly  A. Cryer  S. C. Butterwith 《British poultry science》1993,34(1):187-193

1. Putative adipocyte precursor cells were isolated from the white adipose tissue of young broiler and layer chickens and cultured in vitro.

2. The cells from both sources were shown to have the characteristics of adipocyte precursor cells. On reaching confluence, lipoprotein lipase activity was induced and the cells from both strains accumulated large amounts of lipid in the presence of chicken serum.

3. Measurement of cell number over time in culture and calculation of cell doubling times showed that cells from broilers proliferated at a faster rate than those derived from layer‐strain chickens. This was the case whether primary or secondary cell cultures were used. Primary cultures of broiler cells had a doubling time of 22 h versus 39 h for layer cells.

4. The contribution of such a difference in proliferative rate to the differential rate of adipose tissue growth between broiler and layer strains observed in vivo is discussed.  相似文献   

Polioencephalomalacia in cattle consuming water with elevated sodium sulfate levels: A herd investigation   总被引：1，自引：1，他引：0       下载免费PDF全文

Hamlen H  Clark E  Janzen E 《The Canadian veterinary journal. La revue veterinaire canadienne》1993,34(3):153-158

Polioencephalomalacia (PEM), hereafter used to refer to the specific lesion of cerebrocortical necrosis, developed in 11 of 110 mature cattle on pasture in central Saskatchewan. The primary water source contained a markedly elevated level of sodium sulfate (7200 ppm). The significant clinical findings of the herd investigation included depression, ataxia, cortical blindness, dysphagia, and death. Diagnosis of PEM was confirmed by histopathological evidence of cerebrocortical and subcortical necrosis with microvascular fibrinoid necrosis predominantly in the thalamic region of three affected cattle. The histopathology of sulfate-associated PEM observed in this herd appears to be unique and its features are presented and discussed. Mean levels for serum transketolase, copper, red blood cell transketolase activity, and thiamine (vitamin B₁) in all exposed young (n = 100) and mature (n = 99) animals did not reveal evidence of deficiencies. Although the blood thiamine status of the seven surviving, affected animals was not evaluated before treatment with exogenous thiamine, 199 members of the herd had blood thiamine levels within the reference range at the time of the outbreak. The outbreak resolved after cattle were moved to a water source containing acceptable levels of sodium sulfate.  相似文献