Dynamic properties of molecularly thin liquid films     

Israelachvili JN  McGuiggan PM  Homola AM 《Science (New York, N.Y.)》1988,240(4849):189-191

An experimental technique is described for simultaneously measuring the static and dynamic interactions of very thin liquid films between two surfaces as they are moved normally or laterally relative to each other. Film thickness can be measured and controlled to 1 angstrom. Initial results are presented of the transition in the physical properties of liquid films only one molecular layer thick to thicker films whose properties are practically indistinguishable from the bulk. In particular, the results show that two molecularly smooth surfaces, when close together in simple liquids, slide (shear) past each other while separated by a discrete number of molecular layers, and that the frictional force is "quantized" with the number of layers.  相似文献   

Infertility in a ram associated with a knobbed acrosome abnormality of the spermatozoa   总被引：1，自引：1，他引：0       下载免费PDF全文

Savage NC 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(3):126-127

A yearling Rambouillet ram with an asymmetrical scrotum was examined for potential breeding soundness prior to use in a synchronized mating program in a purebred flock of 20 ewes. Initial sperm cell evaluation revealed 78% knobbed acrosomes associated with few other abnormalities of the head and midpiece. Use of the ram resulted in no conception in one group of ten synchronized ewes. One month later, the proportion of sperm cells with knobbed acrosomes was 80%.  相似文献   

Les différentes bandes de contention utilisées pour la confection de prothèses externes chez les petits animaux          下载免费PDF全文

Bonneau NH  Olivieri M 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(5):199-200

Retrospective evaluation of xylazine/halothane anesthesia in 125 cattle          下载免费PDF全文

Adetunji A  Pascoe PJ  McDonell WN  Horney FD 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(9):342-346

A retrospective morbidity and mortality study was carried out on 125 case records of cattle involving xylazine/halothane anesthesia at the Ontario Veterinary College, Guelph between May 1979 and February 1983.  相似文献   

Un ostéosarcome de la diaphyse du fémur d'un chien, associé à un implant métallique          下载免费PDF全文

Breton L  Bonneau NH  Beauregard M 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(11):426-428

The hymenopterous parasites of Nitidulidae     

Roger N. Williams  Michael J. Weiss  M. Kehat  D. Blumberg 《Phytoparasitica》1984,12(1):53-64

The known information on hymenopterous parasites of Nitidulidae was consolidated in this article. Species of parasites, nitidulid hosts and, where possible, plant host of the nitidulids are provided along with citations to sources of information. Thirty-three species of hymenopterous parasites are recorded in nine different families. Since nomenclature of several of the parasites has changed, it was updated with the assistance of specialists.  相似文献   

Hypocalcaemia associated with high dose rates of zinc oxide to lactating dairy cows     

Smith BL  Collier AJ  Lawrence RJ  Towers NR 《New Zealand veterinary journal》1984,32(4):48-50

Clinical hypocalcaemia was associated with single doses of three oi more days; supply of zinc oxide to dairy cows for facial eczema control. Experimental hand dosing of a single dose of zinc oxide (40 and 120 mg Zn/kg b wt) to Jersey cows caused a significant drop in serum calcium concentration at 24 h followed by a rise to concentrations higher than controls at subsequent samplings over four days. At the highest zinc dose rate, 78% of serum calcium values were equal to or lower than the lowest control value at 24 h post dosing. Serum magnesium concentrations had a reciprocal relationship to the calcium levels at all samplings. Serum zinc concentrations were most elevated over the 48 h post dosing, returning to normal levels at the fifth day. Following the highest zinc dose milk yields were reduced by approximately 1.5 kg milk/cow/day for 48 h. Similar results were obtained when cows grazed pasture on which large amounts of zinc oxide had been sprayed.  相似文献   

Venus: detailed mapping of maxwell montes region     

Alexandrov YN  Crymov AA  Kotelnikov VA  Petrov GM  Rzhiga ON  Sidorenko AI  Sinilo VP  Zakharov AI  Akim EL  Basilevski AT  Kadnichanski SA  Tjuflin YS 《Science (New York, N.Y.)》1986,231(4743):1271-1273

From October 1983 to July 1984, the north hemisphere of Venus, from latitude 30 degrees to latitude 90 degrees , was mapped by means of the radar imagers and altimeters of the spacecraft Venera 15 and Venera 16. This report presents the results of the radar mapping of the Maxwell Montes region, one of the most interesting features of Venus' surface. A radar mosaic map and contour map have been compiled.  相似文献   

Corynebacterium equi Infections in Horses, 1958-1984: A Review of 131 Cases   总被引：6，自引：0，他引：6       下载免费PDF全文

Zink MC  Yager JA  Smart NL 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(5):213-217

Of 131 cases of Corynebacterium equi infection in horses submitted for necropsy to the Ontario Veterinary College or Veterinary Laboratory Services, OMAF, Guelph, Ontario from 1958 to 1984, 115 were diagnosed as suppurative pneumonia, and of these 55 had associated ulcerative enterocolitis. Only five animals had intestinal involvement without pulmonary lesions. The remaining 11 cases included arthritis/cellulitis, skin abscesses and submandibular lymphadenitis. While the lung, intestine and associated lymph nodes yielded C. equi most frequently, in 21% of cases C. equi was also cultured from parenchymatous organs (spleen, liver or kidney) or blood. Corynebacterium equi infection accounted for 10% of all foals submitted for postmortem examination and 45% of all foals with pneumonia. Affected foals were one to four months of age. Submissions occurred between the months of May and August with a peak during July. There was a significantly greater prevalence of C. equi infection in Standardbreds when compared with other breeds. Of foals in this study, 36% were from farms which had had other horses succumb to this disease. Of the foals with pulmonary involvement, 21% did not have fever or clinical signs referable to the respiratory or gastrointestinal systems, findings which indicated that a large percentage of cases were subclinical.  相似文献   

Massey University purchases Jennersmead Farm from Glaxo (NZ) Ltd     

Bruere AN 《New Zealand veterinary journal》1986,34(4):51

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