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   

Ballistic missile defense: cost of space-based laser     

Hoffert MI  Miller G 《Science (New York, N.Y.)》1986,234(4780):1057-1060

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Equine laryngeal hemiplegia. Part III. A teased fibre study of peripheral nerves     

Cahill JI  Goulden BE 《New Zealand veterinary journal》1986,34(11):181-185

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Equine laryngeal hemiplegia. Part V. Central nervous system pathology     

Cahill JI  Goulden BE 《New Zealand veterinary journal》1986,34(11):191-193

Evidence of long central nerve fibre degeneration (axonal spheroids) in the lateral cuneate nuclei was found in all eight Thoroughbreds affected clinically and subclinically with equine laryngeal hemiplegia, but in only one of six control animals. It was considered that these spheroids may signify a central nervous component of the disease process of laryngeal hemiplegia although until further investigations are performed no firm conclusions regarding the relationship of these findings with laryngeal hemiplegia could be made. Examination of the left and right nucleus ambiguus of clinical and subclinical laryngeal hemiplegic horses revealed no pathological alterations.  相似文献   

Porcine parvovirus infection in a commercial piggery     

Hampson DJ  Moller K  Robertson ID  Fu ZF 《New Zealand veterinary journal》1986,34(5):74

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The concept of vector in parasitology, ecology of agents, epidemiology and epizootology     

E I Korenberg  V N Kryuchechnikov 《Folia parasitologica》1986,33(3):241-248

The concepts of "host" and "vector" are compared in application to arthropods which are capable to transmit pathogens to man and animals. The paper shows that these concepts are not identical. The function of such arthropods as hosts of microorganisms, as well as their possible importance in population ecology, epidemiology and epizootology are discussed. The system of different concepts corresponding to the tasks of these scientific disciplines is also considered.  相似文献   

Recurring origins of allopolyploid species in asplenium     

Werth CR  Guttman SI  Eshbaugh WH 《Science (New York, N.Y.)》1985,228(4700):731-733

A large proportion of plant species has originated through allopolyploidy: interspecific hybridization followed by chromosome doubling. Heterozygosity remains fixed in allopolyploids because of nonsegregation of parental chromosomes. Two allotetraploid species of the fern genus Asplenium show allozyme polymorphisms at loci that are polymorphic in their diploid progenitors, indicating that each has originated more than once and implicating continued gene flow from diploids to tetraploids.  相似文献   

Stable carbon isotope ratios of rock varnish organic matter: a new paleoenvironmental indicator     

Dorn RI  Deniro MJ 《Science (New York, N.Y.)》1985,227(4693):1472-1474

Stable carbon isotope ratios of organic matter in rock varnishes of Holocene age from western North America and the Middle East show a strong association with the environment. This isotopic variability reflects the abundance of plants with different photosynthetic pathways in adjacent vegetation. Analyses of different layers of varnish on late Pleistocene desert landforms indicate that the carbon isotopic composition of varnish organic matter is a paleoenvironmental indicator.  相似文献   

A review and some observations on stringhalt     

Cahill JI  Goulden BE  Pearce HG 《New Zealand veterinary journal》1985,33(7):101-104

A review of the literature on stringhalt in horses is presented, including the aetiology, clinical signs, pathology and treatment of this disease. Three New Zealand outbreaks of stringhalt are reported and discussed. The occurrence of these (and most previously reported outbreaks) in the late summer and autumn, and the association of the disease with various weeds, indicates a likely toxic aetiology.  相似文献   

Comparison of the indirect enzyme-linked immunosorbent assay (ELISA) with the complement fixation test (CFT) for the serodiagnosis of bovine brucellosis     

Hobbs IF 《New Zealand veterinary journal》1985,33(7):112-116

Complement fixation and ELISA tests were carried out on 8772 bovine sera. Results showed that ELISA titres were, on average, approximately sixteen times higher than the corresponding C.F. titres. The specificity of ELISA appeared comparable to that of the C.F.T. There was no evidence to show that the ELISA could detect infection earlier than the C.F.T.  相似文献