Riverine mammals: otters     

Estes JA 《Science (New York, N.Y.)》1986,233(4770):1333-1334

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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   

Book reviews     

P. A. L. Wight  G. C. Perry 《British poultry science》1986,27(3):511-514

Birds Their Structure and Function, By A. S. King and J. McLelland, 1984. 2nd ed. 334 pp. illustrated. London, Baillière Tindall. £9.50. ISBN 0 7020 0872 9.

Proceedings of the 2nd European Symposium on Poultry Welfare, 1985. 360 pp. illustrated. German Branch of the World's Poultry Science Association, Celle, Institut für Kleintierzucht.  相似文献   

Optical experiments and weak interactions     

Bouchiat MA  Pottier L 《Science (New York, N.Y.)》1986,234(4781):1203-1210

Recent optical experiments have demonstrated cases in which mirror symmetry in stable atoms is broken during absorption of light. These results, which are in contradiction with quantum electrodynamics, support the theory of unification of the electromagnetic and weak forces. The interpretation of these experimental results is based on exchanges of weak neutral Z(0) bosons between the electrons and the nucleus of the atom. The information obtained from low-energy experiments is different from, but complementary to, the results of high-energy experiments. Sensitive measurements in a simple, reliably computable atom are in quantitative agreement with the standard electroweak theory and put stringent constraints on alternative models. Attaining sufficient accuracy in the experiments and the computations for the electroweak radiative corrections to manifest themselves is now the challenge for experimenters and theorists.  相似文献   

Changing climate: geothermal evidence from permafrost in the alaskan arctic   总被引：2，自引：0，他引：2  

Lachenbruch AH  Marshall BV 《Science (New York, N.Y.)》1986,234(4777):689-696

Temperature profiles measured in permafrost in northernmost Alaska usually have anomalous curvature in the upper 100 meters or so. When analyzed by heat-conduction theory, the profiles indicate a variable but widespread secular warming of the permafrost surface, generally in the range of 2 to 4 Celsius degrees during the last few decades to a century. Although details of the climatic change cannot be resolved with existing data, there is little doubt of its general magnitude and timing; alternative explanations are limited by the fact that heat transfer in cold permafrost is exclusively by conduction. Since models of greenhouse warming predict climatic change will be greatest in the Arctic and might already be in progress, it is prudent to attempt to understand the rapidly changing thermal regime in this region.  相似文献   

Sinking Slabs Puncture Layered Mantle Model: Seismologists are finding that oceanic plates sinking into the mantle plunge right through the supposedly impenetrable boundary between the upper and lower mantle     

Kerr RA 《Science (New York, N.Y.)》1986,231(4738):548-549

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Black holes--"ingestars"?     

Shurcliff WA 《Science (New York, N.Y.)》1986,231(4744):1355

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Porcine rabies in a closed feeder barn          下载免费PDF全文

Hazlett MJ  Koller MA 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(3):116-118

Rabies was diagnosed in a 40 kg pig from a closed feeder barn in which recently unexplained deaths of eight to ten pigs had occurred. A stray cat, probably crawling through a ventilation duct into the barn, was the suspected vector. Over a four and one-quarter year period a disproportionate 53 cases of animal rabies had been diagnosed within a 5 km radius of the farm (13% of the cases in the county in 3% of the county area). Histological lesions, mostly lymphocytic cuffing of blood vessels in the brain with lymphocytic meningitis, patchy to focal gliosis and satellitosis with neuronal necrosis were nonspecific and Negri bodies were rare. Fluorescent antibody technique examination of the brain for rabies virus antigen was positive.  相似文献   

Improved yersinia isolation from enteric specimens          下载免费PDF全文

Lynch JA 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(3):154

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Ascites in broiler chickens          下载免费PDF全文

Orr JP  Little KS  Schoonderwoerd M  Rehmtulla AJ 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(2):99-100

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