Pioneer laboratories:willis R. Whitney, general electric, and the origins of u.s. Industrial research and the making of american industrial research     

Brittain JE 《Science (New York, N.Y.)》1986,232(4758):1651

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The tunneling microscope: a new look at the atomic world     

Golovchenko JA 《Science (New York, N.Y.)》1986,232(4746):48-53

A new instrument called the tunneling microscope has recently been developed that is capable of generating real-space images of surfaces showing atomic structure. These images offer a new view of matter on an atomic scale. The current capabilities and limitations and the physics involved in the technique are discussed along with specific results from a study of silicon crystal surfaces.  相似文献   

Challenges for the u.s.s.R: technical progress and soviet economic development     

Hardt JP 《Science (New York, N.Y.)》1986,234(4782):1446

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Transplanted neurons: neural transplantation and regeneration     

McLoon LK 《Science (New York, N.Y.)》1986,232(4752):892

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Teleological cosmology: the anthropic cosmological principle     

Silk J 《Science (New York, N.Y.)》1986,232(4753):1036-1037

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GAO Blasts Bigeye Chemical Weapon: A new study says that technical problems and inconsistencies in test results indicate that the bomb should not be produced     

Smith RJ 《Science (New York, N.Y.)》1986,232(4757):1493-1494

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Inquiry Faults Shuttle Management: Rogers Commission calls for sweeping reforms in NASA's operations, as well as substantial changes in the design of the solid-rocket seals     

Smith RJ 《Science (New York, N.Y.)》1986,232(4757):1488-1489

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Famine Early Warning Closer to Reality: Chronic lag in response to food emergencies in Africa spurs use of remote sensing to improve reaction time     

Walsh J 《Science (New York, N.Y.)》1986,233(4769):1145-1147

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Molecular transformations on single crystal metal surfaces     

Madix RJ 《Science (New York, N.Y.)》1986,233(4769):1159-1166

One of the primary objectives of modern surface chemistry of transition metals is the synthesis of surface compounds and complexes and the understanding of their reactivity, structure, and bonding. Such considerations are paramount for advancing understanding of catalysis, adhesion, organic thin-film growth, and electrocatalysis. On selected metals, particularly copper, silver, and gold, selective scission of X-H bonds (where X is oxygen, carbon, nitrogen, or sulfur) by surface-bound atomic oxygen occurs to form moderately stable species that can be isolated for further study. Selective oxidation reactions may occur heterogeneously by means of this novel oxygen- activated route. Furthermore, this selective chemistry offers a paradigm for synthesis of a wide variety of surface organometallic complexes, whose formation can be predicted from acid-base principles. These subjects are discussed in this article with emphasis on their role in catalytic oxidation cycles.  相似文献   

Phalangeal and navicular bone hypoplasia and hoof malformation in the hind limbs of a foal          下载免费PDF全文

Smith DR  Leach DH  Bell RJ 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(1):28-30,31-34

Anatomical anomalies in the hind feet of a seven month old Appaloosa foal were identified and investigated through the use of gross anatomical dissection, radiography and angiography. Abnormalities were restricted to the distal aspect of both hind legs, the right hind leg being more severely affected. Anatomically the right foot resembled that of an equine fetus of approximately 120 days gestational age. Disruption of vascular perfusion to hoof structures was evident in both hind legs and was related to areas of abnormal bone conformation as well as to areas of abnormal ossification and calcification. Phalangeal and navicular bone hypoplasia were apparent as were soft tissue and joint anomalies. Although the etiology of the defects identified remains obscure, several theories are suggested, namely heritability, acquired defects and the possible teratogenic effects of clenbuterol.  相似文献