Racing After the Z Particle: Stanford's electron-positron collider has been plagued with hardware problems that have foiled efforts to begin exploring the physics of the Z particle     

Crawford M 《Science (New York, N.Y.)》1988,241(4869):1031-1032

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Chronic arthritis in goats caused by a retrovirus   总被引：46，自引：0，他引：46  

T B Crawford  D S Adams  W P Cheevers  L C Cork 《Science (New York, N.Y.)》1980,207(4434):997-999

A virus was isolated from an adult goat with chronic arthritis and shown to belong to the retrovirus group by electron microscopy and biochemical methods. Inoculation of the virus into cesarean-derived specific-pathogen-free goats' kids produced arthritic lesions similar to those in the spontaneous disease. Vrus was reisolated from the experimentally induced lesions.  相似文献   

Agricultural Groups Push Research Plan: A proposal for a $500-million competitive grants program at USDA will be unveiled next month with some powerful support     

Crawford M 《Science (New York, N.Y.)》1989,244(4901):140

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Congress's Handiwork on the R&D Budget     

Crawford M 《Science (New York, N.Y.)》1988,239(4842):857

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R&D Lobby Spends NSF's '91 Budget     

Crawford MH 《Science (New York, N.Y.)》1989,246(4937):1564

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Gore seeks to resurrect bioethics commission     

Crawford M 《Science (New York, N.Y.)》1985,228(4707):1515

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William Happer to Be DOE Research Chief?     

Crawford M 《Science (New York, N.Y.)》1990,250(4987):1508

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Budget Crunch Stalls Super Collider: President Reagan's plan for building the world's largest particle accelerator is likely to remain stuck in the R&D phase in 1989 because of limited growth in funding for basic research     

Crawford M 《Science (New York, N.Y.)》1988,240(4848):17-18

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Utilities look to new coal combustion technology     

Crawford M 《Science (New York, N.Y.)》1985,228(4699):565

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Atmospheric trends in methylchloroform and the global average for the hydroxyl radical     

Prinn R  Cunnold D  Rasmussen R  Simmonds P  Alyea F  Crawford A  Fraser P  Rosen R 《Science (New York, N.Y.)》1987,238(4829):945-950

Frequent atmospheric measurements of the anthropogenic compound methylchloroform that were made between 1978 and 1985 indicate that this species is continuing to increase significantly around the world. Reaction with the major atmospheric oxidant, the hydroxyl radical (OH), is the principal sink for this species. The observed mean trends for methylchloroform are 4.8, 5.4, 6.4, and 6.9 percent per year at Aldrigole (Ireland) and Cape Meares (Oregon), Ragged Point (Barbados), Point Matatula (American Samoa), and Cape Grim (Tasmania), respectively, from July 1978 to June 1985. These measured trends, combined with knowledge of industrial emissions, were used in an optimal estimation inversion scheme to deduce a globally averaged methylchloroform atmospheric lifetime of 6.3 (+ 1.2, -0.9) years (1sigma uncertainty) and a globally averaged tropospheric hydroxyl radical concentration of (7.7 +/- 1.4) x 10(5) radicals per cubic centimeter (1sigma uncertainty). These 7 years of gas chromatographic measurements, which comprise about 60,000 individual calibrated real-time air analyses, provide the most accurate estimates yet of the trends and lifetime of methylchloroform and of the global average for tropospheric hydroxyl radical levels. Accurate determination of hydroxyl radical levels is crucial to understanding global atmospheric chemical cycles and trends in the levels of trace gases such as methane.  相似文献