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排序方式: 共有97条查询结果,搜索用时 531 毫秒
91.
Evaluation of Cervical Spinal Fusion as a Treatment in the Equine "Wobbler" Syndrome 总被引:1,自引:0,他引:1
PAMELA C. WAGNER D.V.M. M.S. BARRIE D. GRANT D.V.M. M.S. § GEORGE W. BAGBY M.D. M.S. ANTHONY M. GALLINA D.V.M. Ph.D. † RONALD D. SANDE D.V.M. Ph.D. MARC RATZLAFF D.V.M. Ph.D. ‡ 《Veterinary surgery : VS》1979,8(3):84-88
Cervical vertebral interbody fusion was performed on 30 horses affected with cervical vertebral malformation (CVM) or "wobbles" to assess the efficacy of the surgery in either preventing progression of or reversing the neurologic deficit induced by the syndrome. Evaluation of each horse prior to surgery included clinical, radiographic, neurologic, and laboratory examination. Subjects ranged from 3 months to 8 years of age, and included 22 males and 8 females of various breeds. Three normal horses were included as controls. The Cloward method of cervical fusion was used to achieve stabilization at the affected vertebral articulation. Horses were reexamined 3 months after surgery. Clinical improvement was seen in 90% (27 of 30) of the cases. Four horses were returned to training, which had been interrupted by onset of symptoms. Seven were returned to owners as breeding animals. Twelve horses were kept for long-term studies. Seven horses were sacrificed to examine the surgical site. In 6 of the 7 horses on which necropsy was performed, the most severe histologic lesion in the spinal cord could be predicted from lesions seen radiographically. The spinal cords of control animals were normal. Osseous fusion was dependent on the completeness of removal of disc fibrocartilage during surgery. We conclude that clinical improvement in some horses affected with CVM can be achieved by cervical fusion. 相似文献
92.
Research has found that development exactions are capitalized into the price of new housing. As the price of new housing increases, one would expect to see a price rise in existing housing as well, albeit lagged to some extent. This paper presents the results of an empirical study designed to measure how much impact fees affect the price of existing, single-family dwellings. Data for this study were obtained from county property appraiser files provided by the Florida Department of Revenue. The data represent 1,055 new and 3,135 existing home sales, respectively, in Dunedin, Florida, and 7,292 existing home sales in Clearwater, Florida, from 1971-1982. On June 3, 1974, the city of Dunedin began assessing impact fees of $1,150 against all new, single-family construction. The methodology used in this paper examines the price differential of new relative to existing housing and finds that the difference disappeared after six years. 相似文献
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96.
Fullerene pipes 总被引:10,自引:0,他引:10
J Liu AG Rinzler H Dai JH Hafner RK Bradley PJ Boul A Lu T Iverson K Shelimov CB Huffman F Rodriguez-Macias YS Shon TR Lee DT Colbert RE Smalley 《Science (New York, N.Y.)》1998,280(5367):1253-1256
Single-wall fullerene nanotubes were converted from nearly endless, highly tangled ropes into short, open-ended pipes that behave as individual macromolecules. Raw nanotube material was purified in large batches, and the ropes were cut into 100- to 300-nanometer lengths. The resulting pieces formed a stable colloidal suspension in water with the help of surfactants. These suspensions permit a variety of manipulations, such as sorting by length, derivatization, and tethering to gold surfaces. 相似文献
97.
F Hill PB Stark RT Stebbins ER Anderson HM Antia TM Brown TL Duvall DA Haber JW Harvey DH Hathaway R Howe RP Hubbard HP Jones JR Kennedy SG Korzennik AG Kosovichev JW Leibacher KG Libbrecht JA Pintar EJ Rhodes J Schou MJ Thompson S Tomczyk CG Toner R Toussaint WE Williams 《Science (New York, N.Y.)》1996,272(5266):1292-1296
The Global Oscillation Network Group (GONG) project estimates the frequencies, amplitudes, and linewidths of more than 250,000 acoustic resonances of the sun from data sets lasting 36 days. The frequency resolution of a single data set is 0.321 microhertz. For frequencies averaged over the azimuthal order m, the median formal error is 0.044 microhertz, and the associated median fractional error is 1.6 x 10(-5). For a 3-year data set, the fractional error is expected to be 3 x 10(-6). The GONG m-averaged frequency measurements differ from other helioseismic data sets by 0.03 to 0.08 microhertz. The differences arise from a combination of systematic errors, random errors, and possible changes in solar structure. 相似文献