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排序方式: 共有470条查询结果,搜索用时 15 毫秒
1.
Effect of temperature on late immature stages of Culicoides brevitarsis (Diptera: Ceratopogonidae). 总被引:1,自引:0,他引:1
P G Allingham 《Journal of medical entomology》1991,28(6):878-881
Fourth-instar larvae of the biting midge, Culicoides brevitarsis Kieffer, were reared to adult in agar medium at temperatures of 20, 26, 30.5, 33, 35.5, 38 and 40 degrees C. Optimum (greater than 80%) survival to adult occurred from 26 to 33 degrees C. Temperatures outside this range disrupted development. Above 35.5 degrees C, all immatures died before completing development. Duration of development from fourth instar to adult was shortest at 30.5 degrees C (4.3 d). The estimated duration of development from egg to adult at 26-33 degrees C was 11-13 d. The increased mortality of immature stages at temperatures greater than 33 degrees C may be significant in the reduction of adult populations during summer in inland areas of the northern Australian tropics, where mean monthly maxima exceed 35 degrees C from October until February. 相似文献
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Hillmann JS; Mesgarzadeh M; Revesz G; Bonakdarpour A; Clancy M; Betz RR 《Radiology》1987,165(3):769-773
Proximal femoral focal deficiency, an uncommon congenital anomaly, necessitates early radiologic classification for surgical planning and treatment. Objective radiographic criteria, including femoral length index, acetabular depth index, acetabular angle index, and shape of the proximal femur were determined in 49 patients before cartilaginous ossification of the femoral capital epiphysis; final classification was based on follow-up radiographs or findings at arthrography or surgery. These parameters were analyzed to determine the accuracy and contributions of each in classification. Correct classification into one of three groups was possible in 86% of cases with use of three of the parameters: femoral length index, acetabular depth index, and shape of the proximal femur. The acetabular angle was found to contribute insignificantly to classification. Magnetic resonance imaging, used in only one case, depicted the nonossified cartilaginous femoral capital epiphysis, thus obviating the need for invasive diagnostic procedures and facilitating early classification. 相似文献
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Life expectancy in British Marfan syndrome populations 总被引:2,自引:0,他引:2
JR Gray AB Bridges RR West L. McLeish AG Stuart JCS Dean MEM Porteous M. Boxer SJ Davies 《Clinical genetics》1998,54(2):124-128
A total of 206 patients with Marfan syndrome were ascertained throughout genetic clinics in Wales and Scotland during the period 1970–1990. There were 45 deaths representing 22% of the cohort. Mean age at death was 45.3 ± 16.5 years. 50% median cumulative survival in the total cohort (n = 206) was 53 years for males and 72 years for females. Multivariate analysis confirmed severity as the best independent indicator of survival. These findings and survival curves will assist in the counselling of British families and individuals with Marfan syndrome. 相似文献
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