Demographic characteristics of American marten populations in Jackson Hole, Wyoming

Some American marten population characteristics (numbers, density, body weights, sex and age ratios, natality, mortality-survivorship, immigration-emigration, home ranges) were studied at four sites in the southern part of the Greater Yellowstone Ecosystem, Teton County, Wyoming, in 1975-1979. Ninety-eight different martens were examined. Males (n = 25) weighed 1,111 g (± 110 SD, range 875-1,235), whereas females (n = 17) averaged 743 g (± 83 SD, range 600-900). Live-trapping showed sex ratios of 1.5M:1.0F, whereas carcasses showed 3.0M:1.0F. Of 27males that were aged, 12 (44%) were less than 1 year old and 2 were 9-10 years old. Of 10 females, 6 were less than 1 year old and 1 was 12-13 years old. The mean length of time a male was present on the major study area was 144 days (± 266 SD, range 1-1,364), and for females it was 145 days (± 45 SD, range 1-560). Home ranges for six males averaged 3.2 km 2 (± 20 SD, range 0.7-5.8) on the main study area. Some management implications are given.     

重轨表面缺陷机器视觉检测的关键技术

针对重轨生产线中重轨表面缺陷在线检测的困难,提出了基于机器视觉检测的系列关键技术,包括缺陷成像机理、多CCD组合采集器、图像处理技术、基于多空间的缺陷参数提取等.通过图像校正、基于支持向量机(SVM)的直线(面)边缘搜索算法和缺陷特征参数提取等核心技术,可获得完整的重轨全表面的图像,其提纯的缺陷特征参数可以进行模式识别.实验验证表明,采用上述关键技术对重轨表面常见的缺陷识别,正确率在80%以上,达到了工程检测的需要.     

天文大气折射与映射函数的数值模拟

为了研究天文大气折射与中性大气折射延迟之间的内在联系,利用天文大气折射表的表列数据对大气折射延迟的映射函数进行了数值模拟.计算结果表明,用天文大气折射测定值模拟映射函数是可行的;同时也表明,映射函数的形式是次要的,随着连分式项数的增加可以提高模拟的精度.该结论对于改善大气折射数据处理的归算精度,降低仪器的观测截止角,和提高仪器的使用效应具有一定的参考价值和指导意义.     

Surface composition of Hyperion

Hyperion, Saturn's eighth largest icy satellite, is a body of irregular shape in a state of chaotic rotation. The surface is segregated into two distinct units. A spatially dominant high-albedo unit having the strong signature of H2O ice contrasts with a unit that is about a factor of four lower in albedo and is found mostly in the bottoms of cup-like craters. Here we report observations of Hyperion's surface in the ultraviolet and near-infrared spectral regions with two optical remote sensing instruments on the Cassini spacecraft at closest approach during a fly-by on 25-26 September 2005. The close fly-by afforded us the opportunity to obtain separate reflectance spectra of the high- and low-albedo surface components. The low-albedo material has spectral similarities and compositional signatures that link it with the surface of Phoebe and a hemisphere-wide superficial coating on Iapetus.     

Failure of SV40-transformed lizard cells to induce tumors in autogeneic or allogeneic hosts

Summary Lizard cells from the tails of geckos were readily morphologically and antigenically transformed in vitro by SV40 virus. Neither autografts of these cells nor allografts of SV40 transformed gecko embryo cells produced tumors in animals under observation from 1 to 3 years.     

New dopamine receptor stimulant drug

Zusammenfassung Es wird der Nachweis erbracht, dass2(p-nitrobenzylthio)-Imidazolin (3H) · HCl (NBTI) Dopamin-Rezeptoren von Mäusen, Ratten und Affen direkt zu stimulieren vermag.

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The authors wish to thank Dr.G. Ullyot, SKF Laboratories, for gifts of NBTI and chlorpromazine; Dr.H. Corrodi, AB Hässle, Göteborg, Sweden, for the methyl ester hydrochlorides ofl-Dopa,-methyl-p-tyrosine andp-chlorophenylalanine; McNeil Laboratories, Inc., Fort Washington, Pennsylvania, for the haloperidol; and Schering Corporation, Bloomfield New Jersey, for perphenazine. Thanks are also due toA. Schindler for his skillful technical assistance.

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Final paper in press, Eur. J. Pharmac. (1972).