中朝板块北缘志留纪海岛的发现

在内蒙古达尔罕茂明安联合旗北部巴特敖包地区发现了志留纪的海岸带及其底栖无脊椎动物化石（层孔虫、日射与床板珊瑚等）,证实当时该地发育一个位于中朝古板块北缘大陆棚上的小海岛,将其命名为巴特岛．该岛的基部由奥陶纪火成岩组成,长、短轴分别为６１０和２００ｍ,现今呈北东－南西向延伸．志留纪罗德洛世（距今约４２０Ｍａ）的地层围绕该岛分布,产状向四周倾状．巴特岛的南缘（背风）发育皮壳状生物,栖息在火成岩顶面并被     

Fourier analysis of vertebral shape change due to growth and selection for large and small body size

Summary Fourier analysis of videodigitised outlines of mouse vertebrae from two stocks, a pseudo-longitudinal series of mice aged 25–60 days and one selected for large or small body size over many generations shows that the shape changes due to normal growth are not similar to those produced by selection for body size.     

试论防火墙技术

随着Intemet的迅猛发展，安全性已成为网络互联技术中的关键问题．文章全面论述了网络防火墙安全技术和产品的分类及主要技术特征．同时简要描述了传统网络防火墙存在的不足和未来防火墙技术的发展趋势。     

高阶AKNS方程的对合解

本文在文献［１］的基础上，借助可换流的对合解，给出高阶ＡＫＮＳ方程的对合解。     

Magnetic resonance microscopy: in vivo sectioning of a developing insect

Summary The utility of magnetic resonance imaging vis-a-vis insect morphology and development was investigated. MRI is a noninvasive technique that distinguishes between tissues based on proton content and proton environment. At present a resolution of 100 m is achievable. The technique avoids fixation artifacts and allows the detection of motion within the organism.     

Light is a dominant mouse mutation resulting in premature cell death.

Light is a dominant mutant allele of the mouse brown locus which results in hairs pigmented only at their tips. The phenotype is due to premature melanocyte death. We have sequenced the tyrosinase-related protein-1 cDNA encoded at this locus from Light mice and found that it contains a single base alteration from wild-type, causing an Arg to Cys change in the protein. To further elucidate the mutant phenotype, we studied the expression of melanocyte specific genes in the skin of Light mice. We have demonstrated premature melanocyte death, but only in pigmented mice, indicating that the cell death is mediated through the inherent cytotoxicity of pigment production.     

高职机械类专业“人字型”人才培养模式探索

对高职教育人才培养模式进行研究,提出高职院校机械类专业"人字型"人才培养模式,该模式突出了专业特点,以就业为导向,紧密贴近生产实践,在培养应用型人才中更有成效。     

Herbivorous and parasitic insect guilds associated with Great Basin wildrye ( Elymus cinereus ) in southern Idaho

Insects inhabiting Great Basin wildrye ( Elymus cinereus Scribn. & Merr.) were surveyed at two sites on the Snake River Plain in southern Idaho during 1982 and 1983. Forty-six species of phytophagous insects were observed. In addition, eight parasitoid species were reared from insect hosts in the plant culms and identified. Lifestage, abundance, plant part utilized, and study site were recorded for each insect species collected. Insect guilds at the two sites were compared based on species presence utilizing Sorensen's similarity index. Overall, 26 insect species were common to both sites, yielding a moderate similarity index of 0.62. The majority of the species that constitute the wildrye herbivore guilds were oligophagous (restricted to grasses). Many of these insects feed on grain crops as well as other native and introduced grasses. The relatively high diversity of phytophages on wildrye may be due to its tall, bunchgrass growth form, its abundance within its habitat, its broad geographic range, and the large number of related species of grasses in the region.     

Notes on the genus Bombylius Linnaeus in Utah, with key and descriptions of new species (Diptera: Bombyliidae)

A key to the Utah species of Bombylius is presented. Bombylius heximaculatus, nigriventris, montanus, abdominalis, aestivus, and auriferoides, new species, and lancifer kanabensis, subspecies new, are described from Utah. Bombylius lassenensis, new name, is proposed to replace the preoccupied B. pallescens Johnson and Maughan.