鳗鲡肾胚胎瘤

<正> 近几年,作者在少数养鳗场断续发现一些后肾明显膨大的病鳗鲡,引起了注意。1990年4月在某养鳗场清池的一养鳗池中又获得数尾。经组织切片病理检查为肾胚胎瘤。鱼类肿瘤的研究已有一百来年的历史,国外报道较多,已有数百例,其中肾胚胎瘤仅几例,如Helmboldt和Wyand以及Ashley等。国内也曾报道过一些鱼的肿瘤的个别病例,但迄今还未见鱼类肾胚胎瘤的报道。这次发现的鳗鲡肾胚胎瘤发病率较高,个别池达万分之一以上,为鱼类中罕见,记述如下。

The photon scanning tunneling microscope and its applications

A simple photon scanning tunneling microscope (PSTM) is described. Its lateral resolution (similar to 10nm with a maximal scanning range of 10 mu m x 10 mu m ) is much better than that of a conventional optical microscope. Its principle, the fiber optic tip fabrication and PSTM images of different samples such as mica, HDPE and LiNbO3 are presented.

the trustworthiness metric model of software process quality based-on life circle

Communication University of China; Wuhan University; James Madison University; Institute of Policy and Management, Chinese Academy of Sciences; IEEE Wuhan Section

Environmental Kuznets Curve for SO_2 Emissions in China

This study examines the link between the economic growth and the environmental quality. Based on a panel data set, a N-shaped Environmental Kuzents Curve has been found for the sample period: a cubic relationship between per capita GDP and emissions of sulphur dioxide (SO2). We also find that energy consumption is an important determinant of environmental degradation. The empirical results suggest that we should promote environmental protection as soon as possible.

The Impact of Environmental Non-Tariff Measures on China's Agricultural Exports

This article assesses the impact of environmental non-tariff measures on China's agricultural exports. It uses two measures to show which countries make most intensive use of environmental non-tariff measures and which agricultural products exported by China are the most affected. Environmental non-tariff measures were most prevalence in Malaysia, Vietnam, Philippines, Mexico, Japan, Russian, USA, Germany, and Netherland. Labor-intensive agricultural products, such as fish, vegetables, and fruit were most seriously affected.