F region

Eighty-three strains of Newcastle disease virus ( NDV) were isolated from cases during epidemic in different parts of China in 2005.The main functional region of the F gene were amplified by RT-PCR and sequenced.

采用2005年从国内不同地区、不同宿主分离到的NDV分离株，选取其中具有代表性的83株，用RT-PCR技术扩增其F基因重要的功能区片段，进一步进行序列测定。

A Spherical Mirror F-P Interferometer in Submillimeter Wave Region

亚毫米波球面镜F-P干涉仪

In this paper, features of the total electron content and F-region of the ionosphere over the Pacific area during the typical storms are analysed on the basis of published data and some new results are presented.

本文在前人已公布的暴时电离层动态资料的基础上，进行了太平洋地区冬至与夏至期间电子总量和F层特征的分析研究，取得了新的结果。

The glass forming region in the ( Mg _ ( 0.25 ) Ca _ ( 0.25 ) Sr _ ( 0.25 ) Ba _ ( 0.25 )) F _ 2-AlF _ 3-YF _ 3 system has been determined by quenching melts.

用熔体淬冷法确定了 ( Mg_ ( 0.25 ) Ca_ ( 0.25 ) Sr_ ( 0.25 ) Ba_ ( 0.25 ) )F_2-AlF_3-YF_3系统的玻璃形成区.

The distribution characteristic of auroral electrojet in AZS, is helpful for the studies of F layer and magnetosphere coupling in polar region and aurora dynamics.

了解了极光电集流在南极中山站的分布特征，有利于极区电离层和磁层耦合及极光动力学的研究。