Maturity, spawning and fecundity of Saurida tumbil (Bloch, 1795) from Mumbai waters

The absolute fecundity of Saurida tumbil ranged between 24160 to 172000 eggs with weight range of 230-670 g. Linear relationship between fecundity and weight was more valid than that of length and ovary weight. The fish breed once a year during November to March. The length at which 50% of the females mature was calculated as 296 mm. The female dominated the commercial catch and overall male to female ratio of population was 1:1.62 throughout the year.

Larval and postlarval development of the window-pane shell, Placuna placenta L. (Bivalvia: Placunidae)

Stages of development of P. placenta from the straight-hinge veliger to the adult are described. Mature larvae metamorphose at lengths from 220-230 m. Larvae probably attach byssally to the water surface at metamorphosis and remain in the plankton for some time before finally settling on the mud bottom.

猴艾滋病病毒(SRV)的装配及释放与细胞内骨架系统关系的电镜观察

SRV-1病毒核壳体的装配是在细胞核附近的胞质中进行的,其“装配中心”是结合在胞质骨架的中间纤维上,正在装配的和已装配好的病毒核壳体都是紧密结合在中间纤维上的。而在核内骨架系统中未观察到病毒粒子。

石榴裂果发生规律及其防治对策研究

石榴裂果是云南蒙自石榴生产中的突出问题 ;从幼果期至成熟果期均会发生裂果。一般果园裂果率为 2 0 %～2 5 % ,严重的果园达 5 0 %～ 70 % ,造成严重经济损失。在掌握其发生规律的基础上 ,采取春初施足农家肥 ,花期至幼果期每间隔 7～ 10d灌水 1次 ;幼果期至果实膨长期适当控水 ,每间隔 10～ 15d灌水 1次 ;临近雨季前 1个月逐增浇灌水频率 ,每间隔 7～ 10d灌水 1次 ,并以少量多次施肥。缓解前期干旱、气候干燥和与后期雨季连续降雨、果园高湿矛盾 ,增强果皮活性、韧性和抗性 ,控制好主要病虫害。裂果率由原来的 2 0 %～ 2 5 %降为现 2 .5 %～ 3.7%。

云南省玉龙雪山自然保护区鸟类资源调查

2007年9～11月和2008年4～5月,对云南省丽江玉龙雪山自然保护区的鸟类资源进行了调查,共记录鸟类184种,结合中国科学院昆明动物研究所鸟类标本室收藏的该地区标本和文献记录的种类,保护区内共记录鸟类330种(另13亚种),隶属47科(另4亚科),18目,占云南省所录鸟类种数848种的38.92%,全国鸟类种数1329种的24.83%。其中国家一级保护物种1种,二级保护物种29种。黑眉长尾山雀Aegithalos iouschistos和大嘴乌鸦Corvus macrorhynchos为保护区内的优势种类。保护区记录的鸟类有留鸟230种和亚种,占所录鸟类种和亚种数的67.05%。区系成分以东洋界物种为主,有182种,占繁殖鸟类总种数的66.42%。亚区级区系分析表明保护区的鸟类以西南山地亚区的种类为主。结合该区鸟类生境分布的特点,提出云南松高山松林、针阔混交林和寒温性暗针叶林的保护是保护工作的重点。

Exposure to chronic constant light impairs spatial memory and influences long-term depression in rats

Exposure to chronic constant light (CCL) influences circadian rhythms and evokes stress. Since hippocampus is sensitive to stress, which facilitates long-term depression (LTD) in the hippocampal CA1 area, we examined whether CCL exposure influenced hippoc

Two new species of the sisorid genus Oreoglanis Smith from Yunnan, China (Teleostei : Sisoridae)

Two new species of the genus Oreoglanis, O. jingdongensis and O. immaculatus are described from the Mekong and Salween River basins, respectively, of Yunnan Province, China. Oreoglanis jingdongensis can be distinguished from other Oreoglanis species by th