Pattern of resting site of sables in Daxing’an Mountains

The use of resting sites of sables (Martes zibellina) was studied by radio-tracking techniques in Daxing’an Mountains in 1994-1996. The results showed that the males used 191 different resting sites, while females used 159 sites averagely in a year. The number of used resting sites varied among seasons, and the reuse index calculated for each individual in each season varied from 0.07 to 0.94. The reuse index was highest for males in autumn-winter. In spring the number of resting sites of females was significantly less than that of males. In summer, both sexes used more resting sites. In winter, the reuse index was negative related to snow depth. The average distance between consecutively used resting sites differed significantly between males (716 m, SD=479, n=1 081) and females (455 m, SD=298, t=-8.59, P<0.001). For males the average distance was the shortest in February-March and the longest in August-September, whereas the shortest distance was recorded in April-May for females. In spring and autumn-winter, most individuals used resting sites that randomly distribute in their home ranges. The standardized Morisita coefficient of resting site dispersion in the home range varied from 0.06 to 0.50. In summer, the standardized Morisita coefficient of resting site dispersion in the home range varied from 0.38 to 0.51. Furthermore, in summer, 72% of all resting sites used by sables were located near the edges of their home ranges.     

山东羊肚菌的分布及生态

笔者在1993年对山东省进行食、药用真菌资源的调查中,首次发现山东也有羊肚菌。为了加速羊肚菌资源的开发利用,现将种类、分布及生态特性简报如下: (一)种类和分布 羊肚菌在山东省分布范围较广,种类有美味羊肚菌(Morchella esculenta)、粗腿羊、肚菌(Morchella crassipes)和小羊肚菌(Morchelladeliciosa),其中以羊肚菌和粗腿羊肚菌数量比较多。主要分布在沂蒙和鲁中的山区,又以沂源、沂水、临朐、安丘、五莲、莒县、沂南、蒙阴、平邑、费县、莱芜等地数量较多,其周围的县、市亦有分布。     

磷脂酰胆碱对小鼠耐力影响的实验研究

近些年来,脂类物质对生物体众多生理机能的积极作用引起人们的极大关注,其中磷脂酰胆碱(phosphatidyl choline,PC)在增强脑部活力,延缓细胞衰老、提高机体耐力方面显示出突出作用。本研究利用我们实验室提取精制的磷脂酰胆碱,以小鼠为实验动物,通过饲喂实验,对其耐缺氧效应和抗疲劳能力进行了比较分析,结果表明：磷脂酰胆碱能明显提高小鼠的耐缺氧能力及抗疲劳能力,为进一步研究磷脂酰胆碱提高人体运动及保健机能提供了依据,现将结果报道如下。     

耐碱性木聚糖酶高产菌的分离、鉴定及其酶学性质的研究

从造纸废液中筛选得到一株耐用性木聚糖酶高产菌,经初步鉴定为类黄假单胞菌,其木聚糖酶活力达３８７ＩＵ／ｍＬ培养基。酶学性质的初步研究表明：酶作用最适温度为６０℃,６５℃和７０℃时的半衰期分别为１０５和１０ｍｉｎ,该日作用最适ｐＨ值为１０．０,酶的ｐＨ值稳定范围在８．０～１０．５之间。     

曲阜孔林不同月份黑线仓鼠睾丸组织变化的比较研究

采用形态解剖和组织切片手段,对世界最大的人造园林－－曲阜孔林中不同月份黑线仓鼠睾丸的形态结构及质量变化进行了观察比较。结果表明：黑线仓鼠睾丸质量和曲细精管直径在不同月份呈规律性变化,且二者存在显著的正相关关系。从生殖生物学角度探讨了黑线仓鼠睾丸组织随月份变化的规律。     

银杏茎段组织培养试验

银杏(Ginkgo biloba L)又名白果,是现存种子植物中最古老的子遗植物,素有"活化石”之称,全身是宝.但由于银杏是雌雄异株,种子小,产量低,有后熟期,不耐贮藏[1],用种子进行繁殖非常困难.王伏雄、罗紫娟、吴元立等[2～4]等利用组织培养获得银杏的完整植物,为银杏的快速繁殖开辟了新途径.笔者以带芽的幼嫩枝条和新生的叶片为材料,在多种培养基上进行培养,为快速繁育银杏探讨新的途径.     

水稻株高基因及其在育种上的应用

株高是水稻品种的重要农艺性状之一,直接影响水稻品种的丰产潜力和抗倒伏性能。近年来,随着研究手段的改进和水平的提高,越来越多的水稻株高基因被发现、定位和克隆。本文综述了国内外在该领域的研究进展,同时阐述了水稻株高基因在育种上的应用概况,并对其发展前景进行了展望。