不同温度对双齿多刺蚁养殖及其保护酶系的影响

在不同温度下长期养殖双齿多刺蚁,观察其存活率和活动状况,测定了不同温度对其SOD,POD,CAT活力的影响,并进行了保护酶活性和存活率的相关分析.实验表明,在较低和较高温度下其存活率明显低于10-40℃测定值.在40-45℃时,酶的活性随着温度升高急速下降;在-5-10℃时,酶的活性随着温度降低而下降.保护酶活性和存活率密切相关.10℃以下的低温和40℃以上的高温对其有不同程度的伤害,其适宜温区为10-40℃,最适温度为20-30℃.     

Nickel accumulation and its effects on the survival rate of Spodoptera litura Fabricius under continuous nickel stress

The artificial diets mixed with various concentrations of nickel were offered to the larvae of the phytophagous insect Spodoptera litura Fabricius for 3 generations. Nickel accumulations in the 6th instar larvae, pupae and newly emerged adults of the corresponding generations of S. litura were investigated by Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-AES), and the effects of nickel accumulations on the survival rate of S. litura were also evaluated by individual rearing. The results showed that nickel accumulated in the 6th instar larvae, pupae and adults of S. litura, and the accu- mulated nickel in all the tested developmental stages within a generation increased with the increase of the nickel doses in the treated diets and showed significant dose-dependent relationship with the nickel doses in the artificial diets. The results also indicated that the nickel accumulations in the 6th instar larvae, pupae, and newly emerged adults from the 3rd generation were higher than those from the 2nd generation, which were also higher than those from the 1st generation. Nickel concentrations in pupae and adults were significantly lower than those in larvae, which indicated that the excessive nickel might be excreted during metamorphosis. Furthermore, larval survival rate, pupation rate and eclosion rate of S. litura in the tested three generations all decreased with the increase of the nickel doses in the treated diets.     

缺血性脑血管病与神经细胞凋亡的研究进展

叙述了细胞凋亡概念及神经细胞凋亡的基本特征。细胞凋亡是迟发性神经元死亡的基本形式，细胞凋亡在短暂性局灶性脑缺血、短暂性全脑缺血及永久性脑缺血中随缺血时间再灌注时间的不同，细胞凋亡发生部位及时间、范围亦不相同。     

植物细胞壁中富含甘氨酸的蛋白质

在植物的某些组织中存在富含甘氨酸的蛋白质，根据ＧＲＰｓ中甘氨酸的含量和氨基酸的种类、数目及排列顺序的差异，推测植物的ＧＲＰｓ存在３种类型，这些ＧＲＰｓ在植物的生长发育及植物防御过程中起重要作用，已有大量的ＧＲＰ基因被分离鉴定，并对一些ＧＲＰ基因的启动子进行了分析，ＧＲＰｓ基因的表达受植物发育的调节，具有组织或器官特异性，很多ＧＲＰ基因的表达还受环境因素的影响。     

Starvation and penetration of bacteria in soils and rocks

Summary The soil and subsurface strata are low nutrient environments and their bacterial inhabitants must adopt starvation responses to survive. These responses include the formation of dormant, viable cells which, although reduced in cell size and volume, are able to respond to any improvement in nutrient availability. Starved bacteria are able to survive for extended periods without nutrients and their reduced size allows them to disperse deeply within rocks and soils greatly improving their penetration. These combined factors may increase opportunities for bacteria to reach a deep waste disposal site.     

Arthropods associated with nests of Cacicus sp. and Psarocolius sp. (Passerida: Icteridae) in varzea forest near the meeting of the rivers Negro and Solimões (Central Amazonia,Brazil) at high water

We analysed the arthropod fauna from nine nests of Cacicus sp. and nine nests of Psarocolius sp. (Passerida: Icteridae), in the varzea forest of Central Amazonia, Brazil, during high water, establishing these nests as one of the probable refuges for several arthropods performing vertical migration during periods of flooding and high water, besides discussing the role of these arthropods in the nests. We also evaluate the effectiveness of the extraction of arthropods from nests using an apparatus based on the Berlese–Tullgren funnel. We obtained 15,128 arthropods from three subphyla, five classes and 16 orders. The nests were shown as complex ecosystems sheltering groups from different functional and trophic categories and revealed striking differences from those of terra firma, remarkably in Blattaria, Arachnida and Pseudoscorpiones. The increasing volume of the funnel and time of heat exposure was shown to be appropriate for extraction of the arthropods from the bulky nests of these birds.     

颅内胶质瘤术后放疗43例临床分析

目的：回顾总结４３例脑胶质瘤术后放疗的病例，分析影响预后的因素。方法：１９８８年３月至１９９２年１２月，４３例经术后病理证实为脑胶质瘤的病例。其中手术部分切除３７例（８６％），肉眼全切６例（１４％），术后放疗采用＾６０Ｃｏγ线。放射剂量为３０￣６０Ｇｙ，常规分割。结果：４３例总５年生存率２５．６％。高分级组１、３、５年生存率分别为７２％、２０％、１２％，低分级组的１、３、５年生存率分别为７２．２％     

板环式测力称重传感器的 CAD—分析与设计

本文以板环式测力称重传感器敏感元件的特性参数，外形尺寸，应变材料强度的数学建模为目标，以图１结构为例讨论和计算了这种结构形态下的应力场和应变场，并对其进行了优化设计。     

提高北方大树移植成活率的技术措施

大树移植成为北方城市园林绿化中的主要手段。依据多年实践，提出若干提高大树移植成活率的技术措施。     

卵黄缓冲液4℃保存人精液后的精子存活时间变化

探讨了卵黄缓冲液4℃保存后人类精子存活时间的变化。结果表明，经卵黄液处理24h，复温后在第6、12h观察，精子活动率迅速降低，存活时间缩短。提示卵黄液在改善穿卵率的同时，亦存在使精子丢失存活趋于同步的效应。