中青年肺心病90例临床分析

５５岁以下中青年肺心病９０例与同期收治的６０岁以上老年肺心病９０例作对照,发现中青年组有如下特点：①原发疾病两组均以慢性支气管炎多见,但中青年组肺结核、支气管扩张常见,合并高血压、冠心病少见。②主要症状、体征以咯血、杵状指、体温大于３７℃多见,神志改变、早搏较老年组少见。③白细胞总数增高、痰培养Ｇ＋球菌多见。Ｇ－杆菌少见。④血气分析低氧血症多见。⑤心电图以右室肥厚多见,与Ｘ线右室肥厚多相一致。⑥多脏器衰竭（ＭＳＯＦ）为主要死因     

具有收获的Kolmogorov系统的次谐分枝与浑沌现象

研究一类食饵种群具有常数收获率的Kolmogorov生态系统的周期激励模型,应用Melnikov方法,得到了该系统存在浑沌与次谐分枝的某些充分条件．     

β-蝮蛇毒素对蟾蜍交感神经节突触传递的影响

β-蝮蛇毒素(β-agkistrodotoxin简写β-AgTX)对骨胳肌神经肌肉接头的作用已有实验分析,本文则观察了β-AgTX对蟾蜍交感神经节胆碱能性和非胆碱能性突触电位的作用。结果表明,β-AgTX对胆碱能性快兴奋性突触后电位(f-EPSP)和由压力微量注射ACh产生的ACh电位快成分有可逆性抑制作用,且对f-EPSP的幅值抑制率明显大于对ACh电位的抑制率,方差分析显示β-AgTX对f-EPSP和对ACh电位的抑制之间的差异显著(P<0.01)。β-AgTX对非胆碱能性迟慢兴奋性突触后电位(1s-EPSP)无明显作用。本结果提示β-AgTX可能是通过抑制节前神经末梢释放AGh的突触前机制和占据突触后N型胆碱能受体影响ACh的作用之突触后机制,抑制蟾蜍交感神经节的胆碱能性传递过程。     

中国地谷蛾亚科一新属三新种(鳞翅目,谷蛾科)

记述我国地谷蛾亚科Meessiinae 1新属:骨斑地谷蛾属Maculiscleritica gen.nov.,及3新种:三角骨斑地谷蛾M.triangulidens sp.nov.,弯刺骨斑地谷蛾M.curvispinea sp.nov.和截齿骨斑地谷蛾M.truncatidens sp.nov,.提供新种成虫外形、翅脉和雌雄外生殖器特征图及分类检索表.模式标本保存在南开大学生命科学学院昆虫标本室.     

Effect of the number of rol genes integrations on phenotypic variation in hairy root-derived Hypericum perforatum L. plants

The extent of phenotypic variation of St. John's wort (Hypericum perforatum L.) plants transformed with wild agropine ATCC 15834 Agrobacterium rhizogenes plasmid was evaluated with respect to the number of rol genes integrations. The transfer of T(L)-DNA to plant explants during each transformation event was incomplete with different rolA, rolB, and rolC copy numbers. Along with typical features representing the hairy root syndrome, an altered size, number and density of dark and translucent glands, changes in ability to synthesize secondary metabolites, and reduced fertility were observed. The highest copy number of transferred rol genes resulted in weak expression of transgenic character and comparable quantitative parameters with the controls. Only 1 out of 11 transgenic clones was able to produce seed progeny and not more than 4 out of its 35 offsprings were positive for rolC gene integration. Sterility of the clones was due to retarded development of both gametophytes.     

The Plant Cell Surface

Multicellular organization and tissue construction has evolved along essentially different lines in plants and animals. Since plants do not run away, but are anchored in the soil, their tissues are more or less firm and stiff. This strength stems     

向日葵胰蛋白酶抑制剂SFTI-1

向日葵胰蛋白酶抑制剂(sunflower trypsininhibitor-1,SFTI-1)是近来发现的Bowman-Birk抑制剂(Bowman-Birk inhibitor,BBI)家族的新成员。由14个氨基酸残基组成的SFTI-1是具有胰蛋白酶抑制活性的天然环肽。SFTI-1的天然环状结构使它成为药物研发中的重要前导化合物。本文综述了近年来SFTI-1在结构、功能、环化机制等方面的研究进展。