栝楼属花粉形态研究及其在分类学上的意义

 本文收集了国内外栝楼属Trichosanthes 31种1变种，在光学显微镜和扫描电镜下，进行了花粉粒形态的比较观察。该属花粉粒为3孔沟型，外壁表面纹饰可分为四个类型，即：疣状或皱波状(小苞组)，粗网状(大苞组)，细网状或光滑(叶苞组)，近光滑或皱波状(王瓜组)。这四个类型的划分与植物形态分类基本一致，可作为分组及分种的依据之一。花粉特征支持将叶苞组分为叶苞亚组和柔毛亚组，如叶苞亚组有明显的沟，而柔毛亚组没有。     

天花粉蛋白研究新进展

天花粉蛋白是从葫芦科植物栝楼块根中分离纯化得到的单链核糖化失活蛋白，其一级结构、二级结构及空间结构皆已阐明。它的作用方式属于ＲＮＡ Ｎ－糖苷酶，专一水解真核细胞核糖体ｒＲＮＡ中Ａ４３２４位腺苷酸的Ｎ－Ｃ糖苷键，抑制真细胞核糖体功能。近来研究表明天花粉蛋白可以抗肿瘤、抗病毒，本文对其机理进行了探讨。利用体外无细胞翻译系统观察到天花粉蛋白对其自身核糖体存在毒性作用。     

浅谈基因工程在农业生产中的应用

引言：栝楼有抗菌、抗衰老、抗癌、抗艾滋病等作用,对糖尿病有一定的治疗作用对高血压、高血脂、高血粘度有辅助疗效,能提高肌体免疫功能,是人们首选的体闲绿色保健食品。栝楼是雌雄异株植物,用种子繁殖雌雄难辨,用分根法繁殖系数低,使发展良种生产受到一定的限制。     

学校体育教育理念之思考

本文由理念及源泉、教育发展趋势,并在体育教育实践基础上总结研究相关的体育教育理念知识体系框架,为学校体育教育工作提供理论依据。     

V.A.K.及教学针对方法

通过刺激——反映（S-R）联结,每个人在学习历程中建立起一系列习得性的对自身行之有效的学习策略和学习习惯。作为教师,针对学生不同学习类型的认识,可以更好的引导学生,帮助他们认识自己,发掘自身潜质,形成自己独创性的良好学习习惯,从而极大的发挥其主观能动性。     

梾木属的一新亚属——华茱萸亚属

Cornus L. s. 1. is a large polytypic genus. The classificantion of which has been so different that some authors recognize several separate genera, while others treat them as ei- ther subgenera or sections.  New evidence from many disciplines such as palynology, cyto- logy, wood anatomy and embryology supports the view that the genus should remain in the broad sense.  I basically agree with the treatment by Ferguson (1966b) before my finishing a comprehensive study on Cornus L. s. 1. except for supporting  the separation  of subgenus Afrocrania as an independent genus.  A new subgenus Sinocornus Q. Y. Xiang, containing one species, C. chinensis Wangerin, is established here on account of its inflorescence axillary and different from the other members of the genus which all have terminal inflorescences only. The inflorescence developed from a terminal bud implicates the sympodial nature of axis of stem and the one from an axillary bud the monopodial one.   It is reasonable to regard the character as of subgeneric value.  Also a new combination, Cornus subgen. Syncarpea (Na- kai) Q. Y. Xiang, is proposed here as a substitute for Cornus subgen.  Benthamia (C. B. Clar- ke) Schneider used for a long time.  Because the valid publication of the former name subgen. Syncarpea Nakai is earlier than the latter one.  The types of inflorescences of 8 subgenera re- presented by type or selected species are illustrated.