"医疗器械"一词的英译与思考

近年来,随着国内医疗器械领域的创业公司不断兴起,“医疗器械”一词被广泛使用于公司名称注册、内容介绍、网站宣传及产品使用说明等方面,而其英译名却五花八门,没有统一的标准。文章通过数据采集、实例分析来辨明“医疗器械”各种英译的区别,旨在为广大译者提供有关该词的英译思路。     

武汉地区网纹层的若干问题

根据大量钻孔和开挖剖面的资料,对武汉地区网纹层的剖面特征、物质组成、孢粉组合、成因以及其与新构造运动的关系,作了初步的论述。     

水稻花粉悬浮培养及其在育种上的应用

评估了２０个水稻品种离体花粉悬浮培养产生愈伤组织和再分化植株的能力，并进行了花粉悬浮培养试验，结果表明；品种之间反应差异很大。来源于日本的“黎明”（粳稻）最敏感。“黎明”植株再分化的频率达８４．１％。在愈伤组织的形成和植株再分化过程中，除其它一些因子外，基因型的差异有一定制约作用。通过水稻花粉悬浮培养诱导出的新品系“Ｎ１０”，其特征有：早熟，穗大，株高（９０～１００ｃｍ），产量高和抗稻瘟病等。     

Structural and expressional analysis of a cDNA that expresses predominantly in rice stamens

The development of stamen is an important stage during the sexual reproduction in higher plants. Studying the genes that predominantly or even specifically expressed in stamens will aid in undestanding the molecular mechanism of stamen development. The structure of a rice CHS-like gene (D5) which predominantly expressed in anthers has been analysised, showing high structural similarity with two other anther-specific genes (A1 and BA42) fromBrassica napus. Northern analysis also reveals that the three genes share a similar expression pattern and that the expression of D5 may relate to the early development of pollens. It is concluded that D5, A1 and BA42 represent a group of diverged CHS-like genes which are related to stamen development.     

Effects of extracellular calmodulin on pollen germination and tube growth

The effects of calmoddin (CaM) antagonist W7-agarose, anti-CaM serum and exogenous purified CaM on pollen germination and tube growth ofForsythia suspensu were studied. The pollen germination and tube growth were inhibited or completely stopped by CaM antagonist W7-agarose. The addition of exogenous purified CaM stimulated pollen germination and tube growth, whereas the same amount of bovine serum albumin (BSA) had no effect. The inhibitory effects caused by W7-agarose and anti-CaM serum could be reversed completely by the addition of exogenous purified CaM. The tube growth of germinated pollen was also inhibited or completely stopped by W7-agarose. The results suggest that endogenous extracellular CaM initiates pollen germination and tube growth, whereas exogenous CaM enhances the above processes.     

秦安大地湾高分辨率全新世植被演变与气候变迁初步研究

主要根据孢粉分析结果,并结合磁化率,碳酸钙恢复了陇西黄土高原地区全新世期间植被气候的变化过程。结果表明全新世气候存在３个大的阶段,全新世早期气候以寒冷为主要特点,中全新世气候温暖湿润,晚全新世气候以干旱为主要特征。     

柑橘类植物染色体制片新技术

为获得清晰的染色体图像,对柑橘的体细胞染色体和花粉母细胞染色体制片方法进行了研究.开发了染色体制 片新技术:①体细胞染色体制片选取3～5mm长的幼叶,用体积分数为0.3%的纤维素酶和体积分数为0.2%的果胶 酶于37℃下进行2h酶解;②花粉母细胞的染色体制片则选取约开花3周前花蕾中的花药,酶解的适宜条件为3%纤 维素酶和2%果胶酶混合酶液于37℃下进行3h酶解.可得到背景干净、伸展分散良好、清晰可靠的染色体图像.     

中药菟丝子花粉形态的扫描电镜研究

利用扫描电子显微镜对山东菟丝子属(Cuscuta L.)3种植物的花粉形态进行了观察研究。结果显示该属花粉粒为长球形，具3～4沟。表明该属花粉粒大小、孔沟数量和外壁雕纹可以作为种间分类的依据。     

胡枝子属与米口袋属花粉亚显微形态特征的比较研究

报道了山东胡枝子属6种植物花粉与米口袋属4种植物花粉的亚显微形态特征，并对两属进行了比较分析．它们韵花粉从赤道面观均呈近长球形，极面观呈三裂圆形；具三条萌发沟；花粉粒的大小，极轴长27．2～19．5μm，赤道轴宽21．3～11．8μm．两属植物花粉的大小、表面纹饰、花粉粒萌发沟的沟裂宽度均有明显差别。研究结果表明，胡枝子属和米口袋属花粉的亚显微形态特征支持传统分类中的属、种级水平的分类。     

焊接孔长度对钢框架梁-柱刚性节点性能的影响

对焊接孔长度扩大的钢框架梁－柱刚性节点进行了空间非线性有限分析。分析结果表明，焊接孔长工的扩大显著地降低了梁－柱连接面处的对接焊缝和焊接孔切角端开裂以及翼缘脆性破坏的可能性，但过长的焊接孔也会导致梁侧向稳定的丧失。