Population biology of bryozoans: correlates of sessile,colonial life histories in freshwater habitats

Bryozoans are common, often abundant, sessile, colonial invertebrates of freshwaters. By reviewing what is known of their general ecology and considering in further detail the population biology of specific groups, we provide evidence that 1) populations are locally ephemeral and regional persistence is attained via a dynamic equilibrium between dispersal and colonization, and 2) sex may often be infrequent and a high degree of clonality obtains at both local and regional scales. On the basis of these characteristics we discuss how the group offers exceptional opportunities for investigating a number of fundamentally important ecological and evolutionary questions.The highly curious modification of the Molluscan type which the Polyzoa [=Bryozoa] present... the great beauty of their forms, and the facility with which they can in general be observed in a living state, cannot but render them special favorites for every lover of Nature; and for the more profound student must confer on them a peculiar significance, and invest their study with a scientific interest which is scarcely surpassed by that of any other group of animals.... (Allman 1856)     

山羊血液蛋白多态性的研究动态

综述了山羊血液蛋白多态性的研究动态,较详细地介绍了山羊血液生化遗传标记的研究现状及其在山羊育种中的应用,并对其应用前景作了展望     

烯烃的分子距离边数矢量(μ)及沸点的估计与预测

基于双键相对于单键键长的大小,提出了烯烃的分子距离边数（ＭＤＥ）矢量（μ矢量）;进而通过多元线性回归方法建立μ矢量与烯烃沸点之间的关系模型并进行预测,计算沸点与实验值之间的均方根误差仅为３．７８Ｋ,相关系数为０．９９９３。     

Bio-rational design of photosystem Ⅱ inhibitors (Ⅰ)──Molecular modeling of cyanoacrylates and ureas in photosystem Ⅱ D1 protein of Pisum sativum

Molecular modeling of cyanoacrylates and ureas with D1 protein of Pisum sativum have been presented. Studies show that these two kinds of inhibitors occupy the similar region in the D1 protein. Cyanoacrylates have more binding sites than ureas, thus they have higher activities.     

KCaF3结构相变的分子动力学模拟

基于无调节参数的Ｇｏｒｄｏｎ－Ｋｉｍ势和一种检测离子运动的新技术,以ＫＣａＦ３的分子动力学模拟结果为例,对钙钛矿ＡＢＸ３的离子分子固体的结构相变作了探讨．包括对阱势、折叠结构、能垒、超离子态、稳定性骨架和离子分子集团ＢＸ６的“尺寸”和“形状”．以期对离子分子固体的结构相变有一个基本了解．     

利用RAPD标记鉴定芥菜(Brasica juncea Cos.)品种(英文)

从６０种１０ｂｐ随机引物中筛选出７种引物,对８个芥菜变种的１６个品种（每个变种有２个品种）进行了随机扩增多态性ＤＮＡ（ＲＡＰＤ）鉴定,能快速、灵敏、较为简便获得了１６个芥菜品种的基因组ＤＮＡ指纹图谱．结果表明,不同引物在１６个品种上都有其特征ＤＮＡ带,一般只有１条,少数有２条．在同１个变种的２个品种之间存在着丰富的ＲＡＰＤ标记,通过比较２个品种各自独具的ＲＡＰＤ标记,就可明确地将２个品种区分．在所用的７种引物中,没有１种能同时将８对芥菜品种全部区分开,但用２种或２种以上的引物就完全可以将８对芥菜品种全部区分开．     

灵长类酪氨酸酶基因外显子1序列进化研究

酪氨酸酶是黑色素合成当中的关键酶,酪氨酸酶基因的突变将导致白化病,测定了黑猩猩,倭黑猩猩,大猩猩、猩猩、长臂猿、食蟹猴、猴猴９个灵长类中代表物种的酪氨酸酶基因外显子１的ＤＮＡ序列。     

弱酸性介质中Silicalite—1分子筛膜的制备与表征

在ＳｉＯ２－ＴＰＡＢｒ－ＮＨ４Ｆ－Ｈ２Ｏ弱酸性氟离子体系中,在玻璃基片上采用水热晶化法制备了Ｓｉｌｉｃａｌｉｔｅ－１（全硅ＺＳＭ－５）分子筛膜．通过ＸＲＤ,ＳＥＭ分析测试手段对所合成的分子筛膜进行了表征,并对膜合成中硅源,水量等影响因素进行了考察．     

甲苯—丙烯烷基化合成异丙基甲苯新型催化剂的研究

本文考察了用ＭｇＯ、ＣａＯ、ＮｉＯ、ＴｉＯ２、Ｆｅ２Ｏ３、Ｐ２Ｏ５、ＳｉＯ２、Ｆ和Ｌａ２Ｏ３改性的ＨＭ分子筛对甲苯－丙烯烷基化性能的影响．结果表明：ＭｇＯ、ＣａＯ改性导致活性和异丙基甲苯选择性降低;ＮｉＯ、ＴｉＯ２、Ｆｅ２Ｏ３改性主要影响选择性;ＳｉＯ２、Ｌａ２Ｏ３改性在含量较低时基本不影响活性和选择性,含量高时活性降低,邻异丙基甲苯选择性增加．影响活性和选择性的主要因素可能是分子筛的骨架硅铝比和钠含量．     

二聚雌二醇分子钳的合成及分子识别性能的研究

通过二亚甲基苯和二亚甲基吡啶桥联两发了子雌二醇,而得到一类新型的钳型分子受体,经ＭＳ,ＩＲ,＾ＨＮＭＲ及元素分析确证了其结构,利用分光光谱滴定法考察基分子识别性能,结果表明,该类分子钳（ｍｏｌｅｃｕｌａｒｔｗｅｅｇｅｒ）可识别芳胺及其衍生物。