亚热带丘陵茶园间作白三叶草的生态效应

在亚热带丘陵区1a生幼龄茶园通过连续4a的大田对比试验,研究了茶园间作白三叶草的生态效应,结果发现：茶园间作白三叶草降低了土壤容重,提高了土壤孔隙度、有机质、全N、水解N的含量、K的活性、蚯蚓的数量和生物量,消耗了部分有效P;增加了土壤关键层次（0—20cm）和关键时期（4～6月）的水分含量,延缓和缩短了夏季高温干旱与秋季持续干旱时间;获得了土壤降温时增温、保温与升温时降温的双向动态调控效果,增加了同一层次土壤温度的稳定性,延缓了高温和低温的出现时间,缩短了过度高温时间,减少了高温对茶树生长产生的影响;抑制了杂草生长,增加了天敌的种类和种群数量,减少了虫害发生率。从而形成了立地环境．茶树．伴生生物群落系统自我调节的动态平衡,促进了茶树生长,改善了茶叶品质,显著增加了茶叶产量。与清耕茶园相比,茶园间作白三叶草后,春秋茶的酚氨比分别下降了17．10％和30．90％,产量提高了32．65％。     

伊克昭盟项目区水土保持的生态效益

根据对伊克昭盟世行项目区的监测数据,分析了项目实施后水土保持的生态效益。结果表明,项目实施后,改善了土壤的理化性质,增加了土壤肥力;同时,提高了当地的林草植被覆盖度,改善了局地气候,促进了生物多样性的恢复和保护。     

远程教育培训给生物教学带来新的生机

远程教育培训给生物教学带来新的生机。夯实了专业知识,梳理了生物知识,使我认识到应该如何把握生物课堂教学,提高了课堂教学设计能力,凝聚了生物教师的力量,使老师们学到了很多知识和教学技能,解决了平时教学中的一些难题,提升了生物的教学水平。     

亚热带丘陵茶园间作白三叶的土壤环境调控效果

在亚热带丘陵区1年生幼龄茶园通过连续4年间作白三叶大田试验,研究了其对茶园土壤环境及茶叶品质、产量的影响,结果表明,茶园间作白三叶降低了土壤容重,提高了土壤孔隙度、有机质、全氮、水解氮的含量及钾的活性,消耗了部分有效磷;增加了土壤关键层次（0～20cm）和关键时期（4～6月）的水分含量,延缓和缩短了夏季高温干旱与秋季持续干旱时间;获得了土壤降温时增温、保温与升温时降温的双向动态调控效果．增加了同一层次土壤温度的稳定性,延缓了高温和低温的出现时间,缩短了过度高温时间。从而促进了茶树生长,改善了茶叶品质,显著增加了茶叶产量。与清耕茶园相比,茶园间作白三叶后,春秋茶的酚氨比分别下降了17．10％和30．90％,产量提高了32.65％。     

陕西蓝田新生界现场会议于11月上旬在西安举行

地质部、有关的大专院校和中国科学院三方面的11个单位,在过去的工作基础上,今年又在蓝田地区进行了大量考察和研究工作,井由中国科学院古脊椎动物与古人类研究所负责筹备举行了这次现场会议。现场会议是和全国第四纪第二次学术会议联合举行的,在第四纪学术会议之后,举行了现场会议。现场会议从11月3日下午起到8日止,共举行了5天半。会议广泛地讨论了蓝田新生界的问题,交流了工作经验,肯定了成绩,指出了缺点。会议开得很好,收获很大,基本上完成了大会所规定的任务     

促进微生物实验技术创新水平的改革初探

为了加强对本科生综合素质和能力的培养 ,激发学生的学习兴趣 ,我们对微生物实验课的教学内容进行了一系列改革 ,优化了实验项目 ,节约实验成本 ,并且引入科研成果转化实验 ,同时改进了实验方法和手段 ,实验结果更为准确。这些措施蕴含了较高的理论水平 ,增加了教学信息量 ,明显提高了教学效果 ,为培养高素质人才奠定了基础。     

开展食用菌栽培活动培养学生综合能力

1通过食用菌栽培活动,能有效的使学生获得知识,掌握知识,扩大知识面在初中生物学教材中,介绍了大型真菌磨菇的形态和生活史,通过课堂传授,学生缺乏感性认识,印象不深,通过开展食用菌栽培活动,学生不仅详细地了解了食用菌的形态,而且还亲自目睹了食用菌的整个生长发育过程,既了解了食用菌生长所需的外界条件,又掌握了多种食用菌的栽培管理方法。许多学生反映,通过食用菌栽培活动,不仅对真菌的形态和生活史有了进一步的了解,而且还培养了学生科学实验的基本技能。既巩固了学到的书本知识,开阔了学生的视野,又使学生掌握了一门致富技术,可以为…     

转基因鸡的制备方法探讨

由于鸡本身的众多优点,转基因鸡的研究逐渐受到了研究者的重视,简要介绍了转基因鸡的发展史,对各种转基因技术方法进行了比较和分析,提出了每种方法的优缺点,尤其在精子介导法上作了较为详细的论述,并展望了转基因鸡的应用前景。     

郑州市第五人民医院PACS医学影像系统设计

本文介绍了郑州市第五人民医院PACS医学影像系统,描述了系统的目标,构架,功能和特点,采用了功能化的模块设计。可满足后续设备联入系统,已应用于医院的医疗过程中,解决了医学图像的获取,显示,存储,传输和管理等问题。符合DICOM3.0国际信息交换标准,实现了数字化,网络化和无胶片化的现代化医学影像诊断与管理,显著提高了诊疗质量和工作效率,降低了医疗成本,增加了经济收入和社会效益,对其它医院实现数字化进程也具有一定的借鉴意义。     

生物化学教学与QQ交流平台(群)的姻缘

在生物化学教学过程中既要传授基本知识,又要注重学生综合能力的培养。文中针对当前生物化学教学中存在的主要问题,提出了利用QQ交流平台的优势和特点,在师生间搭建QQ交流平台辅助教学。实践证明,该平台扩展了有限的课堂教学,增强了师生互动交流,激发了学生的学习兴趣,提高了学生学习的积极性和主动性,培养了学生的科学精神和创新能力,提高了教学质量。     

广西金钟山鸟类保护区鸟类多样性初步研究

本文共记录到金钟山鸟类274种,分别隶属于18目57科,其中陆生鸟类251种,水鸟23种;以留鸟为主,共157种;候鸟、旅鸟分别为104种、13种;东洋种为优势类群,共有171种,古北种和广布种分别为4种、27种。这些鸟类中有国家重点保护鸟类39种,中国特有种鸟类3种,列入世界自然保护联盟红皮书名录中的鸟类5种,列入中国濒危动物红皮书名录中的鸟类20种,列入CITES附录中的鸟类34种。本文还对金钟山鸟类保护区的5种不同生境类型的鸟类种类组成作了比较,结果表明灌丛＋农田的鸟种多样性指数最高,为3．04;水域的鸟种多样性指数最低,为2．14。     

Scaling of Folding Properties in Go Models of Proteins

Insights about scaling of folding properties of proteins are obtained bystudying folding in heteropolymers described by Go-like Hamiltonians. Bothlattice and continuum space models are considered. In the latter case, themonomer-monomer interactions correspond to the Lennard-Jones potential.Several statistical ensembles of the two- and three-dimensional targetnative conformations are considered. Among them are maximally compactconformations which are confined to a lattice and those which are obtainedeither through quenching or annealing of homopolymers to their compactlocal energy minima. Characteristic folding times are found to grow aspower laws with the system size. The corresponding exponents are notuniversal. The size related deterioration of foldability is found to beconsistent with the scaling behavior of the characteristic temperatures:asymptotically, the folding temperature becomes much lower than thetemperature at which glassy kinetics become important. The helicalconformations are found to have the lowest overall scaling exponent andthe best foldability among the classes of conformations studied. Thescaling properties of the Go-like models of the protein conformationsstored in the Protein Data Bank suggest that proteins are not optimizedkinetically.     

河南大学校园鸟类初步调查

截至2010年12月,为期2年的河南大学校园鸟类调查共记录到鸟类44种,隶属11目、25科;其中雀形目鸟类28种,留鸟20种,夏候鸟18种,冬候鸟和旅鸟各3种,分别占总数的63.6%、45.5%、40.9%、6.8%和6.8%;区系分析表明东洋种9种,古北种16种,广布种19种,分别占总数的20.5%、36.4%和43.2%。整体表现出南北混杂,古北种鸟类较东洋种比例大,广布种鸟类较多的特点。在调查基础上,提出了一些校园鸟类保护的建议。     

甘肃崆峒山种子植物区系科的分析

崆峒山位于甘肃省平凉市境内 ,面积约 1 82 .5 2km2 。有野生种子植物 662种 ,隶属于 3 43属 ,88科。其中世界广布科 2 3个 ,占总科数的 2 6.1 4 %;热带科 3 5个 ,占 3 9.77%;温带科 3 0个 ,占 3 4.0 9%,并且单属科和少属科较丰富。虽然热带科的比例较高 ,但分布至该区的属和种大多是温带性质的。崆峒山的优势科是菊科、禾本科、蔷薇科、豆科、唇形科等 ,而表征科则是桦木科、麻黄科、胡颓子科、忍冬科、罂粟科、榆科、金粟兰科、虎耳草科等。该区系的起源有明显的古老性。     

Application of Different Variants of the BEM in Numerical Modeling of Bioheat Transfer Problems

Heat transfer processes proceeding in the living organisms are described by the different mathematical models. In particular, the typical continuous model of bioheat transfer bases on the most popular Pennes equation, but the Cattaneo-Vernotte equation and the dual phase lag equation are also used. It should be pointed out that in parallel are also examined the vascular models, and then for the large blood vessels and tissue domain the energy equations are formulated separately. In the paper the different variants of the boundary element method as a tool of numerical solution of bioheat transfer problems are discussed. For the steady state problems and the vascular models the classical BEM algorithm and also the multiple reciprocity BEM are presented. For the transient problems connected with the heating of tissue, the various tissue models are considered for which the 1st scheme of the BEM, the BEM using discretization in time and the general BEM are applied. Examples of computations illustrate the possibilities of practical applications of boundary element method in the scope of bioheat transfer problems.     

Comparative analysis of sensitivity of cholinesterases of different origin to bis-onium reversible inhibitors

Analytical review of the literature data on interaction constant of cholinesterases from different animal (vertebrates and squids) with 45 bis-onium reversible inhibitors forming homologous series with regularly varied structure has been carried out. Values of the competitive, uncompetitive and generalized inhibitor constants are compared. Interspecies and intraspecies differences in sensitivity of ChE are revealed. Results of conformational analysis of the investigated ligand molecules are presented. The data on population of individual conformations are compared with the data on anticholinesterase potency. Conclusions are made on the action mechanism of the investigated compounds and predominant place of their sorption. The presented data are considered from the point of view of comparative biochemistry and in the light of current information about the active center structure of cholinesterases.     

Principles of systematics and the system of bivalves

The systems of the class Bivalvia accepted in recent manuals are discussed. The system proposed by L.A. Nevesskaja, O.A. Skarlato, Ya.I. Starobogatov, and A.G. Eberzin (1971) is substantiated and updated. Morphological characters important for the establishment of taxa of different ranks are listed. Three superorders and 17 orders are established; two orders, which are restricted to the Cambrian and the beginning of the Ordovician, are placed outside the accepted superorders.     

Possible evidence of predation in placoderms (Pisces) of the Evlanovo basin of central Russia

Two placoderms of different orders from a concretion of the Zyabrevo locality (Evlanovo Regional Stage, Frasnian) in central Russia are described. Five plates of the ventral and lateral sides of the trunk armor are assigned to a plourdosteid arthrodire. Three bones located in the region of its stomach are determined as a juvenile ptyctodontid, Ctenurella sp. Records providing actual evidence of predation in Devonian vertebrates are extremely scarce. Finds of this kind are listed for the first time.     

贵州疣螈骨骼系统的研究

本文运用硬骨-软骨双染色技术对贵州疣螈（Tylototriton kweichowensis）的骨骼系统做了较全面的观察研究,包括头骨、脊柱和前后肢带骨,并对各骨块的形状、位置以及与邻近骨块的关系都作了详细的描述。最后,将贵州疣螈与东方蝾螈、有斑肥螈的骨骼系统进行了比较,为揭示蝾螈科属间演化关系提供一定的依据。     

黄连木五倍子的生态研究与利用

一、产地自然概况黄连木五倍子最早发现于河南省南部信阳市郊贤山脚下(东经114°0′,,北纬32°10′)。该地为低山丘陵,海拔90一320m,南部紧连鸡公山厂傍依南湾水库和狮河。