稀土元素对酥梨叶片氮、磷、钾及其同化能力的影响

本文报道了稀土元素对酥梨叶片中氮、磷、钾含量,叶绿素含量及其光合效率的影响。结果表明,稀土元素有效地促进树体对氮、磷、钾的吸收。其中对磷的促进作用更显著。同时,增加了叶绿素含量,提高了光合强度。从而,提高了果实产量和品质。     

稀土元素对酥梨叶片氮、磷、钾及其同化能力的影响

本文报道了稀土元素对酥梨叶片中氮、磷、钾含量,叶绿素含量及其光合效率的影响。结果表明,稀土元素有效地促进树体对氮、磷、钾的吸收。其中对磷的促进作用更显著。同时,增加了叶绿素含量,提高了光合强度。从而,提高了果实产量和品质。     

几种主要食用菌的遗传转化研究进展

对平菇、香菇、草菇、银耳、双孢蘑菇的遗传转化体系的构建及其应用的研究进展进行了综述,对存在的问题进行了分析,并对未来的发展前景进行了展望。     

昆虫的抗药性

随着杀虫剂的使用,越来越多的昆虫对杀虫剂产生了抗性。昆虫的抗药性已经对人类产生了严重的影响。从定义、发展简况、遗传起源、机理、检测方法及治理几个方面加以介绍,对昆虫的抗药性进行了简单的探讨。     

谷胱甘肽测定方法研究进展

对分光光度法、酶法、荧光法、电化学法以及和HPLC等测定方法的原理、发展和应用作了详细叙述,同时对其它方法也作了简单介绍,最后对谷胱甘肽测定方法的发展作了展望。     

湖南汉族、侗族16对遗传性状的调查

本对湖南汉族、侗族的16对遗传性状进行了调查。计算出了每对性状的出现率及除扣手和交叉臂外的14对遗传性状的基因频率,分别析了民族间和性别间的差异,同时还分析了惯用手,扣手、交叉臂之间的关系。     

芫荽子的超临界CO2流体萃取研究

本文用超临界ＣＯ２流体技术对芫荽子的萃取进行了研究,探讨了原料粒度、温度、压力、流体密度对萃取效率的影响,并对其中挥发油的选择性萃取作了初步探索。     

高校遗传学实验考核方式的改革探析

文章通过对遗传学实验考核方式的现状和发展趋势的分析,对其进行了改革尝试。根据遗传学实验课的教学目标和教学内容,将成绩考核方式分为学生实验室工作规范评价、学生对实验参与度的评价、实验报告评价、实验理论和操作评价4个方面,分别设置了10%、20%、40%和30%的不同权重,并对考核项目进行了量表分析。同时在实验教学工作中进行了检验,统计结果表明该方法取得了较好的效果。     

茶树铝、氟富集研究进展

茶树是铝、氟超富集植物,过量铝、氟累积于叶片严重威胁了人类健康,了解铝、氟在茶树体内的代谢机理对降低茶叶中的铝、氟含量很有必要。本文系统阐述了茶树对铝、氟吸收、转运、累积和解毒的最新研究进展,推测了茶树对铝、氟吸收、转运及解毒的机制,提出了今后茶树铝、氟富集研究的方向。     

放线菌分离方法的研究Ⅰ．抑制剂的选择

抑制剂的选择是放线菌分离工作必须解决的一个重要问题。研究了重铬酸钾对放线菌、细菌、真菌的作用。结果表明,它对土壤真菌、细菌有明显的抑制作用,而对放线菌无抑制作用,可作为选择性分离放线菌的一种高效、便宜的抑制剂。本文还对ＨＶ培养基进行了改良。     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.