长江三峡地区优势植物的化学元素含量特征

分析了三峡地区１６种优势植物２０个元素的自然含量特征。〉１０００μｇ．ｇ＾－１的元素有Ｃａ,Ｋ和Ｍｇ,１００－１０００μｇ．ｇ＾－１的元素有Ａｌ,Ｐ,Ｓｉ,Ｆｅ,Ｓ和Ｍｎ,１０－１００μｇ．ｇ．＾－１的元素有Ｎａ,Ｓｒ,Ｚｎ,Ｂ,〈１０μｇ．ｇ＾－１的元素有Ｔｉ,Ｃｕ,Ｎｉ,Ｃｒ,Ｍｏ,Ｃｄ和Ｖ。     

运用油松年轮揭示承德市硫及重金属污染的历史

本文利用油松年轮研究了承德市逢１８００年以来大气污染的历史过程,结果表明：避署出庄油松年轮内Ｓ含量自本世纪初开始升高,比１９世纪初增加１－２倍,至７０－８０年代达３－５倍,而在最近８－１０年则达到１０倍以上,其中碧峰门古松木质部年轮内Ｓ含量由４０－５０μｇ．ｇ＾－１达到目前的５７２．９μｇ．ｇ＾－１,从而指示出承德市大气ＳＯ２浓度由城市化初期的＜０．１ｍｇ．ｍ＾－３增加到目前的３０ｍｇ．ｍ＾－３,     

承德市油松针叶硫及重金属含量动态及其与大气SO2之间的关系

本文分析了承德市油松（ＰｉｎｕｓｔａｂｕｔａｅｆｏｒｍｉｓＣａｒｒ．）针叶硫和重金属含量变化及其与大气ＳＯ＿２浓度之间的相关性,探讨了油松针叶对大气ＳＯ＿２的生物监测作用,结果认为：植物Ｓ含量生长末期＞休眠期＞生长初期＞生长旺盛期（ｐ＜０．００１）;重金属中Ｐｂ表现为类似的规律,Ｓ和Ｐｂ含量分别从０．７５ｍｇ·ｇ￣（－１）和０．７μｇ·ｇ￣（－１）上升到１．５８ｍｇ·ｇ￣（－１）和２．０μｇ·ｇ￣（－１）。Ｎｉ变化不明显;Ｚｎ、Ｃｕ和Ｆｅ呈下降趋势,但Ｚｎ在休眠期略有回升。Ｍｎ在休眠期最高,但生长期也很高,其余季节相对较低。这种变化特点与大气中ＳＯ＿２和总悬浮颗植物（ＴＳＰ）的变化趋势基本一致;油松针叶Ｓ含量与大气ＳＯ＿２浓度之间具有很显著的相关性,其中火车站监测点生长季节相关公式Ｙ＝－０．０２６３＋０．０９６５Ｘ（ｒ＝０．８９１１,ｐ＜０．００１）;城区Ｙ＝０．０１２６＋０．０６１８Ｘ（ｒ＝０．７８４１,ｐ＜０．０１）。利用后者可对整个承德市区的大气ＳＯ＿２污染状况进行生物监测。     

新疆呼图壁种牛场地区13种优势植物水溶性盐分的含量特点及数量分析

通过对新疆呼图壁种牛场地区１３种耐盐植物水溶性盐分含量的分析,结果阐述了盐分分布和积累的特点：１）大部分植物在盐分含量水平上是：Ｎａ＾＋〉Ｋ＾＋〉Ｍｇ＾２＋〉Ｃａ＾２＋,Ｃｌ＾－〉ＳＯ４＾２－〉ＨＣＯ３＾－〉ＣＯ３＾２－,Ｎａ＾＋超过２００００μｇ／ｇ,Ｃａ＾２＋不足８００μｇ／ｇ;Ｃｌ＾－达４．１６％,ＣＯ３＾２－仅为０．１１％。全盐量平均为２５．８１％;２）ＣＯ３＾２－、ＨＣＯ３＾－和Ｃａ＾２     

水稻对硒吸收,分布及硒与硅共施效应

水稻幼苗根吸收的＾７５Ｓｅ在顶叶分布较多,以下各叶依次减少,但根内积累更多,当Ｙｏｓｈｉｄａ营养液加入０．１和０．３μｇ／ｍｌ亚硒酸钠,根吸收＾３２Ｐ,幼苗长高并生根;但经０．６μｇ／ｍｌ处理后幼苗生长受抑制,叶片失绿。     

黑曲霉生产β—葡萄糖苷酶发酵条件的研究

经多项式回归分析,研究了不同浓度Ｎ源、Ｃ源、无机盐等对酶产量的影响,确定出最佳培养基配方为：麸皮４．９％,（ＮＨ４）２ＳＯ４０．４％,ＫＨ２ＰＯ４０．２９％,ＣａＣｌ２０．０５％,ＭｇＳＯ４·７Ｈ２Ｏ０．０４％,ＦｅＳＯ４·７５ｍｇ·Ｌ＾－ＺｎＣｌ２１．４ｍｇ·Ｌ＾－,０．２％油酸钠。并对培养温度１时间、培养基初妈ｐＨ、通气量、接种量、接种方式等培养条件进行优化,使黑曲霉生产β－葡萄糖苷酶的产量由     

滇池太湖新银鱼的生长特性与资源量关系的研究

为了滇池中太源新银鱼（ＮｅｏｓａｌａｎｘｔａｉｈｕｅｎｓｉｓＣｈｅｎ）达到稳产,高产,优质,高效的目的,管理部门急需寻求一个合理的资源平衡点,经３１个月的连续采样调查,应用ＶｏｎＢｅｒｔａｌａｎｆｆｙ生长方程,得到太湖新银鱼１９８９年和１９９０年生长方程分别为：Ｌ＝６．７０（１－ｅ＾－０．１９８（ｔ－０．２２５）,Ｗ＝１．７８（１－ｅ＾－０．１９８（ｔ－０．２２５））＾３和Ｌ＝７．４８（１－ｅ＾－     

影响高山红景天细胞悬浮培养中细胞生长和红景天苷积累的几个…

高山红景天细胞悬浮培养过程中３ｍｇ·Ｌ＾－１６－ＢＡ,０．３ｍｇ·Ｌ＾－１ＮＡＡ,６０ｍｍｏｌ·Ｌ＾－１氮源、０．５￣１．２５ｍｍｏｌ·Ｌ－１ＫＨ２ＰＯ４和２０ｍｇ·Ｌ＾－１蛋白胨,较适合于细胞生长和红景天苷的积累。在适宜的接种量下细胞培养２４ｄ后,生物量达１４．０４ｇ·Ｌ＾－１,干细胞中红景天苷含量为５．６６ｍｇ·ｇ＾－１。     

黑曲霉生产β-葡萄糖苷酶发酵条件的研究产

经多项式回归分析,研究了不同浓度Ｎ 源、Ｃ 源、无机盐等对酶产量的影响,确定出最佳培养基配方为：麸皮４ ．９ ％ ,（ＮＨ４）２ＳＯ４ ０ ．４ ％ ,ＫＨ２ＰＯ４ ０ ．２９ ％ ,ＣａＣｌ２ ０ ．０５ ％ ,ＭｇＳＯ４·７Ｈ２Ｏ０ ．０４ ％ ,ＦｅＳＯ４·７Ｈ２ Ｏ５ｍｇ·Ｌ－ １ ,ＺｎＣｌ２ １ ．４ｍｇ·Ｌ－ １ ,０ ．２ ％ 油酸钠．并对培养温度、时间、培养基初始ｐＨ、通气量、接种量、接种方式等培养条件进行优化,使黑曲霉生产β葡萄糖苷酶的产量由１７Ｕ·ｍｌ－ １ 增至２１ ．３Ｕ·ｍｌ－ １ ．     

中温碱性脂肪酶的研究：Ⅲ.扩展青霉PF868变株碱性脂肪酶的纯化及其…

扩展青霉ＰＦ８６８变株发酵液经硫酸铵盐析和Ｓｅｐｈａｄｅｘ－Ｇ－２００及Ｓｅｐｈａｒｏｓｅ４Ｂ柱层析纯化,获得纯化倍数为３２．４的酶粉。该酶分子量为２３４４２Ｄａｌ,酶学特性表明：该酶的最适作用温度为３２℃,５０℃保温３０ｍｉｎ仍保留５０％酶活性,最适ｐＨ为９．０,作用ｐＨ稳定范围在７．０－１０．０之间,Ｃａ＾２＋和Ｍｇ＾２＋对酶有激活作用,Ｆｅ＾２＋,Ｃｕ＾２＋和Ｍｎ＾２＋酶活力有抑制作用。     

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.