细菌产木聚糖酶发酵条件的研究*

研究了碳源、氮源以及其他因子对木聚糖酶高产菌ＷＬＵＮ０２４（Ｐｓｅｕｄｏｍｏｎａｓ ｓｐ．）产酶的影响,结果表明在麸皮６ｇ／Ｌ、（ＮＨ４）２ＳＯ４ ０．８ｇ／Ｌ、Ｋ２ＨＰＯ４ ０．４ｇ／Ｌ、接种量５％－１０％的条件下,３７℃培养３６ｈ,其木聚糖酶活力可达６００ＩＵ／ｍＬ。同时研究了在较优条件下该菌的摇瓶产酶曲线。     

雅致枝霉TE7—15发酵生产γ—亚麻酸的实验研究

研究了温度、时间、碳源和氮源对雅致枝霉诱变株ＴＥ７－１５的菌体生长、油脂积累ＧＬＡ合成的影响,确定了ＴＥ７－１５菌株适宜的摇瓶发酵培养条件,使其菌体生物量达到１９．０４ｇ／Ｌ,ＧＬＡ产量达到１０７９．９５ｍｇ／Ｌ,可以满足工业化生产的要求。     

高产油脂酵母菌选育及摇瓶发酵条件的研究

经紫外线和ＥＭＳ复合诱变选育出一株高产油脂的优良酵母菌株,命名为Ｌｉｐｏｍｙｃｅｓ．Ｓｔａｒｋｅｙｉ　ＨＬ。通过摇瓶培养,对各项与菌体产油脂相关的因素作了单因子实验,确定了摇瓶发酵培养的最佳产油脂条件：碳源,废糖液１６５．７ｍｌ／Ｌ;氮源,硫酸铵１．０８ｇ／Ｌ;Ｃ／Ｎ：６１：１;培养温度为２８℃;接种量１０％;发酵时间９６ｈ; ｐＨ５．０。最后可得油脂产量 ５．９ｇ／Ｌ;菌体生物量 １１．０ｇ／Ｌ;油脂含量 ５３．６％。对菌体内油脂组成进行了气相色谱与质谱分析,结果如下：软脂酸３３．２％,棕     

酵母SOD高产工程菌培养优化条件研究

研究了酵母ＳＯＤ高产工程菌培养条件,培养基组分、糖浓度、ｐＨ、通气量、培养时间、微量元素等对该菌的生物量和ＳＯＤ含量均有影响。其中通气量和微量元素的影响最显著。在优化条件下,细胞生物量为５．１５ｇ／１００ｍｌ培养基;ＳＯＤ产量为２０７０Ｕ／ｇ菌体。     

STUDIES ON THE PATTERN OF MEGASPOROGENESIS AND MICROTUBULAR CYTOSKELETON CHANGES IN CYMBIDIUM SINENSE

ＳＴＵＤＩＥＳＯＮＴＨＥＰＡＴＴＥＲＮＯＦＭＥＧＡＳＰＯＲＯＧＥＮＥＳＩＳＡＮＤＭＩＣＲＯＴＵＢＵＬＡＲＣＹＴＯＳＫＥＬＥＴＯＮＣＨＡＮＧＥＳＩＮＣＹＭＢＩＤＩＵＭＳＩＮＥＮＳＥ￥Ｓ．Ｙ．ＺｅｅＸ．Ｌ．Ｙｅ（１ＢｏｔａｎｙＤｅｐａｒｔｍｅｎｔ,Ｕｎｉ...     

黄山西坡青冈种群结构与分布格局研究

黄山西坡青冈种群结构与分布格局研究陈小勇,张庆费,吴化前,宋永昌（华东师范大学环境科学系,上海,２０００６２）ＡＳＴＵＤＹＯＮＴＨＥＳＴＲＵＣＴＵＲＥＡＮＤＳＰＡＴＩＡＬＰＡＴＴＥＲＮＳＯＦＣＹＣＬＯＢＡＬＡＮＯＰＳＩＳＧＬＡＵＣＡＰＯＰＵＬＡＴＩＯ...     

花生四烯酸高产突变株的选育及其发酵调控

以拉曼被孢霉（Ｍｏｒｔｉｅｒｅｌｌａ ｒａｍａｎｎｉａｎａ）ＳＭ５４１为原始菌株,经过紫外线复合氯化锂诱变处理,得到突变株ＳＭ５４１－９,其生物量上１２．６ｇ／Ｌ提高到２８．８ｇ／Ｌ,油脂含量由５．８ｇ／Ｌ提高到１５．７ｇ／Ｌ。花生四烯酸含量由３２１ｍｇ／Ｌ增加到６２３ｍｇ／Ｌ。传代实验表明,ＳＭ５４１－９具有良好的遗传稳定性,以葡萄糖为碳源,硝酸钾为氮源的最适培养条件下,１０Ｌ罐发酵,生物量和花     

芽孢杆菌A-30产碱性β-1,4-聚糖酶固体发酵研究

筛选得到一株高产β－１,４－聚糖酶的耐碱性芽孢杆菌Ａ－３０,其固体发酵（Ｓｏｌｉｄ ｓｔａｔｅ ｆｅｒｍｅｎｔａｔｉｏｎＳＳＦ）时最适培养条件：起始ｐＨ为８．０、培养温度３２℃、１０％（ｖ／ｗ）接种量,含水量为６６．６％（ｖ／ｗ）,以０．５％的ＮａＮＯ_３为无机氮源,发酵９６ｈ,木聚糖酶活可达６４５７ＩＵ／ｇ（Ｄｒｙ ｂａｃｔｅｒｉａｌ ｂｒａｎ）,纤维素酶活（ＣＭＣａｓｅ）可以达到１８．６６ＩＵ／ｇ。氮源组成、温度、ｐＨ及发酵时间等对Ａ－３０所产木聚糖酶和纤维素酶比例有较大影响。葡萄糖对Ａ－３０的阻遏效     

子午岭林区不同环境土壤微生物生物量与肥力关系研究

子午岭林区不同环境土壤微生物生物量与肥力关系研究＊张成娥陈小莉郑粉莉（中国科学院水利部水土保持研究所陕西杨陵７１２１００）ＳＴＵＤＹＯＮＲＥＬＡＴＩＯＮＳＨＩＰＢＥＴＷＥＥＮＳＯＩＬＭＩＣＲＯＢＩＡＬＢＩＯＭＡＳＳＡＮＤＦＥＲＴＩＬＩＴＹＩＮＤＩＦＦ...     

水分胁迫条件下谷子抗旱生理特性的研究

水分胁迫条件下谷子抗旱生理特性的研究程林梅阎继耀张原根张和（山西省农业科学院作物遗传研究所,太原０３００３１）ＳＴＵＤＹＯＮＤＲＯＵＧＨＴＲＥＳＩＳＴＡＮＴＰＨＹＳＩＯＬＯＧＩＣＡＬＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＦＯＸＴＡＩＬＭＩＬＬＥＴＵＮＤ...     

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.