培养条件对钝顶螺旋藻(Sp)NS-90020脂肪酸组成和含量的影响

研究了不同培养条件对钝顶螺旋藻（Sp）NS－90020脂肪酸合成的影响。随着温度升高,其不饱和脂肪酸,γ一亚麻酸（GLA）相对含量降低,总脂肪酸含量升高,当温度为40℃时总脂肪酸和γ-亚麻酸绝对含量都达到最大值,分别为73．4mg／g干重和11．9mg／g干重;当培养基中NaCl浓度高于0．017mol／L时,其GLA相对含量降低,但低于0．0017mol／L时,对其脂肪酸组成无显著影响;氨水使其脂肪酸和GLA绝对含量升高,并在50mgN（NH3·H2O）时达到最大值,分别为67．96mg／g干重和13．63mg／g千重;暗处理92h使其总脂肪酸和GLA绝对含量升高;缺乏Fe2 或Mg2 或Mo2 时,其总脂肪酸和GLA绝对含量降低,而缺乏PO43-时,其总脂肪酸和GLA绝对含量略有升高。     

深黄被孢霉发酵生产γ—亚麻酸的研究

以深黄色被孢霉ＡＳ３．３４１０（ＭｏｒｔｉｅｒｅａｌｌａｉｓｄｂｅｌｌｉｎａＡｓ３．３４１０）的变异株Ｍ６为出发菌株,γ－亚麻酸含量２１０ｍｇ／Ｌ。经紫外线和微波处理得到变异株Ｍ６－２２,摇瓶发酵γ－亚麻酸含量１１８１ｍｇ／Ｌ,２００升发酵罐发酵γ－亚麻酸含量达到１３５０ｍｇ／Ｌ,对２００升罐发酵的后提取工艺进行了研究,以乙醇和正己烷分步抽提效果最好,脲素包合法的实验结果表明,在７０～７５℃,３ｈ     

被孢霉W_（A－90）发酵生产γ－亚麻酸的研究

本文研究了由被抱霉变株ＭＡ－９０生产了γ－亚麻酸的发酵条件．确定了最适碳源、复源及Ｃ／Ｎ．初步建立了生产γ－亚麻酸的工艺条件。葡萄糖、蔗糖及天冬酰胺和尿素为最适碳、氮源。在Ｃ／Ｎ为２０／１,葡萄糖浓度为８０ｇ／Ｌ的条件下．油脂产量和油脂中γ－亚麻酸的含量分别为８．２ｇ／Ｌ和１４．１３％,γ－亚麻酸产量及生物量分别为１．１５７ｇ／Ｌ和３１．２ｇ／Ｌ。后期适当降低培养温度和良好的通气条件均有利于γ－亚麻酸的积累。     

被孢霉MA—90发酵生产γ—亚麻酸的研究

本文研究了由被孢霉变株ＭＡ－９０生产了γ－亚麻酸的发酵条件,确定了最适碳源、氮源及Ｃ／Ｎ,初步建立了生产γ－亚麻酸的工艺条件．葡萄糖、蔗糖及天冬酰胺和尿素为最适碳、氮源。在Ｃ／Ｎ为２０／１,葡萄糖浓度为８０ｇ／Ｌ的条件下,油脂产量和油脂中γ－亚麻酸的含量分别为８．５ｇ／Ｌ和１４．１３％,γ－亚麻酸产量及生物量分别为１．．１５７ｇ／Ｌ和３１．２ｇ／Ｌ。后期适当降低培养温度和良好的通气条件均有利于γ－     

红花细胞培养条件的优化及其胞内产物生育酚的

红花（Ｃａｒｔｈａｍｕｓ ｔｉｎｃｔｏｒｉｏｕｓ）的子叶能诱志出愈伤组织,并且该愈伤组织能合成生育酚。正相高效液相色谱测定的结果表明,其主要成分是α－生育酚。在ＭＳ培养基基础上添加０．１％酪蛋白,并将生长调节剂浓度调整为２,４－Ｄ０．３０ｍｇ／Ｌ,６－ＢＡ １．８０ｍｇ／Ｌ,槿使α,β－γ生育酚含量分别达４．１７０６,０．３１２０,０．１６５０μｇ／ｇ鲜重。     

香椿的组织培养和玻璃苗的防止

１植物名称香椿（Ｔｏｏｎａｓｉｎｅｎｓｉｓ）。２材料类别（１）种子发芽３～５ｄ后的下胚轴及带少许下胚轴的子叶;（２）当年生半木质化的腋芽茎段。３培养条件芽诱导及增殖培养,以ＭＳ为基本培养基,蔗糖３０ｇ·Ｌ~（－１）,琼脂０．５％,附加激素（单位ｍｇ·Ｌ~（－１））：（１）６－ＢＡ０．２;（２）６－ＢＡ０．２、ＧＡ_３２．０;（３）ＩＡＡ０．１、６ＢＡ０．２;（４）ＺＴ０．２、ＧＡ_３２．０。诱导生根培养基为１／ＺＭＳ或仅含ＭＳ有机质（铁盐减半）,附加１．０ｍｇ·Ｌ~（－１）ＩＢＡ、１５ｇ·Ｌ~（－１）…     

重组大肠杆菌生产谷胱甘肽发酵条件的研究

研究了重组Ｅ．Ｃｏｌｉ产ＧＳＨ的发酵条件,重点考察了添加酵母膏、前体氨基酸和ＡＴＰ的影响。结果发现,前体氨基酸和ＡＴＰ均能促进胞内ＧＳＨ的积累,若在发酵０ｈ和１２ｈ分别加入２０ｇ／ＬＡＴＰ和９ｍｍｏｌ／Ｌ前体氨基酸,则细胞干重和胞内ＧＳＨ含量可分别比对照提高２４％和１４倍。应用正交试验得出的针对细胞干重和ＧＳＨ总量的最佳组合,最大细胞干重和ＧＳＨ总量比原试验中的最好结果分别提高了１０％和２６％。在分析了该菌对葡萄糖利用情况的基础上,对该菌进行了指数流加培养,２５ｈ细胞干重与发酵液内ＧＳＨ总量分别达到８０ｇ／Ｌ和８８０ｍｇ／Ｌ,比摇瓶最好结果分别提高了８３和４６倍。     

香椿离体快繁技术研究

６～７月取香棒当年生半木质化、具腋芽的茎段为外植体,诱导腋芽萌发,进行繁殖培养。通过大量试验,筛选出各阶段适宜的培养基组成。萌芽诱导阶段培养在ＭＳ＋６－ＢＡ０．２ｍｇ／Ｌ中,腋芽萌发早,生长快;在继代和增殖培养中以ＭＳ＋６－ＢＡ０．２ｍｇ／Ｌ效果较好,ＭＳ＋ＺＴ０．２ｍｇ／Ｌ＋ＧＡ３２．０ｍｇ／Ｌ次之。培养３０天繁殖倍数３．１～４．０,在仅含ＭＳ有机元素。铁盐减半、蔗糖１５ｇ／Ｌ的固体培养基中,附     

大瓶螺凝集素的分离纯化及部分性质研究

大瓶螺蛋白腺经磷酸盐缓冲液抽提、硫酸铵分级沉淀、ＳｅｐｈａｄｅｘＧ－１００和Ｓｅｐｈａｒｏｓｅ４Ｂ凝胶过滤,可获得在不连续ＰＡＧＥ（ｐＨ４．３和ｐＨ８．９）上显示单一蛋白质染色带的大瓶螺凝集素（ＡＧＬ）．该凝集素对人血红细胞无血型专一性,但对Ａ型血红细胞的凝集作用最强．ＡＧＬ的血凝活力可被乳糖或半乳糖所抑制．ＡＧＬ分子中的中性糖含量为０．２４ｍｇ／ｍｇ蛋白质．用ＳＤＳ－ＰＡＧＥ法测得其亚基分子量为１５０００,且只有一种亚基．ＡＧＬ中Ｃｙｓ和Ｐｈｅ的含量较高,并较耐热．     

中麻黄悬浮培养体系的建立

本文用中麻黄无菌苗为外植体,其切段培养在附加２ｍｇ／Ｌ２,４－Ｄ和０．５ｍｇ／Ｌ　６　ＢＡ的ＭＳ培养基上,全部脱分化形成白色疏松愈伤组织。愈伤组织继代培养于ＭＳ＋０．５ｍｇ／Ｌ２,４－Ｄ＋０．２ｍｇ／Ｌ６ＢＡ＋０．２ｍｇ／Ｌ　ＮＡＡ＋４％蔗糖的培养某上。以继代培养愈伤组织为材料进行悬浮培养,培养基为附加０．２ｍｇ／Ｌ２,４－Ｄ＋０．１ｍｇ／Ｌ６ＢＡ＋０．１ｍｇ／ＬＮＡＡ＋２％蔗糖的ＭＳ液体培养基,得到分散性好,细胞形状接近圆形,细胞大小均一,细胞团多由２－３０个细胞组成的悬浮培养体系。第三代悬浮培养细胞增长率为０．３５ｇ·ｆｗ／２０ｍｌ·ｄ,细胞有丝分裂指数为１１．２％。条件培养和高密度接种可缩短延迟期,条件培养不能提高分裂指数,１ｇ／１０ｍｌ接种密度可使分裂指数提高至２１．２％。     

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.