国产色谱柱在复方氨基酸输液含量测定中的应用研究

运用两种国产色谱柱检测复方氨基酸注射液中各氨基酸的含量,分别建立了分离检测方法,优化了梯度洗脱的条件。在waters和agilent的高效液相仪上,两个厂家的色谱柱均显示出较好的分离效果。结果表明国产色谱柱能经济有效的达到质量控制的目的,可以推广使用。     

羊松果体细胞原代培养及其生物学特性的研究

体外培养山羊及绵羊的松果体细胞,观察其增殖情况和功能状态的变化.结果显示:山羊、绵羊的松果体细胞体外形态及生长情况相似.细胞多呈圆形或多角形,细胞体积有增大趋势.采用MTT法检测细胞生长状态,发现细胞有明显的增殖现象,大约于11d达到高峰.用免疫组织化学对培养细胞进行染色,发现5-HT阳性细胞数量随细胞的增殖而增加.表明山羊和绵羊松果体细胞在体外均增殖旺盛,并能保持体内的分泌功能.     

植物激素对砀山酥梨脱病毒苗增殖生长的影响

砀山酥梨脱病毒苗培养基中添加外源激素能通过调节内源激素的含量,从而控制脱病毒苗的增殖和生长。苄基腺嘌呤(benzyladen ine,BA)处理可提高脱病毒苗内源玉米素核苷(zeatin riboside,ZR)含量,而脱病毒苗的有效增殖芽数与IAA/ZR比值呈显著负相关;1萘-乙酸(1-naphthalene acetic ac id,NAA)处理可显著提高内源吲哚乙酸(indole acetic ac id,IAA)含量,较高的内源IAA含量有利于芽梢的生长;继代组培苗体内含有一定量的内源赤霉素(G iberllic Ac id,GA1 3),适量的外源GA3处理,可提高内源GA1 3含量而显著降低脱落酸(absc isic ac id,ABA)含量,促进芽梢的伸长和叶面积的扩大。     

巴尔通体分离培养特性观察

从鼠类血液中分离巴尔通体(Bartonella),观察其分离培养特性。被检鼠血为2004年收集自云南省的4个县,采用含5%去纤维兔血脑心浸液琼脂培基置于35℃含5%CO2培养箱中分离培养巴尔通体,进行观察,涂片革兰染色镜检,疑似菌落用巴尔通体属特异性引物进行聚合酶链反应(PCR)扩增特异基因片段[枸橼酸合酶基因(gltA)的379 bp片段],电泳图中出现目标带即判断为阳性菌株。从397份鼠血分离到巴尔通体47份,分离率为11.8%。阳性菌落长出时间最早为3 d,多数为1~2周,占70.2%(33/47)。阳性菌落形态随培养时间延长而改变,特点多样。PCR阳性的菌经革兰染色,镜下均可见革兰阴性小杆菌。结果可见,可先用涂片革兰染色镜检,对疑似菌落进行初筛,巴尔通体种类多、形态多样,培养时间延长,菌落形态可能发生变异,有待进一步探索。     

引入CpG基序的汉滩病毒G2糖蛋白基因的克隆及表达

构建汉滩病毒G2糖蛋白的真核表达载体,并加入可增强小鼠免疫刺激作用的CpG基序,检测其可否在真核细胞中表达。参照Genebank中汉滩病毒M的全基因序列设计引物,引物两端引入可增强小鼠免疫刺激作用的CpG基序及双酶切位点,通过聚合酶链反应(PCR)获得含CpG基序的G2片段,并将其与T载体pMD18-T相连,测序后克隆至真核表达载体pcDNA3.1 上,将此真核表达载体以脂质体法转染至真核细胞Vero-E6中,利用间接免疫荧光法(IFA)检测发现转染后的Vero-E6中出现特异性的绿色荧光。结果表明本实验成功构建了汉滩病毒包膜糖蛋白G2的重组体。     

核酸疫苗双表达载体的构建及表达

将微小病毒内部核糖体进入位点(IRES)基因克隆到质粒pVAXI载体多克隆位点,构建出核酸疫苗双表达载体pVI。将绿色荧光蛋白(EGFP)基因和新霉素磷酸转移酶(neor)基因作为报告基因,连接到pVI载体IRES基因的前后两处多克隆位点,构建出表达载体pEIN。通过脂质体介导的方法将该载体转染COS-7细胞,筛选到同时表达绿色荧光蛋白和新霉素磷酸转移酶的表达株,表明成功地构建了核酸疫苗双表达载体,为构建多价核酸疫苗及带有分子佐剂的核酸疫苗打下了基础。     

碳酸酐酶Ⅱ及其抑制剂研究进展

碳酸酐酶Ⅱ是一种活性中心含有Zn^2＋、能催化CO＋H2O-HCO3-＋H^＋反应的金属酶。它广泛分布于人体多种组织、器官中,与人体酸碱平衡、青光眼、骨质疏松症、癌症等多种生理或病理过程密切相关,多年来一直备受关注。自从1992年高分辨率的碳酸酐酶Ⅱ晶体结构测定以来,其抑制剂研究发展较快,已有活性好、选择性强的抑制剂作为新药应用于临床。本文以碳酸酐酶Ⅱ结构、功能和抑制剂研究为重点,主要介绍近15年来该领域研究的一些重要进展。     

峨眉双蝴蝶组织培养与快速繁殖(简报)

峨眉双蝴蝶植株带芽茎段的最佳芽诱导培养基为MS＋6-BA 1.5mg／L;在1／2MS＋IBA 1.0培养基上可诱导出根,生根率96％以上;生根苗经炼苗后移栽成活率在89％以上。     

Invasive alien plants in China: role of clonality and geographical origin

Biological invasions have become a significant threat to the global environment. Unfortunately, to date there is no consensus on invasion mechanisms and predictive models. Controversies range from whether we can reliably predict which species may become invasive to which species characteristics (e.g., life history, taxonomic groups, or geographic origin) contribute to the invasion processes. We examined 126 invasive alien plant species in China to understand the role of clonality and geographical origin in their invasion success. These species were categorized into three groups (I, II, III) based on their invasiveness in terms of current spatial occupation and the degree of damage to invaded habitats. Clonal plants consisted of almost half (44%) of the 126 invasive species studied, and consisted of 66% of 32 the most invasive alien plant species (Group I). There was a significant positive relationship between clonality and species invasiveness. A 68% of the 126 species studied originated in the continent of America (North and/or South America). These preliminary findings support that America is the primary geographical origin of invasive alien plant species in China and that clonality of the invasive plant species contributed significantly to the their invasiveness. The results suggest an urgent need at the global scale to investigate the mechanisms whereby plant clonal growth influences plant invasions, and the need for a focus at regional scale to examine factors affecting the exchange of invasive plant species between America and China.     

Cutaneous and Mucosal Phaeohyphomycosis Caused by Exophiala spinifera in a Pregnant Patient: Case Report and Literature Review

We report a case of mucocutaneous phaeohyphomycosis caused by Exophiala spinifera. Crusty plaques and nodules were major clinical features. Histological examination revealed brown yeast-like cells and hyphae. Mycological and molecular data identified E. spinifera as etiologic agent. Oral itraconazole was effective, which was in accordance with the results of in vitro susceptibility testing. We speculated that her pregnancy may play a role of risk factor in the infection by E. spinifera.