铃兰的胚胎学研究

铃兰（Ｃｏｎｖａｌｌａｒｉａ ｍａｊａｌｉｓＬ．）的花药四室,药壁发育为单子叶型。腺质绒毡层发育后期出现双核至多核。小孢子四分体主要呈左右对称型,偶见四面体型。胞质分裂为连续型。二细胞型花粉。子房三室,中轴胎座。胚珠倒生,双珠被,厚珠心。珠孔由内珠被形成。胚囊发育为葱型和英地百合型。受精以后,在子房壁、珠柄和外珠被细胞中含有草酸钙针晶。胚发育类似于石竹型,但基细胞发生纵裂形成两个子细胞。核型胚乳;合点端具巨形胚乳核     

人RHD基因的克隆和鉴定

目的克隆人RHD基因,并对其进行鉴定。方法以RhD阳性志愿者骨髓为材料,用TRIzol试剂提取总RNA;设计、合成人RHD基因扩增引物,RT-PCR方法扩增RHD基因片段;T／A克隆后将其亚克隆人pET28a（＋）载体中,经酶切、PCR和测序对重组质粒进行鉴定。结果骨髓总RNA被成功提取;RT-PCR成功扩增出RHD基因片段,其大小与预期约509bp基本一致;T／A克隆后再将其亚克隆,通过酶切和PCR证明RHD基因成功亚克隆入pET28a（＋）载体中;基因测序结果比对显示,与已公布的RHD基因（GenBank登录号为NM016124）序列基本一致,同源性为98％。结论成功克隆了RHD基因,这将为进一步研究奠定基础。     

内蒙古地区刺叶柄棘豆(Oxytropis aciphylla Ledeb.)种群遗传多样性分析

用ISSR分子标记对内蒙古地区刺叶柄棘豆(Oxytorpis aciphylla Ledeb.) 5个地理种群进行了种群遗传多样性分析。结果表明：刺叶柄棘豆种群具有较高的遗传多样性,11个ISSR引物扩增出215条带,总的多态位点百分率为98.14%,Shannon多样性指数I=0.2108,Nei基因多样性指数 H=0.341 6,种内总基因多样性(H_t) 为0.2108,种群内基因多样性(H_s)为0.160 4, 大部分遗传变异(76.11%)的遗传变异存在于种群内, 23.89%的遗传变异存在于种群间。遗传分化系数(Gst)为0.238 9,基因流(Nm)为1.592 9。5个居群间已有遗传分化趋势,遗传漂变不会引起遗传分化。UPGMA遗传距离聚类结果表明, 5个地理种群中,植被类型为荒漠草原的4个种群之间遗传距离较近,与1个荒漠种群距离较远。     

Flower-inducing and -inhibiting activities of Phloem Exudate from Cotyledons of Pharbitis Seedlings

The flower-inducing and -inhibiting activities of phloem exudate (PE) prepared from cotyledons of Pharbitis seedlings were examined, using apex cultures in vitro from Pharbitis as a bioassay system.The PE was prepared from photoperiodically-induced cotyledons (SD-PE). The SD-PE was subjected to the following fractionations: When the SD-PE was extracted with CHCl₃ and then ethyl acetate, the inducing activity was located in the final aqueous fraction. The activity was localized in the diffusate when the aqueous fraction was dialyzed (molecular weight cut off was 10,000). The diffusate was fractionated by ion exchange chromatography, and flower-inducing activity was found in the fraction adsorbed onto anion exchange resin. When the fraction was applied to a Sep-Pak C18 cartridge, the activity eluted with 25% MeOH. As a result of the above fractionation, activity was increased about 30-fold.The nature of the flower-inhibiting activity of the PE taken from cotyledons exposed to continuous-light conditions was examined (CL-PE). The inhibiting activity was decreased as the cotyledons were exposed to longer dark periods; it appeared to be heat-stable. The CL-PE also inhibited flowering in Lemna. The CL-PE was subjected to the following fractionations: When the CL-PE was extracted with CHCl₃ and ethyl acetate, activity was located in the final aqueous fraction. Activity was localized in the diffusate when the aqueous fraction was dialyzed (molecular weight cut off was 10,000). When the diffusate was fractionated by ion exchange chromatography, the activity was found in the flow-through fraction. When the fraction was applied to a hydroxyapatite cartridge, the activity eluted with 25 mM sodium phosphate buffer. When the fraction was re-dialyzed (molecular weight cut off was 1,000), the diffusate contained the activity. As a result of the above fractionation, activity was increased about 10-fold.     

逆相蒸发法制备茶多酚脂质体及质量评价

采用逆相蒸发法制备茶多酚脂质体并进行质量评价。通过二次回归旋转组合设计优化茶多酚脂质体制备工艺及配方,对其形态、结构、粒径分布等性质进行考察。研究结果表明,最佳配方为m（大豆卵磷脂）：m（胆固醇）=3：1、茶多酚质量浓度为7mg／mL、V（有机相）：V（水相）=4：1、磷酸盐缓冲液浓度15mmoL／L,此条件下包封率为50．37％;所制备的茶多酚脂质体形态呈圆球形或椭球形,为大单室脂质体,有效粒径为165．3nm,Zeta电位为-69．3mV。逆相蒸发法制备茶多酚脂质体方法简单可行,所制备的脂质体具有一定缓释性。     

Cadaveric study of the arterial anatomy of the upper lip

Arterial distribution of the upper lip was investigated in this study. The location, course, length, and diameter of the superior labial artery and its alar and septal branches were determined on 14 preserved cadaver heads. Another cadaver head was used to show the arterial tree by the colored silicone injection technique. The superior labial artery was the main artery of the upper lip and always originated from the facial artery. The superior labial artery was 45.4 mm in length, with a range from 29 to 85 mm. The mean distance of the origin of the superior labial artery from the labial commissura was 12.1 mm. The superior labial artery was 1.3 mm in external diameter at its origin. The mean distance of origin of the superior labial artery from the lower border of the mandible was 46.4 mm. The alar division of the superior labial artery was mostly found as a single branch (82 percent). Its mean length was 14.8 mm and the mean diameter at the origin was 0.5 mm. The distance between the origins of the superior labial artery and the septal branch was 33.3 mm. The septal branch was single in most of the cases (90 percent). The mean length of the septal branch was 18.0 mm and the diameter at its origin was 0.9 mm. After all dissections, it was concluded that the arterial distribution of the upper lip was not constant. The superior labial artery can occur in different locations unilaterally and bilaterally, with the branches showing variability.     

乌鸡酶解技术研究

采用猪胰脏作为胰酶的主要来源,对乌鸡的酶解工艺进行了研究。实验结果表明：酶反应的最适温度为４５℃,胰酶混合物的合适用量为乌鸡鲜肉重量的５％,反应１８小时达反应平衡,反应浓度以１ｋｇ鲜乌鸡２０００ｍｌ水为宜,反应过程中维持ｐＨ７．３即可,酶解产物经测定：氨基酸及可溶性短肽总含量高达１６．６１％,其中必须氨基酸含量占氨基酸总含量的５３％。     

枯草芽胞杆菌微生态制剂的研制

采用液体发酵工艺,确定枯草芽胞杆菌的最适发酵条件为:发酵温度30℃,初始pH值7.2,并以1%海藻酸钠和3%明胶组成的混合胶体溶液为囊壁材料,以4%氯化钙作固化剂将枯草芽胞杆菌制成微胶囊剂,稳定性试验结果显示经微胶囊包埋的枯草芽胞杆菌制剂,室温下保存1个月,活菌存活率为98.8%,保存3个月,活菌存活率为50.6%,保存6个月,活菌存活率为15.7%,均高于未经微胶囊化的样品;在4℃冷藏下保存3个月,未经微胶囊化的样品活菌存活率仅为经微胶囊包埋制剂的66.2%。该微胶囊制剂提高了活菌存活率,延长了活菌常温保存期。     

In vitro palmitoylation of native bovine brain Goα

The native Goα was purified from bovine brain cortex and palmitoylated in vitro. The in vitro palmitoylation site was the same as that in vivo. The internal palmitoylation of purified native Goα was found to be largely maintained. The apparant palmitoylation ratio was significantly increased after the Goa was treated with DTT. The GTPg S binding characteristic of Goα was not influenced by palmitoylation, however, the affinity for LUVs was increased dramatically. The in vitro palmitoylation model of Goα provides a better basis for studying the functional role of G protein palmitoylation in signal transduction.     

表达人胰高血糖素样肽前药工程菌遗传稳定性

通过传代培养的方法,研究高表达重组人胰高血糖素样肽前药(Pro-rhGLPs)的工程菌E.coliBL21(DE3)/pET41a(+)-hGLPs的遗传稳定性,观察菌体和菌落形态,比较在有无选择压力下的质粒稳定性,酶切和测序鉴定重组基因片断的正确性,SDS-PAGE电泳证实重组蛋白质的表达量的稳定性,在C57BL/6小鼠上进行葡萄糖耐量实验检测重组蛋白生物学活性。结果显示:此工程菌连续传代过程中,保持大肠杆菌的典型特征,各代质粒的酶切鉴定和测序正确,重组蛋白表达水平及生物活性也无显著差异。因此,工程菌E.coliBL21(DE3)/pET41a(+)-hGLPs具有良好的遗传稳定性。     

穴居狼蛛毒中一个抗菌活性多肽的鉴定和纯化

从我国新疆地区产穴居狼蛛的毒液中分离纯化了一种多肽——狼蛛抗菌肽(Lycosin)。穴居狼蛛的粗毒在酸性聚丙烯酰胺凝胶电泳中可分出11条蛋白带,用0.6％的大肠杆菌琼脂胶覆盖在凝胶上进行鉴定表明,电泳迁移率最快的区带有抗菌活性。经鉴定该多肽分子系由43至45个氨基酸残基组成,N-末端为丙氨酸,分子中的碱性和疏水性氨基酸分别占总氨基酸残基数的1/4和1/3。     

小玉竹的胚胎学研究

小玉竹Polygonatum humile Fisch．ex Maxim．的花药四室．绒毡层腺质型,发育后期出现双核至多核。小孢子四分体左右对称型,偶见四面体型,胞质分裂连续型。成熟花粉具2细胞。子房3室,中轴胎座。胚珠倒生,双珠被,厚珠心,珠孔由内珠被形成。胚囊发育为葱型。受精后,子房壁和外珠被细胞中含有草酸钙针晶。胚发育类似于紫菀型,基细胞有时纵裂形成两个子细胞。胚乳核型。根据实验结果,并结合前人的资料,本文提出了黄精属的胚胎学特征,并在此基础上对黄精族的概念以及属间系统关系进行了探讨。     

β-葡萄糖苷酶在酿酒酵母表面的表达

应用表面表达技术对来自Trichodermareesei的β-葡萄糖苷酶在酿酒酵母表面的表达及后期性质进行了研究。实验结果表明酵母表面表达酶有活性,该酶的最佳诱导时间为24h,最适温度是70℃,而酶活的最适pH是5．5。使异源表面表达了Bgl1的酵母在以纤维二糖为唯一碳源的培养基中生长,发酵结果表明纤维二糖被明显利用了,但在培养186h后,发酵液中仍残留一定量的纤维二糖。这种技术对纤维素发酵系统中纤维二糖酶活性低的现状有所帮助。     

白腐菌紫外诱变选育高产漆酶突变株及其产酶条件研究

以白腐菌为出发菌株,利用紫外线(UV)进行诱变,筛选高产漆酶突变菌株。通过测定致死率绘制出发菌株的致死曲线,采用PDA-RBBR平板变色法进行初筛,ABTS检测酶活对突变株进行摇瓶复筛。结果表明:利用15 w紫外灯在照射距离为30 cm,照射时间为120 s,致死率为72.1%的条件下进行诱变处理,获得一株高产菌株,其酶活提高79.54%,经过5代传代培养,未见酶活下降,具有较好的遗传稳定性,进一步研究了初始pH值,接种量和培养基装液量等对诱变菌株产酶的影响,结果表明在最佳的培养条件pH值6.0,15%的装液量于28℃下,酶活达214.9 U/L。     

人肝谷胱甘肽过氧化物酶纯化及性质研究

经硫酸铵分级沉淀,离子交换层析和凝胶过滤等步骤,从人肝中获得了ＰＡＧＥ单一条带的谷胱甘肽过氧化物酶,比活提高１２０倍,得率为２５％。凝胶过滤法测得分子量为９０９８０,ＳＤＳ－ＰＡＧＥ测定亚基分子量为２２４２３．原子吸收法测得每分子酶含有四个硒原子。等电聚焦显示该酶等电点为５．０．酶活力的最适ｐＨ为８．５,最适温度为３７℃。动力学实验提示该酶作用机理属于乒乓机制型。     

Amperometric determination of choline with use of immobilized choline oxidase

Choline oxidase (choline: oxygen oxidoreductaserpar; was immobilized on a partially aminated polyacrylonitrile membrane. The enzyme electrode, consisting of an immobilized-enzyme membrane and an oxygen probe, was employed for the determination choline. Dissolved oxygen consumption by the enzymatic reaction was measured amperometrically. The rate assay method was used for the choline determination. The response time of the sensor was 7 sec for choline. The choline assay was done within 1 min. The choline calibration curve was linear from 0 to 0.1mM. The response was reproducible within an average relative error of 2.3% when 0.2mM choline was employed for experiments. The choline in the fermentation media was determined by the sensor. Furthermore, phospholipids in the serum were also determined with native phospholiphase D and the enzyme electrode.     

小蜡果皮水溶性色素的提取及光敏感性

以去离子水和不同体积分数乙醇从小蜡果皮中浸提红色素,用光谱扫描法检测该红色素的光吸收特性,比较不同浸提时间及不同体积分数乙醇对浸提效果的影响,并用暴露方式进行光敏感性测定。结果显示,小蜡果皮色素在纯水中的溶解性最好,属水溶性色素,延长浸提时间可提高色素的浸出率,但杂质质量分数也随之提高,紫外线对色素的色度影响最大,直接照射可使色素的色度大幅度下降。     

内切葡聚糖酶基因在巨大芽孢杆菌中的表达及其酶学性质研究

通过PCR方法将已克隆的内切葡聚糖酶基因(GenBank No. DQ782954)信号肽编码序列去除, 然后与表达载体pHIS1525连接后转化大肠杆菌DH5a, 筛选出阳性转化子DH5 a -pHIS1525-G7并提取质粒进一步转化巨大芽孢杆菌WH320原生质体, 获得基因工程菌WH320-pHIS1525-G7。刚果红染色和SDS-PAGE分析表明该基因在巨大芽孢杆菌中得到了有效表达。基因工程菌经优化培养后, 胞外上清液中的酶活力可达889 U, 是出发菌株(即枯草芽孢杆菌C-36)的11.22倍。酶学性质研究表明: 该酶的最适反应温度与pH值分别为65℃与pH 6.0, 在pH 4.5~10.0范围内50℃保温30 min可保持在最高酶活的80%以上。     

维甲酸核受体RARα真核表达载体的构建、突变纠正及表达

目的构建维甲酸核受体RARα真核表达载体,并检测其在人肺腺癌细胞A549中表达。方法从小鼠巨噬细胞RAW264.7中提取总RNA,以RT-PCR法扩增RARαcDNA,克隆至真核表达载体pDsRed1-C1中,测序结果显示RARα第1040位A→G,导致其编码蛋白的氨基酸发生改变。通过二次PCR将其纠正,重组载体RedC1-RARα转化大肠埃希菌Top10,筛选阳性克隆做酶切及测序鉴定。脂质体瞬时转染A549细胞,在荧光显微镜下观察RARα的表达。RT-PCR法检测RARα的mRNA水平表达。结果通过RT-PCR及二次PCR得到RARαcDNA,构建其真核表达载体,脂质体瞬时转染A549细胞得到了成功表达,RARα基因产物定位于细胞核内。结论成功构建维甲酸核受体RARα真核表达载体,且证实RARα编码蛋白定位于细胞核内,本研究结果为进一步探讨结核分枝杆菌固有免疫机制奠定了基础。     

Purification and properties of thiosulfate dehydrogenase from Acidithiobacillus thiooxidans JCM7814

A key enzyme of the thiosulfate oxidation pathway in Acidithiobacillus thiooxidans JCM7814 was investigated. As a result of assaying the enzymatic activities of thiosulfate dehydrogenase, rhodanese, and thiosulfate reductase at 5.5 of intracellular pH, the activity of thiosulfate dehydrogenase was measured as the key enzyme. The thiosulfate dehydrogenase of A. thiooxidans JCM7814 was purified using three chromatographies. The purified sample was electrophoretically homogeneous. The molecular mass of the enzyme was 27.9 kDa and it was a monomer. This enzyme had cytochrome c. The optimum pH and temperature of this enzyme were 3.5 and 35 degrees C. The enzyme was stable in the pH range from 5 to 7, and it was stable up to 45 degrees C. The isoelectric point of the enzyme was 8.9. This enzyme reacted with thiosulfate as a substrate. The Km was 0.81 mM.