粘质沙雷氏菌（Serratia marcescens）的研究I-Serratia marcescens9—2菌株分离、分类鉴定和形态特征

9—2菌株为革兰氏阴性短杆菌，周生鞭毛，菌落红色，经自动微生物鉴定系统(VITECK—AMS—CC2)鉴定9—2菌株为粘质沙雷氏菌(Serratia marcescens)，鉴定为99％；9—2菌株对丁氨卡那、强力霉素、复方新诺明、氟哌酸和庆大霉素敏感，对卡那霉素中敏，对呋喃唑酮、头孢唑啉、氯霉素、链霉素、呋喃妥因、红霉素、青霉素G、氨苄青霉素和四环素不敏感；能产生灵杆菌素．     

N-terminal of L protein of vesicular stomatitis virus contains a new signal sequence

The L protein (241kD) of vesicular stomatitis virus (VSV) is the most important snbnnit of the replication complex. The existence of specific localization signal in the L protein was investigated by making recombinant constructs expressing truncated mutants of the L protein fused to green fluorescent protein (GFP) in transient transfection assays. The chimeric genes encoding varied N-terminal of L and GFP gene were put under the control of T7 promoter or CMV promoter. The fusion proteins were transiently expressed in BHK-21, COS-7, CHO or Hep G2 cells. When more than 120 residues were deleted or only 96 residues were kept on the N-terminal, the fusion proteins were shown to be distributed throughout the cells, cytoplasm and nucleus under the confocal microscope. However, other chimeric proteins with 120 or more amino acids were dotted and distributed in the perinuclear regions. And the fusion protein with 96—120 aa has the similar distribution. A thirteen-residue peptide QGYSFLHEVDKEA (108—120) was identified as localization signal, whose function would be absolutely distributed with the deficiency of D or V. Our results show that there is an independent localizing signal in N-terminal domain of L protein of VSV and this functional signal is conserved in different cell lines.     

Inhibitory effect of the adenovirus type 5 E1A protein expressed in the yeast system of the human tumor cell growth

Adenovirus 5 type E1A as a tumor suppressor gene can inhibit tumor growth and enhance the censitivity of chemotherapy and radiotherapy.E1A have the ability to integrate into the host genome,resulting in long-time expres-sion that induces Rb gene inactivation and animal cells im-mortalization.This prompted us to select the E1A protein for treatment of cancer in order to overcome the limitations of E1A gene therapy.Thus,we firstly comstructed E1A eu-caryotic expression vector (pPIC9/E1A),transformated the pichia pastoris yeast cells(GS115) and screened the high-expressing recombinant strains.The positive yeast strains were cultured in the shake flask,and induced for 3d.The crude E1A protein was purified using two steps of col-umu chromatography on HiTrap Q and HiTrap SP.The pu-rified E1A protein was identified by SDS-PAGE and Western blot.E1A protein was mostly located at cellular unclear when Cheriot delivered E1A protein into cells.The analysis in vitro indicated that the E1A protein arrested LN686 cell cycle at G2/M phase,and significantly inhibited the growth of LN686 tumor cells.The current studies firstly provided an experimental basis to further develop E1A protein for tumor treatment.     

4种氨基酸燃烧热的精密测定

用精密转动弹热量计测定了L-色氨酸、L-白氨酸、L-异白氨酸和L-丙氨酸的燃烧能,计算出它们的标准燃烧焓ΔcHθm分别依次为(-5575.83±3.99),(-3558.81±4.81),(-3569.32±8.33),(-1595.36±1.42)kJ/mol和标准生成焓ΔfHθm分别依次为(-467.76±4.25),(-660.14±4.88),(-649.64±8.37),(-585.58±1.48)kJ/mol。认为此结果比文献值更可靠。     

新疆北鲵肌肉蛋白质、氨基酸、无机元素及食物组成分析

本报道了新疆北鲵肌肉蛋白质含量为19．08％，氨基酸17种，无机元素有Ca等6种，成幼体食物组成中以石蚕及腺状介虫为主．     

我国的名优特稻米(二)

色稻在国栽培历史悠久。由于稻谷上裹着天然色素(主要是水溶性花青素)，而使稻米呈现各种天然颜色，有乌黑、紫红、红褐、红色、黄色、绿色、咖啡色、褐色等等。色稻营养丰富，富含蛋白质和人体必需的氨基酸、不饱和脂肪酸、维生素、纤维素等。特别是铁和B族维生素含量要比普通大米高得多。     

高效液相色谱-抑制化学发光法检测药物中的扑热息痛

基于扑热息痛对鲁米诺铁氰化钾化学发光体系的抑制作用,采用HypersilC18色谱柱分离、抑制化学发光法检测了药物中的扑热息痛含量.扑热息痛浓度在8 0×10-7～1 6×10-5g/mL范围内与化学发光强度呈良好的线性关系,检测限(3σ)为7 4×10-8g/mL,方法的相对标准偏差为3 4%.该方法已成功应用于扑热息痛片、散利痛和维C银翘片中扑热息痛含量的测定.     

二甲苯蓝FF与蛋白质相互作用的分光光度研究

在pH1 7～2 8的弱酸性介质中,二甲苯蓝FF与牛血清蛋白、人血清蛋白、卵白蛋白、α 糜蛋白酶等作用形成结合产物时将导致吸收光谱发生变化,在390nm处产生明显的褪色作用,而在560nm附近吸光度增强,其ΔA值均与蛋白浓度成正比,根据蛋白质的不同分别在0～60mg/L或0～80mg/L范围内符合Beer定律,不同蛋白质的表观摩尔吸光系数在2 8×105至1 3×106之间.据此,建立了一种测定蛋白质的双波长叠加分析法.该法应用于血清蛋白样品中总蛋白质的质量分析,回收率在98 7%～102 9%范围内.     

黄颡鱼人工繁殖的初步研究

利用面积为2000m^2的鲫鱼池套养培育黄颡鱼亲鱼；采用不同的药物和剂量进行人工催产；利用家鱼孵化池进行流水孵化。实验结果表明：黄颡鱼在性成熟度基本一致的情况下，用LRH—A2 DOM PG(LRH—A2、DOM、PG分别为4ug、0．8mg、2．2mg)的配合药物来进行生产，催产率可达到95％。