鳞翅目昆虫细胞抗菌肽的诱导、筛选及抗菌活性的研究

选取3种离体培养的鳞翅目昆虫细胞系,采用热灭活的大肠杆菌诱导的方法,诱导其产生抗菌肽,并进行抗菌活性检测、诱导动力学研究及Tricine SDS-聚丙烯酰胺凝胶电泳检测分析．结果筛选到1株诱导抗菌活性较高的昆虫细胞系——粉纹夜蛾BTI-Tn-5B1细胞系,并发现该粉纹夜蛾5B1细胞在诱导后16h产生了1个分子量大约为8000的抗菌肽,抗菌活性检测表明其对金黄色葡萄球菌（Sta phylococcus aureus）、大肠杆菌（Escherichia coli K12D31）、德氏卑沙门氏菌（Salmonella derby）均有不同程度的抑制作用,其中特别是对革兰氏阴性菌——大肠杆菌K12D31和德氏卑沙门氏菌有较强的抑菌活性．     

Bitter peptides and bitter taste receptors

Bitter peptides are a structurally diverse group of oligopeptides often generated in fermented, aged, and hydrolyzed food products that make them unfavorable for consumption. Humans perceive bitterness by a repertoire of 25 human bitter receptors, termed T2Rs. Knowledge of the structural features of bitter receptors and of the factors that stimulate bitter receptors will aid in understanding the mechanism responsible for bitter taste perception. This article reviews the current knowledge regarding structural features of bitter peptides and bitter taste receptors. Received 24 November 2008; received after revision 11 December 2008; accepted 16 December 2008     

Apolipoprotein M affecting lipid metabolism or just catching a ride with lipoproteins in the circulation?

Apolipoprotein M (apoM) is a novel apolipoprotein found mainly in high-density lipoproteins (HDL). Its function is yet to be defined. ApoM (25 kDa) has a typical lipocalin ?-barrel fold and a hydrophobic pocket. Retinoids bind apoM but with low affinity and may not be the natural ligands. ApoM retains its signal peptide, which serves as a hydrophobic anchor to the lipoproteins. This prevents apoM from being lost in the urine. Approximately 5% of HDL carries an apoM molecule. ApoM in plasma (1 μM) correlates strongly with both low-density lipoprotein (LDL) and HDL cholesterol, suggesting a link to cholesterol metabolism. However, in casecontrol studies, apoM levels in patients with coronary heart disease (CHD) and controls were similar, suggesting apoM levels not to affect the risk for CHD in humans. Experiments in transgenic mice suggested apoM to have antiatherogenic properties; possible mechanisms include increased formation of pre-? HDL, enhanced cholesterol mobilization from foam cells, and increased antioxidant properties. Received 28 November 2008; received after revision 15 December 2008; accepted 16 December 2008     

The Function and Development of Soybean Peptides

Soybean peptides are small molecules hydrolyzed soy protein, from three to six amino acid composition of the peptide mixture, inl000Da molecular weight below.Because it has a lot of good physical and chemical properties and physiological functions, in many areas has been widely used. This paper reviews the soybean peptide physical and chemical characteristics, physiological functions, technology and applications in the food industry.     

目前内分泌研究进展

本文对传统内分泌腺之外的一些细胞和组织的内分泌功能作一概述，其中包括神经内分泌，胃肠道内分泌，血循环系统内分泌，免疫细胞内分泌及排泄系统内分泌，研究表明，人体所有的细胞事实上都具有产生激素的共同基因，都有合成和分泌激素的能力，只是他们在不同细胞表达的方式和数量不同而已。人们预言，内分泌功能是一切生命细胞最基本的特征之一，所有的细胞都具有内分泌功能。     

石刀柏花药离体培养若干因素的探讨

本文报道了芦笋（石刀柏）（ＡｓｐａｒａｇｕｓｏｆｆｉｃｉｎａｌｉｓＬ．）花药离体培养中不同品种、不同激素配比等因子的影响．结果表明：（１）芦笋不同品种的愈伤组织诱导率存在显著差异（Ｐ＜０．０１）．５个品种中，以ＵＣ３０９为最高达２６．５％，ＵＣ１５７为最低仅７．１％．（２）在同一培养基上，不同激素配比对器官分化的影响是明显的．认为ＮＡＡ和６－ＢＡ为１：１配比时，对愈伤组织的器官分化是适宜的．     

含丝氨酸残基手性肽核酸单体的合成

对文献合成方法进行了改进．以N—Boc氨基酸与自制甲烷磺酸酯反应，制备N—Boc氨基酸丙烯酯，以混合酸酐法实现关键中间体与1-胸腺嘧啶乙酸的缩合，总收率为26．4％，比文献方法提高了12％，成本降低，制备了含丝氨酸残基碱基为胸腺嘧啶的手性肽核酸单体．     

Fn和RGD对人支气管上皮细胞损伤修复的影响

为探讨纤维连接蛋白(Fn)、精-甘-天冬氨酸肽(RGD)对人支气管上皮细胞(BEC)损伤修复的影响,用永生化人BEC进行培养,将培养细胞分为7组:1.对照组;2.臭氧(O3)应激组;3.O3 EGF组;4.O3 Fn组;5.O3 RGD组;6.O3 Fn 钙调素抑制剂W7组;7.O3 Fn 蛋白酪氨酸激酶抑制剂Genestin组,分别测定各组的损伤修复指数(RI),利用计算机图像分析软件对数据进行处理和比较.结果发现O3应激组的损伤修复指数显著低于对照组(P<0.01),O3 EGF组、O3 Fn组和O3 RGD组损伤修复指数则显著高于O3应激组(P<0.01),Fn的促损伤修复效应可被W7和Genestin阻断(P<0.01).该实验表明EGF,Fn和RGD对BEC的损伤后修复有保护作用,Fn的作用机制可能与酪氨酸磷酸化途径和钙调素途径有关.     

植物激素对蒙古扁桃种子萌发的影响

用赤霉素(GA3)、生长素(NAA)、细胞分裂素(6-BA)和乙烯利对蒙古扁桃种子进行浸种处理,探讨不同植物激素对蒙古扁桃种子萌发的影响.实验结果表明,10mg·L-1GA、0.1mg·L-1NAA、1.0mg·L-16-BA、0.01mg·L-1乙烯利对蒙古扁桃种子的萌发具有促进作用.     

Candidate Multi-Peptide-Vaccine Against Classical Swine Fever Virus Induces Strong Antibody Response with Predefined Specificity

IntroductionClassical swine fever virus(CSFV) is a pestiviruswhich causes significantmortality and morbidity inpigs.An epidemic of CSFV in a high pig densityarea can result in devastating financial losses,because few infected pigs can be effectively cured.In many countries in Europe and Asia,classicalswine fever (CSF) is controlled by vaccinationwith commercially available vaccine strains,suchas the Chinese vaccine strain(C-strain,i.e.,hogcholera lapinized virus) orsome modified-live vir…