兔子宫内膜蛋白等电聚焦电泳柱状胶与板状胶电泳效果的比较

哺乳动物早期胚胎发育过程中，胚泡附植的成功与否对早期胚胎的发育十分重要．为了有效地弄清胚泡附植的分子机制，本研究从分析蛋白质的一种生化技术-等电聚焦电泳着手，利用兔子宫内膜蛋白作为实验材料，探讨了柱状胶与板状胶等电聚焦电泳分离蛋白质的电泳效果．研究结果表明：在相同情况下，柱状胶与板状胶的蛋白质分布有一些差别，pH梯度分布也不一致；板状胶比柱状胶pH值分布宽、蛋白质谱带多、分辨率高；板状胶酸性端只有1—2cm没有蛋白带、蛋白带分布比较均匀且压得比较紧．这说明在用子宫内膜作为实验材料进行电泳时用板状胶进行电泳的结果较好．     

沙地云杉生态型同工酶研究

沙地云杉是内蒙古地区特有树种,只分布于浑善达克沙地东部边缘;由于长期适应干旱生态条件,分化出3种土壤生态型,即紫果型、红果型和绿果型沙地云杉,并在很多生态、生理特征上表现出明显的差异.本文采用聚丙烯酰胺凝胶电泳技术,分析了3种生态型沙地云杉的过氧化物同工酶和酯酶同工酶的酶谱特征.结果表明:不管是过氧化物同工酶还是酯酶同工酶,紫果型沙地云杉的酶带条数最多,红果型其次,绿果型酶带条数最少.在酶带强度方面也有类似的结果,紫果型沙地云杉具有较多的强、次强、中带,红果型其次,绿果型最少.这在一定程度上表明,在干旱条件下产生的3种不同生态型沙地云杉,以紫果型对干旱抗性最强,绿果型最弱,红果型居于二者之间,这一结论将为沙地云杉的经营管理及品种选择提供科学依据. 图2参21     

Effects of arsenic on seed germination and physiological activities in wheat seedlings

The effects of arsenic(As)were investigated on seed germination,root and shoot length and their biomass and some other factors to elucidate the toxicity of As.The results showed low concentrations of As(O-1 mg/kg)stimulated seed germination and the growth of root and shoot,however,these factors all decreased gradually at high concentrations of As(5-20 mg/kg).The contents Of O2-,MDA,soluble protein and peroxidase(POD)activity all increased with increasing As concentrations.Soluble sugar content,ascorbate peroxidase(APX),and superoxide dismutase(SOD)activities decreased at low concentrations of As,and increased at high concentrations of As.While acetylsalicylic acid(ASA)and chlorophyll contents,catalase(CAT)activity displayed increasing trend when the concentrations of As was lower than 1 mg/kg,and then decreasing trend.By polyacrylamide gel electrophoresis(PAGE).As induced the expression of POD isozymes of wheat seedlings.As induced the expression of CAT isozymes but inhibited the expression of SOD isozymes of wheat seedlings at concentrations lower than 1 mg/kg.However,As inhibited the expression of CAT isozymes but induced the expression of SOD isozymes at concentrations higher than 5 mg/kg.The results indicated As could exert harmfulness in the early development stage of wheat at inappropriate concentrations.     

性畸变疣荔枝螺体内总蛋白和酯酶同工酶的比较研究

通过运用统计学和垂直板型凝胶电泳(PAGE)的方法.对受三丁基锡污染的海洋腹足类动物疣荔枝螺群体的性畸变率(101)和种群的性别比例(SR)进行统计计算,并且对疣荔枝螺雄性、雌性及性畸变个体体内的总蛋白、酯酶同工酶进行研究.结果表明.三丁基锡污染能导致疣荔枝螺群体的101大幅度提高,SR减小.同时,总蛋白电泳和酯酶同丁酶结果显示,性畸变螺体体内蛋白表达量和酯酶活性趋向于与雄螺螺体相近,提示三丁基锡是导致雌性疣荔枝螺发生性畸变的主要原因,并且在蛋白表达水平上对性畸变螺体产生严重影响,使其蛋白表达量和酯酶活性趋向于与雄螺螺体相近.     

兔子宫内膜蛋白等电聚焦电泳载体两性电解质pH范围及比例的选择

兔子宫内膜蛋白是研究早期胚胎发育过程中胚泡附植机制的关键因素之一．为了对子宫内膜蛋白进行有效的分离，本研究探讨了用于等电聚焦电泳的载体两性电解质pH范围及其比例．研究结果表明：在只有pH3～9．5的情况下，蛋白质谱带主要分布于胶条碱性端1／3区域，酸性端无谱带；在载体两性电解质pH3-9．5：pH4～6=1：4的情况下，蛋白质谱带主要分布于胶条碱性端2／3部分；在载体两性电解质以pH3-9．5：pH4～6：pH6—9=1：4：1时，蛋白质谱带分布比较均匀，酸性端也有谱带分布．这说明在作子宫内膜蛋白的等电聚焦电泳时采用pH3～9．5：pH4～6：pH6～9=1：4：1比较理想．     

Binding of aluminum to human serum transferrin,human serum albumin and rat serum proteins

Abstract

Human serum transferrin (HSTF), human serum albumin (HSA) and rat serum were compared for their interaction with AlCl₃ , in a Tris‐HCl buffer solutions (pH 7.4). The AlCl₃ was tested in series of concentrations in the range of 50 μM up to 500 μM . HSTF, HSA and their 1:1 mixture and rat serum were incubated at 37°C with series of AlCl₃ concentrations. The protein profile of the incubated solutions were compared to control using SDS‐PAGE and FPLC tests. The results indicated that HSTF was more specifically responsive to AlCl₃showing a characteristic increase in its UV absorption, peak and area dimensions. Simultaneously, HSA was less affected, but it showed a significant shift with an increase in molecular weight accompanied with a change in its profile. The respective bands of transferrin and albumin in rat serum behaved similarly. The SDS‐PAGE and FPLC data coincided and confirmed the preferential affinity of HSTF to bind with Al³⁺ . These results support the suggestion of using HSTF for monitoring levels of Al³⁺ in human blood samples of exposed population. The importance of further developing such a biomarker is the increased demand for early detection of the hazardous levels of Al³⁺ in relation to its long term neurotoxic adverse effects.