共查询到20条相似文献,搜索用时 125 毫秒
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[目的]为降低氟吗啉的使用剂量,提高药效,降低抗药性风险,研究4种生物活性物质壳寡糖、鼠李糖脂、菌株SY-FX-69发酵液、菌株YD-14发酵液对氟吗啉的增效作用。[方法]通过对黄瓜霜霉病的室内生物活性测试,确定该4种活性物质对氟吗啉的增效效果。[结果]供试活性物质中的壳寡糖、菌株SY-FX-69发酵液、菌株YD-14发酵液对氟吗啉均有不同程度的增效作用,其中以活性菌种YD-14及SY-FX-69发酵液增效作用最为明显。[结论]YD-14及SY-FX-69发酵液同氟吗啉共同使用能增加氟吗啉对黄瓜霜霉病的防效,并能促进黄瓜植株的生长。 相似文献
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《中国生物制品学杂志》2017,(1)
目的评价甘露寡糖修饰布氏菌Rsα蛋白的生物活性。方法经1-乙基-3-(3-二甲基氨丙基)碳二亚胺(EDC)/N-羟基琥珀酰亚胺(NHS)化学偶联法,用4种甘露寡糖(甘露三糖、甘露四糖、甘露五糖及甘露六糖)对Rsα蛋白按不同摩尔比进行寡糖修饰。FITC荧光标记4种甘露寡糖修饰Rsα蛋白后,作用于RAW264.7细胞,荧光显微镜观察细胞对荧光的吞噬情况;流式细胞术检测细胞对蛋白的吞噬率。结果甘露寡糖与蛋白投料摩尔比达1 000∶1时获得的反应产物较稳定。甘露五糖修饰的Rsα蛋白被巨噬细胞吞噬的速度最快,其细胞吞噬率最高(25.89%)。结论筛选出五糖修饰的Rsα蛋白具有较高的生物活性,为研究其作为布氏菌糖蛋白候选疫苗的可行性奠定了基础。 相似文献
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《化学世界》2017,(10)
壳寡糖(CSO)是自然界唯一带正电的功能性碱性多糖,具有抗氧化、抑菌、抗糖尿病和抗肿瘤等多种生物活性作用,并广泛用于药物和基因载体。壳寡糖的功能性与其聚合度密切相关,随着壳寡糖功能性研究的发展,对壳寡糖聚合度的分析测定提出了挑战。采用衍生化的方法检测壳寡糖样品的聚合度及分布,将壳寡糖与3-(2-吡啶二巯基)丙酸N-羟基琥珀酰亚胺酯(SPDP)反应,得到醇溶性CSO-SPDP衍生物,在此基础上,将该衍生物溶于甲醇,采用高分辨液相质谱法(ESIMS)测定其分子量,得到壳寡糖的聚合度及分布信息,结果表明测定的壳寡糖样品含壳三糖、四糖、六糖和九糖。并且采用红外光谱法(IR)和核磁共振氢谱法(1 H NMR)对其结构进行了表征。 相似文献
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透明质酸等化妆品用生物活性多糖吸湿保湿性能测定 总被引:2,自引:0,他引:2
目的:研究单一生物活性多糖及复配物的吸湿保湿性能。方法:通过干燥器控制湿度的方法对透明质酸、鲨鱼软骨素、海藻酸钠、水溶性壳聚糖、卡拉胶寡糖等天然保湿材料与常用保湿剂甘油进行吸湿和保瀑性能测试。结果:在RH81%条件下,各试样吸湿能力顺序为:卡拉胶寡糖,甘油,海藻酸钠,水溶性壳聚糖,透明质酸〉鲨鱼软骨素;在RH43%条件下,各试样吸湿能力顺序为:甘油,海藻酸钠,水溶性壳聚糖,透明质酸,卡拉胶寡糖,鲨鱼软骨素。硅胶环境下,各试样的保湿能力顺序为:透明质酸〉水溶性壳聚糖〉卡拉胶寡糖〉鲨鱼软骨素〉海藻酸钠〉甘油。遥过对5种聚糖的两两复配实验,筛选出卡拉胶寡糖、水溶性壳聚糖、透明质酸3种生物活性多糖与其它多糖复配效果较好。结论:本实验所采用的吸湿、保湿性能评价方法准确、简单、可靠,适用于各种类型的保湿剂,可作为一种化妆品用保瀑剂的性能评价方法。 相似文献
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Yuji Hotta Takahisa Tsugoshi Takaaki Nagaoka Masaki Yasuoka Kanzou Nakamura Koji Watari 《Journal of the American Ceramic Society》2003,86(5):755-760
A slurry used to produce dense green compacts by slip casting should exhibit low viscosity, high solids content, and good dispersion. Slurries with good characteristics were produced in the present study by adding oligosaccharide alcohol to an Al2 O3 slurry with an NH4 + salt of poly(methacrylic acid) (NH4 + -PMA). The role of NH4 + -PMA and oligosaccharide alcohol in the Al2 O3 slurry was examined by DTA, ζ-potential measurement, high-pressure liquid chromatography, and viscometry. The viscosity of the slurry with NH4 + -PMA and oligosaccharide alcohol was lower than that of the slurry with NH4 + -PMA at a high solids content. Oligosaccharide alcohol did not interact with the Al2 O3 surface. However, the Al2 O3 slurry with NH4 + -PMA was influenced by the addition of oligosaccharide alcohol. We found that the dispersibility of the slurry was greatly improved by adding oligosaccharide alcohol. The transmittance of the Al2 O3 ceramics produced by slip casting using the slurry with both NH4 + -PMA and oligosaccharide alcohol was higher than that of ceramics produced by slip casting using the slurry with NH4 + -PMA alone. The increased optical property resulted from low viscosity, which was attributed to the addition of oligosaccharide alcohol, at a high solids content. 相似文献
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在水-乙醇介质中,以寡聚酸钾与硝酸铈反应,合成寡聚酸合铈(Ⅲ)配合物,采用正交实验,考察了V水∶V乙醇、反应温度、反应时间对螯合反应的影响。结果表明,最优反应条件为:V水∶V乙醇=1∶3;温度50℃,时间6 h。通过红外光谱、紫外光谱和差热-热重分析测试手段对配合物进行了表征。红外光谱和紫外光谱均显示,Ce3+与寡聚酸配位,寡聚酸合铈(Ⅲ)配合物中金属配位方式为双齿配位。抗氧化作用研究表明,寡聚酸钾和寡聚酸合铈(Ⅲ)配合物均具有抗氧化活性,配合物与寡聚酸钾相比,对.OH有更高的清除活性。 相似文献
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Stewart R Thom G Levens M Güler-Gane G Holgate R Rudd PM Webster C Jermutus L Lund J 《Protein engineering, design & selection : PEDS》2011,24(9):671-678
Ribosome display was applied to the Fc region of human immunoglobulin G (IgG1) to select for improved binding to human FcγRIIIa, the receptor expressed on human natural killer cells that mediates antibody-dependent cellular cytotoxicity (ADCC). A library of human Fcγ1 variants was generated using error-prone polymerase chain reaction, and subjected to multiple rounds of ribosome display selection against progressively decreasing concentrations of soluble human FcγRIIIa, to enrich for improved binders. Radioimmunoassay and alphascreen analyses of the aglycosylated IgG-Fc output revealed variants with improved binding to FcγRIIIa relative to wild-type IgG-Fc. Subsequent expression in human (HEK-EBNA) cells generated glycosylated IgGs with modified activity in ADCC assays. One particular variant, 125_B01 triggered enhanced ADCC (EC(50) up to four-fold reduced with increased maximal lysis) relative to wild-type antibody, having more equal levels of ADCC for each allotype (V158/F158) of FcγRIIIa. Deconvolution of individual replacements within the variant showed that improved function arose from the Phe243Leu replacement within the CH2 domain, rather than the CH3 domain replacements Thr393Ala or His433Pro. Surprisingly, the oligosaccharide profiles of 125_B01 indicated more oligosaccharide chains lacking fucose, or with bisecting N-acetylglucosamine relative to wild-type IgG1, which correlates with improved function and the replacement Phe243Leu that is a carbohydrate contact residue within the C(H)2 domain. 相似文献
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In this article, we investigate the effects of oligosaccharide accumulated in the coagulation bath on the lyocell fiber process during industrial production. The research method consists of three parts. First, high‐performance liquid chromatography is used to analyze the monosaccharide composition of lyocell fibers and their pulp materials to determine whether the hemicelluloses in pulp material can be precipitated from the coagulation bath and then regenerated into lyocell fibers. Second, we establish a method for measuring the total sugar mixture content in the coagulation bath, which is a necessary technique during the industrial production of lyocell fibers. Third, we study the effect of oligosaccharide accumulated in the coagulation bath on the mechanical properties and supermolecular structure of lyocell fibers through a simulation experiment. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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寡聚酸合铜(Ⅱ)配合物的合成及表征 总被引:1,自引:0,他引:1
在水-乙醇体系中,以寡聚酸钾与Cu2+离子反应合成寡聚酸合铜(Ⅱ)配合物,采用正交实验,考察了V(水)∶V(乙醇)、反应温度、反应时间对螯合反应的影响,最优反应条件为:V(水)∶V(乙醇)=1∶4,40℃,6 h。采用红外光谱,紫外光谱和差热-热重分析对寡聚酸合铜(Ⅱ)配合物进行了表征。红外光谱和紫外光谱分析均表明,Cu2+与寡聚酸配位。寡聚酸合铜(Ⅱ)配合物中金属配位方式为单齿配位。热分析表明,配合物在190℃之前是稳定的,其分解过程是逐步进行的。初步应用实验表明,叶面喷施稀释100 000倍的寡聚酸合铜(Ⅱ)促进了花生的生长发育。 相似文献