Electrocatalytic Oxidation of H_2 O_ 2 at a Carbon Paste Electrode Modified with a Nickel (Ⅱ)-5,11,17,23-Tetra-Tert-Butyl-25,27-Bis(Diethylcarbamoylmethoxy)Calix[4] Arene Complex and Its Application

0　IntroductionThegreatimportanceofnickelelectrochemistryinalkalinemedium ,especiallyforpotentialapplication ,hasattractedmuchattetionofresearcherseithertostudythebehaviorofnickel basedelectrodeitselforitsactivitytowardsothermolecules.Manyreportsshowedthatthenickelbasedelectrodeshaveelectro catalyticactivityforreactionsofappliedinterest,suchaselectro chemicaldeterminationofantioxidantsinfood[1 ] ,detectionofni tricoxide (NO )insolution[2 ] ,electrocatalyticoxidationofmethanol[1 ] ,alcohol[3] ,…     

复合变性玉米淀粉印花糊料的性能研究

对复合变性玉米淀粉印花糊料的增稠性，稳定性，印花特性及流变性等方面作了系统研究，并认为此糊料可以全部或部分代替海藻酸钠。     

Cholecystokinin is not a major regulator in the digestive system in the chicken

To find out whether physiological concentrations of cholecystokinin (CCK), a gastrointestinal hormone in mammals, are also active in chickens, the pancreatic amylase secretory response to CCK-8 was investigated in vitro. Rat pancreatic acini responded to the physiological concentration of CCK-8, but in chickens amylase release was induced at a concentration of CCK-8 1000 times higher than that observed in rats. In another experiment, biliary flow was tested with several doses of CCK-8. The bile flow was stimulated in a dose-dependent fashion, but a significant enhancement was not obtained at a concentration of 0.5 g CCK-8/kg body weight, which was considerably higher than physiological ones. It is concluded that endogeneous CCK does not have an important role in the digestive system in the chicken.     

免疫鸡群新城疫病毒检测和分离的研究

以ＳＰＦ鸡抗新城疫病毒（ＮＤＶ）ＩｇＧ为包被抗体（５μｇ／ｍＬ）,兔抗ＮＤＶＶｅｒｏ细胞培养纯化毒ＩｇＧ为第二抗体（１∶２００～６００）,酶标记羊抗兔ＩｇＧ（１∶５０００）为指示抗体建立间接夹心ＥＬＩＳＡ,检测实验免疫鸡、攻毒鸡及现地免疫鸡口腔或泄殖腔外分泌物。结果表明：新城疫无毒力Ｖ４疫苗免疫后２ｄ,口腔内病毒抗原随机检出率为４／１０,第１０天为１０／１０;泄殖腔为０～１／１０,并持续１８ｄ以上。滴鼻攻毒后１ｄ,口腔和泄殖腔内病毒抗原检出率分别是８／１０和６／１０;第１３天,泄殖腔内病毒抗原检出阴性。ＮＤＶ灭活疫苗免疫６０ｄ后攻毒,第２天有７／２０口腔和８／２０泄殖腔检出阳性,并一直到攻毒后第１４天。非免疫对照鸡攻毒后第３天直到死亡时,口腔和泄殖腔均可检出病毒抗原。对各地临床上无任何症状的ＮＤＶ免疫鸡群检测发现,泄殖腔ＮＤＶ抗原阳性率０％～９．３％,分离到８株ＮＤＶ流行毒株,生物学试验证实这些毒株的毒力属中等毒力偏强或强毒。     

Ferrocene-Nafion修饰厚膜碳糊电极的葡萄糖传感器研究

以基于丝网印刷技术制作的厚膜碳糊电极为基底电机,用二茂铁为介体、Nafion修饰厚膜碳糊电极制备了葡萄糖传感器．Nafion涂于电极表面上形成的膜具有强的附着力,防止了二茂铁及酶的流失,电极稳定性提高．并且由于低的工作电位（＋025vsSCE）和Nafion膜的阳离子交换作用,基本上消除了电活性物质（抗坏血酸、尿酸）的干扰,具有防污能力．该酶传感器的检测上限可达18mmol／L,响应时间小于60s.     

铜纳米粒子修饰碳糊电极测定氨基酸

采用铜纳米粒子(平均粒径d≈50nm)修饰的碳糊电极,实现了电化学方法在近中性(pH=8磷酸缓冲溶液)条件下对甘氨酸等15种氨基酸的定量测定,测定的线性范围(甘氨酸)为2.5×1-05~7.4×1-04mol.L-1,最低检测下限(甘氨酸)为2.5×1-06mol.L-1(S/σ>3).     

Effect of Carboxymethyl Starch as Stabilizer for Increasing the Stability of Warp Sizing Pastes

The influences of carboxymethyl starch used as stabilizer upon the stability of native cornstarch-polyvinyl alcohol blend pastes for warp sizing have been investigated. The effect of the modified starch on the paste stability was evaluated in terms of the initial demixing time and the volume percentage of separated starch. The carboxymethyl starch with a series of different degrees of substitution was prepared in ethanol dispersion by varying the amount of monochloroacetic acid reacted with refined native cornstarch. The paste stability strongly depends on the modification extent and amount of carboxymethyl starch used, and on native starch content in the paste. Increase in the modification extent and/or the amount of the modified starch effectively retards the phase separation and reduces the separation extent of native cornstarch-polyvinyl alcohol blend pastes. Moreover, the mechanism and favorable modification extent of carboxymethyl starch for enhancing paste stability are also investigated and disc     

魔芋糊涂料印花应用研究

对魔芋的组成和葡甘露聚糖的分子物性进行了分析,测定了魔芋糊的成糊性、贮存稳定性和在涂料印花中的表面给色量,确定了魔芋粉的制糊条件和应用工艺,并在实际生产中探讨了魔芋糊应用于涂料印花的可能性.     

中草药保健剂“鸡食乐”对雏鸡红细胞免疫功能的影响研究

本研究将健康1日龄京白雏鸡100只随机均分为试验组和对照组.试验组饮水中添加“鸡食乐”煎汁,使饮水药液浓度为1%让鸡自由饮用;对照组饮水中不添加任何药物.饲养至7周龄,各组取15只采血测试红细胞免疫功能.结果,试验组、对照组红细胞C_(3b)受体花环形成率(E-C_(3b)R)分别为13.4±1.51%、10.6±1.25%,组间差异极显著(P<0.01),红细胞免疫复合物花环形成率(E—IC)分别为5.4±1.51%、4.7±1.34%,组间差异不显著(P>0.05),红细胞C_(3b)受体花环促进率(RFER)分别为55.5±10.8%、38.3±10.7%,组间差异极显著(P<0.01);红细胞C_(3b)受体花环抑制(RFIR)分别为17.4±3.4%、17.7±3.8%,组间差异不显著(P>0.05).     

聚乙烯醇纤维和维尼纶纤维增强水泥石的研究

以聚乙烯醇纤维和维尼纶纤维为增强纤维，研究了水化时间、养护方式和纤维对水泥石力学性能的影响。发现：随着水化时间的延长，水泥石力学性能提高；养护方式影响素水泥石的力学性能，但较小影响纤维增强水泥石的力学性能；少量纤维加入到水泥基体中，能有效提高水泥石的力学性能；较高强度模量的聚乙烯醇纤维的增强增韧效果优于较低强度模量的维尼纶纤维。