Treatment of zinc deficiency without zinc fortification     

Oberleas D  Harland BF 《Journal of Zhejiang University. Science. B》2008,9(3):192-196

Zinc (Zn) deficiency in animals became of interest until the 1950s. In this paper, progresses in researches on physi-ology of Zn deficiency in animals, phytate effect on bioavailability of Zn, and role of phytase in healing Zn deficiency of animals were reviewed. Several studies demonstrated that Zn is recycled via the pancreas; the problem of Zn deficiency was controlled by Zn homeostasis. The endogenous secretion of Zn is considered as an important factor influencing Zn deficiency, and the critical molar ratio is 10. Phytate (inositol hexaphosphate) constituted up to 90% of the organically bound phosphorus in seeds. Great improvement has been made in recent years on isolating and measuring phytate, and its structure is clear. Phytate is considered to reduce Zn bioavailability in animal. Phytase is the enzyme that hydrolyzes phytate and is present in yeast, rye bran, wheat bran, barley, triticale, and many bacteria and fungi. Zinc nutrition and bioavailability can be enhanced by addition of phytase to animal feeds. Therefore, using phytase as supplements, the most prevalent Zn deficiency in animals may be effectively corrected without the mining and smelting of several tons of zinc daily needed to correct this deficiency by fortification worldwide.  相似文献   

复方炉甘石洗剂中氧化锌含量测定方法探索     

杨慧  邵阳  陈昌云 《南京晓庄学院学报》2012,(3):59-62

制定以二甲酚橙（XO）为指示剂的测定复方炉甘石洗剂中ZnO含量的实验室方法,并与以铬黑T为指示剂的药典方法进行比较.其结果显示以XO为指示剂的实验方法与以铬黑T为指示剂的两种方法测定结果相比相差不大,且以XO为指示剂的实验方法具有简单,快捷,准确,滴定终点变色明显,易于观察等优点,更适合于滴定分析实验教学中复方炉甘石洗剂中ZnO含量的测定.  相似文献   

Zn^2＋对福寿螺肝脏抗氧化酶活性和脂质过氧化的影响     

柯佳颖  王泽贤  陈细香  陈朝阳 《泉州师范学院学报》2013,(6):19-23

以福寿螺为研究对象,测定其在Zn^2＋浓度分别为0、1、2、5、10mg／L时,于不同暴露时间（12、24、48、96h）内,肝脏超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和丙二醛（MDA）活性的变化．结果表明：低浓度（1、2mg／L）的Zn^2＋处理组在24h内对福寿螺肝脏SOD活性起到诱导作用;随着时间的延长活性逐渐减弱,在96h时下降至最低值,极显著低于对照组水平;而中、高浓度（5、10mg／L）处理组酶活性均低于对照组．在各浓度组的胁迫下,CAT活性在12h时升高到最大值,之后随着时间的延长均表现为下降趋势．MDA含量在整个试验期间均处于诱导状态,并且与重金属浓度成正比,在10mg／L96h时达到最大值．Zn^2＋会对福寿螺产生明显的氧化胁迫,SOD、CAT和MDA指标能有效评价Zn^2＋对福寿螺的氧化损伤．  相似文献   

“重铬酸钾法测定铁矿石中铁的含量”实验的改进     

杜超  申德君  龙星宇  陆安会 《贵阳金筑大学学报》2006,(1)

经典的重铬酸钾法(SnCl2—HgCl2法)测定铁矿石中铁的含量[1],方法准确、简便,但所用氯化汞是剧毒物质,会严重污染环境,从而对(SnCl2—HgCl2)测铁法进行了一定的改进,将该实验中采用的还原剂SnCl2换成了廉价、易操作、易处理、无污染的锌片或锌粉。  相似文献   

红外光谱的固体样品制备及应用（Ⅱ）—粉末样品的制备及应用     

侯冬岩  回瑞华 《鞍山师范学院学报》2000,2(3):64-67

阐述了红外光谱的固体粉末样品制备技术，并用实例介绍了其在研究工作中的应用。  相似文献   

锌与运动能力关系研究之进展     

段宝林 《山西师大体育学院学报》2001,16(3):75-77

长时间剧烈运动后,人体内会产生大量自由基,从而对生物膜结构的完整性产生伤害,微量元素锌是人体内重要的抗氧化剂,对生物膜有保护作用,保持酶的正常活性,以维持人体正常的运动能力.文章论述了微量元素锌的抗氧化消除自由基以维持细胞结构完整性的作用机制,分析了微量元素锌与运动能力的关系,以及补锌对运动能力的重要性.  相似文献   

Diversity change of microbial communities responding to zinc and arsenic pollution in a river of northeastern China     

Jun Zhao  Xin Zhao  Lei Chao  Wei Zhang  Tao You  Jie Zhang 《Journal of Zhejiang University. Science. B》2014,15(7):670-680

Pollution discharge disturbs the natural functions of water systems. The environmental microbial community composition and diversity are sensitive key indicators to the impact of water pollutant on the microbial ecology system over time. It is meaningful to develop a way to identify the microbial diversity related to heavy metal effects in evaluating river pollution. Water and sediment samples were collected from eight sections along the Tiaozi River where wastewater and sewage were discharged from Siping City in northeastern China. The main pollutants contents and microbial communities were analyzed. As the primary metal pollutants, zinc (Zn) and arsenic (As) were recorded at the maximum concentrations of 420 and 5.72 μg/L in the water, and 1704 and 1.92 mg/kg in the sediment, respectively. These pollutants posed a threat to the microbial community diversity as only a few species of bacteria and eukaryotes with strong resistance were detected through denaturing gradient gel electrophoresis (DGGE). Acinetobacter johnsonii, Clostridium cellulovorans, and Trichococcus pasteurii were the dominant bacteria in the severely polluted areas. The massive reproduction of Limnodrilus hoffmeisteri almost depleted the dissolved oxygen (DO) and resulted in the decline of the aerobic bacteria. It was noted that the pollution reduced the microbial diversity but the L. hoffmeisteri mass increased as the dominant community, which led to the overconsuming of DO and anaerobic stinking water bodies. Water quality, concentrations of heavy metals, and the spatial distribution of microbial populations have obvious consistencies, which mean that the heavy metals in the river pose a serious stress on the microorganisms.  相似文献   

Improved yield and Zn accumulation for rice grain by Zn fertilization and optimized water management   总被引：1，自引：0，他引：1  

Yu-yan WANG  Yan-yan WEI  Lan-xue DONG  Ling-li LU  Ying FENG  Jie ZHANG  Feng-shan PAN  Xiao-e YANG 《Journal of Zhejiang University. Science. B》2014,15(4):365-374

研究目的：在生产高度集约化体系下,研究节水灌溉措施及锌肥对水稻产量及锌积累量的影响。创新要点：目前关于干湿交替能否对水稻增产仍存在争议,对锌含量及生物有效性也鲜有报道。因此,针对这些问题,本文系统地研究影响水稻产量及品质的两大限制性因素,即锌肥和灌溉方式对稻米锌生物有效性的影响。研究方法：采用盆钵试验模拟大田锌肥及水分管理方式,两种基因型、两种锌肥种类、两种水分管理,三个重复控制误差。利用电感耦合等离子体质谱（ICP-MS）测定微量元素锌含量,以精米中植酸含量表征锌生物有效性。重要结论：干湿交替在增加了稻米产量、锌含量及积累量方面效果显著。干湿交替结合土施硫酸锌肥可以作为水稻生产体系中获得高产、高锌、高生物有效性的农艺措施。  相似文献   

基质调控合成枝状碳酸钙及羟基锡酸锌包覆碳酸钙     

彭飞  ;焦运红  ;徐建中 《河北职业技术师范学院学报》2014,(1):15-20

以十六烷基三甲基溴化铵（CTAB）为有机模板,加入到丙三醇和水的混合溶液中制备碳酸钙并在其母液中进一步合成羟基锡酸锌包覆碳酸钙.通过XRD,SEM,TG-DSC分别对产物的晶型、形貌、热解行为进行了分析,并研究了CTAB浓度对碳酸钙的形貌和晶体结构的影响.结果表明：碳酸钙为枝状文石型碳酸钙,羟基锡酸锌较好的包覆在枝状碳酸钙表面,当CTAB质量浓度为2.2 g/L时,枝状晶体形态最好.  相似文献   

亚硫酸氢钠-锌粉漂白高岭土工艺研究   总被引：1，自引：0，他引：1  

林培喜  揭永文  邱宝渭 《茂名学院学报》2009,19(1):1-3

采用亚硫酸氢钠-锌粉漂白茂名地区的高岭土,研究了高岭土漂白的工艺条件。实验结果表明,亚硫酸氢钠和锌粉的加入量分别为高岭土质量的1．0％和0．25％、矿浆的pH值为1．5—2．0、矿浆质量分数为27％、漂白时间为20min时,高岭土白度由原矿的72％提高到84％。与保险粉漂白工艺相比,在漂白效果相同的情况下,可节约药剂成本25％以上。  相似文献