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1.
镉锌交互作用对玉米幼苗生理生化特性的影响 总被引：6，自引：0，他引：6
以不同浓度的镉(Cd2 )、锌(Zn2 )处理玉米，研究CA、Zn单一及复合污染对幼苗生长及生理生化特性的影响．结果表明，随着Cd2 、Zn2 浓度的增加，CA、Zn单一及复合处理的根长，株高、根和地上部干重减少；根内丙二醛(MDA)积累增加，根系活力和叶片硝酸还原酶活性下降，叶绿素含量降低，Cd、Zn交互作用显示出协同作用的趋势。 相似文献
2.
研究了Zn（Ⅱ）一SCN--RhB显色反应体系,建立了分光光度法测定药物中微量Zn（Ⅱ）的新方法．结果表明,在HAc—NaAc缓冲介质中,Zn（Ⅱ）一SCN--RhB离子缔合物在555nm处有一较强的吸收峰．在最佳实验条件下,Zn（1I）的质量浓度在0．080～0．80big·mL^1的范围内服从比尔定律,其表观摩尔吸收系数￡为5．5×10^4L·mol^-1·cm^-1．该方法直接用于测定药物制剂中痕量锌含量,结果较满意． 相似文献
3.
Wu CY Feng Y Shohag MJ Lu LL Wei YY Gao C Yang XE 《Journal of Zhejiang University. Science. B》2011,12(5):408-418
Zinc (Zn) is an essential micronutrient for humans, but Zn deficiency has become serious as equally as iron (Fe) and vitamin
A deficiencies nowadays. Selection and breeding of high Zn-density crops is a suitable, cost-effective, and sustainable way
to improve human health. However, the mechanism of high Zn density in rice grain is not fully understood, especially how Zn
transports from soil to grains. Hydroponics experiments were carried out to compare Zn uptake and distribution in two different
Zn-density rice genotypes using stable isotope technique. At seedling stage, IR68144 showed higher 68Zn uptake and transport rate to the shoot for the short-term, but no significant difference was observed in both genotypes
for the long-term. Zn in xylem sap of IR68144 was consistently higher, and IR68144 exhibited higher Zn absorption ratio than
IR64 at sufficient (2.0 μmol/L) or surplus (8.0 μmol/L) Zn supply level. IR64 and IR68144 showed similar patterns of 68Zn accumulation in new leaves at seedling stage and in developing grains at ripening stage, whereas 68Zn in new leaves and grains of IR68144 was consistently higher. These results suggested that a rapid root-to-shoot translocation
and enhanced xylem loading capacity may be the crucial processes for high Zn density in rice grains. 相似文献
4.
广西某低品位氧化锌矿成分复杂,风化、泥化严重,属于难分离难处理矿石,应用浸出-萃取-电积回收工艺进行试验,研究酸度和萃取剂处理等因素对浸出、萃取过程的影响。应用该工艺进行试验,获得锌浸出率96%,综合回收率为90%（从原矿到电解）,电解金属锌纯度99.95%的试验指标,为低品位氧化锌矿回收提供了新途径。 相似文献
5.
结合马钢第四钢轧总厂1#和2#镀锌线投产四年来的生产实践,对热浸镀锌的锌锭添加控制现状进行了分析,重点探讨了辟锅铝含量的消耗及其影响因素,分析了国内外的锌锭添加方法,提出在实际生产中从工艺和操作上采取措施进行控制,合理添加锌锭。减少了GI锌锅的成分波动。 相似文献
6.
Wei-dong Yang Yu-yan Wang Feng-liang Zhao Zhe-li Ding Xin-cheng Zhang Zhi-qiang Zhu Xiao-e Yang 《Journal of Zhejiang University. Science. B》2014,15(9):788-800
Willows (Salix spp.) have shown high potential for the phytoextraction of heavy metals. This study compares variations in copper (Cu) and zinc (Zn) tolerance and accumulation potential among 12 willow clones grown in a nutrient solution treated with 50 μmol/L of Cu or Zn, respectively. The results showed differences in the tolerance and accumulation of Cu and Zn with respect to different species/clones. The biomass variation among clones in response to Cu or Zn exposure ranged from the stimulation of growth to inhibition, and all of the clones tested showed higher tolerance to Cu than to Zn. The clones exhibited less variation in Cu accumulation but larger variation in Zn accumulation. Based on translocation factors, it was found that most of the Cu was retained in the roots and that Zn was more mobile than Cu for all clones. It is concluded that most willow clones are good accumulators of Zn and Cu. 相似文献
7.
土酸溶液中十六烷基三甲基溴化铵对锌的缓蚀作用及吸附热力学研究 总被引：1，自引：0，他引：1
用失重法研究了土酸溶液中十六烷基三甲基溴化铵对锌的缓蚀作用,发现十六烷基三甲基溴化铵在锌表面上的吸附是产生缓蚀作用的重要原因,且吸附规律服从Langmuir吸附等温式.用Sekine方法处理实验数据,从而获得了吸附过程△H0、△S0和△G0等一系列重要热力学参数. 相似文献
8.
珊瑚矿枱浮硫化矿分离选矿试验研究 总被引：2，自引：0，他引：2
珊瑚矿精选枱浮脱硫产出的硫化矿,含有铜、锌、硫、砷、钨、锡等有用矿物。经选矿分离试验,磨矿细度-0.074mm占83%的条件下,采用先铜后锌的优先浮选流程,可获得含铜23.85%、铜回收率90.02%的铜精矿和含锌45.02%,锌回收率85.18%的锌精矿。 相似文献
9.
氧化锌晶须是一种具有规整三维结构立体四针状单晶体微纤维,其原料来源广泛,成本低廉。四角状氧化锌晶须具有多功能特性,在耐磨、防滑材料,抗静电及导电复合材料,电波吸收材料,减振抗冲及隔音材料等方面均有广泛的应用。本文简述了T-ZnO晶须的发展、结构和特性、制备方法和生长.以及作为材料的应用。 相似文献
10.
In previous studies, we have reported first in vivo evidence of copper deposition in the choroid plexus, cognitive impairments, astrocytes swelling (Alzheimer type II cells) and astrogliosis (increase in number of astrocytes), and degenerated neurons coupled with significant increase in the hippocampus copper and zinc content in copper-intoxicated Wistar rats. Nonetheless, hippocampus iron levels were not affected by chronic copper-intoxication. Notwithstanding information on distribution of copper, zinc and iron status in different regions of brain due to chronic copper exposure remains fragmentary. In continuation with our previous study, the aim of this study was to investigate the effects of intraperitoneally injected copper lactate (0.15 mg Cu/100 g body weight) daily for 90 days on copper, zinc and iron levels in different regions of the brain using atomic absorption spectrophotometry. Copper-intoxicated group showed significantly increased cortex, cerebellum and striatum copper content (76, 46.8 and 80.7 % increase, respectively) compared to control group. However, non-significant changes were observed for the zinc and iron content in cortex, cerebellum and striatum due to chronic copper exposure. In conclusion, the current study demonstrates that chronic copper toxicity causes differential copper buildup in cortex, cerebellum and striatum region of central nervous system of male Wistar rats; signifying the critical requirement to discretely evaluate the effect of copper neurotoxicity in different brain regions, and ensuing neuropathological and cognitive dysfunctions. 相似文献