Cr3+、Zn2+、Pb2+对小麦种子萌发及幼苗生长影响的研究

用不同浓度的Cr3 、Zn2 、Pb2 溶液处理小麦,研究Cr3 、Zn2 、Pb2 对小麦种子萌发及幼苗生长的影响.结果表明:大于0.10%时,Cr3 对小麦的萌发及生长发育有明显的抑制作用;低于0.05%时,Zn2 对小麦的萌发有一定的促进作用,而浓度加大后,对小麦的生长有轻微的抑制作用;小于0.10%时,Pb2 对小麦的生长有一定的促进作用,但随浓度的加大,促进作用转变为抑制作用;幼苗的生长比种子的萌发更能体现Pb2 的影响作用.     

Zn(OH)4-6和Zn(H2O)2+6系列配合物的电子结构

采用密度泛函理论(DFT)的B3PW91方法，在Lanl2dz、6-31G(d,p)、6-311++G(d,p)基组水平上对具有不同点群对称性的Zn(OH)^4-₆及Zn(H₂O)²⁺₆系列配合物的几何构型进行了全优化并在B3PW91/6/311++G(d,p)水平上对前线轨道、振动频率等性质进行了分析。Zn(OH)^4-₆系列配合物中具有D_3d点群对称性的构型最稳定，Zn(H₂O)²⁺₆系列配合物中具有T_h点群对称性的构型最稳定。从体系能量角度考虑，Zn(OH)^4-₆·6H₂O体系比Zn(H₂O)²⁺₆·6OH^-体系稳定。通过振动分析得到的O—H键吸收峰在3816和1638cm^-1位置处，Zn—O键的吸收峰在541和391cm^-1位置处，与文献报道的实验数值相符，证明所采用的理论方法及基组适用于研究Zn(OH)₆^4-和Zn(H₂O)²⁺₆系列配合物的电子结构。     

Zn~(2 )浓度与平菇菌丝体的生长

本实验研究了利用深层培养的平菇菌丝体进行富集、转化微量元素锌的过程中,不同浓度的锌离子对菌丝体生长的影响;并对各处理组的过氧化物酶的活性进行了分析。结果表明,10-50ppm的Zn2 件浓度对菌丝体生长有促进作用,其中20ppm的Zn2 浓度促进作用最为明显;100 ppm以上的Zn2 浓度对菌丝体的生长有抑制作用,过氧化物酶活性均低于对照组。     

Structural and optical properties of Zn1−xNixTe thin films prepared by electron beam evaporation technique

Zn1-xNixTe thin films with different composition(x=0.0, 0.05, 0.10, 0.15 and 0.20) were deposited on glass substrate by electron beam evaporation technique followed by its characterization using advanced structural and optical analysis techniques. Structural properties of the prepared thin films were studied by X-ray diffraction(XRD). The XRD patterns revealed that the binary compounds transformed into a ternary compound with cubic structure having preferred orientation along the c-direction with(111) planes. Composition analysis of the films was determined by energy dispersive analysis of X-rays(EDAX) and found to be in agreement with the precursor composition. Optical properties such as extinction coefficient(k) and band gap energy of these films were examined by using a spectroscopic ellipsometer. It was found that the extinction coefficient(k) increased with the addition of Ni content in the alloy. In comparison, the band gap energy was also determined by using transmission spectra and found to be agreed with that of the ellipsometric results. These analyses confirm that the band gap energy decreases with the increase of Ni content in the alloy.     

分光光度法测定黄芪药材中铜、铁、锌的含量

为了探讨分光光度法测定黄芪药材中Cu,Fe,Zn质量含量的可行性,笔者根据不同的金属离子与特定显色剂显色,可产生可见光吸收的现象,采用分光光度法平行测定人发标准品及黄芪中微量元素的质量含量.结果表明,黄芪中含丰富的微量元素,其中Fe质量含量最高(为173.08 mg.kg-1),Zn为75.87 mg.kg-1,Cu为17.05 mg.kg-1.分光光度法操作简便、测量快速、结果准确,易推广使用.     

CaCO3共沉淀富集法测生活饮用水中的Zn

建立了CaCO3共沉淀富集原子吸收光谱法测定水中Zn的方法.该法消除了磷酸盐、硅酸盐、铝盐等含氧阴离子的影响,提高了测定的灵敏度,其回归方程为A=0.3527c+0.0233,相关系数r=0.9996,方法检出限为0.06μg·mL-1,精密度为0.22%～0.64%,回收率为93.4%～96.9%,结果令人满意.     

富锌酸奶的研制

利用生物转化原理、将无机锌转化为酵母锌、制成富锌粉、添加到鲜奶中、利用乳酸菌制成强化锌酸奶.     

改性桂圆壳吸附废水中的Zn2+

以桂圆壳作为吸附剂吸附废水中Zn2,探讨了吸附时间、吸附剂用量、pH值以及吸附剂改性后对吸附率的影响.结果表明,桂圆壳生物吸附剂在吸附锌的初始阶段(0 ～1.5 h)开始是一个启动吸附的过程,2.5h时达到最佳吸附;最佳固液比为0.05 g/25 ml(100 μg/ml);在pH =2时,由氢氧化钠,丙酮处理过的桂圆...     

Effect of trace Zn, P and Mg additions on microstructure and mechanical properties of Nb-Si-Ti alloys

The effects of Zn,P and Mg additions on the microstructure and mechanical properties of Nb-22Ti-3Si alloys were studied. The phases of Nbss and Nb_3Si presented in Nb-22Ti-3Si(AC1),Nb-22Ti-3Si-0.2Zn(AC2) and Nb-22Ti-3Si-0.2Mg alloys(AC3). The Nb-22Ti-3Si-0.2P(AC4) alloy consisted of Nbss,Nb_3Si network and eutectic cell of Nbss/α-Nb_5Si_3.By the addition of Zn,the Nb_3Si network was broken and the volume fraction of Nbss increased from 92%to 96%.The values of fracture toughness of the alloy AC2 at ambien...     

Zn2+和复方新诺明(SMZ-TMP)对小麦种子发芽及幼苗生长的影响

Ｚｎ２＋ 和 Ｓ Ｍ Ｚ Ｔ Ｍ Ｐ 对小麦种子的发芽率没有显著影响,但 ０．０９％ Ｚｎ２＋ ＋ ０．５ｍ ｇ／ Ｌ Ｓ Ｍ Ｚ Ｔ Ｍ Ｐ 的处理液可提高其发芽指数、活力指数、幼苗长度、幼苗叶片叶绿素含量和幼苗根系活力,且０．１２％ Ｚｎ２＋ ＋ ０．５ｍ ｇ／ Ｌ Ｓ Ｍ Ｚ Ｔ Ｍ Ｐ 处理液能提高小麦幼苗中α—淀粉酶活性