浓度测定

The changes of the conductivity, molar conductivity, activity coefficient and relative partial molar free energy of LiCl with concentration and temperature of the solution were discussed.

应用电导率仪在288~308K温度范围内测定了LiCl在纯有机溶剂中的电导率；利用公式计算了LiCl的摩尔电导率；按Kohlrausch经验公式，使用Origin软件进行线性拟合，作图外推求得LiCl在异丙醇中的无限稀释摩尔电导率λ0值；并讨论了LiCl在异丙醉中的电导率、摩尔电导率、活度系数和相对偏摩尔自由能随溶液浓度和温度的变化关系及其温度对LiCl溶液无限稀释摩尔电导率的影响。

Nucleic acids were determined at nanogram levels based on their enhancement effects on the fluorescence reaction system between H 2O 2 and p hydroxyphenylacetic acid catalyzed by Mn [tetrakis(3 N methylpyridiniumy)porphyrin],a mimetic peroxidase.

痕量核酸对meso 四(3 N 甲基吡啶基)卟啉合锰催化H2 O2 氧化对羟基苯乙酸的荧光反应产生增强作用，且增强程度与核酸浓度之间有良好的线性关系，据此建立了测定核酸的高灵敏的荧光分析方法。

Under the excitation of 488 nm light beam of argon ion laser source, single suprahelical species could be observed with the aid of a common microscope due to the strong scattered light emitted by the suprahelical species. By capturing the RLS images of the single suprahelical species with a cooled charge coupled device camera, and analyzing the RLS data, herein an RLS imaging method of DNA was proposed based on the linear relationship between the counts of suprahelical species in the detection focus plane and the concentration of DNA in nanograms.

在488nm 氩离子激光光源的激发下，单个超螺旋聚集体的散射光可以通过普通显微镜观察到，用冷却型电荷耦合器对此单个粒子的RLS信号进行成像和分析，发现在聚焦平面上检测到的超螺旋粒子的个数与溶液中纳克级的DNA浓度成正比，基于此建立了一种测定DNA的方法。

Objective To establish a gas chromatographic method with carbon disulfide desorption for benzene ,toluene and xylenes in time-weighted averageconcentration in the workplace air.

目的 建立工作场所空气中苯系物的时间加权平均浓度气相色谱测定方法。

Wethers with permanent rumen fistula were used to determine concentration of plasma copper, activity of cuproenzyme, apparent digestibility of copper, and disappearance rates of DM and NDF of Chinese wildrye in sheep given different copper supplements to diets with low or high molybdenum. All sources provided 16 mg of added Cu/kg of DM. Molybdenum was added as sodium molybdate.

2利用安装有永久性瘤胃瘘管的杂交一代羯羊作为试验动物，采用单向分类设计，在不同钼水平下通过测定血浆铜浓度、含铜酶活性、铜表观消化率、羊草干物质及NDF消失率，比较不同饲料铜源对绵羊铜代谢和粗料消化能力的影响，铜的添加水平均为16mg·kg~(-1)，钼的添加形式为钼酸钠。

It was found that different substances and concentrations of volatiles influenced behavior reaction to A. glabripennis.

四臂嗅觉仪测定中，发现挥发性物质及浓度的不同，对光肩星天牛具有不同的行为反应。

In this experiment, BSA and chitosan are taken as cross-linking reagents, and nanoparticles gel and uricase are cross-linked on egg membrane.

本研究将改性纳米SiO_2凝胶和尿酸酶通过交联剂固定于蛋膜上，将酶膜紧贴于铂盘电极表面，然后以自制铂片电极为对电极、甘汞电极为参比电极，组成三电极体系，测定体液中尿酸的浓度。

It is prepared by utilizing glutaraldehyde cross-linked β-cyclodextrin to immobilize the uricase on the surface of screen-printed carbon paste electrodes which was modified by MnO2 nano-particles, and ferrocene is employed as an electron transfer mediator.

在丝网印刷碳电极上修饰纳米MnO2，并利用戊二醛和β-环糊精交联固定尿酸酶，以二茂铁作为电子媒介体，研制用于测定尿酸浓度的生物传感器。

Objective: To study the levels of nitric oxide in serum of 50 patients with head and neck squamous cell carcinoma and its clinical value.

目的：通过50例头颈部鳞癌患者血清一氧化氮浓度的测定，研究一氧化氮在头颈部鳞癌患者血清中的表达及其临床意义，探讨一氧化氮在头颈部鳞癌肿瘤免疫方面的作用。

Micronucleus of lymphocyte in peripheral blood from 92 stokers exposed to gas under low concentration for long time ane 74 healthy people unexposed to gas were examined.

本文对92例长期在低浓度煤气环境下工作的司炉工人与74例无毒物接触的健康人外周血淋巴细胞微核进行了测定。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。