滴定度

A series of cholesterol-bearing O-carboxylmethyl chitosan conjugates with different degrees of substitution of the cholesterol moieties and cholesterol-bearing chitosan were synthesized by the succinyl linkages and characterized by Fourier transform infrared, Proton Nuclear Magnetic Resonance (~1H NMR) and elemental analysis. These hydrophobized chitosan derivatives were amphiphilic in nature and their self-aggregation behavior in aqueous media was evaluated by the fluorescence probe technique.

课题的主要研究内容如下：采用化学的方法合成了不同分子结构、不同取代度的系列胆甾醇基壳聚糖衍生物—胆甾醇基壳聚糖和胆甾醇基-羧甲基壳聚糖，并应用先进的分析手段电位滴定、红外光谱法(IR、核磁共振波谱法等对原料、中间产物以及产物进行了结构表征，衍生物分子中的胆甾醇基取代度(3.2％～12.5％)采用元素分析的方法进行检测。

Methods According to Evaluation and Expression of Uncertainty in Measurement (JJF1059-1999), analysis of measure uncertainty of the chemical oxygen demand determined by acidic potassium permanganate titrate prescribed in Sanitary Standards for Drinking Water (2001) was conducted.

根据JJF 1059-1999《测量不确定度评定与表示》对《生活饮用水卫生规范》(2001)中耗氧量的酸性高锰酸钾滴定法的测量不确定度进行分析评定。结果水中耗氧量测定的A类相对标准不确定度为0.584%，B类不确定度为0.781%。

The value of reference solution is measured by gravimetric titrimetry in this paper. The process of evaluating uncertainty is established according to JJF1059-1999 Evaluation and Expression of Uncertainty in Measurement.

本文应用质量滴定法为硝酸银标准溶液定值，按照国家颁布的国家计量技术规范《测量不确定度评定与表示》JJF1059——1999的规定建立了硝酸银标准溶液不确定度的评定步骤。

The uncertainty of Cr content that determined by ammonium persulfate oxidation titrimetry in stainless steel was studied by adopting the current international method.

采用国际通用的方法研究了过硫酸铵氧化滴定法测定不锈钢中铬量的不确定度，分析了不确定度的主要来源，评定了不确定度分量及总不确定度。

Accuracy of determination of deacetylation degree of chitosan by two abrupt change conductometric titration was studied, and effects of chitosan solution concentration, viscosity and deacetylation degree on the result of equivalence point were also investigated.

结果表明：壳聚糖样品质量浓度控制在2～6g/L，利用双突跃电位滴定法可以测定壳聚糖的脱乙酰度，不同样品脱乙酰度测定结果RSD小于0.61%(n=3)，该方法具有较高地准确性，可以用于壳聚糖生产和加工过程中的质量控制与检测

The factors affect on the degree of substitution of product, yield and apparent viscosity, such as the mol rates of EPTAC with -NH2, reaction temperature, reaction time and the content of water in system have been discussed in detail. FTIR spectrometer and UV spectrometer are used to characterize the structure of the derivative and it is proved that substitution reaction mainly occurs on the -N element .The particle size and morphology of chitosan and quantemary ammonium salt of chitosan are analysised by comparing photos of their scanning electron microscope. The degree of substitution of HACC is determined by acid -base conductometric titration. An error in current formula of DS has pointed out and a correct formula has presented.On the base of experience of above experiment, the reaction conditions of HACC were systematically investigated through orthogonal design, and then the best conditions are found. Water-solubility and dependence of pH are studied.

壳聚糖和环氧丙基三甲基氯化铵在异相条件下发生反应，通过单因素实验，制备了一系列不同性能的壳聚糖季铵盐，本文首次详细讨论了反应条件(反应摩尔比、反应时间、反应温度、水含量)对产率及产物性能的影响；用红外光谱和核磁共振对结构进行表征分析时，发现季铵盐阳离子基以N位上取代为主；通过电镜图片对壳聚糖和季铵盐衍生物外观形貌进行对比，采用酸碱电导滴定法测定产物的取代度，并对常用取代度公式做了修正。

Determine the virus titer by microtitration and plaque formation test and the virus proliferation by IFA, and perform genomic stability test.

用微量滴定法与蚀斑法平行检测病毒滴度，用免疫荧光法检测病毒的增殖情况，最后进行病毒基因组稳定性检测。

These Cox.B prototype viruses were titrated on both Hep-2 and L-hCAR cells and their titers were similar.

B 1～6型标准株进行滴定，两种细胞上的病毒滴度无显著性差异。

Results The new method is appropriate for the solution with lower concentration of Cl -, compared with the fluorescein and potassium chromate indicator method.

为此 ，我们进行了利用内置浊度传感器检测溶液的浑浊程度来判断滴定终点，测定 Cl-含量的方法研究(以下称散射光度滴定法)。

After three biopanning procedures , there was remarkable enrichment for the titer of bound phages in each biopanning procedure.

本研究共进行三轮生物淘洗，滴定每轮产出噬菌体的滴度，计算噬菌体的产率。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。