吸光度

To determine the condition of chromogenic reaction between iodine and amylum quantitatively, the author studied the law in the course of chromogenic reaction between iodine and amylum with the aid of spectrophotometer quantitatively, and found that maximum absorption wavelength is 610 nm, and the absorbance in the course of chromogenic reaction between iodine and amylum has not changed within 7 hours.

为了确定碘和淀粉反应的定量关系，本文利用分光光度计定量地研究了碘和淀粉显色反应过程中吸光度的变化规律，发现碘和淀粉显色反应的最大吸收波长为610 nm，碘和淀粉显色反应的吸光度在七小时内基本不变，可以进行比色分析。

A sensitive spectrophotometric method for the determination of trace amounts of chlorine dioxide based on the fading reaction of chlorophenol red by chlorine dioxide has been developed in the alkaline solution.

在弱碱性条件下，二氧化氯(ClO2 )氧化氯酚红使其褪色，于 5 75nm波长处测定剩余氯酚红的吸光度，当用试剂空白参比时，吸光度的降低值与ClO2 的浓度呈直线关系，其它氧化剂在测定条件下无干扰，方法有较高的灵敏度和很好的选择性。

After washed, the chromogen substrate was added and incubated for 30 minutes in the dark. Rinsed with distilled water, purple spots were observed and counted using a dissection microscope. The number of spots means the level of cytokine producted by sCTL. Analysis of ability of specific cytotoxic lymphocytes to lyse target cells: CytoTox96 Non-Radioactive Cytotoxicity Assay kit was used.

5特异性CTL裂解靶细胞能力测定：采用CytoTox96 Non-RadioactiveCytotoxicity Assay试剂盒，将经HBV core18-27短肽、重组乙肝病毒核心抗原共刺激培养13日的PBMC与HLA-A2〓的靶细胞按一定比例混合，靶细胞被裂解后，释放的乳酸脱氢酶与底物反应显色，酶标仪测定吸光度，吸光度与裂解程度成正比，按照公式计算百分裂解率。

Take a sulfosalicylic acid mole fraction as the abscissa, the extinction is the y-coordinate, makes the extinction constitutional diagram.

以磺基水杨酸摩尔分数为横坐标，吸光度为纵坐标，作出吸光度组成图。

And in the present of denaturant, the absorption increased significantly.

酶溶液在280 nm处只有微弱的吸光度，而在210 nm附近有很高的吸光度。

Among the four paper formation assessment methods, i.e., coefficient of variation, varience (S^2), M/K formation index, and modified all-pairs score, the COV and look-through judgements are most affected by mean light absorbance. Under similar mean light absorbance renditions, all four methods gave similar results.

吸光度变异系数、影像灰阶变异数(S^2)、M/K交织指数及目测修正成对评分法四种纸张交织评估法中，变异系数及目测法受纸样平均吸光度之影响较大，而平均吸光度相当时，四种评估法所得之结果相近。

The invention discloses a method for measuring seawater chemical oxygen demand by photometry, wherein the seawater exemplar is first pre-processed, then using the basic potassium hypermanganate as reaction system, the potassium permanganate is deacidized quantitatively by organics to produce manganate, using pure water or margin solution as reference ratio, measuring the absorbance an of the manganate at its maximum absorbing wave length 430 nm, drafting the A-COD value operating curve, obtaining the concentration of the organics in the water, i.e.

本发明公开了一种对海水化学需氧量进行测定的光度测定法，该方法首先将海水样品进行预处理，再以碱性高锰酸钾为反应体系，这样海水中的有机物在强碱性介质中与过量的高锰酸钾迅速反应，高锰酸钾被有机物定量还原后生成锰酸盐，以纯水或空白溶液作参比，在锰酸盐的最大吸收波长430nm处测其吸光度A，该吸光度A与海水样品中的有机物的含量具有正相关关系。

By synthetically analysizing the physical and chemical properties of all components and particle size, the content of F2641 in the JOB-iC is determined by gravimetric analysis after F2641 is seperated from HMX,TATB and PNP through ? alkali reflux. Determination conditions is set as follows the sample is boilingly refluxed for six hour in a constant temperature bath after adding lOOm! 8.0 ?? 0.1% NaOH. The solvent DMF saturated by TATB is used for extracting HMX,F21 and PNP from the sample and TATB is seperated by crucible filter G4. The mass precent of TATB is determined by extraction fractionation. The mass percent of PNP is measured by multiwavlength linear regression ultraviolet spectrophotometry. The testing conditions are set as follows:multiwavlength constitution: X=267nxn, 275nm, 283nm, 29mm, 299nm,the application scope of the Lambert-Beer law: the concentration of PNP is O.005?0.O25mgIml, the concentration of HMX is 0.060.3Omg/ml,absorption coefficents of PNP and HMX are solved by the slope of linear regression curve of absorbency- concentration of standard solution of PNP and HMIX for measuring wavelengthes,on the basis of the Lanibert-Beer law and absorbancy additivity principle, the slope of linear regression curve of A/E(1) and E1 of PNP and HMX solution is regarded as the concentration of PNP in the solution.

根据传爆药中各组分的物理、化学性质及主体炸药的粒度大小，进行综合分析，确定了采用碱回流重量法测定JOB-1C 中F_(2641)的含量，测定条件：加入100ml浓度为8.0±0.1％的氢氧化钠，在恒温水浴中煮沸回流6h；采用溶剂萃取法测定JOB-1C中TATB的含量，选择TATB饱和的二甲基甲酰胺为萃取溶剂，用G4坩埚式过虑器进行萃取分离；采用多波长线性回归紫外分光光度法测定JOB-1C中PNP的含量，通过实验确定了多波长组合：λ=267nm，275nm，283nm，291nm，299nm；朗波—比耳定律的适用范围为PNP浓度：0.005～0.025mg/ml，HMX浓度：0.06～0.30mg/ml；在测定波长下，对PNP、HMX标准溶液的吸光度—浓度进行线性回归，由回归曲线的斜率得出PNP、HMX的吸收系数；根据朗波—比耳定律和吸光度加和性原理，在测定波长下，对PNP、HMX 两组分混合溶液A_i/E_HMX(i与E_PNP(i/E_HMX(i进行线性回归，回归曲线的斜率即为混合溶液中PNP的浓度。

A novel method for determination of benzoyl peroxide with spectrophotometry was developed. Inclusion ratio of β cyclodextrin to dibenzoy peroxide and benzoic acid is obtained with spectrophotometry.The mechanism of the inclusion was studied,too. The results showed that β-CD react with dibenzoyl peroxide to form a 1:1 or 2:1 host-guest complex, with the apparent formation constants of 5.0× 10~2and 2.5× 10~4 , respectively.β-CD reacts with benzoic acid to form a 1:1 host-guest complex with the apparent formation constant of 6.9 × 10~2 after the dibenzoyl peroxide was reduced by hydroxyl ammonium chloride.

建立了用β环糊精测定过氧化苯甲酰的分光光度法，并测定了β环糊精与过氧化苯甲酰和苯甲酸的包结比，随着β-CD浓度的增大，可与BPO分别形成1：1或2：1的包容络合物，包结常数分别为5.0×10~2和2.5×10~4，与苯甲酸形成1：1的包容络合物，包结常数为6.9×10~2；由于包结物的吸光度值比过氧化苯甲酰的吸光度值大大增加，建立了一种当β-CD存在下，在水溶液中测定过氧化苯甲酰的方法。

On the bases of heating up amethyst, smoky quartz and yellow quartz; observing the change of their color; determining their absorbency and drawing the absorbency curve in different temperature and on the bases of the results of atomic absorption spectrometry, we discussed the stability of the color centers in quartz crystal.

通过在不同的温度下加热水晶，观察加热后的颜色变化，测定不同温度下的吸光度。根据各色水晶吸光度曲线特征及其在不同温度下的吸光度变化，结合原子吸收光谱分析，探讨有色水晶中空穴心的类型和稳定性。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。