吸光度

In the selected experiment conditions,potassium oxide and sodium oxide concentrations over the range of 420 μg/mL and ≤ 10 μg/mL, respectively are linear with the absorbance.

在仪器的最佳条件下，氧化钾和氧化钠在一定浓度范围与吸光度呈线性关系。

Using the iron standard solution makes standard curve, and then through the standard addition method measures the absorbance of water samples, and finally through the calculation knows content of iron of water sample.

通过铁标准溶液作出标准曲线，再通过标准加入法来测出水样的吸光度，最后通过计算得出水样中铁的含量。

The suitable detection wavelength was selected through qualitative determination of wave spectrum. With 95% ethanol as the reference solution, the standard curve was drawed with a series of different concn. of standard solution of chlorogenic acid, and the Absorbance of extracting solution was determined and the chlorogenic acid content in filtrate was calculated.

波谱定性检验选择适宜的测定波长，以95%乙醇为参比溶液，用配制好的一系列不同浓度的绿原酸标准溶液绘制标准曲线，测定提取液的吸光度，计算滤液中绿原酸的含量。

Absorbance was measured at 442 nM on a spectrophotometer.

用分光光度计测定其在442 nM处的吸光度。

In the solution of subacidity, FETs reacts with AlCl3 to form a stable and sensitive yellow complex, its maximum absorption wavelength is 415 nm.

研究表明：在弱酸性条件下，香椿叶提取液中总黄酮与AlCl3形成稳定的黄色配合物，在415nm处测定显色液的吸光度确定总黄酮的量。

The absorption of NH + 4 was lowered by t he i ndophenol method because of the similar structure of thymol and phenol.

由于百里酚与苯酚结构相似，造成靛酚法的铵离子分析中吸光度有所降低。

Using thymol -sodium hypobromite as chromogenic reagent,and extracting the colour formed with butanol,a spectrophotometric method for the determination of arginine in fermentation broth was studied.

以百里酚的次溴酸钠溶液为显色剂，用正丁醇萃取显色产物，以分光光度计比色测定有机相的吸光度值。

The results indicate seawater concentration has no effect on absorbency, pH, relative density, dry matter and water contents in Aloe vera leaves. While, seawater stress causes increased MDA and membrane penetration, decreased phytochroms, prolines and NO_3~--N. It is beneficial to plant growth when irrigation was done with 10% seawater, because of higher ratio of K~+/Na~+ and lower ratio of Na~+/Ca~(2+). In addition, the polysaccharide contents in Aloe vera leaves increase twice and triplication under 25% and 50% seawater irrigation respectively, the barbaloin contents increase over triplication in var. 75% seawater and over twice in var. 50% seawater and var. 100% seawater. However, when seawater concentration exceeds 25% the growth of plant was inhibited, biomass decreased, flowering time was deferred, Ca~(2+) content decreased caused by Na~+ accumulation in leaves.

结果表明：在海水胁迫下，库拉索芦荟全叶汁的吸光度、酸度、相对密度、总固形物和水分含量总体上受海水浓度的影响不大；但芦荟叶的丙二醛含量和质膜透性增加，叶绿体色素、脯氨酸和硝态氮含量减少；在10％海水浇灌下，芦荟叶细胞具有较高的K~+／Na~+比和较低的Na~+／Ca~(2+)比，对库拉索芦荟的生长有一定的促进作用；在25％海水和50％海水浇灌下，芦荟多糖含量提高了2-3倍；在75％海水浇灌下芦荟甙含量增加了3倍多，在50％海水和100％海水灌溉下，其含量也增加了2倍多；当海水浇灌浓度超过25％后，库拉索芦荟的生长明显受到抑制，生物量降低，抽苔期推迟，同时，海水浓度的增加也导致芦荟叶中累积大量Na~+，从而使得芦荟叶中Ca~(2+)含量降低，但Mg~(2+)并没有受到海水浓度的影响；用浓度低于75％的海水浇灌库拉索芦荟可以降低剖面深度在0-100cm之间的土壤盐度；其抗氧化保护酶中超氧化歧化酶的酶活力相对保持稳定，过氧化物酶的酶活力在10％海水浇灌下明显提高，随后则下降，而过氧化氢酶的酶活力则随海水浓度的升高而下降。

However, when reaction time is fixed, this system can follow Lambert-Beer Law within visible spectrum. Furthermore, it can not be affected by temperature. Based on these findings, CTAB Turbidness Method, a quick method to determine hyaluronic acid contents in fermentation broth is established.

研究表明，随着反应时间延长，反应体系的吸光度逐渐升高，但当反应时间固定后，在可见光区反应体系能较好的遵循朗伯－彼尔定律，并且不受温度的影响。

RESULTS:The 50%ethanolic extracts of 20 Chinese crude drugs were examined for inhibitory activity on tyrosinase.

应用多巴色素法测定对酪氨酸酶的抑制活性，底物为L-酪氨酸，在490 nm处测定吸光度。

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。