测定时间

The activity of magnesia has been determined and researched by the citric acid method and three different hydrated methods.

采用柠檬酸法和三种不同水化法测定了氧化镁的活性，阐述了氧化镁活性与煅烧温度、煅烧时间之间的关系。

This paper takes conchocelis of Porphyra yezoensis as experiment material, analyzes the toxicity of heavy metal ions on 6 parameters of chlorophyll a content, soluble protein content, mannite content, peroxidase activity, malonaldehyde content and the growth of conchocelis. In experimental conditions, samples were exposed to mercuryHg~(2+, copperCu~(2+, cadmium Cd~(2+, plumbumPb~(2+ and zincZn~(2+ at different concentrations and were taken after exposure for different hours.

本文以条斑紫菜丝状体为实验材料，测定条斑紫菜丝状体中叶绿素a含量、可溶性蛋白含量、甘露醇含量、过氧化物酶活性、丙二醛含量及藻体生长情况6项生理生化指标，研究分析了不同处理浓度和不同培养时间下重金属离子Hg~(2+)、Cu~(2+)、Cd~(2+)、Pb~(2+)、Zn~(2+)对条斑紫菜丝状体的毒性效应。

The maximum relative standard deviation of R〓 for C〓 to C〓 hydrocarbons was 0.5%.

恒温连续测定C〓～C〓烃在这种柱上保留时间变化的最大相对偏差为0.5%。

The method on trans fatty acids analysis in food is very important. The effects of methylate sodium, potassium hydroxide, sulfuric acid and boron trifluoride in methanol and their different concentration and dosage on TFA analysis were studied. The chromatographic condition and the influence of time and temperature on the esterifation of TFA using boron trifluoride in methanol were optimized. A method for analyzing TFA were established by GC based on boron trifluoride in methanol and RT-2560(100m×0.25mm×0.2μm) capillary column.

研究了甲醇钠－甲醇、氢氧化钾－甲醇、浓硫酸－甲醇和三氟化硼－甲醇4种甲酯化试剂的浓度、用量及甲酯化时间和温度对反式脂肪酸检测的影响，优化了色谱条件，建立了以三氟化硼－甲醇法甲酯化，RT-2560(100m×0.25mm×0.2μm)毛细管柱为基础的反式脂肪酸气相色谱检测方法，C18：1-9 t， C18：1-11 t， C18：2-9 t， 12 t和C22：1-13 t 4种反式脂肪酸的最小检出浓度在0.774.08 mg/kg之间。4种反式脂肪酸不同添标浓度回收率为98.44%101.23%，重复测定的相对标准差在0.22%1.31%之间，有较好的准确度和重现性。

A new technique for measuring COD of refinery waste water with microwave sealed digestion apparatus was developed using copper sulfate as catalyst.

建立了以CuSO4-MgSO4为催化剂、800W微波功率进行一定时间的微波消解测定炼油污水的化学需氧量的新方法。

Acid concentration in hydrolysis, the temperature and the time were important factors influencing the measurement results of monosaccharide content.

葡聚糖的纯度一般由酸水解后的单糖含量表示，水解时酸的浓度、温度和时间是影响单糖含量测定结果的重要因素。

Researchers from Montpellier University in France travelled to Senegal, where they used questionnaires, photography and, bizarrely, body odour to determine how much time fathers invested in their children and how much of a family resemblance there was.

来自法国蒙彼利埃大学的研究人员在塞内加尔采用问卷、照片以及奇异的身体气味的方式来测定父亲们花多少时间与他们的孩子在一起以及存在多少家族相似性。

Results: Muscone could pass through the normal rat's blood brain barrier into the brain and soon reached the highest peak and remained in higher concentration, and more slowly metabolized as compared with other organs.

用麝香的主要有效成分麝香酮，经大鼠尾静脉注射，按不同时间取其脑等内脏，制备组织样品，用气相色谱法测定其透过血脑屏障的脑内分布和其他脏器分布。

Methods To cultivate the rat cortical neurons and establish a model of brain nerve cell injury in vitro.

目的 建立体外培养大鼠脑神经细胞损伤模型，测定损伤前后不同时间LDH的水平，研究金路捷对脑皮质神经元的保护作用机制。

Methods The sciatic nerve trunk of toad was isolated and stimulated with electricity of varied parameters. The time required was investigated for the action potential to reduce its conduction velocity by 20% and to extend the latent period by 20% respectively.

用不同的电刺激参数刺激坐骨神经干，测定引起的动作电位的幅度和传导速度分别衰减20%以及潜伏期延长20%时所需的时间。

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。