查询词典 nanogram

A simple, rapid and reproducible multiresidue analytical method for the determination of pyre-throids at low nanogram levels in vegetable and fruit is described.

引 言拟除虫菊酯是一类重要的合成杀虫剂，具有高效、广谱、低毒和生物降解等特性，主要用于防治棉花、蔬菜和果树的食叶和食果害虫。

The electrochemical quartz crystal microbalance has been well established as a powerful tool capable of tracing an electrode-mass change down to the nanogram level in electrochemical processes.

电化学石英晶体微天平是能够现场响应电化学过程中电极表面纳克级质量改变的强有力的工具。

Using nanogram quantities on total RNA, the usage of dIVT protocol preserved about 70% information of gene expression when compared with those detected by the one-cycle T7 RNA linear amplification.

从纳克量级的总RNA起始，本方法和常规的RNA单轮线性扩增法相比，仍然准确地保留了约70%的基因表达信息。

After magnetite incorporation, the porous microparticle is still empty enough to accommodate nanogram quantities of a molecular payload; the enzymes horseradish peroxidase or pronase E are used in the present work.

结合有磁铁矿的多孔微粒仍然具有足够的空间负载纳克量的分子；本研究使用的是酶素辣根过氧化物酶或链酶蛋白酶。

In the fourth chapter , we studied the resonance light scattering spectral characteristic of patent blueⅤ- Cetyltrimethyl ammonium bromide-nucleic acid system, and the elementary reaction mechanism with absorption spectra method and 1H NMR spectra method. Another new determination method of nucleic acid at nanogram level was established.

第四章研究了五号专利兰-十六烷基三甲基溴化铵-核酸体系的共振散射光谱特征，并结合吸收光谱法、核磁共振光谱和一系列条件实验探讨了它们的作用机理，建立了一种测定纳克级核酸的新方法。

Results: The four linear calibration curves were obtained over the range 0.025μgml^(-1) to 3.2μgml^(-1) of amphetamines (amphetamine, methamphetamine, MDMA, MDA) in urine (r=0.9977-0.9998). The recoveries of the assay were better under different concentrations and the lowest concentration of detection reached the level of nanogram.

结果：4种苯丙胺类药物在尿药浓度为0.025-3.2μgml^(-1)范围内标准曲线的线性关系良好(r=0.9977-。09998)；高、中、低3种浓度各标准药物的回收率较高；日内、日间精密度的BSD基本符合小于10%的要求；最低检测浓度能够达到纳克级，具有较高的灵敏度。

As endogenous jasmonates exist in enantiomers in nature and at level of nanogram/per gram fresh weight, it is very challenging work to develop rapid and accurate method for qualitative and quantitative analyses of JAs. This review paper summarizes the recent advances in the analysis of jasmonates including chromatography, capillary electrophoresis, chromatography-mass spectrometry and immunoassay.

内源茉莉酸类激素通常以多种手性异构体存在，且含量超微，因此，对内源性茉莉酸类激素进行准确的定性、定量分析具有很大的难度，研究高效分离富集、高灵敏度检测以及分离与检测联用等分析方法，对加速植物激素分子作用机理研究具有重大意义。

The isothermal kinetics of nanogram obtained by MA has been studied in section three. The grain growth of α solid solution of Fe〓CuNb〓Si〓B〓 powders is controlled by a single kinetics within the experimental temperature range, the activation energy for grain growth is 80.3kJ/mol, magnetic properties of powders at different annealing and milling conditions are measured, a preliminary effort has been given to the consolidation of Fe〓CuNb〓Si〓B〓 powders.

第三部分研究了机械纳米晶化粉末的等温晶粒长大动力学，在实验研究的温度范围内，Fe〓CuNb〓Si〓B〓纳米晶α固溶体的晶粒长大由单一的动力学过程所控制，其晶粒长大激活能为80.3kJ/mol，研究了不同球磨条件及热处理条件下纳米晶粉末的磁性，对纳米晶粉末的成型进行了初步的尝试。

This protein has broad-spectrum insecticidal activities on Lepidoptera pests with the toxic activity of nanogram levels, which acts on brush border membrane vesicle in midgut epithelial cells of sensitive insects and eventually leads to the formation of ion channels.

VIP3A对鳞翅目害虫具广谱杀虫活性，可作用于敏感昆虫中肠上皮细胞刷状缘膜囊致离子通道的形成，杀虫活性达纳克级水平。

Hong Kong GP Dr Lauren Bramley claims that around 70-80 percent of her patients have a vitamin D level below the healthy benchmark of around 50ng/ml (nanogram of vitamin D per milliliter of blood).

另外，深色皮肤的人是危险的，因为深色皮肤的人黑色素运作象太阳阻拦防止UVB光芒那样阻止维生素D。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。