色质

Objective A specific and sensitive liquid chromatography-tandem mass spectrometry method was developed to determine streptomycin and dihydrostreptomycin residues in honey.

目的建立一种专属、灵敏的液相色谱-串联质谱法测定蜂蜜中链霉素和双氢链霉素的残留量。

The results of ESI-MS were identical to those of HPLC, which provided scientific basis for explanation of detoxicity of Glycyrrhiza uralensis Fisch and the reasonable combination of Strychnos nux-vomical L.

电喷雾质谱的实验结果与高效液相色谱的结果相吻合，为进一步阐明甘草解马钱子类药物毒性和马钱子合理配伍用药提供了科学的实验依据。

The trace organic pollutants in industrial waste water were separated and enriched by solvent sublation, and were determined by GC-MS in this paper.

采用溶剂浮选法对工业废水中痕量有机污染物进行分离富集，用气相色谱质谱联用法对其进行鉴定。

Object: A specific and sensitive liquid chromatography tandem mass spectrometry method was developed for the multiresidue determination of sulfisomidine, sulfapyridine, sulfamerazine, sulfamethoxazole, sulfisoxazole, sulfadiazine, sulfamethizole, sulfachlorpyridazine, sulfamethoxypyridazine, sulfadimethoxine, sulfamonomethoxine, sulfathiazole, sulfadoxine, sulfaquinoxaline, sulfanilamide, sulfaguanidine, sulfamoxole, sulfameter, sulfadimidine, sulfacetamide, sulfaphenazole, sulfanitran, sulfabenzamide and a potentiator, trimethoprim, in meat.

目的：建立猪肉中磺胺及其增效剂多残留检测的液相色谱-串联质谱法，包括磺胺二甲异嘧啶、磺胺吡啶、磺胺甲基嘧啶、磺胺甲基异噁唑、磺胺二甲异噁唑、磺胺嘧啶、磺胺甲噻二唑、磺胺氯哒嗪、磺胺甲氧哒嗪、磺胺间二甲氧嘧啶、磺胺-6-甲氧嘧啶、磺胺噻唑、磺胺邻二甲氧嘧啶、磺胺喹噁啉、磺胺、磺胺脒、磺胺噁唑、磺胺甲氧嘧啶、磺胺二甲嘧啶、磺胺醋酰、磺胺苯吡唑、磺胺硝苯、磺胺苯酰和甲氧苄氨嘧啶。

Sylvanite occurs in columnar, tabular and grained forms and assume polysynthetic twin with strong anisotropy and bireflectance.

针碲银金矿呈柱状、板状、粒状晶形，聚片双晶，具强非均质性及双反射和反射多色性，Hv50=216—219 kg/mm2。

A novel method for the determination of 5 pyrethroid pesticide residues in tobacco leaf and tea samples was established.

应用搅拌棒吸附萃取技术分别萃取烟叶和茶叶中的5种拟除虫菊酯，并利用热脱附系统将萃取到的物质进行热脱附，然后通过气相色谱-质谱联用仪进行分析测定。

The experimental conditions were optimized to produce following results: good linearity of sulfamethoxazole, norfloxacin, ciprofloxacin, ofloxacin and tetracycline in the range from 1.00 ng/L to 1 000 ng/L and the limits of quantification 1 ng/L, the good linearity of terramycin and aureomycin in the range from 10.0 ng/L to 2 000 ng/L and the LOQ 10 ng/L, the recoveries of deionized water and surface water from 72.1% to 112%, and the RSD from 0.6% to 9.2%.

摘要〗采用超高效液相色谱-电喷雾二级质谱联用技术同时测定水中7种抗生素，优化了试验条件。磺胺甲恶唑、诺氟沙星、环丙沙星、氧氟沙星、四环素在1.00 ng/L ～1 000 ng/L 范围内线性良好，定量下限为1 ng/L ，土霉素、金霉素在10.0 ng/L ～2 000 ng/L 范围内线性良好，定量下限为10 ng/L ，去离子水和地表水样加标回收率为72.1%～112%， RSD 为0.6%～9.2%。

Tris(4-aminophenyl) thiophosphate and its relative derivatives were synthesized and the optimum reaction conditions were selected in this paper. The products were characterized and analyzed by IR, NMR, MS and HPLC.

合成了硫代磷酸三(4-氨基苯)酯及其衍生物，通过优化实验确定了最佳反应条件，并用红外光谱、核磁共振波谱、质谱、高效液相色谱等谱学手段对合成产物进行了表征和分析。

Methods: Glipizide gliclazide glyburide glimepiride gliquidone repaglinide nateglinide pioglitazone rosiglitazone metformin phenformin and tolbutamide added in the blank ground samples were extracted with 80% methanol and were separated from an ACQUITY UPLC DBH C18 column with a gradient mobile phase of acetonitrile - 0.2 % formic acid water solution. A tandem quadrupole mass spectrometer equipped with electrospray ionization source was used in positive ion mode multiple reaction monitoring was performed to quantify above mentioned compounds.

被添加在中成药制剂及其包装物中的二甲双胍、苯乙双胍、罗格列酮、吡格列酮、格列吡嗫娶瑞格列奈、甲苯磺丁脲、格列齐特、格列苯脲、那格列奈、格列美脲、格列喹酮等西药成分用80%甲醇提取，以乙腈- 0.2%甲酸水溶液为流动相梯度洗脱，在ACQUITY UPLC DBH C18色谱柱上分离，串联四级杆质谱检测，MRM方式采集并定量。

Tryptophan is that chemical that is utilized by the brain in order to create the neurotransmitter known as serotonin.

色氨酸是一种能被大脑利用来产生神经递质--羟色胺的化学物质。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐