查询词典 pyridine

The synthesis of furil from 2-furaldehyde using VB1 as the catalyst and CuSO4.5H2O-pyridine as the oxidant was studied.

以糠醛为原料，VB1为催化剂，利用安息香缩合反应合成糠偶姻，再用硫酸铜-吡啶氧化得到糠偶酰。

The pyridine hemochrome spectrum indicated the presence of protoheme Ⅸ as the prosthetic group.

吡啶血色素光谱显示了酶分子以原卟啉Ⅸ作为辅基。

Preliminary bioassay showed that all the synthesized compounds just showed a poor inhibition rate (0~45%) at 500 mg/L, much weaker than (72%~87%). The result suggested that chloro-atom on 2-position of pyridine ring may be indispensable for herbicidal activity.

初步除草活性测定结果表明，在500mg/L剂量下，所有化合物的除草活性（抑制率0~45%）远低于先导化合物（抑制率72%~87%），说明吡啶环2-位上的氯原子可能对维持该类化合物的除草活性是必需的。

In contrast to S- and O-heterocyclic compounds, increasing ionic strength reduced the sorption of ionizable N-heterocyclic compounds (pyridine, 2-methylpyridine, quinoline, 2-methylquinoline, and isoquinoline), due to increased electrostatic competition by cations.

对比硫和氧类杂环物质，提高离子强度会减少杂环化合物的吸收（吡啶、2甲基吡啶、喹啉、2甲基喹啉和异喹啉）这主要是由于阳离子的静电竞争。

In this thesis, five polydentate ligands including azido, oxalate, terephthalic acid, isophthalic acid and Pyridine-2,6-dicarboxylic acid were used to construct new transition metal complexes (M = Ru, Fe and Zn). Eight new complexes as listed below were synthesized and fully characterized.

本论文以草酸根、叠氮根、对苯二甲酸、间苯二甲酸和吡啶-2，6-二羧酸等含O、N的多齿共轭配体为研究对象，合成了以下八个结构新颖的化合物，并对它们的结构和谱学性质进行了详细的表征。

Methods: Co1umn: Berger PYR(Ethyl pyridine, 250mm×4.6mm, 6μm); Mobile phase: CO2-methanol with 0.2% isopropylamine (77:23), Pressure: 100bar, Temperature: 35℃, Flow: 2.0mL/min, Detection wavelength: 225nm.

色谱柱：Berger PYR（乙基吡啶柱，250mm×4.6mm，6μm），流动相：超临界CO2-0.2%异丙胺甲醇(77：23)，压力：100bar，温度：35℃，流速：2.0mL/min，检测波长：225nm。

Calculation showed t hat corrosion inhibition increased with the decrease of negative net charge of N atom; Efficiency of inhibition increased with the increase of negative net char ge of pyridine ring in isoquinoline molucular.

计算表明：随着N原子负的净电荷的减小，缓蚀效率提高；随着异喹啉等分子的吡啶环负净电荷的增大，缓蚀效率增高。

Using copper sulfate as catalyst, pyridine-3, 4-dicarboxylic acid was synthesized by oxidizing isoquinoline with concentrated nitric acid at high temperature, and the yield was 71.4%.

在钼酸铵存在下，采用固相烘焙法，2，3-吡啶二甲酸和3，4-吡啶二甲酸分别与尿素和氯化亚铜作用得到了氮杂铜酞菁。

Based on analysis of degradation and transformation of organic compounds in coke plant wastewater through every stage of the A 1 A 2 O biofilm system,several typical nitrogen heterocyclic compounds (pyridine,indole,quinoline,isoquinoline,2\|methyl quinoline and 8\|hydroxyl quinoline) in coke plant wastewater were selected for the study.

在对焦化废水中有机物在A1 A2 O生物膜系统中降解转化规律进行分析的基础上，选取焦化废水中 6种主要的含氮杂环化合物：吡啶、吲哚、喹啉、异喹啉、2 甲基喹啉、8 羟基喹啉，与苯酚共同配制成溶液，在A1 A2 O生物膜系统中运行，结果表明上述几种含氮杂环有机物在A1 A2 O系统中都可得到较完全的去除。

Pymetrazine is chosed as the lead compound, and 21 compounds were firstly designed and synthesized. These compounds were characterized by introducing phenyl derivatives with different functional groups to replace pyridine ring with the isosteric principle and the method of homogeneous synthesis and reasonable biologically designing in order to find new compounds with potential biological activity. These compounds were confirmed by IR, H NMR and MS spectra.

本文选取吡蚜酮为先导化合物，运用电子等排理念，综合类同合成、生物合理设计的方法，引入含有不同官能团的苯基衍生物替代吡蚜酮的结构中心吡啶环，设计合成了21个未见文献报道的化合物，寻找具有潜在生物活性的新三嗪酮类化合物，通过核磁共振氢谱、红外光谱、质谱等手段进行了结构表征，并验证正确。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。