长白落叶松三种等位酶遗传型初步分析

长白落叶松三种等位酶遗传型初步分析张军丽（中国科学院沈阳应用生态研究所，沈阳１１００１５）本文采用淀粉凝胶电泳法，在酶水平上，利用“水平切片染色法”分析了长白落叶松（Ｌａｒｉｘｏｌｇｅｎｓｉｓ）自然群体单株采集种子胚乳的三种等位酶的遗化变化情况。对苹...

黄土高原灌木林地水分环境特性研究

通过对黄土高原试验示范区的多年定位观测试验 ,并结合调查数据 ,分析了该区灌木林地的土壤水分循环过程 ,大气降水分配特点 ,揭示了灌木林蒸腾耗水特征 ,以及土壤水分动态趋势 ,总结了沙棘、柠条灌木林地土壤水分平衡规律 ,从而为黄土高原绿化、灌木林的合理布局和经营提供了一定的科学依据。

施用镁、硼及硝基腐植酸对烤烟产量和品质的影响

以辽宁省昌图县横沟子乡先锋村烟田的土壤农化性状指标为参数，设计镁、硼素及硝基腐植酸作为烟草专用肥的添加剂，研究其对提高和改善烤烟产量、品质的影响，１９９１～１９９３年三年的田间试验表明，亩施硫酸镁、硼砂各０．５ｋｇ及硝基腐植酸３．５ｋｇ做基肥，移栽４０天，镁、硼处理区再分别喷施硫酸镁５００克（１％浓度），硼砂１００克（０．２％浓度），这三个处理区不论是烟株苗期生长的叶色、抗病力及成熟期烟叶落黄、烘烤效果，还是上等烤烟比重、化学成分含量等指标均有改善和提高。

Synthesis of Aromatic Oxide-Oxadiazoles Containing Pyridine Ring and Study on Their Spectral Properties

In order to explore new highly organic electroluminescent materials, six symmetrical aromatic oxide-oxadiazoles containing pyridine ring 4a similar to 4f were synthesized through cyclization of substituted benzoic acid (2) with 2,6-dihydrazide pyridine (3) by "one-pot" method in POCl3. Their structures were confirmed by MS, IR, H-1 NMR techniques and elemental analysis. The fluorescence spectra of the target compounds showed that the A,m ranged from 347 to 507 nm, and the maximum A,m were close to 384 nm, which showed that these compounds have good fluorescence with strong fluorescence intensity. When the 5-Br group was introduced into the aromatic ring (4e and 4f), the fluorescent emission wavelength took place Einstein shift, and the fluorescent intensity decreased a little. Using quinine bisulphate as a reference, the fluorescence quantum yields were all tested, and the introduction of 5-Br group had no visible effect on fluorescence quantum yield.

Characterization of the rutin-metal complex by electrospray ionization tandem mass spectrometry

According to the strong application background of bioflavonoid and metal-flavonoid complexes, novel electrospray ionization tandem mass spectrometry (ESI-MSn) was applied to investigate the structure and fragmentation mechanism of transition metal-rutin complexes. In the full-scan mass spectra, different stoichiometric ratios of rutin-metal complexes were found. In the reaction between rutin and Cu, four kinds of complexes with four different stoichiometric ratios were produced. In the reaction between rutin and Zn, Mn(II), and Fe(II), only two kind of complexes with stoichiometric ratios of 1:1 and 1:2 occured. In further tandem mass spectrometric experiments of different rutin-metal complexes, product fragments, came from the neutral loss of the external rhamnose and the internal glucose unit, oligosaccharide chain, aglycone, and small organic molecules. According to the MSn data, we proposed a mechanism for all fragments of the rutin-Cu complex A and the structure of two rutin-Cu complexes, C and D.