KCl提高春小麦根系活力的研究

本试验用40M mol/L KCl溶液加入到赤霉素(GA)、吲哚乙酸(IAA)、2,4,5——三氯苯氧乙酸(2,4,5——T)、玉米素(Zt)溶液中,均会提高春小麦根系活力。     

咔唑-呋喃-噻吩以及吲哚-呋喃-噻吩齐聚物的合成

五氟苯和五氟溴苯是公认的代表性的含氟化合物,可以通过多种反应与其它化合物相连接。N-芳化杂环化合物例如咔唑和吲哚是具有空穴传输性能、在紫外光范围有很强的吸收并且具有发可贵的蓝光等特性。以咔唑为侧基的非共轭类聚合物具有很好的光学性能和空穴传输性能。呋喃噻吩齐聚物具有优异的性质。该文发展了合成咔唑-呋喃-噻吩以及吲哚-呋喃-噻吩齐聚物的方法。以自制的五氟苯代吲哚和五氟苯代咔唑为起始原料,与硼试剂反应分别制备相应的硼酸酯。通过溴封端的噻吩-氟代呋喃-噻吩中间体与硼酸酯反应制备咔唑-呋喃噻吩以及吲哚-呋喃-噻吩齐聚物。     

长白山牛皮杜鹃无性繁殖及异地引种试验

对牛皮杜鹃无性繁殖及人工引种驯化进行试验研究,结果显示:牛皮杜鹃无性繁殖使用IAA 100 mg/L处理20 min,在土壤使用人工客森林腐殖土与珍珠岩各占50%,遮光50%,平均气温19℃,平均地温16.5℃条件下的生根率达56%.对照组清水浸泡20 min,生根率达52%;培养土的组合以森林腐殖土与珍珠岩各占50%的生根效果最好;根段没有一个发芽,说明在无叶的前提下即使有芽苞,由于没有叶的光合作用也不可能发芽;异地引种经过3 a物候监测,生长缓慢,不易推广.     

吲哚3—丙酸邻菲啰啉钇三元配合物的合成及性质

本文报道首次合成钇三元配合物,经过元素与化学分析,确定配合物组成为:YP_3(phen)(P为吲哚—3—丙酸根,phen为邻菲啰啉)。通过化学分析、红外光谱。热谱,~1HNMR谱、X-射线粉末衍射等方法对新合成三元配合物的结构及性质进行了研究。     

The structure of scytonemin,an ultraviolet sunscreen pigment from the sheaths of cyanobacteria

Despite knowledge of the existence of the pigment called scytonemin for over 100 years, its structure has remained unsolved until now. This pigment, the first shown to be an effective, photo-stable ultraviolet shield in prokaryotes, is a novel dimeric molecule (molec. wt. 544) of indolic and phenolic subunits and is known only from the sheaths enclosing the cells of cyanobacteria. It is probable that scytonemin is formed from a condensation of tryptophan-and phenylpropanoid-derived subunits. The linkage between these units is unique among natural products and this novel ring structure is here termed the scytoneman skeleton. Scytonemin absorbs strongly and broadly in the spectral region 325–425 nm (UV-A-violet-blue, with an in vivo maximum at 370 nm). However, there is also major absorption in the UV-C ( _max=250nm) and UV-B (280–320 nm). The pigment has been recently shown to provide significant protection to cyanobacteria against damage by ultraviolet radiation. The pigment occurs in all phylogenetic lines of sheathed cyanobacteria and possibly represents a UV screening strategy far more ancient than that of plant flavonoids and animal melanins. How diverse organisms deal with UV radiation is considered of vital importance to global ecology.     

氧化镁助剂对一步法合成吲哚的Cu/SiO2催化剂性能影响的研究

采用分步等体积浸渍法制备了Cu／SiO2-MgO催化剂，并将其用于一步法合成吲哚的反应．结果表明，当Cu／SiO2-MgO催化剂中含摩尔比0．25％铜担载量的MgO助剂时，焙烧温度为500℃，并在150℃下经混合气还原后，其催化性能最佳，吲哚的收率可达96％；当Cu／SiO2-MgO催化剂中的晶体达到一定结晶度时，其选择性很高，铜晶体的结晶度过高或过低都会导致副产物增多，吲哚的选择性降低．同时，加入氧化镁助剂能提高催化剂的稳定性．