Sodium Acetate Stimulates PHB Biosynthesis in Synechocystis sp. PCC 6803

IntroductionA large variety of bacteria are able to synthesizepolyhydroxyalkanoic acids (PHAs) and to depositlarge amounts of these polyesters as insolubleinclusions in cytoplasm[1 ] . PHAs have attractedthe interest of the chemical industry because oftheir biodegradable properties for applications invarious technical,medical,and pharmaceuticalapplications[2 ] .Poly-β-hydroxybutyrate(PHB) isatypical PHA that is produced by heterotrophicbacteria,such as Alcaligenes eutrophus andEscherichi…     

基于C/S的FMS异构多数据源集成方法

异构多数据源集成是实现CIMS／FMS的关键技术之一。该文根据异构系统中不同应用领域对住处的不同需求，采用统一的C／S机制，建立一种数据库集成体系结构，实现异构分布环境下不同数据源之间的互操作，实现数据的共享与分布式处理，减少了系统的响应时间，取得了较好的实验效果。     

一种新型部分氮功能化氧氮杂大环的合成与表征

本文报道了一种新型部分氮功能化氧氮杂大环的合成,并对其结构进行了表征     

诱导不结瘤豆科树种结瘤固氮的研究

根据国内外有关诱导非豆科作物结瘤固氮的现状,结合作者几年来的工作,对诱导不结瘤豆科树种结瘤固氮的可行性进行了探讨,并报道了作者近年来人工诱导不结瘤的豆科树种—山皂荚(Gledtsia melanacantha)的试验结果。     

两种赤潮藻对温度、氮、磷营养的反应及活体荧光特性的研究

在实验室分批培养条件下,研究了温度及氮磷营养元素对两种赤潮藻增殖的影响,发现海洋原甲藻(Prorocentrum micans)要求的温度较低,其生长最适温度为23℃,生长温度上限在33℃至34℃之间;微小角毛藻(Chaetoceras minutissmus)的生长最适温度约为30℃,生长温度上限在41℃与44℃之间。氮磷缺乏使两种藻的增殖受阻,生长周期缩短,且缺氮比缺磷的影响大,测定表明两种藻的荧光激发光谱的高峰位置都在580nm附近,而荧光发射光谱的峰位为675nm.DCMU能引起两种藻活体荧光的增益,海洋原甲藻的增益荧光比率(F_D/F_X)为2.5,角毛藻的荧光比率较低,通常小于2.0。     

土壤氮素对小麦生育期硝酸还原酶活性的影响

硝酸还原酶（ＮｉｔｒａｔｅＲｅｄｕｃｔａｓｅ简称ＮＲ）是植物体内ＮＯ同化步骤中的第一个酶，也是整个同化过程中蛋白质合成的限速酶．ＮＲ活性的测定，不仅可以反应出小麦生育期氮素代谢的情况，而且可以反应出土壤及小麦生育期植株体内氮素供应水平和其它环境因子的效应．因此，ＮＲ活性可作为作物生育期氮素代谢的生理指标．     

Fuzzy cluster analysis of the provenance of ancient Yaozhou porcelain body

The technique of neutron activation analysis (NAA) has been employed to measure the content of 29 kinds of elements in the sample of Yaozhou porcelain bodies,Then a fuzzy cluster analsis has been conducted to the NAA data and a diagram of the dynamic fuzzy cluster analysis has been achived,The results indicate that the batch of ancient Yaozhou porcelain bodies,which were of different overglaze color and were produced by different kilns during a period of over 800 years from the Tang Dynasty (618-907 A.D.) to the Yuan Dyansty(1271-1368 A.D.) ,has shared a stable and concentrated raw material source,Provenances of porcelain bodies from different times ,though having their specific independence ,enjoy a close relationship and are not far from one another,Provenances of porcelain bodies made during the Tang Dynasty and the Five Dynasties (907-960 A.D.)are found to be closer to one another,while those of the Song (960-1279A.D.) and the Jin Dynasty (1115-1234 A.D.)are comparatively concentrated in certain areas and are different from those of the Tang Dynasty .Both the tri-colored glazed pottery made in Yaozhou kilns during the Tang Dynasty and the Yaozhou porcelain bodies of the Tang period are from the same provenance.     

组合式生物脱氮除碳法处理尼龙6废水

用包含水解酸化、硝化和反硝化三个反应器的组合式生物脱氮除碳系统处理尼龙6废水,着重分析了该系统的回流比,溶解氧。结果显示系统的最佳工艺参数为:回流比为3,反应器的溶解氧分别为0.5～1.0mg·L-1、3.0～3.3mg.L-1、1.8～2.3mg·L-1、,同时CODCr和TN的去除率分别为95.85%、61.04%。     

铁镍锆复合金属氧化物催化剂脱NOx性能研究

以浸渍法制备了Fe-O、Fe-N i-O、Fe-N i-Zr-O金属氧化物催化剂,考察了催化剂活性组分Fe的含量、反应温度、空速及催化剂的焙烧温度对催化剂催化活性的影响,并用XRD、BET技术对其进行了表征,结果表明催化剂Fe-N i-Zr-O比催化剂Fe-O、Fe-N i-O具有较好的脱除NOx的活性.