固氮鱼腥藻HB686固氮_放氢与谷氨酰胺合成酶的关系

固氮鱼腥藻HB686(Anabaena azotica HB686)的固氮和放氢被氨抑制与蛋氨酸砜亚胺(MSX)解除氨抑制的作用呈平行关系.谷氨酰胺能抑制固氮和放氢,而对谷氨酰胺合成酶(GS)和吸氢酶却有激活作用.固氮血腥藻在Mg~(2+)介质中的乙炔还原活性和放氢量皆比在Mn~(2+)介质中的高,而GS的活性则相反.不同波长的光照射对固氮、放氢和GS活性有不同的影响.     

山西的裸藻属植物

作者在本文中对山西省的裸藻属植物作一初步报道,计有16种,1变种。全部为山西省新记录。其中钝顶裸藻Euglena obtusa Schmitz为我国新记录。     

大型离心风机排风口噪音控制

本文根据大型离心风机辐射噪声的特点,针对矿井的具体情况在不破坏原风道,不影响通风的前提下,提出可行的综合治理方案.     

福建爬管藻属的研究

本文报道了产于福建沿岸的爬管藻属的一个新变种即赫伦伯爬管藻裸节片变种Herposiphonia hollenbergii var.interrupta var.nov.和一个中国新纪录即柔细爬管藻H.delicatula Hollenberg.     

内蒙古种子植物新纪录分类群

本文记载了内蒙古种子植物新记录科2个:沟繁缕科Elatinaceae和胡麻科Pedaliaceae;新纪录属5个:沟繁缕属Elatine、茶菱属Trapella、丁香蓼属Ludwigia、石龙尾属Limophila和水竹叶属Aneilema;新纪录种12个,为内蒙古植物区系的研究增添了新资料。     

念珠藻属Nostoc三个种早期发育的初步研究

本文对念珠藻属Nostoc中的三个种,即N.commune,N.muscorum和N.flagel-liformae,分别进行了十多次实验,结果表明三个种的早期发育过程基本相同,都要经过几个不同的发育阶段,然后形成球形胶群体,由此群体再发育为成熟的胶群体。     

文山红柱兰快速繁殖技术的研究

文山红柱兰授粉后180天的种子具有较高的萌发率,且1/3MS培养基显著优于其他基本培养基;基本培养基中添加10%的椰乳有利于种子的萌发;茎尖在MS NAA0.3 BA3.0(单位:mg/L,下同) 椰乳10%的培养基上诱导产生原球茎的几率最高;原球茎在MS NAA0.1 BA0.5的培养基上增殖,同时部分分化成芽;幼芽在附加5%香蕉汁和5%马铃薯汁的1/2 MS培养基上诱导出根而再生完整小植株。     

A light-harvesting siphonax-anthin-chlorophyll a／b-protein complex of marine green alga, Bryopsis corticulans

A light-harvesting chlorophyll a/b-protein complex (LHCP) was isolated directly from thylakoid membranes of marine green alga, Bryopsis corticulans, by two consecutive runs of liquid chromatography. The trimeric form of the light-harvesting complex has been obtained by sucrose gradient ultracentrifugation. The result of SDSPAGE shows that the light-harvesting complex is composed of at least five apoproteins in which a protein with apparent molecular weight of about 31 kD was never found in the major light-harvesting complex (LHC II ) from higher plants. The isolated Bryopsis corticulans light-harvesting complex contains a specific carotenoid, siphonaxanthin, as well as chlorophyll (Chl) a, Chl b, neoxanthin and violaxanthin. Siphonaxanthin which is present in the light-harvesting siphonaxanthin-chlorophyll a/b-protein complex of Bryopsis corticulans is responsible for enhanced absorption in the blue-green region (530 nm). Efficient energy transfer from both siphonaxanthin and Chl b to Chl a in Bryopsis corticulans LHCP, which has similar absorption and fluorescence emission spectra to those of the lutein-chlorophyll a/b-protein of higher plants, proved that molecular arrangement of the light-harvesting pigments was highly ordered in the Bryopsis corticulans LHCP. The siphonaxanthin-chlorophyll a/b-proteins allow enhanced absorption of blue-green light, the predominant light available in deep ocean waters or shaded subtidal marine habitats.     

Contributions of DPOR at Low Light Intensi.ty to Chlorophyll Biosynthesis and Growth in the Synechocystis sp. PCC 6803

Introduction Chlorophylls (Chls) and bacteriochlorophylls (Bchls) are two of the most abundant classes of natural pigments, and their biosynthesis is a major metabolic activity in the ecosystem[1]. Protochlorophyllide (Pchlide) is an intermediate in the Chl and Bchl biosynthetic pathway of photosynthetic organisms and its reduction to chlorophyllide (Chlide) is a key regulatory step in the Chl biosynthesis pathway. In this reaction, the porphyrin D-ring of Pchlide is converted to chlorin b…