REE bound polysaccharides in leaves of Dicranopteris dichotoma by MAA

Ｉｎｒｅｃｅｎｔｄｅｃａｄｅｓ,ｔｈｅｐｈｙｓｉｏｌｏｇｉｃａｌｆｕｎｃｔｉｏｎｏｆＲＥＥｓａｎｄｔｈｅｉｒｓｉｇｎｉｆｉｃａｎｃｅｏｎｌｉｖｉｎｇｂｅｉｎｇｓａｓｗｅｌｌａｓｔｈｅｉｒｌｏｎｇｔｅｒｍｂｉｏｌｏｇｉｃａｌｅｆｆｅｃｔｓｏｎｂｏｄｉｅｓｏｆｌｉｖｉｎｇｂｅｉｎｇｓｈａｖｅｄｒａｗｎｇｒｅａｔａｔｔｅｎｔｉｏｎ.ａｃｃｏｍｐａｎｉｅｄｂｙｔｈｅｅｘｔｅｎｓｉｖｅａｐｐｌｉｃａｔｉｏｎｏｆＲＥＥｓｉｎａｇｒｉｃｕｌｔｕｒｅ,ｍｏｄｅｒｎｉｎｄｕｓｔｒｙａｎｄｍｅｄｉｃｉｎｅ.Ｈｏｗｅｖｅ…     

天然植物体中与稀土元素结合的DNA

利用分子活化分析方法 ,初步研究了稀土矿区植物铁芒萁叶中稀土元素(REE)与核酸的结合状态 .铁芒萁叶经过提取和生化分离纯化后 ,得到了与稀土元素结合的DNA(REE DNA) .用紫外光谱法鉴定DNA的纯度 ;用考马斯亮兰G 2 5 0光度法测定DNA中的蛋白质 ;并用琼脂糖凝胶电泳分离和检测DNA .同时 ,用仪器中子活化法 (INAA)测定了REE DNA中 8个稀土元素 (La ,Ce ,Nd ,Sm ,Eu ,Tb ,Yb ,Lu)的含量 .研究结果表明 ,用本生化分离流程及琼脂糖凝胶电泳可从铁芒萁叶中提取出纯度比较高的REE DNA ,并证明了稀土元素与DNA的结合是紧密的 .由琼脂糖凝胶电泳图谱可在分子量 2 2kb处得到一条清晰的REE DNA谱带     

中子活化分析测定油菜叶绿体中的微量元素

１　　引　　　　言微量元素如锰、铁和铜在植物光合作用中起重要作用,其在叶绿体中的含量与赋存状态已被广泛研究,但对叶绿体中其它微量元素的含量及对光合作用的影响研究较少。近年来,大量实验证明稀土元素能提高植物光合作用的能力,但叶绿体中是否含有稀土元素还不清楚。本工作分离并纯化了油菜的叶绿体,用中子活化分析测定了包括８个稀土元素在内的１９种微量元素的含量。２　　实验部分２．１　　仪器与试剂　　ＤＬ－７Ａ冷冻离心机（中国科学院武汉科学仪器厂）,７２１分光光度计（上海精密科学仪器有限公司）,高纯锗探测器及…     

分子活化分析研究铁芒萁叶中稀土结合多糖

利用分子活化分析技术初步研究了铁芒萁叶中稀土结合多糖的状态.铁芒萁叶经过提取和生化分离后,得到冷水溶性多糖,热水溶性多糖,酸溶性多糖和碱溶性多糖 将所得到的多糖脱蛋白后通过凝胶柱,比色法测定多糖的吸收曲线,并用中子活化法(NAA)测定多糖中的8个稀土元素(La,Ce,Nd,Sm,Eu,Tb,Yb和Lu)的含量.研究结果表明,铁芒萁体内稀土元素与多糖有紧密结合.经分子量测定,与稀土元素(REE)结合的多糖为小分子量多糖(1～2)×10~4u.     

REE bound DNA in natural plant

The binding of rare earth elements (REEs) with nucleic acids in the leaves of fern Dicranopteris dichotoma (DD) has been studied by molecular activation analysis (MAA). The REEs bound DNA (REE-DNA) was obtained from the leaves of DD. The CTAB-based procedure was modified for extraction of total DNA. The purity of DNA was examined by UV spectroscopy. The DNA obtained was separated and determined by agarose gel electrophoresis further. Meanwhile, the contents of eight rare earth elements (La, Ce, Nd, Sm, Eu,Tb, Yb and Lu) in REE-DNA were detected by instrumental neutron activation analysis (INAA). The results showed that REE-DNA with higher purity could be extracted from plant using this method. It was also found that REEs were bound firmly with DNA in the leaves of DD. The molecular weight (MW) of REE-DNA band was about 22 kb in agarose gel electrophoresis.