The influence of Fe^2＋ on growth and development of cells enzymatically isolated from Porphyra yezoensis blades

Fe^2＋ acted as an accessorial factor for many cellular enzymatic reactions is very important for seaweed growth and development, but the Fe^2＋ requirement in nori had not been seen. Porphyra yezoensis cells were separated enzymatically and cultured in a series of sterilized seawater media containing various concentrations of Fe^2＋. The growth development and cell were investigated in this work. Through this experiment, two biologically-meant concentration scales were found, one is low concentrations, 12.1-102.1μg/L, 10-100 times than that in seawater, favoring the development of isolated cells of Porphyra and the other was high concentrations, more than 10mg/L inhibiting the cell growth, leading to the deformity and shrinkage of the cells. At the concentration of 50 mg/L, the cells stopped growing and died eventually.     

酸浸法提取硫酸镍的新工艺流程与实践

我国金属镍的生产起步较晚,产量较低,并且有限的镍矿在开采、选矿、冶金中,产出了大量的含处废石、尾石及冶炼炉渣等,开发利用这些废物,搞好镍资源的二次回收,既能减少环境污染,又能获得较好的效益。对青海省拉水峡铜镍矿低品位选矿尾砂进行稀酸浸取提纯,生产结晶硫酸镍产品,镍一次浸出率达75％以上,总回收率近70％。中试流程简单,生产成本较低,产品质量较高,为从低品位镍矿和含镍废料中回收镍提供了范例。     

氨基多糖的研究方法

氨基多糖 ,又称糖胺聚糖 (Ｇｌｙｃｏｓｏｍｉｎｏｇｌｙｃａｎ ,ＧＡＧ)、粘多糖 (Ｍｕｃｏｐｏｌｙｓａｃｃｈａｒｉｄｅｓ) ,是蛋白聚糖 (Ｐｒｏｔｅｏｇｌｙｃａｎ ,ＰＧ)分子结构中的“含糖片段” ,通过共价键 (糖肽键 )与蛋白聚糖的核心蛋白连接 ,是动物体内特有的含有氨基的生物大分子物质[1] 。ＧＡＧ具有抗肿瘤、抗凝血、降血脂、增强免疫等多种生物活性 ,已引起了世界医药界和食品界的广泛关注。但由于ＧＡＧ的结构复杂及以往研究技术的不足 ,直到近 2 0～ 30年 ,人们才从多种海洋动物中提取分离ＧＡＧ ,对其分离纯化方法、理化性…     

树脂分离—原子荧光测定含金地质样品中微量锡

在酸性体系下溶样，５０６硫脲盐阴离子交换树脂分离Ａｕ等干扰组分。拟定了含Ａｕ地质样品中测定微量锡的氢化物－原子荧光分析法。方法检出限〈１×１０＾－６。     

一种新颖的软磁盘驱动器写预补偿及数据分离电路

在研制开发８０９８单片机接软盘磁盘驱动器的电路中，对ＩＢＭＰＣ／ＸＴ机的磁盘驱动器接口卡做了仔细研究。该卡的两上主要接口部分：写预补偿和数据分离电源的原理，结构都较复杂，不易移植。为此研制了两种替代电路。其设计思想还可以被其它类似的电路所借鉴。文章详细讨论了这两个的工作过程，并给出了数据分离电路完整的时序图。     

地质年龄测定中高Rb／Sr样品部分除铷处理方法

介绍了地质年龄测定中对高Ｒｂ／Ｓｒ样品，用吸附了六硝基二苯胺的阴离子交换树脂除去部分铷元素的新方法，从而实现样品在阳离子交换柱上的铷锶安全分离。该方法可解决Ｒｂ／Ｓｒ〉２０样品在质谱分析测定中＾８７Ｒｂ干扰＾８７Ｓ的问题。