东南亚含锡矿物

<正> 所谓“复杂锡矿石”,是指由多种矿物组成的、并以锡矿物为主的、具有复杂结构的锡矿石。对锡矿石,特别是对复杂锡矿石的矿物组成及其特征进行研究,对于指导矿床评价和采选利用有很大的意义。东南亚地区(以下简称“本区”——译者注)含锡矿物可分为以锡为主要成份和非主要成份的两组。前者包括锡石和锡石的变种——木锡矿、四方黄锡矿、其它锡的硫盐、马来亚石以及水锡石;后者系指产于花岗岩类中的含锡云母、钛铁矿、锆石等矿物。此外,还     

地球物质和地外物质中稀有气体的研究 为什么要研究以及如何进行研究?

<正> 稀有气体在陨石研究中总是起着重要的作用。作为一种介绍,让我举两个例子来证明这一点。 1898年Ramcay在其论文中报道他企图在铁陨石中找到氦元素。因为那时氦元素已被人们所发现,并且被认为是我们太阳系的主要组份。然而他在一些铁陨石中并未找到氦,于是宣布,这些特殊的陨石不是来自太阳而是来自其它星球。今天我们认为,这一结论至少是很不成熟的。 第二个例子是一个近期的例子。有些种类的陨石长期以来被认为含有大量的稀有气体。在过去的几年     

电感耦合氩等离子体/原子发射光谱(ICAP/AES)法测定地质样品中的稀土元素

<正> 在火成岩系统的岩石成因研究中,需要精密而准确地测定稀土元素。电感耦合氩等离子体光学发射光谱法(ICAP/OES)可测定全部稀土元素和钇。发表的检出限表明,这种方法可以满足岩石成因研究中分析地质样品所需要的理论灵敏度。但迄今用 ICAP/OES 所做的研究,不是对岩石成因研究中分析稀土元素所要求的检出限不能充分满足,就是不能包括全部稀土元素。     

离子微探针质量分析仪(IMMA)是地球化学工作者的最终武器吗?

二十世纪五十年代后期电子探针X射线显微分析仪的出现宣告了分析地球化学的一次革命。在这之前,化学地质工作者还不得不使用速度慢而往往又是很复杂的化学方法来分析从岩石中分离出来的纯度可疑的矿物相。很快,R.卡斯塔林(Castaing)提出了令人鼓舞的电子探针概念,为化学工作者提     

Managing international collaboration for the development and application of environmental technologies: opportunities for China & other Asia Pacific countries

Increased international cooperation in the field of contaminated site management has resulted in the formation of numerous networks and fora. The key benefits of increased co-operation are perceived to be in the reduction of duplication in efforts, particularly related to industry, in the co-ordination of contaminated site research, policy development and information dissemination. The paper introduces and briefly discusses key networks and collaborative projects currently in operation throughout the world relating to contaminated site management. The experience shared within these groups should prove useful to the application of such environmental problems in China and the Asia-Pacific region.     

25、用电化学气相色谱法检测ppm和ppb级的H_2S

本文论述了H_2S的气相色谱分析用的电化学检定器,讨论了此检定器的运行特性。此检定器的运行是以测定H_2S在一个扩散电极上的电化学氧化电流为基础的。检定下限是3×10~(-12)克H_2S,精确度为0.5％,分析可在2分钟内完成。准确度主要受约于校正样品的制备和是否有标准参考气体混合物。     

瑞士格劳宾登提劳恩的同变质铀矿化

<正> 铀矿化体产于瑞士格劳宾登前莱茵河谷施兰斯村南坡脚提劳恩地区的碎屑岩中。该矿点是1962年发现的,已打了三个浅钻孔。本文报道对提劳恩铀矿点的一组标本所进行的岩石学、矿物学及 X 光研究结果。并对距其西南约1.5公里,产状相似的特伦矿点做了对比研究。特伦矿点产于塔韦茨山的变质岩中,其主要矿化年龄为303—329百万年,据认为矿化是在华力西变质作用期间的高温热液条件下,由于近矿围岩中金属的活化而形成的。     

Cytoskeletal elements in the bacterium Mycoplasma pneumoniae

Mycoplasma pneumoniae is a pathogenic eubacterium lacking a cell wall. Three decades ago, a "rod", an intracellular cytoskeletal structure, was discovered that was assumed to define and stabilize the elongated cell shape. Later, by treatment with detergent, a "Triton shell" (i.e. a fraction of detergent-insoluble cell material) could be obtained, believed to contain additional cytoskeletal elements. Now, by application of a modified Triton X-100 treatment, we are able to demonstrate that M. pneumoniae possesses a cytoskeleton consisting of a blade-like rod and a peripheral lining located close to the inner face of the cytoplasmic membrane, exhibiting features of a highly regular network. Attached "stalks" may support the cytoplasmic membrane. The rod was connected to the cell periphery by "spokes" and showed a defined ultrastructure. Its proximal end was found to be attached to a wheel-like complex. Fibrils extended from the proximal end of the rod into the cytoplasm.     

Metal removal studied by a laboratory scale immobilized microalgal reactor

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A new maniraptoran dinosaur from China with long feathers on the metatarsus

The unusual presence of long pennaceous feathers on the feet of basal dromaeosaurid dinosaurs has recently been presented as strong evidence in support of the arboreal–gliding hypothesis for the origin of bird flight, but it could be a unique feature of dromaeosaurids and thus irrelevant to the theropod–bird transition. Here, we report a new eumaniraptoran theropod from China, with avian affinities, which also has long pennaceous feathers on its feet. This suggests that such morphology might represent a primitive adaptation close to the theropod–bird transition. The long metatarsus feathers are likely primitive for Eumaniraptora and might have played an important role in the origin of avian flight.Electronic Supplementary Material  Supplementary material is available for this article at