饲钙厂磷酸萃取装置的工艺改进

针对饲料级磷酸氢钙生产的特点,提出了对与之相配套的磷酸萃取装置的改进:在原萃取磷酸工艺中增加预反应过程和分离过程,磷矿粉(浆)先加入预反应器中,与过滤后的所有滤酸混合,以使矿中部分CaO溶于磷酸生成磷酸二氢钙;经分离,将未分解的大部分磷矿送萃取系统制磷酸,溶液脱氟、除杂后用于制备磷酸氢钙以节约酸耗与石灰消耗。技改后,改善了石膏结晶状况,过滤强度由350～400kg(干基)/(m2·h)提高到500～650kg(干基)/(m2·h);还可用MgO偏高的低质磷矿。     

Thin layer chromatographic procedure for class separation of plant neutral lipids

A thin layer chromatographic method has been developed for the class separation of plant neutral lipids. Utilizing a two-step development in one dimension, lipid mixtures are separated into hydrocarbon waxes, steryl esters, methyl esters, triglycerides, fatty acids, diglycerides, sterols, and monoglycerides. The method may be employed for either qualitative or preparative purposes.     

European federation of biotechnology: Achievements and the future of European biotechnology

This Society of Chemical Industry Biotechnology Group Symposium held on 26 January 1987, at the SCI in London, aimed to review the achievements of the European Federation of Biotechnology (EFB) and consider its role in the future of European biotechnology.     

Global aspects of biotechnology

The attention given by the media to the turbulence caused by the current moves towards political independence often obscures the fact that a range of major problems, as well as powerful economic and technical forces, point towards increased levels of interdependence. Those two trends breed contradictions that inspire debates which actually give little room for considering the long-range impact of science and technology. This is quite a serious matter, since the developments in some areas, like microelectronics and bioengineering, will obviously have such far-reaching effects. Both rich and poor countries realise that such dynamic areas will sharpen the competitive edges between nations, but their potential for solving some common problems tends to be pushed into the background. In an effort to compensate for this tendency not only EEC through FAST, but also UNIDO has, however, recently initiated a series of reviews of the implications that various emerging breakthroughs will have on the economic growth and life-styles both in developed and in developing countries. A few points that have emerged from the microbiology study and particularly the significance of biotechnology at the interphase between communications and settlement planning are highlighted.     

国内外聚苯乙烯共混改性研究进展

综述了国内外聚苯乙烯（PS）树脂的生产、应用及新品种的开发情况,重点讨论了PS的各种增韧方法,分析了低顺式聚丁二烯橡胶、高顺式聚丁二烯橡胶、复合橡胶、三元乙丙橡胶、纳米复合材料及其他材料对PS的改性,对PS及其相关技术开发提出了建议。     

塑料改性技术新动态

目前,世界各国科学界和产业界都已意识到塑料材料与环境协调发展的重要性,正致力于开发好的性价比的塑料材料,提高其使用寿命,最大限度地减少塑料的使用量,并充分利用塑料的可塑性,回收并综合利用废弃的塑料材料,减少塑料材料对环境的压力。通过塑料改性技术,可以降低塑料制品的成本,增加功能性,开发出环境友好型塑料材料,减轻原料成本上升以及环保给塑料工业带来的双重压力。在全球降解塑料产业化条件尚不十分成熟的今天,塑料改性技术其研究与应用越来越受到行业的关注和重视。     

浅议氨基酸的实际应用

氨基酸是人体必需的一类重要化合物，其实际用途日益广泛，特别在食品，化妆品等方面有较大发展 。     

The potential of L-form bacteria in biotechnology

L-form bacteria include both stable and unstable cell wall-less variants of native walled bacteria. These organisms have been implicated as etiologic agents in both plant and animal diseases. L-form bacteria may also be used to protect plants or animals against disease-causing organisms, or to act as a host bacterium for the production and secretion to the growth medium of recombinant proteins. This article summarizes the fundamental biology of these unusual bacteria and discusses their potential uses.     

丁腈橡胶耐油性改性研究进展

该文综述了丁腈橡胶耐油改性研究的最新进展,简要介绍了丁腈橡胶（NBR）的发展状况、化学结构以及生产工艺,重点阐述了NBR／PVC、NBR／PP、NBR／ECO以及NBR／CSM等共混改性的研究进展以及氢化丁腈橡胶和羟基丁腈橡胶等新型丁腈橡胶品种的发展状况,并指明了丁腈橡胶耐油改性研究的发展方向。     

生物产业发展中的系统论

以系统论为方法,分析了生物产业的特点,结合工业生物技术的成果,说明系统论在生物过程中的应用实例及其突出成效。并通过与传统石油化工的比较,说明系统论用于生物化工具有重要意义。用系统论的方法总结了生物产业中的有益经验,对生物产业进行了展望。     

The role of microbial physiology in biotechnology

Commercially available calorimetry systems now account for the major portion of thermochemical research. A number of simple modifications to one such calorimeter have been found to maintain the accuracy and precision of the data obtained while achieving increased efficiency and reduced cost.     

Uses of Raman Spectroscopy in Cement Chemistry

Laser-Raman spectroscopy is largely complementary to ir spectroscopy, but spectral interpretation is simpler. Lack of homogeneity in clinker minerals, direct study of white portland cement hydration, characterization of clinker minerals, identification of the various calcium sulfate forms, and effects of carbonation are discussed.     

Public perception of biotechnology hazards

So far the public reaction to new biotechnology industries has been largely benign, at least in the UK, but it is questionable how deeply held and how stable this attitude is. Biotechnology has some features in common with classic risk related issues, like nuclear power and pesticides, and could provoke an equally adverse public response. This paper examines what we currently know about perceptions of biotechnology with the conclusion that the ‘public’ has yet to make up its mind. Factors that could influence the future public response include: rural social disruption caused by further increases in the productivity of agricultural land; any failure to control the new technology effectively, leading to a loss of public trust in the regulatory system; and intrinsic moral and ethical issues surrounding genetic manipulation, particularly in higher animals.     

化工项目中用电负荷表的应用

文章根据实例简述了化工项目中用电负荷表的应用。通过用电负荷表来统计中压电机、中压馈电、低压电机、低压馈电的数量,额定功率之和、有功功率之和、无功功率之和。以选择合适的变压器以及无功补偿容量。     

钼酸盐在表面处理工业中的应用

列出９个配方说明钼酸盐在磷化、金属缓蚀、化学镀镍、电镀金、电镀锌和镀锌钝化中的应用。     

The biotechnology of oilseed crops

A general summary of possibilities and limitations application of biotechnology processes to processing and/or production of fats and oils is presented. Enzymatic processes, cloning of premium perennial oil crops and genetic manipulation of oilseed compositions are discussed.