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动物对环境温度的适应,会使自身的细胞内转录和表达模式发成变化,以适合环境的变化,此时它会出现新的基因开放和新蛋白因子的合成,这总的来说是动物对自身的一种保护方式。本文从基因水平、蛋白质水平、细胞膜水平等三个方面综述了动物对环境温度适应的研究概况,并讨论了动物对环境温度适应的分子生物学机制以及在进化中的意义。 相似文献
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关于我国国库集中支付制度改革的思考 总被引:4,自引:0,他引:4
张继珍 《中央财经大学学报》2001,(7):38-41
当前我国财政改革的重点是支出管理改革,而国库集中支付制度是支出管理改革的内容之一,该文首先分析了当前国国库管理体制存在的主要问题和建立国库集中支付制度的必要性,在此基础上提出了建立这一制度的指导,了后提出了关于建立我国国库集中支付制度的一些具体设想。 相似文献
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TGF—β(transforming growth factor—β,TGF—β)是一类在结构上相对保守的生长因子,是细胞增殖、分化、细胞外基质合成和细胞凋亡的主要调节因子之一。近年来也发现,该家族成员的部分因子如TGF—β、骨形态形成蛋白(bone morphogeneticp rotein,BMP)/生长分化因子(growth and differentiation factor,GDF)、激活素/抑制素(Activin/Inhibin)也参与胚胎着床过程,且这些生长因子的表达表现出时空特异性。 相似文献
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Large-scale participatory co-shaping of technological developments: First experiments with PARDIZIPP
A future-oriented participatory procedure on the basis of the Delphi method was developed and empirically tested a first time with the goal to improve the shaping of technological developments. The technology under study here was micro-electronics or rather their relationship with labor and the test took place in NorthRhine-Westphalia.Today problems exist in all walks of life. There is a lot of talk about today's problems as if they were new, though one has heard similar arguments throughout history. How do we assess if we are really in danger of bringing the world to an end? Although this danger appears real, it would not be the first time in history that people have thought and felt like this--However, one thing that is new are the consequences of modern sciences and technology, which are not suited to given social and environmental requirements. They have given rise to questions concerning the quality of the decision-makers. The questioning of many of these decisions has increased for some time and is now getting more and more specific, with a demand for quality and information rather than managerial skills and competitiveness from the decision-makers. The term ‘decision-maker’ describes those who determine the application of technology, science and technical equipment which has either existed for a long time already or has recently been developed.--It is not easy to change the structures and processes of decision-making so that new structures and processes will be more suited to social and environmental requirements. We have tested our ideas as to how this could be done, in an empirical project. Although we called it ‘Project NRW-2000’, it would probably be better described as an experiment.--We persuaded 90 ordinary people to participate in this project as ‘experts on daily life and work’. This group was asked to work in six regional sub-groups and discuss, with reference to three given normative societal scenarios for the year 2020, the relationship between microelectronics and labour markets of the year 2020, on the basis of a participatory Delphi procedure. Before we elaborate on the concept of our project in Section 3, we would like to outline it in terms of the mainstream of the sociology of technology as well as with research on ‘acceptance’ in Section 1. In Section 2 we will briefly illustrate the framework of the research programme ‘Socially Oriented Shaping of Technology’ of the state of Northrhine-Westphalia, which funded our research project. Section 4 particularly deals with the participatory elements of our project, while Section 5 is devoted to the development of the scenarios. Section 6 sums up the results of the ‘scenario-construction’. Regarding specific elements, we restrict ourselves to topics concerning technology, labour, and the relationship between women workers/employees and technology. As a final outlook we deal with the political implications of our approach. All that is left is to remind our readers that we regard this project as a first application or experiment within our overall approach. 相似文献
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介绍了蛋白质和改性蛋白质溶胶的流变特性,指出蛋白质溶胶的流变特性主要为非牛顿流体的假塑性流体,且其流变特性受诸多因素的影响;蛋白质经过改性后,流动性有较大的改善。最后概述了蛋白质溶胶流变特性方面的应用。 相似文献
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蛋白质是组成人体结构成分和酶等特殊的功能性物质,并在生命过程中发挥着关键性作用。它是人体的主要成份之一,也是人体内部进行各种代谢活动的物质基础。蛋白质在机体内的存在形式和作用是多样化的,与运动个体的肌肉力量和肌肉蛋白合成紧密相关。在运动过程中,骨骼肌收缩活动会影响蛋白质和氨基酸代谢,这种运动的影响还延续到运动后。 相似文献
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大豆蛋白是大豆的主要农产品之一,主要在材料粘合剂、生物降解膜和塑料材料、纤维材料和生物医用材料等几个领域研究较多。随着目前全球性环境问题和石油资源的日益紧张,天然高分子材料的开发成为21世纪科学工作者研究的热点课题。文章就大豆蛋白在非食品方面的应用展开叙述,总结了大豆蛋白在胶粘剂、大豆蛋白膜、大豆蛋白塑料、大豆蛋白纤维和生物医用材料方面的应用。 相似文献
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目前测定蛋白质的方法和仪器很多,为了提高蛋白质含量检测结果的准确性和检测效率,依据GB/T 5511-2008《谷物和豆类氮含量测定和粗蛋白质含量计算凯氏法》要求,常用定氮仪来测定粮食中粗蛋白质含量。对此方法中化学试剂硫酸的选择及实际操作进行了探讨。 相似文献