论豫南信阳群龟山组糜棱岩带母岩的递进变质作用

以弱变形的变质岩和糜棱岩中呈构造残斑形式存在的特征变质矿物及其矿物组合为基础,在研究区划分出十字石-蓝晶石带和矽线石带。从而揭示出研究区在糜棱岩化以前曾经历过角闪岩相的变质作用历史。利用各种方法估算出角闪岩相变质作用的温压条件为:500～640℃,0.3～0.5GPa。     

介质损耗测试方法的研究

以傅立吸叶级数分离基波相位的方法为依据，采用先进的单片计算机技术，提出了一种新的测量方法，理论分析和仿真结果表明，这种数字测量方法检测方便，系统组成简单，智能化程度高，适用于介质损耗角正切较大的简易测量，最后给出了用ＭＣＳ０８０９８单片机组成的数字测量系统的硬件结构图。     

硫酸介质中铅阳极膜阴极还原过程的研究

采用光电化学技术和实时交流阻抗测量等现场方法研究铅阳极膜的阴极还原过程，发现ＰｂＯ电位区阳极氧化形成的阳极膜在阴极还原时有两种ＰｂＯ的还原，即ｏ－ＰｂＯ和ｔ－ＰｂＯ二种氧化物的还原，还原过程中的电极阻抗变化情况表明ＰｂＯ层是均匀还原的，且是ｔ－ＰｂＯ先还原，ｏ－ＰｂＯ后还原．还分析了铅阳极膜在阴极还原过程中所表现出来的阴极光响应．     

VHS录像机HQ技术的探讨

本文阐述VHS录像机HQ技术的主要内容以及如何运用HQ技术改善重放画面的质量。     

无限冷硬球铁轧辊去应力退火温度的确定

通过比较无限冷硬球铁轧辊经过不同温度退火处理后组织和硬度的变化,测定了该材料在凝固和冷却过程中的铸造应力,在此基础上提出了无限冷硬球铁轧辊去应力退火处理的度为４００℃左右。     

经济植物茶条槭叶部没食子酸含量与树龄的关系

根据对不同树龄的茶条械叶部没食子酸含量的测定结果,分析茶条械叶部没食子酸含量与其树龄的关系,为茶篥械经济林的树控制提供可靠参数。     

Analysis of nuclear apoptotic process in a cell-free system

We report an analysis of the apoptotic process of mouse liver nuclei induced in a cell-free carrot cytosol system by cytochrome c. Typical characteristics of apoptosis were observed, such as chromatin condensation, margination, apoptotic bodies and DNA ladders. Furthermore, transmission and scanning electron microscope analysis of the apoptotic nuclei detected chromatin-free nuclear vesicles before apoptotic bodies appeared at a comparatively late phase. When AC-YVAD-CHO, an inhibitor of caspase 6, was introduced into the system, these vesicles and apoptotic bodies disappeared completely within our study sections. We confirmed the results using whole-mount electron microscopy, and found that although the nuclear lamina was destroyed early, the nuclear matrix largely remained intact during the course of apoptosis. The nuclear matrix played an important role in maintaining the integrity of apoptotic cells and connecting the apoptotic bodies and apoptotic nucleus. Received 29 September 2000; revised 10 December 2000; accepted 13 December 2000     

Role of FGF-2／FGFR signaling pathway in cancer and its signification in breast cancer

Fibroblast growth factor-2 (FGF-2) is a member of a large family of proteins that bind heparin and heparan sulfate and modulate the function of a wide range of cell types. It has been proved that FGF-2 stimulates the growth and development of new blood vessels (angiogenesis) that contribute to the pathogenesis of several diseases (i.e. cancer, atherosclerosis). However, many of the biological activities of FGF-2 have been found to depend on its receptor抯 intrinsic tyrosine kinase activity and second messengers such as the mitogen activated protein kinases. This review will focus on the mechanism of FGF-2/FGFR induced signaling pathway in tumor and human breast cancer.     

Thermodynamic characterization of two novel spin-crossover complexes

Spin-crossover complexes are of great interest to the scientists because of their potential application in molecular-based electronic devices. Some octahedral metal compounds with 3dn (4 ≤ n ≤ 7) configuration can induce a spin state conversion through a fine tuning condition (temperature, pressure, light irradiation, etc.). If the conversion occurs reversibly with a hystersis loop and color change, it will make the system possessing memory effect. The memory effect can be magnified and the …     

循环流化床锅炉内掺高硫石油焦混烧脱硫灰的矿物相组成

粉煤灰的矿物相组成对其资源化具有重要意义,它主要取决于燃料品种和燃烧过程.由于燃烧过程的差异,循环流化床锅炉(CFBC)内掺加高硫石油焦和煤混烧而排放的脱硫灰与煤粉炉粉煤灰在矿物相组成上具有较大差异.利用扫描电镜(SEM)、X-ray衍射(XRD)和傅立叶转换红外光谱(FT-IR)对CFBC掺高硫石油焦混烧脱硫灰的矿物相组成进行了研究,同时采用选择性溶解分离和重力分离的方法富集脱硫灰中的微量矿物,研究表明CFBC掺高硫石油焦混烧脱硫灰的矿物相组成以高α-石英、硬石膏和石灰含量为其主要特征,同时含有少量的方解石、莫来石、钙长石、钙铝黄长石、赤铁矿、硅酸二钙(2CaO·SiO2,C2S)、铝酸三钙(3CaO·Al2O3,C3A)、七铝酸十二钙(12CaO·7Al2O3,C12A7)及透辉石等矿物,可能含有少量玻璃相.如果样品在空气中存放时间较长,石灰吸收空气中的水分会导致羟钙石生成.而煤粉炉粉煤灰中的矿物主要为莫来石、石英和少量的赤铁矿,并含有大量的玻璃相.