Membrane resting potentials in cultured mouse neuroblastoma cells

Summary Membrane resting potentials (MRP) were measured systematically in cultured mouse N₂A neuroblastoma cells: 1) in the logarithmic growth phase; 2) in subconfluent cultures; 3) in confluent cultures; 4) after dBcAMP had induced morphological differentiation. Neurite extension was accompanied by a significant increase in MRP as compared to the appropriate controls. No significant differences in MRP were observed with regard to the different growth phases.     

Identification of hemolytic granules isolated from human myocardial cells

Summary Human myocardial cells from fresh autopsy material contained granules which possessed hemolytic activity against guinea pig and rabbit erythrocytes. The hemolytic granules, which had a density of 1.02 and a diameter of 200–300 nm, were recovered as a microsome fraction from subcellular homogenates of human myocardial cells by differential centrifugation in 300 mM sucrose containing 0.1 mM PMSF and 10 mM EDTA. The membrane lesions caused by the granules were ring-like structures with an internal diameter of about 10–17 nm, analogous to that caused by perforin- and complement-induced lysis. However, the requirement for divalent cation differed from that for perforin-induced lysis, since the microsome-mediated lysis occurred in the presence of EDTA.     

香精微胶囊的制备及其性能研究

以香精为芯料,以明胶-阿拉伯胶为囊材,通过复凝聚法制备出一系列不同工艺条件下的微胶囊,分别测得微胶囊的内径、外径和膜厚,从而揭示出微胶囊制囊工艺对微胶囊性能的影响规律。     

渗硫处理对常温固化粘结润滑膜耐磨性影响的研究

本文作者通过对45#钢底材渗硫处理对常温固化粘结润滑膜耐磨性影响的研究,发现了经低温熔融硫浴法处理后,再喷涂常温固化干膜,可以使干膜的耐磨寿命延长0.6倍,并用多种测试分析手段详细考察了渗硫层的成分、组织,并就渗硫处理对润滑膜寿命的影响进行了解释。     

Non-host-selective fungal phytotoxins: Biochemical aspects of their mode of action

During the last decade increasing attention has been directed towards the biochemical mechanisms responsible for the biological activity of phytotoxins. Studies on the mode of action of some non-host-selective phytotoxins, some following on from previous observations, have demonstrated a very specific interaction with particular components of the cell machinery, and have suggested the possible use of these phytotoxins as tools for the investigation of important biochemical processes. This review article reports and discusses results of studies carried out in the 1980s with seven non-host-selective fungal toxins: brefeldin A, cercosporin,Cercospora beticola toxin, fusicoccin, ophiobolins, tentoxin, and zinniol. Each of these interferes with the life of the host by interacting with a different biochemical target.     

圆柱与圆锥偏斜交相贯线求法的研究

在化工设备制造中 ,首先要准确地放样下料 ,而放样下料的关键是精确地求出相贯线和素线的实长。圆柱与圆锥偏斜交相贯时 ,传统的相贯线求法是过圆柱表面上一条素线与圆锥锥顶作一辅助平面 (一般位置平面 ) ,求出该辅助平面与圆锥面的交线 ,其交线与圆柱面上素线的交点即为相贯线上的点。在分析了传统方法的特点及不足的基础上 ,提出了一种新的求解方法 ,避免了传统方法的不足。     

CVD法制备质子交换膜燃料电池用炭纤维纸

采用干法成型技术制备聚丙烯腈（PAN）基炭纤维纸坯体,用化学气相沉积（CVD）法将其制备成炭纸,并在2000℃进行石墨化处理。利用扫描电子显微镜（SEM）和偏光显微分析（PLM）观察炭纸及坯体的显微结构,利用X射线衍射仪测试炭纸的石墨化度,并利用四探针法测试炭纸的导电性能。研究结果表明：采用干法成型技术制备的炭纸坯体是由炭纤维随机堆积构成的网络结构,孔隙分布较均匀;采用CVD工艺所制备的热解炭具有粗糙层结构特征;炭纸中纤维由热解炭紧密连接;炭纸的平均石墨化度高达82．2％,大于日本Toray炭纸和加拿大Ballard炭纸的石墨化度。CVD法沉积的热解炭改善了炭纸的导电性能,其体电阻率为3313mΩ·cm,低于Toray炭纸和Ballard炭纸的体电阻率（分别为45.2和135．9mΩ·cm）其面电阻率为6．0mΩ·cm,低于Toray炭纸和Ballard炭纸的面电阻率（分别为6．4和16．3m．Ω·cm）。     

Mn2+在Ti/SnO2+SbOx/PbO2电极上的电氧化研究

比较了Ｔｉ／ＳｎＯ２＋Ｓｂｘ／ＰｂＯ２电极与Ｔｉ／ＰｂＯ２电极在电解Ｍｎ＾２＋体系中的析氧极化曲线、Ｍｎ＾２＋的氧化极化曲线和电极寿命,发现加入中间层后的Ｔｉ／ＳｉＯ２＋ＳｂＯｘ／ＰｂＯ２电极对Ｍｎ＾２＋的电氧化有更好的催化活性和较长的使用寿命。用正交实验法探讨影响Ｍｎ＾２＋→Ｍｅ＾３＋＋ｅ电极过程的因素,找出以Ｔｉ／ＳｂＯｘ／ＰｂＯ２电极为阳极用无隔膜电解槽电解Ｍｎ＾２＋的最佳工艺条件,在此条件     

等衰落轨道角动量索引调制系统的信道容量性能分析

射频轨道角动量(orbital angular momentum,OAM)提供了一种可以在同一载波频率物理信道上复用一组正交模式以提高信道容量的方法。现有研究大多专注于信道容量提升,对系统复杂度的研究相对较少。在基于均匀圆形阵列(uniform circular array,UCA)的OAM通信系统中,发射机需要完成大量调制运算以生成OAM信号。于是,提出了一种等衰落轨道角动量索引调制(equal fading orbital angular momentum index modulation,EOAM-IM)方案,其中,IM有效降低了OAM调制运算复杂度,且等衰落发射机也保证了不同模式OAM子信道传输增益。此外,还详细推导了所提EOAM-IM方案的系统信道容量。仿真结果表明,所提EOAM-IM方案能以更低的调制复杂度获得比传统OAM方案更高的信道容量。