Heterogeneity of poly(I) x poly(C)-induced human fibroblast interferon mRNA species

Three classes of human interferons (IFNs) have been defined on the basis of their immunological properties: the 'Le' or 'alpha' IFN, mainly derived from leukocyte or lymphoblastoid cells; the 'F' or 'beta' IFN, mainly derived from fibroblast cultures; and the 'T', 'immune' or 'gamma' IFN, mainly derived from mitogen- or antigen-stimulated lymphoid cells. Whereas several individual species of Le IFN have been purified to homogeneity, it is generally considered that F IFN represents a single protein. Thus current efforts to clone human fibroblast IFN mRNA sequences are based on the observation that F IFN mRNA sediments in sucrose gradients as a single RNA species of size corresponding to 12-14 S (refs 7-10). We show here, using gel electrohporesis of mRNA, that two populations of translationally active human fibroblast IFN mRNA molecules exist--an abundant '14 S' species and a scarce '11 S' species. Microinjection of either species of mRNA into Xenopus oocytes leads to the synthesis of biologically active F-type human IFN. These data agree with and complement recent RNA hybridization studies of Weissenbach et al.     

有机气体麻醉活性的构效关系研究

应用量子化学HF/6 31G**从头算法得到了18种有机气体的优势构象,在此基础上结合分子图形学技术,获得相应优化构象的电子结构参数和几何结构参数,并将这些参数与有机气体的麻醉活性参数相关联. 结果表明:有机气体的麻醉活性与分子范德华体积、辛醇／水分配系数和分子最高占用轨道能的相关性较好,成功地建立了18种有机气体的构效关系式.     

企业与市场关系的重新审视

对企业与市场的关系进行了重新审视。从企业契约形成、契约履行及企业管理两个阶段探讨了企业与市场的内在联系和区别,认为企业与市场的本质差异在于企业是一种创造财富的有效机制。     

内燃机缸筒-活塞环的润滑与密封分析

推导出内燃机的缸筒与活塞环之间润滑油膜厚度和活塞环气体密封的分析模型,给出了实用的数学公式．并且对具体的发动机进行了计算．     

Dyeing PET Textile with C.I. Disperse Red 60 and C.I. Disperse Orange 25 in Supercritical CO2

For a better understanding of the feasibility of supercritieal fluid dyeing （SFD） and more available information for the process development, the experiments of dyeing PET textile with C.I. disperse red 60 （anthraquinone type） and C. I. disperse orange 25 （azo type） in supercritieal CO2 were carried out with a high-pressure dyeing apparatus at temperatures from 80 to 130℃ and pressure up to 31 MPa. The effect of operating conditions on color yield （K/S） was investigated in SFD experiment, and the optimum operating conditions for the above two disperse dyes were obtained as follows： the temperature 120℃, the pressure 25 MPa and the dyeing time 100 min. As compared with SFD, the conventional water dyeing （CWD） was carried out with the same dyes and textile. The results show that the better fastness, levelness and apparent color can be achieved in SFD and the SFD process has many significant advantages over the CWD process.     

脱绒棉种介电常数与含水率的关系

脱绒棉种含水率是影响棉种的介电常数的关键因素,为给脱绒棉种介电分选关键参数的后期研究提供依据,利用介电常数的测量装置以及MA45C-000230V1水份测量仪等装置对脱绒棉种介电常数与含水率等因素进行了试验,运用SPSS软件对脱绒棉种介电常数进行了方差分析和残差分析,并分析了脱绒棉种介电常数与棉种含水率二者之间的关系,以及脱绒棉种介电常数的区间估计和预测。结果表明:脱绒棉种介电常数与棉种含水率之间最优回归方程为^Y=10.606+90.943X,统计数据点与回归方程线拟合良好;棉种含水率为0.07时介电常数的估计区间为[15.80878,18.13587],预测值为16.9723。     

Jaulent-Miodek方程族与Burgers方程族之间的关系

给出了Burgers方程族的解到Jaulent-Miodek方程族的解之间的变换,从而通过众多的Burgers方程族的解得到Jaulent-Miodek方程族的一些特解.     

On the Relationships between the Cohesive Devices and Their Meanings

Cohesion is one of the phenomena of the text.It is expressed through the cohesive devices.As part of Functional Grammar,the cohesive devices relate themselves naturally to the meanings,which exist both in the text and in its social context.This paper is to explore the relationship between the cohesive devices and their meanings.These meanings subsume the discourse semantics in the text and the register in the social context.     

有机氯化物的定量结构-活性关系研究

应用分子力学方法MM~+和半经验量子化学AM1法得到了14种有机氯化物的优势构象,利用量子化学算法和分子图形学技术获得电子结构、几何结构和拓扑结构参数,并将这些参数与有机氯化物对细胞核的损害能力相关联。结果表明：有机氯化物对细胞核的损害能力与分子的水化能、分子质量和氯原子的净电荷的相关性较好,成功地建立了14种有机氯化物的构效关系式。     

TMS320C6711与I2C总线接口的实现

简单介绍了I2C总线,讨论了在TMS320C6711上扩展I2C总线的方案,并比较采用多通道缓冲串口(McBSP)和采用可编程逻辑器件这两种实现I2C总线接口协议的方法.从硬件连接和软件编程的方便性考虑,利用多通道缓冲串口(McBSP),用软件编程来模拟I2C总线协议,从而实现I2C总线接口的方法更简单,硬件设计更容易.并以TMS320C6711初始化视频解码芯片(SAA7111)为例,给出了相应的硬件电路以及模拟I2C总线协议的软件实现.     

HMX的晶体缺陷和酸值的关系

该文研究了奥克托今(HMX)的晶体缺陷和酸值(以醋酸计)之间的关系。在实验分析和显微照像基础上,提出在HMX晶体内形成母液包裹体的一种机制,即在晶体生长过程中出现了巨阶梯,进而形成包裹体,当HMX从强酸溶液中迅速成长时该包裹体由硝酸或汽泡充满。     

严格收敛性与其他收敛性之间的关系

讨论了Hilbert C* -模上的有界线性算子网的严格收敛性与范数收敛性、强收敛性、弱收敛性之间的关系,证明了:严格收敛的算子网{Tλ}λ∈Λ的伴随算子网{Tλ*}λ∈Λ也是严格收敛的;严格收敛性是保持加法和数乘运算的;两个严格收敛算子网之积仍是严格收敛的;严格收敛的算子网一定是强收敛的.     

裴迪与王维交游考

裴迪因与王维赋诗唱和而名世,过去论者研究王维者多,研究裴迪者少,在他们二人交游问题上．难免以偏概全。裴迪为裴天恩之弟裴天寿之后裔,大约生于开元六年（718）。他与王维交游始于唐天宝二年（743）正月,交谊深厚,亲密无间。乾元元年（758）初,即裴迪与王缙入蜀之前,二人交游始止。其后裴迪便无踪迹,难以查考。     

概念格约简与覆盖约简之间的关系

以一类与覆盖粗糙集相对应的形式背景为工具,对概念格属性约简和覆盖粗糙集约简进行研究,结果表明覆盖粗糙集与形式背景之间存在一一对应关系,并且证明了覆盖粗糙集的交约简可化为概念格的属性约简。     

AB与BA正则性谱之间的关系

主要研究Banach空间X上AB和BA的正则性谱之间的关系,证明了σRi(AB)＼{0}=σRi(BA)＼{0}(其中i=1,…,15),并在A,B是单射的条件下得到了σR3(AB)=σR3(BA).     

Relationships between controllers of a system

Many different arrangements of controllers can be designed to ensure the efficient functioning of a system. Whether the system is a complex piece of machinery or a committee in session, the principles are the same.