去污剂／聚合物双水相体系在膜蛋白分离中的应用

去污剂／聚合物双水相体系主要依靠胶束和聚合物分子间作用力来实现成相,具有对疏水膜蛋白增溶作用、成相物浓度低、萃取环境温和及操作简单等特点,可以克服传统膜蛋白提取工艺的一些缺陷;工艺开发过程中疏水膜蛋白以疏水作用富集于去污剂相,亲水蛋白以体积排阻效应富集于聚合物相,从而实现对膜蛋白的分离纯化。     

城市污水处理的新技术及其发展动向

在参阅大量国内外文献资料的基础上,介绍了城市污水处理的膜生物反应嚣、光催化技术和超临界水氧化技术。对这3种新技术的基本原理、研究进展及今后的发展动向作了详细阐述。     

Analysis of Circumstance Influence Factors on HMBR for Waste-water Reclamation in Dwelling District

Circumstance influence factors on Hybrid Membrane Bio-Reactor (HMBR) process for the wastewater reclamation in dwelling district was analyzed. The main characteristic of this process is that sludge and nitrified effluent can be recycled automatically, which simplifies the operation of system and is beneficial to get the high removal of organics and nitrogen. Based on the analysis of circumstance influence factors, it is recommended that water temperature of about 20℃, influent pH of 6 -7 and DO of 1. 0 mg/L - 1. 5 mg/L in the aerobic compartment. Under these conditions, COD, BOD5, NH4+ -N, and TN were removed effectively in HMBR and the average removal efficiencies were 94.5%, 99.3%, 99.4% and 84.7%, respectively. SS and coliforms were both below the detection limits in the permeate of UF membrane module, and turbidity was less than 1NTU. The treated effluent meets the Miscellaneous Domestic Water Quality Standard (CJ25.1-89), and can be reused multipurposely such as watering of green belts, cleaning a     

Maximally parallel attribute on P System: Properties and applications

In this paper, we investigate the maximally parallel attribute of P Systems. Some properties of P Systems are introduced, which are the filter property and the enumeration property. The two roperties are applied to solving the sorting problem and the Hamilton cycle problem, respectively.     

Detection and analysis of DNA recapture through a solid-state nanopore

Motion control of a single molecule through a solid-state nanopore offers a new perspective on detecting and analyzing single biomolecules. Repeat recapture of a single DNA molecule reveals the dynamics in DNA translocation through a nanopore and may significantly increase the signal-to-noise ratio for DNA base distin- guishing. However, the transient current at the moment of voltage reversal prevents the observation of instantly recaptured molecules and invalidates the continuous DNA ping-pong control. We performed and analyzed the DNA translocation and recapture experiment in a silicon nitride solid-state nanopore. Numerical calculation of molecular motion clearly shows the recapture dynamics with different delay times. The prohibited time when the data acquisition system is saturated by the transient current is derived by equivalent circuit analysis and finite element simulation. The COMSOL simulation reveals that the membrane capacitance plays an important role in determining the electric field distribution during the charging process. As a result of the transient charging process, a non-constant driving force pulls the DNA back to nanopores faster than theoretically predicted. The observed long time constant in the transient current trace is explained by the dielectric absorption of the membrane capacitor.     

Trajectory P system

Membrane computing is a branch of natural computing aiming to abstract computing ideas for the structure and the functioning of living cells as well as from the way the cells are organized in tissues or higher-order structures. Trajectories are used as a tool for modeling language operations and other related objects. A trajectory P system consists of a membrane structure in which the object in each membrane is a collection of words and the evolutionary rules are given in terms of trajectories. In this paper, we present some properties of trajectory P systems.     

猪肺炎霉形体膜毒性的研究

用本室制备的猪肺炎霉形体菌体细胞和膜制剂分别接种兔肾原代单层细胞，对其膜毒性进行研究。结果表明：猪肺炎霉形体膜制剂对单细胞有明显的致细胞病变作用。一般在接种后１～３天出现明显的细胞病变，随接种剂量的不同，单细胞病变出现的时间和程度均不相同，说明细胞膜中存在有致病因子     

关于膜分离过程中的浓差极化问题

本文论述了浓差极化的理论计算方法,并利用带激光器的两光束干涉测试技术,测定了膜表面处边界层中溶质的浓度分布断面和浓差极化值,文中还论述了消除浓差极化的一些有效措施。     

细胞膜电场分布的一种模式

细胞膜电场分布是决定细胞膜通道开或关的重要参数。多年来对细胞膜的电场分布一直采用简化模式进行计算。本文提出一种更为真实性的模式,进行计算并导出细胞膜两边电场分布的积分解。在此基础上,对细胞膜两边的荷电分子或离子浓度所产生的电荷分布类型进行讨论。计算结果表明,电场分布依赖于膜的结构、离子浓度及温度。对简单的情况,可导出通道类似于一个电阻,通道内的电场分布可用一电路模拟。通道周围的电场可用一电偶极矩等效。     

“疏松型”反渗透膜分离活性染料溶液的初步研究

用相转化法制备醋酸纤维素“疏松型”反渗透膜，初步测定了膜对活性染料溶液的分离性能．