Miniaturized Cell Lysis Device Using Spherically Focused Ultrasound

A prototype of a miniaturized cell lysis device developed using a concave spherical transducer is capable of lysing bacteria without added chemical denaturants, enzymes or microparticles and is capable ofefficiently lysing yeast without any mechanical or enzymatic pretreatment. The device is designed for miniature bio-analysis systems where cell lysing is needed to obtain intracellular materials for further analysis such as DNA identification. The device lysis efficiency was evaluated using viable cell counts and microscopy.Additionally, the device efficiency was compared with that of traditional chemical cell lysis methods using standard molecular biological techniques such as agarose gels and ultraviolet (UV) spectroscopy. The results indicate that efficient bacteria and cell disruption can be achieved through a low-voltage-driven and spherically focused high-frequency ultrasonic device.     

Preparation and Performance of Bipolar Membranes with Liquid Ion-Exchange Medium

The current density is rather low in solid bipolar membranes, because the water transfer rate is relatively slow across solid bipolar membranes made of solid ion-exchange materials. This paper describes the use of polymer solutions, such as phosphatic poly(vinyl alcohol) solution, poly(acrylic acid) solution and poly(vinyl alcohol) solutions with dispersed cation/anion-exchange resin particles to prepare bipolar membranes. The 0. 1 mol/L NaOH and the 0.05 mol/L H2SO4 were used to test the performance of the bipolar membranes. For a fixed liquid layer thickness, both the current density and the selectivity increase with the concentration increase of a polyelectrolyte solution. The maximum current density measured in the experiment was 1497A/m^2 with a selectivity of 96.8%.     

原位合成铝基复合材料的研究现状

简介了目前反应合成铝基原位复合材料的常见复合工艺：固-液、气-液和固-固反应等。指出它们的优点是反应合成的强化相尺寸细小，与基体结合强度高，缺点是强化相种类较少，反应过程难以精确控制。其次，概述了原位铝基复合材料的常见陶瓷强化相和金属问化合物强化相良好的力学性能、耐磨性和高温性能，以及反应合成时与基体亲和力大的特点。指出反应合成的铝基复合材料的有常温力学性能高、高温性能好和耐磨性突出的优点，而存在的主要研究难题则是整个材料均质化方法不理想、生长机制等基础理论研究缺乏、反应伴生的化合物难以控制等。作者还讨论了铝基原位复合材料在民用领域的潜在应用前景。     

脂质体的制备方法及研究进展

脂质体是磷脂自聚集而形成的双分子层结构 ,作为药物载体具有减少药物毒副作用及靶向作用的特点 .主要介绍 :脂质体 3种制备方法物理分散法、两相分散法和表面活性剂增溶法的原理 ,制备出的脂质体的结构及包封性能和各自的优缺点 ;脂质体作为药物载体在抗癌、抗菌药物上的应用及其在药物载体方面应用的研究进展 .     

黑脉羊肚菌培养条件选择及原生质体的制备

探讨了黑脉羊肚菌的培养条件和原生质体的制备.结果表明,洋葱液体培养基适合黑脉羊肚菌生长.培养3d的黑脉羊肚菌菌丝体在30℃下,用4%溶壁酶酶解2 5h,原生质体数目为2 53×106个/mL.     

纳米化学发展现状

介绍了纳米结构物质的性质和应用以及制备方法,指出纳米化学的发展对纳米材料的开发和应用的作用.     

用于高级氧化水处理的空气电极的工作原理及制备

对目前正在研制中的一种利用空气中的氧气为原料,能高效合成廉价的 H_2O_2用于水污染处理的电化学电极的工作原理、电极制备进行介绍。     

二氧化硅超细粉末的制备

以不同的原料采用溶胶-凝胶法制备了不同粒径的超细SiO2粉末，通过TEM，TG-DTA和IR方法对产物进行了表征。     

萃取精馏法制备纳米钛白的研究

以硫酸法钛白生产过程的中间产品TiOSO4液为原料，采用萃取等方法将TiO2转为有机物溶胶，再将此溶胶蒸馏制成纳米TiO2粉体。以D2EHPA为萃取剂，最佳萃取工艺条件为：D2EHPA浓度25％，O／A＝1：5，萃取时间10min。最终产品纳米TiO2通过煅烧温度达到物相的晶形转变，其纳米TiO2膏体粒子粒径为20nm。     

纳米金属氧化物粉体的制备方法及其应用

综述纳米金属氧化物及复合金属化物粉体的各种制备方法及其在化工、陶瓷、生物医学、磁性材料等领域中的应用。