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121.
在溴化十六烷基三甲基铵存在下碘化钾——结晶紫体系浮选分离镉的研究 总被引:2,自引:0,他引:2
研究了在溴化十六烷基三甲基铵存在下碘化钾—结晶紫体系浮选分离镉的行为及其与常见离子分离的条件。试验表明,在一定条件下,能使Cd(Ⅱ)与常见离子Zn(Ⅱ)、Fe(Ⅲ)、Co(Ⅱ)、Ni(Ⅱ)、Mn(Ⅱ)、Al(Ⅲ)分离。 相似文献
122.
本文尝试根据美国《时代》周刊所属的时代公司前后六任总编辑的理念和作为,来分析《时代》83年来的发展变迁历程,将这个常盛不衰的历程划分为大致均等的两个时期,即前40年的卢斯时期和后40年的后卢斯时期,其间经历了广播、电视、互联网等媒体的兴起和冲击,以及新闻媒体公司化、集团化的影响。作者发现,《时代》在开创和引领全球新闻杂志新时代的同时,对传统新闻价值观既有继承,也有一定程度的颠覆,数十年后又有某种复归。 相似文献
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124.
V. M. Baikar M. V. Kamath C. Vishwanathan A. M. Varadkar S. E. Bharmal 《Indian journal of clinical biochemistry : IJCB》2003,18(1):80-86
TMAE-Fractogel 650 (M) (Trimethylaminoethyl) is an ion exchange medium can be used to capture factor VIII (F VIII) directly
from plasma. Previous reports have focused on the use of DEAE-Fractogel 650 (M) (Dimethylaminoethyl) ion exchange medium to
capture F VIII from cryoprecipitate and plasma. Our main objectives were (I) to standardise the purification of FVIII from
human plasma by column chromatographic technique. (II) to study the recovery of FVIII activity in purified fraction at 18–20°C
process condition. (III) to study the effect of virucidal step on recovery of FVIII activity and (IV) to study the effect
of lyophilisation on FVIII activity. In this report, Citrate Phosphate Dextrose (CPD) plasma was batch stirred with dry DEAE-Sephadex
A50, filtered, diluted, loaded on to a column packed with TMAE-Fractogel and chromatographed. Most of the unwanted proteins
flowed through the gel unadsorbed. Bound F VIII was eluted by increasing the ionic strength of the buffer. This purification
step gave an overall 80% recovery from the plasma with a specific activity of 0.97 IU FVIII/mg protein. The purified F VIII
fraction was made virus safe by employing the virucidal technique developed by New York Blood Centre (NYBC). There was 48.43%
loss of FVIII activity in Virus inactivation treatment and the loss of FVIII activity in lyophilisation was 8.45% which is
acceptable. This method of purification gave a higher yield of FVIII than cryoprecipitation, and is a promising alternative
method to cryoprecipitation of F VIII. 相似文献
125.
利用哈密顿体系以及辛几何中的分离变量和本征函数展开的方法,给出了求解对边固支另两边简支的矩形薄板弯曲问题的方法,并通过实例计算和分析说明了该方法的正确性. 相似文献
126.
中国现代大学学术体制的演变,可分为1949年以前的民国时期和新中国成立以后的时期。前一时期的大学体制以学术独立、政学分离为基本诉求,而后一时期的大学体制以计划学术、政学统一为基本特点。从组织形态上讲,当今中国大学以"政学统一"的学术建制和"官本位"的管理体制为其核心特质。促进高校学术创新和学术发展,最关键的是要建设一种良好的学术生态环境。为此,必须跳出计划体制管理模式,按照大学的逻辑办大学,加强学术同行评议,建立现代大学制度,进一步完善学术生态系统。 相似文献