双苯甲酰丙酮缩乙二胺合镍(II)配合物的合成和晶体结构

合成了双苯甲酰丙酮缩乙二胺Schiff碱镍(II)配合物,并测定了该分子晶体结构。晶体属单斜晶系,空间群为P21/n,晶胞参数:a=10.793(2),b=7.909(2),c=22.025(4)A°,β=96.68(3)°,V=1867.4(7)A°3,Z=4,Dc=1.441g·cm-3。对于3494(I2σ(I))个可观察点,最终偏差因子R=0.0281,WR=0.0768。Schiff碱配体的四个配位原子犤O(1)、O(2)、N(1)和N(2)犦与Ni(II)配位,形成平面正方形NONi配位构型。     

Listening to Mothers II: Report of the Second National U.S. Survey of Women's Childbearing Experiences: Conducted January–February 2006 for Childbirth Connection by Harris Interactive? in partnership with Lamaze International*

With permission from Childbirth Connection, the “Executive Summary” for the Listening to Mothers II survey is reprinted, here. The landmark Listening to Mothers I report, published in 2002, described the first national U.S. survey of women''s maternity experiences. It offered an unprecedented opportunity to understand attitudes, feelings, knowledge, use of obstetric practices, outcomes, and other dimensions of the maternity experience. Listening to Mothers II, a national survey of U.S. women who gave birth in 2005 that was published in 2006, continues to break new ground. Although continuing to document many core items measured in the first survey, the second survey includes much new content, exploring earlier topics in greater depth, as well as some new and timely topics.     

化学改性活性炭对Cu(Ⅱ)离子吸附性能的研究

将市售粉状活性炭用16%硝酸进行氧化,再用0.1mol.L-1的氢氧化钠进行处理,制得化学改性活性炭,并对其吸附性能进行了研究.实验结果表明,改性后的活性炭较改性前对Cu2 离子的吸附能力提高60%以上.     

Seymour Benzer and T4 <Emphasis Type="Italic">r</Emphasis>II

One of the goals of genetics is to understand genes in as much detail as possible. For instance, with respect to a given gene, one would like to know its chromosomal location, its physical and genetic size, its neighbours, the number of mutations/alleles defining the gene, the order of mutations, the genetic/physical distance between them, etc. Thus, rather than focusing on the whole genome, one focuses on the finer details of a given genetic segment. The exercise of probing such details is called ‘fine structure genetic analysis’. There are several pioneers who have contributed enormously to this area in many bacterial and phage systems. Two stalwarts, Seymour Benzer and Charles Yanofsky, stand preeminent among them. In the following pages I present briefly Benzer’s outstanding work on the fine structure of the rII region of bacteriopage T4. These path-breaking studies contributed significantly to our understanding of the structure, organization and function of genes. R Jayaraman is an Emeritus Professor of Molecular Biology at the School of Biological Sciences, Madurai Kamaraj University, Madurai, where he taught and carried out research in the area of microbial genetics for three decades.     

有氧运动联合白藜芦醇对Ⅱ型糖尿病大鼠心肌细胞凋亡因子TNF-α、Caspase-3的影响

为探讨有氧运动联合白藜芦醇对Ⅱ型糖尿病大鼠心肌细胞凋亡因子TNF-α、Caspase-3的影响。选用2月龄雄性SD大鼠40只,随机选取8只大鼠作为正常对照组(ZA),以标准饲料喂养;其余大鼠在高脂高糖喂养基础上,腹腔注射小剂量链脲佐菌素(STZ),建立Ⅱ型糖尿病大鼠动物模型。将Ⅱ型糖尿病模型大鼠随机分成4组：模型安静组(TA)、模型运动组(TY)、模型灌胃白藜芦醇安静组(TB)、模型灌胃白藜芦醇运动组(TYB)。运动训练采用每周6 d的无负重游泳。7周后,检测各组大鼠空腹血糖水平、血脂指标、心肌组织细胞形态学变化,心肌TNF-α、Caspase-3含量。结果发现：①OGTT后30、60、120 min时间段TY、TB、TYB组血糖浓度与TA组比较,均非常显著性降低(P<0.01);与TA组相比,TY、TB、TYB组血清TC、TG、LDL水平均显著性或非常显著性下降(P<0.05或P<0.01)。与ZA组相比,TA组心肌呈现病理性变化;与TA组相比, TY、TB、TYB组心肌病理性变化明显减轻。②与ZA组相比,TA组心肌组织TNF-α显著性升高(P<0.01);与 TA 组相比,TY、TB、TYB 组心肌组织 TNF-α非常显著性下降(P<0.05);与 TYB组相比较,TY、TB组心肌TNF-α的表达量显著性升高(P<0.05)。与ZA组相比,TA组心肌组织Caspase-3显著性升高(P<0.01);与TA组相比,TY、TB、TYB组心肌组织Caspase-3非常显著性下降(P<0.05);与TYB组相比,TY、TB组心肌Caspase-3蛋白表达水平显著性升高(P<0.05)。结果说明：Ⅱ型糖尿病大鼠心肌组织呈现病理性变化,有氧运动、白藜芦醇及联合干预可能通过降低糖尿病大鼠心肌组织TNF-α、Caspase-3含量,降低心肌细胞凋亡因子的表达,改善糖尿病大鼠心肌组织的病理性变化。有氧运动联合白藜芦醇干预降低心肌组织凋亡因子表达的效果优于单一的有氧运动或白藜芦醇干预。     

Epideictic Rhetoric in the Service of War: George W. Bush on Iraq and the 60th Anniversary of the Victory over Japan

This essay explores the relationship between epideictic discourse and war through the analysis of George W. Bush's August 20, 2005, address at the Naval Air Station near San Diego, ostensibly to commemorate the 60th anniversary of the Allied victory over Japan. The case also serves as an exemplar for how Bush routinely interwove epideictic appeals with collective memories of World War II in order to promote the Iraq war and deflect criticism of his policies there. Bush praised the greatest generation and linked it to the current generation; blamed and dehumanized enemies of the past and present; advocated for war based on “lessons” from the past; and reinforced a shared identity to instill both obligation and confidence.     

The World War II crisis innovation model: What was it,and where does it apply?

World War II was one of the most acute emergencies in U.S. history, and the first where mobilizing science and technology was a major part of the government response. The U.S. Office of Scientific Research and Development (OSRD) led a far-ranging research effort to develop technologies and medical treatments that not only helped win the war, but also transformed civilian life. Scholars and policymakers have appealed to the wartime approach as a template for other problems, typically focusing on the Manhattan Project, but overlooking the broader OSRD effort of which atomic fission and dozens of other programs were a part. In this paper we bring OSRD into focus, describe how it worked, and explore what insights its experience offers today. We argue that several aspects of OSRD continue to be relevant, especially in crises, while also cautioning on the limits to generalizing from World War II to other settings.