树枝状聚合物分子

化学家们现在能够建造分形超级分子。这类新的聚合物（称为树枝状聚合物）有希望在生物技术和环境保护中显示出重大价值。     

武检专家看伊拉克

在巴格达大学的萨达姆生物技术中心一座堪称现代化的研究设施中，从国外秘密进口的设备比比皆是，有的用于大量复制DNA片段，有的用于凝胶测试以确定蛋白质分子的大小。Rocco Casagrande回忆说：“看起来，你仿佛是来到了美国一个设备精良的研究所的实验室里。”身为联合国核查人员的Casagrande于2000年12月中旬开始赴伊拉克的各个有关设施进行检查。     

Narcissism and adjustment in preadolescence

Narcissism-a strong need to be admired for a grandiose self-is a problematic personality trait for children as well as adults. This study of 236 preadolescents (M age = 11.3 years; 129 girls, 107 boys) evaluated 2 intrapersonal (cognitive) pathways by which narcissism might contribute to maladjustment. The first was that narcissism combines with salient self-serving gender stereotypes to encourage aggressive and selfish behavior. The second was that narcissism places children who perceive that they are failing to realize their grandiose self at risk for aggression and depression. Although concurrent-correlational, the data support the pathways, illuminate the content and dynamics of narcissistic children's minds, and suggest directions for future investigation.     

费马定理卷土重来

费马定理卷土重来郭凯声，郭敏物理学家兼诗人皮特·海因说过：“值得人们研究的问题常常会反扑过来从而证明其价值。”费马最后定理正好就是这种情况。它在去年夏天看来已被击倒之后却又从拳击垫上跳起来以进行新一轮较量。这一表面上十分简单的定理是说，当指数Ｎ大于２...     

生物医学界的政客

2003年4月初，一个下着雨的寒冷上午，美国国会众议院拨款委员会听证厅里的气氛却异常热烈。来自罗得岛州的众议员J．Kennedy正在大挑小布什政府的毛病。他责备说，美国国家卫生研究院(NIH)已获得16.25亿美元的拨款从事生物反恐研究，但它并未研究如何管理遭受生     

Near-peer teaching in an anatomy course with a low faculty-to-student ratio

Near-peer teaching is an educational format which utilizes tutors who are more advanced in a curriculum's content to supervise students' activities and to act as instructors in laboratory settings. This format is often used in anatomy laboratory courses. The goal of the present study is to describe the design and implementation of near-peer teaching in an anatomy course and to evaluate students' perceptions of the program. A total of 700 students were registered for this anatomy course which employed near-peer instructors. Of enrolled students, 558 (79.7%) agreed to participate in this study. In general, the practical section (e.g., the clinical hour, image-based anatomy session, and gross anatomy laboratory) of the course was viewed more favorably compared to the theory section (54.8%, n = 306), with dissection and prosection in the laboratory rated as the most valued experiences (34.9%, n = 195). Near-peer teaching is a viable option that satisfies the demands of modern curricula using small groups. This format stimulates learning within courses that have large numbers of students and low faculty-to-student ratios.