树的优美标号

1963年,G·Ringel 提出“所有树都是优美图”的著名猜想。它是图论中迄今尚未解决的难题之一。本文把树看成若干个“星”的串接和并接,从结构上对树的优美标号进行了探讨,对相当广泛的树类,给出了它们的优美标号。     

Polo-box domain: a versatile mediator of polo-like kinase function

Members of the polo subfamily of protein kinases have emerged as important regulators in diverse aspects of the cell cycle and cell proliferation. A large body of evidence suggests that a highly conserved polo-box domain (PBD) present in the C-terminal non-catalytic region of polo kinases plays a pivotal role in the function of these enzymes. Recent advances in our comprehension of the mechanisms underlying mammalian polo-like kinase 1 (Plk1)-dependent protein–protein interactions revealed that the PBD serves as an essential molecular mediator that brings the kinase domain of Plk1 into proximity with its substrates, mainly through phospho-dependent interactions with its target proteins. In this review, current understanding of the structure and functions of PBD, mode of PBD-dependent interactions and substrate phosphorylation, and other phospho-independent functions of PBD are discussed.     

18世纪中国的养蚕歌和蚕庙的城市化

旨在通过对清代江南地区下层社会养蚕业的民间活动与宗教等案例的研究来考察民间宗教与技术知识的关系.该研究是对于16世纪到18世纪社会文化转变中,民间宗教对中国科技以及医学发展的影响的研究计划中的一个组成部分.首先着眼于农村养蚕业的民间宗教集会活动和宗庙如何成为文化、经济以及技术交流的中心及其如何连结同一地区中的各个社团、如何连结地方社会甚至超地方并进而形成一定的社会网系统这一问题.到了18世纪,随着养蚕业日益重要,地方绅士与小地方官为了控制民间养蚕活动,而在城市附近创建了越来越多的蚕神庙,并创立了各类相关仪式.最后分析了民间养蚕诗歌(通常被吟诵用以崇拜蚕神)如何在宗教精神的背景下来编排养蚕方面的经验甚至很多相关的技术知识这一问题.