The roots of the silver tree: Boyle,alchemy, and teleology

Though Robert Boyle called final causes one of the most important subjects for a natural philosopher to study, his own treatise on the subject, the Disquisition about Final Causes, has received comparatively little scholarly attention. In this paper, I explicate Boyle's complex argument against the use of teleological explanations for inanimate bodies, such as metals. The central object of this argument is a mysterious allusion to a silver plant. I claim that the silver plant is best understood as a reference to alchemical product: the Arbor Dianae, an offshoot of George Starkey's recipe for the Philosophers' Stone. Then, I show how the context of alchemy not only clarifies Boyle's argument but also places it within a wider dialectic about matter and teleology. I then contrast the parallel arguments of Boyle and John Ray on the question of whether metals have divine purposes and show that the difference is explained by Boyle's belief in the transmutation of metals.     

日本大学生就业状况及其启示

目前,在经济增长趋缓的大背景下,如何促进大学生就业成为各国的难题。近年日本为应对大学生就业压力,政府、高校、用人单位等社会各方面都积极行动,显著提高了大学生的就业率。我国大学生就业情况比日本更加严峻,日本实施的一系列就业促进政策对改善我国大学生的就业状况具有一定的启示。我国需要从加强就业政策的事中事后监管、充分发挥行业协会的作用、改善高校就业指导模式、加强高职(专科)院校建设等方面入手,不断提升我国的大学生就业状况。     

Cloning and expression of the vp39 gene ofBombyx mori nuclear polyhedrosis virus inE. coli

The nuclear capsid protein gene (vp39) ofBombyx mori nuclear polyhedrosis virus (BmNPV) was amplified successfully by PCR technique and inserted into pGEM 3zf(+). The 5′ and 3′ terminal area of the amplified vp39 gene were sequenced with silver-staining dideoxy method. Bmvp39 gene was sub-cloned into the expression vector pRSET-A, and transformed intoE. coli BL21. This gene was highly expressed by IPTG induction. SDS-PAGE analysis showed that the expressed protein is about 38 kd, and the expressed amount reached maxium in 4 h with IPTG induction. Supported by the National Natural science Foundation of China and the Doctoral Foundation of Edn carto Committee Liu Deli: born in 1954, Doctoral Candidate from Huazhong Normal University To whom correspondence should be addressed: (027-7882712-2938)     

系统素信号转导研究进展

系统素最初是指在番茄叶片中发现的与植物防卫反应相关的一种18个氨基酸的多肽信号,随着在茄科植物中其他相类似的多肽防卫信号的发现,现系统素被定义为茄科植物中具有调节防卫基因功能的一类多肽信号家族.近年来对系统素信号转导的研究取得了很大进展,不仅在系统素信号转导途径上,而且在系统素与其他信号转导途径的相互作用上均有了很大进展.文中介绍了系统素的信号转导途径以及系统素与其他信号转导途径,如与油菜素甾醇类激素(BRs)和紫外线-B(UV-B)信号转导途径之间的相互作用,并对这一领域的研究进行了展望.     

核衣壳蛋白VP39结构分析与杆状病毒的进化研究

在测定了BmNPV—Ch(中国株)和HaMNPV vp39基因序列的基础上，推导出相应的氨基酸顺序，并与AcMNPV、OpMNPV、LdMNPV、BmNPV—Ja(日本株)的VP39蛋白的氨基酸顺序进行了比较。分析结果表明：在已知的各种杆状病毒中，VP39蛋白是一个保守性较强的蛋白质，Bm—NPV—Ch VP39蛋白与AcMNPV、OpMNPV、LdMNPV、BmNPV—Ja和HaMNPV VP39蛋白的氨基酸同源性分别是93．7％、58．2％、39．9％、97．1％、92．8％。HaMNPVVP39蛋白与AcMNPV、OpMNPV、LdMNPV、BmNPV—Ja和BmNPV—Ch VP39蛋白的氨基酸同源性分别为97．3％、59．0%、40．2%、93．1％、92．8％。通过氨基酸亲水性分析比较，探讨了VP39蛋白结构与杆状病毒进化间的关系。     

用VF6.0编程实现贵州省各院校成教毕业生数据与录取数据的碰撞核对

用VF6.0编程实现贵州省各院校成教毕业生数据与该批毕业生考取成高当年的录取数据的碰撞核对,以筛选出与录取信息不符或在录取表中没有录取记录的毕业生数据。     

A Study on the Surface Structures of Viscose-based Activated Carbon Fiber by FT-IR Spectroscopy and XPS

Using viscose fiber (VF) as starting material and common steam as activating agent, formation of oxygen structures in activated carbon fiber is investigated. In the preparation of samples, VF was first heated at temperatures between 450℃ and 900℃ in N_2 artmosphere. Then, in a successive activation stage, the product carbonized at 600℃ was activated in steam at 450-900℃ for 30 min, and at 600℃ for 5-30 min. The other carbonization products were activated at 600 and 900℃ for 30 min respectively. The products activated at 900℃ were then activated at 450℃ for 30 min again. The starting materiah carbonized products and all activation products were examined by FT-IR spectroscopy and some products were examined by X-ray photoelectron spectroscope (XPS). And the yields of the carbonized and activated products were calculated. By analysing these spectra, the amount of oxygen-containing functional groups of the activated products attained under various activation time, various activation temperature and     

基于应用型人才培养的大学生兼职实证分析

目前大学生兼职日益普遍,且兼职学生占学生总人数比例持续增加。然而大学生的兼职行为缺乏相应的引导和监督,使日益升温的校园兼职现象与管理监督力度不足的矛盾十分突出,亟待解决。对大学校园兼职现状进行调查分析,尝试构建四位一体的大学生兼职监督管理体系。     

年轻火山岩激光40Ar/39Ar定年中的n值与MSWD值

激光熔蚀⁴⁰Ar/³⁹Ar等时线法是第四纪年轻火山岩样品精细定年的新方法, 该方法处于逐步完善过程中。针对怎样判定获得的年龄结果是否可靠的问题, 通过对数据处理过程中所用参数的分析, 认为样品属性是决定年轻火山岩精细定年结果质量和可靠性的关键因素, 与样品测试数n值相关的加权均方差MSWD(mean square weighted deviation)是判断同一样品各测试点的数据是否符合正态分布, 能否用来客观地评价测试结果, 进而评估样品是否适合进行相关测试, 结果是否可靠的重要指标。其次, 属于同一真实年龄值样品的MSWD在99.7%置信区间的取值范围可通过计算加以确认, 并提出对于表面年龄和等时线年龄数据, 必须定量地考察相应的MSWD值, 判定在具有足够样品测试数(足够大的n值)的情况下, 是否符合概率统计的正态分布, 确定样品是否对应同一年龄真实值。在MSWD值达不到理想值1.0的情况下, 可以利用表面年龄概率密度曲线, 区分测试样品内部包含的非同源或非等时或封闭不好体系的数据, 再结合MSWD与n值关系, 适量地去除部分偏离正态分布的测试数据, 识别出可能归属多个年龄真实值的测试数据组, 并以此计算不同数据组的反等时线年龄, 获得年轻火山岩喷发的准确年龄。