Synthesis of X(Y)-(EO)(n)-OCH₃ type heterobifunctional and X(Y)-(EO)(n)-Z type heterotrifunctional poly(ethylene glycol)s

A synthetic route to prepare acetal-protected heterobifunctional poly(ethylene glycol), allyl(1-ethoxyethoxy)-PEG-OH (allyl(EE)-PEG-OH), was successfully established using a newly synthesized initiator, trimethylolpropane allyl (1-ethoxyethoxy) ether (TMPAEEE). Heterobifunctional allyl(OH)-mPEG and heterotrifunctional allyl(OH)-PEG-alkyne were obtained, respectively, after modification from this precursor polymer. The polymers were characterized by SEC, 1H NMR, and MALDI-TOF mass spectroscopy. This approach is applicable for synthesizing a wide variety of X(Y)-(EO)(n)-OCH? type heterobifunctional and X(Y)-(EO)(n)-Z type heterotrifunctional PEGs.     

原生动物门(Profozoa)(一)

原生动物属于动物界中最原始、最低等的单细胞动物。由于它们的核与细胞质之间存在有明显的核膜,因此这类动物应归属于真核动物。除生活在海洋的放射虫和有孔虫等,原生动物在形态上虽然是一个体形微小(一般在300微米以下)的单细胞动物,但它们又区别于高等动物的体细胞,而是一个完整的,能够独立生活的有机体;它们除具有一般细胞共有的细胞膜、细胞质和细胞核外,还具有一般多细胞动物的运动,消化、呼吸、排泄、生殖和感应性等生理功能。因此,原生动物是一个结构复杂功能奇特的单细胞动物。     

Synthesis and Characterization of a Ditriflate-Bridged, Diiron(II) Complex with Syn-N-Donor Ligands: [Fe(2)(μ-OTf)(2)(PIC(2)DET)(2)](BARF)(2)

The synthesis and characterization of the diiron(II) complex [Fe(2)(μ-OTf)(2)-(PIC(2)DET)(2)](BARF)(2) (2), where PIC(2)DET is a 2,3-diethynyltriptycene-linked dipicolinic methyl ester ligand, are described. The dication in 2, contains, [Fe(2)(μ-OTf)(2)(PIC(2)DET)(2)](2+) two symmetry-equivalent iron atoms with octahedral coordination geometries. Each metal ion has a N(2)O(4) atom donor set that includes four atoms from two picolinic ester N,O chelate rings, as well as two oxygen atoms from the bridging trifluoromethanesulfonate groups. The Fe(2)(μ-OTf)(2) core of 2 is stabilized by two PIC(2)DET ligands that bind the two metal ions in a head-to-head fashion, leading to an Fe···Fe distance of 5.173(1)?. Molar conductivity data for 2 are consistent with Fe(2)(μ-OTf)(2)(PIC(2)DET)(2)](2+) retaining its identity in acetone solutions, where it behaves as a 2:1 electrolyte. (1)H NMR spectroscopic, solution (d(6)-acetone) and solid-state magnetic susceptibility data all indicate that the iron atoms of 2 are high-spin (S = 2). A fit of the magnetic data (2 - 300K) to a spin-only isotropic exchange Hamiltonian H = -2JS(1)·S(2) are consistent with weak antiferromagnetic coupling between the two iron atoms with J ~ -0.99(2) cm(-1) and g = 2.10(1).     

西藏蕨类植物增补(II)(英文)

报道了 8种蕨类植物为西藏新记录 ,并讨论了西藏蕨类植物的区系特点和分类问题     

生理卫生教学参考资料(下册)(续)

第三节脑本节主要闡述脑的构造和它的机能,从量力性的观点出发,教材仅介紹延髓、小脑和大脑三个部分,这是适合实际情况的。延髓的机能着重的介紹了几个神經中枢的机能——呼吸中枢、心搏中枢、血管舒縮中枢和唾液分泌中枢。这几种中枢的机能在上冊各章部已敍述了一些感性知識,例如講到血的流动时就举出肌肉活动加强时,它里面毛細血管舒张的数目就多一些。这一段內就把这些感性知識提高到理論來認識,进一步加深和巩固反射的概念。同时还为講高級神經活动打下基础。例如唾液分泌中枢的位置等。     

《遗传学原理》(第3版)(中文版)(彩色版)

D.P.Snustad M.J.Simmons等著赵寿元乔守怡等译(复旦大学)书号:978-7-04-017147-1出版日期:2011年4月定价:260.00插图:1000幅字数:180万这是北美较流行的一本优秀的遗传学入门教材。     

Abundance and degree of dispersion of genomic d(GA) n ·d(TC) n sequences

Summary The abundance of d(GA) _n ·d(TC) _n tracts was determined in genomes of rodents and primates. Dot blot hybridization assays revealed that such tracts constitute 0.40%, 0.30%, and 0.40%, respectively, of the rat, hamster, and mouse genomes, but only 0.07% and 0.05% of the human and monkey genomes. A plaque hybridization assay of rat and human genomic libraries showed that 37% and 16%, respectively, of the recombinant phages in these libraries contain d(GA) _n ·d(TC) _n tracts. A survey of sequences stored in the GenBank data bank showed that a significant fraction of the stored rodent genes (about 2.0%) contain long d(GA) _n ·d(TC) _n tracts (n> 30) with <10% mismatching. The primate genes contain only shorter tracts (n<15) with <10% mismatching. In addition, the rodent and the primate genes contain tracts with larger degrees of mismatching. The chicken, which represents an entirely different branch of the evolutionary tree, was found to be as low in d(GA) _n ·d(TC) _n tracts as the primates. It is suggested that a common ancestor of the rodents has acquired the ability to amplify d(GA) _n ·d(TC) _n tracts.     

Prescott微生物学(第10版)(影印版)

正出版:高等教育出版社出版时间:2018年7月ISBN:978-7-04-049873-8定价:180元内容简介本书原版是国际上最具声誉的微生物学教科书之一,2017年最新版次为第10版。本书秉承《Prescott微生物学》一直以来博大精深、新颖、系统的特点,几乎涵盖了微生物学领域的所有概念,具有一定的深度和广度。全书共9篇43章,既包含学习微生物学的目的、微生物学的化学原理、研究微生物的技术方法、微生物的特     

秦岭的锈菌(续Ⅰ)(英文)

全文分3次连载,共报告了采自秦岭林区的锈菌34属228种。其中有6个新种：槭锈孢锈（Aecidiumaceris）、糙苏鞘锈（Coleosporiumphlomidis）、秦岭栅锈（Melampsoratsinlingensis）、荩草生柄锈（Pncciniaarthraxonicola）、冠毛草柄锈（Pncciniastephanachnes）和头状杜鹃夏孢锈（Uredorhododendri-capiati）;中国新记录锈菌13种：米诺锈孢锈（Aecidiumminoense）北极栅锈（Melampsoraarctica）、紫藤赭痴锈（Ochropsorakraunhiae）、青篱竹柄锈（Pucciniaarundinariae）、高大柄锈（Pucciniaexelsa）、哈氏柄锈（PucciniakawakamiensisKakishima）、大泽柄锈（Pucciniaohsawaensis）、极细柄锈（Pucciniapraegracilis）、美丽柄锈（Pucciniapulchella）、毡毛柄锈（Pucciniavelutina）和帚菊夏孢锈（Uredopertyae）。文中列出了所有这些锈菌的寄主植物学名、分布及标本号,对新种作了拉丁文描述和图解,并对这些新种和部分已知种作了讨论。本研究标本系作者及其同事们于1973～1998年采自秦岭林区的太白山、太白黄柏塬、宁陕火地塘及宁西、石泉、佛坪龙草坪、周至楼观台、南五台山、宝鸡天台山、辛家山、凤县等地。所有标本保存于西北林学院真菌标本室（NWFC）。     

报刊目录索引选(动物部分)(二)

鸟类蓝马鸡的栖息地、活动、食性与繁殖研究郑生武等 动物学报[953,29(l):71一8,中国黑〔短脚」鸭月y户“户‘‘二口袱口g二,翻‘MQlle,) 亚种订正杨德华动物学研究1983,《l):8北京鸭肝脏线粒休DNA的制备及性质赵帮涕等 北京大学学报l夕53,(1):72一77美仅仅是表面的吗?La。。T”妇ey陈维益译美国 科学新闻1953,(2):t一3‘鱼鸟和黄昏鸟尚玉昌化石19的,(l): 22一23丑八怪一美洲鸦鹅凌桂生等编译海洋1983, (2):6麻雀染色体的新核型王应祥等遗传1983,5(l): 21ee22鹊巢鸿占剑萍科学之窗l,83,(2):犯鸡的胚胎发育阶段透明标本的制作蔡文利生物学…     

铁线莲属研究随记(VI)(英文)

讨论了Clematis eriopoda Maxim.和sect.Atragenopsis Boiss.的地位,认为这二分类群均应成立;描述了2新种,1新变种;过去长期被归并的卷萼铁线莲C.tubulosa得到恢复;Clematisheracleifoliavar.ichangensis被转移改作卷萼铁线莲的变种;首次给出光叶铁线莲Clematisglabrifolia的果实的形态描述。     

《高技术通讯》(中文版)(英文版)

《高技术通讯》(中文版 )和《高技术通讯》(英文版 )是经国家科学技术部批准 ,由国家高技术研究发展计划 (86 3计划 )联合办公室与中国科学技术信息研究所共同主办的综合性学术刊物 ,是供我国高技术研究人员及时发表其研究成果和进行国内、国际学术交流的园地 ,旨在促进我国高技术研究的发展和扩大其在国内外的影响。中文版为月刊 ,大 1 6开本 ,1 1 2页 ,ＩＳＳＮ1 0 0 2 - 0 4 70 ,ＣＮ1 1 2 770 Ｎ ;英文版为季刊 ,大 1 6开本 ,96页 ,ＩＳＳＮ1 0 0 6— 6 748,ＣＮ1 1 3 6 83 Ｎ。内容涉及生物、计算机、电子与光电子技术、现代通信、自…     

A Structural Transition in d(AT) n ·d(AT) n Inserts within Superhelical DNA

Abstract

We have constructed plasmids carrying d(AT)_n·d(AT)_n inserts of different lengths. Two- dimensional gel electrophoresis patterns show that an increase in the negative superhelicity of these DNAs brings about a structural transition within the inserts, resulting in a reduction of the superhelical stress. However, this reduction corresponds to the expected values neither for cruciform nor for the Z form. Those DNA topoisomers in which the structural transition had occurred proved to be specifically recognizable by single-strand-specific endonuclease SI, with the cleavage site situated at the centre of the insert. These data, as well as kinetic studies, suggest that the cloned d(AT)_n·d(AT) _n sequences adopt a cruciform rather than the Z-form structure. We discuss plausible reasons of the discrepancy between the observed superhelical stress release and that expected for the transition of the insert to the cruciform state.     

中国的涧黾(半翅目)(英文)

本文简述了中国涧黾属的研究进展和概况。阐述和纠正了过去在种类鉴定和研究中的错误和混乱状况。提供了完整的中国涧黾16个种的检索表及其地理分布。介绍了涧黾属昆虫的典型栖息环境。描述了分别采自湖北和广东的三个新种。     

海南多孔菌研究(1)(英文)

20 0 2年对海南省尖峰岭和吊罗山自然保护区的木材腐朽菌进行了考察 ,共采集标本 2 72种 ,发现多孔菌 62种 ,其中硬附毛菌 (Trichaptumdurum)为中国新记录种 ,并根据中国的材料对该种进行了详细描述。包括黄胶孔菌 (Favolaschiavolkensi) ,黑线齿菌 (Grammothelefuligo) ,帕托纤孔菌 (Inonotuspatouillardii) ,亚拉巴马厚孢孔菌 (Pachykytosporaalabamae) ,皮生多年菌 (Perenniporiacorticola) ,灰孔多年菌 (Perenniporiatephropora) ,木垫白薄孔菌 (Physisporinusxylostromatoide) ,核桃隔孔菌 (Protomeruliuscaryae) ,淡黄裂孔菌 (Schizoporaflavipora) ,常见硬皮菌 (Skeletocutisvulgaris) ,红木色孔菌 (Tinctoporellusepimiltinus) ,热带平伏饰孢 (Wrightoporiatropicalis)等 1 2种为海南省新记录种。