Relationship between the City Central District''s Evolutionand The Formation of CBD

Agglomeration Effects and its evolution lead to the formation and further evolution to multi centers of a city's original center.During the further evolution to multi centers, there exists a rule which is proved to be true by the example of the formation and evolution of The dynamic adjustment of functions between business and trade within centersdrive the formation of a modern city's central business district(CBD).This rule discloses the following facts in planning and policy making of CBD:we must obey the natural rules of city centers' evolution,including the rules of Agglomeration Effects;we must lead CBD to mainly agglomerate business,not agglomerate everything;we can choose the original city center or other place out of the original city center as a CBD's location.     

CBD特色街道开放空间规划设计探讨

通过对CBD特色街道基本类型的划分,探讨了CBD特色街道开放空间的典型视觉形象特征,进而分析并总结了三大类型的CBD特色街道开放空间的规划设计要点。     

十字花科黑腐病菌纤维素酶主效基因XC0639 CBD结构域功能的分析

十字花科黑腐病菌(Xanthomonas campestris pv. campestris,Xcc)几乎能引起所有十字花科植物产生黑腐病[1]。该菌是研究植物与病原微生物互作的模式菌株之一[2]。植物病原菌在侵染宿主植物时需要先降解植物细胞的细胞壁,纤维素和半纤维素是细胞壁的主要成分。纤维素酶是降解纤维素生成葡萄糖的一类复合酶,主要由内切葡聚糖酶、外切葡聚糖酶以及β-葡萄糖苷酶3类酶组成,三者作用方式不同,但能协同催化水解纤维素[3]。     

生产性服务业和城市CBD发展研究

通过研究生产性服务业对CBD职能演变和空间结构演化的作用和影响,探讨了生产性服务业和城市CBD发展之间的关系,指出生产性服务业对城市,尤其是对城市CBD中的职能和空间作用明显。     

我国遗传资源产权化保护过程中所面临的困境

分析当前在对遗传资源进行产权化保护时国际层面上面临的困境,并分析这种困境对我国遗传资源采取权利保护时的影响.进而指出我国在国内层面上遗传资源产权化过程中所面临的困境.     

信息化时代CBD空间结构演变研究——以南京新街口为例

以南京传统CBD新街口地区为例，探讨了该地区空间结构的演变过程和特征，以及信息化时代新街口地区空间结构演变趋势。     

Cities and biodiversity: Perspectives and governance challenges for implementing the convention on biological diversity (CBD) at the city level

City governments are fundamental to implement international environmental agreements, such as the convention on biological diversity (CBD). Even though many of them are not directly involved in the negotiation of international agreements, which are signed by national governments, most of those agreements are in fact implemented at the city level. The importance of city governance to tackle the challenges of biodiversity loss has increased as urban population has grown enormously in the last decades, particularly in developing countries. The way cities are designed, planned and governed influences the magnitude of their direct and indirect impacts on biodiversity.This paper analyzes the relationship between cities, local governance and biodiversity. Initially, we examine the relationships between cities and biodiversity by looking at the major influences cities have on biodiversity loss or conservation within and outside the city boundaries, as well as the benefits of biodiversity conservation to cities, such as the provision of ecosystem services. The paper then moves to understand what are the main urban processes and governance mechanisms that can be improved to make cities effective to implement the directives of the CBD.Urbanization creates new challenges for biodiversity conservation. As a large part of the world’s population moves from rural to urban areas, there are changes in the link between human activities and biodiversity, and consequently to the way we should think biodiversity conservation policies. However, scarce attention has been given to understand how to make cities more biodiversity friendly, both within the urban fabric, but particularly in faraway places.     

郑东新区CBD景观空间形态设计初探

分析了郑东新区CBD的基本情况,总结出郑东新区CBD景观空间形态的风貌特征主要是区域形象的标志性、功能形式的多样性以及时空延续的动态性,从点、线、面3个方面对其景观空间的形态要素进行了解读,提出了郑东新区CBD景观空间形态设计应从丰富的视觉景观、通达使用性、清晰的识别标志和时空的完整与延续等方面把握设计原则。     

纤维糊精酶DM1与CBD的融合及融合酶性质分析

纤维糊精酶（cellodextrinase）属纤维素酶类中的一类,可以从短链纤维素分子上水解糖苷键生成葡萄糖或纤维二糖。曾克隆了纤维糊精酶DM1的编码基因,该酶与生黄瘤胃球菌（Ruminococcus flavefaciens）的Cellodextrinase A的一致性为52％。通过人工合成基因的方法合成了细菌来源的3个分别为家族_4_9（GenBank索引号为AAA73869）、家族Ⅲc（GenBank索引号为BABB33148）和家族10（GenBank索引号为CAA60493）的纤维素结合功能域（CBD）和连接桥（linker）的DNA序列。通过把编码纤维糊精酶DM1（GenBank索引号为ACA61162）的催化功能域（CD）的DNA序列与合成的CBD和连接桥的DNA序列进行融合,构建了3个融合酶,并分别在大肠杆菌BL21中得到过量表达。纤维素结合实验表明,3个纯化的融合酶对结晶纤维索（Avicel）和滤纸粉末均有结合能力,融合酶CBD_4_9-DM1、DM1-CBD10和DM1-CBDⅢc与结晶纤维素（Avicel）结合的蛋白质占总蛋白的比例分别为58．60％、51．16％和21．13％,与滤纸粉末结合的蛋白质占总蛋白的比例分别为65．59％、60．47％和22．54％,证实与原始酶相比3个融合酶的CBD均有纤维素结合的功能。酶学特性研究表明,融合酶的最适pH、最适温度、pH稳定性和温度稳定性等没有显著改变,均未检测到3个融合酶有新的活性,但它们对p-nitrophenyl β-D-cellobioside（pNPC）、p-nitrophenyl-β-D-glucopyranoside（pNPG）和lichenan等底物的比活力显著降低。3个融合酶CBD_4_9-DM1、DM1-CBD10和DM1-CBDⅢc对pNPC的比活力分别为原始酶DM1的26％、2％和2％,对lichenan的比活力分别为原始酶DM1的12％、8％和2％,几乎检测不到后两个融合酶对pNPG的酶活。