检索结果-南通市图书馆

Fringe View: Problems and Construction of Human Settlement environment for "Village-in-City"

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Population,resources and environment 2005年第1期3卷 18-26页

作者： Mo Chuangrong , Li Xia , Wang Shugong 1 1,2 & Chen Xingeng 1 1. Institute of environmental Sciences, sun yat-sen university, guangzhou guangdong 510275, china 2. center of earth environment & resources, sun yat-sen university, guangzhou guangdong 510275, china Institute of environmental Sciences Sun Yat-Sen University Guangzhou Guangdong 510275 China center of earth environment & resources Sun Yat-Sen University Guangzhou Guangdong 510275 China

The construction of human settlement environment is one of the important contents in the domain of sustainable development. We try to annotate human settlement environment for "village- in-city" from the angle of fringe view. According to the macro-system thought of human settlement environment science, the evolvement, which can be generalized into four phases, connotation and problems (including social, economic, and environmental problems) of "village-in-city" are discussed primarily in this paper. Some domestic and international researches and practices are also summarized and assessed in the paper. Based on the analysis, some appropriate clues and suggestions for the construction of "village-in-city" have been put forward.

关键词： human settlement environment urbanization "village-in-city" fringe view sustainable development

Pluripotent Embryonic Stem Cells Developed into Medulloepithelioma in Nude Mice Eyes

在线全文

学校读者我要写书评

暂无评论

Eye Science 2002年第1X期18卷 37-44页

作者： Yongping Li , Xiufeng Zhong , Jianhua Yan , Jianxian Lin, Song Tan Xuan Wu, Shulong Li, Guanguang Feng, Yuzhen Yi Zhongshan Ophthalmic center, sun yat-sen university, guangzhou 510060, china Department of Pathophysiology, sun yat-sen university, guangzhou Zhongshan Ophthalmic center Sun Yat-sen University Guangzhou 510060 China

Purpose: The pluripotent embryonic stem cells can differentiate into various kinds offormal tissues. There is no previous report on the differentiation of embryonic stem cellin the intraocular environment. In this paper, the authors tried to investigate theintraocular growth character of mice embryonic stem cells in nude ***: Murine embryonic stem cells were cultured and maintained in anundifferentiated state in vitro. They were transplanted into the right eyes of 20 nude miceby microinjection under operating microscope. Animal eye observation, light microscopeand immunohistochemical examinations were ***: Two to three days after transplantation, small pieces of gray-white materialcould be viewed in the vitreous cavity. Between the 15th and 20th day, the gray-whitemass grew into the anterior chamber in 4 nude mice eyes. Then, the mass at the anteriorchamber extended extraocularly. On the 30th day, a remarkable proptosis was observedin two of the four nude mice. In 6 to 45 days, the mice were executed for morphologicalexamination which showed the following typical structures: (1) Undifferentiated cellswith prominent nucleolius. (2) Flexner-Wintersteiner-like rosettes. (3) Medulloepithe-lioma-like structure: the cells were arranged in sheets, cords, tubes, and cysts. (4) Large,spindle-or astrocyte-like cells. (5) Cartilage-like structure. Immunohistochemically, mostof the cells were highly positive in NSE staining and a few cells were moderately positivein GFAP ***: Both animal eye findings and morphologic examinations certificated thatthe transplanted embryonic stem cells could grow in the eyes of nude mice anddifferentiate into intraocular medulloepithelioma.

关键词：胚胎干细胞移植髓上皮瘤眼肿瘤

在线全文

学校读者我要写书评

暂无评论

旅游业中的二元结构及公共政策研究

思想战线 2004年第1期30卷 96-100页

作者：徐红罡中山大学地理环境学院旅游发展与规划研究中心广东广州510275

旅游业中二元结构具有普遍性和长期性的特点,非正规经济部门给那些处于边缘地位、无法通过正规就业而参加主流经济的人们提供了一条应急之道,非正规企业在旅游业中也起着不可缺少的作用,它本身就是旅游吸引物的一个重要组成部分,能有效... 详细信息

旅游业中二元结构具有普遍性和长期性的特点,非正规经济部门给那些处于边缘地位、无法通过正规就业而参加主流经济的人们提供了一条应急之道,非正规企业在旅游业中也起着不可缺少的作用,它本身就是旅游吸引物的一个重要组成部分,能有效地降低游客与本地居民的冲突,并提供特色化服务,这是旅游地可持续发展的关键。

关键词：二元结构非正规部门公共政策

Multiorgan engraftment of donor-derived human cells in mice by transplanting human umbilical cord blood-derived CD133(+) cells into murine blastocysts

在线全文

学校读者我要写书评

暂无评论

Multiorgan engraftment of donor-derived human cells in mice ...

Ambient formaldehyde concentrations in summer in 30 Chinese cities and impacts on air cleaning of built environment

第九届中国实验动物科学年会（2010新疆）

作者： Yan sun~2,Dong Xiao~1 1) center of Experimental Animals,sun yat-sen university,guangzhou 510080,guangdong Province, china 2) Cancer Research Institute,Southern Medical university,guangzhou 510515,guangdong Province, china

Objective A relatively unperturbed developmental system in vivo was employed to fully evaluate the plasticity of human CD133(+) stem ***:To address this,we transplanted human umbilical cord blood(hUCB)-derived CD133(+) cells into murine blastocysts to develop the noninjury human-mouse chimeras(HMCs),in which the donor-derived human cell engraftment in multiple organs of recipients was detected by human-specific PCR for human Alu gene,in situ hybridization(ISH) for human Alu sequences and immunohistochemistry(IHC).Results:we took advantage of the proliferative and permissive environment of the developing pre-immune embryo to successfully develop HMCs,in which blastocyst transplantation of human CD133(+) stem cell population led to the donor-derived human cell engraftment in multiple organs(i.e.,liver,spleen,thymus,heart,kidney,blood,lung,gut,etc),as revealed by PCR,ISH and IHC for detecting humanβ2-microglobulin(β2-M) *** data demonstrated the formation of donor-derived human hepatocyte-like cells(hHLCs) with different cellular phenotypes,as demonstrated by positively immunostaining for human-specific alpha-fetoprotein(AFP),cytokeratin 19(CK19),cytokeratin 8(CK8) and cytokeratin 18(CK18) in the recipient ***,the transplanted human donor cells underwent site-specific differentiation into vWF-positive, CD34-positive and vimentin-positive human endothelial-like cells within various blood vessel(i.e,arteries and veins) walls of the multiple organs in ***:Taken together,these in vivo findings strongly indicate the plasticity of CD133(+) stem cells in ***133(+) stem cells might be useful for research and for clinical application.

关键词： Human umbilical cord blood CD133(+) cells Mice Blastocyst microinjection Embryonic microenvironment Plasticity Chimerism Human-mouse chimeras(HMCs) Humanized liver Human hepatocyte-like cells Human endothelial-like cells Stem cells

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Energy and Built environment 2024年第4期5卷 493-499页

作者： Shuolin Qiu Zirui He guangdong Liu Zhen Ding Zhongming Bu Jianping Cao Wenjing Ji Wei Liu Chunxiao Su Xinke Wang Fan Liu Ting Li Hua Qian Cong Liu School of Energy and environment Southeast UniversityNanjingJiangsu210096China china Green Development Investment Group Co.LTD Beijing100000China Department of environmental Health Jiangsu Provincial Center for Disease Control and PreventionNanjingJiangsu210009China Department of Energy and environmental System Engineering Zhejiang University of Science and TechnologyHangzhouZhejiang310023China School of environmental Science and Engineering Sun Yat-sen UniversityGuangzhouGuangdong510006China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing100083China Institute for Health and environment Chongqing University of Science and TechnologyChongqing401331China School of environment and Architecture University of Shanghai for Science and TechnologyShanghai200093China School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an710049ShaanxiChina Tsinghua university Beijing100084China

Formaldehyde is an important carcinogen commonly found *** indoor sources have been intensively *** study on outdoor formaldehyde concentration,which is potentially an important source to indoors,remains *** study attempts to characterize temporal and spatial distribution of the atmospheric formalde-hyde concentration in Chinese *** variation of ambient formaldehyde was examined in 6 cities and peak hours were identified between 12:00 pm and 3:00 ***,outdoor formaldehyde concentrations were measured in the peak hours in 30 cities during the summer months of Jul.-Aug.,*** formaldehyde concentrations in the peak hours fell into a range of 0.005-0.087 mg/m^(3)(median value is 0.027 mg/m^(3)),87.7%of which have exceeded the chronic reference exposure criteria of 0.009 mg/m^(3) set by Office of environmental Health Hazard *** risk analysis suggests that exposure to ambient formaldehyde could cause a median carcinogenic risk of 1.9×10^(−5)(3.17×10^(−6)-6.13×10^(−5)),higher than threshold limit of 10−*** correlation analysis of the 30 cities shows that ambient summertime atmospheric formaldehyde concentrations of the city are positively correlated with its Gross Domestic Product(r=0.48).We also found that the outdoor formaldehyde concentrations in urban areas(median:0.017 mg/m^(3))is slightly higher than those in suburban areas(median:0.013 mg/m^(3)).Results here prove that outdoor formaldehyde is ubiquitous in Chinese cities and reduces effectiveness of ventilation in dilution indoor *** it would underestimate air cleaner capacity needed by a factor of about *** should be accounted for in health analysis and air quality engineering control design of built environment in the future.

关键词： Atmospheric formaldehyde Temporal distribution Health risk Ventilation efficiency

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

混合蛙跳算法和投影寻踪模型的洪水分类研究

水电能源科学 2009年第2期27卷 62-64页

作者：汪丽娜陈晓宏李粤安林凯荣中山大学水资源与环境研究中心广东广州510275 广东省近岸海洋工程重点实验室广东广州510275 广东省水利厅广东广州510635

采用混合蛙跳算法优化投影寻踪模型对西江流域进行洪水分类的实例研究,并与其他优化算法进行比较。结果表明,混合蛙跳算法和投影寻踪模型进行洪水分类可行、有效。

关键词：混合蛙跳算法投影寻踪模型洪水分类

Gene-environment-virus interaction in the pathogenesis of nasopharyngeal carcinoma

在线全文

学校读者我要写书评

暂无评论

Gene-environment-virus interaction in the pathogenesis of na...

Water quality characterization of road runoff in urban area of guangzhou, china

第五届海峡两岸细胞生物学学术研讨会

作者： Yi-Xin Zeng State Key Laboratory of Oncology in Southern china, Department of Experimental Research and Biotherapy center, sun yat-sen university Cancer center, guangzhou 510060

Nasopharyngeal carcinoma (NPC) has a striking geographical and ethnic distribution. The incidence rates are low throughout most of the world, usually less than 1 per 100,000. However, NPC is among the leading causes of death in Cantonese and in several other southern Chinese populations. In fact, the incidence rate per 100,000 for males is higher than 40 in some Cantonese-speaking populations of guangdong province. Similarly, the rate

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 144-144页

作者： Huayang GAN1, Muning ZHUO2, Dingqiang LI2, Yongzhang ZHOU3 1 guangzhou Institute of Geochemistry, Chinese Academy of Sciences, guangzhou 510640, china 2 guangdong Institute of Eco-environment and Soil, guangzhou 510650, china 3 center of earth environment and resources, sun yat-sen university, guangzhou 510275, china

Atmospheric HONO formation during and after the Spring Festival holidays in a coastal city of china

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2023年第5期127卷 251-263页

作者： Xue Ni Cuizhi sun Yongyun Zhang Baoling Liang Shengzhen Zhou guangdong Lan Jun Zhao School of Atmospheric Sciences Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studiesand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Sun Yat-sen UniversityZhuhai 519082China guangdong Provincial Observation and Research Station for Climate environment and Air Quality Change in the Pearl River Estuary Zhuhai 519082China Key Laboratory of Tropical Atmosphere-Ocean System Ministry of EducationZhuhai 519082China

Nitrous acid(HONO)is an important source of hydrogen oxides(HOx),which affects air quality,the atmospheric oxidation capacity,and human ***,we present ambient measurements of the HONO concentrations in Zhuhai,a coastal city in Southern china,from February 7 to March 15,*** campaign was classified into two periods during(P1)and after(P2)the Spring Festival *** average HONO mixing ratio during P2(1.19±0.85 ppbv)was much higher than that during P1(0.24±0.18 ppbv),likely due to the contribution of homogeneous HONO *** nighttime,the heterogeneous conversion rate during P2(0.0089/hr)was considerably higher than that during P1(0.0057/hr),suggesting a higher heterogeneous NO_(2) conversion ***,the heterogeneous NO_(2) conversion was the dominant way during P1 with a high percentage of 88%,while comparable ratios of heterogeneous and homogeneous formation were found(54%vs.46%)during P2,indicating that the homogeneous formation was also important during *** daytime,homogeneous reaction was the major known pathway,with a contribution of 16%during P1 and 27%during P2,leaving large unknown HONO sources which reasonably correlated with the photo-enhanced NO_(2) *** case scenarios were additionally explored,showing that there might be a primary emission source during one scenario(February 17-18)and vehicle emissions might be the major unknown HONO source for another scenario(March 3–5).The results suggest that large unknown daytime sources still exist which need more future ambient and laboratory studies.

关键词： Nitrous acid Nocturnal and daytime budget Heterogeneous conversion Homogeneous formation Coastal area