检索结果-南通市图书馆

Landscape planning and ecology construction of wetland comprehensive protected area system in the Sanjiang Plain

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2000年第3期12卷 361-366页

作者： LIU Hong\|yu, LU Xian\|guo, LIU Zhen\|qian (Changchun Institute of Geography, Chinese Academy of Sciences, Changchun 130021, China) 中科院长春地理所吉林长春 1 3 0 0 2

Wetland is one of the richest biodiversity areas in the earth. The main purpose of establishing wetland protected area is to protect biodiversity, and the protection of ecosystem diversity and landscape diversity is the key to protect biodiversity. In order to protect regional ecosystem and landscape, it is a good way to establish wetland comprehensive protected area which connected wetland nature reserves by habitat corridors. The Sanjiang Plain as a study area, its landscape evaluation index system on wetland protected area was studied, and some problems on landscape planning and ecology construction were further approached in this *** showed that establishing wetland comprehensive protected area is very important to protect regional wetlands, to maintain ecological balance, and to improve the sustainable development of agriculture and industry in this region.

关键词： landscape planning ecology construction wetland protected area

SYNTHESIS AND CHARACTERIZATION OF NOVEL MICROPOROUS ALUMINOPHOSPHATES.

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1991年第1期2卷 81-84页

作者： Long YU Wenqin PANG (Department of chemistry,Jilin University,Changchun,130021)

A series of novel aluminophosphates,named AlPO_4-CJ_n(n=2-5),has been synthesized hydrothermally from R-Al_2O_3-P_2O_5-H_2O systems(R= organic amine molecules),and characterized by means of X-ray powder diffraction,in... 详细信息

关键词： IPO CJ AI SYNTHESIS AND CHARACTERIZATION OF NOVEL MICROPOROUS ALUMINOPHOSPHATES

A STUDY ON DESERTIFICATION OF WEST JILIN PROVINCE BASED ON REMOTE SENSING AND GIS TECHNIQUES

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2002年第1期12卷 73-79页

作者： ZHU Jin hua, LI Jin song(Changchun Institute of Geography, the Chinese Academy of Sciences, Changchun 130021, P.R. China) Changchun Institute of Geography the Chinese Academy of Sciences Changchun P. R. China

'West Jilin Province' in this paper means Zhenlai, Baicheng, Taonan, Da'an,Tongyu, Fuyu, Songyuan, Qian'an, Changling, also includes Gongzhuling, Shuangliao, Lishu, Siping andNong' an which have been suffered from desertification. In west Jilin Province there are three sandzones passing through, they are Xiang (Xianghai) -Wu (Ulan Tug) sand zone, Hai-Feng sand zone, andTao'er River right bank sand zone. The desertification area of west Jilin Province is 819 100 ha,making up 12. 5% of the total land area. Among desertification types, in Jilin Province lightdesertification is the major, then is medium decertification, hevey desertification is the *** to the comparison of the interpretation results of the Landsat images of the 1980s and the1990s by remote sensing and GIS techniques, it can be seen that the desertification area in westJilin Province basically didn't change on the whole, only increased 6130 ha, making up 0. 8% of thedesertification area, change scale is less than 1%. Evidently, desertification is controlled mostly,but some areas are continuing deterioration. The desertification process of China can be dividedinto three types according to origin nature, they are sandy steppe desertification, fixed sandarea(sand land) activation and dunes transfer invasion. Reasons of desertification of West JilinProvince are analyzed, they include natural factors (such as material source factors, chimatefactors) and artificial factors (such as destroying grass to reclaim, steppe decreasing greatly,illegally feeling shelter forest stands, constructing reservoir to influence eco-environment etc. ).Some suggestions are put forward as follows: establishing the social project for ecologicalreconstruction of degenerated land; intensifying planning and management of land use, revertingfarmland into forestland or pasture in a planned way. The key desertification control is to dependmainly on policy and management, then control techniques.

关键词： remote sensing (RS) and GIS techniques desertification west jilin province

The background features of natural environment and the harnessing pattern for the spread of saline land in the Songnen Plain

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 1998年第2期8卷 92-96页

作者： ZHANG BaiChangchun Institute of Geography, CAS, Changchun 130021 CHINA

The Songnen Plain lying in the central part of the Northeast China Plain covers an area of about 170 000 km2. There are vast patches of saline land, which are still in the process of enlargement. The spread of saline land has already caused the worsening of ecoenvironment and hindered agricultural development in the region. The paper analyses background factors of natural environment that caused the spread of saline land according to the information of Landsat TM images. The result shows that among the three kinds of lakes the fault lake is the background factor of natural environment that causes the spread of saline land under arid conditions. Its lakebeach meadows could not recover from the excessive utilization in farming and stockraising. The proposed countermeasures to prevent and control the spread of saline land serve as biological steps or water conservancy facilities to protect the lakebeach meadows of the fault lakes from being artificial excessively utilized.

关键词： spread of saline land background factors natural environment fault lake lakebeach meadow.

WETLAND RESOURCE PROTECTION AND RATIONAL UTILIZATION IN CHINA

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 1996年第4期6卷 313-320页

作者： Lu Xianguo Liu Hongyu Hu Jinming( Changchun Institute of Geography, the Chinese Academy of Sciences,Changchun 130021,PRC) Changchun Institute of Geography the Chinese Academy of Sciences Changchun PRC

ＷＥＴＬＡＮＤ　ＲＥＳＯＵＲＣＥ　ＰＲＯＴＥＣＴＩＯＮ　ＡＮＤ　ＲＡＴＩＯＮＡＬ　ＵＴＩＬＩＺＡＴＩＯＮ　ＩＮ　ＣＨＩＮＡＷＥＴＬＡＮＤＲＥＳＯＵＲＣＥＰＲＯＴＥＣＴＩＯＮＡＮＤＲＡＴＩＯＮＡＬＵＴＩＬＩＺＡＴＩＯＮ... 详细信息

ＷＥＴＬＡＮＤ　ＲＥＳＯＵＲＣＥ　ＰＲＯＴＥＣＴＩＯＮ　ＡＮＤ　ＲＡＴＩＯＮＡＬ　ＵＴＩＬＩＺＡＴＩＯＮ　ＩＮ　ＣＨＩＮＡＷＥＴＬＡＮＤＲＥＳＯＵＲＣＥＰＲＯＴＥＣＴＩＯＮＡＮＤＲＡＴＩＯＮＡＬＵＴＩＬＩＺＡＴＩＯＮＩＮＣＨＩＮＡ￥ＬｕＸｉａｎｇｕｏ...

关键词： wetland resource wetland utilization wetland protection China’s wetlands

Cloning of the full-length gene of activin receptor-interacting protein2a and characterization of its interaction with ActR Ⅱ A

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第2期17卷 172-176页

作者： CUI Xueling, TAI Guixiang, ZHANG Hongjun, FANG Lin and LIU Zhonghui (School of Basic Medical Sciences, Jilin University, Changchun 130021, China) School of Basic Medical Sciences Jilin University Changchun 130021 China

To investigate the mechanism of intracellular signal transduction mediated by activin receptors, the full-length gene encoding a novel activin receptor-interacting protein2a (ARIP2a) was identified from a mouse brain cDNA library. The sequences of ARIP2a and ARIP2, distribution of ARIP2a and ARIP2 mRNA in mouse tissues, and expression of ARIP2a and ARIP2 in activin-induced RAW264.7 cell were compared, and the interaction between ARIP2a and ActRIIA was confirmed. The sequence analysis revealed that the full-length gene of ARIP2a, which composed of 1008 bp and encoded 153 amino acid residues, shared high sequence identity with ARIP2 except the position of the 99th amino acid. RT-PCR assay showed that ARIP2a mRNA was highly expressed in brain, pituitary and testis, and moderately in pancreas and ovary, but undetectable in other tissues. Whereas, ARIP2 mRNA was widely distributed in all mouse tissues that we tested. Moreover, expression of ARIP2a mRNA was significantly decreased in activin-stimulated RAW264. 7 cells; however, the expression of ARIP2 mRNA was increased. Additionally, the interaction between ARIP2a and activin type IIA receptor (ActRIIA) was further demonstrated by mammalian two-hybrid assays and pull-down assays. Taken together, those results indicate that although ARIP2a is homologous to ARIP2, they are different in tissue distribution and responses to activin. ARIP2a could also interact with activin type II receptor as a novel member of ARIP family.

关键词： activin receptor-interacting protein tissue distribution.

SYNTHESIS AND CHARACTERIZATION OF A SERIES OF NOVEL INORGANIC MICROPOROUS CRYSTALS,BePO_4-CIn(n=4-7).

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1991年第1期2卷 67-70页

作者： Long YU Wenqin PANG (Department of Chemistry,Jilin University,Changchun,130021)

A series of novet beryllophosphate zeolites,named BePO_4-CIn(n=4-7), are synthesized hydrothermally and characterized with X-ray powder diffraction,IR spectra,SEM,thermat analysis and ion-exchange.

关键词： n=4-7 CJ SYNTHESIS AND CHARACTERIZATION OF A SERIES OF NOVEL INORGANIC MICROPOROUS CRYSTALS,BePO4-CIn n

Animal Modelling of Lumbar Corpectomy and Fusion and in vivo Growth of Spine Supporting Bone by Titanium Cage Implants: An Experimental Study

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2010年第4期7卷 329-336页

作者： Qingxian Hou,Qingsan Zhu,Yuntao Wu,Ran Li,Dan Li,Yunfeng Zhang,Qing Ruan First Hospital of Jilin University,Changchun 130021,P.R.China First Hospital of Jilin University Changchun P. R. China

In this study a lumbar spinal fusion animal model is established to assess the effect of spinal fusion cage,and explore theminimum area ratio of titanium cage section to vertebral section that ensures bone healing and biomechanical *** was conducted by posterolateral approach with titanium cage implantation combined with plate *** with the same length but different diameters were *** implantation of titanium cages,the progress of bone healingwas observed and the bone biomechanical properties were measured,including deformation and displacement in axial compression,flexion,extension,and lateral bending *** factors affecting the in vivo growth of spine supporting body *** results show that the area ratio of titanium cage section to vertebral section should reach 1/2 to ensure the bonehealing,sufficient bone intensity and biomechanical *** bone healing indicators,such as BMP,suggest that there isa relationship between the peak time and the peak value of bone formation and metabolism markers and the bone healing strength.

关键词： lumbar corpectomy titanium cage implantation spinal fusion biomechanics bone metabolism markers

Shock Waves Increase T-cell Proliferation or IL-2 Expression by Activating p38 MAP Kinase

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2004年第11期36卷 741-748页

作者： Tie-Cheng YU, Yi LIU, Yan TAN, Yanfang JIANG, Xueqing ZHENG, and Xinxiang XUDepartment of Orthopedics, Central Laboratory, and Lithotriptic Center, the First Teaching Hospital of Jilin University, Changchun 130021, China Department of Orthopedics The First Teaching Hospital of Jilin University Changchun 130021 Chin

Shock waves were elicited by transient pressure disturbances, which could be used to treat musculoskeletal disorders. In present studies, we investigated whether the low-density shock waves (LDSWs), which are able to ... 详细信息

关键词： shock waves p38 MAP kinase IL-2 T-cell proliferation