Dating data, altitude of Neolithic sites, climatic changes from sedimentary records and previous research results were collected and analyzed to detect possible connections between climatic changes and human activitie...Dating data, altitude of Neolithic sites, climatic changes from sedimentary records and previous research results were collected and analyzed to detect possible connections between climatic changes and human activities in the Changjiang River Delta in the Neolithic Age. The results indicated that hydrological changes greatly impacted the human activities in the study region. Low-lying geomorphology made the floods and sea level changes become the important factors affecting human activities, especially the altitude change of human settlements. People usually moved to higher places during the periods characterized by high sea level and frequent floods to escape the negative influences from water body expansion, which resulted in cultural hiatus in certain profiles. However, some higher-altitude settlements were not the results of climatic changes but the results of social factors, such as religious ceremony and social status. Therefore, further research will be necessary for the degree and types of impacts of climatic changes on human activities in the study area at that time.展开更多
The temporal-spatial distribution of Neolithicsites shows a long period of absence of human settlementsduring the early Holocene on the Yangtze Delta, and the area has not been colonized until 7000 aBP, corresponding ...The temporal-spatial distribution of Neolithicsites shows a long period of absence of human settlementsduring the early Holocene on the Yangtze Delta, and the area has not been colonized until 7000 aBP, corresponding to the onset of the Majiabang culture. Besides the regions east to the sandbar of Maqiao Site in Shanghai, foraminifera are not found in Neolithic cultural layers since 7000 aBP, indicating a widespread transgression between 10000 and 7000 aBP.Evidence of radiocarbon-dated cultural relics, foraminifera and pollen records from the Hemudu Site suggests that the Hemudu culture emerged and developed during themid-Holocene Climatic Optimum. Therefore, the hypothesisof a mid-Holocene sea-level highstand along the YangtzeDelta and Ningshao Plain from 7000 to 5000 aBP is an open debate. New evidence from archaeological excavations andbio-stratigraphy suggests that, prior to 7000 aBP, a high sea level occurred along the Ningshao Plain. Subsequently, the sea level was lowered between 7000 and 5000 aBP, and the area suffered from frequent floods from 5000 to 3900 aBP.展开更多
As a homodimeric glycoprotein, vascular en- dothelial growth factor (VEGF) is a highly specific mitogen of vascular endothelial cells. It can induce proliferation and migration, and inhibit apoptosis of endothelial ce...As a homodimeric glycoprotein, vascular en- dothelial growth factor (VEGF) is a highly specific mitogen of vascular endothelial cells. It can induce proliferation and migration, and inhibit apoptosis of endothelial cell. VEGF is involved in many processes in the female reproductive sys-tem, such as ovulation, periodical changes of endometrium, embryo implantation and development. VEGF plays impor-tant roles in some reproductive diseases, including pree-clampsia and fetal hypoevolutism in uterus. Based on our studies on angiogenesis and its relevant factors in the female reproductive system these years, the functions of VEGF in female reproductive system are reviewed, and the research prospect and application of VEGF are also discussed.展开更多
基金Under the auspices of K. C. WANG Education Foundation Hong Kong+1 种基金 the National Postdoctoral Foundation of China and Key Project of Chinese Academy of Sciences (No. KZCX3-SW-331)
文摘Dating data, altitude of Neolithic sites, climatic changes from sedimentary records and previous research results were collected and analyzed to detect possible connections between climatic changes and human activities in the Changjiang River Delta in the Neolithic Age. The results indicated that hydrological changes greatly impacted the human activities in the study region. Low-lying geomorphology made the floods and sea level changes become the important factors affecting human activities, especially the altitude change of human settlements. People usually moved to higher places during the periods characterized by high sea level and frequent floods to escape the negative influences from water body expansion, which resulted in cultural hiatus in certain profiles. However, some higher-altitude settlements were not the results of climatic changes but the results of social factors, such as religious ceremony and social status. Therefore, further research will be necessary for the degree and types of impacts of climatic changes on human activities in the study area at that time.
基金supported by the National Natural Science Foundation of China(Grant Nos.40271103 and 40071083)the University Doctoral Foundation(Grant No.2000028414)the Physical Geography of“985”Items and the Test Foundation of Nanjing University.
文摘The temporal-spatial distribution of Neolithicsites shows a long period of absence of human settlementsduring the early Holocene on the Yangtze Delta, and the area has not been colonized until 7000 aBP, corresponding to the onset of the Majiabang culture. Besides the regions east to the sandbar of Maqiao Site in Shanghai, foraminifera are not found in Neolithic cultural layers since 7000 aBP, indicating a widespread transgression between 10000 and 7000 aBP.Evidence of radiocarbon-dated cultural relics, foraminifera and pollen records from the Hemudu Site suggests that the Hemudu culture emerged and developed during themid-Holocene Climatic Optimum. Therefore, the hypothesisof a mid-Holocene sea-level highstand along the YangtzeDelta and Ningshao Plain from 7000 to 5000 aBP is an open debate. New evidence from archaeological excavations andbio-stratigraphy suggests that, prior to 7000 aBP, a high sea level occurred along the Ningshao Plain. Subsequently, the sea level was lowered between 7000 and 5000 aBP, and the area suffered from frequent floods from 5000 to 3900 aBP.
基金supported by the State Key Basic Research Project(Grant No.1999055903)2002 CAS Knowledge Innovation Progress.
文摘As a homodimeric glycoprotein, vascular en- dothelial growth factor (VEGF) is a highly specific mitogen of vascular endothelial cells. It can induce proliferation and migration, and inhibit apoptosis of endothelial cell. VEGF is involved in many processes in the female reproductive sys-tem, such as ovulation, periodical changes of endometrium, embryo implantation and development. VEGF plays impor-tant roles in some reproductive diseases, including pree-clampsia and fetal hypoevolutism in uterus. Based on our studies on angiogenesis and its relevant factors in the female reproductive system these years, the functions of VEGF in female reproductive system are reviewed, and the research prospect and application of VEGF are also discussed.
