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spec: Tree ring is a kind of natural archives , on which the isotopic analysis is important to study global climate and environmental change.The authors mainly provide a comprehensive introduction to the fractionation models of carbon , hydrogen and oxygen isotope in plants , their research techniques and the extract methods from cellulose.That results show isotopic tracer can record the message of climatic variation and has become a powerful tool for paleoclimate reconstruction and for the modern environment changing research.Especially studying on PAGES , the cellulose isotopic analyses of imbedded old tree ring have become the mainly quantitative means of environmental evolvement.In addition , China is a typical monsoon country , research in tree ring stable isotope seasonal variation can give us a lot of important information on that.Up to now , the research techniques and works on tree ring in our country are still in its earlier stage , and remain many limitations.It needs further accumulate basic research materials , intensify regional contrast and intercross studies on relative subjects . So , for Saskatchewan , globalization began a long time ago and has become a way of life . Some background on the statutory and regulatory scheme for alien citizen marriage is required to understand the pertinent facts of this case . She sprays contaminated surfaces with a mist of vinegar and then a mist of hydrogen peroxide . If a kill command is separated from the last kill command by other commands ( not just numeric arguments ) , it starts a new entry on the kill ring . The duty of a valiant woman , a courageous man , is to hold firm . And they know fully well that apart from moral support , there is little that India can offer , because in almost all matters , India herself now needs US help and has become a US underling . From an ahead-of-its-time conference in the mid - 80s , we developed a comprehensive , campus-wide AIDS effort , which continues to this day and has become a national model .