In the past 20 a, the gulf-scale circulation in the Beibu Gulf has been commonly accepted to be driven by a wind stress or density gradient. However, using three sensitive experiments based on a three-dimensional baro...In the past 20 a, the gulf-scale circulation in the Beibu Gulf has been commonly accepted to be driven by a wind stress or density gradient. However, using three sensitive experiments based on a three-dimensional baroclinic model that was verified by observations, the formation mechanisms were revealed： the circula- tion in the northern Beibu Gulf was triggered by the monsoon wind throughout a year; whereas the southern gulf circulation was driven by the monsoon wind and South China Sea （SCS） circulation in winter and sum- mer, respectively. The force of heat flux and tidal harmonics had a strong effect on the circulation strength and range, as well as the local circulation structures, but these factors did not influence the major circulation structure in the Beibu Gulf. On the other hand, the Beibu Gulf Cold Water Mass （BGCWM） would disappear without the force of heat flux because the seasonal thermocline layer was generated by the input of heat so that the vertical mixing between the upper hot water and lower cold water was blocked. In addition, the wind-induced cyclonic gyre in the northern gulf was favorable to the existence of the BGCWM. However, the coverage area of the BGCWM was increased slightly without the force of the tidal harmonics. When the model was driven by the monthly averaged surface forcing, the circulation structure was changed to some extent, and the coverage area of the BGCWM almost extended outwards 100%, implying the circulation and water mass in the Beibu Gulf had strong responses to the temporal resolution of the surface forces.展开更多
背景:股骨头坏死机制目前虽然有糖皮质激素、乙醇、减压病、镰刀细胞性贫血、基因易感性等一系列解释学说,但具体的发病机制仍不明确。目的:结合近期的遗传基因学研究,着重对非创伤性股骨头坏死的相关基因加以综述,目的是为股骨头修复...背景:股骨头坏死机制目前虽然有糖皮质激素、乙醇、减压病、镰刀细胞性贫血、基因易感性等一系列解释学说,但具体的发病机制仍不明确。目的:结合近期的遗传基因学研究,着重对非创伤性股骨头坏死的相关基因加以综述,目的是为股骨头修复及重塑提供新的治疗途径。方法:应用计算机检索中国知网数据库、万方数据库、PubMed数据库及Web of Science数据库收录的相关文献,以"非创伤性股骨头坏死,易感基因,发病机制"作为中文检索词,以"non-traumaticoste onecrosis of the femoral head,susceptible genes,pathogenesis"作为英文检索词进行检索,纳入文献日期为2000年1月至2019年4月。根据纳入标准和排除标准,排除了与文献主题不相关和重复研究的文献,最终纳入49篇文献进行综述。结果与结论:非创伤性股骨头坏死是一种极其复杂的疾病,其发病机制受到多种因素的相互作用,而非单一的遗传基因所导致。近年研究显示,COL2A1基因突变仍是与非创伤性股骨头坏死关联性最强的易感基因,而血液中的高凝与低纤溶状态相关基因位点、免疫中的白细胞介素因子相关基因位点与脂类代谢相关位点在诱导非创伤性股骨头坏死中变得越来越重要。随着人类对基因技术方面更加深入的了解,会不断提高检测易感基因的准确性,有利于非创伤性股骨头坏死的预防、诊断与个体临床化精准治疗。展开更多
基金The Guangxi Natural Science Foundation under contract No.2012GXNSFEA053001the program of"The Beibu Gulf forecast circulation system construction and its application to the coastal pollution transport"
文摘In the past 20 a, the gulf-scale circulation in the Beibu Gulf has been commonly accepted to be driven by a wind stress or density gradient. However, using three sensitive experiments based on a three-dimensional baroclinic model that was verified by observations, the formation mechanisms were revealed： the circula- tion in the northern Beibu Gulf was triggered by the monsoon wind throughout a year; whereas the southern gulf circulation was driven by the monsoon wind and South China Sea （SCS） circulation in winter and sum- mer, respectively. The force of heat flux and tidal harmonics had a strong effect on the circulation strength and range, as well as the local circulation structures, but these factors did not influence the major circulation structure in the Beibu Gulf. On the other hand, the Beibu Gulf Cold Water Mass （BGCWM） would disappear without the force of heat flux because the seasonal thermocline layer was generated by the input of heat so that the vertical mixing between the upper hot water and lower cold water was blocked. In addition, the wind-induced cyclonic gyre in the northern gulf was favorable to the existence of the BGCWM. However, the coverage area of the BGCWM was increased slightly without the force of the tidal harmonics. When the model was driven by the monthly averaged surface forcing, the circulation structure was changed to some extent, and the coverage area of the BGCWM almost extended outwards 100%, implying the circulation and water mass in the Beibu Gulf had strong responses to the temporal resolution of the surface forces.
文摘背景:股骨头坏死机制目前虽然有糖皮质激素、乙醇、减压病、镰刀细胞性贫血、基因易感性等一系列解释学说,但具体的发病机制仍不明确。目的:结合近期的遗传基因学研究,着重对非创伤性股骨头坏死的相关基因加以综述,目的是为股骨头修复及重塑提供新的治疗途径。方法:应用计算机检索中国知网数据库、万方数据库、PubMed数据库及Web of Science数据库收录的相关文献,以"非创伤性股骨头坏死,易感基因,发病机制"作为中文检索词,以"non-traumaticoste onecrosis of the femoral head,susceptible genes,pathogenesis"作为英文检索词进行检索,纳入文献日期为2000年1月至2019年4月。根据纳入标准和排除标准,排除了与文献主题不相关和重复研究的文献,最终纳入49篇文献进行综述。结果与结论:非创伤性股骨头坏死是一种极其复杂的疾病,其发病机制受到多种因素的相互作用,而非单一的遗传基因所导致。近年研究显示,COL2A1基因突变仍是与非创伤性股骨头坏死关联性最强的易感基因,而血液中的高凝与低纤溶状态相关基因位点、免疫中的白细胞介素因子相关基因位点与脂类代谢相关位点在诱导非创伤性股骨头坏死中变得越来越重要。随着人类对基因技术方面更加深入的了解,会不断提高检测易感基因的准确性,有利于非创伤性股骨头坏死的预防、诊断与个体临床化精准治疗。
