When water environmental carrying capacity of public resource tourist attraction is studied, the two action subjects of tourists and local residents should be discussed, and comprehensive consideration must be given t...When water environmental carrying capacity of public resource tourist attraction is studied, the two action subjects of tourists and local residents should be discussed, and comprehensive consideration must be given to the influence of these two on water environment. On the basis of water resource carrying capacity and water quality carrying capacity, water environmental carrying capacity index of public resource tourist attraction was constructed, the model for the water environmental carrying capacity of public resource tourist attraction was established on the basis of matter-element model and analytical hierarchy process. By applying this method, water environmental carrying capacity situation of a certain public resource tourist attraction can be gained, moreover, situations about several aspects of water environmental carrying capacity can be evaluated.展开更多
脊柱融合是脊柱外科中最常用的手术方式之一,在术中选择合适的植骨材料具有十分重要的意义。一种良好的骨移植材料需同时具备骨传导性、骨诱导性和成骨性三大特性。目前,临床上应用最广泛的骨移植材料为同种异体骨,包括新鲜冰冻骨、冻...脊柱融合是脊柱外科中最常用的手术方式之一,在术中选择合适的植骨材料具有十分重要的意义。一种良好的骨移植材料需同时具备骨传导性、骨诱导性和成骨性三大特性。目前,临床上应用最广泛的骨移植材料为同种异体骨,包括新鲜冰冻骨、冻干骨和脱钙骨基质(demineralized bone matrix,DBM)三类,新鲜冰冻骨具有最高的机械稳定性,但存在免疫反应和疾病传播的危险性;冻干骨在其制备过程中,水分的丢失和辐照的电离破坏了其力学性能;DBM是一种由胶原蛋白(主要为Ⅰ型、Ⅳ型)、非胶原蛋白、生长因子、少量磷酸钙和细胞碎片等组成的天然骨移植材料,具有良好的骨诱导性及一定的骨传导性。目前,随着骨移植替代材料研究深入,DBM显示出了相当大的优势,同时在脊柱融合中发挥了重要作用。展开更多
文摘When water environmental carrying capacity of public resource tourist attraction is studied, the two action subjects of tourists and local residents should be discussed, and comprehensive consideration must be given to the influence of these two on water environment. On the basis of water resource carrying capacity and water quality carrying capacity, water environmental carrying capacity index of public resource tourist attraction was constructed, the model for the water environmental carrying capacity of public resource tourist attraction was established on the basis of matter-element model and analytical hierarchy process. By applying this method, water environmental carrying capacity situation of a certain public resource tourist attraction can be gained, moreover, situations about several aspects of water environmental carrying capacity can be evaluated.
文摘脊柱融合是脊柱外科中最常用的手术方式之一,在术中选择合适的植骨材料具有十分重要的意义。一种良好的骨移植材料需同时具备骨传导性、骨诱导性和成骨性三大特性。目前,临床上应用最广泛的骨移植材料为同种异体骨,包括新鲜冰冻骨、冻干骨和脱钙骨基质(demineralized bone matrix,DBM)三类,新鲜冰冻骨具有最高的机械稳定性,但存在免疫反应和疾病传播的危险性;冻干骨在其制备过程中,水分的丢失和辐照的电离破坏了其力学性能;DBM是一种由胶原蛋白(主要为Ⅰ型、Ⅳ型)、非胶原蛋白、生长因子、少量磷酸钙和细胞碎片等组成的天然骨移植材料,具有良好的骨诱导性及一定的骨传导性。目前,随着骨移植替代材料研究深入,DBM显示出了相当大的优势,同时在脊柱融合中发挥了重要作用。