目的观察人工全髋关节置换术(Total Hip Replacement,THR)患者自体单采红细胞的效果,为人工全髋关节置换术提供一种更优化更高效的自体备血思路,推动自体单采红细胞技术在外科手术中推广应用。方法选取行单侧人工全髋关节置换术的16例...目的观察人工全髋关节置换术(Total Hip Replacement,THR)患者自体单采红细胞的效果,为人工全髋关节置换术提供一种更优化更高效的自体备血思路,推动自体单采红细胞技术在外科手术中推广应用。方法选取行单侧人工全髋关节置换术的16例患者作为研究对象(单采组),其术前进行自体红细胞单采待术中回输,或根据实际需求又输入异体血;选取同期符合单采自体红细胞条件的,但未进行自体红细胞单采而术中只输异体血的18例患者作为对照(对照组)。记录两组患者单采前或术前血常规主要指标、术中出血量、输异体血情况以及术后第一天的血常规主要指标,并统计学分析。结果单采组患者平均输异体红细胞量为(1.56±1.41)U,对照组为(2.67±1.14)U,差异有统计学意义,其余观察指标两组均无统计学差异。结论单采自体红细胞技术应用于THR作为术前备血,可减少术中异体红细胞输注量,而不引起血常规指标的大幅变化和术中出血量的增加,值得临床推广应用。展开更多
Multiferroic Bi1-xGdxFeO3(x =0, 0.05, 0.1, 0.15, 0.2) ceramics were prepared by conventional solid state reaction method. X-ray diffraction was carried out to characterize the crystal structure and to detect any possi...Multiferroic Bi1-xGdxFeO3(x =0, 0.05, 0.1, 0.15, 0.2) ceramics were prepared by conventional solid state reaction method. X-ray diffraction was carried out to characterize the crystal structure and to detect any possible impurities existing in these ceramics. Frequency dependence of dielectric properties of Bi1-xGdxFeO3 samples at room temperature was measured in a frequency range from 100 Hz to 1 MHz using an HP4294A precision impedance analyzer. For all the samples studied, the dielectric constant and dielectric loss decreases with increasing frequency in the range between 100 Hz and 1 MHz, as can be expected from a typical orientational dielectric relaxation process. There is no indication of any dips over the whole frequency range studied, which is in direct contrast with that reported previously. It is found that both dielectric constant and dielectric loss are strongly dependent on the Gd3+ content. The effect of introducing Gd3+ is to increase the dielectric constant and to decrease the dielectric loss for slightly doped sample Bi0.95Gd0.05FeO3: the dielectric constant of the sample at 1 kHz reaches 600, six times bigger than that for pure BiFeO3. Complicated dielectric behaviors are observed at higher doping levels. Furthermore, the substitution of rare earth Gd for Bi helps to eliminate the impurity phase in BiFeO3 ceramics. There is strong evidence that both lattice constants a and c of the unit cell become smaller as the Gd3 + content is increased. The dielectric constant and loss and their frequency responses can be varied dramatically by substitution of Gd.展开更多
文摘目的观察人工全髋关节置换术(Total Hip Replacement,THR)患者自体单采红细胞的效果,为人工全髋关节置换术提供一种更优化更高效的自体备血思路,推动自体单采红细胞技术在外科手术中推广应用。方法选取行单侧人工全髋关节置换术的16例患者作为研究对象(单采组),其术前进行自体红细胞单采待术中回输,或根据实际需求又输入异体血;选取同期符合单采自体红细胞条件的,但未进行自体红细胞单采而术中只输异体血的18例患者作为对照(对照组)。记录两组患者单采前或术前血常规主要指标、术中出血量、输异体血情况以及术后第一天的血常规主要指标,并统计学分析。结果单采组患者平均输异体红细胞量为(1.56±1.41)U,对照组为(2.67±1.14)U,差异有统计学意义,其余观察指标两组均无统计学差异。结论单采自体红细胞技术应用于THR作为术前备血,可减少术中异体红细胞输注量,而不引起血常规指标的大幅变化和术中出血量的增加,值得临床推广应用。
基金Project supported by the National Natural Science Foundation of China (60571063)Natural Scienc Foundation of Henan Province, China (0611051100) Scientific Research Foundation for the Returned Overseas Chinese Scholars. State Education Ministry
文摘Multiferroic Bi1-xGdxFeO3(x =0, 0.05, 0.1, 0.15, 0.2) ceramics were prepared by conventional solid state reaction method. X-ray diffraction was carried out to characterize the crystal structure and to detect any possible impurities existing in these ceramics. Frequency dependence of dielectric properties of Bi1-xGdxFeO3 samples at room temperature was measured in a frequency range from 100 Hz to 1 MHz using an HP4294A precision impedance analyzer. For all the samples studied, the dielectric constant and dielectric loss decreases with increasing frequency in the range between 100 Hz and 1 MHz, as can be expected from a typical orientational dielectric relaxation process. There is no indication of any dips over the whole frequency range studied, which is in direct contrast with that reported previously. It is found that both dielectric constant and dielectric loss are strongly dependent on the Gd3+ content. The effect of introducing Gd3+ is to increase the dielectric constant and to decrease the dielectric loss for slightly doped sample Bi0.95Gd0.05FeO3: the dielectric constant of the sample at 1 kHz reaches 600, six times bigger than that for pure BiFeO3. Complicated dielectric behaviors are observed at higher doping levels. Furthermore, the substitution of rare earth Gd for Bi helps to eliminate the impurity phase in BiFeO3 ceramics. There is strong evidence that both lattice constants a and c of the unit cell become smaller as the Gd3 + content is increased. The dielectric constant and loss and their frequency responses can be varied dramatically by substitution of Gd.
