目的:评估褪黑素在再生障碍性贫血(AA)患者中的表达水平及其对免疫功能的影响。方法:用酶联免疫吸附法测定AA患者血浆褪黑素水平,分析褪黑素水平与实验室指标之间的相关性。在体外,用流式细胞术检测褪黑素对AA患者T细胞的活化、增殖和...目的:评估褪黑素在再生障碍性贫血(AA)患者中的表达水平及其对免疫功能的影响。方法:用酶联免疫吸附法测定AA患者血浆褪黑素水平,分析褪黑素水平与实验室指标之间的相关性。在体外,用流式细胞术检测褪黑素对AA患者T细胞的活化、增殖和凋亡水平的影响。结果:AA患者血浆褪黑素水平较正常对照(HC)显著降低(12.23 pg/ml vs 20.04 pg/ml,P<0.01),而强化免疫抑制治疗后(IST)缓解的AA患者血浆褪黑素水平较未缓解患者明显升高(29.16 pg/ml vs 11.73 pg/ml,P=0.04)。AA患者血浆褪黑素水平与血小板(r=0.49)、网织红细胞绝对值(r=0.45)、中性粒细胞百分比(r=0.43)呈明显正相关,而与外周血淋巴细胞百分比(r=-0.45)呈明显负相关。在体外,褪黑素可抑制AA患者CD4+T和CD8+T细胞上CD25和CD69的表达(均P<0.05)。此外,褪黑素可显著抑制AA患者CD4+T和CD8+T细胞的增殖能力(P=0.01,P<0.01)。结论:AA患者血浆褪黑素水平降低,可能在其免疫异常机制中发挥一定的作用。在体外,补充褪黑素可部分纠正AA患者的免疫亢进状态。展开更多
. In this paper, an approach to the design of hemispherical breast RF coil array is proposed. The target field method is applied to find the current density distribution on the hemisphere surface, which induces a homo.... In this paper, an approach to the design of hemispherical breast RF coil array is proposed. The target field method is applied to find the current density distribution on the hemisphere surface, which induces a homogeneous magnetic field in a hemispherical volume. The components of current density are expanded into Fourier series, and the highly ill-conditioned character of the linear equation related to Fourier coefficients is solved using the Tikhonov regularization method with a minimum curvature penalty function. The winding pattern was acquired using the stream function technique. The results indicate that a simple winding pattern with homogeneous magnetic field can be obtained through manually selecting the penalty factor.展开更多
文摘目的:评估褪黑素在再生障碍性贫血(AA)患者中的表达水平及其对免疫功能的影响。方法:用酶联免疫吸附法测定AA患者血浆褪黑素水平,分析褪黑素水平与实验室指标之间的相关性。在体外,用流式细胞术检测褪黑素对AA患者T细胞的活化、增殖和凋亡水平的影响。结果:AA患者血浆褪黑素水平较正常对照(HC)显著降低(12.23 pg/ml vs 20.04 pg/ml,P<0.01),而强化免疫抑制治疗后(IST)缓解的AA患者血浆褪黑素水平较未缓解患者明显升高(29.16 pg/ml vs 11.73 pg/ml,P=0.04)。AA患者血浆褪黑素水平与血小板(r=0.49)、网织红细胞绝对值(r=0.45)、中性粒细胞百分比(r=0.43)呈明显正相关,而与外周血淋巴细胞百分比(r=-0.45)呈明显负相关。在体外,褪黑素可抑制AA患者CD4+T和CD8+T细胞上CD25和CD69的表达(均P<0.05)。此外,褪黑素可显著抑制AA患者CD4+T和CD8+T细胞的增殖能力(P=0.01,P<0.01)。结论:AA患者血浆褪黑素水平降低,可能在其免疫异常机制中发挥一定的作用。在体外,补充褪黑素可部分纠正AA患者的免疫亢进状态。
文摘. In this paper, an approach to the design of hemispherical breast RF coil array is proposed. The target field method is applied to find the current density distribution on the hemisphere surface, which induces a homogeneous magnetic field in a hemispherical volume. The components of current density are expanded into Fourier series, and the highly ill-conditioned character of the linear equation related to Fourier coefficients is solved using the Tikhonov regularization method with a minimum curvature penalty function. The winding pattern was acquired using the stream function technique. The results indicate that a simple winding pattern with homogeneous magnetic field can be obtained through manually selecting the penalty factor.
