应用美国LECO公司TCH600氧氮氢分析仪对WC-Ni_3Al中氧的测定条件进行试验和研究。试验结果表明,选择石墨套坩埚、分析功率4.0 k W、分析积分时间40 s为最佳测定条件。在优化条件下建立氧校正曲线,线性好,相关系数大于0.9990。测定氧含量...应用美国LECO公司TCH600氧氮氢分析仪对WC-Ni_3Al中氧的测定条件进行试验和研究。试验结果表明,选择石墨套坩埚、分析功率4.0 k W、分析积分时间40 s为最佳测定条件。在优化条件下建立氧校正曲线,线性好,相关系数大于0.9990。测定氧含量为0.15%的样品,相对标准偏差(RSD,n=11)为1.9%,完全满足生产和科研的需要。展开更多
Objective: To study the value of combined determination of carcinoembryonic antigen (CEA), total cholesterol (Tch) and adenosine deaminase (ADA) in the differential diagnosis of ascites due to different causes. Method...Objective: To study the value of combined determination of carcinoembryonic antigen (CEA), total cholesterol (Tch) and adenosine deaminase (ADA) in the differential diagnosis of ascites due to different causes. Methods: Sixty-eight cases with ascites were divided into 3 groups based on their etiology, namely malignant ascites, tubercular ascites and non-tubercular benign ascites. CEA, Tch, and ADA were measured and analyzed in different ascites. Results: CEA was significantly higher in malignant ascites than in benign ascites, the sensitivity and specificity for malignant ascites being 50% and 100% respectively. Tch is higher or equal to 1.54 mmol/L in tubercular ascites and lower or equal to 1.18 mmol/L in non-tubercular benign ascites, and Tch level in malignant ascites was frequently between that in tubercular acites and non-tubercular benign ascites. Ascitic fluid ADA activity was higher than 30 U/L in 80% of tubercular ascites, while none of non-tubercular benign ascites reached to such level. Conclusion: CEA, Tch and ADA are valuable for the diagnosis and differential diagnosis of ascitic etiology and combine measurements of these indices can increase the diagnostic efficiency.展开更多
文摘应用美国LECO公司TCH600氧氮氢分析仪对WC-Ni_3Al中氧的测定条件进行试验和研究。试验结果表明,选择石墨套坩埚、分析功率4.0 k W、分析积分时间40 s为最佳测定条件。在优化条件下建立氧校正曲线,线性好,相关系数大于0.9990。测定氧含量为0.15%的样品,相对标准偏差(RSD,n=11)为1.9%,完全满足生产和科研的需要。
文摘Objective: To study the value of combined determination of carcinoembryonic antigen (CEA), total cholesterol (Tch) and adenosine deaminase (ADA) in the differential diagnosis of ascites due to different causes. Methods: Sixty-eight cases with ascites were divided into 3 groups based on their etiology, namely malignant ascites, tubercular ascites and non-tubercular benign ascites. CEA, Tch, and ADA were measured and analyzed in different ascites. Results: CEA was significantly higher in malignant ascites than in benign ascites, the sensitivity and specificity for malignant ascites being 50% and 100% respectively. Tch is higher or equal to 1.54 mmol/L in tubercular ascites and lower or equal to 1.18 mmol/L in non-tubercular benign ascites, and Tch level in malignant ascites was frequently between that in tubercular acites and non-tubercular benign ascites. Ascitic fluid ADA activity was higher than 30 U/L in 80% of tubercular ascites, while none of non-tubercular benign ascites reached to such level. Conclusion: CEA, Tch and ADA are valuable for the diagnosis and differential diagnosis of ascitic etiology and combine measurements of these indices can increase the diagnostic efficiency.
