提出了电感耦合等离子体原子发射光谱法(ICP-AES)测定核级316不锈钢中痕量铈的方法。取0.100 0 g样品于烧杯中,加入15 m L现配体积比为1∶3∶4的硝酸-盐酸-水混酸溶液,置于150℃电热板上消解30 min,完全溶解后加入5 m L 30%(质量分数)...提出了电感耦合等离子体原子发射光谱法(ICP-AES)测定核级316不锈钢中痕量铈的方法。取0.100 0 g样品于烧杯中,加入15 m L现配体积比为1∶3∶4的硝酸-盐酸-水混酸溶液,置于150℃电热板上消解30 min,完全溶解后加入5 m L 30%(质量分数)过氧化氢溶液,恒温3 min后取下冷却至室温,用水定容至100 m L。设置仪器射频功率为1 150 W,雾化气流量为0.45 L·min^(-1),测量铈元素在404.076 nm分析谱线处的响应强度,基质匹配法定量。结果表明:铈的质量浓度在100 mg·L^(-1)以内与对应的响应强度呈线性关系,检出限(3s)为0.000 4%。4个样品精密度试验所得测定值的相对标准偏差(n=10)均小于5.0%。按照标准加入法进行回收试验,回收率为95.5%~103%;采用GH56(屑样)铁镍基标准物质进行准确度验证,测定值与认定值基本一致。展开更多
Through advances in technology,the genetic basis of cancer has been investigated at the genomic level,and many fundamental questions have begun to be addressed.Among several key unresolved questions in cancer biology,...Through advances in technology,the genetic basis of cancer has been investigated at the genomic level,and many fundamental questions have begun to be addressed.Among several key unresolved questions in cancer biology,the molecular basis for the link between nuclear deformation and malignancy has not been determined.Another hallmark of human cancer is aneuploidy;however,the causes and consequences of aneuploidy are unanswered and are hotly contested topics.We found that nuclear lamina proteins lamin A/C are absent in a significant fraction(38%) of human breast cancer tissues.Even in lamin A/C-positive breast cancer,lamin A/C expression is heterogeneous or aberrant(such as non-nuclear distribution) in the population of tumor cells,as determined by immunohistology and immunofluorescence microscopy.In most breast cancer cell lines,a significant fraction of the lamin A/C-negative population was observed.To determine the consequences of the loss of lamin A/C,we suppressed their expression by shRNA in noncancerous primary breast epithelial cells.Down-regulation of lamin A/C in breast epithelial cells led to morphological deformation,resembling that of cancer cells,as observed by immunofluorescence microscopy.The lamin A/C-suppressed breast epithelial cells developed aneuploidy as determined by both flow cytometry and fluorescence in situ hybridization.We conclude that the loss of nuclear envelope structural proteins lamin A/C in breast cancer underlies the two hallmarks of cancer aberrations in nuclear morphology and aneuploidy.展开更多
Both proliferating cell nuclear antigen and P27 protein are important factors to regulate cell cycle. While, the combination of them can provide exactly objective markers to evaluate prognosis of patients with brain g...Both proliferating cell nuclear antigen and P27 protein are important factors to regulate cell cycle. While, the combination of them can provide exactly objective markers to evaluate prognosis of patients with brain glioma needs to be further studied based on pathological level. OBJECTIVE： To observe the expressions of proliferating cell nuclear antigen and P27 protein in both injured and normal brain glioma tissues and analyze the effect of them on onset and development of brain glioma. DESIGN： Case contrast observation. SETTING： Department of Neurosurgery, the Second Affiliated Hospital of Xi＇an Jiaotong University. PARTICIPANTS： A total of 63 patients with brain glioma were selected from Department of Neurosurgery, the Second Affiliated Hospital of Xi＇an Jiaotong University from July 1996 to June 2000. There were 38 males and 25 females and their ages ranged from 23 to 71 years. Based on pathological classification and grading standards of brain glioma, patients were divided into grade I - II （n=30） and grade III- IV （n = 33）. All cases received one operation but no radiotherapy and chemiotherapy before operation. Sample tissues were collected from tumor parenchyma. Non-neoplastic brain tissues were collected from another 12 non-tumor subjects who received craniocerebral trauma infra-decompression and regarded as the control group. There were l0 males and 2 females and their ages ranged from 16 to 54 years. The experiment had got confirmed consent from local ethic committee and the collection was provided confirmed consent from patients and their relatives. All samples were restained with HE staining so as to diagnose as the brain glioma. While, all patients with brain glioma received radiotherapy after operation and their survival periods were followed up. METHODS： Primary lesion wax of brain glioma was cut into serial sections and stained with S-P immunohistochemical staining. Brown substance which was observed in tumor nucleus was regarded as the positive expressions of both proliferating cell nuclear antigen and P27 protein. Automatic imaging analytic system was used to quantitatively analyze staining results of tumor. MAIN OUTCOME MEASURES： To compare the expressions of proliferating cell nuclear antigen and P27 protein in brain glioma tissues and non-tumor brain tissues and investigate the effect of various sexes, ages, survival periods and severities on the expressions of them in brain tissues. RESULTS： There was no significant difference of sexes and ages in the expressions of proliferating cell nuclear antigen and P27 protein （P 〉 0.05）; however, the expressions of proliferating cell nuclear antigen and P27 protein were milder in non-tumor brain tissues than those in the brain glioma tissues （P 〈 0.05）. Expression of proliferating cell nuclear antigen in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods （P 〈 0.05）. In addition, expression of P27 protein in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods （P 〈 0.05）. CONCLUSION： Abnormal expressions of proliferating cell nuclear antigen and P27 protein in human brain glioma are closely related to onset, development and prognosis of tumor.展开更多
目的:探索常规超声及超声造影(contrast-enhanced ultrasound,CEUS)声像图表现对高级别乳腺导管原位癌(ductal carcinoma in situ,DCIS)的独立预测因素及预测价值。方法:回顾并分析2018年1月—2021年12月诊断为DCIS患者的临床及影像学...目的:探索常规超声及超声造影(contrast-enhanced ultrasound,CEUS)声像图表现对高级别乳腺导管原位癌(ductal carcinoma in situ,DCIS)的独立预测因素及预测价值。方法:回顾并分析2018年1月—2021年12月诊断为DCIS患者的临床及影像学资料。纳入患者均行手术后病理学检查,并有明确的核分级结果。纳入患者均具备术前1个月内完善且质量良好的常规超声和CEUS图像资料,以多因素logistic回归分析常规超声和CEUS上独立预测因素并计算预测效能。结果:最终94个单纯DCIS病变纳入研究,包括低级别23例、中级别41例及高级别30例。将中、低级别归为一组,高级别归为另一组,两组间患者年龄、病灶最大径、症状及淋巴结转移情况组间差异无统计学意义。常规超声上病变形态分类(即肿块样和非肿块样)及是否伴发微钙化组间差异均有统计学意义(P<0.05),且微钙化为独立预测风险因素,其似然比(odd ratio,OR)为3.071,曲线下面积(area under curve,AUC)为0.636(P=0.014)。在CEUS上,增强均匀性、病变边缘存在放射状血管及增强后范围增大征象组间差异均有统计学意义(P<0.05),其中,边缘放射状血管征象为独立预测因素,OR和AUC分别为3.319和0.640(P=0.013)。常规超声及CEUS两种模态联合预测高级别DCIS的灵敏度、特异度及AUC分别为46.7%,90.6%及0.686,联合后的特异度较单独常规超声或CEUS模态明显提升(P<0.05)。结论:常规超声及CEUS声像图表现均有助于预测高级别DCIS,其中,常规超声的微钙化表现及CEUS的病变边缘放射状血管征象为独立预测因素,两者联合较单独模态可显著提高预测特异度。展开更多
文摘提出了电感耦合等离子体原子发射光谱法(ICP-AES)测定核级316不锈钢中痕量铈的方法。取0.100 0 g样品于烧杯中,加入15 m L现配体积比为1∶3∶4的硝酸-盐酸-水混酸溶液,置于150℃电热板上消解30 min,完全溶解后加入5 m L 30%(质量分数)过氧化氢溶液,恒温3 min后取下冷却至室温,用水定容至100 m L。设置仪器射频功率为1 150 W,雾化气流量为0.45 L·min^(-1),测量铈元素在404.076 nm分析谱线处的响应强度,基质匹配法定量。结果表明:铈的质量浓度在100 mg·L^(-1)以内与对应的响应强度呈线性关系,检出限(3s)为0.000 4%。4个样品精密度试验所得测定值的相对标准偏差(n=10)均小于5.0%。按照标准加入法进行回收试验,回收率为95.5%~103%;采用GH56(屑样)铁镍基标准物质进行准确度验证,测定值与认定值基本一致。
基金supported by funds from concept awards BC097189 and BC076832 from Department of Defense(USA)Grants R01CA095071,R01CA099471,and CA79716to Xiang-Xi Xu from NCI
文摘Through advances in technology,the genetic basis of cancer has been investigated at the genomic level,and many fundamental questions have begun to be addressed.Among several key unresolved questions in cancer biology,the molecular basis for the link between nuclear deformation and malignancy has not been determined.Another hallmark of human cancer is aneuploidy;however,the causes and consequences of aneuploidy are unanswered and are hotly contested topics.We found that nuclear lamina proteins lamin A/C are absent in a significant fraction(38%) of human breast cancer tissues.Even in lamin A/C-positive breast cancer,lamin A/C expression is heterogeneous or aberrant(such as non-nuclear distribution) in the population of tumor cells,as determined by immunohistology and immunofluorescence microscopy.In most breast cancer cell lines,a significant fraction of the lamin A/C-negative population was observed.To determine the consequences of the loss of lamin A/C,we suppressed their expression by shRNA in noncancerous primary breast epithelial cells.Down-regulation of lamin A/C in breast epithelial cells led to morphological deformation,resembling that of cancer cells,as observed by immunofluorescence microscopy.The lamin A/C-suppressed breast epithelial cells developed aneuploidy as determined by both flow cytometry and fluorescence in situ hybridization.We conclude that the loss of nuclear envelope structural proteins lamin A/C in breast cancer underlies the two hallmarks of cancer aberrations in nuclear morphology and aneuploidy.
文摘Both proliferating cell nuclear antigen and P27 protein are important factors to regulate cell cycle. While, the combination of them can provide exactly objective markers to evaluate prognosis of patients with brain glioma needs to be further studied based on pathological level. OBJECTIVE： To observe the expressions of proliferating cell nuclear antigen and P27 protein in both injured and normal brain glioma tissues and analyze the effect of them on onset and development of brain glioma. DESIGN： Case contrast observation. SETTING： Department of Neurosurgery, the Second Affiliated Hospital of Xi＇an Jiaotong University. PARTICIPANTS： A total of 63 patients with brain glioma were selected from Department of Neurosurgery, the Second Affiliated Hospital of Xi＇an Jiaotong University from July 1996 to June 2000. There were 38 males and 25 females and their ages ranged from 23 to 71 years. Based on pathological classification and grading standards of brain glioma, patients were divided into grade I - II （n=30） and grade III- IV （n = 33）. All cases received one operation but no radiotherapy and chemiotherapy before operation. Sample tissues were collected from tumor parenchyma. Non-neoplastic brain tissues were collected from another 12 non-tumor subjects who received craniocerebral trauma infra-decompression and regarded as the control group. There were l0 males and 2 females and their ages ranged from 16 to 54 years. The experiment had got confirmed consent from local ethic committee and the collection was provided confirmed consent from patients and their relatives. All samples were restained with HE staining so as to diagnose as the brain glioma. While, all patients with brain glioma received radiotherapy after operation and their survival periods were followed up. METHODS： Primary lesion wax of brain glioma was cut into serial sections and stained with S-P immunohistochemical staining. Brown substance which was observed in tumor nucleus was regarded as the positive expressions of both proliferating cell nuclear antigen and P27 protein. Automatic imaging analytic system was used to quantitatively analyze staining results of tumor. MAIN OUTCOME MEASURES： To compare the expressions of proliferating cell nuclear antigen and P27 protein in brain glioma tissues and non-tumor brain tissues and investigate the effect of various sexes, ages, survival periods and severities on the expressions of them in brain tissues. RESULTS： There was no significant difference of sexes and ages in the expressions of proliferating cell nuclear antigen and P27 protein （P 〉 0.05）; however, the expressions of proliferating cell nuclear antigen and P27 protein were milder in non-tumor brain tissues than those in the brain glioma tissues （P 〈 0.05）. Expression of proliferating cell nuclear antigen in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods （P 〈 0.05）. In addition, expression of P27 protein in brain tissue of grade III- IV severity was stronger than that of grade I - II severity, and the expression in ≥ 5-year survival periods were also stronger than that in 〈 5-year survival periods （P 〈 0.05）. CONCLUSION： Abnormal expressions of proliferating cell nuclear antigen and P27 protein in human brain glioma are closely related to onset, development and prognosis of tumor.
文摘目的:探索常规超声及超声造影(contrast-enhanced ultrasound,CEUS)声像图表现对高级别乳腺导管原位癌(ductal carcinoma in situ,DCIS)的独立预测因素及预测价值。方法:回顾并分析2018年1月—2021年12月诊断为DCIS患者的临床及影像学资料。纳入患者均行手术后病理学检查,并有明确的核分级结果。纳入患者均具备术前1个月内完善且质量良好的常规超声和CEUS图像资料,以多因素logistic回归分析常规超声和CEUS上独立预测因素并计算预测效能。结果:最终94个单纯DCIS病变纳入研究,包括低级别23例、中级别41例及高级别30例。将中、低级别归为一组,高级别归为另一组,两组间患者年龄、病灶最大径、症状及淋巴结转移情况组间差异无统计学意义。常规超声上病变形态分类(即肿块样和非肿块样)及是否伴发微钙化组间差异均有统计学意义(P<0.05),且微钙化为独立预测风险因素,其似然比(odd ratio,OR)为3.071,曲线下面积(area under curve,AUC)为0.636(P=0.014)。在CEUS上,增强均匀性、病变边缘存在放射状血管及增强后范围增大征象组间差异均有统计学意义(P<0.05),其中,边缘放射状血管征象为独立预测因素,OR和AUC分别为3.319和0.640(P=0.013)。常规超声及CEUS两种模态联合预测高级别DCIS的灵敏度、特异度及AUC分别为46.7%,90.6%及0.686,联合后的特异度较单独常规超声或CEUS模态明显提升(P<0.05)。结论:常规超声及CEUS声像图表现均有助于预测高级别DCIS,其中,常规超声的微钙化表现及CEUS的病变边缘放射状血管征象为独立预测因素,两者联合较单独模态可显著提高预测特异度。
