目的:探讨CD44+/CD24-/low表型在三阴性乳腺癌(triple-negative breast cancer,TNBC)中的表达情况及其与三阴性乳腺癌的临床病理特征及预后的关系。方法从青岛市中心医疗集团乳腺癌数据库中筛选出2008年1月至2009年12月53例三阴性乳腺...目的:探讨CD44+/CD24-/low表型在三阴性乳腺癌(triple-negative breast cancer,TNBC)中的表达情况及其与三阴性乳腺癌的临床病理特征及预后的关系。方法从青岛市中心医疗集团乳腺癌数据库中筛选出2008年1月至2009年12月53例三阴性乳腺癌病人的石蜡标本,同时随机选取53例同时期相应临床分期的非三阴性乳腺癌(NTNBC)病人的石蜡标本。应用免疫组化技术进行CD44、CD24染色,将CD44+/CD24-/low表型在两组病人中的表达情况进行统计学分析,探讨其与三阴性乳腺癌的临床病理特征及预后的关系。结果 CD44+/CD24-/low(+)在TNBC组中为54.71%,明显高于NTNBC组(45.28)(P<0.05)。在TNBC组,临床病理分期Ⅲ期在 CD44+/CD24-/low(+)中有15例(28.30%),高于CD44+/CD24-/low(-)(9.43%)(P<0.05);局部复发率在CD44+/CD24-/low(+)和CD44+/CD24-/low(-)中分别为24.52%和5.66%(P<0.05);远处转移率分别为16.98%和3.77%(P<0.05)。TNBC组中,CD44+/CD24-/low(+)5年OS(62.00%)、DFS(51.00%)均低于CD44+/CD24-/low(-)5年OS(80.00%)、DFS(75.00%),两组间的差异有统计学意义。结论 CD44+/CD24-/low的高表达可能与三阴性乳腺癌的复发、转移及预后差有相关性。展开更多
We report a low noise continuous-wave （CW） single-frequency 1.5-μm laser source obtained by a singly resonant optical parametric oscillator （SRO） based on periodically poled lithium niobate （PPLN）. The SRO was ...We report a low noise continuous-wave （CW） single-frequency 1.5-μm laser source obtained by a singly resonant optical parametric oscillator （SRO） based on periodically poled lithium niobate （PPLN）. The SRO was pumped by a CW single-frequency Nd：YVO4 laser at 1.06μm. The 1.02 W of CW single-frequency signal laser at 1.5 μm was obtained at pump power of 6 W. At the output power of around 0.75 W, the power stability was better than ±l.5% and no mode-hopping was observed in 30 min and frequency stability was better than 8.5 MHz in 1 min. The signal wavelength could be tuned from 1.57 to 1.59 μm by varying the PPLN temperature. The 1.5-μm laser exhibits low noise characteristics, the intensity noise of the laser reaches the shot noise limit （SNL） at an analysis frequency of 4 MHz and the phase noise is less than 1 dB above the SNL at analysis frequencies above 10 MHz.展开更多
Studies were made of the symmetric tensile-compressive low cycle fatigue behaviour and the influence of dynamic strain aging(DSA)pre-treatment of 18-8 austenitic stainless steel. Within the testing amplitude range of ...Studies were made of the symmetric tensile-compressive low cycle fatigue behaviour and the influence of dynamic strain aging(DSA)pre-treatment of 18-8 austenitic stainless steel. Within the testing amplitude range of strain.±0.5 % to±1.5 %,the three processes of cyclic hardening,cyclic saturation and cyclic softening were observed.In the same amplitude of strain,the peak stress of the samples pre-treated by DSA is higher than that of solid-solu- tion and cold working pre-treatment,but no remarkable differences of the fatigue lives of them were found.TEM observation shows that the uniform and stable dislocation networks with high density form after DSA pre-treatment,which increases the cyclic peak stress.The cyclic softening results from the low dislocation density and elongated cell structure with low energy.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.60878003)the Science Fund for Excellent Research Team of the National Natural Science Foundation of China(Grant No.60821004)the National Basic Research Program of China(Grant No.2010CB923101)
文摘We report a low noise continuous-wave （CW） single-frequency 1.5-μm laser source obtained by a singly resonant optical parametric oscillator （SRO） based on periodically poled lithium niobate （PPLN）. The SRO was pumped by a CW single-frequency Nd：YVO4 laser at 1.06μm. The 1.02 W of CW single-frequency signal laser at 1.5 μm was obtained at pump power of 6 W. At the output power of around 0.75 W, the power stability was better than ±l.5% and no mode-hopping was observed in 30 min and frequency stability was better than 8.5 MHz in 1 min. The signal wavelength could be tuned from 1.57 to 1.59 μm by varying the PPLN temperature. The 1.5-μm laser exhibits low noise characteristics, the intensity noise of the laser reaches the shot noise limit （SNL） at an analysis frequency of 4 MHz and the phase noise is less than 1 dB above the SNL at analysis frequencies above 10 MHz.
文摘Studies were made of the symmetric tensile-compressive low cycle fatigue behaviour and the influence of dynamic strain aging(DSA)pre-treatment of 18-8 austenitic stainless steel. Within the testing amplitude range of strain.±0.5 % to±1.5 %,the three processes of cyclic hardening,cyclic saturation and cyclic softening were observed.In the same amplitude of strain,the peak stress of the samples pre-treated by DSA is higher than that of solid-solu- tion and cold working pre-treatment,but no remarkable differences of the fatigue lives of them were found.TEM observation shows that the uniform and stable dislocation networks with high density form after DSA pre-treatment,which increases the cyclic peak stress.The cyclic softening results from the low dislocation density and elongated cell structure with low energy.
