目的研究衣被蛋白复合物亚基β-2(coatomer protein complex subunitβ2,COPB2)的表达对膀胱癌发病的影响,探讨COPB2在膀胱癌中的分子作用机制。方法从癌症基因组图谱(the cancer genome atlas,TCGA)数据库下载膀胱癌中COPB2的相关数据...目的研究衣被蛋白复合物亚基β-2(coatomer protein complex subunitβ2,COPB2)的表达对膀胱癌发病的影响,探讨COPB2在膀胱癌中的分子作用机制。方法从癌症基因组图谱(the cancer genome atlas,TCGA)数据库下载膀胱癌中COPB2的相关数据,探究COPB2的表达水平与预后关系。根据膀胱癌不同分期将样本进行分组。使用Kaplan-Meier法对不同组别间的生存情况进行分析。使用COPB2-shRNA慢病毒和阴性对照慢病毒感染5637细胞(人膀胱癌细胞),RT-qPCR和蛋白印迹检测细胞中COPB2表达变化。使用平板克隆实验评估细胞的增殖能力。对细胞中p27 kip1、半胱天冬酶-3和多腺苷二磷酸多聚酶的表达水平进行蛋白印迹检测。检测细胞中与上皮-间充质转化(epithelial-to-mesenchymal transition,EMT)相关的N-钙黏蛋白和Snail的表达水平。结果肿瘤免疫浸润评分数据库(tumor immune estimation resource,TIMER)显示,相比于正常膀胱,COPB2在膀胱癌中过表达。COPB2表达水平越高,患者预后越差(P<0.05)。COPB2敲低后膀胱癌细胞增殖能力减弱,凋亡相关蛋白表达增加,EMT相关蛋白表达减弱。结论COPB2在膀胱癌中的高表达显著促进膀胱癌发生发展,是一种有前途的膀胱癌治疗靶点。展开更多
Cylindrospermopsis raciborskii and its highly similar relatives Raphidiopsis species have been recognized as globally invasive and expansive filamentous cyanobacteria causing water blooms. Reports on C. raciborsMi/Rap...Cylindrospermopsis raciborskii and its highly similar relatives Raphidiopsis species have been recognized as globally invasive and expansive filamentous cyanobacteria causing water blooms. Reports on C. raciborsMi/Raphidiopsis species and their harmful metabolites such as hepatotoxic cylindrospermopsins （CYNs） in Chinese waters have been increasing, but mostly restricted to the southern regions of China. To further explore the existence and distribution of C. raciborskii in China, six water samples from Beijing city were morphologically and molecularly examined. Five samples of the six were shown to have Cylindrospermopsis filaments with straight and spiral morphotypes. PCR detection targeting on Cylindrospermopsis/Raphidiopsis specific 16S rRNA gene region also showed the positive amplification, and such amplifications were confirmed by sequencing and phylogenetic analysis. As well, three of the five Cylindrospermopsis containing samples were shown to have cyrJ--a gene of CYN synthesis gene duster. The results represented the presence of toxic Cylindrospermopsis at the most northern line in China so far, indicating rapid expansion of this harmful invasive cyanobacterium. It is strongly suggested that the monitoring on C. raciborskii/Raphidiopsis species and their production of cylindrospermopsin should be emphasized in Beijing and even more northem parts of China.展开更多
Species in the cyanobacterial genus Merismopedia are present in freshwaters at different trophic levels, with some species even as the components of cyanobacterial blooms. However, species diversity in this genus was ...Species in the cyanobacterial genus Merismopedia are present in freshwaters at different trophic levels, with some species even as the components of cyanobacterial blooms. However, species diversity in this genus was not fully verified by molecular investigation and polyphasic taxonomic studies. In this study, Merismopedia-like strain tenuissima CHAB 7021 was isolated from Ganjiang River in Jiangxi Province, China, and polyphasic characterization of this strain was performed by morphological observation, ultrastructural examination, chemical detection of pigments and phylogenetic analysis based on 16 S rRNA gene sequences. Morphological identification of the strain was supported by the ultrastructural features, as the tiny species Merismopedia tenuissima Lemmermann. The phylogeny based on 16 S rRNA gene sequences revealed at least three clades formed by the strains of Merismopedia. The three M. tenuissima strains including M. tenuissima CHAB 7021 was gathered in clade III with distant relationship to the clade I formed by the six Merismopedia strains including the type species M. punctata, and such a genetic distance may propose Merismopedia tenuissima to separate from Merismopedia genus. However intermixture relationship in between strains of M. punctate and M. glauca in the phylogenetic tree still complicated the taxonomic status in the genus Merismopedia. The process for taxonomic revision in the Merismopedia genus still await for examination and further information on more strains of type species M. punctata.展开更多
ZnO microcrystals are synthesized through a facile solution method and characterized by field-emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction and X-ray diffr...ZnO microcrystals are synthesized through a facile solution method and characterized by field-emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction and X-ray diffraction. The ethanol sensing properties of these microcrystals are investigated by spin-coating them on a silicon substrate with Pt electrodes to fabricate a micro-structure sensor. The sensitivity is up to 8 when the sensor is exposed to 50 ppm ethanol, and the response time and recovery time are 10 s and 20 s, respectively. A contact-controlled model is established to explain the sensing properties of the microcrystals, which provides another approach to realize high-performance gas sensors.展开更多
SnO2/multiwalled carbon nanotubes (MWNTs) have been studied as gas sensing materials. Compared with pure SnO2, SnO2/MWNTs exhibit improved ethanol sensing properties such as higher sensitivity and quicker response/rec...SnO2/multiwalled carbon nanotubes (MWNTs) have been studied as gas sensing materials. Compared with pure SnO2, SnO2/MWNTs exhibit improved ethanol sensing properties such as higher sensitivity and quicker response/recovery at 300°C. The sensitivity is 35, 65, 166 and 243 to 500, 1000, 2000 and 3000 ppm ethanol, respectively. The response time is about 1 s, and the recovery time is about 5 s. The sensing improvement is explained in terms of the appropriate basal resistance and enhanced signal transfer brought by MWNTs.展开更多
α-Fe2O3 nanotubes was successfully prepared by single nozzle electrospinning method. Scanning electron microscope （SEM） was used to characterize the morphology of α-Fe2O3 nanotubes. The gas sensing properties of ...α-Fe2O3 nanotubes was successfully prepared by single nozzle electrospinning method. Scanning electron microscope （SEM） was used to characterize the morphology of α-Fe2O3 nanotubes. The gas sensing properties of α-Fe2O3 nanotubes were investigated in detail. The results exhibit relatively good sensing properties to acetone at 240℃. The response and recovery times are about 3 and 5 s, respectively. The structure of nanotubes is beneficial to the gas sensing properties, which will enlarge the surface-to-volume ratio of α-Fe2O3 and then be available for the transfer of gas, and thus improved the sensor performance consequentially.展开更多
基金Supported by the National Natural Science Foundation of China(No.41561005)
文摘Cylindrospermopsis raciborskii and its highly similar relatives Raphidiopsis species have been recognized as globally invasive and expansive filamentous cyanobacteria causing water blooms. Reports on C. raciborsMi/Raphidiopsis species and their harmful metabolites such as hepatotoxic cylindrospermopsins （CYNs） in Chinese waters have been increasing, but mostly restricted to the southern regions of China. To further explore the existence and distribution of C. raciborskii in China, six water samples from Beijing city were morphologically and molecularly examined. Five samples of the six were shown to have Cylindrospermopsis filaments with straight and spiral morphotypes. PCR detection targeting on Cylindrospermopsis/Raphidiopsis specific 16S rRNA gene region also showed the positive amplification, and such amplifications were confirmed by sequencing and phylogenetic analysis. As well, three of the five Cylindrospermopsis containing samples were shown to have cyrJ--a gene of CYN synthesis gene duster. The results represented the presence of toxic Cylindrospermopsis at the most northern line in China so far, indicating rapid expansion of this harmful invasive cyanobacterium. It is strongly suggested that the monitoring on C. raciborskii/Raphidiopsis species and their production of cylindrospermopsin should be emphasized in Beijing and even more northem parts of China.
基金Supported by the National Natural Science Foundation of China(No.41561005)the National Key Research and Development Program of China(No.2017YFA0605201)the Natural Science Foundation of Jiangxi Education Agency(No.8870)
文摘Species in the cyanobacterial genus Merismopedia are present in freshwaters at different trophic levels, with some species even as the components of cyanobacterial blooms. However, species diversity in this genus was not fully verified by molecular investigation and polyphasic taxonomic studies. In this study, Merismopedia-like strain tenuissima CHAB 7021 was isolated from Ganjiang River in Jiangxi Province, China, and polyphasic characterization of this strain was performed by morphological observation, ultrastructural examination, chemical detection of pigments and phylogenetic analysis based on 16 S rRNA gene sequences. Morphological identification of the strain was supported by the ultrastructural features, as the tiny species Merismopedia tenuissima Lemmermann. The phylogeny based on 16 S rRNA gene sequences revealed at least three clades formed by the strains of Merismopedia. The three M. tenuissima strains including M. tenuissima CHAB 7021 was gathered in clade III with distant relationship to the clade I formed by the six Merismopedia strains including the type species M. punctata, and such a genetic distance may propose Merismopedia tenuissima to separate from Merismopedia genus. However intermixture relationship in between strains of M. punctate and M. glauca in the phylogenetic tree still complicated the taxonomic status in the genus Merismopedia. The process for taxonomic revision in the Merismopedia genus still await for examination and further information on more strains of type species M. punctata.
基金Supported by the National Natural Science Foundation of China (Grant No. 10672139)
文摘ZnO microcrystals are synthesized through a facile solution method and characterized by field-emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction and X-ray diffraction. The ethanol sensing properties of these microcrystals are investigated by spin-coating them on a silicon substrate with Pt electrodes to fabricate a micro-structure sensor. The sensitivity is up to 8 when the sensor is exposed to 50 ppm ethanol, and the response time and recovery time are 10 s and 20 s, respectively. A contact-controlled model is established to explain the sensing properties of the microcrystals, which provides another approach to realize high-performance gas sensors.
基金supported by the National Innovation Experiment Program for University Students (Grant No. 2009125)
文摘SnO2/multiwalled carbon nanotubes (MWNTs) have been studied as gas sensing materials. Compared with pure SnO2, SnO2/MWNTs exhibit improved ethanol sensing properties such as higher sensitivity and quicker response/recovery at 300°C. The sensitivity is 35, 65, 166 and 243 to 500, 1000, 2000 and 3000 ppm ethanol, respectively. The response time is about 1 s, and the recovery time is about 5 s. The sensing improvement is explained in terms of the appropriate basal resistance and enhanced signal transfer brought by MWNTs.
基金supported by the Jilin Environment Office(2009-22)Jilin Provincial Science and Technology Department(20100344)the National Innovation Experiment Program for University Students(2010C65188)
文摘α-Fe2O3 nanotubes was successfully prepared by single nozzle electrospinning method. Scanning electron microscope （SEM） was used to characterize the morphology of α-Fe2O3 nanotubes. The gas sensing properties of α-Fe2O3 nanotubes were investigated in detail. The results exhibit relatively good sensing properties to acetone at 240℃. The response and recovery times are about 3 and 5 s, respectively. The structure of nanotubes is beneficial to the gas sensing properties, which will enlarge the surface-to-volume ratio of α-Fe2O3 and then be available for the transfer of gas, and thus improved the sensor performance consequentially.
