Heteropolyacid nanoparticles(NPs)were supported on Cs-modified three-dimensionally ordered macroporous(3DOM)SiO2 and used as the catalyst for the oxidation of methacrolein(MAL)to methacrylic acid(MAA).Hydrothermal tre...Heteropolyacid nanoparticles(NPs)were supported on Cs-modified three-dimensionally ordered macroporous(3DOM)SiO2 and used as the catalyst for the oxidation of methacrolein(MAL)to methacrylic acid(MAA).Hydrothermal treatment and incipient wetness impregnation were employed respectively for the Cs-modification.It was found that hydrothermal Cs-modification of 3DOM SiO2 promoted the dispersion of the supported heteropolyacid,which showed an average particle size of 5.2 nm,much smaller than that(17.6 nm)on the Csmodified 3DOM SiO2 prepared by incipient wetness impregnation.The effects of hydrothermal treatment on the structure and catalytic performance of the catalyst were investigated.Results showed that the ion exchange between Cs+and the surface silanol groups on 3DOM SiO2 was promoted with the increase of the hydrothermal temperature.Meanwhile,Cs-modification helped the heteropolyacid to retain intact Keggin structure,inhibiting the formation of MoO3.Highly dispersed heteropolyacid NPs with enhanced structural stability exhibited excellent selectivity to MAA in the oxidation of MAL.展开更多
以(NH_(4))_(6)Mo_(7)O_(24)·4H_(2)O、Bi(NO_(3))_(3)·5H_(2)O、Fe(NO_(3))_(3)·9H_(2)O、Co(NO_(3))_(2)·6H_(2)O和KNO_(3)为前驱体金属盐,通过共沉淀法制备了一系列MoBiFeCoK混合氧化物催化剂,考察了主金属Mo、...以(NH_(4))_(6)Mo_(7)O_(24)·4H_(2)O、Bi(NO_(3))_(3)·5H_(2)O、Fe(NO_(3))_(3)·9H_(2)O、Co(NO_(3))_(2)·6H_(2)O和KNO_(3)为前驱体金属盐,通过共沉淀法制备了一系列MoBiFeCoK混合氧化物催化剂,考察了主金属Mo、Bi,助金属Fe、Co和掺杂金属K含量对催化剂催化异丁烯气相氧化反应的影响,通过SEM、EDX、XRD、NH_(3)-TPD对掺杂K前后的催化剂进行了表征,同时对催化异丁烯气相氧化反应条件进行了优化,并测试其100 h的催化稳定性。结果表明,Bi、Fe、Co和K的含量对MoBiFeCoK混合氧化物催化剂催化异丁烯气相氧化反应的性能有显著影响,其中,Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)表现出最优催化性能;K的掺杂降低了催化剂酸量(从Mo12Bi1.2Fe3Co8的15.27μmol/g降至Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)的5.91μmol/g),并明显提升主产物甲基丙烯醛(MAL)的选择性;异丁烯气相氧化反应的最佳条件为:以0.66 g Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)为催化剂,反应温度320℃,n(O_(2))∶n(异丁烯)(氧烯比)=10∶1,体积空速(GHSV)=2000h^(-1)。在该条件下,Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)在100h的催化异丁烯气相氧化反应中表现稳定,异丁烯转化率保持在98.6%,MAL选择性保持在86.4%。展开更多
目的探讨MAL2(myelin and lymphocyte protein 2)在肺癌中的功能及作用机制。方法分析TCGA数据中MAL2在肺癌组织中的表达情况,在H1299和A549细胞中用克隆形成实验检测MAL2基因敲减后对肺癌细胞增殖的影响,探讨MAL2在肺腺癌细胞增殖中的...目的探讨MAL2(myelin and lymphocyte protein 2)在肺癌中的功能及作用机制。方法分析TCGA数据中MAL2在肺癌组织中的表达情况,在H1299和A549细胞中用克隆形成实验检测MAL2基因敲减后对肺癌细胞增殖的影响,探讨MAL2在肺腺癌细胞增殖中的作用,并用CCK8等细胞增殖、转移、凋亡实验进一步验证其功能;将MAL2干扰后,采用Western blot实验检测下游通路基因表达情况以分析MAL2基因可能的作用机制。结果MAL2基因在肺癌组织与癌旁组织相比表达显著升高(P<0.05),且MAL2敲减后抑制细胞增殖和转移、促进细胞凋亡(P<0.05);MAL2可能通过调控SGK1通路发挥作用。结论MAL2基因在肺癌的恶性进展中起重要的作用,该作用通过调控SGK1机制进行,MAL2基因是肺癌的一个新的潜在的分子诊断指标及治疗靶点。展开更多
基金financially supported by the National Natural Science Foundation of China(21206179)the Natural Science Foundation of Shandong Province(ZR2018MB033)。
文摘Heteropolyacid nanoparticles(NPs)were supported on Cs-modified three-dimensionally ordered macroporous(3DOM)SiO2 and used as the catalyst for the oxidation of methacrolein(MAL)to methacrylic acid(MAA).Hydrothermal treatment and incipient wetness impregnation were employed respectively for the Cs-modification.It was found that hydrothermal Cs-modification of 3DOM SiO2 promoted the dispersion of the supported heteropolyacid,which showed an average particle size of 5.2 nm,much smaller than that(17.6 nm)on the Csmodified 3DOM SiO2 prepared by incipient wetness impregnation.The effects of hydrothermal treatment on the structure and catalytic performance of the catalyst were investigated.Results showed that the ion exchange between Cs+and the surface silanol groups on 3DOM SiO2 was promoted with the increase of the hydrothermal temperature.Meanwhile,Cs-modification helped the heteropolyacid to retain intact Keggin structure,inhibiting the formation of MoO3.Highly dispersed heteropolyacid NPs with enhanced structural stability exhibited excellent selectivity to MAA in the oxidation of MAL.
文摘目的观察豆蔻明(Cardamonin,CDN)对肺纤维化小鼠的作用,并探究其对转化生长因子-β1(transforming growth factor-β1,TGF-β1)/smad信号通路的影响。方法将小鼠随机分为生理盐水(Sham)组、博莱霉素(Bleomycin,BLM)组、豆蔻明低剂量(low dose of Cardamonin,CDN-L)组、豆蔻明中剂量(medium dose of Cardamonin,CDN-M)组、豆蔻明高剂量(high dose of Cardamonin,CDN-H)组、地塞米松(dexamethasone,DXM)组;单次气管注射BLM诱导肺纤维化,计算肺指数;酶联免疫吸附法测血清肿瘤坏死因子(tumor necrosis factor-α,TNF-α)水平;试剂盒测肺组织羟脯氨酸(hydroxyproline,HYP)含量,苏木精-伊红、马松染色观察肺炎症程度及纤维化情况,RT-PCR法检测肺组织TGF-β1/smad信号通路相关基因表达情况。结果与Sham组相比,BLM组小鼠肺指数、Szapiel评分、Ashcroft评分明显升高(P<0.05),肺部炎症程度和纤维化程度严重。血清中TNF-α含量升高(P<0.05)、肺组织HYP水平升高(P<0.05),TGF-β1[(1.02±0.21)vs.(3.25±0.14)]、smad2[(1.00±0.05)vs.(1.63±0.09)]、smad3[(1.00±0.06)vs.(1.82±0.07)]、α-平滑肌肌动蛋白(α-smoothmuscleactin,α-SMA)[(1.00±0.10)vs.(2.15±0.10)]mRNA表达升高(P<0.05),上皮-钙黏蛋白(E-Cadherin)[(1.01±0.16)vs.(0.57±0.09)]mRNA水平降低(P<0.05)。CDN-M、CDN-H干预可减低小鼠肺指数,减轻炎性和肺纤维化,降低TNF-α、HYP水平(P<0.05),同时下调肺纤维小鼠肺组织中TGF-β1、smad2、smad3、α-SMA表达,上调E-Cadherin表达。CDN-L无明显治疗效果,CDN-H治疗作用与DXM相似。结论CDN可能通过TGF-β1/Smad通路介导上皮-间充质转化而发挥抗纤维化作用。
文摘以(NH_(4))_(6)Mo_(7)O_(24)·4H_(2)O、Bi(NO_(3))_(3)·5H_(2)O、Fe(NO_(3))_(3)·9H_(2)O、Co(NO_(3))_(2)·6H_(2)O和KNO_(3)为前驱体金属盐,通过共沉淀法制备了一系列MoBiFeCoK混合氧化物催化剂,考察了主金属Mo、Bi,助金属Fe、Co和掺杂金属K含量对催化剂催化异丁烯气相氧化反应的影响,通过SEM、EDX、XRD、NH_(3)-TPD对掺杂K前后的催化剂进行了表征,同时对催化异丁烯气相氧化反应条件进行了优化,并测试其100 h的催化稳定性。结果表明,Bi、Fe、Co和K的含量对MoBiFeCoK混合氧化物催化剂催化异丁烯气相氧化反应的性能有显著影响,其中,Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)表现出最优催化性能;K的掺杂降低了催化剂酸量(从Mo12Bi1.2Fe3Co8的15.27μmol/g降至Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)的5.91μmol/g),并明显提升主产物甲基丙烯醛(MAL)的选择性;异丁烯气相氧化反应的最佳条件为:以0.66 g Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)为催化剂,反应温度320℃,n(O_(2))∶n(异丁烯)(氧烯比)=10∶1,体积空速(GHSV)=2000h^(-1)。在该条件下,Mo_(12)Bi_(1.2)Fe_(3)Co_(8)K_(0.4)在100h的催化异丁烯气相氧化反应中表现稳定,异丁烯转化率保持在98.6%,MAL选择性保持在86.4%。
文摘目的探讨MAL2(myelin and lymphocyte protein 2)在肺癌中的功能及作用机制。方法分析TCGA数据中MAL2在肺癌组织中的表达情况,在H1299和A549细胞中用克隆形成实验检测MAL2基因敲减后对肺癌细胞增殖的影响,探讨MAL2在肺腺癌细胞增殖中的作用,并用CCK8等细胞增殖、转移、凋亡实验进一步验证其功能;将MAL2干扰后,采用Western blot实验检测下游通路基因表达情况以分析MAL2基因可能的作用机制。结果MAL2基因在肺癌组织与癌旁组织相比表达显著升高(P<0.05),且MAL2敲减后抑制细胞增殖和转移、促进细胞凋亡(P<0.05);MAL2可能通过调控SGK1通路发挥作用。结论MAL2基因在肺癌的恶性进展中起重要的作用,该作用通过调控SGK1机制进行,MAL2基因是肺癌的一个新的潜在的分子诊断指标及治疗靶点。
