Two-dimensional polyacrylamide gel assisted laser desorption/ionization electrophoresis （2D-PAGE） and matrixtandem time-of-flight mass spectrometry （MALDI-TOF/TOF-MS）, incorporated with online database searching,...Two-dimensional polyacrylamide gel assisted laser desorption/ionization electrophoresis （2D-PAGE） and matrixtandem time-of-flight mass spectrometry （MALDI-TOF/TOF-MS）, incorporated with online database searching, were performed to investigate differential proteins of breast cancer and adjacent normal breast tissues. Considering that serum albumin is abundantly presented in normal control samples, 15 differential spots detected in 11 out of 12 （91.7%） breast cancer samples were identified by online SIENA-2DPAGE database searching and MALDI-TOF/TOF-MS analysis. The results indicate that pathological changes of breast cancer are concerned with augmentation of substance metabolism, promotion of proteolytic activity, decline of activity of some inhibitors of enzymes, and so on. Some important proteins involved in the pathological process of breast cancer with changed expression may be useful biomarkers, such as alpha-l-antitrypsin, EF- 1-beta, cathepsin D, TCTP, SMT3A, RPS12, and PSMA1, among which SMT3A, RPSl2, and PSMA1 were first reported for breast cancer in this study.展开更多
本文研究了蔗糖癸酸酯对沙门氏菌的体外抗菌作用及其机理。采用肉汤稀释法测定了不同p H值下蔗糖癸酸酯对沙门氏菌的最小抑菌浓度(MIC)和最小杀菌浓度(MBC)。通过测定菌体渗漏物、SDS-聚丙烯酰胺凝胶电泳分析、扫描电镜观察、DNA结合试...本文研究了蔗糖癸酸酯对沙门氏菌的体外抗菌作用及其机理。采用肉汤稀释法测定了不同p H值下蔗糖癸酸酯对沙门氏菌的最小抑菌浓度(MIC)和最小杀菌浓度(MBC)。通过测定菌体渗漏物、SDS-聚丙烯酰胺凝胶电泳分析、扫描电镜观察、DNA结合试验等,初步研究了蔗糖癸酸酯对沙门氏菌的抗菌机理。结果表明:蔗糖癸酸酯在p H 7.0时对沙门氏菌的MIC为20 m M,在酸性条件下抗菌效果更为显著。蔗糖癸酸酯能够使菌体细胞内核酸、蛋白质和还原糖等外泄,影响细胞膜结构完整性和菌体正常形态;对菌体细胞蛋白(尤其是大分子量蛋白)的合成与积累有干扰作用;同时糖酯的亲水性头基可与DNA磷酸基团以氢键的方式结合,使DNA骨架收缩。因此,可将蔗糖癸酸酯作为兼具乳化和防腐作用的多功能食品添加剂,应用于动物源性食品的加工和储藏过程中。展开更多
[Objective] This study was to elucidate the cellular and molecular mechanism of the development of heteromorphic leaves of Populus euphratica Oliv. [Method] By employing SDS-PAGE and 2-demensional electrophoresis (2-D...[Objective] This study was to elucidate the cellular and molecular mechanism of the development of heteromorphic leaves of Populus euphratica Oliv. [Method] By employing SDS-PAGE and 2-demensional electrophoresis (2-DE) techniques,proteins in various heteromorphic leaves from the same adult tree of P. euphratica were isolated and separated to the electrophoresis technique suitable for the separation and analysis of proteins in leaves of P. euphratica tree. [Results] There were significant differences in the expressions of proteins in various heteromorphic leaves of P. euphratica tree. SDS-PAGE pattern showed that bands of proteins with molecular weight of 57.2,13.2,30.2,23.9 and 33.3 kDa were remarkably different. 2-D electrophoresis pattern presented that proteins in leaves of P. euphratica tree mainly belong to acidic proteins distributed at pH value of 5.0-6.5 and with molecular weight of 20-40 kDa; totally 73 different protein spots were observed,of which 51 were up expressed and other 22 were down expressed in the serrated ovate leaves. [Conclusion] Based on these results,we speculate that regulated gene expression in leaves of P. euphratica tree results in the generation of different shapes of leaves,in order to adapt to the surroundings better.展开更多
文摘Two-dimensional polyacrylamide gel assisted laser desorption/ionization electrophoresis （2D-PAGE） and matrixtandem time-of-flight mass spectrometry （MALDI-TOF/TOF-MS）, incorporated with online database searching, were performed to investigate differential proteins of breast cancer and adjacent normal breast tissues. Considering that serum albumin is abundantly presented in normal control samples, 15 differential spots detected in 11 out of 12 （91.7%） breast cancer samples were identified by online SIENA-2DPAGE database searching and MALDI-TOF/TOF-MS analysis. The results indicate that pathological changes of breast cancer are concerned with augmentation of substance metabolism, promotion of proteolytic activity, decline of activity of some inhibitors of enzymes, and so on. Some important proteins involved in the pathological process of breast cancer with changed expression may be useful biomarkers, such as alpha-l-antitrypsin, EF- 1-beta, cathepsin D, TCTP, SMT3A, RPS12, and PSMA1, among which SMT3A, RPSl2, and PSMA1 were first reported for breast cancer in this study.
文摘本文研究了蔗糖癸酸酯对沙门氏菌的体外抗菌作用及其机理。采用肉汤稀释法测定了不同p H值下蔗糖癸酸酯对沙门氏菌的最小抑菌浓度(MIC)和最小杀菌浓度(MBC)。通过测定菌体渗漏物、SDS-聚丙烯酰胺凝胶电泳分析、扫描电镜观察、DNA结合试验等,初步研究了蔗糖癸酸酯对沙门氏菌的抗菌机理。结果表明:蔗糖癸酸酯在p H 7.0时对沙门氏菌的MIC为20 m M,在酸性条件下抗菌效果更为显著。蔗糖癸酸酯能够使菌体细胞内核酸、蛋白质和还原糖等外泄,影响细胞膜结构完整性和菌体正常形态;对菌体细胞蛋白(尤其是大分子量蛋白)的合成与积累有干扰作用;同时糖酯的亲水性头基可与DNA磷酸基团以氢键的方式结合,使DNA骨架收缩。因此,可将蔗糖癸酸酯作为兼具乳化和防腐作用的多功能食品添加剂,应用于动物源性食品的加工和储藏过程中。
文摘[Objective] This study was to elucidate the cellular and molecular mechanism of the development of heteromorphic leaves of Populus euphratica Oliv. [Method] By employing SDS-PAGE and 2-demensional electrophoresis (2-DE) techniques,proteins in various heteromorphic leaves from the same adult tree of P. euphratica were isolated and separated to the electrophoresis technique suitable for the separation and analysis of proteins in leaves of P. euphratica tree. [Results] There were significant differences in the expressions of proteins in various heteromorphic leaves of P. euphratica tree. SDS-PAGE pattern showed that bands of proteins with molecular weight of 57.2,13.2,30.2,23.9 and 33.3 kDa were remarkably different. 2-D electrophoresis pattern presented that proteins in leaves of P. euphratica tree mainly belong to acidic proteins distributed at pH value of 5.0-6.5 and with molecular weight of 20-40 kDa; totally 73 different protein spots were observed,of which 51 were up expressed and other 22 were down expressed in the serrated ovate leaves. [Conclusion] Based on these results,we speculate that regulated gene expression in leaves of P. euphratica tree results in the generation of different shapes of leaves,in order to adapt to the surroundings better.
