以质膜 Ca2 +通道阻断剂 L a Cl3和钙调素 (Ca M)拮抗剂氯丙嗪 (CPZ)对水稻幼苗预处理以阻碍 Ca2 +· Ca M信使传导后 ,研究了盐胁迫下 ,稻苗保护酶活性的变化。结果表明 :0 .15 mol/ L Na Cl胁迫下 ,L a Cl3和 CPZ预处理显著加剧...以质膜 Ca2 +通道阻断剂 L a Cl3和钙调素 (Ca M)拮抗剂氯丙嗪 (CPZ)对水稻幼苗预处理以阻碍 Ca2 +· Ca M信使传导后 ,研究了盐胁迫下 ,稻苗保护酶活性的变化。结果表明 :0 .15 mol/ L Na Cl胁迫下 ,L a Cl3和 CPZ预处理显著加剧稻苗过氧化氢酶 (CAT)活性和抗坏血酸过氧化物酶 (APX)活性下降 ;对谷胱甘肽还原酶 (GR)活性则无明显影响 ;而超氧化物岐化酶 (SOD)和过氧化物酶 (POD)活性前期无明显变化 ,仅在胁迫后期明显下降。盐胁迫下 ,L a Cl3和 CPZ预处理加剧 SOD、 CAT和 APX活性下降与加剧稻苗 MDA含量积累呈显著或极显著正相关。这暗示 Ca2 + · Ca展开更多
The complex fluoride BaLiF3 and BaLiF3∶Ce3+ nanocrystals were synthesized in cetyltrimethylammonium bromide（CTAB）/2-octanol/water microemulsion systems.XRD analysis shows that the products were single phase and XPS...The complex fluoride BaLiF3 and BaLiF3∶Ce3+ nanocrystals were synthesized in cetyltrimethylammonium bromide（CTAB）/2-octanol/water microemulsion systems.XRD analysis shows that the products were single phase and XPS analysis shows the oxygen content was low.The result of ESEM confirms that the average size of the BaLiF3 nanocrystals was 28 nm in diameter.The emission peak of the BaLiF3∶Ce3+ nano-particles synthesized by microemulsion shows obvious blue shift in comparison with that of BaLiF3∶Ce3+ synthesized by the reaction at a high temperature and full width at half maximum（FWHM） of emission band was broaden.展开更多
在6种不同浓度的铈(C e3+)对0.1 m g.L-1的Cu2+毒害下,研究了菹草叶片中保护酶SOD、POD、CAT的活性,活性氧H2O2,膜脂过氧化产物M DA含量及叶绿素含量等的变化及影响.结果表明,在9~12 d之内,7.5 m g.L-1以下的C e3+可以增强SOD、CAT、PO...在6种不同浓度的铈(C e3+)对0.1 m g.L-1的Cu2+毒害下,研究了菹草叶片中保护酶SOD、POD、CAT的活性,活性氧H2O2,膜脂过氧化产物M DA含量及叶绿素含量等的变化及影响.结果表明,在9~12 d之内,7.5 m g.L-1以下的C e3+可以增强SOD、CAT、POD活性,降低M DA的含量,提高叶片中叶绿素和可溶性蛋白含量,从而减轻Cu2+对菹草植物体的伤害.而随着C e3+作用时间的延长和浓度的增大,C e3+的缓解作用不断减弱,C e3+和Cu2+产生协同效应,加重毒害.本实验结果认为,5~7.5 m g.L-1的C e3+缓解菹草叶片Cu2+毒害效果最好.展开更多
文摘以质膜 Ca2 +通道阻断剂 L a Cl3和钙调素 (Ca M)拮抗剂氯丙嗪 (CPZ)对水稻幼苗预处理以阻碍 Ca2 +· Ca M信使传导后 ,研究了盐胁迫下 ,稻苗保护酶活性的变化。结果表明 :0 .15 mol/ L Na Cl胁迫下 ,L a Cl3和 CPZ预处理显著加剧稻苗过氧化氢酶 (CAT)活性和抗坏血酸过氧化物酶 (APX)活性下降 ;对谷胱甘肽还原酶 (GR)活性则无明显影响 ;而超氧化物岐化酶 (SOD)和过氧化物酶 (POD)活性前期无明显变化 ,仅在胁迫后期明显下降。盐胁迫下 ,L a Cl3和 CPZ预处理加剧 SOD、 CAT和 APX活性下降与加剧稻苗 MDA含量积累呈显著或极显著正相关。这暗示 Ca2 + · Ca
文摘The complex fluoride BaLiF3 and BaLiF3∶Ce3+ nanocrystals were synthesized in cetyltrimethylammonium bromide（CTAB）/2-octanol/water microemulsion systems.XRD analysis shows that the products were single phase and XPS analysis shows the oxygen content was low.The result of ESEM confirms that the average size of the BaLiF3 nanocrystals was 28 nm in diameter.The emission peak of the BaLiF3∶Ce3+ nano-particles synthesized by microemulsion shows obvious blue shift in comparison with that of BaLiF3∶Ce3+ synthesized by the reaction at a high temperature and full width at half maximum（FWHM） of emission band was broaden.
