The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA....The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA. The treatment of plasmid DNA with β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O resulted in a fast moving band in front of the three normal conformations(super coiled DNA, linear DNA and relaxed circular DNA) in agarose gel electrophoresis . These results indicate that this chemical material may have the ability to specifically cleavage DNA or to alter conformation of DNA molecules.展开更多
在锂离子电池(LIBs)和钠离子电池(SIBs)中,设计同时适用的负极材料,使其具有高倍率性能和超长循环寿命是亟需解决的工作。本文采用静电纺丝技术和硫化工程技术成功制备了一种均匀分布在N,S-掺杂炭纳米纤维上的MoO_(2)/MoS_(2)异质结构(M...在锂离子电池(LIBs)和钠离子电池(SIBs)中,设计同时适用的负极材料,使其具有高倍率性能和超长循环寿命是亟需解决的工作。本文采用静电纺丝技术和硫化工程技术成功制备了一种均匀分布在N,S-掺杂炭纳米纤维上的MoO_(2)/MoS_(2)异质结构(MoO_(2)/MoS_(2)@NSC)。其中一维炭骨架作为导电框架可缩短Li^(+)/Na^(+)的扩散途径;炭纳米纤维中N/S杂原子的掺杂引入了丰富的活性位点,显著增强了离子扩散动力学。此外,在MoO_(2)相中通过原位形成的MoS_(2)纳米片强化了异质界面,MoO_(2)和MoS_(2)之间异质界面的构建使得Li^(+)/Na^(+)的快速传输成为实现高效储能的关键。因此,作为LIBs负极材料时,MoO_(2)/MoS_(2)@NSC电极在5.0 A g^(−1)的电流密度下循环2000圈后,仍具有640 mAh g^(−1)的优异放电比容量,每圈的容量衰减率仅为0.002%;在10.0 A g^(−1)的高电流密度下可达到614 mAh g^(−1)的放电比容量。对于SIBs,在2.0 A g^(−1)的电流密度下循环2000圈后其可逆容量仍能达到242 mAh g^(−1)。本工作采用一种新颖的界面调控策略来合理地设计负极材料,从而提高Li^(+)/Na^(+)储存动力学,实现超长寿命的循环性能。展开更多
Four series of derivatives of vanillin,anisaldehyde,genistein and aloe emodin were prepared.The single crystal of （E）-1-（5-（4-methoxyphenyl）-3-（4-methoxystyryl）-4,5-dihydro-1H-pyrazol-1-yl）ethanone,which was s...Four series of derivatives of vanillin,anisaldehyde,genistein and aloe emodin were prepared.The single crystal of （E）-1-（5-（4-methoxyphenyl）-3-（4-methoxystyryl）-4,5-dihydro-1H-pyrazol-1-yl）ethanone,which was synthesized from vanillin, was obtained by spontaneous evaporation method.All the compounds were tested for the tyrosinase inhibitory activities.The results demonstrated that the IC_（50）values of vanillin,anisaldehyde,genistein and aloe emodin against mushroom tyrosinase activity are 68,49,343 and 160μM,respectively.Among the twelve derivatives,（E）-1-（5-（4-methoxyphenyl）-3-（4-methoxystyryl）-4,5- dihydro-1H-pyrazol-1-yl）ethanone from vanillin and 4,5-dimethoxy-9,10-dioxo-9,10-dihydroanthracene-2-carboxylic acid from aloe emodin showed good inhibition against the tyrosinase with IC_（50）values of 18μM and 21μM,respectively.展开更多
文摘The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA. The treatment of plasmid DNA with β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O resulted in a fast moving band in front of the three normal conformations(super coiled DNA, linear DNA and relaxed circular DNA) in agarose gel electrophoresis . These results indicate that this chemical material may have the ability to specifically cleavage DNA or to alter conformation of DNA molecules.
文摘在锂离子电池(LIBs)和钠离子电池(SIBs)中,设计同时适用的负极材料,使其具有高倍率性能和超长循环寿命是亟需解决的工作。本文采用静电纺丝技术和硫化工程技术成功制备了一种均匀分布在N,S-掺杂炭纳米纤维上的MoO_(2)/MoS_(2)异质结构(MoO_(2)/MoS_(2)@NSC)。其中一维炭骨架作为导电框架可缩短Li^(+)/Na^(+)的扩散途径;炭纳米纤维中N/S杂原子的掺杂引入了丰富的活性位点,显著增强了离子扩散动力学。此外,在MoO_(2)相中通过原位形成的MoS_(2)纳米片强化了异质界面,MoO_(2)和MoS_(2)之间异质界面的构建使得Li^(+)/Na^(+)的快速传输成为实现高效储能的关键。因此,作为LIBs负极材料时,MoO_(2)/MoS_(2)@NSC电极在5.0 A g^(−1)的电流密度下循环2000圈后,仍具有640 mAh g^(−1)的优异放电比容量,每圈的容量衰减率仅为0.002%;在10.0 A g^(−1)的高电流密度下可达到614 mAh g^(−1)的放电比容量。对于SIBs,在2.0 A g^(−1)的电流密度下循环2000圈后其可逆容量仍能达到242 mAh g^(−1)。本工作采用一种新颖的界面调控策略来合理地设计负极材料,从而提高Li^(+)/Na^(+)储存动力学,实现超长寿命的循环性能。
基金National Key Technology R&D Program of China (Grant No.2007BAI27B05).
文摘Four series of derivatives of vanillin,anisaldehyde,genistein and aloe emodin were prepared.The single crystal of （E）-1-（5-（4-methoxyphenyl）-3-（4-methoxystyryl）-4,5-dihydro-1H-pyrazol-1-yl）ethanone,which was synthesized from vanillin, was obtained by spontaneous evaporation method.All the compounds were tested for the tyrosinase inhibitory activities.The results demonstrated that the IC_（50）values of vanillin,anisaldehyde,genistein and aloe emodin against mushroom tyrosinase activity are 68,49,343 and 160μM,respectively.Among the twelve derivatives,（E）-1-（5-（4-methoxyphenyl）-3-（4-methoxystyryl）-4,5- dihydro-1H-pyrazol-1-yl）ethanone from vanillin and 4,5-dimethoxy-9,10-dioxo-9,10-dihydroanthracene-2-carboxylic acid from aloe emodin showed good inhibition against the tyrosinase with IC_（50）values of 18μM and 21μM,respectively.
