i-Motif在分子拥挤条件下的性质

DNA分子除了通常的反平行双螺旋结构之外，某些特定的DNA序列还能够形成三链、四链或Holliday十字等核酸的空间特异结构．富含C的单链DNA分子可以在酸性条件下通过C碱基的半质子化C＋·C碱基对形成稳定的平行双螺旋，两个平行双螺旋上的C＋·C碱基对可以以交替排列和互相嵌入（Intercalate）的形式形成四螺旋结构，这种四螺旋结构即为／-Motif（图1）

i-Motif在分子拥挤条件下的性质

DNA分子除了通常的反平行双螺旋结构之外，某些特定的DNA序列还能够形成三链、四链或Holliday十字等核酸的空间特异结构．富含C的单链DNA分子可以在酸性条件下通过C碱基的半质子化C＋·C碱基对形成稳定的平行双螺旋，两个平行双螺旋上的C＋·C碱基对可以以交替排列和互相嵌入（Intercalate）的形式形成四螺旋结构，这种四螺旋结构即为／-Motif（图1）

Correlation of trap states and carrier dynamics of TiO2 with photocatalytic

Anatase and rutile TiO2 were investigated with photoluminescence (PL) techniques under weak excitation condition. The visible emission band was assigned to the donor-acceptor recombination. Oxygen vacancies and hydroxyl groups mainly serve as the donor and acceptor sites, respectively. The NIR luminescence is originated from the recombination of trapped electrons with free holes. The carrier dynamics in anatase TiO2 are sensitively affected by heat treatment and the presence of oxygen, while the decay processes stay relatively unchanged for rutile TiO2. The trap states in TiO2 may largely influence the photocatalysis process of TiO2 and may determine the photocatalytic activity

Enantioselective Diels-Alder Reaction Catalyzed by G-Quadruplex DNA and Its Metalloenzyme

Enantioselective Diels-Alder Reaction Catalyzed by G-Quadruplex DNA and Its Metalloenzym