疏水吸附分离酵母 S.Cerevisiae 中的 L-天门冬氨酸酶的研究(英文)

研究了疏水柱吸附分离工业酵母（Ｓ．Ｃｅｒｅｖｉｓｉａｅ）中的Ｌ－天门冬氨酸酶．考察了三种疏水吸附剂ＴｓｋｇｅｌＢｕｔｙ＿Ｔｏｙｏｐｅａｒｌ,ＴｓｋｇｅｌＰｈｅｎｙｌ＿Ｔｏｙｏｐｅａｒｌ和ＴｓＫｇｅｌＥｔｈｅｒ＿Ｔｏｙｏｐｅａｒｌ６５０Ｃ的吸附性能．研究表明,通过选择控制流动相的ｐＨ值和离子强度,一次吸附过程中Ｌ－天门冬氨酸酶的分离纯化纯度可提高１４倍并保持较高的活性。实验还考察了吸附等温线类型和温度等因素的影响．结果表明,酵母中分子的电荷和疏水性是疏水柱吸附的重要影响因素．     

Surface state of molybdenum cations in MoO3/CeO2

Conclusion  

微孔介质上气泡形成规律的研究

用激光测试技术对微孔介质上气泡形成规律进行了研究。实验结果表明,在微孔介质上所形成气泡的 Ｓａｕｔｅｒ平均直径随通气量的增大而减小;液相中盐或醇的引入使形成的气泡直径明显减小。使用不同模型的计算结果表明,单一孔上气泡形成模型难以描述微孔介质上气泡形成规律。为了描述微孔介质上气泡形成过程,不仅要考虑孔径减小带来的影响,而且要考虑操作条件及体系性质的变化对实际生成气泡的“有效孔”数目及当量直径等因素的影响。     

分形子-电子相互作用导致的电阻率

利用推广的Hnsch-Mahan量子输运方程,求解了分形子-电子相互作用系统的电阻率.克服了电阻率的低温发散困难,给出了电阻率反常处的温度.     

龙门山南段金台山飞来峰的结构样式

文章依据区调工作成果,把龙门山南段金台山飞来峰划分为上中下三层。并认为金台山飞来峰是一个“多层楼式”的几何结构样式。是龙门山南段逆冲推覆构造发展过程中形成的,其形成机制是重力滑动和后推挤压的综合作用。     

Absorption Spectra of 5′-carboxy-2′-hydroxychalcone and its Derivatives

Ultraviolet absorption spectra and infrared absorption spectra of 5′-carboxy-2′-hydroxychalcone and eleven derivatives substituted at side benzene nucleus are measured to elucidate the spectroscopic effects of the 5′-carboxyl group in this series of compounds.     

A chemoenzymatic approach to glycopeptide antibiotics

Many biologically active natural products are constrained by macrocyclization and modified with carbohydrates. These two types of modifications are essential for their biological activities. Here we report a chemoenzymatic approach to make carbohydrate-modified cyclic peptide antibiotics. Using a thioesterase domain from the decapeptide tyrocidine synthetase, 13 head-to-tail cyclized tyrocidine derivatives were obtained with one to three propargylglycines incorporated at positions 3-8. These cyclic peptides were then conjugated to 21 azido sugars via copper(I)-catalyzed cycloaddition. Antibacterial and hemolytic assays showed that the two best glycopeptides, Tyc4PG-14 and Tyc4PG-15, have a 6-fold better therapeutic index than the natural tyrocidine. We believe this method will also be useful for modifying other natural products to search for new therapeutics.     

Photoexcitation and photodissociation lasers. III. mechanisms of CO laser emission from the vacuum UV photodissociation of CH2COO2 and CH2COSO2 mixtures

CO laser emission was detected in the vacuum UV flash photolysis of CH₂CO. The emission is attributed to the initial photodissociation reaction

Addition of O₂ to the CH₂CO system caused a pronounced enhancement in the laser intensity. This effect is believed to be due to the removal of the CH₂ + CH₂CO reaction, which produces uninverted CO molecules. A greater laser output was obtained when SO₂ was used instead of O₂. In the O₂-added system, a total of 16 transitions ranging from Δv(8→7) to (4→3) were identified. Addition of SO₂ increased the total number of lines to 34, lasing in the range between (11→10) and (4→3). This enhancement is ascribed to the occurrence of the reaction

In addition to these chemical effects, the effects of flash energy, inert gases and total pressures have been investigated.