A New Flavanone from the Bark of Morus macoura Miq.

“Sang Bai Pi”, the bark of mulberry, has been used as herbal medicine to treat diabetes, arthritis, rheumatism for thousands of years. Phytochemical studies on some Morus species revealed that they contained phenolic compounds1. Macrourone C (1) was isolated from Morus macroura Miq. In this paper, the structure of 1 was elucidated on the basis of spectoscopic evidence.Figure 1 Structure and Key HMBC for 1 1Macrourone C (1), a yellow powder, exhibited dark blue fluorescence under UV li…     

A Taxatetraene from Microbial Transformation of Sinenxan A

Sinenxan A [2α, 5α, 10β, 14β-tetraacetoxytaxa-4(20), ll-diene, 1] was biotransformed by a filamentous fungus, Aspergillus niger JCM 5546, and an unusual taxatetraene [2α,5α-acetoxytaxa-4(20), 10(11), 12(18), 13(14)-tetraene, 2], together with two known products,10β-deacetyl sinenxan A (3) and 10β, 14β-dideacetyl sinenxan A (4) were produced.     

Synthesis of novel 15-membered macrolide dimers

A series of novel dimers of 15-membered macrolides was synthesized and evaluated.The dimers exhibited excellent activity against erythromycin-susceptible S.pneumonia,but did not show any improved activity against erythromycin-resistant S. pneumoniae encoded by erm gene.     

A New Isoprenylated flavonol from the Leaves of Broussonetia kazinoki

Broussonetia kazinoki Sieb (Moraceae) is distributed throughout China and Japan. Previous investigations of this plant revealed the presence of isoprenylated flavans, isoprenylated flavonoids, isoprenylated 1,3-diphenylpropanes1 and alkaloids2,3. Natural prenylated flavonoids have shown potent inhibition against human hepatoma PLC/PRF/5 and epidermoid carcinoma KB cells in vitro4. In order to search for its biologically active compounds, chemical study on this plant was carried out and le…     

A New Flavone from the Roots of Uvaria macrophylla

Uvaria macrophylla is an evergreen tree of the family annonaceae, distributed in Hainan Province, China1. A new flavone, macrophyllol was isolated from the roots of Uvaria macrophylla. In this article we report the structure elucidation of 1.Macrophyllol 1 was isolated as yellow plate crystals, mp: 132-133(C, [(] +4.92 (c 0.06, MeOH). The HREIMS of 1 exhibited [M]+ at m/z 436.1504 corresponding to the molecular formula C25H24O7 (calc.436.1522). The IR spectrum of 1, showed the presenc…     

再论冷聚变机理与冷聚变材料的提出

阐明我过去对冷聚变的思考与机理的提出，现在对此机理进一步进行深入的分析，从而了研制为材料的设想。     

原子半径和电负性与掺杂铁基砷化物超导电性的关系

本文提出一个计算原子半径差和电负性差的方法,研究了原子半径差Δd和电负性差Δe及它们之比△d/△e与掺杂铁基砷化物体系超导转变温度Tc的关系,发现三者都与转变温度有很好的规律性.由此,提出用原子半径差、电负性差及它们之比△d/△e作为提高掺杂铁基砷化物超导电性的一个新依据。     

KrFH体系的势能函数与反应动力学研究(Ⅰ)基态KrFH的分析势能函数

使用ａｂｉｎｉｔｉｏ计算ＨＦ／ＬＡＮＬ２ＤＺ方法优化出了基态ＫｒＨＦ为Ｃ∞ｖ结构，而基态ＫｒＦＨ为Ｃｓ结构，同时，计算了平衡几何和离解能，并用ａｂｉｎｉｔｉｏ计算ＭＰ２／ＬＡＮＬ２ＤＺ方法计算了谐性力常数。应用多体项展式法导出了ＫｒＦＨ（Ｘ１Ａ′）体系的分析势能函数，研究了势能面上的主要特征     

Pb的类Fe、Co、Ni、Cu、Zn离子(Pb~(52 )-Pb~(56 ))能级和跃迁的相对论计算

采用相对论多组态平均能级模型（ＧＲＡＳＰ２－ＡＬ），计算了Ｐｂ的类Ｆｅ、Ｃｏ、Ｎｉ、Ｃｕ、Ｚｎ离子（Ｐｂ５２＋－Ｐｂ５６＋）的精细结构能级、跃迁波长、自发辐射跃迁几率、受激辐射跃迁几率和振子强度。波长的计算结果与实验值和文献的计算结果进行了比较     

氢原子团簇的电子能谱与吸收光谱

文献［１］从理论上阐明了金属原子团簇的公有公有化电子 能谱具有分裂能级的特点，因而其公有化电子具有吸光的特性，并计算了Ｃｕ与Ａｌ的金属原子团簇的吸收光主普。现进一步推广此理论来计算氢原子团簇的电子能谱与吸收光谱。