Ab initio calculations at HF/6-31G* level of theory for geometry optimization and MP2/6-31G*//HF/6-31G*for total energy calculation are reported for Z-cyclooctene (1). The most favorable conformation of 1 is theunsymmetric boat-chair (1-BC) geometry. Potential energy profiles for two different boat-chair/boat-chairinterconversion processes were calculated. The process via a chair transition sta...

We show  that a projective maximal submodule of afinitely generated, regular, extending module is a directsummand. Hence, every finitely generated, regular, extendingmodule with projective maximal submodules is semisimple. As aconsequence, we observe that every regular, hereditary, extendingmodule is semisimple. This generalizes and simplifies a result of  Dung and   Smith. As another consequen...

Accounting for the different contributions of aromatic rings, separated with sp 3 bonds, ab initio method we constructed hybrid cluster C 73 H 74 which UV spectrum matches most noticeable absorption band 217.5 nm, known from astrophysical observations Keywords: interaction light matter, new forms carbon, interstellar medium.

In rings of rat portal vein, endothelin-1, endothelin-2, and endothelin-3 caused graded slow contractions and potentiated spontaneous contractions. The apparent EC50 values and maximal responses to 30 nM endothelin were 1.4 nM and 0.96 g for endothelin-1, 5.2 nM and 0.65 g for endothelin-2, and 1.7 nM and 0.62 g for endothelin-3 (n = 4-12). At concentrations producing half the contraction trigg...