24s-Stigmasta 4,25-diene,3 beta,6 beta-diol 1,a new sterol has been isolated from the algae Laurencia majuscula collected from the south China sea. Its structure was elucidated by spectroscopic methods. Compound 1 was...24s-Stigmasta 4,25-diene,3 beta,6 beta-diol 1,a new sterol has been isolated from the algae Laurencia majuscula collected from the south China sea. Its structure was elucidated by spectroscopic methods. Compound 1 was cytotoxic against the P-388 cell line with an IC50 value of 1.2 mu g/ml.展开更多
The electronic features in a proposed organic ferromagnet is presented by the first-principle scheme. A specific pi band is dominant in this organic ferromagnet.
RECENTLY,great attention has been paid to the physical and chemical properties of atomic andsemiconductor clusters.On the properties of AlB_n atomic cluster,experimental studieshave been reported,yet theoretical studi...RECENTLY,great attention has been paid to the physical and chemical properties of atomic andsemiconductor clusters.On the properties of AlB_n atomic cluster,experimental studieshave been reported,yet theoretical studies have not been seen.Aluminium borides(AlB_n)have been widely used to change the fiber strength in mechanical engineering and to adjust展开更多
文摘24s-Stigmasta 4,25-diene,3 beta,6 beta-diol 1,a new sterol has been isolated from the algae Laurencia majuscula collected from the south China sea. Its structure was elucidated by spectroscopic methods. Compound 1 was cytotoxic against the P-388 cell line with an IC50 value of 1.2 mu g/ml.
文摘The electronic features in a proposed organic ferromagnet is presented by the first-principle scheme. A specific pi band is dominant in this organic ferromagnet.
文摘RECENTLY,great attention has been paid to the physical and chemical properties of atomic andsemiconductor clusters.On the properties of AlB_n atomic cluster,experimental studieshave been reported,yet theoretical studies have not been seen.Aluminium borides(AlB_n)have been widely used to change the fiber strength in mechanical engineering and to adjust
