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A subbitumious coal from Erdos, Inner Mongolia, China, was extracted with isometric CS 2 /tetrahydrofuran mixed solvent. The extract was separated by silica-gel column chromatography. A series of long-chain normal alkanes, monoaromatic steranes, polycyclic arenes and heteroatom-containing species in the extract were concentrated to large extents. In addition, abiettriene and retene were separated...
To characterize quantitatively the viscoelastic behaviors of cryopreserved rabbit carotid arteries, five mechanical models, i.e. standard linear model, and four kinds of generalized Maxwell models, were comparatively applied. Specific aim of this study was to test the validity of these models to simulate the stress relaxation behaviors of the cryopreserved arteries and to find a best-fit model for...
A carbon disulfide-soluble fraction (CDSSF) from Shenfu coal was separated into five fractions by silica-gel column chromatography using hexane and n-hexane/ethyl acetate binary eluent. The five fractions include four clear group fractions and a nonpolar fraction. All the fractions were analyzed by GC/MS. A total of 204 compounds were detected from the original CDSSF and its further separated fractions,...
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