A review of the cyprinoid fish genus Barbodes Bleeker, 1859, from Yunnan, China, with descriptions of two new species

Fishes of the genus Barbodes in Yunnan have been reviewed and 2 new species are described on the basis of specimens deposited in Kunming institute of Zoology, Chinese Academy of Sciences. Counts and measurements follow Chu and Chen (1989). Barbodes heterostomus is distinguished by its terminal mouth, with gape being horizontal in the male, and acclivitous in the female, last unbranched dorsal ray smooth with upper 1/3 articulated; dorsal fin origin anterior to pelvic fin origin; no dark lateral band on sides of body; gill rakers 13-19; lateral line scales 24-29; longest caudal ray length about 2 times that of shortest. It is distributed in Longchuanjiang and Dayingjiang (upper Irrawaddy). Barbodes baoshanensis is distinguished by its smooth last unbranched dorsal ray with upper 1/3-1/2 articulated; dorsal fin origin anterior to pelvic fin origin; sides of body with a dark longitudinal band; gill rakers 13-14; lateral line scales 23-28. It occurs in Nujiang (upper Salween) and Longchuanjiang. A key to the species of Barbodes in Yunnan is provided.

Molybdenum containing surface complex for olefin epoxidation

Silica-supported molybdenum surface complexes were prepared by the reaction between (N=) Mo(OtBu)(3) and silica via displacement of the tert-butoxy ligands for siloxyls from the silica surface. The structure of the surface molybdenum complexes was well defined by in-situ FT-IR, elemental analysis, H-1 NMR and C-13 CP/MAS NMR techniques. The surface complexes could undergo alcoholysis reaction with CD3OD and CH3OH in the same way as free (N =) Mo(OtBu)(3) and they show high catalytic activity and selectivity in olefin epoxidation. Initial rates up to 24.9 mmol epoxide (mmol Mo)(-1) min(-1) were achieved in the epoxidation of cyclohexene using TBHP as oxidant.

A fucoidan fraction from Ascophyllum nodosum

A fucoidan fraction was purified from the brown alga Ascophyllum nodosum. The polysaccharide contained -fucose and sulfate as the only constituents. Combination of methylation analysis, Smith degradation, FTIR and NMR spectroscopy on the native and the de-sulfated polymers demonstrated that the fucoidan consisted of a highly branched core region with primarily α-(1→3)-linked fucosyl residues and a few α-(1→4) linkages. Branch points were at position 2 of the →3-linked internal residues. The side chains consisted of single and multi-unit fucosyl residues. The combined analytical data suggested also a complex sulfation pattern with substitution principally at position 2 and/or position 4. Such diversity in the structural features of this fucoidan may be of importance for its various biological properties.