Abstract: A concentrating column useful for elemental analysis of trace metals consists mainly of column body, filtration membranes 6 fixed at the fluid inlet end and the outlet end of the column body, and column packing 8 packed inside the column body, wherein column packing 8 is prepared from the swollen and cleaned macroporous adsorbent resin of high, medium or non-polarity treated with a mixture of 3 mol/L NH4OH-1 mol/L HAC-3.0˜6.0×10?4 mol/L pyridin-(2-azo-4-)resorcin or a mixture of 0.5 mol/L Na2HPO4-1.0˜2.0×10?4 mol/L pyridin-(2-azo-4-)resorcin by dynamic on-column treatment or static immersion treatment. Two types of sample processing devices useful for elemental analysis of trace metals are provided with concentrating column employing the above-mentioned column packing.

Abstract: A method for the preparation of aryl methyl ketones converts a variety of ethyl arenas to the corresponding aryl methyl ketones using a dioxygen-containing gas as the oxidant. The catalyst used for the reaction is a metal complex bearing general formulas as disclosed.

Abstract: The present invention provides a method for establishing an expression system of spider dragline silk gene in Bombyx mori. The rate of transformation is about 0.5-1%. In the silk protein produced by the transgenic Bombyx mori obtained by the method of the present invention, the spider dragline silk gene product account for 30% of the total silk proteins.