Directionally solidified binary Mg-Al eutectic alloy wires of approximately 5 mm in diameter were produced by the Ohno continuous casting （OCC） process and the microstructure was examined. It was found that the wire...Directionally solidified binary Mg-Al eutectic alloy wires of approximately 5 mm in diameter were produced by the Ohno continuous casting （OCC） process and the microstructure was examined. It was found that the wires possess obvious unidirectional growth characteristic along its axial direction. The microstructure consists of parallel columnar grains that resulted from the competitive growth of equiaxed grains solidified on the head of dummy bar. Each columnar grain comprises regular eutectic a-Mg and β-Mg17 Al12 phases, which grew along the axial direction of the wires. The morphology of the eutectic is mainly lamellar, meanwhile rod eutectic exists. The formation of rod eutectic was attributed to the ＂bridging effect＂ caused by incidental elements in the alloy.展开更多
Sp-Octyl-(8-Chloroadenosine)-3’,5’-Cyclophosphate (OCC), a newlysynthesized cAMP analog, strongly induces growth inhibition and differentiation in human promyelocytic leukemia HL-60 cells. The effect of OCC is dose-...Sp-Octyl-(8-Chloroadenosine)-3’,5’-Cyclophosphate (OCC), a newlysynthesized cAMP analog, strongly induces growth inhibition and differentiation in human promyelocytic leukemia HL-60 cells. The effect of OCC is dose-time dependent. By using the LKB2277 Bioactivity Monitor,we determined the heat production rate of HL-60 cells treated by OCC at different concentrations. It was found that the heat production rate of HL-60 cell treated by OCC gradually decreased to that of normal human neutrophiles.展开更多
基金the Shaanxi Provincial Natural Science Research Project(No.2003E111)Scientific research project of Education Department of Shaanxi Province(No.07JK358)the Industrialization Cultivation Project of Education Department of Shaanxi Province(No.04JC24).
文摘Directionally solidified binary Mg-Al eutectic alloy wires of approximately 5 mm in diameter were produced by the Ohno continuous casting （OCC） process and the microstructure was examined. It was found that the wires possess obvious unidirectional growth characteristic along its axial direction. The microstructure consists of parallel columnar grains that resulted from the competitive growth of equiaxed grains solidified on the head of dummy bar. Each columnar grain comprises regular eutectic a-Mg and β-Mg17 Al12 phases, which grew along the axial direction of the wires. The morphology of the eutectic is mainly lamellar, meanwhile rod eutectic exists. The formation of rod eutectic was attributed to the ＂bridging effect＂ caused by incidental elements in the alloy.
文摘Sp-Octyl-(8-Chloroadenosine)-3’,5’-Cyclophosphate (OCC), a newlysynthesized cAMP analog, strongly induces growth inhibition and differentiation in human promyelocytic leukemia HL-60 cells. The effect of OCC is dose-time dependent. By using the LKB2277 Bioactivity Monitor,we determined the heat production rate of HL-60 cells treated by OCC at different concentrations. It was found that the heat production rate of HL-60 cell treated by OCC gradually decreased to that of normal human neutrophiles.
