Ir doping-induced superconductivity in the SmFeAsO system.

The 5d transition metal Ir is successfully doped for Fe in SmFeAsO to induce superconductivity with T(c) = 16 K at a doping level of approximately 15 atom %. Ir doping decreases the As-Fe-As bond angle, beta; this behavior is different from the change in beta for the system with doping charges in the charge-reservoir layers.

[Isolation and degrading characters of pendimethalin degrading bacteria].

Microbial degradation of pendimethalin and the effects of culture conditions in vitro are studied. Twenty-nine strains are isolated by enrichment from soil and sludge. 3 strains can degrade more than 80% of pendimethalin of 100 mg x L(-l) in 3 days in culture fluid. 2 bacteria are considered as efficiently degrading strains identified as Pseudomonas, Mirococcus luteus. The efficiency of degradation is affected by culture conditions such as pH, temperature and the concentration of sucrose and pendimethanlin. The optimal conditions are proposed.