Abstract: A 1-butene/ethylene copolymer (A) satisfying the following requirements (A1) to (A5). (A1) a content of constituent units (i) derived from 1-butene is in a range of 70 to 99.9 mol %, and a content of constituent units (ii) derived from ethylene is in a range of 0.1 to 30 mol % [provided that a total of constituent units (i) and constituent units (ii) is 100 mol %]; (A2) an isotactic pentad fraction (mmmm) calculated by 13C-NMR is in a range of 80 to 99.9%; (A3) an intrinsic viscosity [?] measured in decalin at 135° C. is in a range of 0.7 to 2.0 dl/g; (A4) a melt flow rate (MFR) measured at 190° C. and a load of 2.16 kg in accordance with ASTM D1238 is 1 to 100 g/10 min; and (A5) a melting peak is not observed during second temperature raising in calorimetry with a differential scanning calorimeter (DSC).

Abstract: An object is to provide a bacterial strain having superior nitrogen fixing capability and N2O reduction capability and a microbial material containing the bacterial strain. The object can be achieved by a microbial material containing a bacterial strain belonging to the Bradyrhizobium ottawaense Glade having a nitrogen fixing capability and an N2O reduction capability.