The new solid complexes [LnL2(NO3)2]NO3 (L=C18H23NO2, N-2-hydroxy-3-me thoxy-benzaldehyde-1-aminoadamanantane, Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, H o, Er, Tm, Yb, Lu, Y) of rare earth nitrates with Schiff base derived from o-van illin and adamantaneamine have been synthesized in non-aqueous system and charac terized by elemental analysis, molar conductance, infrared spectra, 1H NMR spect ra, thermal analysis. The coordination modes of the bonding in these complexes w ere discussed and the possible structure were proposed. Every central Ln(III) io n in the complexes coordinates with both two Schiff base ligands via four oxygen atoms of the phenol hydroxy groups and methoxy groups and two nitrates via thei r four oxygen atoms. Their coordination numbers are eight. In addition, the anti bacterial activity of the Schiff base ligand and the complexes were studied.
从稻田土壤、水稻植株、昆虫肠道等环境中分离纯化得到88株菌株,以水稻白叶枯病菌生理小种P6菌株为指示菌,通过琼脂块法和牛津杯法从中筛选得到了对水稻白叶枯病菌具有明显拮抗作用的12号菌株,其抑菌圈直径为6.09 cm.根据12号拮抗菌株菌落和菌丝形态特征、生理生化特征及16S r DNA序列分析结果,鉴定该菌株为Streptomyces gramineus.该拮抗菌发酵液具有较强的热稳定性、酸碱稳定性和光照稳定性,将其作为生物农药具有一定的应用价值和开发前景.
