【摘要】以携带质粒pAM120(Ap^r,Tc^r/Tn916)的大肠杆菌(E.coliCG120)为供体菌株,与受体菌巴西固氮螺菌采用膜接合法进行接合转移,在选择平板上得到具较高频率的接合子(10^-5/每个供体菌,选择四环素抗性)。从846株四环素抗性接合子中进一步用奈氏法筛选得到氨分泌突变株3株。在无氮培养基上,其氨分泌量可达7.5 ̄14.0mmol/L。用乙炔还原法分析氨分泌突变株在不同浓度氮源
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