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WLY78 Enables Expression of Active Nitrogenase in Escherichia coli 171 Comparative Genomic Analysis of N2-Fixing and Non-N2-Fixing Paenibacillus spp.: Organization£¬ Evolution and Expression of the Nitrogen Fixation Genes 188 Positive and Negative Regulation of Transferred nif Genes Mediated by Indigenous GlnR in Gram-positive Paenibacillus polymyxa 212 Combined Assembly and Targeted Integration of Multigene for Nitrogenase Biosynthetic Pathway in Saccharomyces cerevisiae 234 Influence of pN2 and pD2 on HD Formation by Various Nitrogenases 248 ¹ÌµªÃ¸´ß»¯µÄ·ÅH2·´Ó¦ 265 ·ÎÑ׿ËÊϸ˾ú¹ÌµªÃ¸Ë«Í»±äÖêµÄ¹¹½¨¼°Æä¶Ôµ×ÎﻹԭµÄÌØÐÔ 275 N2 ºÍH+Ôڹ̵ªÃ¸»îÐÔÖÐÐĽðÊôÔ­×Ó´ØÖл¹Ô­Î»µãµÄ·ÖÎö 285 Mutagenesis at ¦Á-423Ile of MoFe Protein Reduces the Catalytic Activity of Nitrogenase in Klebsiella oxytoca 294 ¦Á-Lys424 Participates in Insertion of FeMo-co to MoFe Protein and Maintains Nitrogenase Activity in Klebsiella oxytoca M5al 305 µÚ2²¿·Ö΢ÉúÎï´ÎÉú´úл²úÎïÑз¢¼°ÉúÎïºÏ³Éµ÷¿ØÑо¿ ±±¾©Å©Òµ´óѧµÄ³àùËØÑо¿¹¤×÷(¼ò±¨) 326 ³àùËØA4¡¢A7µÄ·¢½ÍÑо¿ 330 ³àùËØA9¼ì¶¨·½·¨µÄ½¨Á¢ºÍ·¢½ÍµÄ³õ²½Ñо¿ 337 ĪÄܾúËØÓ¦Óü¼Êõ 343 ͸Ã÷²ü¾úѪºìµ°°×»ùÒòÔÚ°¢Î¬Á´Ã¹¾úÖеıí´ï 345 °¢Î¬¾úËظ߲ú¾úÖêµÄÑ¡Óý¼°°¢Î¬¾úËØB1µÄ¼ø¶¨ 352 Avermectins·¢½ÍÅàÑø»ùµÄÑо¿ 358 °¢Î¬Á´Ã¹¾úÖÐaveD»ùÒòȱʧ¶Ô°¢Î¬¾úËغϳɵÄÓ°Ïì 366 Deletion Analysis of Oligomycin PKS Genes (olmA) in Streptomyces avermitilis 371 Construction of Ivermectin Producer by Domain Swaps of Avermectin Polyketide Synthase in Streptomyces avermitilis 380 An adpA Homologue in Streptomyces avermitilis is Involved in Regulation of Morphogenesis and Melanogenesis 392 Engineering of Avermectin Biosynthetic Genes to Improve Production of Ivermectin in Streptomyces avermitilis 403 Enhancement of Avermectin and Ivermectin Production by Overexpression of the Maltose ATP-binding Cassette Transporter in Streptomyces avermitilis 410 A New Strain of Streptomyces avermitilis Produces High Yield of Oligomycin A with Potent Anti-tumor Activity on Human Cancer Cell Lines in vitro 423 Chromosomal Instability in Streptomyces avermitilis: Major Deletion in the Central Region and Stable Circularized Chromosome 433 The Pathway-specific Regulator AveR from Streptomyces avermitilis Positively Regulates Avermectin Production while it Negatively Affects Oligomycin Biosynthesis 450 Increasing Avermectin Production in Streptomyces avermitilis by Manipulating the Expression of a Novel TetR-family Regulator and Its Target Gene Product 466 AvaR2£¬ a Pseudo ¦Ã-Butyrolactone Receptor Homologue from Streptomyces avermitilis£¬ is a Pleiotropic Repressor of Avermectin and Avenolide Biosynthesis and Cell Growth 490 SAV742£¬ a Novel AraC-Family Regulator from Streptomyces avermitilis£¬ Controls Avermectin Biosynthesis£¬ Cell Growth and Development 513 AvaR1£¬ a Butenolide-type Autoregulator Receptor in Streptomyces avermitilis£¬ Directly Represses Avenolide and Avermectin Biosynthesis and Multiple Physiological Responses 532 Redox-sensing Regulator Rex Regulates Aerobic Metabolism£¬ Morphological Differentiation£¬ and Avermectin Production in Streptomyces avermitilis 552 The PhoP Transcription Factor Negatively Regulates Avermectin Biosynthesis in Streptomyces avermitilis 568 IdeR£¬ a DtxR-family Iron-response Regulator£¬ Controls Iron Homeostasis£¬ Morphological Differentiation£¬ Secondary Metabolism£¬ and Oxidative Stress Response in Streptomyces avermitilis 583 AveI£¬ an AtrA Homolog of Streptomyces avermitilis£¬ Controls Avermectin and Oligomycin Production£¬ Melanogenesis£¬ and Morphological Differentiation 604 SufR£¬ a [4Fe-4S] Cluster-containing Transcription Factor£¬ Represses the sufRBDCSU Operon in Streptomyces avermitilis Iron-sulfur Cluster Assembly 621 The ROK-family Regulator Rok7B7 Directly Controls Carbon Catabolite Repression£¬ Antibiotic Biosynthesis£¬ and Morphological Development in Streptomyces avermitilis 642 AccR£¬ a TetR Family Tra