Nature, Količina 260Sir Norman Lockyer Macmillan Journals Limited, 1976 |
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Zadetki 1–3 od 56
Stran 42
... coli bearing temperature - sensitive chloramphenicol - resistant R plasmid pSL222-6 were introduced into a cage of 18 chickens previously fed tetracycline and excreting tetracycline - resistant E. coli . Spread of Nal® E. coli was ...
... coli bearing temperature - sensitive chloramphenicol - resistant R plasmid pSL222-6 were introduced into a cage of 18 chickens previously fed tetracycline and excreting tetracycline - resistant E. coli . Spread of Nal® E. coli was ...
Stran 73
... coli RNA polymerase into polycistronic tRNA precursors . These precursors were cleaved on incubation with a supernatant fraction from E. coli , yielding mature size tRNA molecules1 . The transcription in vitro of an active tRNA , su3 + ...
... coli RNA polymerase into polycistronic tRNA precursors . These precursors were cleaved on incubation with a supernatant fraction from E. coli , yielding mature size tRNA molecules1 . The transcription in vitro of an active tRNA , su3 + ...
Stran 260
... coli. as 1 mg ( NH4 ) 2SO4 per ml , a nitrogen source which represses nitrogenase synthesis in Klebsiella . When RP41 was trans- ferred back to E. coli , several exconjugants were Nif + , con- firming that K. pneumoniae nif genes had ...
... coli. as 1 mg ( NH4 ) 2SO4 per ml , a nitrogen source which represses nitrogenase synthesis in Klebsiella . When RP41 was trans- ferred back to E. coli , several exconjugants were Nif + , con- firming that K. pneumoniae nif genes had ...
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Acad accepted January acid activity adenylate cyclase animals antigen Applications are invited appointment assay axon basalts binding Biochem Biochemistry Biol Biology blastula brain Cancer cDNA cells chemical Chemistry chromosome coli concentration containing cultures cyclic AMP cytoplasm Department edit effect electron enzyme exconjugants exotoxin experience fibroblasts field ganglion gene genetic globin helper cells HnRNA human hybridisation increase incubated inhibition injected interferon Laboratory Lecturer London lymphocytes mechanism membrane ment mice molecular molecules mRNA muscle mutant natn Nature nerve neurones normal nuclear nucleotide observed obtained oocytes Physics Physiol plasmid potential Proc produced protein Reader Enquiry receptors referees region response reverse transcriptase ribosomes Salary samples Science sequences serum solar specific stimulation structure studies substantia nigra suggest surface synthesis Table tion tissue tRNA tumour University virus viruses vitro York