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1.
Genetika ; 47(7): 879-89, 2011 Jul.
Artigo em Russo | MEDLINE | ID: mdl-21938951

RESUMO

Radiation resistance of Escherichia coil cells depends on how efficiently DNA is recovered after damage, which is determined by the function of constitutive and inducible repair branches. The effects of additional mutations of the key genes of constitutive and inducible repair (recA, lexA, recB, polA, lig, gyr, recE, recO, recR, recJ, recQ, uvrD, helD, recN, and ruv) on radiation resistance were studied in E. coli K-12 strain AB 1157 and highly radiation-resistant isogenic strain Gam(r)444. An optimal balance ensuring a high gamma resistance of the Gam(r)444 radiation-resistant E. coli mutant was due to expression of the key SOS repair genes (recA, lexA, recN, and ruv) and activation of the presynaptic functions of the RecF homologous recombination pathway as a result of a possible mutation of the uvrD gene, which codes for repair helicase II.


Assuntos
DNA Bacteriano/metabolismo , Escherichia coli K12/metabolismo , Proteínas de Escherichia coli/metabolismo , Raios gama , Regulação Bacteriana da Expressão Gênica/efeitos da radiação , Tolerância a Radiação/fisiologia , Resposta SOS em Genética/efeitos da radiação , DNA Bacteriano/genética , Escherichia coli K12/genética , Proteínas de Escherichia coli/genética , Regulação Bacteriana da Expressão Gênica/fisiologia , Mutação , Resposta SOS em Genética/fisiologia
2.
Klin Lab Diagn ; (8): 46-7, 2007 Aug.
Artigo em Russo | MEDLINE | ID: mdl-17915484

RESUMO

The paper discusses the functional activity of peripheral neutrophilic granulocytes in 25 patients with autoimmune thyroiditis (AIT). The course of the latter is shown to be attended by a reduction in serum lactoferrin levels with simultaneous increases in the production of active oxygen forms and in the blood count of CD95+ granulocytes.


Assuntos
Neutrófilos/imunologia , Tireoidite Autoimune/imunologia , Adulto , Apoptose , Feminino , Humanos , Lactoferrina/sangue , Masculino , Pessoa de Meia-Idade , Espécies Reativas de Oxigênio/metabolismo , Receptor fas/imunologia
10.
Artigo em Russo | MEDLINE | ID: mdl-354287

RESUMO

Investigations carried out demonstrated a possibility of transmission of plasmid Rldrd19 from E. coli to Hafnia. The incidence of the plasmid transmission varied from 10(-7) to 10(-9) and depended on the properfies of Hafnia strains. Tra-operon of plasmid Rldrd19 in the Hafnia 614 strain functioned with the same efficacy as in E. coli. Plasmid Rldrd19 in Hafnia was unstable and was eliminated from the cells in case of storage at low temperatures. As shown, plasmid Rldrd19 was under strict replication control in Hafnia as in E. coli. Formation of the CCC-form of the plasmid Rldrd19 was suppressed in Hafnia at 29--30 degrees C and was not suppressed in E. coli.


Assuntos
Conjugação Genética , Enterobacteriaceae/genética , Escherichia coli/genética , Fatores R , Cloranfenicol/farmacologia , Replicação do DNA , DNA Bacteriano/biossíntese , Enterobacteriaceae/metabolismo , Escherichia coli/metabolismo , Canamicina/farmacologia , Especificidade da Espécie , Temperatura
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