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  • 1.
    Dalusi, Lucy
    et al.
    Amana Regional Referral Hospital, Dar es Salaam, Tanzania / University of Dar es Salaam, Dar es Salaam, Tanzania.
    Lyimo, Thomas J
    University of Dar es Salaam, Dar es Salaam, Tanzania.
    Lugomela, Charles
    University of Dar es Salaam, Dar es Salaam, Tanzania.
    Hosea, Ken M M
    University of Dar es Salaam, Dar es Salaam, Tanzania.
    Sjöling, Sara
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Biology.
    Toxigenic Vibrio cholerae identified in estuaries of Tanzania using PCR techniques2015In: FEMS Microbiology Letters, ISSN 0378-1097, E-ISSN 1574-6968, Vol. 362, no 5, article id fnv009Article in journal (Refereed)
    Abstract [en]

    The current study assessed the occurrence of the Vibrio cholerae serogroups O1 and O139 in environmental samples along salinity gradients in three selected estuaries of Tanzania both through culture independent methods and by cultured bacteria. Occurrence of V. cholerae was determined by PCR targeting the V. cholerae outer membrane protein gene ompW. Furthermore, the presence of toxigenic strains and serogroups O1 and O139 was determined using multiplex PCR with specific primers targeting the cholera toxin gene subunit A, ctxA, and serotype specific primers, O1-rfb and O139-rfb, respectively. Results showed that V. cholerae occurred in approximately 10% (n = 185) of both the environmental samples and isolated bacteria. Eight of the bacteria isolates (n = 43) were confirmed as serogroup O1 while one belonged to serogroup O139, the first reported identification of this epidemic strain in East African coastal waters. All samples identified as serogroup O1 or O139 and a number of non-O1/O139 strains were ctxA positive. This study provides in situ evidence of the presence of pathogenic V. cholerae O1 and O139 and a number of V. cholerae non-O1/O139 that carry the cholera toxin gene in estuaries along the coast of Tanzania.

  • 2.
    Rahman, Mokhlasur
    et al.
    Södertörn University, School of Life Sciences.
    Simm, Roger
    Kader, Abdul
    Basseres, Eugenie
    Romling, Ute
    Mollby, Roland
    The role of c-di-GMP signaling in an Aeromonas veronii biovar sobria strain2007In: FEMS Microbiology Letters, ISSN 0378-1097, E-ISSN 1574-6968, Vol. 273, no 2, p. 172-179Article in journal (Refereed)
    Abstract [en]

    Aeromonas is a ubiquitous gram-negative bacterium that persists in the environment. It is shown that all isolates of persistent Aeromonas clones show strong biofilm formation ability. C-di-GMP regulates biofilm formation in many bacteria. To investigate the impact of c-di-GMP signaling, we introduced heterologous GGDEF and EAL domain proteins from Salmonella Typhimurium to an Aeromonas veronii biovar sobria strain. Overexpression of the GGDEF domain protein AdrA increased c-di-GMP concentration and biofilm formation and reduced motility. Production of the quorum-sensing signaling molecule C4-homoserine lactone and adhesion to aquatic plant duckweed and amoeba surfaces were enhanced. On the other hand, overexpression of the EAL domain protein YhjH decreased biofilm formation and increased motility.

  • 3.
    Wouters, Johanna
    et al.
    Department of Biology and Environmental Science, University of Kalmar.
    Bergman, Birgitta
    Department of Botany, Stockholm University.
    Janson, Sven
    Department of Biology and Environmental Science, University of Kalmar.
    Cloning and expression of a putative cyclodextrin glucosyltransferase from the symbiotically competent cyanobacterium Nostoc sp PCC 92292003In: FEMS Microbiology Letters, ISSN 0378-1097, E-ISSN 1574-6968, Vol. 219, no 2, p. 181-185Article in journal (Refereed)
    Abstract [en]

    A polymerase chain reaction-based method was used to isolate a Nostoc sp. PCC 9229 cDNA from infected glands of Gunnera chilensis. The complete gene sequence was isolated from a genomic Nostoc sp. PCC 9229 library. Sequence analysis showed 84% amino acid similarity to a putative cyclodextrin glycosyltransferase from Nostoc sp. PCC 7120 and the gene was therefore termed cgt. Southern blot revealed that the cgt gene was present in symbiotically competent cyanobacteria. The cgt gene was expressed in free-living nitrogen-fixing cultures in light or in darkness when supplemented with fructose. This is the first expression analysis of a cgt gene from a cyanobacterium. (C) 2003 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.

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