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  • 1.
    Ampomah, Osei Y.
    et al.
    KTH, Skolan för bioteknologi (BIO), Glykovetenskap.
    Jensen, J. B.
    The trehalose utilization gene thuA ortholog in Mesorhizobium loti does not influence competitiveness for nodulation on Lotus spp2014Ingår i: World Journal of Microbiology & Biotechnology, ISSN 0959-3993, E-ISSN 1573-0972, Vol. 30, nr 3, s. 1129-1134Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Competitiveness for nodulation is a desirable trait in rhizobia strains used as inoculant. In Sinorhizobium meliloti 1021 mutation in either of the trehalose utilization genes thuA or thuB influences its competitiveness for root colonization and nodule occupancy depending on the interacting host. We have therefore investigated whether mutation in the thuA ortholog in Mesorhizobium loti MAFF303099 also leads to a similar competitive phenotype on its hosts. The results show that M. loti thuA mutant Ml7023 was symbiotically effective and was as competitive as the wild type in colonization and nodule occupancy on Lotus corniculatus and Lotus japonicus. The thuA gene in M. loti was not induced during root colonization or in the infection threads unlike in S. meliloti, despite its induction by trehalose and high osmolarity in in vitro assays.

  • 2.
    Leta, Seyoum
    et al.
    KTH, Skolan för bioteknologi (BIO).
    Assefa, F.
    Dalhammar, Gunnel
    KTH, Skolan för bioteknologi (BIO), Miljömikrobiologi.
    Enhancing biological nitrogen removal from tannery effluent by using the efficient Brachymonas denitrificans in pilot plant operations2005Ingår i: World Journal of Microbiology & Biotechnology, ISSN 0959-3993, E-ISSN 1573-0972, Vol. 21, nr 4, s. 545-552Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Laboratory scale and pilot plant reactors were inoculated with an efficient denitrifier, Brachymonas denitrificans (CCUG 45880), in order to evaluate whether a bio-augmentation approach can be used to enhance biological nitrogen removal from tannery effluents. To determine the effectiveness of the introduced strain, denitrifying activity in the activated sludge was monitored by nitrate uptake rate ( NUR) measurement of NO3-N. Fluorescent in situ hybridization ( FISH) technique was used to monitor the growth of the augmented species. The laboratory scale nitrate removal efficiency with the introduced B. denitrificans (3.7 +/- 0.6 mg NO3-N gVSS(-1) h(-1)) was higher than that of the activated sludge without the addition of the bacteria (3.5 +/- 0.7 mg NO3-N gVSS(-1) h(-1)); the NUR in the pilot plant after and before the introduction of the strain was also of the magnitude of 12.0 +/- 1.4 and 10.6 +/- 1.4 mg NO3- N gVSS(-1) day(-1), respectively. In situ hybridization results revealed that the introduced denitrifying bacteria significantly facilitated the development of a dense denitrifying bacterial population in the activated sludge, which enhanced in situ denitrification activity. FISH data indicated that once introduced, B. denitrificans remained abundant throughout the experimental period. The ability to seed a bioreactor with bacterial strain capable of removing target pollutants from tannery effluents in a mixed microbial community suggests that this approach could have commercial applications.

  • 3.
    Leta, Seyoum
    et al.
    KTH, Tidigare Institutioner, Bioteknologi.
    Gumaelius, Lena
    KTH, Tidigare Institutioner, Bioteknologi.
    Assefa, F.
    Dalhammar, Gunnel
    KTH, Tidigare Institutioner, Bioteknologi.
    dentification of efficient denitrifying bacteria from tannery wastewaters in Ethiopia and a study of the effects of chromium III and sulphide on their denitrification rate2004Ingår i: World Journal of Microbiology & Biotechnology, ISSN 0959-3993, E-ISSN 1573-0972, Vol. 20, nr 4, s. 405-411Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In order to identify potential microorganisms with high denitrifying capacity from tannery wastewaters, 1000 pure cultures of bacterial isolates from Modjo Tannery Pilot and Ethio-tannery wastewater treatment plants (WWTP), in Ethiopia, were investigated. Twenty-eight isolates were selected as efficient denitrifiers. These were Gram-negative rods, oxidase and catalase positive denitrifying organisms. The 28 denitrifying strains were further classified according to their biochemical fingerprints into three different phylogenetic groups (BPT1, BPT2 and BPT3) and seven singles. Isolates B79(T), B11, B12, B15, B28 and B38 belonging to the BPT3 cluster were found to be the most efficient denitrifying bacteria. All phenotypic studies, including cellular fatty acid profiles, showed that the 6 BPT3 isolates were closely related to each other. The 16S rRNA partial sequence analysis of type strain B79(T) (CCUG 45880) indicated a sequence similarity of 99% to Brachymonas denitrificans JCM9216 (D14320) in the beta-subdivision of proteobacteria. Further studies of the effects of chromium III and sulphide on the six Brachymonas denitrificans strains indicated that denitrification by the isolates were inhibited 50% at concentrations of 54 and 96 mg/l, respectively. The efficient isolates characterized in this study are of great value because of their excellent denitrifying properties and relatively high tolerance to the concentrations of toxic compounds (70 mg chromium/l and 160 mg sulphide/l) prevailing in tannery wastewaters.

  • 4.
    Marobhe, Nancy
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik.
    Dalhammar, Gunnel
    KTH, Skolan för bioteknologi (BIO), Miljömikrobiologi.
    Kuttuva, Gunaratna R.
    KTH, Skolan för bioteknologi (BIO), Miljömikrobiologi.
    Effect of coagulant protein from Vigna and Parkinsonia seeds on bacteria isolated from Ruvu River in Tanzania2008Ingår i: World Journal of Microbiology & Biotechnology, ISSN 0959-3993, E-ISSN 1573-0972Artikel i tidskrift (Övrigt vetenskapligt)
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