Browsing by Autor "Bo Mattìasson"

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A toxaphene-degrading bacterium related to Enterobacter cloacae, strain D1 isolated from aged contaminated soil in Nicaragua
(Elsevier BV, 2005) Martha Lacayo-Romero; Jorge Quillaguamán; Bert van Bavel; Bo Mattìasson
Azo dye decolorization by a laccase/mediator system in a membrane reactor: Enzyme and mediator reusability
(Elsevier BV, 2011) Laura Mendoza; Maria Jonstrup; Rajni Hatti‐Kaul; Bo Mattìasson
Bacillus bogoriensis sp. nov., a novel alkaliphilic, halotolerant bacterium isolated from a Kenyan soda lake
(Microbiology Society, 2005) Virginia A. Vargas; Osvaldo D. Delgado; Rajni Hatti‐Kaul; Bo Mattìasson
Strain LBB3(T) isolated from Bogoria soda lake in Kenya is an alkaliphilic, Gram-positive, strictly aerobic, non-motile, spore-forming bacterium. It was identified as a member of the genus Bacillus on the basis of phenotypic and phylogenetic analyses. The organism grows optimally at 37 degrees C and pH 10. The G+C content of the genomic DNA is 37.5 mol%. 16S rRNA gene sequence analysis showed 95 and 96 % sequence similarity with Bacillus pseudofirmus (DSM 8715(T)) and Bacillus alcalophilus (DSM 485(T)), respectively. Furthermore, DNA-DNA hybridization against these two Bacillus species showed 39.0 and 55.5 % similarity, respectively. Based on our observations, strain LBB3(T) is proposed to represent a novel species of the genus Bacillus, for which the name Bacillus bogoriensis sp. nov. is proposed. The type strain of B. bogoriensis is LBB3(T) (=ATCC BAA-922(T)=LMG 22234(T)).
Bioimprinting as a tool for the detection of aflatoxin B1 using a capacitive biosensor
(Elsevier BV, 2016) Alvaro V. Gutierrez R.; Martin Hedström; Bo Mattìasson
Biopolyester Production: Halophilic Microorganisms as an Attractive Source
(2005) Jorge Quillaguamán; Bo Mattìasson; Rajni Hatti‐Kaul
Caloramator boliviensis sp. nov., a thermophilic, ethanol-producing bacterium isolated from a hot spring
(Microbiology Society, 2011) Carla Crespo; Tania Pozzo; Eva Nordberg Karlsson; María Teresa Álvarez; Bo Mattìasson
A novel moderately thermophilic, anaerobic, ethanol-producing bacterial strain, 45B(T), was isolated from a mixed sediment water sample collected from a hot spring at Potosi, Bolivia. The cells were straight to slightly curved rods approximately 2.5 µm long and 0.5 µm wide. The strain was Gram-stain-variable, spore-forming and monotrichously flagellated. Growth of the strain was observed at 45-65 °C and pH 5.5-8.0, with optima of 60 °C and pH 6.5. The substrates utilized by strain 45B(T) were xylose, cellobiose, glucose, arabinose, sucrose, lactose, maltose, fructose, galactose, mannose, glycerol, xylan, carboxymethylcellulose and yeast extract. The main fermentation product from xylose and cellobiose was ethanol (0.70 and 0.45 g ethanol per gram of consumed sugar, respectively). Acetate, lactate, propionate, carbon dioxide and hydrogen were also produced in minor quantities. 1,3-Propanediol was produced when glycerol-containing medium was supplemented with yeast extract. The major cellular fatty acids were anteiso-C(15:0), C(16:0), iso-C(16:0), C(15:1), iso-C(14:0), C(13:0) and C(14:0). The polar lipids diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, an aminoglycolipid and 15 other unidentified lipids were predominant. The DNA G+C content of strain 45B(T) was 32.6 mol%. Phylogenetic analysis based on 16S rRNA gene sequence similarity revealed that strain 45B(T) is located within the Gram-type positive Bacillus-Clostridium branch of the phylogenetic tree. On the basis of morphological and physiological properties and phylogenetic analysis, strain 45B(T) represents a novel species, for which the name Caloramator boliviensis sp. nov. is proposed; the type strain is 45B(T) (=DSM 22065(T)=CCUG 57396(T)).
Chemo-enzymatic epoxidation of oleic acid and methyl oleate in solvent-free medium
(Taylor & Francis, 2005) Cecilia Orellana‐Coca; Ulrika Törnvall; Dietlind Adlercreutz; Bo Mattìasson; Rajni Hatti‐Kaul
Chemo-enzymatic epoxidation of oleic acid (OA) and its methyl ester has been performed using hydrogen peroxide and immobilized lipase from Candida antarctica (Novozym® 435). The purpose of the study was to characterize the reaction under solvent-free conditions. The reaction temperature had a significant impact on epoxidation of OA. At lower temperatures, the substrate conversion was hindered by the formation of solid epoxystearic acid product. Nearly 90% conversion of OA to the epoxide product was obtained after 6 h at 50°C. Longer reaction times at 40°C and above resulted in by-product formation and eventually lowered the product yield. In contrast, the reaction with methyl oleate (MO) was less influenced by temperature. Almost complete epoxidation was achieved at 40–60°C; the higher the temperature the shorter was the reaction time. The main epoxidation product obtained was epoxystearic acid methyl ester (EME), and the remaining was epoxystearic acid (EA) formed by the hydrolytic action of the lipase. Recycling of the lipase for epoxidation of MO at 50°C indicated that the immobilized enzyme was prone to activity loss.
Chromohalobacter sarecensis sp. nov., a psychrotolerant moderate halophile isolated from the saline Andean region of Bolivia
(Microbiology Society, 2004) Jorge Quillaguamán; Osvaldo D. Delgado; Bo Mattìasson; Rajni Hatti‐Kaul
A moderately halophilic, aerobic, motile, Gram-negative, rod-shaped bacterium (strain LV4(T)) was isolated from saline soil around the lake Laguna Verde in the Bolivian Andes. The organism is a heterotroph, able to utilize various carbohydrates as a carbon source. It showed tryptophan deaminase, oxidase and catalase activity, but was unable to produce indole or H(2)S; nitrate was not reduced. The G+C content of the genomic DNA was 56.1 mol%. The pH range for growth was 5-10, temperature range was 0-45 degrees C and the range of NaCl concentrations was 0-25 % (w/v). On the basis of 16S rRNA gene sequence analysis, strain LV4(T) was found to be closely related to Chromohalobacter canadensis DSM 6769(T) and Pseudomonas beijerinckii DSM 7218(T); however, its DNA-DNA relatedness with these type strains was low. Strain LV4(T) resembled other Chromohalobacter species with respect to various physiological, biochemical and nutritional characteristics but also exhibited differences. Thus, a novel species, Chromohalobacter sarecensis sp. nov., is proposed, with LV4(T) (=CCUG 47987(T)=ATCC BAA-761(T)) as the type strain.
Degradation of toxaphene by Bjerkandera sp. strain BOL13 using waste biomass as a cosubstrate
(Springer Science+Business Media, 2005) Martha Lacayo Romero; Enrique Terrazas; Bert van Bavel; Bo Mattìasson
Enhancement of Sulphide Production in Anaerobic Packed Bed Bench-scale Biofilm Reactors by Sulphate Reducing Bacteria
(Springer Science+Business Media, 2006) María Teresa Álvarez; Tania Pozzo; Bo Mattìasson
Halomonas boliviensis sp. nov., an alkalitolerant, moderate halophile isolated from soil around a Bolivian hypersaline lake
(Microbiology Society, 2004) Jorge Quillaguamán; Rajni Hatti‐Kaul; Bo Mattìasson; María Teresa Álvarez; Osvaldo D. Delgado
Halomonas boliviensis sp. nov. is proposed for two moderately halophilic, psychrophilic, alkalitolerant bacteria, LC1(T) (=DSM 15516(T)=ATCC BAA-759(T)) and LC2 (=DSM 15517=ATCC BAA-760), both of which were isolated from a soil sample around the lake Laguna Colorada, located at 4300 m above sea level in the south-west region of Bolivia. The bacteria are aerobic, motile, Gram-negative rods that produce colonies with a cream pigment. Moreover, they are heterotrophs that are able to utilize various carbohydrates as carbon sources. The organisms reduce nitrate and show tryptophan deaminase activity. The genomic DNA G+C contents were 51.4 mol% for isolate LC1(T) and 52.6 mol% for isolate LC2. Based on 16S rDNA sequence analysis, isolates LC1(T) and LC2 were identified as members of the genus Halomonas and clustered closely with Halomonas variabilis DSM 3051(T) and Halomonas meridiana DSM 5425(T). However, DNA-DNA relatedness between the new isolates and the closest related Halomonas species was low.
Isolation and characterization of a white rot fungus Bjerkandera sp. strain capable of oxidizing phenanthrene
(Springer Science+Business Media, 2005) Enrique Terrazas-Siles; Teresa Alvarez; Benoı̂t Guieysse; Bo Mattìasson
Lab-scale production of biogenic sulphide for metal precipitation in remote areas
(Inderscience Publishers, 2012) María Teresa Álvarez; Britt‐Marie Pott; Georgina Chávez; Alberto Giménez; Rajni Hatti Kaul; Bo Mattìasson
Batch cultures with wheat straw, biomass of Paja Brava ( Festuca orthophylla ), filter paper, newspaper and beech leaves ( Fagus sylvatica ) were established to produce sulphide. Sulphide production, sulphate reduction, concentration of Volatile Fatty Acids (VFAs), enzyme activities and Fluorescence in situ hybridisation were determined. Approximately 5 mM of sulphide was produced during anaerobic digestion of wheat straw, while the production with newspaper as carbon source was the lowest (ca.1 mM). The sulphide production (2–5 mM) in the semi-continuous culture of the consortium A10, using wheat straw supported Cu(II), Pb (II) and Zn (II) removal up to 90%.
Lipase mediated simultaneous esterification and epoxidation of oleic acid for the production of alkylepoxystearates
(Elsevier BV, 2006) Cecilia Orellana‐Coca; Jagan Billakanti; Bo Mattìasson; Rajni Hatti‐Kaul
Microcultivation of anaerobic bacteria single cells entrapped in alginate microbeads
(Springer Science+Business Media, 2012) Rosa Aragão Börner; María Teresa Álvarez Aliaga; Bo Mattìasson
Poly(<i>β</i>-hydroxybutyrate) production by a moderate halophile,<i>Halomonas boliviensis</i>LC1 using starch hydrolysate as substrate
(Oxford University Press, 2005) Jorge Quillaguamán; Suhaila O. Hashim; Fátima Bento; Bo Mattìasson; Rajni Hatti‐Kaul
There have been no reports related to PHB production amongst the members of the genus Halomonas. The use of a maltooligosaccharide forming alpha-amylase, which is active at a temperature and pH close to that required for growth of H. boliviensis, and the versatility of this bacterium in the selection of the carbon source may provide an attractive alternative for the utilization of starch-derived raw materials.
Poly(β-hydroxybutyrate) production by a moderate halophile, Halomonas boliviensis LC1
(Elsevier BV, 2005) Jorge Quillaguamán; Osvaldo D. Delgado; Bo Mattìasson; Rajni Hatti‐Kaul
Precipitation of Zn(II), Cu(II) and Pb(II) at bench-scale using biogenic hydrogen sulfide from the utilization of volatile fatty acids
(Elsevier BV, 2006) María Teresa Álvarez; Carla Crespo; Bo Mattìasson
Screening of self-assembled monolayer for aflatoxin B1 detection using immune-capacitive sensor
(Elsevier BV, 2015) Alvaro V. Gutierrez R.; Martin Hedström; Bo Mattìasson
Sequential removal of heavy metals ions and organic pollutants using an algal-bacterial consortium
(Elsevier BV, 2005) Raúl Muñoz; María Teresa Álvarez; Adriana Muñoz; Enrique Terrazas; Benoı̂t Guieysse; Bo Mattìasson