| reduction of ferric green rust by shewanella putrefaciens. | to reduce carbonated ferric green rust (gr*) using an iron respiring bacterium and obtain its reduced homologue, the mixed fe(ii)-fe(iii) carbonated green rust (gr). | 2007 | 17868312 |
| siderophore-mediated iron sequestering by shewanella putrefaciens. | the iron-sequestering abilities of 51 strains of shewanella putrefaciens isolated from different sources (fish, water, and warm-blooded animals) were assessed. thirty strains (60%) produced siderophores in heat-sterilized fish juice as determined by the chrome-azurol-s assay. all cultures were negative for the catechol-type siderophore, whereas 24 of the 30 siderophore-producing strains tested positive in the csáky test, indicating the production of siderophores of the hydroxamate type. sideroph ... | 1994 | 16349298 |
| characterization of the arsenate respiratory reductase from shewanella sp. strain ana-3. | microbial arsenate respiration contributes to the mobilization of arsenic from the solid to the soluble phase in various locales worldwide. to begin to predict the extent to which as(v) respiration impacts arsenic geochemical cycling, we characterized the expression and activity of the shewanella sp. strain ana-3 arsenate respiratory reductase (arr), the key enzyme involved in this metabolism. arr is expressed at the beginning of the exponential phase and persists throughout the stationary phase ... | 2008 | 17951391 |
| characterization of the arsenate respiratory reductase from shewanella sp. strain ana-3. | microbial arsenate respiration contributes to the mobilization of arsenic from the solid to the soluble phase in various locales worldwide. to begin to predict the extent to which as(v) respiration impacts arsenic geochemical cycling, we characterized the expression and activity of the shewanella sp. strain ana-3 arsenate respiratory reductase (arr), the key enzyme involved in this metabolism. arr is expressed at the beginning of the exponential phase and persists throughout the stationary phase ... | 2008 | 17951391 |
| cerebellar abscess and meningitis, caused by shewanella putrefaciens and klebsiella pneumoniae, associated with chronic otitis media. | shewanella putrefaciens is a facultatively anaerobic, non-motile, gram-negative, non-fermentative bacterium. it is found in various environments and has been isolated worldwide. s. putrefaciens is a rare cause of brain abscesses and meningitis. this is a case report of a cerebellar abscess and meningitis caused by shewanella putrefaciens and klebsiella pneumoniae in a river trap fisherman. | 2007 | 17965359 |
| shewanella putrefaciens keratitis in the lamellar bed 6 years after lasik. | to present a case of infectious keratitis occurring 6 years after lasik due to the rare human pathogen shewanella putrefaciens. | 2007 | 17985805 |
| mixed-valence cytoplasmic iron granules are linked to anaerobic respiration. | intracellular granules containing ferric and ferrous iron formed in shewanella putrefaciens cn32 during dissimilatory reduction of solid-phase ferric iron. it is the first in situ detection at high resolution (150 nm) of a mixed-valence metal particle residing within a prokaryotic cell. the relationship of the internal particles to fe(iii) reduction may indicate a respiratory role. | 2007 | 17142380 |
| shelf-life of chilled fresh mediterranean swordfish (xiphias gladius) stored under various packaging conditions: microbiological, biochemical and sensory attributes. | the present work evaluated the effect of air, vacuum and modified atmosphere packaging (map) on the shelf-life of chilled mediterranean swordfish (xiphias gladius). fresh swordfish slices were stored in air, under vacuum and map (40%/30%/30%, co(2)/n(2)/o(2)) under refrigeration (4 degrees c) for a period of 16 days. of the three treatments used (vacuum, map and air), both map and vacuum packaging (vp) were the most effective for inhibiting growth of aerobic microflora in swordfish samples until ... | 2008 | 17993387 |
| growth with high planktonic biomass in shewanella oneidensis fuel cells. | shewanella oneidensis mr-1 grew for over 50 days in microbial fuel cells, incompletely oxidizing lactate to acetate with high recovery of the electrons derived from this reaction as electricity. electricity was produced with lactate or hydrogen and current was comparable to that of electricigens which completely oxidize organic substrates. however, unlike fuel cells with previously described electricigens, in which cells are primarily attached to the anode, at least as many of the s. oneidensis ... | 2008 | 17995953 |
| growth with high planktonic biomass in shewanella oneidensis fuel cells. | shewanella oneidensis mr-1 grew for over 50 days in microbial fuel cells, incompletely oxidizing lactate to acetate with high recovery of the electrons derived from this reaction as electricity. electricity was produced with lactate or hydrogen and current was comparable to that of electricigens which completely oxidize organic substrates. however, unlike fuel cells with previously described electricigens, in which cells are primarily attached to the anode, at least as many of the s. oneidensis ... | 2008 | 17995953 |
| mixed-valence cytoplasmic iron granules are linked to anaerobic respiration. | intracellular granules containing ferric and ferrous iron formed in shewanella putrefaciens cn32 during dissimilatory reduction of solid-phase ferric iron. it is the first in situ detection at high resolution (150 nm) of a mixed-valence metal particle residing within a prokaryotic cell. the relationship of the internal particles to fe(iii) reduction may indicate a respiratory role. | 2007 | 17142380 |
| the influence of cultivation methods on shewanella oneidensis physiology and proteome expression. | high-throughput analyses that are central to microbial systems biology and ecophysiology research benefit from highly homogeneous and physiologically well-defined cell cultures. while attention has focused on the technical variation associated with high-throughput technologies, biological variation introduced as a function of cell cultivation methods has been largely overlooked. this study evaluated the impact of cultivation methods, controlled batch or continuous culture in bioreactors versus s ... | 2008 | 18030449 |
| the influence of cultivation methods on shewanella oneidensis physiology and proteome expression. | high-throughput analyses that are central to microbial systems biology and ecophysiology research benefit from highly homogeneous and physiologically well-defined cell cultures. while attention has focused on the technical variation associated with high-throughput technologies, biological variation introduced as a function of cell cultivation methods has been largely overlooked. this study evaluated the impact of cultivation methods, controlled batch or continuous culture in bioreactors versus s ... | 2008 | 18030449 |
| microflora assessments using pcr-denaturing gradient gel electrophoresis of ozone-treated and modified-atmosphere-packaged farmed cod fillets. | denaturing gradient gel electrophoresis (dgge) of a pcr-amplified 16s rdna sequence was used to characterize changes in the microbial flora caused by ozone (o3) treatment of farmed cod (gadus morhua). portions of cod were produced under controlled conditions, bathed in fresh water supplemented with 2 ppm of o3 for 30 min, and packaged in modified atmosphere (ma: 60% co2 and 40% n2) before 4 degrees c storage. control samples were packaged in ma or air, without prior o3 treatment. samples were an ... | 2007 | 18044421 |
| axial coordination of heme in ferric ccme chaperone characterized by epr spectroscopy. | in escherichia coli cytochrome c maturation requires a set of eight proteins including the heme chaperone ccme, which binds heme transiently, yet covalently. several variants of ccme were purified and analyzed by continuous-wave electron paramagnetic resonance, electron nuclear double resonance, and hyperfine sublevel correlation spectroscopy to investigate the heme axial coordination. results reveal the presence of a number of coordination environments, two high-spin heme centers with different ... | 2007 | 17142277 |
| secretion of flavins by shewanella species and their role in extracellular electron transfer. | fe(iii)-respiring bacteria such as shewanella species play an important role in the global cycle of iron, manganese, and trace metals and are useful for many biotechnological applications, including microbial fuel cells and the bioremediation of waters and sediments contaminated with organics, metals, and radionuclides. several alternative electron transfer pathways have been postulated for the reduction of insoluble extracellular subsurface minerals, such as fe(iii) oxides, by shewanella specie ... | 2008 | 18065612 |
| secretion of flavins by shewanella species and their role in extracellular electron transfer. | fe(iii)-respiring bacteria such as shewanella species play an important role in the global cycle of iron, manganese, and trace metals and are useful for many biotechnological applications, including microbial fuel cells and the bioremediation of waters and sediments contaminated with organics, metals, and radionuclides. several alternative electron transfer pathways have been postulated for the reduction of insoluble extracellular subsurface minerals, such as fe(iii) oxides, by shewanella specie ... | 2008 | 18065612 |
| significance of antioxidative functions of eicosapentaenoic and docosahexaenoic acids in marine microorganisms. | | 2008 | 18065628 |
| significance of antioxidative functions of eicosapentaenoic and docosahexaenoic acids in marine microorganisms. | | 2008 | 18065628 |
| axial coordination of heme in ferric ccme chaperone characterized by epr spectroscopy. | in escherichia coli cytochrome c maturation requires a set of eight proteins including the heme chaperone ccme, which binds heme transiently, yet covalently. several variants of ccme were purified and analyzed by continuous-wave electron paramagnetic resonance, electron nuclear double resonance, and hyperfine sublevel correlation spectroscopy to investigate the heme axial coordination. results reveal the presence of a number of coordination environments, two high-spin heme centers with different ... | 2007 | 17142277 |
| utilization of dna as a sole source of phosphorus, carbon, and energy by shewanella spp.: ecological and physiological implications for dissimilatory metal reduction. | the solubility of orthophosphate (po4(3-)) in iron-rich sediments can be exceedingly low, limiting the bioavailability of this essential nutrient to microbial populations that catalyze critical biogeochemical reactions. here we demonstrate that dissolved extracellular dna can serve as a sole source of phosphorus, as well as carbon and energy, for metal-reducing bacteria of the genus shewanella. shewanella oneidensis mr-1, shewanella putrefaciens cn32, and shewanella sp. strain w3-18-1 all grew w ... | 2008 | 18156329 |
| utilization of dna as a sole source of phosphorus, carbon, and energy by shewanella spp.: ecological and physiological implications for dissimilatory metal reduction. | the solubility of orthophosphate (po4(3-)) in iron-rich sediments can be exceedingly low, limiting the bioavailability of this essential nutrient to microbial populations that catalyze critical biogeochemical reactions. here we demonstrate that dissolved extracellular dna can serve as a sole source of phosphorus, as well as carbon and energy, for metal-reducing bacteria of the genus shewanella. shewanella oneidensis mr-1, shewanella putrefaciens cn32, and shewanella sp. strain w3-18-1 all grew w ... | 2008 | 18156329 |
| shewanella oneidensis mr-1 fluxome under various oxygen conditions. | the central metabolic fluxes of shewanella oneidensis mr-1 were examined under carbon-limited (aerobic) and oxygen-limited (microaerobic) chemostat conditions, using 13c-labeled lactate as the sole carbon source. the carbon labeling patterns of key amino acids in biomass were probed using both gas chromatography-mass spectrometry (gc-ms) and 13c nuclear magnetic resonance (nmr). based on the genome annotation, a metabolic pathway model was constructed to quantify the central metabolic flux distr ... | 2007 | 17098921 |
| characterization of a filamentous biofilm community established in a cellulose-fed microbial fuel cell. | microbial fuel cells (mfcs) are devices that exploit microorganisms to generate electric power from organic matter. despite the development of efficient mfc reactors, the microbiology of electricity generation remains to be sufficiently understood. | 2008 | 18186940 |
| shewanella oneidensis mr-1 fluxome under various oxygen conditions. | the central metabolic fluxes of shewanella oneidensis mr-1 were examined under carbon-limited (aerobic) and oxygen-limited (microaerobic) chemostat conditions, using 13c-labeled lactate as the sole carbon source. the carbon labeling patterns of key amino acids in biomass were probed using both gas chromatography-mass spectrometry (gc-ms) and 13c nuclear magnetic resonance (nmr). based on the genome annotation, a metabolic pathway model was constructed to quantify the central metabolic flux distr ... | 2007 | 17098921 |
| toward a more robust assessment of intraspecies diversity, using fewer genetic markers. | phylogenetic sequence analysis of single or multiple genes has dominated the study and census of the genetic diversity among closely related bacteria. it remains unclear, however, how the results based on a few genes in the genome correlate with whole-genome-based relatedness and what genes (if any) best reflect whole-genome-level relatedness and hence should be preferentially used to economize on cost and to improve accuracy. we show here that phylogenies of closely related organisms based on t ... | 2006 | 16980418 |
| [purification and properties of an antimicrobial substance from marine brevibacillus laterosporus lh-1]. | an antimicrobial substance produced by brevibacillus laterosporus isolated from the sea sediment was purified and characterized. the antimicrobial substance was purified by ultrafiltration, deae-sepharose fast flow chromatography, cm-sepharose fast flow chromatography and hplc reversed phase column chromatography, and after the final purification step, one active fraction was obtained, designated r-1. the molecular weight (mw) was accurately determined by maldi-tof-ms as 1608.023 da. and its pi ... | 2007 | 18271253 |
| influence of storage temperature on microbial spoilage characteristics of haddock fillets (melanogrammus aeglefinus) evaluated by multivariate quality prediction. | the proliferation of specific spoilage organisms (sso) and quality changes were evaluated in haddock fillets stored in styrofoam boxes at 0, 7 and 15 degrees c and under temperature fluctuations. a rapid electronic nose technique was used to monitor different classes of compounds, representing microbial metabolites that were characteristic for the onset of spoilage odors. photobacterium phosphoreum predominated among the spoilage bacteria and high levels of tvb-n were observed at sensory rejecti ... | 2006 | 16889858 |
| c-type cytochrome-dependent formation of u(iv) nanoparticles by shewanella oneidensis. | modern approaches for bioremediation of radionuclide contaminated environments are based on the ability of microorganisms to effectively catalyze changes in the oxidation states of metals that in turn influence their solubility. although microbial metal reduction has been identified as an effective means for immobilizing highly-soluble uranium(vi) complexes in situ, the biomolecular mechanisms of u(vi) reduction are not well understood. here, we show that c-type cytochromes of a dissimilatory me ... | 2006 | 16875436 |
| shewanella secretes flavins that mediate extracellular electron transfer. | bacteria able to transfer electrons to metals are key agents in biogeochemical metal cycling, subsurface bioremediation, and corrosion processes. more recently, these bacteria have gained attention as the transfer of electrons from the cell surface to conductive materials can be used in multiple applications. in this work, we adapted electrochemical techniques to probe intact biofilms of shewanella oneidensis mr-1 and shewanella sp. mr-4 grown by using a poised electrode as an electron acceptor. ... | 2008 | 18316736 |
| influence of sediment components on the immobilization of zn during microbial fe-(hydr)oxide reduction. | the fate of zn and other sorbed heavy metals during microbial reduction of iron oxides is different when comparing synthetic fe-(hydr)oxides and natural sediments undergoing a similar degree of iron reduction. batch experiments with the iron-reducing organism shewanella putrefaciens were conducted to examine the effects of an aqueous complexant (nitrilotriacetic acid or nta), two solid-phase complexants (kaolinite and montmorillonite), an electron carrier (anthraquinone disulfonic acid or aqds), ... | 2006 | 16830547 |
| microbial selenate sorption and reduction in nutrient limited systems. | in this study, batch sorption experiments and x-ray adsorption spectroscopy (xas) were utilized to investigate selenate sorption onto shewanella putrefaciens 200r. selenate sorption was studied as a function of ph (ranging from 3 to 7), ionic strength (ranging from 0.1 to 0.001 m), and initial selenate concentration (ranging from 10 to 5000 microm) in the absence of external electron donors. the results show that the extent of selenate sorption is strongly dependent on ph and ionic strength, wit ... | 2006 | 16830542 |
| uranium(vi) reduction by anaeromyxobacter dehalogenans strain 2cp-c. | previous studies demonstrated growth of anaeromyxobacter dehalogenans strain 2cp-c with acetate or hydrogen as the electron donor and fe(iii), nitrate, nitrite, fumarate, oxygen, or ortho-substituted halophenols as electron acceptors. in this study, we explored and characterized u(vi) reduction by strain 2cp-c. cell suspensions of fumarate-grown 2cp-c cells reduced u(vi) to u(iv). more-detailed growth studies demonstrated that hydrogen was the required electron donor for u(vi) reduction and coul ... | 2006 | 16672509 |
| knock-out of so1377 gene, which encodes the member of a conserved hypothetical bacterial protein family cog2268, results in alteration of iron metabolism, increased spontaneous mutation and hydrogen peroxide sensitivity in shewanella oneidensis mr-1. | shewanella oneidensis mr-1 is a facultative, gram-negative bacterium capable of coupling the oxidation of organic carbon to a wide range of electron acceptors such as oxygen, nitrate and metals, and has potential for bioremediation of heavy metal contaminated sites. the complete 5-mb genome of s. oneidensis mr-1 was sequenced and standard sequence-comparison methods revealed approximately 42% of the mr-1 genome encodes proteins of unknown function. defining the functions of hypothetical proteins ... | 2006 | 16600046 |
| effect of packaging atmosphere on the microbial attributes of pearlspot (etroplus suratensis bloch) stored at 0-2 degrees c. | effect of packaging atmosphere (air and under different modified atmospheres (mas), 40% co2/60% o2, 50%/50% o2, 60% co2/40% o2, 70% co2/30% o2 and 40% co2/30% o2/30% n2) on the microbial and biochemical attributes of fresh pearlspot (etroplus suratensis bloch) stored at 0-2 degrees c was investigated. trimethylamine nitrogen (tma-n) and thiobarbituric acid (tba) values remained lower than the proposed acceptability limits throughout the storage period. results demonstrated that storage of pearls ... | 2008 | 18355677 |
| isolation of the exoelectrogenic bacterium ochrobactrum anthropi yz-1 by using a u-tube microbial fuel cell. | exoelectrogenic bacteria have potential for many different biotechnology applications due to their ability to transfer electrons outside the cell to insoluble electron acceptors, such as metal oxides or the anodes of microbial fuel cells (mfcs). very few exoelectrogens have been directly isolated from mfcs, and all of these organisms have been obtained by techniques that potentially restrict the diversity of exoelectrogenic bacteria. a special u-tube-shaped mfc was therefore developed to enrich ... | 2008 | 18359834 |
| characterization of the shewanella oneidensis fur gene: roles in iron and acid tolerance response. | iron homeostasis is a key metabolism for most organisms. in many bacterial species, coordinate regulation of iron homeostasis depends on the protein product of a fur gene. fur also plays roles in virulence, acid tolerance, redox-stress responses, flagella chemotaxis and metabolic pathways. | 2008 | 18366600 |
| shewanella and photobacterium spp. in oysters and seawater from the delaware bay. | shewanella algae, s. putrefaciens, and photobacterium damselae subsp. damselae are indigenous marine bacteria and human pathogens causing cellulitis, necrotizing fasciitis, abscesses, septicemia, and death. infections are rare and are most often associated with the immunocompromised host. a study was performed on the microbiological flora of oysters and seawater from commercial oyster harvesting sites in the delaware bay, new jersey. from 276 water and shellfish samples tested, 1,421 bacterial i ... | 2008 | 18378645 |
| reduction of soluble and insoluble iron forms by membrane fractions of shewanella oneidensis grown under aerobic and anaerobic conditions. | the effect of iron substrates and growth conditions on in vitro dissimilatory iron reduction by membrane fractions of shewanella oneidensis mr-1 was characterized. membrane fractions were separated by sucrose density gradients from cultures grown with o(2), fumarate, and aqueous ferric citrate as the terminal electron acceptor. marker enzyme assays and two-dimensional gel electrophoresis demonstrated the high degree of separation between the outer and cytosolic membrane. protein expression patte ... | 2006 | 16597999 |
| phosphate imposed limitations on biological reduction and alteration of ferrihydrite. | biogeochemical transformation (inclusive of dissolution) of iron (hydr)oxides resulting from dissimilatory reduction has a pronounced impact on the fate and transport of nutrients and contaminants in subsurface environments. despite the reactivity noted for pristine (unreacted) minerals, iron (hydr)oxides within native environments will likely have a different reactivity owing in part to changes in surface composition. accordingly, here we explore the impact of surface modifications induced by p ... | 2007 | 17265943 |
| profiling the membrane proteome of shewanella oneidensis mr-1 with new affinity labeling probes. | the membrane proteome plays a critical role in electron transport processes in shewanella oneidensis mr-1, a bacterial organism that has great potential for bioremediation. biotinylation of intact cells with subsequent affinity-enrichment has become a useful tool for characterization of the membrane proteome. as opposed to these commonly used, water-soluble commercial reagents, we here introduce a family of hydrophobic, cell-permeable affinity probes for extensive labeling and detection of membr ... | 2007 | 17269728 |
| kinetic analysis of microbial reduction of fe(iii) in nontronite. | microbial reduction of structural fe(iii) in nontronite (nau-2) was studied in batch cultures under non-growth condition using shewanella putrefaciens strain cn32. the rate and extent of structural fe(iii) reduction was examined as a function of electron acceptor [fe(iii)] and bacterial concentration. fe(ll) sorption onto nau-2 and cn32 surfaces was independently measured and described by the langmuir expression with the affinity constant (log k) of 3.21 and 3.30 for nau-2 and bacteria, respecti ... | 2007 | 17438797 |
| decolorization of azo dyes by shewanella sp. under saline conditions. | wastewaters from textile processing and dye-stuff manufacture industries contain substantial amounts of salts in addition to azo dye residues. to examine salinity effects on dye-degrading bacteria, a study was carried out with four azo dyes in the presence of varying concentrations of nacl (0-100 g l(-1)) with a previously isolated bacterium, shewanella putrefaciens strain as96. under static, low oxygen conditions, the bacterium decolorized 100 mg dye l(-1) at salt concentrations up to 60 g nacl ... | 2008 | 18461315 |
| antimicrobial and antioxidative activities of bioactive constituents from hydnophytum formicarum jack. | hydnophytum formicarum jack. (rubiaceae) is a medicinal plant whose tubers possesses cardiovascular, anti-inflammatory and antiparasitic effects and have been used for the treatment of hepatitis, rheumatism and diarrhea. herein we report the isolation of its active constituents and the testing of their antimicrobial activity against 27 strains of microorganisms using an agar dilution method and of their antioxidative activity using the dpph and sod assays. the results show that the crude hexane, ... | 2008 | 18463592 |
| molecular structure of endotoxins from gram-negative marine bacteria: an update. | marine bacteria are microrganisms that have adapted, through millions of years, to survival in environments often characterized by one or more extreme physical or chemical parameters, namely pressure, temperature and salinity. the main interest in the research on marine bacteria is due to their ability to produce several biologically active molecules, such as antibiotics, toxins and antitoxins, antitumor and antimicrobial agents. nonetheless, lipopolysaccharides (lpss), or their portions, from g ... | 2007 | 18463721 |
| first report of isolation and characterization of aurantimonas altamirensis from clinical samples. | the genus aurantimonas, proposed in 2003, encompasses four species from environmental sources, including aurantimonas altamirensis, isolated from a cave wall in spain. here, we report what we believe are the first cases of the recovery of a. altamirensis from human clinical materials. | 2008 | 18495852 |
| antimicrobial and antioxidant effects of sodium acetate, sodium lactate, and sodium citrate in refrigerated sliced salmon. | this study was carried out to evaluate the microbiological quality and lipid oxidation of fresh salmon slices treated by dipping in 2.5% (w/v) aqueous solution of sodium acetate (naa), sodium lactate (nal), or sodium citrate (nac) and stored at 1 degrees c. the results revealed that these salts were efficient (p < 0.05) against the proliferation of various categories of spoilage microorganisms; including aerobic and psychrotrophic populations, pseudomonas spp., h(2)s-producing bacteria, lactic a ... | 2007 | 17471315 |
| insights and inferences about integron evolution from genomic data. | integrons are mechanisms that facilitate horizontal gene transfer, allowing bacteria to integrate and express foreign dna. these are important in the exchange of antibiotic resistance determinants, but can also transfer a diverse suite of genes unrelated to pathogenicity. here, we provide a systematic analysis of the distribution and diversity of integron inti genes and integron-containing bacteria. | 2008 | 18513439 |
| extracellular respiration. | although it has long been known that microbes can generate energy using diverse strategies, only recently has it become clear that a growing number involve electron transfer to or from extracellular substrates. the best-known example of what we will term 'extracellular respiration' is electron transfer between microbes and minerals, such as iron and manganese (hydr)oxides. this makes sense, given that these minerals are sparingly soluble. what is perhaps surprising, however, is that a number of ... | 2007 | 17581115 |
| the effect of an acidic, copper sulfate-based commercial sanitizer on indicator, pathogenic, and spoilage bacteria associated with broiler chicken carcasses when applied at various intervention points during poultry processing. | studies were conducted to evaluate 1) the effect of an acidic, copper sulfate-based commercial sanitizer on pathogenic, indicator, and spoilage bacteria in a model scalder system, 2) the effect of this sanitizer on total aerobic bacteria (apc) and escherichia coli counts, and salmonella prevalence on broiler chicken carcasses when applied during scalding or scalding and postpick dipping, and 3) the ability of sanitizer to extend the shelf-life of broiler chicken carcasses. exposure of salmonella ... | 2008 | 18577627 |
| respiration of metal (hydr)oxides by shewanella and geobacter: a key role for multihaem c-type cytochromes. | dissimilatory reduction of metal (e.g. fe, mn) (hydr)oxides represents a challenge for microorganisms, as their cell envelopes are impermeable to metal (hydr)oxides that are poorly soluble in water. to overcome this physical barrier, the gram-negative bacteria shewanella oneidensis mr-1 and geobacter sulfurreducens have developed electron transfer (et) strategies that require multihaem c-type cytochromes (c-cyts). in s. oneidensis mr-1, multihaem c-cyts cyma and mtra are believed to transfer ele ... | 2007 | 17581116 |
| hydrologic flow controls on biologic iron(iii) reduction in natural sediments. | bacterial reduction of a hematite-rich natural coastal sand was studied in flow-through column reactors at flow rates which varied from 0.62 to 11 pore volumes d(-1). sand columns were wet-packed with the dissimilatory metal-reducing bacterium (dmrb) shewanella putrefaciens cn32, and a pipes-buffered, lactate-containing growth medium was pumped through the columns for over 20 days. soluble fe(ii), acetate and lactate concentrations measured in the column effluents showed that steady-state condit ... | 2007 | 17593722 |
| outbreak of shewanella algae and shewanella putrefaciens infections caused by a shared measuring cup in a general surgery unit in korea. | to control an outbreak of shewanella algae and s. putrefaciens infections by identifying the risk factors for infection and transmission. | 2008 | 18631115 |
| confounding impacts of iron reduction on arsenic retention. | a transition from oxidizing to reducing conditions has long been implicated to increase aqueous as concentrations, for which reductive dissolution of iron (hydr)oxides is commonly implicated as the primary culprit. confounding our understanding of processes controlling as retention, however, is that reductive transformation of ferrihydrite has recently been shown to promote as retention rather than release. to resolve the role iron phases have in regulating arsenic concentrations, here we examin ... | 2008 | 18678005 |
| generation and validation of a shewanella oneidensis mr-1 clone set for protein expression and phage display. | a comprehensive gene collection for s. oneidensis was constructed using the lambda recombinase (gateway) cloning system. a total of 3584 individual orfs (85%) have been successfully cloned into the entry plasmids. to validate the use of the clone set, three sets of orfs were examined within three different destination vectors constructed in this study. success rates for heterologous protein expression of s. oneidensis his- or his/gst-tagged proteins in e. coli were approximately 70%. the arca an ... | 2008 | 18714347 |
| effect of natural organic matter on zinc inhibition of hematite bioreduction by shewanella putrefaciens cn32. | the effect of zinc on the biological reduction of hematite (alpha-fe2o3) by the dissimilatory metal-reducing bacterium (dmrb) shewanella putrefaciens cn32 was studied in the presence of four natural organic materials (noms). experiments were performed under non-growth conditions with h2 as the electron donor and zinc inhibition was quantified as the decrease in the 5 d extent of hematite bioreduction as compared to no-zinc controls. every nom was shown to significantly increase zinc inhibition d ... | 2007 | 17822092 |
| speciation of vanadium in oilsand coke and bacterial culture by high performance liquid chromatography inductively coupled plasma mass spectrometry. | a simple and sensitive method for the speciation of vanadium(iii), (iv), and (v) was developed by using high performance liquid chromatography and inductively coupled plasma mass spectrometry (hplc-icpms). the edta-complexed vanadium species were separated on a strong anion exchange column with an eluent containing 2 mm edta, 3% acetonitrile, and 80 mm ammonium bicarbonate at ph 6. each analysis was complete in 5 min. the detection limits were 0.6, 0.7 and 1.0 microg l(-1) for v(iii), v(iv), and ... | 2007 | 17936102 |
| contrasting effects of dissimilatory iron (iii) and arsenic (v) reduction on arsenic retention and transport. | reduction of arsenate as(v) and as-bearing fe (hydr)- oxides have been proposed as dominant pathways of as release within soils and aquifers. here we examine as elution from columns loaded with ferrihydrite-coated sand presorbed with as(v) or as(iii) at circumneutral ph upon fe and/or as reduction; biotic stimulated reduction is then compared to abiotic elution. columns were inoculated with shewanella putrefaciens strain cn-32 or sulfurospirillum barnesii strain ses-3, organisms capable of as (v ... | 2006 | 17144301 |
| spatially resolved force spectroscopy of bacterial surfaces using force-volume imaging. | force spectroscopy using the atomic force microscope (afm) is a powerful technique for measuring physical properties and interaction forces at microbial cell surfaces. typically for such a study, the point at which a force measurement will be made is located by first imaging the cell using afm in contact mode. in this study, we image the bacterial cell shewanella putrefaciens for subsequent force measurements using afm in force-volume mode and compare this to contact-mode images. it is known tha ... | 2008 | 18023156 |
| study on the synergic effect of natural compounds on the microbial quality decay of packed fish hamburger. | the effectiveness of natural compounds in slowing down the microbial quality decay of refrigerated fish hamburger is addressed in this study. in particular, the control of the microbiological spoilage by combined use of three antimicrobials, and the determination of their optimal composition to extend the fish hamburger microbiological stability limit (mal) are the main objectives of this work. thymol, grapefruit seed extract (gfse) and lemon extract were tested for monitoring the cell growth of ... | 2008 | 18804302 |
| analysis of the pseudoalteromonas tunicata genome reveals properties of a surface-associated life style in the marine environment. | colonisation of sessile eukaryotic host surfaces (e.g. invertebrates and seaweeds) by bacteria is common in the marine environment and is expected to create significant inter-species competition and other interactions. the bacterium pseudoalteromonas tunicata is a successful competitor on marine surfaces owing primarily to its ability to produce a number of inhibitory molecules. as such p. tunicata has become a model organism for the studies into processes of surface colonisation and eukaryotic ... | 2008 | 18813346 |
| acclimated biomass that degrades sulfonated naphthalene formaldehyde condensate. | a number of aerobic species were isolated from textile industry activated sludge wastewater. the bacterial consortium was acclimated during seven days before testing its capacity of sulfonated naphthalene-formaldehyde condensate (snfc) recalcitrant compound degradation. snfc's degradation was evaluated by using different techniques including: vapour pressure osmometry, spectroscopy uv-visible and chemical oxygen demand (cod). the degradation of snfc by acclimated bacterial consortium was determi ... | 2008 | 18819646 |
| speciation-dependent microbial reduction of uranium within iron-coated sands. | transport of uranium within surface and subsurface environments is predicated largely on its redox state. uranyl reduction may transpire through either biotic (enzymatic) or abiotic pathways; in either case, reduction of u(vi) to u(iv) results in the formation of sparingly soluble uo2 precipitates. biological reduction of u(vi), while demonstrated as prolific under both laboratory and field conditions, is influenced by competing electron acceptors (such as nitrate, manganese oxides, or iron oxid ... | 2007 | 18044509 |
| accelerated decolorization of structurally different azo dyes by newly isolated bacterial strains. | wastewater effluents from the textile and other dye-stuff industries contain significant amounts of synthetic dyes that require treatment to prevent groundwater contamination. in research aimed at biotechnology for treatment of azo dyes, this study examined 288 strains of azo-dye degrading bacteria to identify efficient strains and determine incubation times required for decolorization. initial enrichment cultures were carried out using a mixture of four structurally different dyes (acid red 88, ... | 2008 | 18084755 |
| microbial and endotoxin contamination of water-soluble metalworking fluids. | the present study is a part of a larger project on assessment of exposure to biological agents and respiratory health effects among metal workers. | 2007 | 18165196 |
| potential for luxs related signalling in marine bacteria and production of autoinducer-2 in the genus shewanella. | the autoinducer-2 (ai-2) group of signalling molecules are produced by both gram positive and gram negative bacteria as the by-product of a metabolic transformation carried out by the luxs enzyme. they are the only non species-specific quorum sensing compounds presently known in bacteria. the luxs gene coding for the ai-2 synthase enzyme was found in many important pathogens. here, we surveyed its occurrence in a collection of 165 marine isolates belonging to abundant marine phyla using conserve ... | 2008 | 18215278 |
| probing regulon of arca in shewanella oneidensis mr-1 by integrated genomic analyses. | the arc two-component system is a global regulator controlling many genes involved in aerobic/anaerobic respiration and fermentative metabolism in escherichia coli. shewanella oneidensis mr-1 contains a gene encoding a putative arca homolog with ~81% amino acid sequence identity to the e. coli arca protein but not a full-length arcb gene. | 2008 | 18221523 |
| biodegradation of pyridine by the new bacterial isolates s. putrefaciens and b. sphaericus. | in this study, two bacterial strains capable of utilizing pyridine as a sole carbon source were isolated from biofilters. based on the biochemical test, the organisms were identified as shewanella putrefaciens and bacillus sphaericus. in liquid cultures, s. putrefaciens and b. sphaericus degraded pyridine quite effectively up to 500 mg l(-1). s. putrefaciens degrades 500 mg l(-1) of pyridine completely within 140 h, whereas the b. sphaericus degrades 500 mg l(-1) of pyridine only nearly 75% and ... | 2008 | 18295401 |
| in vivo identification of the outer membrane protein omca-mtrc interaction network in shewanella oneidensis mr-1 cells using novel hydrophobic chemical cross-linkers. | outer membrane (om) cytochromes omca (so1779) and mtrc (so1778) are the integral components of electron transfer used by shewanella oneidensis for anaerobic respiration of metal (hydr)oxides. here the omca-mtrc interaction was identified in vivo using a novel hydrophobic chemical cross-linker (mrn) combined with immunoprecipitation techniques. in addition, identification of other om proteins from the cross-linked complexes allows first visualization of the omca-mtrc interaction network. further ... | 2008 | 18303833 |
| production, characterization and determination of the real catalytic properties of the putative 'succinate dehydrogenase' from wolinella succinogenes. | both the genomes of the epsilonproteobacteria wolinella succinogenes and campylobacter jejuni contain operons (sdhabe) that encode for so far uncharacterized enzyme complexes annotated as 'non-classical' succinate:quinone reductases (sqrs). however, the role of such an enzyme ostensibly involved in aerobic respiration in an anaerobic organism such as w. succinogenes has hitherto been unknown. we have established the first genetic system for the manipulation and production of a member of the non- ... | 2009 | 19170876 |
| genomic and functional analysis of icepdaspa1, a fish-pathogen-derived sxt-related integrating conjugative element that can mobilize a virulence plasmid. | integrating conjugative elements (ices) are self-transmissible mobile elements that transfer between bacteria via conjugation and integrate into the host chromosome. sxt and related ices became prevalent in asian vibrio cholerae populations in the 1990s and play an important role in the dissemination of antibiotic resistance genes in v. cholerae. here, we carried out genomic and functional analyses of icepdaspa1, an sxt-related ice derived from a spanish isolate of photobacterium damselae subsp. ... | 2008 | 18326579 |
| [taxonomic characteristics and physiological properties of microorganisms from the gut of pike (esox lucius)]. | the taxonomic composition and distribution of microorganisms differing in the degree of association with the intestinal mucosa of the pike (lucius lucius) has been studied. microorgansism of the families enterobacteriaceae, aeromonadaceae, and vibrionaceae dominate in the gut microflora. numerically prevailing bacterial species are characterized by high proteolytic and amylolytic enzyme activities as well as by high persistence accounted for by antilysozyme and antihistone activities. the result ... | 2008 | 19198074 |
| development of a microbial time/temperature indicator prototype for monitoring the microbiological quality of chilled foods. | a time/temperature indicator (tti) system based on the growth and metabolic activity of a lactobacillus sakei strain was developed for monitoring food quality throughout the chilled-food chain. in the designed system, an irreversible color change of a chemical chromatic indicator (from red to yellow) progressively occurs due to the ph decline that results from microbial growth and metabolism in a selected medium. the relation of the tti response (color change) to the growth and metabolic activit ... | 2008 | 18326676 |
| hexavalent chromium causes the oxidation of thioredoxin in human bronchial epithelial cells. | hexavalent chromium [cr(vi)] species such as chromates are cytotoxic. inhalational exposure is a primary concern in many cr-related industries and their immediate environments, and bronchial epithelial cells are directly exposed to inhaled cr(vi). chromates are readily taken up by cells and are reduced to reactive cr species which may also result in the generation of reactive oxygen species (ros). the thioredoxin (trx) system has a key role in the maintenance of cellular thiol redox balance and ... | 2008 | 18328613 |
| bacterial cell curvature through mechanical control of cell growth. | the cytoskeleton is a key regulator of cell morphogenesis. crescentin, a bacterial intermediate filament-like protein, is required for the curved shape of caulobacter crescentus and localizes to the inner cell curvature. here, we show that crescentin forms a single filamentous structure that collapses into a helix when detached from the cell membrane, suggesting that it is normally maintained in a stretched configuration. crescentin causes an elongation rate gradient around the circumference of ... | 2009 | 19279668 |
| [non necrotizing bacterial cellulitis and bacteriemia due to shewanella putrefaciens]. | shewanella putrefaciens is a gram negative opportunistic pathogen which causes skin and soft tissue infections and bacteriemia in immunocompromized patients. we report a 86-year-old man, who presented with an infectious cellulitis of the leg associated with shewanella putrefaciens bacteriemia. this patient was treated by mycophenolate mofetil for a bullous pemphigoid resistant to corticotherapy. | 2009 | 19282070 |
| vibrio cholerae in the environment: a simple method for reliable identification of the species. | a simple screening and identification protocol was assessed for the efficient distinction of colonies of vibrio cholerae species from others obtained on thiosulphate citrate bile salts sucrose agar after isolation from different environmental specimens. it was demonstrated here that the yellow colonies (sucrose-fermenting), which are able to grow on nutrient agar without added nacl and which present a positive oxidase reaction, can be confidently considered as presumptive v. cholerae. confirmati ... | 2007 | 18330064 |
| identification of mobile elements and pseudogenes in the shewanella oneidensis mr-1 genome. | shewanella oneidensis mr-1 is the first of 22 different shewanella spp. whose genomes have been or are being sequenced and thus serves as the model organism for studying the functional repertoire of the shewanella genus. the original mr-1 genome annotation revealed a large number of transposase genes and pseudogenes, indicating that many of the genome's functions may be decaying. comparative analyses of the sequenced shewanella strains suggest that 209 genes in mr-1 have in-frame stop codons, fr ... | 2008 | 18378659 |
| performance of a yeast-mediated biological fuel cell. | saccharomyces cerevisiae present in common baker's yeast was used in a microbial fuel cell in which glucose was the carbon source. methylene blue was used as the electronophore in the anode compartment, while potassium ferricyanide and methylene blue were tested as electron acceptors in the cathode compartment. microbes in a mediator-free environment were used as the control. the experiment was performed in both open and closed circuit configurations under different loads ranging from 100 komega ... | 2008 | 19325724 |
| skin and soft tissue infections (patera foot) in immigrants, spain. | an unusual skin and soft tissue infection of the lower limbs has been observed in immigrants from sub-saharan africa who cross the atlantic ocean crowded on small fishing boats (pateras). response to conventional treatment is usually poor. extreme extrinsic factors (including new pathogens) may contribute to the etiology of the infection and its pathogenesis. | 2009 | 19331742 |
| environmental adaptation: genomic analysis of the piezotolerant and psychrotolerant deep-sea iron reducing bacterium shewanella piezotolerans wp3. | shewanella species are widespread in various environments. here, the genome sequence of shewanella piezotolerans wp3, a piezotolerant and psychrotolerant iron reducing bacterium from deep-sea sediment was determined with related functional analysis to study its environmental adaptation mechanisms. the genome of wp3 consists of 5,396,476 base pairs (bp) with 4,944 open reading frames (orfs). it possesses numerous genes or gene clusters which help it to cope with extreme living conditions such as ... | 2008 | 18398463 |
| copper uptake by pseudomonas aeruginosa isolated from infected burn patients. | pseudomonas aeruginosa was isolated from infected burn patients and characterized by standard biochemical tests. the in vitro copper uptake was compared between this isolated pathogenic strain and two non-pathogenic control strains of gram positive bacteria bacillus thuringiensis strain israelis as well as gram negative bacteria enterobacter aerogenes. maximum copper uptake of 470 ppm/g biomass was obtained by p. aeruginosa strain, while the control strains b. thuringiensis and enterobacter aero ... | 2009 | 19484296 |
| comparative proteogenomics: combining mass spectrometry and comparative genomics to analyze multiple genomes. | recent proliferation of low-cost dna sequencing techniques will soon lead to an explosive growth in the number of sequenced genomes and will turn manual annotations into a luxury. mass spectrometry recently emerged as a valuable technique for proteogenomic annotations that improves on the state-of-the-art in predicting genes and other features. however, previous proteogenomic approaches were limited to a single genome and did not take advantage of analyzing mass spectrometry data from multiple g ... | 2008 | 18426904 |
| combined effect of an oxygen absorber and oregano essential oil on shelf life extension of rainbow trout fillets stored at 4 degrees c. | in the present study the combined effect of an o2 absorber and oregano essential oil (0.4% v/w) on shelf life extension of rainbow trout fillets (onchorynchus mykiss) stored under refrigeration (4 degrees c) was investigated. the study was based on microbiological [tvc, pseudomonas spp., lactic acid bacteria, h2s-producing bacteria including shewanella putrefaciens, enterobacteriaceae and clostridium spp.), physicochemical (ph, pv, tba, tvbn and drip loss) and sensory (odor, taste) changes occur ... | 2009 | 19527835 |
| behavioral response of dissimilatory perchlorate-reducing bacteria to different electron acceptors. | the response behavior of three dissimilatory perchlorate-reducing bacteria to different electron acceptors (nitrate, chlorate, and perchlorate) was investigated with two different assays. the observed response was species-specific, dependent on the prior growth conditions, and was inhibited by oxygen. we observed attraction toward nitrate when dechloromonas aromatica strain rcb and azospira suillum strain ps were grown with nitrate. when d. aromatica and dechloromonas agitata strain ckb were gro ... | 2009 | 19533120 |
| anaerobic respiration of elemental sulfur and thiosulfate by shewanella oneidensis mr-1 requires psra, a homolog of the phsa gene of salmonella enterica serovar typhimurium lt2. | shewanella oneidensis mr-1, a facultatively anaerobic gammaproteobacterium, respires a variety of anaerobic terminal electron acceptors, including the inorganic sulfur compounds sulfite (so3(2-)), thiosulfate (s2o3(2-)), tetrathionate (s4o6(2-)), and elemental sulfur (s(0)). the molecular mechanism of anaerobic respiration of inorganic sulfur compounds by s. oneidensis, however, is poorly understood. in the present study, we identified a three-gene cluster in the s. oneidensis genome whose trans ... | 2009 | 19542325 |
| biosorption of metals (cu(2+), zn(2+)) and anions (f(-), h(2)po(4)(-)) by viable and autoclaved cells of the gram-negative bacterium shewanella putrefaciens. | microbial biomass represents a potentially cost-effective sorbent for water treatment applications. high sorption capacities for both cations and anions are demonstrated here for viable and autoclaved cell suspensions of the gram-negative bacterium shewanella putrefaciens. ftir absorption spectra and ph-dependent zeta-potentials are similar for the viable and killed bacterial cells. potentiometric titrations, however, reveal a two to three times higher oh(-) buffering capacity for the living cel ... | 2008 | 18450432 |
| membrane tetraheme cytochrome c(m552) of the ammonia-oxidizing nitrosomonas europaea: a ubiquinone reductase. | cytochrome c(m552) (cyt c(m552)) from the ammonia-oxidizing nitrosomonas europaea is encoded by the cycb gene, which is preceded in a gene cluster by three genes encoding proteins involved in the oxidation of hydroxylamine: hao, hydroxylamine oxidoreductase; orf2, a putative membrane protein; cyca, cyt c(554). by amino acid sequence alignment of the core tetraheme domain, cyt c(m552) belongs to the napc/torc family of tetra- or pentaheme cytochrome c species involved in electron transport from m ... | 2008 | 18505274 |
| microfabricated microbial fuel cell arrays reveal electrochemically active microbes. | microbial fuel cells (mfcs) are remarkable "green energy" devices that exploit microbes to generate electricity from organic compounds. mfc devices currently being used and studied do not generate sufficient power to support widespread and cost-effective applications. hence, research has focused on strategies to enhance the power output of the mfc devices, including exploring more electrochemically active microbes to expand the few already known electricigen families. however, most of the mfc de ... | 2009 | 19668333 |
| actinomycete integrative and conjugative elements. | this paper reviews current knowledge on actinomycete integrative and conjugative elements (aices). the best characterised aices, psam2 of streptomyces ambofaciens (10.9 kb), slp1 (17.3 kb) of streptomyces coelicolor and pmea300 of amycolatopsis methanolica (13.3 kb), are present as integrative elements in specific trna genes, and are capable of conjugative transfer. these aices have a highly conserved structural organisation, with functional modules for excision/integration, replication, conjuga ... | 2008 | 18523858 |
| purulent pericarditis with greenish pericardial effusion caused by shewanella algae. | we report the first case of purulent pericarditis with greenish pericardial effusion caused by shewanella algae in a patient with gastric and gallbladder cancer. this case expands the reported spectrum of infection caused by s. algae and raises the possibility that s. algae is a causative pathogen for purulent pericarditis. | 2008 | 18579719 |
| identification of a gene cluster that directs putrebactin biosynthesis in shewanella species: pubc catalyzes cyclodimerization of n-hydroxy-n-succinylputrescine. | putrebactin is a dihydroxamate iron chelator produced by the metabolically versatile marine bacterium shewanella putrefaciens. it is a macrocyclic dimer of n-hydroxy-n-succinyl-putrescine (hsp) and is structurally related to desferrioxamine e, which is a macrocyclic trimer of n-hydroxy-n-succinyl-cadaverine (hsc). we recently showed that desd, a member of the nis synthetase superfamily, catalyzes the key step in desferrioxamine e biosynthesis: atp-dependent trimerisation and macrocylization of h ... | 2008 | 18630910 |
| transcriptome analysis reveals response regulator so2426-mediated gene expression in shewanella oneidensis mr-1 under chromate challenge. | shewanella oneidensis mr-1 exhibits diverse metal ion-reducing capabilities and thus is of potential utility as a bioremediation agent. knowledge of the molecular components and regulatory mechanisms dictating cellular responses to heavy metal stress, however, remains incomplete. in a previous work, the s. oneidensis so2426 gene, annotated as a dna-binding response regulator, was demonstrated to be specifically responsive at both the transcript and protein levels to acute chromate [cr(vi)] chall ... | 2008 | 18718017 |
| biogenic formation of as-s nanotubes by diverse shewanella strains. | shewanella sp. strain hn-41 was previously shown to produce novel, photoactive, as-s nanotubes via the reduction of as(v) and s(2)o(3)(2-) under anaerobic conditions. to determine if this ability was unique to this bacterium, 10 different shewanella strains, including shewanella sp. strain hn-41, shewanella sp. strain pv-4, shewanella alga bry, shewanella amazonensis sb2b, shewanella denitrificans os217, shewanella oneidensis mr-1, shewanella putrefaciens cn-32, s. putrefaciens ir-1, s. putrefac ... | 2009 | 19717628 |
| shewanella oneidensis mr-1 h-nox regulation of a histidine kinase by nitric oxide. | nitric oxide (no) signaling in animals controls processes such as smooth muscle relaxation and neurotransmission by activation of soluble guanylate cyclase (sgc). prokaryotic homologues of the sgc heme domain, called h-nox domains, have been identified and are generally found in a predicted operon in conjunction with a histidine kinase. here, we show that an h-nox protein (so2144) from shewanella oneidensis directly interacts with the sensor histidine kinase (so2145), binds no in a 5-coordinate ... | 2007 | 17988156 |
| assessment of data processing to improve reliability of microarray experiments using genomic dna reference. | using genomic dna as common reference in microarray experiments has recently been tested by different laboratories. conflicting results have been reported with regard to the reliability of microarray results using this method. to explain it, we hypothesize that data processing is a critical element that impacts the data quality. | 2008 | 18831796 |
| diversity, epidemiology, and genetics of class d beta-lactamases. | class d beta-lactamase-mediated resistance to beta-lactams has been increasingly reported during the last decade. those enzymes also known as oxacillinases or oxas are widely distributed among gram negatives. genes encoding class d beta-lactamases are known to be intrinsic in many gram-negative rods, including acinetobacter baumannii and pseudomonas aeruginosa, but play a minor role in natural resistance phenotypes. the oxas (ca. 150 variants reported so far) are characterized by an important ge ... | 2010 | 19721065 |
| diversity, epidemiology, and genetics of class d beta-lactamases. | class d beta-lactamase-mediated resistance to beta-lactams has been increasingly reported during the last decade. those enzymes also known as oxacillinases or oxas are widely distributed among gram negatives. genes encoding class d beta-lactamases are known to be intrinsic in many gram-negative rods, including acinetobacter baumannii and pseudomonas aeruginosa, but play a minor role in natural resistance phenotypes. the oxas (ca. 150 variants reported so far) are characterized by an important ge ... | 2010 | 19721065 |
| effects of electron transfer mediators on the bioreduction of lepidocrocite (gamma-feooh) by shewanella putrefaciens cn32. | electron transfer mediators (etms) such as low-molecular-mass quinones (e.g., juglone and lawsone) and humic substances are believed to play a role in many redox reactions involved in contaminant transformations and the biogeochemical cycling of many redox-active elements (e.g., fe and mn) in aquatic and terrestrial environments. this study examines the effects of a series of compounds representing major classes of natural and synthetic organic etms, including low-molecular-mass quinones, humic ... | 2008 | 18853803 |
| novel electrochemically active bacterium phylogenetically related to arcobacter butzleri, isolated from a microbial fuel cell. | exoelectrogenic bacteria are organisms that can transfer electrons to extracellular insoluble electron acceptors and have the potential to be used in devices such as microbial fuel cells (mfcs). currently, exoelectrogens have been identified in the alpha-, beta-, gamma- and deltaproteobacteria, as well as in the firmicutes and acidobacteria. here, we describe use of culture-independent methods to identify two members of the genus arcobacter in the epsilonproteobacteria that are selectively enric ... | 2009 | 19801475 |