Publications

occurrence of manganese-oxidizing microorganisms and manganese deposition during biofilm formation on stainless steel in a brackish surface water.	abstract biofilm formation on 316l stainless steel was investigated in a pilotscale flow-through system fed with brackish surface water using an alternating flow/stagnation/flow regime. microbial community analysis by denaturing gradient gel electrophoresis and sequencing revealed the presence of complex microbial ecosystems consisting of, amongst others, leptothrix-related manganese-oxidizing bacteria in the adjacent water, and sulfur-oxidizing, sulfate-reducing and slime-producing bacteria in ...	2002	19709183
ultrastructure and potential sub-seafloor evidence of bacteriogenic iron oxides from axial volcano, juan de fuca ridge, north-east pacific ocean.	iron oxides from the caldera of axial volcano, a site of hydrothermal vent activity along the juan de fuca ridge, were found to consist predominantly of microbial structures in hydrated whole mounts examined using an environmental scanning electron microscope. novel observations were made of the iron oxides revealing the spatial relationships of the bacteria within to be more consistent with microbial mats than mineral precipitates. the bacterial structures are attributed to the sheaths of lepto ...	2003	19719685
bacterioplankton community structure in a maritime antarctic oligotrophic lake during a period of holomixis, as determined by denaturing gradient gel electrophoresis (dgge) and fluorescence in situ hybridization (fish).	the bacterioplankton community structure in moss lake, a maritime antarctic oligotrophic lake, was determined with vertical depth in the water column, during the ice-free period on signy island in the south orkney islands. bacterioplankton community structure was determined using a combination of direct counting of 4',6-diamidino-2-phenylindole (dapi) stained cells, pcr amplification of 16s rrna gene fragments, denaturing gradient gel electrophoresis (dgge) and in situ hybridization with group-s ...	2003	12739078
caenibacterium thermophilum gen. nov., sp. nov., isolated from a thermophilic aerobic digester of municipal sludge.	a bacterial strain, n2-680(t) (=dsm 15264(t)=lmg 21760(t)), isolated from a thermophilic aerobic digester of municipal sludge, was characterized with respect to its morphology, physiology and taxonomy. phenotypically, the isolate was a gram-negative rod with a polar flagellum, catalase- and oxidase-positive, containing cytoplasmic inclusions of poly-beta-hydroxybutyrate and had an optimal growth temperature of about 47 degrees c. strain n2-680(t) was unable to reduce nitrate and could use organi ...	2003	13130021
temporal change in culturable phenanthrene degraders in response to long-term exposure to phenanthrene in a soil column system.	widespread environmental contamination by polycyclic aromatic hydrocarbons (pah) has led to increased interest in the use of natural attenuation as a clean-up strategy. however, few bioremediation studies have investigated the behaviour of the indigenous pah-degrading community after long-term exposure to a pah. in this study, a column packed with sandy loam soil was exposed to a solution saturated with phenanthrene ( approximately 1.2 mg l-1) for a 6-month period to examine the temporal respons ...	2003	14510842
nanocrystalline todorokite-like manganese oxide produced by bacterial catalysis.	we describe the characterization of an unknown and difficult to identify but geochemically and environmentally significant mnox structure produced by a freshwater bacterium, leptothrix discophora sp-6, using combined transmission electron microscopy (tem), extended x-ray absorption fine structure (exafs), and uv raman spectroscopy. the large surface-to-volume ratio of the needle-shaped nanocrystalline mno2 formed around the bacterial cells coupled to the porous, zeolite-like structure has the po ...	2003	14624570
description of heterotrophic bacteria occurring in paper mills and paper products.	to isolate aerobic mesophilic bacilli and thermophilic bacteria from different paper mill samples and to evaluate their potential harmfulness.	2004	15546414
microbial polysaccharides template assembly of nanocrystal fibers.	biological systems can produce extraordinary inorganic structures and morphologies. the mechanisms of synthesis are poorly understood but are of great interest for engineering novel materials. we use spectromicroscopy to show that microbially generated submicrometer-diameter iron oxyhydroxide (feooh) filaments contain polysaccharides, providing an explanation for the formation of akaganeite pseudo-single crystals with aspect ratios of approximately 1000:1. we infer that the cells extrude the pol ...	2004	15016997
biocenosis of bac(f)s used for groundwater treatment.	the studies on the biocenosis of biologically active carbon filters (bac(f)) used in treatment of miocene water revealed the presence of protozoa of the group of flagellates and ciliates (glaucoma sp., opercularia sp.), saprophytic bacteria, phase i and ii nitrifying bacteria, fe(ii) and mn(ii) oxidizing bacteria of the family siderocapsaceae, leptothrix ochracea and pedomicrobium sp., as well as microscopic fungi. the stratification of biofilter colonisation by these microorganisms was found to ...	2004	15026224
inhibiting mild steel corrosion from sulfate-reducing and iron-oxidizing bacteria using gramicidin-s-producing biofilms.	a gramicidin-s-producing bacillus brevis 18-3 biofilm was shown to reduce corrosion rates of mild steel by inhibiting both the sulfate-reducing bacterium desulfosporosinus orientis and the iron-oxidizing bacterium leptothrix discophora sp-6. when l. discophora sp-6 was introduced along with d. orientis to a non-antimicrobial-producing biofilm control, paenibacillus polymyxa atcc 10401, a corrosive synergy was created and mild steel coupons underwent more severe corrosion than when only d. orient ...	2004	15278311
role of leptothrix discophora in mediating metal uptake in the filter-feeding bivalve mytilus trossulus (edulis).	the potential for filter-feeding bivalves to accumulate metals from a wide range of food sources is an important consideration when examining trophic transfer of metals up the food chain. the objective of this study was to determine the role of leptothrix discophora in mediating metal uptake in the filter-feeding bivalve mytilus trossulus. the bacterium l. discophora sp-6 was cultured in the absence or presence of mn, allowing for a naturally formed mn oxide sheath to develop. secondary metals ( ...	2004	14968863
laboratory modelling of manganese biofiltration using biofilms of leptothrix discophora.	laboratory biofilters (pilot-scale, 20 l and laboratory-scale, 5l) were constructed in order to model the bioaccumulation of manganese (mn) under flow conditions similar to those occurring in biofilters at groundwater treatment sites. the biofilters were operated as monocultures of leptothrix discophora, the predominant organism in mature mn oxidising biofilms. biologically mediated mn bioaccumulation was successfully modelled in both filter systems. the data obtained showed that in the small-sc ...	2004	15026240
biological treatment of mn(ii) and fe(ii) containing groundwater: kinetic considerations and product characterization.	in the present article, the treatment of groundwater containing mn(ii) and fe(ii) has been investigated. the biological oxidation of mn(ii) and fe(ii) in upflow filtration units comprised the applied experimental technique. the oxidation processes were mediated by specific bacteria, namely the leptothrix ochracea and gallionella ferruginea, which belong to the general category of manganese and iron oxidizing bacteria. this work was focused on the characterization of the products of biological ox ...	2004	15026247
microbial fuel cell using anaerobic respiration as an anodic reaction and biomineralized manganese as a cathodic reactant.	we have operated a microbial fuel cell in which glucose was oxidized by klebsiella pneumoniae in the anodic compartment, and biomineralized manganese oxides, deposited by leptothrix discophora, were electrochemically reduced in the cathodic compartment. in the anodic compartment, to facilitate the electron transfer from glucose to the graphite electrode, we added a redox mediator, 2-hydroxy-1,4-naphthoquinone. we did not add any redox mediator to the cathodic compartment because the biomineraliz ...	2005	16047807
structural analysis of the sheath of a sheathed bacterium, leptothrix cholodnii.	leptothrix cholodnii is an aerobic sheath-forming bacterium often found in oligotrophic and metal-rich aquatic environments. the sheath of this bacterium was isolated by selectively lysing the cells. glycine and cysteine were the major amino acids of the sheath. the sheath was readily dissolved in hydrazine, and a polysaccharide substituted with cysteine was recovered from the solution. galactosamine, glucosamine and galacturonic acid were detected in the hydrazinolysate by gas liquid chromatogr ...	2005	16214212
micrococcus tetragenus: an unusual commensal in a cervical smear.		2005	16303049
a new bacterial strain mediating as oxidation in the fe-rich biofilm naturally growing in a groundwater fe treatment pilot unit.	a bacterial strain b2 that oxidizes arsenite into arsenate was isolated from the biofilm growing in a biological groundwater treatment process used for fe removal. this strain is phylogenetically and morphologically different from the genus leptothrix commonly encountered in biological iron oxidation processes. t-rflp fingerprint of the biofilm revealed that this isolated strain b2 corresponds to the major population of the bacterial community in the biofilm. therefore, it is probably one of the ...	2006	16426662
identification of 2-(cysteinyl)amido-2-deoxy-d-galacturonic acid residue from the sheath of leptothrix cholodnii.	the sheath of leptothrix cholodnii is a glycoconjugate composed of a polysaccharide and a peptide rich in cysteine. in this study, structural determination of the hydrazinolyzate of the sheath was carried out. since the hydrazinolyzate is a polysaccharide incorporated with cysteine, it was s-derivatized with a thiol-specific fluorogenic reagent, 4-(aminosulfonyl)-7-fluoro-2,1,3-benzoxadiazole (abd-f). fluorescent fragments were purified by hplc, and their structures were analyzed by mass spectro ...	2006	16717434
a putative multicopper protein secreted by an atypical type ii secretion system involved in the reduction of insoluble electron acceptors in geobacter sulfurreducens.	extracellular electron transfer onto fe(iii) oxides in geobacter sulfurreducens is considered to require proteins that must be exported to the outer surface of the cell. in order to investigate this, the putative gene for oxpg, the pseudopilin involved in a type ii general secretion pathway of gram-negative bacteria, was deleted. the mutant was unable to grow with insoluble fe(iii) oxide as the electron acceptor. growth on soluble fe(iii) was not affected. an analysis of proteins that accumulate ...	2006	16849792
methylibium petroleiphilum gen. nov., sp. nov., a novel methyl tert-butyl ether-degrading methylotroph of the betaproteobacteria.	a gram-negative, rod-shaped, motile, non-pigmented, facultative aerobe that grew optimally at ph 6.5 and 30 degrees c (strain pm1t) was isolated for its ability to completely degrade the gasoline additive methyl tert-butyl ether. analysis of the 16s rrna gene sequence indicated that this bacterium was a member of the class betaproteobacteria in the sphaerotilus-leptothrix group. the 16s rrna gene sequence identity to other genera in this group, leptothrix, aquabacterium, roseateles, sphaerotilus ...	2006	16627642
manganese oxides: parallels between abiotic and biotic structures.	a large number of microorganisms are responsible for the oxidation of mn(2+)((aq)) to insoluble mn(3+/4+) oxides (mno(x)()) in natural aquatic systems. this paper reports the structure of the biogenic mno(x)(), including a quantitative analysis of cation vacancies, formed by the freshwater bacterium leptothrix discophora sp6 (sp6-mno(x)()). the structure and the morphology of sp6-mno(x)() were characterized by transmission electron microscopy (tem), x-ray absorption spectroscopy (xas), including ...	2006	16925437
aquincola tertiaricarbonis gen. nov., sp. nov., a tertiary butyl moiety-degrading bacterium.	strains l10(t), l108 and cip i-2052 were originally obtained from methyl tert-butyl ether (mtbe)-contaminated groundwater and from a wastewater treatment plant, respectively. all share the ability to grow on tert-butanol, an intermediate of mtbe degradation. cells are strictly aerobic, motile by a polar flagellum and exhibit strong pili formation. poly beta-hydroxybutyrate (phb) granules are formed. the dna g+c content is 69-70.5 mol% and the main ubiquinone is q-8. the major cellular fatty acid ...	2007	17551046
control of ferrous iron oxidation within circumneutral microbial iron mats by cellular activity and autocatalysis.	ferrous iron (fe2+) oxidation by microbial iron mat samples, dominated by helical stalks of gallionella ferruginea or sheaths of leptothrix ochracea, was examined. pseudo-first-order rate constants for the microbial mat samples ranged from 0.029 +/- 0.004 to 0.249 +/- 0.042 min(-1) and correlated well with iron content (r2 = 0.929). rate constants for na azide-treated (1 mm) samples estimated autocatalytic oxidation by iron oxide stalks or sheaths, with values ranging from 0.016 +/- 0.008 to 0.0 ...	2007	17937285
carbon and steel surfaces modified by leptothrix discophora sp-6: characterization and implications.	leptothrix discophora sp-6, a type of manganese(mn)-oxidizing bacteria, has been known to accumulate mn oxides from the aqueous environment and thus play a key role in microbiologically influenced corrosion by increasing the electrochemical potential of steel and other metals. similarly, this bacterium was found to modify the surface of glassy carbon in aqueous solution and increase its potential (i.e., ennoblement). in the latter case, biomineralized mn oxides can be used as cathodic reactants ...	2007	18186327
biogeochemistry and community composition of iron- and sulfur-precipitating microbial mats at the chefren mud volcano (nile deep sea fan, eastern mediterranean).	in this study we determined the composition and biogeochemistry of novel, brightly colored, white and orange microbial mats at the surface of a brine seep at the outer rim of the chefren mud volcano. these mats were interspersed with one another, but their underlying sediment biogeochemistries differed considerably. microscopy revealed that the white mats were granules composed of elemental s filaments, similar to those produced by the sulfide-oxidizing epsilonproteobacterium "candidatus arcobac ...	2008	18378658
prosthecobacter fluviatilis sp. nov., which lacks the bacterial tubulin btuba and btubb genes.	leptothrix cholodnii is a sheathed bacterium often found in metal-rich and oligotrophic aquatic environments. a bacterial strain that is able to degrade the naoh-treated sheath of l. cholodnii was isolated. the isolate was a gram-negative, aerobic and prosthecate bacterium. the optimum growth temperature and ph were 30 degrees c and ph 7.0, respectively. the dna g+c content was 62.9 mol%. the major respiratory quinone was mk-6. a phylogenetic analysis based on the 16s rrna gene indicated that th ...	2008	18599695
significance of a diagnosis of microorganisms on pap smear.	the pap smear has been in use for more than half a century as the primary screening test for preinvasive and invasive lesions of the uterine cervix. although not the primary use and an imperfect test, it can be extremely useful in the diagnosis of some microorganisms. this review focuses on the use of the pap smear in the diagnosis of several microorganisms including actinomyces, chlamydia trachomatis, candida, trichomonas vaginalis, leptothrix vaginalis, herpes simplex virus, the causative agen ...	2008	18162813
aerobic mtbe biodegradation in the presence of btex by two consortia under batch and semi-batch conditions.	this study explores the effect of microbial consortium composition and reactor configuration on methyl tert-butyl ether (mtbe) biodegradation in the presence of benzene, toluene, ethylbenzene and p-xylenes(btex). mtbe biodegradation was monitored in the presence and absence of btex in duplicate batch reactors inoculated with distinct enrichment cultures: mtbe only (mo-originally enriched on mtbe) and/or mtbe btex (mb-originally enriched on mtbe and btex). the mo culture was also applied in a sem ...	2008	17562189
manganese-oxidizing bacteria mediate the degradation of 17α-ethinylestradiol.	manganese (ii) and manganese-oxidizing bacteria were used as an efficient biological system for the degradation of the xenoestrogen 17α-ethinylestradiol (ee2) at trace concentrations. mn(2+)-derived higher oxidation states of mn (mn(3+), mn(4+)) by mn(2+)-oxidizing bacteria mediate the oxidative cleavage of the polycyclic target compound ee2. the presence of manganese (ii) was found to be essential for the degradation of ee2 by leptothrix discophora, pseudomonas putida mb1, p. putida mb6 and p. ...	2008	21261871
bacteria associated with iron seeps in a sulfur-rich, neutral ph, freshwater ecosystem.	the freshwater nature reserve de bruuk is an iron- and sulfur-rich minerotrophic peatland containing many iron seeps and forms a suitable habitat for iron and sulfur cycle bacteria. analysis of 16s rrna gene-based clone libraries showed a striking correlation of the bacterial population of samples from this freshwater ecosystem with the processes of iron reduction (genus geobacter), iron oxidation (genera leptothrix and gallionella) and sulfur oxidation (genus sulfuricurvum). results from fluore ...	2008	18754044
[ferrous-manganese oxidizing bacteria from the nature water].	glass slides were hanged into a canal to acquire the ferrous-manganese oxidizing bacteria settled bio-film. two isolated methods for ferrous-manganese oxidizing bacteria with special iron-manganese oxidizing matrix from the bio-film were tested. element component of bacteria product and sheath structure of bacteria were analyzed. with two methods, plate cultivation and the novel semi-solid in situ cultivation method, strains belong to family leptothrix were isolated. xrf showed that the amorphou ...	2008	18763517
manganese removal during bench-scale biofiltration.	as biological manganese (mn) removal becomes a more popular water treatment technology, there is still a large gap in understanding the key mechanisms and range of operational characteristics. this research aimed to expand on previous bench-scale experiments by directly comparing small filtration columns inoculated with indigenous biofilms from a mn filtration plant and filtration columns inoculated with a liquid suspension of leptothrix discophora sp-6. batch tests found that in the absence of ...	2008	18809196
biomineralisation of manganese on titanium surfaces exposed to seawater.	a 2-year long study was carried out to isolate and characterise various bacterial species present in the biofilm formed on titanium surfaces exposed to seawater and to assess the manganese oxidizing potential of the marine isolates. the amount of manganese present in the biofilm was also measured using atomic absorption spectrometry (aas). the results showed that titanium was susceptible to biofouling. more than 50% of the culturable marine bacterial isolates were capable of bringing about oxida ...	2008	18568665
bacterial diversity in synovial fluids of patients with tmd determined by cloning and sequencing analysis of the 16s ribosomal rna gene.	the purpose of this study was to examine the presence of bacteria in synovial fluids from patients with temporomandibular joint disorder (tmd) by polymerase chain reaction (pcr) targeting the 16s ribosomal rna (rrna) gene, followed by cloning and sequencing.	2008	18206402
microbial iron redox cycling in a circumneutral-ph groundwater seep.	the potential for microbially mediated redox cycling of iron (fe) in a circumneutral-ph groundwater seep in north central alabama was studied. incubation of freshly collected seep material under anoxic conditions with acetate-lactate or h(2) as an electron donor revealed the potential for rapid fe(iii) oxide reduction (ca. 700 to 2,000 micromol liter(-1) day(-1)). fe(iii) reduction at lower but significant rates took place in unamended controls (ca. 300 micromol liter(-1) day(-1)). culture-based ...	2009	19047399
iron requirement for mn(ii) oxidation by leptothrix discophora ss-1.	a common form of biocatalysis of mn(ii) oxidation results in the formation of biogenic mn(iii, iv) oxides and is a key reaction in the geochemical cycling of mn. in this study, we grew the model mn(ii)-oxidizing bacterium leptothrix discophora ss-1 in media with limited iron (0.1 microm iron/5.8 mm pyruvate) and sufficient iron (0.2 microm iron/5.8 mm pyruvate). the influence of iron on the rate of extracellular mn(ii) oxidation was evaluated. cultures in which cell growth was limited by iron ex ...	2009	19114505
inhella inkyongensis gen. nov., sp. nov., a new freshwater bacterium in the order burkholderiales.	a freshwater bacterium, designated imcc1713(t), was isolated from a highly eutrophic artificial pond. cells of the strain were gram-negative, chemoheterotrophic, polybeat and obligately aerobic short rods that were motile with a single polar flagellum. the 16s rrna gene sequence similarity analysis showed that the novel strain was most closely related to the species roseateles depolymerans (96.3%), mitsuaria chitosanitabida (96.2%), ideonella dechloratans (96.2%), and pelomonas saccharophila (96 ...	2009	19190402
atomic-scale structure of biogenic materials by total x-ray diffraction: a study of bacterial and fungal mnox.	biogenic materials are produced by microorganisms and are typically found in a nanophase state. as such, they are difficult to characterize structurally. in this report, we demonstrate how high-energy x-ray diffraction and atomic pair distribution function analysis can be used to determine the atomic-scale structures of mno(x) produced by bacteria and fungi. these structures are well-defined, periodic, and species-specific, built of mn-o(6) octahedra forming birnessite-type layers and todorokite ...	2009	19236083
zn sorption mechanisms onto sheathed leptothrix discophora and the impact of the nanoparticulate biogenic mn oxide coating.	zinc sorption on sheathed leptothrix discophora bacterium, the isolated extracellular polymeric substances (eps) sheath, and mn oxide-coated bacteria was investigated with macroscopic and spectroscopic techniques. complexation with l. discophora was dominated by the outer membrane phosphoryl groups of the phospholipid bilayer while sorption to isolated eps was dominated by carboxyl groups. precipitation of nanoparticulate mn oxide coatings on the cell surface increased site capacity by over twen ...	2009	19268965
removal of phosphorus from solution using biogenic iron oxides.	phosphorus removal by biogenic iron oxides was investigated, providing an initial characterization of a potentially regenerable iron-rich sorbent. the biogenic iron oxides were collected from a wetland ecosystem and were dominated by the sheaths of leptothrix ochracea. sorption kinetics followed a pseudo-1st order model (r(2)=0.998) with a rate constant of 0.154+/-0.013h(-1). the langmuir isotherm adequately described sorption for all samples (r(2)=0.923-0.981); the freundlich model was a better ...	2009	19298996
ideonella azotifigens sp. nov., an aerobic diazotroph of the betaproteobacteria isolated from grass rhizosphere soil, and emended description of the genus ideonella.	strain 1a22t, a nitrogen-fixing bacterium, was isolated from soil associated with the rhizosphere of a perennial grass growing in a fallow agricultural field in ithaca, new york, usa. analysis of the 16s rrna gene sequence placed the strain in the rubrivivax-roseateles-leptothrix-azohydromonas-aquincola-ideonella branch of the betaproteobacteria and the closest characterized relative was the type strain of ideonella dechloratans (97.7% 16s rrna sequence similarity). cells of strain 1a22t were gr ...	2009	19567574
microbiologically-influenced corrosion of orthodontic alloys: a review of proposed mechanisms and effects.	to summarise the currently available evidence on the effects of microorganisms on the corrosion processes of biomaterials, with specific relevance to orthodontic alloys.	2009	19634466
rapid monomerization of poly(butylene succinate)-co-(butylene adipate) by leptothrix sp.	for rapid monomerization of biodegradable plastics, various microorganisms were screened and tb-71 was selected as the best strain. tb-71 degraded solid poly(butylene succinate)-co-(butylene adipate) (pbsa), poly(ethylene succinate), and poly(epsilon-caprolactone) but not poly(butylene succinate), poly(2-hydroxybutylate-co-valerate) or poly(lactic acid). esterase activity was observed in the culture broth during pbsa degradation, which was specifically induced by pbsa. analysis of the degradatio ...	2009	19914585
chemical modification of biogenous iron oxide to create an excellent enzyme scaffold.	the biogenous iron oxide (bio) from leptothrix ochracea was transformed to an organic-inorganic hybrid support to prepare an excellent immobilized enzyme showing high catalytic performance.	2010	20066267
performance and microbial community composition dynamics of aerobic granular sludge from sequencing batch bubble column reactors operated at 20 degrees c, 30 degrees c, and 35 degrees c.	two bubble column sequencing batch reactors fed with an artificial wastewater were operated at 20 degrees c, 30 degrees c, and 35 degrees c. in a first stage, stable granules were obtained at 20 degrees c, whereas fluffy structures were observed at 30 degrees c. molecular analysis revealed high abundance of the operational taxonomic unit 208 (otu 208) affiliating with filamentous bacteria leptothrix spp. at 30 degrees c, an otu much less abundant at 20 degrees c. the granular sludge obtained at ...	2010	20461512
an uncertain role for cu(ii) in stimulating mn(ii) oxidation by leptothrix discophora ss-1.	in an effort to improve understanding of the role of cu(ii) in bacterial mn(ii) oxidation, a model mn(ii)-oxidizing bacterium, leptothrix discophora ss-1, was grown in presence of toxic and non-toxic concentrations of cu(ii), cd(ii) and mn(ii). mn(ii)-oxidizing activity increased by 40% when cells were grown in the presence of 0.05 microm of cu(ii) and increased twofold at 0.18 microm cu(ii). toxic levels of cd(ii) did not stimulate mn(ii) oxidizing activity, indicating that mn(ii) oxidation is ...	2010	21063867
solubilization and structural determination of a glycoconjugate which is assembled into the sheath of leptothrix cholodnii.	the sheath of leptothrix cholodnii is constructed from a structural glycoconjugate, a straight-chained amphoteric heteropolysaccharide modified with glycine and cysteine. though the structure of the glycan core is already determined, its modifications with amino acids and other molecules are not fully resolved. in this study, we aimed to determine the chemical structure of the glycoconjugate as a whole. enantiomeric determination of cysteine in the sheath was performed and as a result, l-cystein ...	2010	20026345
virus removal by biogenic cerium.	the rare earth element cerium has been known to exert antifungal and antibacterial properties in the oxidation states +iii and +iv. this study reports on an innovative strategy for virus removal in drinking water by the combination of ce(iii) on a bacterial carrier matrix. the biogenic cerium (bio-ce) was produced by addition of aqueous ce(iii) to actively growing cultures of either freshwater manganese-oxidizing bacteria (mob) leptothrix discophora or pseudomonas putida mnb29. x-ray absorption ...	2010	20704235
development of a small-scale bioreactor method to monitor the molecular diversity and environmental impacts of bacterial biofilm communities from an acid mine drainage impacted creek.	shamokin creek is a tributary of the susquehanna river in central pennsylvania that is heavily impacted by the acid mine drainage (amd) caused by the oxidation of pyrite from the region's extensive anthracite coal mining industry. recent studies have begun to characterize the microbial communities present in this and other amd-impacted waters, but varying environmental conditions have complicated attempts to determine the ecological impacts of individual bacterial species within these communitie ...	2011	21821067
characterization of gentisate-1,2-dioxygenase in the third naphthalene catabolic gene cluster of polaromonas naphthalenivorans cj2: role in naphthalene degradation.	polaromonas naphthalenivorans strain cj2 metabolizes naphthalene via the gentisate pathway and recently has been shown to carry a third copy of gentisate dioxygenase (gdo), encoded by nagi3, within a previously uncharacterized naphthalene catabolic gene cluster. the role of this cluster (especially nagi3) in naphthalene metabolism of strain cj2 was investigated by documenting patterns in regulation, transcription, and enzyme activity. transcriptional analysis of wild-type cells showed the third ...	2011	21737495
active n(2) o emission from bacterial microbiota of andisol farmland and characterization of some n(2) o emitters.	andisol in farmland located in hokkaido, japan, is known to actively flux nitrous oxide (n(2) o) during the spring to summer seasons. using a culturing system which mimics farm soils, nitrous oxide (n(2) o) emission potentials of the soils or soil microorganisms were investigated. a total of thirty-three soil samples from the farmland showed high n(2) o production potential, of which the maximum level of n(2) o emission was 3.69 μg per ml of the cultured medium per day (ml(-1) d(-1) ) in the as ...	2011	22144290
[study on separation of bacteria on the surface of mature manganese sand and the ability of oxidating fe2+ and mn2+].	seven strains of bacteria which were separated from the active membrane on the mature manganese sand which are from different power plants. after identifying they are leptothrix, sphaerotilus and siderocapsa. studies show that the three strains of bacteria have a better removal of fe2+, in which siderocapsa no. 1 is the best. leptothrix and siderocapsa have a good removal of mn2+ siderocapsa no. 1 has the highest removal rate for mn2+, siderocapsa no. 2 is secondary. the mixture of separately cu ...	2011	21404675
Structural and spatial associations between Fe, O, and C in the network structure of the Leptothrix ochracea sheath surface.	The structural and spatial associations of Fe with O and C in the outer coat fibers of the Leptothrix ochracea sheath were shown to be substantially similar to the stalk fibers of Gallionella ferruginea, i.e., a central C core, probably of bacterial origin, and aquatic Fe interacting with O at the surface of the core.	2011	21926209
what's new is old: resolving the identity of leptothrix ochracea using single cell genomics, pyrosequencing and fish.	leptothrix ochracea is a common inhabitant of freshwater iron seeps and iron-rich wetlands. its defining characteristic is copious production of extracellular sheaths encrusted with iron oxyhydroxides. surprisingly, over 90% of these sheaths are empty, hence, what appears to be an abundant population of iron-oxidizing bacteria, consists of relatively few cells. because l. ochracea has proven difficult to cultivate, its identification is based solely on habitat preference and morphology. we utili ...	2011	21437234
isolation of a leptothrix strain, oums1, from ocherous deposits in groundwater.	leptothrix species in aquatic environments produce uniquely shaped hollow microtubules composed of aquatic inorganic and bacterium-derived organic hybrids. our group termed this biologically derived iron oxide as "biogenous iron oxide (biox)". the artificial synthesis of most industrial iron oxides requires massive energy and is costly while biox from natural environments is energy and cost effective. the biox microtubules could potentially be used as novel industrial functional resources for ca ...	2011	21643851
draft genome sequences of the biocontrol bacterium mitsuaria sp. strain h24l5a.	mitsuaria sp. strain h24l5a is a plant-associated bacterium with proven capacities to suppress plant pathogens. here, we report the draft genome sequences and automatic annotation of h24l5a. comparative genomic analysis indicates h24l5a's similarity to the leptothrix and methylibium species, as well as several genes potentially contributing to its biocontrol activities.	2012	22247532