Envelope ultrastructure of uncultured naturally occurring magnetotactic cocci.


:Magnetotactic bacteria are microorganisms that respond to magnetic fields. We studied the surface ultrastructure of uncultured magnetotactic cocci collected from a marine environment by transmission electron microscopy using freeze-fracture and freeze-etching. All bacteria revealed a Gram-negative cell wall. Many bacteria possessed extensive capsular material and a S-layer formed by particles arranged with hexagonal symmetry. No indication of a metal precipitation on the surface of these microorganisms was observed. Numerous membrane vesicles were observed on the surface of the bacteria. Flagella were organized in bundles originated in a depression on the surface of the cells. Occasionally, a close association of the flagella with the magnetosomes that remained attached to the replica was observed. Capsules and S-layers are common structures in magnetotactic cocci from natural sediments and may be involved in inhibition of metal precipitation on the cell surface or indirectly influence magnetotaxis.


FEMS Microbiol Lett


Freitas F,Keim CN,Kachar B,Farina M,Lins U





Has Abstract


2003-02-14 00:00:00














  • Growth and adhesion of Enterococcus faecium L-forms.

    abstract::Comparisons of growth and surface colonisation of Enterococcus faecium L-forms and their cell-walled forms were undertaken to produce information about their ability to form sessile cells. The growth of L-forms in liquid culture was slower than that of the parent. This was reflected in their longer lag phase and slowe...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Jass J,Phillips LE,Allan EJ,Costerton JW,Lappin-Scott HM

    更新日期:1994-01-15 00:00:00

  • Characterization of a large novel phage-like plasmid in Salmonella enterica serovar Typhimurium.

    abstract::Salmonella enterica serovar Typhimurium is a food-borne pathogen and a leading cause of gastroenteritis in humans. Recently, we sequenced a phage-type DT108 strain (L945) and found reads with high similarity to both Salmonella typhi strain CT18 plasmid pHCM2 and bacteriophage SSU5. In this study, we completely sequenc...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Octavia S,Sara J,Lan R

    更新日期:2015-04-01 00:00:00

  • Genetic analysis and pathogenicity of different sequence types of Streptococcus suis isolated from pigs in southern China.

    abstract::In this study, 52 Streptococcus suis isolates from pigs in southern China were divided into four known sequence types (STs) and six new STs, using multilocus sequence typing. Ten representative isolates were selected from 10 STs for the analysis of whole genome sequences. Virulence was assessed in 10 isolates, which w...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Peng L,Lin M,Huang Z,Guo S,Sun H,Yang X

    更新日期:2020-03-01 00:00:00

  • Lactobacillus reuteri A9 and Lactobacillus mucosae A13 isolated from Chinese superlongevity people modulate lipid metabolism in a hypercholesterolemia rat model.

    abstract::While there is strong evidence showing that many food-borne probiotics regulate cholesterol metabolism, few studies have examined how probiotics of human origin affect cholesterol metabolism. Because people living in so-called 'longevity villages' are unlikely to have hypercholesterolemia, we hypothesized that probiot...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Jiang J,Feng N,Zhang C,Liu F,Zhao J,Zhang H,Zhai Q,Chen W

    更新日期:2019-12-01 00:00:00

  • Optimized conditions for the fermentation of Helicobacter pylori and production of vacuolating cytotoxin.

    abstract::We report here improvements to the growth media and fermentation conditions which result in a substantial increase of Helicobacter pylori growth and in the enhanced production of vacuolating cytotoxin. Addition of glucose to the medium resulted in the increase of cell yield, cell viability and a significant improvemen...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Marchini A,Massari P,Manetti R,Olivieri R

    更新日期:1994-11-15 00:00:00

  • Transformation of a type 4 encapsulated strain of Streptococcus pneumoniae.

    abstract::Streptococcus pneumoniae strain JNR.7/87 is a highly virulent, type 4 encapsulated Gram-positive bacterium whose transformability has not been tested previously, and whose genome is currently being sequenced. The strain was transformed at very low efficiency by addition of exogenous competence-stimulating peptide: How...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Bricker AL,Camilli A

    更新日期:1999-03-15 00:00:00

  • A new root-nodulating symbiont of the tropical legume Sesbania, Rhizobium sp. SIN-1, is closely related to R. galegae, a species that nodulates temperate legumes.

    abstract::Rhizobium sp. SIN-1, isolated in India from root nodules on the tropical legume Sesbania aculeata, also induces nitrogen-fixing nodules on roots of S. macrocarpa, S. speciosa, S. procumbens, S. punicea, S. rostrata, and Vigna unguiculata. Unlike Azorhizobium caulinodans, SIN-1 does not induce stem nodules on S. rostra...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Rana D,Krishnan HB

    更新日期:1995-12-01 00:00:00

  • Clonal turnover of enterohemorrhagic Escherichia coli O157:H7 in experimentally infected cattle.

    abstract::A total of 401 enterohemorrhagic Escherichia coli (EHEC) O157:H7 isolates from two experimentally infected calves were analyzed using molecular biological methods. Genetic differences detected by pulsed-field gel electrophoresis were observed between the inoculated and recovered strains as early as 1 day post inoculat...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Akiba M,Sameshima T,Nakazawa M

    更新日期:2000-03-01 00:00:00

  • Characterization of ISR region and development of a PCR assay for rapid detection of the fish pathogen Tenacibaculum soleae.

    abstract::The aims of this work were to characterize the 16S-23S internal spacer region of the fish pathogen Tenacibaculum soleae and to develop a PCR assay for its identification and detection. All T. soleae strains tested displayed a single internal spacer region class, containing tRNA(I) (le) and tRNA(A) ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: López JR,Hamman-Khalifa AM,Navas JI,de la Herran R

    更新日期:2011-11-01 00:00:00

  • The Listeria monocytogenes transposon Tn6188 provides increased tolerance to various quaternary ammonium compounds and ethidium bromide.

    abstract::Tolerance of the foodborne pathogen Listeria monocytogenes to sublethal concentrations of disinfectants has been frequently reported. Particularly, quaternary ammonium compounds (QACs) such as benzalkonium chloride (BC) are often used in disinfectants and also as antiseptics in food industry and hospitals. Recently, w...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Müller A,Rychli K,Zaiser A,Wieser C,Wagner M,Schmitz-Esser S

    更新日期:2014-12-01 00:00:00

  • Adherence to host extracellular matrix and serum components by Enterococcus faecium isolates of diverse origin.

    abstract::Enterococcus faecium has emerged as an important cause of nosocomial infections over the last two decades. We recently demonstrated collagen type I (CI) as a common adherence target for some E. faecium isolates and a significant correlation was found to exist between acm-mediated CI adherence and clinical origin. Here...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Zhao M,Sillanpää J,Nallapareddy SR,Murray BE

    更新日期:2009-11-01 00:00:00

  • Clonal relationships among Escherichia coli serogroup 06 isolates from human and animal infections.

    abstract::The clonal relationship of thirty E. coli strains of 0 antigen serotype 06 isolated from human, dog, pig or cow infections were investigated. Two main clones with serotypes 06 : H1 or 06 : H31, H- were identified. Isolates from humans, dogs, pigs and cows were found in both clones, indicating that animals are a possib...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Cherifi A,Contrepois M,Picard B,Goullet P,Orskov I,Orskov F,De Rycke J

    更新日期:1991-05-15 00:00:00

  • Hydroxyurea inhibits intracellular Toxoplasma gondii multiplication.

    abstract::Tachyzoites of Toxoplasma gondii multiply within the parasitophorous vacuole (PV) until the lysis of the host cell. This study was undertaken to evaluate the effect of hydroxyurea (a specific drug that arrests cell division at G1/S phase) on the multiplication of T. gondii tachyzoites in infected Vero cells. Infected ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: de Melo EJ,Mayerhoffer RO,de Souza W

    更新日期:2000-04-01 00:00:00

  • Biodegradation of phenanthrene by Alcaligenes sp. strain PPH: partial purification and characterization of 1-hydroxy-2-naphthoic acid hydroxylase.

    abstract::Alcaligenes sp. strain PPH degrades phenanthrene via 1-hydroxy-2-naphthoic acid (1-H2NA), 1,2-dihydroxynaphthalene (1,2-DHN), salicylic acid and catechol. Enzyme activity versus growth profile and heat stability studies suggested the presence of two distinct hydroxylases, namely 1-hydroxy-2-naphthoic acid hydroxylase ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Deveryshetty J,Phale PS

    更新日期:2010-10-01 00:00:00

  • Characterization of the proteins encoded by the Bacillus subtilis yoxA-dacC operon.

    abstract::In Bacillus subtilis, the yoxA and dacC genes were proposed to form an operon. The yoxA gene was overexpressed in Escherichia coli and its product fused to a polyhistidine tag was purified. An aldose-1-epimerase or mutarotase activity was measured with the YoxA protein that we propose to rename as GalM by analogy with...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Duez C,Zervosen A,Teller N,Melkonian R,Banzubazé E,Bouillenne F,Luxen A,Frère JM

    更新日期:2009-11-01 00:00:00

  • A new vector, pGID052, for genetic transfer in Oenococcus oeni.

    abstract::Despite the large number of techniques available for the transformation of bacteria, several species are still resistant to the introduction of foreign DNA. Oenococcus oeni are among the organisms that are particularly refractory to transformation. However, conjugal experiments from Lactococcus lactis to O. oeni with ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Beltramo C,Oraby M,Bourel G,Garmyn D,Guzzo J

    更新日期:2004-07-01 00:00:00

  • Characterization of the promoter region of a cell-adhesion protein gene derived from the basidiomycete Lentinus edodes.

    abstract::An analysis of the 2 kb nucleotide sequence including the 5'-flanking region of a cell-adhesion protein-encoding gene (mfbA) isolated from the basidiomycete Lentinus edodes revealed that the promoter region contains a TATA box, a GC box, a CAAT box, a CT-rich sequence element, a TATA box, two CT-rich sequences, and a ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Kondoh O,Shishido K

    更新日期:1995-08-01 00:00:00

  • A role for carbon catabolite repression in the metabolism of phosphonoacetate by Agromyces fucosus Vs2.

    abstract::A strain of Agromyces fucosus, designated Vs2, metabolized a range of organophosphonate compounds as sole phosphorus sources for growth and metabolized phosphonoacetate as a sole carbon, energy and phosphorus source for growth. With phosphonoacetate as the sole phosphorus source and a pyruvate carbon source, transient...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: O'Loughlin SN,Graham RL,McMullan G,Ternan NG

    更新日期:2006-08-01 00:00:00

  • Cell-fies: sharing microbiology with global audiences through Instagram.

    abstract::For the dissemination of microbiology and science in general, social media is an underutilized but increasingly powerful tool, and one that transcends traditional avenues for scientific outputs. In order to reach and potentially inspire a deeply interested and general public, scientists should engage with platforms su...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Hines HN

    更新日期:2019-08-01 00:00:00

  • Attachment of bacteria to the roots of higher plants.

    abstract::Attachment of soil bacteria to plant cells is supposedly the very early step required in plant-microbe interactions. Attachment also is an initial step for the formation of microbial biofilms on plant roots. For the rhizobia-legume symbiosis, various mechanisms and diverse surface molecules of both partners have been ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章,评审


    authors: Rodríguez-Navarro DN,Dardanelli MS,Ruíz-Saínz JE

    更新日期:2007-07-01 00:00:00

  • Multiplicity and expression of xylanases in the rumen fungus Neocallimastix frontalis.

    abstract::The time course production of xylanolytic enzymes by the rumen anaerobic fungus Neocallimastix frontalis was studied during growth on different carbon sources and revealed using isoelectric focusing and immunoblotting. A constant low level of endoxylanase expression was observed in glucose medium. A high level of xyla...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Gomez de Segura B,Durand R,Fèvre M

    更新日期:1998-07-01 00:00:00

  • Differential expression of putative drug resistance genes in Mycobacterium tuberculosis clinical isolates.

    abstract::Understanding drug resistance in Mycobacterium tuberculosis requires an integrated analysis of strain lineages, mutations and gene expression. Previously, we reported the differential expression of esxG, esxH, infA, groES, rpmI, rpsA and lipF genes in a sensitive M. tuberculosis strain and in a multidrug-resistant cli...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: González-Escalante L,Peñuelas-Urquides K,Said-Fernández S,Silva-Ramírez B,Bermúdez de León M

    更新日期:2015-12-01 00:00:00

  • A leader open reading frame is essential for the expression in Escherichia coli of GC-rich leuB gene of an extreme thermophile, Thermus thermophilus.

    abstract::To improve expression efficiency of the leuB gene of an extreme thermophile. Thermus thermophilus, in Escherichia coli, the gene was placed under a potent promoter, tac. However, the expression was hardly improved, despite increased transcription. The expression under tac promoter was significantly improved by introdu...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Ishida M,Oshima T

    更新日期:1996-01-01 00:00:00

  • Brucella Omp2a and Omp2b porins: single channel measurements and topology prediction.

    abstract::Brucella usually carry two highly homologous genes (omp2a and omp2b) for porin-like proteins. In several B. abortus biovars the omp2a gene has a large deletion compared to other Brucella omp2's. In this study we have measured Omp2 pore activity in planar bilayers. Omp2b exhibits well-defined trimeric channel activity ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Mobasheri H,Ficht TA,Marquis H,Lea EJ,Lakey JH

    更新日期:1997-10-01 00:00:00

  • The genome of the Erwinia amylovora phage PhiEaH1 reveals greater diversity and broadens the applicability of phages for the treatment of fire blight.

    abstract::The enterobacterium Erwinia amylovora is the causal agent of fire blight. This study presents the analysis of the complete genome of phage PhiEaH1, isolated from the soil surrounding an E. amylovora-infected apple tree in Hungary. Its genome is 218 kb in size, containing 244 ORFs. PhiEaH1 is the second E. amylovora in...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Meczker K,Dömötör D,Vass J,Rákhely G,Schneider G,Kovács T

    更新日期:2014-01-01 00:00:00

  • A variation of the amplified-fragment length polymorphism (AFLP) technique using three restriction endonucleases, and assessment of the enzyme combination BglII-MfeI for AFLP analysis of Salmonella enterica subsp. enterica isolates.

    abstract::We have performed amplified-fragment length polymorphism (AFLP) fingerprinting on a collection of Salmonella enterica subsp. enterica serovar typhimurium strains with a restriction endonuclease combination (BglII and MfeI) that has previously been used successfully for typing Campylobacter jejuni isolates with high re...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Lindstedt BA,Heir E,Vardund T,Kapperud G

    更新日期:2000-08-01 00:00:00

  • Biochemical, electrophoretic and immunohistochemical aspects of malate dehydrogenase in truffles (Ascomycotina).

    abstract::The malate dehydrogenase (MDH; EC; L-malate-NAD(+)-oxidoreductase) activities of truffles of the genus Tuber (Tuber melanosporum Vittad., Tuber brumale Vittad., Tuber aestivum Vittad., Tuber magnatum Pico, Tuber rufum Pico) have been characterized with regard to the K(m) and V(max) values in the direct and re...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Zarivi O,Cesare P,Aimola P,Ragnelli AM,Scirri C,Cimini A,Bonfigli A,Pacioni G,Miranda M

    更新日期:2000-04-15 00:00:00

  • Not all animals need a microbiome.

    abstract::It is often taken for granted that all animals host and depend upon a microbiome, yet this has only been shown for a small proportion of species. We propose that animals span a continuum of reliance on microbial symbionts. At one end are the famously symbiont-dependent species such as aphids, humans, corals and cows, ...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章,评审


    authors: Hammer TJ,Sanders JG,Fierer N

    更新日期:2019-05-01 00:00:00

  • Production of monoclonal antibodies against a hemagglutinin/protease of Vibrio cholerae non-01.

    abstract::Two hybridoma cell lines producing monoclonal antibodies (MAbs) against a hemagglutinin/protease (HA/P) from Vibrio cholerae non-01 were produced and characterized. The two MAbs contained the kappa light chain and were IgG1 type. They similarly neutralized HA/P protease activity derived from both V. cholerae non-01 an...

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章


    authors: Honda T,Hata-Naka A,Lertpocasombat K,Miwatani T

    更新日期:1991-03-01 00:00:00

  • Initiation of sporulation in Clostridium difficile: a twist on the classic model.

    abstract::The formation of dormant endospores is a complex morphological process that permits long-term survival in inhospitable environments for many Gram-positive bacteria. Sporulation for the anaerobic gastrointestinal pathogen Clostridium difficile is necessary for survival outside of the gastrointestinal tract of its host....

    journal_title:FEMS microbiology letters

    pub_type: 杂志文章,评审


    authors: Edwards AN,McBride SM

    更新日期:2014-09-01 00:00:00