Halomonas neptunia sp. nov., Halomonas sulfidaeris sp. nov., Halomonas axialensis sp. nov. and Halomonas hydrothermalis sp. nov.: halophilic bacteria isolated from deep-sea hydrothermal-vent environments

2004 ◽  
Vol 54 (2) ◽  
pp. 499-511 ◽  
Author(s):  
Jonathan Z. Kaye ◽  
M. Carmen Márquez ◽  
Antonio Ventosa ◽  
John A. Baross
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
Type Strain ◽  
Halophilic Bacteria ◽  
Rrna Gene ◽  
The Novel ◽  
South Pacific Ocean ◽  
Phenotypic Tests ◽  
North And South ◽  
Temperature Optima

To assess the physiological and phylogenetic diversity of culturable halophilic bacteria in deep-sea hydrothermal-vent environments, six isolates obtained from low-temperature hydrothermal fluids, sulfide rock and hydrothermal plumes in North and South Pacific Ocean vent fields located at 1530–2580 m depth were fully characterized. Three strains were isolated on media that contained oligotrophic concentrations of organic carbon (0·002 % yeast extract). Sequencing of the 16S rRNA gene indicated that all strains belonged to the genus Halomonas in the γ-subclass of the Proteobacteria. Consistent with previously described species, the novel strains were slightly to moderately halophilic and grew in media containing up to 22–27 % total salts. The isolates grew at temperatures as low as −1 to 2 °C and had temperature optima of 30 or 20–35 °C. Both the minimum and optimum temperatures for growth were similar to those of Antarctic and sea-ice Halomonas species and lower than typically observed for the genus as a whole. Phenotypic tests revealed that the isolates were physiologically versatile and tended to have more traits in common with each other than with closely related Halomonas species, presumably a reflection of their common deep-sea, hydrothermal-vent habitat of origin. The G+C content of the DNA for all strains was 56·0–57·6 mol%, and DNA–DNA hybridization experiments revealed that four strains (Eplume1T, Esulfide1T, Althf1T and Slthf2T) represented novel species and that two strains (Eplume2 and Slthf1) were related to Halomonas meridiana. The proposed new species names are Halomonas neptunia (type strain Eplume1T=ATCC BAA-805T=CECT 5815T=DSM 15720T), Halomonas sulfidaeris (type strain Esulfide1T=ATCC BAA-803T=CECT 5817T=DSM 15722T), Halomonas axialensis (type strain Althf1T=ATCC BAA-802T=CECT 5812T=DSM 15723T) and Halomonas hydrothermalis (type strain Slthf2T=ATCC BAA-800T=CECT 5814T=DSM 15725T).

scholarly journals Sulfurimonas paralvinellae sp. nov., a novel mesophilic, hydrogen- and sulfur-oxidizing chemolithoautotroph within the Epsilonproteobacteria isolated from a deep-sea hydrothermal vent polychaete nest, reclassification of Thiomicrospira denitrificans as Sulfurimonas denitrificans comb. nov. and emended description of the genus Sulfurimonas

2006 ◽  
Vol 56 (8) ◽  
pp. 1725-1733 ◽  
Author(s):  
Ken Takai ◽  
Masae Suzuki ◽  
Satoshi Nakagawa ◽  
Masayuki Miyazaki ◽  
Yohey Suzuki ◽  
...  
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
Type Strain ◽  
Elemental Sulfur ◽  
Okinawa Trough ◽  
Rrna Gene ◽  
Sulfur Source ◽  
The Novel ◽  
Emended Description ◽  
Thiomicrospira Denitrificans

A novel mesophilic bacterium, strain GO25T, was isolated from a nest of hydrothermal vent polychaetes, Paralvinella sp., at the Iheya North field in the Mid-Okinawa Trough. Cells were motile short rods with a single polar flagellum. Growth was observed between 4 and 35 °C (optimum 30 °C; 13–16 h doubling time) and between pH 5.4 and 8.6 (optimum pH 6.1). The isolate was a facultatively anaerobic chemolithoautotroph capable of growth using molecular hydrogen, elemental sulfur or thiosulfate as the sole energy source, carbon dioxide as the sole carbon source, ammonium or nitrate as the sole nitrogen source and elemental sulfur, thiosulfate or yeast extract as the sole sulfur source. Strain GO25T represents the first deep-sea epsilonproteobacterium capable of growth by both hydrogen and sulfur oxidation. Nitrate or molecular oxygen (up to 10 % partial pressure) could serve as the sole electron acceptor to support growth. Metabolic products of nitrate reduction shifted in response to the electron donor provided. The G+C content of genomic DNA was 37.6 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the novel isolate belonged to the genus Sulfurimonas and was most closely related to Sulfurimonas autotrophica OK10T (96.3 % sequence similarity). DNA–DNA hybridization demonstrated that the novel isolate could be differentiated genotypically from Sulfurimonas autotrophica OK10T. On the basis of the physiological and molecular properties of the novel isolate, the name Sulfurimonas paralvinellae sp. nov. is proposed, with strain GO25T (=JCM 13212T=DSM 17229T) as the type strain. Thiomicrospira denitrificans DSM 1251T (=ATCC 33889T) is phylogenetically associated with Sulfurimonas autotrophica OK10T and Sulfurimonas paralvinellae GO25T. Based on the phylogenetic relationship between Thiomicrospira denitrificans DSM 1251T, Sulfurimonas autotrophica OK10T and Sulfurimonas paralvinellae GO25T, we propose the reclassification of Thiomicrospira denitrificans as Sulfurimonas denitrificans comb. nov. (type strain DSM 1251T=ATCC 33889T). In addition, an emended description of the genus Sulfurimonas is proposed.

scholarly journals Hippea jasoniae sp. nov. and Hippea alviniae sp. nov., thermoacidophilic members of the class Deltaproteobacteria isolated from deep-sea hydrothermal vent deposits

2012 ◽  
Vol 62 (Pt_6) ◽  
pp. 1252-1258 ◽  
Author(s):  
Gilberto E. Flores ◽  
Ryan C. Hunter ◽  
Yitai Liu ◽  
Anchelique Mets ◽  
Stefan Schouten ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
16S Rrna ◽  
16S Rrna Gene ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Type Strain ◽  
Type Species ◽  
Rrna Gene ◽  
Content Type ◽  
Link Type

Thirteen novel, obligately anaerobic, thermoacidophilic bacteria were isolated from deep-sea hydrothermal vent sites. Four of the strains, designated EP5-rT, KM1, Mar08-272rT and Mar08-368r, were selected for metabolic and physiological characterization. With the exception of strain EP5-rT, all strains were short rods that grew between 40 and 72 °C, with optimal growth at 60–65 °C. Strain EP5-rT was more ovoid in shape and grew between 45 and 75 °C, with optimum growth at 60 °C. The pH range for growth of all the isolates was between pH 3.5 and 5.5 (optimum pH 4.5 to 5.0). Strain Mar08-272rT could only grow up to pH 5.0. Elemental sulfur was required for heterotrophic growth on acetate, succinate, Casamino acids and yeast extract. Strains EP5-rT, Mar08-272rT and Mar08-368r could also use fumarate, while strains EP5-rT, KM1 and Mar08-272rT could also use propionate. All isolates were able to grow chemolithotrophically on H2, CO2, sulfur and vitamins. Phylogenetic analysis of 16S rRNA gene sequences placed all isolates within the family Desulfurellaceae of the class Deltaproteobacteria , with the closest cultured relative being Hippea maritima MH2 T (~95–98 % gene sequence similarity). Phylogenetic analysis also identified several isolates with at least one intervening sequence within the 16S rRNA gene. The genomic DNA G+C contents of strains EP5-rT, KM1, Mar08-272rT and Mar08-368r were 37.1, 42.0, 35.6 and 37.9 mol%, respectively. The new isolates differed most significantly from H. maritima MH2 T in their phylogenetic placement and in that they were obligate thermoacidophiles. Based on these phylogenetic and phenotypic properties, the following two novel species are proposed: Hippea jasoniae sp. nov. (type strain Mar08-272rT = DSM 24585T = OCM 985T) and Hippea alviniae sp. nov. (type strain EP5-rT = DSM 24586T = OCM 986T).

scholarly journals Sulfurovum aggregans sp. nov., a hydrogen-oxidizing, thiosulfate-reducing chemolithoautotroph within the Epsilonproteobacteria isolated from a deep-sea hydrothermal vent chimney, and an emended description of the genus Sulfurovum

2014 ◽  
Vol 64 (Pt_9) ◽  
pp. 3195-3201 ◽  
Author(s):  
Sayaka Mino ◽  
Hideaki Kudo ◽  
Takayuki Arai ◽  
Tomoo Sawabe ◽  
Ken Takai ◽  
...  
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
Type Species ◽  
Rrna Gene ◽  
Strictly Anaerobic ◽  
The Novel ◽  
Central Indian Ridge ◽  
Content Type ◽  
Link Type ◽  
Emended Description

A novel mesophilic, strictly hydrogen-oxidizing, sulfur-, nitrate- and thiosulfate-reducing bacterium, designated strain Monchim33T, was isolated from a deep-sea hydrothermal vent chimney at the Central Indian Ridge. The non-motile, rod-shaped cells were Gram-stain-negative and non-sporulating. Growth was observed between 15 and 37 °C (optimum 33 °C; 3.2 h doubling time) and between pH 5.4 and 8.6 (optimum pH 6.0). The isolate was a strictly anaerobic chemolithoautotroph capable of using molecular hydrogen as the sole energy source and carbon dioxide as the sole carbon source. The G+C content of the genomic DNA was 42.6 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the novel isolate belonged to the genus Sulfurovum and was closely related to Sulfurovum sp. NBC37-1 and Sulfurovum lithotrophicum 42BKT (95.6 and 95.4 % similarity, respectively). DNA–DNA hybridization demonstrated that the novel isolate could be differentiated genotypically from Sulfurovum sp. NBC37-1 and Sulfurovum lithotrophicum . On the basis of the molecular and physiological traits of the new isolate, the name Sulfurovum aggregans sp. nov. is proposed, with the type strain Monchim33T ( = JCM 19824T = DSM 27205T).

scholarly journals Mycobacterium europaeum sp. nov., a scotochromogenic species related to the Mycobacterium simiae complex

2011 ◽  
Vol 61 (7) ◽  
pp. 1606-1611 ◽  
Author(s):  
Enrico Tortoli ◽  
Erik C. Böttger ◽  
Anna Fabio ◽  
Enevold Falsen ◽  
Zoe Gitti ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Type Strain ◽  
Novel Species ◽  
Rrna Gene ◽  
The Novel ◽  
Gene Sequences ◽  
16S Rrna Gene Sequences ◽  
Polyphasic Analysis ◽  
Mycobacterium Simiae

Four strains isolated in the last 15 years were revealed to be identical in their 16S rRNA gene sequences to MCRO19, the sequence of which was deposited in GenBank in 1995. In a polyphasic analysis including phenotypic and genotypic features, the five strains (including MCRO19), which had been isolated in four European countries, turned out to represent a unique taxonomic entity. They are scotochromogenic slow growers and are genetically related to the group that included Mycobacterium simiae and 15 other species. The novel species Mycobacterium europaeum sp. nov. is proposed to accommodate these five strains. Strain FI-95228T ( = DSM 45397T  = CCUG 58464T) was chosen as the type strain. In addition, a thorough revision of the phenotypic and genotypic characters of the species related to M. simiae was conducted which leads us to suggest the denomination of the ‘Mycobacterium simiae complex’ for this group.

scholarly journals Nine novel psychrotolerant species of the genus Pedobacter isolated from Arctic soil with potential antioxidant activities

2020 ◽  
Vol 70 (4) ◽  
pp. 2537-2553 ◽  
Author(s):  
Ram Hari Dahal ◽  
Dhiraj Kumar Chaudhary ◽  
Dong-Uk Kim ◽  
Jaisoo Kim
Keyword(s):  
Type Strain ◽  
Antioxidant Activities ◽  
Rrna Gene ◽  
Major Polar Lipid ◽  
Strictly Aerobic ◽  
The Novel ◽  
Content Type ◽  
Link Type ◽  
Arctic Soil ◽  
Type Strains

Fifteen isolates of the genus Pedobacter were obtained from Arctic soil samples. All isolates were Gram-stain-negative and rod-shaped. Cells were strictly aerobic, psychrotolerant and grew optimally at 15–20 °C. Phylogenetic analysis based on 16S rRNA gene sequences revealed that all the isolated strains formed a lineage within the family Sphingobacteriaceae and clustered as members of the genus Pedobacter . The sole respiratory quinone was MK-7 and the major polar lipid was phosphatidylethanolamine. The major cellular fatty acids were summed feature 3 (iso-C15 : 02-OH/C16 : 1ω7c/ω6c), iso-C15 : 0 and iso-C17 : 0 3-OH. The DNA G+C content of the novel strains was 33.9–41.8 mol%. In addition, the average nucleotide identity and in silico DNA–DNA hybridization relatedness values between the novel type strains and phylogenetically related type strains were below the threshold values used for species delineation. Based on genomic, chemotaxonomic, phenotypic, phylogenetic and phylogenomic analyses, the isolated strains represent novel species in the genus Pedobacter , for which the names Pedobacter cryotolerans sp. nov. (type strain AR-2-6T=KEMB 9005-717T=KACC 19998T=NBRC 113826T), Pedobacter cryophilus sp. nov. (type strain AR-3-17T=KEMB 9005-718T=KACC 19999T=NBRC 113827T), Pedobacter frigiditerrae sp. nov. (type strain RP-1-13T=KEMB 9005-720T=KACC 21147T=NBRC 113829T), Pedobacter psychroterrae sp. nov. (type strain RP-1-14T=KEMB 9005-721T=KACC 21148T=NBRC 113830T), Pedobacter hiemivivus sp. nov. (type strain RP-3-8T=KEMB 9005-724T=KACC 21152T=NBRC 113833T), Pedobacter frigidisoli sp. nov. (type strain RP-3-11T=KEMB 9005-725T=KACC 21153T=NBRC 113927T), Pedobacter frigoris sp. nov. (type strain RP-3-15T=KEMB 9005-726T=KACC 21154T=NBRC 113834T), Pedobacter psychrodurus sp. nov. (type strain RP-3-21T=KEMB 9005-728T=KACC 21156T=NBRC 113835T) and Pedobacter polaris sp. nov. (type strain RP-3-22T=KEMB 9005-729T=KACC 21157T=NBRC 113836T) are proposed.

scholarly journals Candida aechmeae sp. nov. and Candida vrieseae sp. nov., novel yeast species isolated from the phylloplane of bromeliads in Southern Brazil

2010 ◽  
Vol 60 (1) ◽  
pp. 244-248 ◽  
Author(s):  
Melissa Fontes Landell ◽  
Raisa Billodre ◽  
Jesus P. Ramos ◽  
Orílio Leoncini ◽  
Marilene H. Vainstein ◽  
...  
Keyword(s):  
Type Strain ◽  
Yeast Species ◽  
Novel Species ◽  
Sequence Divergence ◽  
Rrna Gene ◽  
The Novel ◽  
D2 Domain ◽  
Its Gene ◽  
Ascomycetous Yeasts ◽  
Positive Results

Two novel yeast species, Candida aechmeae sp. nov. and Candida vrieseae sp. nov., were isolated from bromeliads in Itapuã Park, Rio Grande do Sul, Brazil. These species are genetically isolated from all other currently recognized ascomycetous yeasts based on their sequence divergence in the D1/D2 domain of the LSU rRNA gene. C. aechmeae sp. nov. is phylogenetically close to Candida ubatubensis, a species also isolated from bromeliads in Brazil, but the novel species can be differentiated on the basis of differences in the D1/D2 domain and positive results for the assimilation of l-arabinose, raffinose, inulin and citrate. Candida vrieseae sp. nov. is phylogenetically placed in a clade near Candida membranifaciens that is composed of several species associated with insects, but the novel species can be differentiated from them by the D1/D2 and ITS gene sequences, positive results for the assimilation of nitrite and a negative result for the assimilation of ethylamine. The type strain for Candida aechmeae sp. nov. is BI153T (=CBS 10831T=NRRL Y-48456T) and the type strain for C. vrieseae sp. nov. is BI146T (=CBS 10829T=NRRL Y-48461T).

scholarly journals Ogataea mangiferae sp. nov., a methylotrophic yeast isolated from mango leaves

2015 ◽  
Vol 65 (Pt_6) ◽  
pp. 1855-1859 ◽  
Author(s):  
Ana Raquel O. Santos ◽  
Elisa S. Faria ◽  
Marc-André Lachance ◽  
Carlos A. Rosa
Keyword(s):  
Type Strain ◽  
Yeast Species ◽  
Novel Species ◽  
Mangifera Indica ◽  
Large Subunit ◽  
Its Region ◽  
Methylotrophic Yeast ◽  
Rrna Gene ◽  
The Novel ◽  
Mango Leaves

Five strains of a novel methanol-assimilating yeast species were isolated from mango (Mangifera indica) leaves collected at the campus of the Federal University of Minas Gerais in Brazil. The sequences of the internal transcribed spacer (ITS) region and the D1/D2 domains of the large subunit of the rRNA gene showed that this species belongs to the Ogataea clade and is related to O. allantospora, O. chonburiensis, O. dorogensis, O. kodamae, O. paradorogensis and Candida xyloterini (Ogataea clade). The novel species differs in the D1/D2 domains of the large subunit of the rRNA gene by 12 to 40 substitutions from these Ogataea species. The name Ogataea mangiferae sp. nov. is proposed for this novel species. The type strain of Ogataea mangiferae sp. nov. is UFMG-CM-Y253T ( = CBS 13492T). The Mycobank number is MB 811646.

Usitatibacter rugosus gen. nov., sp. nov. and Usitatibacter palustris sp. nov., novel members of Usitatibacteraceae fam. nov. within the order Nitrosomonadales isolated from soil

2021 ◽  
Author(s):  
Selma Vieira ◽  
Katharina J. Huber ◽  
Meina Neumann-Schaal ◽  
Alicia Geppert ◽  
Manja Luckner ◽  
...  
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Type Strain ◽  
Type Species ◽  
Sequence Similarity ◽  
Rrna Gene ◽  
The Novel ◽  
Content Type ◽  
Link Type ◽  
Wide Range

Members of the metabolically diverse order Nitrosomonadales inhabit a wide range of environments. Two strains affiliated with this order were isolated from soils in Germany and characterized by a polyphasic approach. Cells of strains 0125_3T and Swamp67T are Gram-negative rods, non-motile, non-spore-forming, non-capsulated and divide by binary fission. They tested catalase-negative, but positive for cytochrome c-oxidase. Both strains form small white colonies on agar plates and grow aerobically and chemoorganotrophically on SSE/HD 1 : 10 medium, preferably utilizing organic acids and proteinaceous substrates. Strains 0125_3T and Swamp67T are mesophilic and grow optimally without NaCl addition at slightly alkaline conditions. Major fatty acids are C16 : 1  ω7c, C16 : 0 and C14 : 0. The major polar lipids are diphosphatidylglycerol, phosphatidylethanolamine and phosphatidyglycerol. The predominant respiratory quinone is Q-8. The G+C content for 0125_3T and Swamp67T was 67 and 66.1 %, respectively. The 16S rRNA gene analysis indicated that the closest relatives (<91 % sequence similarity) of strain 0125_3T were Nitrosospira multiformis ATCC 25196T, Methyloversatilis universalis FAM5T and Denitratisoma oestradiolicum AcBE2-1T, while Nitrosospira multiformis ATCC 25196T, Nitrosospira tenuis Nv1T and Nitrosospira lacus APG3T were closest to strain Swamp67T. The two novel strains shared 97.4 % 16S rRNA gene sequence similarity with one another and show low average nucleotide identity of their genomes (83.8 %). Based on the phenotypic, chemotaxonomic, genomic and phylogenetic analysis, we propose the two novel species Usitatibacter rugosus sp. nov (type strain 0125_3T=DSM 104443T=LMG 29998T=CECT 9241T) and Usitatibacter palustris sp. nov. (type strain Swamp67T=DSM 104440T=LMG 29997T=CECT 9242T) of the novel genus Usitatibacter gen. nov., within the novel family Usitatibacteraceae fam. nov.

scholarly journals Amphibacillus sediminis sp. nov., an endospore-forming bacterium isolated from lake sediment in Japan

2007 ◽  
Vol 57 (11) ◽  
pp. 2489-2492 ◽  
Author(s):  
Sun-Young An ◽  
Shu Ishikawa ◽  
Hiroaki Kasai ◽  
Keiichi Goto ◽  
Akira Yokota
Keyword(s):  
Lake Sediment ◽  
Type Strain ◽  
Diaminopimelic Acid ◽  
Phylogenetic Position ◽  
Rrna Gene ◽  
The Novel ◽  
Phenotypic Properties ◽  
Diamino Acid ◽  
Isoprenoid Quinones ◽  
Type Strains

A facultatively anaerobic, moderately alkaliphilic, Gram-positive, spore-forming and rod-shaped bacterial strain, Shu-P-Ggiii25-2T, was isolated from lake sediment in Shizuoka, Japan, and was characterized taxonomically using a polyphasic approach. Analysis of the 16S rRNA gene sequence indicated that the novel isolate clustered with the type strain of Amphibacillus xylanus and it exhibited sequence similarities of 94.9–95.6 % to the type strains of species of the genus Amphibacillus. Isoprenoid quinones and oxidase and catalase activities were not detected for strain Shu-P-Ggiii25-2T. The DNA G+C content was 42.3 mol%, the cell-wall peptidoglycan contained meso-diaminopimelic acid as the diagnostic diamino acid and the major cellular fatty acids were iso-C14 : 0, iso-C15 : 0, anteiso-C15 : 0, C16 : 0 and iso-C16 : 0. On the basis of phylogenetic position and phenotypic properties, strain Shu-P-Ggiii25-2T represents a novel species of the genus Amphibacillus, for which the name Amphibacillus sediminis sp. nov. is proposed. The type strain is Shu-P-Ggiii25-2T (=MBIC08269T=IAM 15428T=KCTC 13120T). An emended description of the genus Amphibacillus is also given.

scholarly journals Nautilia nitratireducens sp. nov., a thermophilic, anaerobic, chemosynthetic, nitrate-ammonifying bacterium isolated from a deep-sea hydrothermal vent

2010 ◽  
Vol 60 (5) ◽  
pp. 1182-1186 ◽  
Author(s):  
Ileana Pérez-Rodríguez ◽  
Jessica Ricci ◽  
James W. Voordeckers ◽  
Valentin Starovoytov ◽  
Costantino Vetriani
Keyword(s):  
Gas Phase ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Gene Sequence ◽  
Novel Species ◽  
Rrna Gene ◽  
East Pacific ◽  
Optimum Ph ◽  
Casamino Acids ◽  
The 16S Rrna Gene

A thermophilic, anaerobic, chemosynthetic bacterium, designated strain MB-1T, was isolated from the walls of an active deep-sea hydrothermal vent chimney on the East Pacific Rise at  ° 50′ N 10 ° 17′ W. The cells were Gram-negative-staining rods, approximately 1–1.5 μm long and 0.3–0.5 μm wide. Strain MB-1T grew at 25–65 °C (optimum 55 °C), with 10–35 g NaCl l−1 (optimum 20 g l−1) and at pH 4.5–8.5 (optimum pH 7.0). Generation time under optimal conditions was 45.6 min. Growth occurred under chemolithoautotrophic conditions with H2 as the energy source and CO2 as the carbon source. Nitrate was used as the electron acceptor, with resulting production of ammonium. Thiosulfate, sulfur and selenate were also used as electron acceptors. No growth was observed in the presence of lactate, peptone or tryptone. Chemo-organotrophic growth occurred in the presence of acetate, formate, Casamino acids, sucrose, galactose and yeast extract under a N2/CO2 gas phase. The G+C content of the genomic DNA was 36.0 mol%. Phylogenetic analysis of the 16S rRNA gene sequence indicated that this organism is closely related to Nautilia profundicola AmHT, Nautilia abyssi PH1209T and Nautilia lithotrophica 525T (95, 94 and 93 % sequence identity, respectively). On the basis of phylogenetic, physiological and genetic considerations, it is proposed that the organism represents a novel species within the genus Nautilia, Nautilia nitratireducens sp. nov. The type strain is MB-1T (=DSM 22087T =JCM 15746T).

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