Oceanirhabdus sediminicola gen. nov., sp. nov., an anaerobic bacterium isolated from sea sediment

Pi, Ruoxi; Zhang, Wenwu; Fang, Mingxu; Zhang, Yanzhou; Li, Tiantian; Wu, Min; Zhu, Xuemei

doi:10.1099/ijs.0.051243-0

Cited by 14 publications

(1 citation statement)

References 27 publications

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“…presence in the medium(Crapart et al 2007, Pi et al 2013, Slobodkin et al 2003. The lack of electron acceptors in the test medium other than sulfate encourages fermentative growth and the extensive fermentation might produce organic acid that reduces the pH sufficiently to promote MIC (Gu and Galicia 2012, Salgar-Chaparro et al 2020…”

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confidence: 99%

Molecular ecology and physiology of microbiologically-influenced corrosion in the deep sea

Yeo

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Corrosion poses a significant challenge to deep-sea operations, given the harsh and remote conditions of this environment. Mild steels, widely utilized for their affordability and favorable mechanical properties in marine applications, have not been extensively studied regarding microbiologically-influenced corrosion (MIC) in the deep sea. By employing hydrostatic pressure vessels and pump to replicate deepsea conditions, the MIC of the marine-grade mild steel AH36 was investigated. Here, it was found that the hydrostatic pressure may influence the severity of the MIC induced by shallow-water and deep-sea sulfate-reducing bacteria (SRB). Further comparative proteomic analysis of the selected deep-sea SRB P. piezophilus indicates that differential enrichment of proteins associated with the energy metabolism pathway when incubated with mild steel. Interestingly, elevated hydrostatic pressures do not significantly alter the total proteome of deep-sea SRB, suggesting that changes in MIC behaviors may be linked to protein activity rather than the abundance of specific proteins. To validate the deep-sea MIC, enrichment cultures from field samples collected from deep sea at a depth of 1988 m. The enrichment culture established from a corroding mooring chain exhibits aggressive MIC, causing localized corrosion attacks primarily at the edges of mild steel coupons. This corrosive microbial community comprises SRB and elemental sulfur metabolizing bacteria, hinting at a potential role of elemental sulfur in mediating deep-sea MIC. Overall, this dissertation underscores the persistent threat of MIC to mild steels, even in the extreme conditions of the deep sea. While exact mechanism remains unclear, the findings here suggest that enhanced MIC is associated with stimulating anodic reaction

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Molecular ecology and physiology of microbiologically-influenced corrosion in the deep sea

Yeo

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Oceanirhabdus

Pi¹,

Zhu²

2020

Bergey's Manual of Systematics of Archaea and Bacteria

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Oceanirhabdus (O.ce.a.ni.rhab'dus. L. masc. n. oceanus ocean; Gr. fem. n. rhabdos rod; N.L. fem. n. Oceanirhabdus a rod of the ocean). Firmicutes / Clostridia / Clostridiales / Clostridiaceae / Oceanirhabdus Cells are rod‐shaped with peritrichous flagella. Endospores form during stationary phase of growth. Cells are Gram‐positive staining. Colonies are circular, white, semitransparent with a smooth surface. Obligate anaerobes. Optimal growth at pH 6.5–7.0, 34–38°C, and 2.5% (w/v) NaCl. Cells can utilize multiple types of complex proteinaceous substrates as carbon and energy sources. The predominant cellular fatty acids are anteiso‐C 15:0 , C 16:0 , iso‐C 15:0 , anteiso‐C 17:0 , and C 16:0 DMA. No isoprenoid quinone is detected. Oceanirhabdus is in the class Clostridia , the order Clostridiales , and the family Clostridiaceae . The genus Oceanirhabdus comprises one species, Oceanirhabdus sediminicola . The type strain of the type species of the genus was isolated from marine sediments. Phylogenetic analysis of 16S rRNA genes indicates that Oceanirhabdus is a lineage that is separated from the closely related genera in the family Clostridiaceae . DNA G + C content (mol%) : 35.8 (HPLC). Type species : Oceanirhabdus sediminicola Pi et al. 2013 VP .

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H aloimpatiens

Fang¹,

Zhu²

2019

Bergey's Manual of Systematics of Archaea and Bacteria

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Ha.lo.im.pa'ti.ens. Gr. n. hals , halos salt; L. adj. impatiens intolerant; N.L. masc. n. Haloimpatiens salt‐intolerant. Firmicutes / Clostridia / Clostridiales / Clostridiaceae / Haloimpatiens Haloimpatiens is a genus in the family Clostridiaceae . The genus currently has only one validated species, Haloimpatiens lingqiaonensis . The cells of H . lingqiaonensis are chemoorganotrophic rods that can ferment only on complex proteinaceous compounds. This strictly anaerobic bacterium can grow in mildly thermophilic (up to 48°C) and neutral pH conditions. The cells do not require NaCl for growth. No isoprenoid quinone is detected. The main fatty acids are C 14 :0 and C 16 :0 . The major polar lipids are diphosphatidylglycerol, phosphatidylglycerol, several phospholipids, and glycolipids. Although the only species was isolated from paper mill waste water, phylogenetically related environmental sequences revealed that the potential members in the genus Haloimpatiens can also be found in soils and feces. DNA G + C content ( mol %): 30.0 (HPLC). Type species : Haloimpatiens lingqiaonensis Wu, Zhang, Sun, Zhang, Han, Pan et al., 2016, 631 VP .

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Oceanirhabdus sediminicola gen. nov., sp. nov., an anaerobic bacterium isolated from sea sediment

Cited by 14 publications

References 27 publications

Molecular ecology and physiology of microbiologically-influenced corrosion in the deep sea

Molecular ecology and physiology of microbiologically-influenced corrosion in the deep sea

Oceanirhabdus

H aloimpatiens

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