<i>Achromobacter</i>

Busse, Hans‐Jürgen; Auling, Georg

doi:10.1002/9781118960608.gbm00926

Cited by 8 publications

(4 citation statements)

References 56 publications

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“…As can be seen in the comparison between attached and planktonic communities in LB1 and LB2, the growth of aerobic species such as Achromobacter sp. ( Busse and Auling, 2015 ) and Delftia sp. ( Sly et al, 2015 ) in LB2 was the main discriminant between the two cells ( Figure 5 , Block 1), confirming the impact of oxygen in shaping the community structure.…”

Section: Resultsmentioning

confidence: 99%

Propionate Production by Bioelectrochemically-Assisted Lactate Fermentation and Simultaneous CO2 Recycling

et al. 2020

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Production of volatile fatty acids (VFAs), fundamental building blocks for the chemical industry, depends on fossil fuels but organic waste is an emerging alternative substrate. Lactate produced from sugar-containing waste streams can be further processed to VFAs. In this study, electrofermentation (EF) in a two-chamber cell is proposed to enhance propionate production via lactate fermentation. At an initial pH of 5, an applied potential of −1 V vs. Ag/AgCl favored propionate production over butyrate from 20 mM lactate (with respect to non-electrochemical control incubations), due to the pH buffering effect of the cathode electrode, with production rates up to 5.9 mM d–1 (0.44 g L–1 d–1). Microbial community analysis confirmed the enrichment of propionate-producing microorganisms, such as Tyzzerella sp. and Propionibacterium sp. Organisms commonly found in microbial electrosynthesis reactors, such as Desulfovibrio sp. and Acetobacterium sp., were also abundant at the cathode, indicating their involvement in recycling CO2 produced by lactate fermentation into acetate, as confirmed by stoichiometric calculations. Propionate was the main product of lactate fermentation at substrate concentrations up to 150 mM, with a highest production rate of 12.9 mM d–1 (0.96 g L–1 d–1) and a yield of 0.48 mol mol–1 lactate consumed. Furthermore, as high as 81% of the lactate consumed (in terms of carbon) was recovered as soluble product, highlighting the potential for EF application with high-carbon waste streams, such as cheese whey or other food wastes. In summary, EF can be applied to control lactate fermentation toward propionate production and to recycle the resulting CO2 into acetate, increasing the VFA yield and avoiding carbon emissions and addition of chemicals for pH control.

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Section: Resultsmentioning

confidence: 99%

Propionate Production by Bioelectrochemically-Assisted Lactate Fermentation and Simultaneous CO2 Recycling

et al. 2020

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“…First, the biological safety of the biocatalysts should be confirmed before considering their large-scale applications. Some A. xylosoxidans and M. mageritense strains are known to be opportunistic pathogens ( Busse and Auling, 2015 ; Magee and Ward, 2015 ), however, it is less likely that the isolates are pathogenic, as they originated from non-host environments and no obvious gene for pathogenesis (such as pathogenic islands) was found in their genomes. Yet, to be on the safe side, further screening of nonpathogenic halotolerant HOB might be helpful.…”

Section: Discussionmentioning

confidence: 99%

Enrichment of halotolerant hydrogen-oxidizing bacteria and production of high-value-added chemical hydroxyectoine using a hybrid biological–inorganic system

Feng,

Kazama,

et al. 2023

Front. Microbiol.

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Hybrid biological–inorganic (HBI) systems show great promise as CO2 conversion platforms combining CO2 fixation by hydrogen-oxidizing bacteria (HOB) with water splitting. Herein, halotolerant HOB were enriched using an HBI system with a high-ionic-strength medium containing 180 mM phosphate buffer to identify new biocatalysts. The reactors were inoculated with samples from saline environments and applied with a voltage of 2.0 V. Once an increase in biomass was observed with CO2 consumption, an aliquot of the medium was transferred to a new reactor. After two successive subcultures, Achromobacter xylosoxidans strain H1_3_1 and Mycolicibacterium mageritense strain H4_3_1 were isolated from the reactor media. Genome sequencing indicated the presence of genes for aerobic hydrogen-oxidizing chemolithoautotrophy and synthesis of the compatible solute hydroxyectoine in both strains. Furthermore, both strains produced hydroxyectoine in the reactors under the high-ionic-strength condition, suggesting the potential for new HBI systems using halotolerant HOB to produce high-value-added chemicals.

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“…[ 10 ] The biochemical reactions for this Gram-negative bacillus revealed the results as follows: catalase-positive, oxidase-positive, motile, nonfermenting, indole-negative, triple sugar iron, agar-K/K (alkaline/alkaline) and urease-negative, DNase-negative bacterium. [ 11 ]…”

Section: Methodsmentioning

confidence: 99%

Clinicomicrobiological Profile of Infections by Achromobacter: An Emerging Nosocomial Pathogen in Indian Hospitals

Siddiqui,

Patel,

Ghoshal

et al. 2023

International Journal of Applied &Amp; Basic Medical Research

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Background: Achromobacter causes opportunistic nosocomial infections in immunocompromised patients with high mortality. It is underreported as it is often misidentified by conventional microbiological methods. Aims: The aim of the study is to access the clinicomicrobiological profile and antibiogram of Achromobacter spp. from clinical isolates. Materials and Methods: It is an observational study done from July 2020 to December 2021 in our hospital. All nonduplicate isolates of Achromobacter from blood and respiratory samples were initially identified with VITEK-2 GN card system and further confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Antibiogram and treatment outcomes were also studied. Results: Achromobacter spp. was isolated from 14 patients. Blood samples yielded most isolates (71.4%; n = 10) followed by tracheal aspirate and bronchoalveolar lavage fluid. Bacteremia followed by pneumonia was the most common clinical manifestation of Achromobacter infection. All the isolates were identified as A. xylosoxidans denitrificans and showed 100% susceptibility to minocycline and piperacillin-tazobactam. Diabetes mellitus and malignancy were the most common underlying condition in these patients. A favorable outcome was seen in 78.6% of the individuals with timely institution of antibiotics and proper diagnosis. Conclusion: Infections due to Achromobacter are on the rise in developing countries like India. Resistance to many classes of antimicrobials makes its treatment more challenging therefore it should always be guided by antibiograms. The present study highlights the significance of this rare bacterium in patients with malignancies in India and advocates greater vigilance toward appropriate identification of this organism.

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Achromobacter

Cited by 8 publications

References 56 publications

Propionate Production by Bioelectrochemically-Assisted Lactate Fermentation and Simultaneous CO2 Recycling

Propionate Production by Bioelectrochemically-Assisted Lactate Fermentation and Simultaneous CO2 Recycling

Enrichment of halotolerant hydrogen-oxidizing bacteria and production of high-value-added chemical hydroxyectoine using a hybrid biological–inorganic system

Clinicomicrobiological Profile of Infections by Achromobacter: An Emerging Nosocomial Pathogen in Indian Hospitals

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