Description of Azospira restricta sp. nov., a nitrogen-fixing bacterium isolated from groundwater

Bae, Hee‐Sung; Rash, Brian A.; Rainey, Fred A.; Nobre, M. Fernanda; Tiago, Igor; Costa, Milton S. da; Moe, William M.

doi:10.1099/ijs.0.64965-0

Cited by 71 publications

(37 citation statements)

References 13 publications

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“…These Gram-negative β-Proteobacteria are non-spore-forming with a polar flagellum . Currently, there are three described species of Azospira and a number of strains for Azospira oryzae [56], [57], [58]. This genus is of interest due to its potential for use in bioremediation.…”

Section: Resultsmentioning

confidence: 99%

Impacts of Poultry House Environment on Poultry Litter Bacterial Community Composition

Dumas

Polson

Ritter³

et al. 2011

PLoS ONE

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Viral and bacterial pathogens are a significant economic concern to the US broiler industry and the ecological epicenter for poultry pathogens is the mixture of bedding material, chicken excrement and feathers that comprises the litter of a poultry house. This study used high-throughput sequencing to assess the richness and diversity of poultry litter bacterial communities, and to look for connections between these communities and the environmental characteristics of a poultry house including its history of gangrenous dermatitis (GD). Cluster analysis of 16S rRNA gene sequences revealed differences in the distribution of bacterial phylotypes between Wet and Dry litter samples and between houses. Wet litter contained greater diversity with 90% of total bacterial abundance occurring within the top 214 OTU clusters. In contrast, only 50 clusters accounted for 90% of Dry litter bacterial abundance. The sixth largest OTU cluster across all samples classified as an Arcobacter sp., an emerging human pathogen, occurring in only the Wet litter samples of a house with a modern evaporative cooling system. Ironically, the primary pathogenic clostridial and staphylococcal species associated with GD were not found in any house; however, there were thirteen 16S rRNA gene phylotypes of mostly Gram-positive phyla that were unique to GD-affected houses and primarily occurred in Wet litter samples. Overall, the poultry house environment appeared to substantially impact the composition of litter bacterial communities and may play a key role in the emergence of food-borne pathogens.

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Section: Resultsmentioning

confidence: 99%

Impacts of Poultry House Environment on Poultry Litter Bacterial Community Composition

Dumas

Polson

Ritter³

et al. 2011

PLoS ONE

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“…Azospira restricta was originally isolated from groundwater, and it has been also known as an oligotroph capable of producing nutrient storage polymers including poly-beta-hydroxybutyrate (Bae et al 2007). It remains to be clarified which environmental factors select and shape the oligotrophic bacterial populations in the perturbed MBR.…”

Section: Discussionmentioning

confidence: 99%

Functional maintenance and structural flexibility of microbial communities perturbed by simulated intense rainfall in a pilot-scale membrane bioreactor

Sato

Hori

Navarro

et al. 2016

Appl Microbiol Biotechnol

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Intense rainfall is one of the most serious and common natural events, causing the excessive inflow of rainwater into wastewater treatment plants. However, little is known about the impacts of rainwater dilution on the structure and function of the sludge microorganisms. Here, high-throughput sequencing of 16S ribosomal RNA (rRNA) genes was implemented to describe the microbial community dynamics during the simulated intense rainfall situation (event i) in which approximately 45 % of the sludge biomass was artificially overflowed by massive water supply in a pilot-scale membrane bioreactor. Thereafter, we investigated the functional and structural responses of the perturbed microbial communities to subsequent conditional changes, i.e., an increase in organic loading rate from 225 to 450 mg chemical oxygen demand (COD) l(-1) day(-1) (event ii) and an addition of a microbiota activator (event iii). Due to the event i, the COD removal declined to 78.2 %. This deterioration coincided with the decreased microbial diversity and the proliferation of the oligotrophic Aquabacterium sp. During the succeeding events ii and iii, the sludge biomass increased and the COD removal became higher (86.5-97.4 %). With the apparent recovery of the reactor performance, microbial communities became diversified and the compositions dynamically changed. Notably, various bacterial micropredators were highly enriched under the successive conditions, most likely being involved in the flexible reorganization of microbial communities. These results indicate that the activated sludge harbored functionally redundant microorganisms that were able to thrive and proliferate along with the conditional changes, thereby contributing to the functional maintenance of the membrane bioreactor.

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“…1,2 A nitrate concentration of lower than 10 mg L À1 is designated by the US Environmental Protection Agency and 50 mg L À1 by the World Health Organization and European Economic Community to prevent the risks to human health. 3 Therefore, the social and environmental concerns have led the development of strategies to reduce nitrate concentration.…”

Section: Introductionmentioning

confidence: 99%

Slowly released carbon source from composite materials system for removing nitrate pollution in groundwater

et al. 2017

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Description of Azospira restricta sp. nov., a nitrogen-fixing bacterium isolated from groundwater

Cited by 71 publications

References 13 publications

Impacts of Poultry House Environment on Poultry Litter Bacterial Community Composition

Impacts of Poultry House Environment on Poultry Litter Bacterial Community Composition

Functional maintenance and structural flexibility of microbial communities perturbed by simulated intense rainfall in a pilot-scale membrane bioreactor

Slowly released carbon source from composite materials system for removing nitrate pollution in groundwater

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