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https://www.readbyqxmd.com/read/29924414/reduction-in-pseudomonas-aeruginosa-and-staphylococcus-aureus-biofilms-from-implant-materials-in-a-diffusion-dominated-environment
#1
James P Moley, Mary S McGrath, Jeffrey F Granger, Paul Stoodley, Devendra H Dusane
Antibiotic-loaded calcium sulfate beads (CS-B) are used to treat biofilm-related periprosthetic joint infections (PJI). A previous study has shown that such beads are effective in reducing lawns biofilms grown on agar plates; however, the ability of CS-B to eradicate biofilms grown on solid orthopaedic material surfaces has not been investigated. We grew biofilms of bioluminescent strains of Pseudomonas aeruginosa Xen41 and a USA300 MRSA Staphylococcus aureus SAP231 on ultra-high molecular weight polyethylene (PE), hydroxyapatite (HA), and 316L stainless steel (SS) coupons for three days under static growth conditions, with daily nutrient exchange...
June 20, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29910779/survival-and-energy-producing-strategies-of-alkane-degraders-under-extreme-conditions-and-their-biotechnological-potential
#2
REVIEW
Chulwoo Park, Woojun Park
Many petroleum-polluted areas are considered as extreme environments because of co-occurrence of low and high temperatures, high salt, and acidic and anaerobic conditions. Alkanes, which are major constituents of crude oils, can be degraded under extreme conditions, both aerobically and anaerobically by bacteria and archaea of different phyla. Alkane degraders possess exclusive metabolic pathways and survival strategies, which involve the use of protein and RNA chaperones, compatible solutes, biosurfactants, and exopolysaccharide production for self-protection during harsh environmental conditions such as oxidative and osmotic stress, and ionic nutrient-shortage...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29908747/mercury-in-soil-vegetable-and-human-hair-in-a-typical-mining-area-in-china-implication-for-human-exposure
#3
Qin Jia, Xuemei Zhu, Yaqiong Hao, Ziliang Yang, Qi Wang, Haihui Fu, Hongjin Yu
Concentrations of total mercury (T-Hg) and methylmercury (MeHg) in soil, vegetables, and human hair were measured in a mercury mining area in central China. T-Hg and MeHg concentrations in soil ranged from 1.53 to 1054.97mg/kg and 0.88 to 46.52μg/kg, respectively. T-Hg concentrations was correlated with total organic carbon (TOC) content (R2 =0.50, p<0.01) and pH values (R2 =0.21, p<0.05). A significant linear relationship was observed between MeHg concentrations and the abundance of sulfate-reducing bacteria (SRB) (R2 =0...
June 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29894929/anaerobic-biodegradation-of-pharmaceutical-compounds-new-insights-into-the-pharmaceutical-degrading-bacteria
#4
Mónica Martins, Sandra Sanches, Inês A C Pereira
Antibiotics and hormones are among the most concerning trace contaminants in the environment. Therefore, the present work aimed to identify anaerobic microorganisms with the ability to remove pharmaceutical products (PhPs) belonging to these two classes (ciprofloxacin, 17β-estradiol and sulfamethoxazole) under different anaerobic conditions, and to elucidate the bio-removal mechanisms involved. Ciprofloxacin was efficiently biodegraded under both nitrate- and sulfate-reducing conditions reaching a PhP removal superior to 80%, whereas 17β-estradiol was only biodegraded under nitrate-reducing conditions reaching a removal of 84%...
June 1, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29893726/sulfide-production-kinetics-and-model-of-stormwater-retention-ponds
#5
P M D'Aoust, F R Pick, R Wang, A Poulain, C Rennie, L Chen, C Kinsley, R Delatolla
Stormwater retention ponds can play a critical role in mitigating the detrimental effects of urbanization on receiving waters that result from increases in polluted runoff. However, the benthic oxygen demand of stormwater facilities may cause significant hypoxia and trigger the production of hydrogen sulfide (H2 S). This process is not well-documented and further research is needed to characterize benthic processes in stormwater retention ponds in order to improve their design and operation. In this study, sediment oxygen demand (SOD), sediment ammonia release (SAR) and sediment sulfide production (SSP) kinetics were characterized in situ and in the laboratory...
June 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29879664/use-of-coupled-wavelength-ultraviolet-light-emitting-diodes-for-inactivation-of-bacteria-in-subsea-oil-field-injection-water
#6
Yang Qiao, Daoyi Chen, Diya Wen
The development of subsea injection water disinfection systems will enable the novel exploration of offshore oilfields. Ultraviolet light emitting diodes (UV-LEDs) with peak wavelengths at 255 nm, 280 nm, 350 nm, and combinations of 255 nm and 350 nm, and 280 nm and 350 nm were investigated in this study to determine their efficiency at disinfecting saprophytic bacteria, iron bacteria, and sulfate reducing bacteria. Results show that UV-LEDs with peak wavelengths at 280 nm were the most practical in this domain because of their high performance in both energy-efficiency and reactivation suppression, although 255 nm UV-LEDs achieved an optimal germicidal effect in dose-based experiments...
June 4, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29877051/enhancement-of-methanogenesis-by-electric-syntrophy-with-biogenic-iron-sulfide-minerals
#7
Souichiro Kato, Kensuke Igarashi
Recent studies have shown that interspecies electron transfer between chemoheterotrophic bacteria and methanogenic archaea can be mediated by electric currents flowing through conductive iron oxides, a process termed electric syntrophy. In this study, we conducted enrichment experiments with methanogenic microbial communities from rice paddy soil in the presence of ferrihydrite and/or sulfate to determine whether electric syntrophy could be enabled by biogenic iron sulfides. Although supplementation with either ferrihydrite or sulfate alone suppressed methanogenesis, supplementation with both ferrihydrite and sulfate enhanced methanogenesis...
June 6, 2018: MicrobiologyOpen
https://www.readbyqxmd.com/read/29876374/data-set-on-the-bioprecipitation-of-sulfate-and-trivalent-arsenic-by-acidophilic-non-traditional-sulfur-reducing-bacteria
#8
Letícia Paiva de Matos, Patrícia Freitas Costa, Mariana Moreira, Paula Cristine Silva Gomes, Silvana de Queiroz Silva, Leandro Vinícius Alves Gurgel, Mônica Cristina Teixeira
Data presented here are related to the original paper "Simultaneous removal of sulfate and arsenic using immobilized non-traditional sulfate reducing bacteria (SRB) mixed culture and alternative low-cost carbon sources" published by same authors (Matos et al., 2018) [1]. The data set here presented aims to facilitate this paper comprehension by giving readers some additional information. Data set includes a brief description of experimental conditions and the results obtained during both batch and semi-continuous reactors experiments...
April 2018: Data in Brief
https://www.readbyqxmd.com/read/29875466/enhanced-carbon-sulfur-cycling-in-the-sediments-of-arabian-sea-oxygen-minimum-zone-center
#9
Svetlana Fernandes, Aninda Mazumdar, Sabyasachi Bhattacharya, Aditya Peketi, Tarunendu Mapder, Rimi Roy, Mary Ann Carvalho, Chayan Roy, P Mahalakshmi, Rheane Da Silva, P L Srinivasa Rao, Suman Kumar Banik, Wriddhiman Ghosh
Biogeochemistry of oxygen minimum zone (OMZ) sediments, which are characterized by high input of labile organic matter, have crucial bearings on the benthic biota, gas and metal fluxes across the sediment-water interface, and carbon-sulfur cycling. Here we couple pore-fluid chemistry and comprehensive microbial diversity data to reveal the sedimentary carbon-sulfur cycle across a water-depth transect covering the entire thickness of eastern Arabian Sea OMZ, off the west coast of India. Geochemical data show remarkable increase in average total organic carbon content and aerial sulfate reduction rate (JSO4 2- ) in the sediments of the OMZ center coupled with shallowing of sulfate methane transition zone and hydrogen sulfide and ammonium build-up...
June 6, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29873717/the-hunt-for-the-most-wanted-chemolithoautotrophic-spookmicrobes
#10
Michiel H In 't Zandt, Anniek Ee de Jong, Caroline P Slomp, Mike Sm Jetten
Microorganisms are the drivers of biogeochemical methane and nitrogen cycles. Essential roles of chemolithoautotrophic microorganisms in these cycles were predicted long before their identification. Dedicated enrichment procedures, metagenomics surveys and single-cell technologies have enabled the identification of several new groups of most-wanted spookmicrobes, including novel methoxydotrophic methanogens that produce methane from methylated coal compounds and acetoclastic 'Candidatus Methanothrix paradoxum', which is active in oxic soils...
June 1, 2018: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29867883/synergy-of-sodium-nitroprusside-and-nitrate-in-inhibiting-the-activity-of-sulfate-reducing-bacteria-in-oil-containing-bioreactors
#11
Tekle T Fida, Johanna Voordouw, Maryam Ataeian, Manuel Kleiner, Gloria Okpala, Jaspreet Mand, Gerrit Voordouw
Sodium nitroprusside (SNP) disrupts microbial biofilms through the release of nitric oxide (NO). The actions of SNP on bacteria have been mostly limited to the genera Pseudomonas , Clostridium , and Bacillus . There are no reports of its biocidal action on sulfate-reducing bacteria (SRB), which couple the reduction of sulfate to sulfide with the oxidation of organic electron donors. Here, we report the inhibition and kill of SRB by low SNP concentrations [0.05 mM (15 ppm)] depending on biomass concentration...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29862366/study-of-methanogenic-enrichment-cultures-of-rock-cores-from-the-deep-subsurface-of-the-iberian-pyritic-belt
#12
Tânia Leandro, Nuria Rodriguez, Patricia Rojas, Jose L Sanz, Milton S da Costa, Ricardo Amils
Two deep boreholes were drilled at 320 and 620 meters below surface in the Iberian Pyritic Belt (IPB) at Peña de Hierro (Huelva, Southwestern Spain). Cores were sampled and used for the establishment of enrichment cultures with methanogenic activity. The cultivable diversity of these enrichments was accessed using different cultivation techniques and several isolates were recovered in pure culture from various depths in both boreholes. Although no archaeal isolates were obtained in pure culture, strict anaerobes and facultative anaerobic bacteria belonging to the phyla Proteobacteria, Firmicutes , Actinobacteria and Bacteroidetes were isolated and identified using the 16S rRNA gene sequence...
April 2018: Heliyon
https://www.readbyqxmd.com/read/29861730/sulfate-reducing-bacteria-biofilm-formation-and-corrosive-activity-in-endodontic-files
#13
Fabiano Luiz Heggendorn, Aline Guerra Manssour Fraga, Dennis de Carvalho Ferreira, Lucio Souza Gonçalves, Viviane de Oliveira Freitas Lione, Márcia Teresa Soares Lutterbach
Aim: This study describes the biofilm formation and the corrosive capacity of sulfate-reducing bacteria (SRB) on the metallic structure of used endodontic files. Methods: Sulfate-reducing bacteria (SRB) ( Desulfovibrio desulfuricans oral and Desulfovibrio fairfieldensis or D. desulfuricans environmental) were inoculated into the culture media (Postgate C culture medium or modified Postgate E culture medium). The biocorrosive potential of these bacteria will be an important component of a biopharmaceutical under development called BACCOR...
2018: International Journal of Dentistry
https://www.readbyqxmd.com/read/29860532/influence-of-acidified-drinking-water-on-growth-performance-and-gastrointestinal-function-of-broilers
#14
H Hamid, H Q Shi, G Y Ma, Y Fan, W X Li, L H Zhao, J Y Zhang, C Ji, Q G Ma
The ban on the use of antibiotic feed additives as growth promoters compelled the researchers for exploring the future utility of other alternatives. This experiment was designed to evaluate the effect of acidified drinking water on growth performance, gastrointestinal pH, digestive enzymes, intestinal histomorphology, and cecum microbial counting of the broiler chicken. A total of 540 one-day-old male broilers (Arbor Acre) were randomly assigned to 5 treatments, with 6 replicates of 18 chicks per replicate...
June 1, 2018: Poultry Science
https://www.readbyqxmd.com/read/29860144/transcriptome-analysis-of-silver-palladium-and-selenium-stresses-in-pantoea-sp-imh
#15
Wenjing Liu, Yanan Wang, Chuanyong Jing
Heavy metal contamination is a significant environmental issue. Using bacteria for removal and reduction of heavy metals is an attractive alternative owing to its low-cost and eco-friendly properties. However, the mechanisms of resistance to and reduction of Ag(I), Pd(II), and Se(IV), especially in the same strain, remain unclear. Here, Pantoea sp. IMH was examed for its reduction of Ag(I), Pd(II), and Se(IV) to nanoparticles (NPs), and the molecular mechanism was investigated by transcriptome analysis. The results revealed that genes encoding binding, transport, catalytic activity, and metabolism were differentially expressed in cells exposed to Ag(I), Pd(II), and Se(IV)...
May 29, 2018: Chemosphere
https://www.readbyqxmd.com/read/29852063/impact-of-iron-enriched-aspergillus-oryzae-on-iron-bioavailability-safety-and-gut-microbiota-in-rats
#16
M B Reddy, Seth M Armah
BACKGROUND: Iron deficiency is a leading global nutritional problem. Ferrous sulfate (FeSO4) is the most common iron source used for supplementation. Because of many side effects associated with its consumption, it is important to identify new forms of iron. OBJECTIVES: To assess the bioavailability of iron-enriched Aspergillus oryzae, Aspiron® (ASP), evaluate the toxicity of high-dose iron supplementation with ASP; and determine ASP impact on gut microbiota in rats...
May 31, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29849501/probiotic-mixture-protects-dextran-sulfate-sodium-induced-colitis-by-altering-tight-junction-protein-expressions-and-increasing-tregs
#17
Yingdi Zhang, Xiaojing Zhao, Yunjuan Zhu, Jingjing Ma, Haiqin Ma, Hongjie Zhang
Bifico is a probiotic mixture containing Bifidobacterium , Lactobacillus acidophilus , and Enterococcus. Studies support that Bifico has a protective effect in experimental colitis (IL-10-deficient and TNBS) models and in patients with inflammatory bowel disease (IBD). However, the mechanism underlying the protective effects of this mixture of probiotic bacteria remains incompletely clear. Here, we investigated the effect of Bifico on intestinal inflammation. In an in vivo experiment, dextran sulfate sodium was used to induce colitis...
2018: Mediators of Inflammation
https://www.readbyqxmd.com/read/29849169/fermentative-spirochaetes-mediate-necromass-recycling-in-anoxic-hydrocarbon-contaminated-habitats
#18
Xiyang Dong, Chris Greening, Thomas Brüls, Ralf Conrad, Kun Guo, Svenja Blaskowski, Farnusch Kaschani, Markus Kaiser, Nidal Abu Laban, Rainer U Meckenstock
Spirochaetes are frequently detected in anoxic hydrocarbon- and organohalide-polluted groundwater, but their role in such ecosystems has remained unclear. To address this, we studied a sulfate-reducing, naphthalene-degrading enrichment culture, mainly comprising the sulfate reducer Desulfobacterium N47 and the rod-shaped Spirochete Rectinema cohabitans HM. Genome sequencing and proteome analysis suggested that the Spirochete is an obligate fermenter that catabolizes proteins and carbohydrates, resulting in acetate, ethanol, and molecular hydrogen (H2 ) production...
May 30, 2018: ISME Journal
https://www.readbyqxmd.com/read/29803719/a-semi-continuous-system-for-monitoring-microbially-influenced-corrosion
#19
Mary M Eid, Kathleen E Duncan, Ralph S Tanner
Microbially influenced corrosion (MIC), also known as biocorrosion, has significant impacts on the environment and economy. Typical systems to study biocorrosion are either dynamic (once-through flow) or static (serum bottle incubations). Dynamic systems can be materials and personnel intensive, while static systems quickly become nutrient limiting and exhibit long incubations. A semi-continuous biocorrosion cell was developed to address these issues. Low carbon shim steel was used as a test surface. Initial results revealed that 50 ppm glutaraldehyde (GLT), a common oil field biocide, in an abiotic cell was 3...
May 24, 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29783128/treatment-of-acidic-sulfate-containing-wastewater-using-revolving-algae-biofilm-reactors-sulfur-removal-performance-and-microbial-community-characterization
#20
Haoyuan Zhou, Yanqing Sheng, Xuefei Zhao, Martin Gross, Zhiyou Wen
Industries such as mining operations are facing challenges of treating sulfur-containing wastewater such as acid mine drainage (AMD) generated in their plant. The aim of this work is to evaluate the use of a revolving algal biofilm (RAB) reactor to treat AMD with low pH (3.5-4) and high sulfate content (1-4 g/L). The RAB reactors resulted in sulfate removal efficiency up to 46% and removal rate up to 0.56 g/L-day, much higher than those obtained in suspension algal culture. The high-throughput sequencing revealed that the RAB reactor contained diverse cyanobacteria, green algae, diatoms, and acid reducing bacteria that contribute the sulfate removal through various mechanisms...
May 18, 2018: Bioresource Technology
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