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https://www.readbyqxmd.com/read/29224124/underestimated-effects-of-sediments-on-enhanced-startup-performance-of-biofilm-systems-for-polluted-source-water-pretreatment
#1
Zheng-Hui Lv, Jing Wang, Guang-Feng Yang, Li-Juan Feng, Jun Mu, Liang Zhu, Xiang-Yang Xu
In order to evaluate the enhancement mechanisms of enhanced startup performance in biofilm systems for polluted source water pretreatment, three lab-scale reactors with elastic stereo media (ESM) were operated under different enhanced sediment and hydraulic agitation conditions. It is interesting to found the previously underestimated or overlooked effects of sediment on the enhancement of pollutants removal performance and enrichment of functional bacteria in biofilm systems. The maximum NH4+-N removal rate of 0...
December 9, 2017: Biodegradation
https://www.readbyqxmd.com/read/29223450/pesticide-degrading-natural-multidrug-resistance-bacterial-flora
#2
REVIEW
Kirubakaran Rangasamy, Murugan Athiappan, Natarajan Devarajan, Gopinath Samykannu, Javid A Parray, K N Aruljothi, Nowsheen Shameem, Abdulaziz A Alqarawi, Abeer Hashem, Elsayed Fathi Abd Allah
Multidrug-resistant (MDR) bacteria are a growing threat to humans across the world. Antibiotic resistance is a global problem that has developed through continuous antibiotic use, combinatorial antibiotic use, pesticide-antibiotic cross-resistance, and horizontal gene transfer, as well as various other modes. Pesticide-antibiotic cross-resistance and the subsequent expansion of drug-resistant bacteria are critically documented in this review, the primary focus of which is to assess the impact of indiscriminate pesticide use on the development of microbial communities with parallel pesticide and multidrug resistance...
December 6, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29222953/bacterial-community-changes-in-copper-and-pex-drinking-water-pipeline-biofilms-under-extra-disinfection-and-magnetic-water-treatment
#3
Jenni Inkinen, Balamuralikrishna Jayaprakash, Merja Ahonen, Tarja Pitkänen, Riika Mäkinen, Anna Pursiainen, Jorge W Santo Domingo, Heidi Salonen, Michael Elk, Minna M Keinänen-Toivola
AIMS: To study stability of biofilms and water quality in pilot scale drinking water copper and PEX pipes in changing conditions (extra disinfection, magnetic water treatment MWT). METHODS AND RESULTS: Next-generation sequencing (NGS) of 16S ribosomal RNA genes (rDNA) to describe total bacterial community and ribosomal RNA (rRNA) to describe active bacterial members in addition to traditional microbiological methods were applied. Biofilms from control copper and PEX pipes shared same most abundant bacteria (Methylobacterium spp...
December 9, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29220810/simultaneous-efficient-removal-of-oxyfluorfen-with-electricity-generation-in-a-microbial-fuel-cell-and-its-microbial-community-analysis
#4
Qinghua Zhang, Lei Zhang, Han Wang, Qinrui Jiang, Xiaoyu Zhu
The performance of a microbial fuel cell (MFC) to degrade oxyfluorfen was investigated. Approximately 77% of 50 mg/L oxyfluorfen was degraded within 24 h by anodic biofilm. The temperature, pH, and initial oxyfluorfen concentration had a significant effect on oxyfluorfen degrading, and a maximum degradation rate of 94.95% could theoretically be achieved at 31.96 °C, a pH of 7.65, and an initial oxyfluorfen concentration of 120.05 mg/L. Oxyfluorfen was further catabolized through various microbial metabolism pathways...
December 2, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29219541/spatiotemporal-self-organization-of-fluctuating-bacterial-colonies
#5
Tobias Grafke, Michael E Cates, Eric Vanden-Eijnden
We model an enclosed system of bacteria, whose motility-induced phase separation is coupled to slow population dynamics. Without noise, the system shows both static phase separation and a limit cycle, in which a rising global population causes a dense bacterial colony to form, which then declines by local cell death, before dispersing to reinitiate the cycle. Adding fluctuations, we find that static colonies are now metastable, moving between spatial locations via rare and strongly nonequilibrium pathways, whereas the limit cycle becomes almost periodic such that after each redispersion event the next colony forms in a random location...
November 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29219055/the-role-of-nanoparticles-in-the-inhibition-of-multidrug-resistant-bacteria-and-biofilms
#6
Manaf AlMatar, Essam A Makky, Isil Var, Fatih Koksal
BACKGROUND: Until recently, one of the main reasons for mortality has been infectious diseases, and bacteria that are drug-resistant have emerged as a result of the wide application, as well as the misuse, of antibacterial medications. Having multidrug-resistance, bacteria present a great problem for the efficient management of bacterial infections and this challenge has resulted in the creation of other means of dealing with bacterial diseases. Of late, metallic nanoparticles (NPs), employed as antibacterial agents, have the potential for use against resistance to bacterial drugs...
December 7, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29216517/go-agcl-ag-nanocomposites-with-enhanced-visible-light-driven-catalytic-properties-for-antibacterial-and-biofilm-disrupting-applications
#7
Xinhuan Wang, Qiusen Han, Ning Yu, Tian Wang, Chen Wang, Rong Yang
Nanomaterials with visible light-driven photocatalytic activity have attracted much attention due to their excellent abilities in degradation of various organic pollutants as well as inactivating bacteria. Herein, graphene oxide (GO) enwrapped silver chloride/silver (AgCl/Ag) nanocomposites with high visible light absorption were designed and fabricated as efficient antibacterial agents. AgCl NPs were synthesized in the presence of GO first and Ag NPs were coated on AgCl surface by heat reduction to form GO-AgCl/Ag nanocomposites...
November 26, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29216487/microplastics-increase-impact-of-treated-wastewater-on-freshwater-microbial-community
#8
Ester M Eckert, Andrea Di Cesare, Marie Therese Kettner, Maria Arias-Andres, Diego Fontaneto, Hans-Peter Grossart, Gianluca Corno
Plastic pollution is a major global concern with several million microplastic particles entering every day freshwater ecosystems via wastewater discharge. Microplastic particles stimulate biofilm formation (plastisphere) throughout the water column and have the potential to affect microbial community structure if they accumulate in pelagic waters, especially enhancing the proliferation of biohazardous bacteria. To test this scenario, we simulated the inflow of treated wastewater into a temperate lake using a continuous culture system with a gradient of concentration of microplastic particles...
December 4, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29216242/the-oxyr-regulated-phnw-gene-encoding-2-aminoethylphosphonate-pyruvate-aminotransferase-helps-protect-pseudomonas-aeruginosa-from-tert-butyl-hydroperoxide
#9
Warunya Panmanee, Nisanart Charoenlap, Sopapan Atichartpongkul, Aekkapol Mahavihakanont, Matthew D Whiteside, Geoff Winsor, Fiona S L Brinkman, Skorn Mongkolsuk, Daniel J Hassett
The LysR member of bacterial transactivators, OxyR, governs transcription of genes involved in the response to H2O2 and organic (alkyl) hydroperoxides (AHP) in the Gram-negative pathogen, Pseudomonas aeruginosa. We have previously shown that organisms lacking OxyR are rapidly killed by <2 or 500 mM H2O2 in planktonic and biofilm bacteria, respectively. In this study, we first employed a bioinformatic approach to elucidate the potential regulatory breadth of OxyR by scanning the entire P. aeruginosa PAO1 genome for canonical OxyR promoter recognition sequences (ATAG-N7-CTAT-N7-ATAG-N7-CTAT)...
2017: PloS One
https://www.readbyqxmd.com/read/29215356/the-presence-of-biofilm-forming-microorganisms-on-hydrotherapy-equipment-and-facilities
#10
Natalia Jarząb, Maciej Walczak
Hydrotherapy equipment provides a perfect environment for the formation and growth of microbial biofilms. Biofilms may reduce the microbiological cleanliness of hydrotherapy equipment and harbour opportunistic pathogens and pathogenic bacteria. The aims of this study were to investigate the ability of microorganisms that colonize hydrotherapy equipment to form biofilms, and to assess the influence of temperature and nutrients on the rate of biofilm formation. Surface swab samples were collected from the whirlpool baths, inhalation equipment and submerged surfaces of a brine pool at the spa center in Ciechocinek, Poland...
October 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/29215338/evaluation-of-antimicrobial-durability-and-anti-biofilm-effects-in-urinary-catheters-against-enterococcus-faecalis-clinical-isolates-and-reference-strains
#11
Didem Kart, Ayşe Semra Kustimur, Meral Sağıroğlu, Ayşe Kalkancı
BACKGROUND: Enterococcus faecalis, Escherichia coli, Staphylococcus epidermidis, Pseudomonas aeruginosa and Candida albicans biofilms are major causes of catheter-associated urinary tract infections. Antimicrobial-coated or impregnated urinary catheters are seen as a possible way to prevent these infections. AIMS: To determine the biofilm-forming ability of 89 E. faecalis isolates from urinary tract infections and to compare several urinary catheters for antimicrobial durability and the inhibitory effects on biofilm formation of different laboratory strains and clinical isolates of E...
December 1, 2017: Balkan Medical Journal
https://www.readbyqxmd.com/read/29215297/virulence-genes-and-antimicrobial-resistance-in-escherichia-coli-from-cheese-made-from-unpasteurized-milk-in-brazil
#12
Anna C L P de Campos, Juan J Puño-Sarmiento, Leonardo P Medeiros, Luís E S Gazal, Renato Pariz Maluta, Armando Navarro, Renata K T Kobayashi, Eder P Fagan, Gerson Nakazato
Cow raw milk cheese is widely eaten in Brazil. These products may be contaminated with pathogenic bacteria. In this work, we investigated the presence of Escherichia coli in raw milk cheese from different States in Brazil. From 147 "Minas" cheese samples, 28 cheeses were positive for E. coli. Among 39 E. coli isolates of the cheeses, one was positive for eae and negative for bpfA and efa1/lifA using PCR, and so was classified as atypical Enteropathogenic E. coli (aEPEC). Two other isolates were positive for extraintestinal pathogenic E...
December 7, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/29215258/plasma-functionalized-solution-a-potent-antimicrobial-agent-for-biomedical-applications-from-antibacterial-therapeutics-to-biomaterial-surface-engineering
#13
Joo Young Park, Sanghoo Park, Wonho Choe, Hae In Yong, Cheorun Jo, Kijung Kim
Deadly diseases caused by pathogenic bacteria and viruses have increasingly victimized humans; thus, the importance of disinfection has increased in medical settings as well as in food and agricultural industries. Plasma contains multiple bactericidal agents, including reactive species, charged particles, and photons, which can have synergistic effects. In particular, the chemicals formed in aqueous solution during plasma exposure have the potential for high antibacterial activity against various bacterial infections...
December 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29214175/what-healthcare-workers-should-know-about-environmental-bacterial-contamination-in-the-intensive-care-unit
#14
REVIEW
Vincenzo Russotto, Andrea Cortegiani, Teresa Fasciana, Pasquale Iozzo, Santi Maurizio Raineri, Cesare Gregoretti, Anna Giammanco, Antonino Giarratano
Intensive care unit- (ICU-) acquired infections are a major health problem worldwide. Inanimate surfaces and equipment contamination may play a role in cross-transmission of pathogens and subsequent patient colonization or infection. Bacteria contaminate inanimate surfaces and equipment of the patient zone and healthcare area, generating a reservoir of potential pathogens, including multidrug resistant species. Traditional terminal cleaning methods have limitations. Indeed patients who receive a bed from prior patient carrying bacteria are exposed to an increased risk (odds ratio 2...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29211965/early-detection-of-biofouling-on-water-purification-membranes-by-ambient-ionization-mass-spectrometry-imaging
#15
Swathy Jakka Ravindran, Ramesh Kumar, Amitava Srimany, Ligy Philip, Thalappil Pradeep
By direct analysis of water purification membranes using ambient ionization mass spectrometry, an attempt has been made to understand the molecular signatures of bacterial fouling. Membrane based purification methods are used extensively in water treatment and a major challenge for them is biofouling. The build-up of microbes and their extracellular polymeric matrix clog the membranes and reduce their efficiency. To understand the early stages of bacterial fouling on water purification membranes, we have used Desorption Electrospray Ionization Mass Spectrometry (DESI MS), where ion formation occurs in ambient conditions and the ionization event is surface sensitive...
December 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29209465/two-component-signal-transduction-systems-in-oral-bacteria
#16
REVIEW
Renata O Mattos-Graner, Margaret J Duncan
We present an overview of how members of the oral microbiota respond to their environment by regulating gene expression through two-component signal transduction systems (TCSs) to support conditions compatible with homeostasis in oral biofilms or drive the equilibrium toward dysbiosis in response to environmental changes. Using studies on the sub-gingival Gram-negative anaerobe Porphyromonas gingivalis and Gram-positive streptococci as examples, we focus on the molecular mechanisms involved in activation of TCS and species specificities of TCS regulons...
2017: Journal of Oral Microbiology
https://www.readbyqxmd.com/read/29209305/unveiling-and-characterizing-early-bilateral-interactions-between-biofilm-and-the-mouse-innate-immune-system
#17
REVIEW
Christiane Forestier, Elisabeth Billard, Geneviève Milon, Pascale Gueirard
A very substantial progress has been made in our understanding of infectious diseases caused by invasive bacteria. Under their planktonic forms, bacteria transiently reside in the otherwise sterile mammal body tissues, as the physiological inflammation insures both their clearance and repair of any tissue damage. Yet, the bacteria prone to experience planktonic to biofilm developmental transition still need to be studied. Of note, sessile bacteria not only persist but also concur preventing the effectors and regulators of the physiological inflammation to operate...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29209288/antimicrobial-effects-of-sulfonyl-derivative-of-2-5h-furanone-against-planktonic-and-biofilm-associated-methicillin-resistant-and-susceptible-staphylococcus-aureus
#18
Irshad S Sharafutdinov, Elena Y Trizna, Diana R Baidamshina, Maria N Ryzhikova, Regina R Sibgatullina, Alsu M Khabibrakhmanova, Liliya Z Latypova, Almira R Kurbangalieva, Elvira V Rozhina, Mareike Klinger-Strobel, Rawil F Fakhrullin, Mathias W Pletz, Mikhail I Bogachev, Airat R Kayumov, Oliwia Makarewicz
The gram-positive opportunistic bacterium Staphylococcus aureus is one of the most common causatives of a variety of diseases including skin and skin structure infection or nosocomial catheter-associated infections. The biofilm formation that is an important virulence factor of this microorganism renders the antibiotic therapy ineffective, because biofilm-embedded bacteria exhibit strongly increased tolerance to antimicrobials. Here, we describe a novel 3-chloro-5(S)-[(1R,2S,5R)-2-isopropyl-5-methylcyclohexyloxy]-4-[4-methylphenylsulfonyl]-2(5H)-furanone (F105), possessing a sulfonyl group and l-menthol moiety...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29207708/in-vitro-anti-cariogenic-plaque-effects-of-essential-oils-extracted-from-culinary-herbs
#19
Kornsit Wiwattanarattanabut, Suwan Choonharuangdej, Theerathavaj Srithavaj
Introduction: Cariogenic bacteria including mutans streptococci and lactobacilli are partly but significantly involved in dental caries development. An effective prevention strategy against dental caries is to decrease the accumulation of this microbiota either in planktonic or in biofilm form. Aim: To examine the antimicrobial and anti-plaque effects of some culinary herbs (spices), so the herbs are plausibly used as alternative and effective herbal plaque control supplements to promote good oral health...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29207350/mobile-genetic-elements-and-antibiotic-resistance-in-mine-soil-amended-with-organic-wastes
#20
Carlos Garbisu, Olatz Garaiyurrebaso, Anders Lanzén, Itxaso Álvarez-Rodríguez, Lide Arana, Fernando Blanco, Kornelia Smalla, Elisabeth Grohmann, Itziar Alkorta
Metal resistance has been associated with antibiotic resistance due to co- or cross-resistance mechanisms. Here, metal contaminated mine soil treated with organic wastes was screened for the presence of mobile genetic elements (MGEs). The occurrence of conjugative IncP-1 and mobilizable IncQ plasmids, as well as of class 1 integrons, was confirmed by PCR and Southern blot hybridization, suggesting that bacteria from these soils have gene-mobilizing capacity with implications for the dissemination of resistance factors...
December 2, 2017: Science of the Total Environment
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