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https://www.readbyqxmd.com/read/29334654/phbv-polymer-supported-denitrification-system-efficiently-treated-high-nitrate-concentration-wastewater-denitrification-performance-microbial-community-structure-evolution-and-key-denitrifying-bacteria
#1
Zhongshuo Xu, Liyan Song, Xiaohu Dai, Xiaoli Chai
Biodegradable polymer supported denitrification (BPD) system shows good denitrification performance for the wastewater with low nitrate concentrations. In this study, a BPD system using Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) polymer as carbon source was developed to treat the wastewater with high nitrate concentrations. The denitrification performance, utilization ratio of PHBV polymers, and microbial community structure evolution and key denitrifying bacteria were comprehensively studied. Results indicated that an average nitrate removal efficiency of 99% could be achieved with an influent NO3--N concentration of 100 mg L-1 and a hydraulic retention time (HRT) of 7...
January 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29334612/tempo-oxidized-bacterial-cellulose-pellicle-with-silver-nanoparticles-for-wound-dressing
#2
Chun-Nan Wu, Shih-Chang Fuh, Shin-Ping Lin, Yen-Yi Lin, Hung-Yueh Chen, Jui-Ming Liu, Kuan-Chen Cheng
Biocompatible bacterial cellulose pellicle (BCP) is a candidate for biomedical material such as wound dressing. However, due to lack of antibacterial activity, to grant BCP with the property is crucial for its biomedical application. In the present study, BCP was modified by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation using TEMPO/NaClO/NaBr system at pH 10 to form TEMPO-oxidized BCP (TOBCP) with anionic C6 carboxylate groups. The TOBCP was subsequently ion-exchanged in AgNO3 solution and silver nanoparticles (AgNP) with diameter of ~16...
January 15, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29334545/bacterial-vaginosis-modifies-the-association-between-hormonal-contraception-and-hiv-acquisition
#3
Lisa Haddad, Kristin M Wall, William Kilembe, Bellington Vwailika, Naw Htee, Ilene Brill, Elwyn Chomba, Amanda Tichacek, Susan Allen
OBJECTIVE: To examine BV as an effect modifier for the association between hormonal contraception (HC) and incident HIV infection DESIGN:: Serodiscordant couples enrolled in an open longitudinal cohort in Lusaka, Zambia from 1994-2012. This analysis was restricted to couples with an HIV-positive man enrolled between1994-2002 when a quarterly genital tract examination and HIV testing was performed. METHODS: Multivariate Cox models evaluated the association between contraceptive method and HIV-acquisition, stratified by time-varying BV status...
January 13, 2018: AIDS
https://www.readbyqxmd.com/read/29334470/heterologous-expression-of-rhizobial-celc2-cellulase-impairs-symbiotic-signaling-and-nodulation-in-medicago-truncatula
#4
Marta Robledo, Esther Menéndez, Jose Ignacio Jimenez-Zurdo, Raúl Rivas, Encarna Velazquez, Eustoquio Martinez-Molina, Giles Oldroyd, Pedro F Mateos
The infection of legume plants by rhizobia is tightly regulated to ensure accurate bacterial penetration, infection and development of functionally efficient nitrogen-fixing root nodules. Rhizobial Nod Factors (NF) have key roles in the elicitation of nodulation signalling. Infection of white clover roots also involves the tightly regulated specific breakdown of the non-crystalline apex of cell walls in growing root hairs, which is mediated by Rhizobium leguminosarum bv. trifolii cellulase CelC2. Here, we have analyzed the impact of this endoglucanase on symbiotic signalling in the model legume Medicago truncatula...
January 15, 2018: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29334446/pediatric-community-acquired-pneumonia
#5
Stephanie Posten, Jennifer Reed
Pediatric community acquired pneumonia (CAP) is frequently encountered by medical providers and is one of the most common reasons for hospital admission. CAP is known to cause significant morbidity and mortality, causing greater than 2 million deaths annually worldwide in children younger than five years old. The Infectious Disease Society of America (IDSA) released guidelines in 2011 with recommendations regarding appropriate diagnosis and management of community acquired pneumonia for children greater than 3 months age, with the goal of assisting providers in clinical decision making...
December 2017: South Dakota Medicine: the Journal of the South Dakota State Medical Association
https://www.readbyqxmd.com/read/29334432/antibiotic-use-patterns-in-endoscopic-sinus-surgery-a-survey-of-the-american-rhinologic-society-membership
#6
Christina H Fang, Judd H Fastenberg, Marvin P Fried, Elina Jerschow, Nadeem A Akbar, Waleed M Abuzeid
BACKGROUND: There is a paucity of data supporting antibiotic use in endoscopic sinus surgery (ESS). The objective of this study is to determine perioperative antibiotic use patterns and factors which influence use in ESS. METHODS: An online-based survey was distributed to members of the American Rhinologic Society (ARS). Outcomes included timing of perioperative antibiotic use, practice environment, years of experience, and patient factors that influenced antibiotic use...
January 15, 2018: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/29334430/preclinical-therapeutic-efficacy-of-the-ciprofloxacin-eluting-sinus-stent-for-pseudomonas-aeruginosa-sinusitis
#7
Do-Yeon Cho, Dong-Jin Lim, Calvin Mackey, Daniel Skinner, Christopher Weeks, Gobind S Gill, Robert W Hergenrother, William E Swords, Bradford A Woodworth
BACKGROUND: The ciprofloxacin-coated sinus stent (CSS) has unique therapeutic potential to deliver antibiotics to the sinuses. The objective of this study is to evaluate the efficacy of the CSS stent in eliminating Pseudomonas aeruginosa infection in a rabbit model of sinusitis. METHODS: A ciprofloxacin-eluting sinus stent was created by coating ciprofloxacin/Eudragit RS100 on biodegradable poly-D/L-lactic acid (2 mg). After analyzing in-vitro inhibition of P aeruginosa (PAO-1 strain) biofilm formation, a total of 8 stents (4 shams, 4 CSSs) were placed unilaterally in rabbit maxillary sinuses via dorsal sinusotomy after inducing infection for 1 week with PAO-1...
January 15, 2018: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/29334418/antimicrobial-and-stress-responses-to-increased-temperature-and-bacterial-pathogen-challenge-in-the-holobiont-of-a-reef-building-coral
#8
Jeroen A J M van de Water, Maryam Chaib De Mares, Groves B Dixon, Jean-Baptiste Raina, Bette L Willis, David G Bourne, Madeleine J H van Oppen
Global increases in coral disease prevalence have been linked to ocean warming through changes in coral-associated bacterial communities, pathogen virulence and immune system function. However, the interactive effects of temperature and pathogens on the coral holobiont are poorly understood. Here, we assessed three compartments of the holobiont (host, Symbiodinium, bacterial community) of the coral Montipora aequituberculata challenged with the pathogen Vibrio coralliilyticus and the commensal bacterium Oceanospirillales sp...
January 15, 2018: Molecular Ecology
https://www.readbyqxmd.com/read/29334314/on-the-intrinsic-constraint-of-bacterial-growth-rate-m-tuberculosis-s-view-of-the-protein-translation-capacity
#9
Manlu Zhu, Xiongfeng Dai
In nature, the maximal growth rates vary widely among different bacteria species. Fast-growing bacteria species such as Escherichia coli can have a shortest generation time of 20 min. Slow-growing bacteria species are perhaps best known for Mycobacterium tuberculosis, a human pathogen with a generation time being no less than 16 h. Despite of the significant progress made on understanding the pathogenesis of M. tuberculosis, we know little on the origin of its intriguingly slow growth. From a global view, the intrinsic constraint of the maximal growth rate of bacteria remains to be a fundamental question in microbiology...
January 15, 2018: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/29334204/detection-of-chlamydia-trachomatis-in-pap-smear-samples-from-south-khorasan-province-of-iran
#10
Davod Javanmard, Mahmoodreza Behravan, Malaknaz Ghannadkafi, Alireza Salehabadi, Masood Ziaee, Mohammad Hasan Namaei
Background: Chlamydia trachomatis (CT), the most common bacterial sexually transmitted infection (STI), leads to pelvic inflammatory disease, infertility and chronic pelvic pain in women as well as an increased risk of vertical transmission, conjunctivitis and pneumonitis in infants. It may also be a co-factor along with human papillomavirus (HPV) in cervical cancer progression. We aimed to determine the prevalence of CT genotypes in genital specimens of women from South Khorasan, Iran and to test the association between CT and cytology statistics...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29334195/exoproteome-profiling-reveals-the-involvement-of-the-foldase-prsa-in-the-cell-surface-properties-and-pathogenesis-of-staphylococcus-aureus
#11
Mei-Hui Lin, Chi-Chun Li, Jwu-Ching Shu, Hao-Wei Chu, Chao-Chin Liu, Chih-Ching Wu
Staphylococcus aureus is a bacterial pathogen that produces and exports many virulence factors that cause diseases in human. PrsA, a membrane-bound foldase, is expressed ubiquitously in Gram-positive bacteria and required for the folding of exported proteins into a stable and active structure. To understand the involvement of PrsA in post-translocational protein folding in S. aureus, a PrsA-deficient mutant of S. aureus HG001 was constructed. Using isobaric tags for relative and absolute quantification (iTRAQ)-based mass spectrometry analyses, the exoproteomes of PrsA mutant and wild type S...
January 15, 2018: Proteomics
https://www.readbyqxmd.com/read/29334015/efficacy-of-hyperbaric-oxygen-therapy-in-bacterial-biofilm-eradication
#12
Nicholas E Sanford, Jeremy E Wilkinson, Hao Nguyen, Gabe Diaz, Randall Wolcott
OBJECTIVE: Chronic wounds typically require several concurrent therapies, such as debridement, pressure offloading, and systemic and/or topical antibiotics. The aim of this study was to examine the efficacy of hyperbaric oxygen therapy (HBOT) towards reducing or eliminating bacterial biofilms in vitro and in vivo. METHOD: Efficacy was determined using in vitro grown biofilms subjected directly to HBOT for 30, 60 and 90 minutes, followed by cell viability determination using propidium monoazide-polymerase chain reaction (PMA-PCR)...
January 1, 2018: Journal of Wound Care
https://www.readbyqxmd.com/read/29333932/a-comparison-between-dacc-with-chlorhexidine-acetate-soaked-paraffin-gauze-and-foam-dressing-for-skin-graft-donor-sites
#13
Jun Won Lee, Seong Hoon Park, In Suck Suh, Hii Sun Jeong
OBJECTIVE: Retrograde infections often occur with excessive or incomplete drainage of exudate, or as a result of adherence of dressings to wounds. Dialkylcarbamoyl chloride (DACC) irreversibly binds to bacterial surfaces and physically removes bacteria when dressings are changed. Chlorhexidine acetate-soaked paraffin gauze provides a moist wound-healing environment. We hypothesise that when DACC is combined with chlorhexidine acetate-soaked paraffin gauze, wound healing times decrease...
January 2, 2018: Journal of Wound Care
https://www.readbyqxmd.com/read/29333929/efficacy-of-an-imaging-device-at-identifying-the-presence-of-bacteria-in-wounds-at-a-plastic-surgery-outpatients-clinic
#14
Ellen L Blackshaw, Steven L A Jeffery
OBJECTIVE: Current standard diagnostic practice of bacterial infections by visual inspection under white light is subjective, and microbiological sampling is suboptimal due to high false negative rates and the lengthy time needed for culture results to arrive. The MolecuLight i:X Imaging Device attempts to combat the issues faced in standard practice by providing a non-contact, real-time method of visualising bacteria within wounds. Our aim was to test this imaging device in a series of patients...
January 2, 2018: Journal of Wound Care
https://www.readbyqxmd.com/read/29333810/the-value-of-acute-phase-reactants-and-lightcycler%C3%A2-septifast-test-in-the-diagnosis-of-bacterial-and-viral-infections-in-pediatric-patients
#15
Gulcin Bozlu, Huseyin Tanriverdi, Gonul Aslan, Necdet Kuyucu
INTRODUCTION: This study was performed to investigate the value of acute phase reactants and LightCycler® SeptiFast test to differentiate bacterial and viral infections. POPULATION AND METHODS: Children with fever were enrolled to this prospective study. Peripheral white blood cell (WBC), C-reactive protein (CRP) and procalcitonin (PCT) were studied from all patients on day 1, 3 and 7. Blood culture and chest X-ray were also obtained on day 1. Blood samples for LightCycler® SeptiFast test were obtained in all patients to use them if there was uncertain diagnosis between bacterial or viral infection...
February 1, 2018: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/29333786/the-added-value-of-the-lateral-chest-radiograph-for-diagnosing-community-acquired-pneumonia-in-the-pediatric-emergency-department
#16
Michalle Soudack, Semion Plotkin, Aviva Ben-Shlush, Lisa Raviv-Zilka, Jeffrey M Jacobson, Michael Benacon, Arie Augarten
BACKGROUND: Opinions differ as to the need of a lateral radiograph for diagnosing community acquired pneumonia in children referred to the emergency department. A lateral radiograph increases the ionizing radiation burden but at the same time may improve specificity and sensitivity in this population. OBJECTIVES: To determine the value of the frontal and lateral chest radiographs compared to frontal view stand-alone images for the management of children with suspected community acquired pneumonia seen in a pediatric emergency department...
January 2018: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/29333782/-research-advances-on-the-molecular-mechanism-of-autophagy-regulated-by-porphyromonas-gingivalis
#17
Zhao Yan, Yu Yang, Kou Yurong
Autophagy is an intracellular conservative degradation pathway. This event has been considered as a key step in host defense against bacterial infection. However, Porphyromonas gingivalis, as one of the evidence-sufficient periodontal pathogens, can utilize self-induced autophagy to achieve persistent intracellular survival and proliferation, which enable this organism to escape from host immune surveillance. This review focuses on molecular mechanism of P. gingivalis internalization and autophagy to illuminate its pathogenesis and to further explore the relationship between P...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29333612/fosfomycin-residues-in-colostrum-impact-on-morpho-physiology-and-microbiology-of-suckling-piglets
#18
M B Fernández Paggi, G Martínez, S N Diéguez, D S Pérez Gaudio, J M Decundo, M B Riccio, F A Amanto, M O Tapia, A L Soraci
Fosfomycin is a broad-spectrum bactericidal antibiotic widely used in pig farms for the treatment of a wide variety of bacterial infections. In this study, the elimination of disodium fosfomycin in colostrum/milk of the sow and the impact of this antibiotic on the microbiota and intestinal morpho-physiology of suckling piglets were analyzed. The average amount of fosfomycin eliminated in colostrum (after administration of 15 mg/kg IM) during the first 10 hr postpartum was 0.85 μg/ml, and the mean residual amount ingested by the piglets was 0...
January 14, 2018: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29333583/the-microbial-community-of-tardigrades-environmental-influence-and-species-specificity-of-microbiome-structure-and-composition
#19
Matteo Vecchi, Irene L G Newton, Michele Cesari, Lorena Rebecchi, Roberto Guidetti
Symbiotic associations of metazoans with bacteria strongly influence animal biology since bacteria are ubiquitous and virtually no animal is completely free from them. Tardigrades are micrometazoans famous for their ability to undergo ametabolic states (cryptobiosis) but very little information is available on potential microbial associations. We characterized the microbiomes of six limnoterrestrial tardigrade species belonging to several phylogenetic lines in tandem with the microbiomes of their respective substrates...
January 15, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/29333490/inhibition-of-bacterial-adhesion-on-nanotextured-stainless-steel-316l-by-electrochemical-etching
#20
Yeongseon Jang, Won Tae Choi, Christopher T Johnson, Andrés J García, Preet M Singh, Victor Breedveld, Dennis W Hess, Julie A Champion
Bacterial adhesion to stainless steel 316L (SS316L), which is an alloy typically used in many medical devices and food processing equipment, can cause serious infections along with substantial healthcare costs. This work demonstrates that nanotextured SS316L surfaces produced by electrochemical etching effectively inhibit bacterial adhesion of both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus, but exhibit cytocompatibility and no toxicity toward mammalian cells in vitro. Additionally, the electrochemical surface modification on SS316L results in formation of superior passive layer at the surface, improving corrosion resistance...
January 8, 2018: ACS Biomaterials Science & Engineering
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