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https://www.readbyqxmd.com/read/28335198/gold-nanoparticles-an-efficient-antimicrobial-agent-against-enteric-bacterial-human-pathogen
#1
Shahzadi Shamaila, Noshin Zafar, Saira Riaz, Rehana Sharif, Jawad Nazir, Shahzad Naseem
Enteric bacterial human pathogens, i.e., Escherichia coli, Staphylococcus aureus, Bacillus subtilis and Klebsiella pneumoniae, are the major cause of diarrheal infections in children and adults. Their structure badly affects the human immune system. It is important to explore new antibacterial agents instead of antibiotics for treatment. This project is an attempt to explain how gold nanoparticles affect these bacteria. We investigated the important role of the mean particle size, and the inhibition of a bacterium is dose-dependent...
April 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334649/binding-of-tem-1-beta-lactamase-to-beta-lactam-antibiotics-by-frontal-affinity-chromatography
#2
Xiu Chen, Yuhua Li, Yan Zhang, Jianting Yang, Liujiao Bian
TEM-1 beta-lactamases can accurately catalyze the hydrolysis of the beta-lactam rings in beta-lactam antibiotics, which make beta-lactam antibiotics lose its activity, and the prerequisite for the hydrolysis procedure in the binding interaction of TEM-1 beta-lactamases with beta-lactam antibiotics is the beta-lactam rings in beta-lactam antibiotics. Therefore, the binding of TEM-1 beta-lactamase to three beta-lactam antibiotics including penicillin G, cefalexin as well as cefoxitin was explored here by frontal affinity chromatography in combination with fluorescence spectra, adsorption and thermodynamic data in the temperature range of 278-288K under simulated physiological conditions...
March 18, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28333759/the-absence-of-fever-is-associated-with-higher-mortality-and-decreased-antibiotic-and-iv-fluid-administration-in-emergency-department-patients-with-suspected-septic-shock
#3
Daniel J Henning, Jeremy R Carey, Kimie Oedorf, Danielle E Day, Colby S Redfield, Colin J Huguenel, Jonathan C Roberts, Leon D Sanchez, Richard E Wolfe, Nathan I Shapiro
OBJECTIVE: This study evaluates whether emergency department septic shock patients without a fever (reported or measured) receive less IV fluids, have decreased antibiotic administration, and suffer increased in-hospital mortality. DESIGN: This was a secondary analysis of a prospective, observational study of patients with shock. SETTING: The study was conducted in an urban, academic emergency department. PATIENTS: The original study enrolled consecutive adult (aged 18 yr or older) emergency department patients from November 11, 2012, to September 23, 2013, who met one of the following shock criteria: 1) systolic blood pressure less than 90 mm Hg after at least 1L IV fluids, 2) new vasopressor requirement, or 3) systolic blood pressure less than 90 mm Hg and IV fluids held for concern of fluid overload...
March 22, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28333608/morbidity-in-pregnant-women-associated-with-unverified-penicillin-allergies-antibiotic-use-and-group-b-streptococcus-infections
#4
Shilpa H Desai, Michael S Kaplan, Qiaoling Chen, Eric M Macy
CONTEXT: The morbidity potentially associated with unverified penicillin allergy in pregnant women, with and without group B streptococcus (GBS) infections, is unknown. Penicillin allergy testing is safe during pregnancy but is done infrequently. OBJECTIVE: To determine morbidity associated with antibiotic use in a large cohort of pregnant women, with and without an unverified history of penicillin allergy, and with and without GBS. DESIGN: Retrospective...
2017: Permanente Journal
https://www.readbyqxmd.com/read/28333335/saccharomyces-boulardii-cncm-i-745-restores-intestinal-barrier-integrity-by-regulation-of-e-cadherin-recycling
#5
Chloé Terciolo, Aurélie Dobric, Mehdi Ouaissi, Carole Siret, Gilles Breuzard, Françoise Silvy, Bastien Marchiori, Sébastien Germain, Renaté Bonier, Adel Hama, Roisin Owens, Dominique Lombardo, Véronique Rigot, Frédéric André
Background and Aims: Alteration in intestinal permeability is the main factor underlying the pathogenesis of many diseases affecting the gut, such as inflammatory bowel disease (IBD). Characterization of molecules targeting the restoration of intestinal barrier integrity is therefore vital for the development of alternative therapies. The yeast Saccharomyces boulardii CNCM I-745 (Sb), used to prevent and treat antibiotic-associated infectious and functional diarrhea, may have a beneficial effect in the treatment of IBD...
February 22, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28333294/antibiotic-consumption-by-new-zealand-children-exposure-is-near-universal-by-the-age-of-5%C3%A2-years
#6
Mark R Hobbs, Cameron C Grant, Stephen R Ritchie, Carol Chelimo, Susan M B Morton, Sarah Berry, Mark G Thomas
Background: Increasing concerns about antibiotic resistance and microbiome disruption have stimulated interest in describing antibiotic consumption in young children. Young children are an age group for whom antibiotics are frequently prescribed. Objectives: To describe community antibiotic dispensing during the first 5 years of life in a large, socioeconomically and ethnically diverse cohort of children, and to determine how antibiotic dispensing varied between population subgroups...
March 13, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333283/rch51-a-multiply-antibiotic-resistant-acinetobacter-baumannii-st103ip-isolate-carries-resistance-genes-in-three-plasmids-including-a-novel-potentially-conjugative-plasmid-carrying-oxa235-in-transposon-tn6252
#7
Mohammad Hamidian, Steven J Nigro, Rebecca M Hartstein, Ruth M Hall
Objectives: To determine the identity and context of genes conferring antibiotic resistance in a sporadic multiply antibiotic-resistant Acinetobacter baumannii recovered at Royal Children's Hospital, Brisbane. Methods: The antibiotic resistance phenotype for 23 antibiotics was determined using disc diffusion or MIC determination. The whole-genome sequence of RCH51 was determined using the Illumina HiSeq platform. Antibiotic resistance determinants were identified using ResFinder...
March 13, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333179/obtaining-antibiotics-online-from-within-the-uk-a-cross-sectional-study
#8
Sara Elizabeth Boyd, Luke Stephen Prockter Moore, Mark Gilchrist, Ceire Costelloe, Enrique Castro-Sánchez, Bryony Dean Franklin, Alison Helen Holmes
Background: Improved antibiotic stewardship (AS) and reduced prescribing in primary care, with a parallel increase in personal internet use, could lead citizens to obtain antibiotics from alternative sources online. Objectives: A cross-sectional analysis was performed to: (i) determine the quality and legality of online pharmacies selling antibiotics to the UK public; (ii) describe processes for obtaining antibiotics online from within the UK; and (iii) identify resulting AS and patient safety issues...
February 17, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333052/pmma-titania-floating-macrospheres-for-the-photocatalytic-remediation-of-agro-pharmaceutical-wastewater
#9
Adam C Hartley, Joseph B Moss, Kyle J Keesling, Nathanael J Moore, Justin D Glover, Joel E Boyd
Antibiotics such as tetracycline are used on a large scale in agriculture, and can become concentrated in wastewater lagoons that are used in conjunction with confined animal feeding operations. Solar-illuminated titanium dioxide can be used to photocatalytically degrade aqueous tetracycline, but its application in a lagoon environment requires that the photocatalyst be supported on a macroscopic support material to prevent loss of the nanoscale photocatalyst into the environment. In this work, titanium dioxide was deposited within a porous poly(methyl methacrylate) film on the surface of floating 7...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332827/subcellular-chemical-imaging-of-antibiotics-in-single-bacteria-using-c60-secondary-ion-mass-spectrometry
#10
Hua Tian, David A Six, Thomas Krucker, Jennifer A Leeds, Nicholas Winograd
The inherent difficulty of discovering new and effective antibacterials and the rapid development of resistance particularly in Gram-negative bacteria, illustrates the urgent need for new methods that enable rational drug design. Here we report the development of 3D imaging cluster secondary ion mass spectrometry (SIMS) as a label-free approach to chemically map small molecules in aggregated and single Escherichia coli cells, with ~300 nm spatial resolution and high chemical sensitivity. The feasibility of quantitative analysis was explored, and a non-linear relationship between treatment dose and signal for tetracycline and ampicillin, two clinically-used antibacterials, was observed...
March 23, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28332362/signal-detection-of-imipenem-compared-to-other-drugs-from-korea-adverse-event-reporting-system-database
#11
Kyounghoon Park, Mick Soukavong, Jungmee Kim, Kyoung Eun Kwon, Xue Mei Jin, Joongyub Lee, Bo Ram Yang, Byung Joo Park
PURPOSE: To detect signals of adverse drug events after imipenem treatment using the Korea Institute of Drug Safety & Risk Management-Korea adverse event reporting system database (KIDS-KD). MATERIALS AND METHODS: We performed data mining using KIDS-KD, which was constructed using spontaneously reported adverse event (AE) reports between December 1988 and June 2014. We detected signals calculated the proportional reporting ratio, reporting odds ratio, and information component of imipenem...
May 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/28331973/green-fluorescent-protein-as-a-reporter-for-the-spatial-and-temporal-expression-of-actiii-in-streptomyces-coelicolor
#12
Fernando Santos-Beneit, Jeff Errington
Polyketides constitute a large group of structurally diverse natural products with useful biological activities. Insights into their biosynthetic mechanisms are crucial for developing new structures. One of the most studied model polyketide is the blue-pigmented antibiotic actinorhodin, produced by Streptomyces coelicolor. This aromatic polyketide is synthesized by minimal type II polyketide synthases and tailoring enzymes. The ActIII actinorhodin ketoreductase is a key tailoring enzyme in actinorhodin biosynthesis...
March 22, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28330735/vancomycin-loaded-nanobubbles-a-new-platform-for-controlled-antibiotic-delivery-against-methicillin-resistant-staphylococcus-aureus-infections
#13
Monica Argenziano, Giuliana Banche, Anna Luganini, Nicole Finesso, Valeria Allizond, Giulia Rossana Gulino, Amina Khadjavi, Rita Spagnolo, Vivian Tullio, Giuliana Giribaldi, Caterina Guiot, Anna Maria Cuffini, Mauro Prato, Roberta Cavalli
Vancomycin (Vm) currently represents the gold standard against methicillin-resistant Staphylococcus aureus (MRSA) infections. However, it is associated with low oral bioavailability, formulation stability issues, and severe side effects upon systemic administration. These drawbacks could be overcome by Vm topical administration if properly encapsulated in a nanocarrier. Intriguingly, nanobubbles (NBs) are responsive to physical external stimuli such as ultrasound (US), promoting drug delivery. In this work, perfluoropentane (PFP)-cored NBs were loaded with Vm by coupling to the outer dextran sulfate shell...
March 19, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28330268/antimicrobial-activity-of-pvp-coated-silver-nanoparticles-synthesized-by-lysinibacillus-varians
#14
Divya Bhatia, Ashwani Mittal, Deepak Kumar Malik
Emergence of resistant microbes to conventional antibiotics and increased emphasis on health-care costs has raised the concern for the development of new effective antimicrobial reagents. Silver nanoparticles being an excellent broad-spectrum antibacterial agent could be considered as a suitable alternative for existing antibiotic. This study demonstrates the extra-cellular synthesis of stable silver nanoparticles using supernatant of Lysinibacillus varians. The synthesized silver nanoparticles were characterized by using UV-visible spectrum analysis, X-ray diffraction, Transmission electron microscopy (TEM) and FT-IR analysis...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329348/outcome-and-treatment-of-nocardiosis-after-solid-organ-transplantation-new-insights-from-a-european-study
#15
David Lebeaux, Romain Freund, Christian van Delden, Hélène Guillot, Sierk D Marbus, Marie Matignon, Eric Van Wijngaerden, Benoit Douvry, Julien De Greef, Fanny Vuotto, Leïla Tricot, Mario Fernández-Ruiz, Jacques Dantal, Cédric Hirzel, Jean-Philippe Jais, Veronica Rodriguez-Nava, Frédérique Jacobs, Olivier Lortholary, Julien Coussement
Background: Solid organ transplant (SOT) recipients are at risk of nocardiosis, a rare opportunistic bacterial infection, but prognosis and outcome of these patients are poorly defined. Our objectives were to identify factors associated with one-year mortality after nocardiosis and describe the outcome of patients receiving short-course antibiotics (≤120 days). Methods: We analyzed data from a multicenter European case-control study that included 117 SOT recipients with nocardiosis diagnosed between 2000 and 2014...
February 4, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28326781/the-berkeleylactones-antibiotic-macrolides-from-fungal-coculture
#16
Andrea A Stierle, Donald B Stierle, Daniel Decato, Nigel D Priestley, Jeremy B Alverson, John Hoody, Kelly McGrath, Dorota Klepacki
A carefully timed coculture fermentation of Penicillium fuscum and P. camembertii/clavigerum yielded eight new 16-membered-ring macrolides, berkeleylactones A-H (1, 4, 6-9, 12, 13), as well as the known antibiotic macrolide A26771B (5), patulin, and citrinin. There was no evidence of the production of the berkeleylactones or A26771B (5) by either fungus when grown as axenic cultures. The structures were deduced from analyses of spectral data, and the absolute configurations of compounds 1 and 9 were determined by single-crystal X-ray crystallography...
March 22, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28326209/neisseria-meningitidis-infecting-a-prosthetic-knee-joint-a-new-case-of-an-unusual-disease
#17
Berta Becerril Carral, Elvira Alarcón Manoja, Salvador López Cárdenas, Jesús Canueto Quintero
Primary meningococcal meningitis is an infrequent but known disease. However, the infection of a prosthetic joint with Neisseria meningitidis is rare. We hereby describe the second case of an arthroplasty infected with Neisseria meningitidis that responded favourably to prosthesis retention with surgical debridement, in combination with antibiotics treatment.
2017: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/28325220/action-of-antibiotic-oxacillin-on-in%C3%A2-vitro-growth-of-methicillin-resistant-staphylococcus-aureus-mrsa-previously-treated-with-homeopathic-medicines
#18
Tânia Aguiar Passeti, Leandro Ribeiro Bissoli, Ana Paula Macedo, Registila Beltrame Libame, Susana Diniz, Silvia Waisse
BACKGROUND: Resistance to antibiotics is a major public health concern worldwide. New treatment options are needed and homeopathy is one such option. We sought to assess the effect of the homeopathic medicine Belladonna (Bell) and a nosode (biotherapy) prepared from a multi-drug resistant bacterial species, methicillin-resistant Staphylococcus aureus (MRSA), on the same bacterium. METHODS: Bell and MRSA nosode were prepared in 6cH and 30cH potencies in 30% alcohol and sterile water, according to the Brazilian Homeopathic Pharmacopeia and tested on MRSA National Collection of Type Cultures (NCTC) 10442...
February 2017: Homeopathy: the Journal of the Faculty of Homeopathy
https://www.readbyqxmd.com/read/28324670/relationship-of-antibiotic-treatment-to-recovery-after-acute-fev1-decline-in-children-with-cystic-fibrosis
#19
Wayne J Morgan, Jeffrey S Wagener, David J Pasta, Stefanie J Millar, Donald R VanDevanter, Michael W Konstan
RATIONALE: Children with cystic fibrosis often suffer acute declines in lung function. We previously showed that such declines are not always treated with antibiotics, but did not assess whether treatment improves the likelihood of recovery. OBJECTIVES: To determine whether new antibiotic treatment was associated with recovery from acute FEV1 decline. METHODS: We studied episodes of FEV1 decline (≥10% from baseline) from the Epidemiologic Study of Cystic Fibrosis...
March 21, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28323406/affinity-selection-mass-spectrometry-identifies-a-novel-antibacterial-rna-polymerase-inhibitor
#20
Scott S Walker, David Degen, Elliott Nickbarg, Donna Carr, Aileen Soriano, Mihir Baran Mandal, Ronald E Painter, Payal R Sheth, Li Xiao, Xinwei Sher, Nicholas Murgolo, Jing Su, David B Olsen, Richard H Ebright, Katherine Young
The growing prevalence of drug-resistant Gram-negative bacteria is a significant global threat to human health. Rifampicin, an RNA polymerase-targeting agent, is an important part of the antibacterial armamentarium; however the emergence of resistance requires that it be used against only certain infections and usually in combination with another antibiotic. While rifampicin has significant clinical limitations, it does show that bacterial RNA polymerase can be an effective target for antibacterial intervention...
March 21, 2017: ACS Chemical Biology
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