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https://www.readbyqxmd.com/read/28088016/release-and-cytotoxicity-studies-of-magnetite-ag-antibiotic-nanoparticles-an-interdependent-relationship
#1
Olena Ivashchenko, Anna Woźniak, Emerson Coy, Barbara Peplinska, Jacek Gapinski, Stefan Jurga
Though the cytotoxic properties of magnetite nanoparticles (NPs) are rather well investigated and known to be dose dependent and rather low, surface functionalization can drastically change their properties. To determine whether the cytotoxicity of magnetite/Ag/antibiotic NPs may be associated, among other things, with iron, silver and antibiotic release, this study investigates the release profiles and cytotoxicity of magnetite/Ag/rifampicin and magnetite/Ag/doxycycline NPs compares it similar profiles from magnetite, magnetite/Ag NPs and antibiotics...
January 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28087782/mutation-supply-and-relative-fitness-shape-the-genotypes-of-ciprofloxacin-resistant-escherichia-coli
#2
Douglas L Huseby, Franziska Pietsch, Gerrit Brandis, Linnéa Garoff, Angelica Tegehall, Diarmaid Hughes
Ciprofloxacin is an important antibacterial drug targeting Type II topoisomerases, highly active against Gram-negatives including Escherichia coli The evolution of resistance to ciprofloxacin in E. coli always requires multiple genetic changes, usually including mutations affecting two different drug target genes, gyrA and parC Resistant mutants selected in vitro or in vivo can have many different mutations in target genes and efflux regulator genes that contribute to resistance. Among resistant clinical isolates the genotype, gyrA S83L D87N, parC S80I is significantly overrepresented suggesting that it has a selective advantage...
January 12, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28087648/effect-of-in-vivo-neutralisation-of-tumor-necrosis-factor-alpha-on-the-efficacy-of-antibiotic-treatment-in-systemic-salmonella-enterica-infections
#3
Omar Rossi, Andrew J Grant, Pietro Mastroeni
Immunity can co-operate with antibiotics, but can also antagonize drug efficacy by segregating the bacteria to areas of the body that are less accessible to antimicrobials, and by selecting for subpopulations with low division rates that are often difficult to eradicate. We studied the effect of an anti-inflammatory/immunosuppressive anti-TNFα treatment, which accelerates bacterial growth in the tissues and inhibits or reverses the formation of granulomas, on the efficacy of ampicillin and ciprofloxacin during a systemic Salmonella enterica infection of the mouse...
January 12, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28087617/in-vitro-activity-of-the-antiasthmatic-drug-zafirlukast-against-the-oral-pathogens-porphyromonas-gingivalis-and-streptococcus-mutans
#4
Evelien Gerits, Isolde Van der Massen, Katleen Vandamme, Kaat De Cremer, Katrijn De Brucker, Karin Thevissen, Bruno P A Cammue, Serge Beullens, Maarten Fauvart, Natalie Verstraeten, Jan Michiels
Oral infections are among the most common diseases worldwide. Many protocols for the prevention and treatment of oral infections have been described, yet no golden standard has been developed so far. The antiseptic chlorhexidine and antibiotics are often used in these treatment procedures. However, long-term use of chlorhexidine can lead to side effects and extensive use of antibiotics can promote the development of antibiotic-resistant bacteria, which in turn can compromise the effectiveness of the treatment...
January 12, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28087408/effects-of-loading-concentration-blood-and-synovial-fluid-on-antibiotic-release-and-anti-biofilm-activity-of-bone-cement-beads
#5
Devendra Dusane, Scott Diamond, Cory Knecht, Nicholas Farrar, Casey Peters, Robert Howlin, Matthew Swearingen, Jason Calhoun, Roger D Plaut, Tanya Nocera, Jeffrey Granger, Paul Stoodley
Antibiotic loaded cement beads are commonly used for the treatment of biofilm related orthopaedic periprosthetic infections; however the effects of antibiotic loading and exposure of beads to body fluids on release kinetics are unclear. The purpose of this study was to determine the effects of (i) antibiotic loading density (ii) loading amount (iii) material type and (iv) exposure to body fluids (blood or synovial fluid) on release kinetics and efficacy of antibiotics against planktonic and lawn biofilm bacteria...
January 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28086796/prophylaxis-of-post-erc-infectious-complications-in-patients-with-biliary-obstruction-by-adding-antimicrobial-agents-into-erc-contrast-media-a-single-center-retrospective-study
#6
Hella Wobser, Agnetha Gunesch, Frank Klebl
BACKGROUND: Patients with biliary obstruction are at high risk to develop septic complications after endoscopic retrograde cholangiography (ERC). We evaluated the benefits of local application of antimicrobial agents into ERC contrast media in preventing post-ERC infectious complications in a high-risk study population. METHODS: Patients undergoing ERC at our tertiary referral center were retrospectively included. Addition of vancomycin, gentamicin and fluconazol into ERC contrast media was evaluated in a case-control design...
January 13, 2017: BMC Gastroenterology
https://www.readbyqxmd.com/read/28081345/growing-oxa-23-type-strains-among-carbapenem-resistant-acinetobacter-baumannii-and-tigecycline-as-an-alternate-combination-therapy
#7
Şerife Altun, Zeliha Koçak Tufan, Belgin Altun, Ufuk Önde, Sami Kınıklı, Ali Pekcan Demiröz
BACKGROUND/AIM: The increasing prevalence and global spread of difficult-to-treat carbapenem-resistant Acinetobacter baumannii has become a serious problem. The aim of this study is to investigate the resistance patterns and tigecycline sensitivity of carbapenem-resistant A. baumannii strains. MATERIALS AND METHODS: Acinetobacter strains that were carbapenem-resistant and collected mainly from intensive care units were included into this study. The antibiotic sensitivity/resistance of the strains to other antibiotics and tigecycline were noted...
December 20, 2016: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28078559/empirical-combination-of-a-%C3%AE-lactam-to-vancomycin-may-not-improve-outcomes-of-methicillin-susceptible-staphylococcus-aureus-bacteremia-compared-to-vancomycin-monotherapy
#8
G E Park, J-H Ko, S Y Cho, Y E Ha, N Y Lee, C-I Kang, D R Chung, J-H Song, K R Peck
To evaluate effect of empirical combination of a β-lactam to vancomycin and vancomycin monotherapy in Staphylococcus aureus bacteremia (MSSA-B), we conducted a retrospective cohort study. Electronic medical records of individuals who were diagnosed with MSSA-B between January 2005 and February 2015 at a tertiary care center were reviewed. Patients were classified into three groups according to empirical antibiotic regimen (BL group, β-lactam; VAN group, vancomycin; BV group, combination of β-lactam and vancomycin), and 30-day all-cause mortality of each group was compared...
January 11, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28077022/feasibility-of-a-novel-multispot-nanoarray-for-antibiotic-screening-in-honey
#9
Sara E McNamee, Giulia Rosar, Lidija Persic, Christopher T Elliott, Katrina Campbell
Practical solutions for multiple antibiotic determination in food is required by the food industry and regulators for cost effective screening purposes. This study describes the feasibility in development and preliminary performance of a novel multispot nanoarray for antibiotic screening in honey. Using a multiplex approach the metabolites of the four main nitrofuran antibiotics including morpholinomethyl-2-oxazolidone (AMOZ), 3-amino-2-oxazolidinone (AOZ), semicarbazide (SEM), 1-aminohydantoin (AHD) and chloramphenicol (CAP) were simultaneously detected...
January 12, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28076361/synergy-and-order-effects-of-antibiotics-and-phages-in-killing-pseudomonas-aeruginosa-biofilms
#10
Waqas Nasir Chaudhry, Jeniffer Concepción-Acevedo, Taehyun Park, Saadia Andleeb, James J Bull, Bruce R Levin
In contrast to planktonic cells, bacteria imbedded biofilms are notoriously refractory to treatment by antibiotics or bacteriophage (phage) used alone. Given that the mechanisms of killing differ profoundly between drugs and phages, an obvious question is whether killing is improved by combining antibiotic and phage therapy. However, this question has only recently begun to be explored. Here, in vitro biofilm populations of Pseudomonas aeruginosa PA14 were treated singly and with combinations of two phages and bactericidal antibiotics of five classes...
2017: PloS One
https://www.readbyqxmd.com/read/28075071/multi-target-selection-of-catalytic-antibodies-wih-%C3%AE-lactamase-activity-using-phage-display
#11
Melody A Shahsavarian, Nancy Chaaya, Narciso Costa, Didier Boquet, Alexandre Atkinson, Bernard Offmann, Srini V Kaveri, Sébastien Lacroix-Desmazes, Alain Friboulet, Bérangère Avalle, Séverine Padiolleau-Lefèvre
β-lactamase enzymes responsible for bacterial resistance to antibiotics are among the most important health threats to the human population today. Understanding the increasingly vast structural motifs responsible for the catalytic mechanism of β-lactamases will help improve the future design of new generation antibiotics and mechanism-based inhibitors of these enzymes. Here we report the construction of a large murine scFv phage display library of size 2.7×10(9) with extended diversity by combining different mouse models...
January 11, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28074704/the-toxicology-of-zinc-chloride-smoke-producing-bombs-and-screens
#12
Ayman El Idrissi, Lisanne van Berkel, Nadia E Bonekamp, Diana J Z Dalemans, Marcel A G van der Heyden
CONTEXT: Zinc chloride (ZnCl2)-based smoke bombs and screens are in use since the Second World War (1939-1945). Many case descriptions on ZnCl2 smoke inhalation incidents appeared since 1945. OBJECTIVE: We provide a comprehensive overview of the clinical symptoms and underlying pathophysiology due to exposure to fumes from ZnCl2 smoke producing bombs. In addition, we give a historical overview of treatment regimens and their outcomes. METHODOLOGY: We performed a literature search on Medline, Scopus and Google Scholar databases using combinations of the following search terms "smoke bomb", "smoke screen", "ZnCl2", "intoxication", "poisoning", "case report", "HE smoke", "hexachloroethane smoke", "smoke inhalation" and "white smoke"...
January 11, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28074638/clinical-management-of-candida-albicans-keratomycosis-in-a-bottlenose-dolphin-tursiops-truncatus
#13
Claire A Simeone, John P Traversi, Jenny M Meegan, Carolina LeBert, Carmen M H Colitz, Eric D Jensen
OBJECTIVE: Corneal ulceration secondary to trauma commonly affects marine mammals, often with opportunistic secondary bacterial or fungal infections. This report characterizes the combined use of auriculopalpebral and ophthalmic nerve blocks, adipose-derived stem cells, and subconjunctival injections for successful treatment of corneal trauma and infection in dolphins. ANIMAL STUDIED: An 11-year-old, female bottlenose dolphin (Tursiops truncatus) presented with bilateral diffuse corneal opacities, which progressed to keratomycosis caused by Candida albicans...
January 11, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/28074531/antibiotic-use-during-infectious-episodes-in-the-first-6-months-of-anticancer-treatment-a-swedish-cohort-study-of-children-aged-7-16-years
#14
M Af Sandeberg, E Johansson, L Wettergren, O Björk, O Hertting, A Nilsson
BACKGROUND: Children undergoing cancer therapy are at risk for infectious complications that require hospitalization and antimicrobial therapy. Host factors such as age and underlying disease may predict the risk of severe infections in these children. To describe the increased morbidity due to infections in children with cancer, we characterized the antibiotic use during the infectious complications in a national cohort of children 7-16 years of age with cancer. PROCEDURE: Data on infectious complications were prospectively collected from the medical records of all newly diagnosed children with cancer, aged 7-16 years, in Sweden between 2004 and 2006...
January 11, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28074048/elmenols-c-h-new-angucycline-derivatives-isolated-from-a-culture-of-streptomyces-sp-ifm-11490
#15
Yixizhuoma, Naoki Ishikawa, Mohamed S Abdelfattah, Masami Ishibashi
Chemical investigations of the ethyl acetate extract of Streptomyces sp. IFM 11490 have led to the isolation of six new angucycline metabolites, named elmenols C-H (1-6), along with the previously reported elmonin (7) and elmenols A (8) and B (9). The known LS1924A (10), 6-deoxy-8-methylrabelomycin (11), tetrangulol methyl ether (12) and angucyclinone (13) were additionally identified. The structures of the isolated compounds were elucidated by means of spectroscopic methods including UV, IR, HRESIMS, and 1D and 2D NMR...
January 11, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28073963/in-vitro-activity-of-daptomycin-combined-with-dalbavancin-and-linezolid-and-dalbavancin-with-linezolid-against-mrsa-strains
#16
Gulseren Aktas, Sengul Derbentli
OBJECTIVES: Combination therapies have a distinct advantage over monotherapies in terms of their broad spectrum, synergistic effect and prevention of the emergence of drug resistance. In the present study, the in vitro antibacterial activity of daptomycin combinations with linezolid and dalbavancin, and dalbavancin with linezolid were evaluated against 30 clinical MRSA strains. METHODS: The MICs of all antibiotics were determined using microbroth dilution as described by the CLSI...
September 28, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28071145/bacteriophages-and-their-derivatives-for-the-treatment-and-control-of-food-producing-animal-infections
#17
Carla Carvalho, Ana Rita Costa, Filipe Silva, Ana Oliveira
Nowadays, the world is facing an increasing emergence of antibiotic resistant bacteria. Simultaneously, the banning of some existing antibiotics and the lack of development of new antimicrobials have created an urgent need to find new alternatives against animal infections. Bacteriophages (phages) are naturally occurring predators of bacteria, ubiquitous in the environment, with high host specificity and harmless to animals. For these reasons, phages and their derivatives are being considered valuable antimicrobial alternatives and an opportunity to reduce the current use of antibiotics in agri-food production, increasing animal productivity and providing environmental protection...
January 10, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28069789/hypotension-induced-by-the-concomitant-use-of-a-calcium-channel-blocker-and-clarithromycin
#18
Sayako Takeuchi, Yuki Kotani, Toshihide Tsujimoto
In the elderly, calcium-channel blockers are the first-line treatment for hypertension, and macrolides are commonly prescribed antibiotics. Here we report a 78-year-old man taking nifedipine, diltiazem and carvedilol who presented with persistent hypotension and bradycardia after clarithromycin was prescribed. He was diagnosed with drug-induced hypotension and treated with fluid resuscitation and vasoactive agents. His symptoms gradually improved. He was transferred out of the intensive care unit 3 days after hospitalisation...
January 9, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28069643/gepotidacin-gsk2140944-in-vitro-activity-against-neisseria-gonorrhoeae-mic-mbc-kill-kinetics-checkerboard-pae-sme-tests
#19
D J Farrell, H S Sader, P R Rhomberg, N E Scangarella-Oman, R K Flamm
Gepotidacin, (formerly GSK2140944) is a novel, first in class, triazaacenaphthylene antibacterial, which inhibits bacterial DNA gyrase and topoisomerase IV via a unique mechanism and has demonstrated in vitro activity against Neisseria gonorrhoeae, including drug-resistant strains, and also target pathogens associated with other conventional and biothreat infections. Broth microdilution was used to evaluate the minimum inhibitory/bactericidal concentration (MIC/MBC) activity of gepotidacin and comparators against 25 N...
January 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28068956/cost-effectiveness-of-antibiotic-treatment-strategies-for-community-acquired-pneumonia-results-from-a-cluster-randomized-cross-over-trial
#20
Cornelis H van Werkhoven, Douwe F Postma, Marie-Josee J Mangen, Jan Jelrik Oosterheert, Marc J M Bonten
BACKGROUND: To determine the cost-effectiveness of strategies of preferred antibiotic treatment with beta-lactam/macrolide combination or fluoroquinolone monotherapy compared to beta-lactam monotherapy. METHODS: Costs and effects were estimated using data from a cluster-randomized cross-over trial of antibiotic treatment strategies, primarily from the reduced third payer perspective (i.e. hospital admission costs). Cost-minimization analysis (CMA) and cost-effectiveness analysis (CEA) were performed using linear mixed models...
January 10, 2017: BMC Infectious Diseases
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