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time dependent antibiotics

Christen Ravn, Ulrika Furustrand Tafin, Bertrand Bétrisey, Søren Overgaard, Andrej Trampuz
Background and purpose - Antibiotic treatment of patients before specimen collection reduces the ability to detect organisms by culture. We investigated the suppressive effect of antibiotics on the growth of non-adherent, planktonic, and surface-related biofilm bacteria in vitro by using sonication and microcalorimetry methods. Patients and methods - Biofilms of Staphylococcus aureus, S. epidermidis, Escherichia coli, and Propionibacterium acnes were formed on porous glass beads and exposed for 24 h to antibiotic concentrations from 1 to 1,024 times the minimal inhibitory concentration (MIC) of vancomycin, daptomycin, rifampin, flucloxacillin, or ciprofloxacin...
October 24, 2016: Acta Orthopaedica
Nadine Czekalski, Stefanie Imminger, Elisabeth Salhi, Marjan Veljkovic, Karolin Kleffel, David Drissner, Frederik Hammes, Helmut Bürgmann, Urs von Gunten
Ozone, a strong oxidant and disinfectant, seems ideal to cope with future challenges of water treatment, such as micropollutants, multiresistant bacteria (MRB) and even intracellular antibiotic resistance genes (ARG), but information on the latter is scarce. In ozonation experiments we simultaneously determined kinetics and dose-dependent inactivation of Escherichia coli and its plasmid-encoded sulfonamide resistance gene sul1 in different water matrixes. Effects in E. coli were compared to an autochthonous wastewater community...
October 24, 2016: Environmental Science & Technology
Jason Karslake, Jeff Maltas, Peter Brumm, Kevin B Wood
The inoculum effect (IE) is an increase in the minimum inhibitory concentration (MIC) of an antibiotic as a function of the initial size of a microbial population. The IE has been observed in a wide range of bacteria, implying that antibiotic efficacy may depend on population density. Such density dependence could have dramatic effects on bacterial population dynamics and potential treatment strategies, but explicit measures of per capita growth as a function of density are generally not available. Instead, the IE measures MIC as a function of initial population size, and population density changes by many orders of magnitude on the timescale of the experiment...
October 2016: PLoS Computational Biology
Markus Hoffmann, Asita Fazel, Kai-Gerrit Mews, Petra Ambrosch
OBJECTIVES: To underline the value of the microendoscopic CO2 -Laser assisted treatment (MEDCO2 ) of Zenker's diverticulum by investigating a large patient cohort treated in a single medical center. DESIGN: Retrospective Cohort Study of consecutive patients. SETTING: Dept. of Otorhinolaryngology, Head & Neck Surgery, Christian-Albrechts-University Kiel, Germany. PARTICIPANTS: 227 patients with Zenkers' diverticulum were treated by MEDCO2 and the results were compared with those reported in the literature for the open transcervical approach (OTA) and the endoscopic staple-assisted esophagodiverticulostomy (ESED)...
October 19, 2016: Clinical Otolaryngology
Julian C Harnoss, Isabelle Zelienka, Pascal Probst, Kathrin Grummich, Catharina Müller-Lantzsch, Jonathan M Harnoss, Alexis Ulrich, Markus W Büchler, Markus K Diener
OBJECTIVE: The aim was to investigate available evidence regarding effectiveness and safety of surgical versus conservative treatment of acute appendicitis. SUMMARY OF BACKGROUND DATA: There is ongoing debate on the merits of surgical and conservative treatment for acute appendicitis. METHODS: A systematic literature search (Cochrane Library, Medline, Embase) and hand search of retrieved reference lists up to January 2016 was conducted to identify randomized and nonrandomized studies...
October 17, 2016: Annals of Surgery
Mai Ohba, Tomoichiro Oka, Takayuki Ando, Saori Arahata, Asaka Ikegaya, Hirotaka Takagi, Naohisa Ogo, Chelsea Zhu, Kazuhiro Owada, Fumihiko Kawamori, Qiuhong Wang, Linda J Saif, Akira Asai
Caliciviruses are contagious pathogens of humans and various animals. They are the most common cause of viral gastroenteritis in humans, and can cause lethal diseases in domestic animals such as cats, rabbits and immunocompromised mice. In this study, we conducted cytopathic effect-based screening of 2080 selected compounds from our in-house library to find antiviral compounds against three culturable caliciviruses: feline calicivirus, murine norovirus (MNV) and porcine sapovirus (PoSaV). We identified active six compounds, of which two compounds, both related to theaflavins, showed broad antiviral activities against all three caliciviruses; three compounds (abamectin, a mixture of avermectin B1a and B1b; avermectin B1a; and (-)-epigallocatechin gallate hydrate) were effective against PoSaV only; and a heterocyclic carboxamide derivative (BFTC) specifically inhibited MNV infectivity in cell cultures...
October 19, 2016: Journal of Antibiotics
Darja Kušar, Karin Šrimpf, Petra Isaković, Lina Kalšek, Javid Hosseini, Irena Zdovc, Tina Kotnik, Modest Vengušt, Gabrijela Tavčar-Kalcher
BACKGROUND: Bacterial intercellular communication, called quorum sensing, takes place via the production and collective response to signal molecules. In Gram-negative bacteria, like Pseudomonas aeruginosa, these signaling molecules are N-acylhomoserine lactones (AHLs). P. aeruginosa is a common cause of inflammation of the ear canal (otitis externa) in dogs. It employs quorum sensing to coordinate the expression of host tissue-damaging factors, which are largely responsible for its virulence...
October 18, 2016: BMC Veterinary Research
Arianna Pompilio, Valentina Crocetta, Dipankar Ghosh, Malabika Chakrabarti, Giovanni Gherardi, Luca Agostino Vitali, Ersilia Fiscarelli, Giovanni Di Bonaventura
The present study was carried out to understand the adaptive strategies developed by Stenotrophomonas maltophilia for chronic colonization of the cystic fibrosis (CF) lung. For this purpose, 13 temporally isolated strains from a single CF patient chronically infected over a 10-year period were systematically characterized for growth rate, biofilm formation, motility, mutation frequencies, antibiotic resistance, and pathogenicity. Pulsed-field gel electrophoresis (PFGE) showed over time the presence of two distinct groups, each consisting of two different pulsotypes...
2016: Frontiers in Microbiology
M Mulet, M Gomila, A Ramírez, S Cardew, E R B Moore, J Lalucat, E García-Valdés
Fifty-two Pseudomonas strains that were difficult to identify at the species level in the phenotypic routine characterizations employed by clinical microbiology laboratories were selected for genotypic-based analysis. Species level identifications were done initially by partial sequencing of the DNA dependent RNA polymerase sub-unit D gene (rpoD). Two other gene sequences, for the small sub-unit ribosonal RNA (16S rRNA) and for DNA gyrase sub-unit B (gyrB) were added in a multilocus sequence analysis (MLSA) study to confirm the species identifications...
October 15, 2016: European Journal of Clinical Microbiology & Infectious Diseases
Soumya Swaminathan, Jotam G Pasipanodya, Geetha Ramachandran, A K Hemanth Kumar, Shashikant Srivastava, Devyani Deshpande, Eric Nuermberger, Tawanda Gumbo
BACKGROUND:  The role of drug concentrations in clinical outcomes in children with tuberculosis is unclear. Target concentrations for dose optimization are unknown. METHODS:  Plasma drug concentrations measured in Indian children with tuberculosis were modeled using compartmental pharmacokinetic analyses. The children were followed until end of therapy to ascertain therapy failure or death. An ensemble of artificial intelligence algorithms, including random forests, was used to identify predictors of clinical outcome from among 30 clinical, laboratory, and pharmacokinetic variables...
November 1, 2016: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
Leniza G De Castro-Hamoy, Mary Anne D Chiong, Sylvia C Estrada, Cynthia P Cordero
Maple syrup urine disease (MSUD) is a rare inborn error of metabolism resulting from a deficiency in the branched-chain alpha-ketoacid dehydrogenase complex. MSUD has been reported to be the most common inborn error of metabolism in the Philippines. We described all patients with maple syrup urine disease patients diagnosed through newborn screening during its first 2 years of implementation and the challenges encountered during their medical management. There were 24 patients diagnosed with maple syrup urine disease for the 2-year period...
October 6, 2016: Journal of Community Genetics
Sarah Mello, Kieran A O'Connor
In recent years, 1,200 long-term care facility (LTCF) beds have been closed in Ireland, resulting in residents being transferred between facilities. The current study examined morbidity and mortality in residents relocated between LTCFs. The outcomes were studied for residents who transferred between LTCFs compared to residents who did not move (i.e., controls). A retrospective analysis was performed recording demographic data and markers of function and frailty. As a measure of morbidity, new antidepressant medication prescriptions and antibiotic drug use were examined...
October 5, 2016: Journal of Gerontological Nursing
Inge Leonie Van 't Veer, Nadia Leloup, Alexander Egan, Bert Janssen, Nathaniel Martin, Waldemar Vollmer, Eefjan Breukink
Surface Plasmon Resonance (SPR) is one of the most powerful label free methods to determine kinetic parameters of molecular interactions in real time and in a high sensitive way. Penicillin binding proteins (PBPs) are peptidoglycan synthesis enzymes present in most bacteria. The established protocols to analyze interactions of PBPs by SPR involves immobilization to an ampicillin coated chip surface, a β-lactam antibiotic mimicking its substrate, forming a covalent complex with the PBPs transpeptidase (TP) active site...
October 6, 2016: Chembiochem: a European Journal of Chemical Biology
Zhengan Zhang, Graham A Hudson, Nilkamal Mahanta, Jonathan I Tietz, Wilfred A van der Donk, Douglas A Mitchell
The biosynthesis of the thiopeptide thiomuracin is a well-orchestrated process involving a multitude of posttranslational modifications. We show that six Cys residues of a precursor peptide are first cyclodehydrated and oxidized to thiazoles in an ordered, but non-linear fashion that is leader peptide-dependent. Then four alcohols are glutamylated and converted to alkenes in a C-to-N terminal directional process that is leader peptide-independent. Finally, two of these alkenes undergo a formal [4+2] cycloaddition to form a tri-thiazole-substituted pyridine macrocycle...
October 4, 2016: Journal of the American Chemical Society
Dinh Quoc Tuc, Moreau-Guigon Elodie, Labadie Pierre, Alliot Fabrice, Teil Marie-Jeanne, Blanchard Martine, Eurin Joelle, Chevreuil Marc
Investigation of domestic and hospital effluents in a sewage system of an elementary watershed showed that antibiotics belonging to eight classes were present with concentrations ranging from <LOQ to 50μgL(-1). The compounds most often detected in the effluents were the fluoroquinolones (79-100%), the sulfonamides (86-100%) and the macrolides (79-86%). Vancomycin, strictly reserved for hospital use in France, was detected exclusively in the hospital effluent, supporting its pertinent use as a marker of hospital discharge...
September 29, 2016: Science of the Total Environment
Temidayo D Popoola, Olufunsho Awodele, Adeola Omisanya, Nkechinyerem Obi, Chioma Umezinwa, Amos A Fatokun
ETHNOPHARMACOLOGICAL RELEVANCE: Phytochemicals with anti-oxidative and anti-inflammatory properties are known to inhibit tumour initiation, promotion and progression. Hence, there is an increasingly-convincing rationale for employing remedies containing those phytochemicals in the treatment of cancers and also as analgesic and anti-inflammatory adjuvants in therapy. The plants Garcinia kola Heckel (Clusiaceae), stem bark; Uvaria chamae P. Beauv. (Annonaceae), root; and Olax subscorpioidea Oliv...
September 26, 2016: Journal of Ethnopharmacology
Draženka Stipaničev, Zrinka Dragun, Siniša Repec, Katerina Rebok, Maja Jordanova
Target screening of 463 organic contaminants in surface water using ultra high performance liquid chromatography quadrupole time-of-flight mass spectrometry (UHPLC-QTOF-MS) with direct injection was performed in spring of 2015 in northern Macedonia, at six sampling sites in four rivers belonging to Vardar basin: Kriva, Zletovska, Bregalnica and Vardar. The aim of the study was to differentiate between various types of organic contamination characteristic for different types of anthropogenic activities, such as mining, agriculture, and urbanization...
September 26, 2016: Ecotoxicology and Environmental Safety
Manuel Kussmann, Linda Schuster, Sarah Wrenger, Petra Pichler, Gottfried Reznicek, Heinz Burgmann, Wolfgang Poeppl, Markus Zeitlinger, Martin Wiesholzer
♦ Background: Peritonitis is a major problem among patients on peritoneal dialysis (PD). The influence of diverse PD fluids on the activity of frequently used antibiotics has been insufficiently investigated. Thus, the present study set out to investigate the impact of different PD fluids on the activity of cefepime, ciprofloxacin, ertapenem, meropenem, and tobramycin against Escherichia coli. ♦ Methods: Time-kill curves in 4 different PD fluids (Dianeal PDG4, Extraneal, Nutrineal PD4 and Physioneal 40, all Baxter Healthcare Corp...
September 28, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
Carla S Andrews, Shingo Matsuyama, Byung-Cheol Lee, Jian-Dong Li
Upper respiratory tract inflammatory diseases such as asthma and chronic obstructive pulmonary diseases (COPD) affect more than one-half billion people globally and are characterized by chronic inflammation that is often exacerbated by respiratory pathogens such as nontypeable Haemophilus influenzae (NTHi). The increasing numbers of antibiotic-resistant bacterial strains and the limited success of currently available pharmaceuticals used to manage the symptoms of these diseases present an urgent need for the development of novel anti-inflammatory therapeutic agents...
September 28, 2016: Scientific Reports
Mei-Perng Lim, Mohd Firdaus-Raih, Sheila Nathan
Burkholderia pseudomallei, the causative agent of melioidosis, is among a growing number of bacterial pathogens that are increasingly antibiotic resistant. Antimicrobial peptides (AMPs) have been investigated as an alternative approach to treat microbial infections, as generally, there is a lower likelihood that a pathogen will develop resistance to AMPs. In this study, 36 candidate Caenorhabditis elegans genes that encode secreted peptides of <150 amino acids and previously shown to be overexpressed during infection by B...
2016: Frontiers in Microbiology
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