keyword
MENU ▼
Read by QxMD icon Read
search

Cefotaxime

keyword
https://www.readbyqxmd.com/read/28087769/enzyme-efficiency-but-not-thermostability-drives-cefotaxime-resistance-evolution-in-tem-1-%C3%AE-lactamase
#1
Jennifer Knies, Fei Cai, Daniel M Weinreich
A leading intellectual challenge in evolutionary genetics is to identify the specific phenotypes that drive adaptation. Enzymes offer a particularly promising opportunity to pursue this question, because many enzymes' contributions to organismal fitness depend on a comparatively small number of experimentally accessible properties. Moreover, on first principles the demands of enzyme thermostability stand in opposition to the demands of catalytic activity. This observation, coupled with the fact that enzymes are only marginally thermostable, motivates the widely held hypothesis that mutations conferring functional improvement require compensatory mutations to restore thermostability...
January 12, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28080251/tetrahedral-dna-nanoparticle-vector-for-intracellular-delivery-of-targeted-peptide-nucleic-acid-antisense-agents-to-restore-antibiotic-sensitivity-in-cefotaxime-resistant-escherichia-coli
#2
John Benedict Readman, George Dickson, Nick G Coldham
The bacterial cell wall presents a barrier to the uptake of unmodified synthetic antisense oligonucleotides, such as peptide nucleic acids, and so is one of the greatest obstacles to the development of their use as therapeutic anti-bacterial agents. Cell-penetrating peptides have been covalently attached to antisense agents, to facilitate penetration of the bacterial cell wall and deliver their cargo into the cytoplasm. Although they are an effective vector for antisense oligonucleotides, they are not specific for bacterial cells and can exhibit growth inhibitory properties at higher doses...
January 12, 2017: Nucleic Acid Therapeutics
https://www.readbyqxmd.com/read/28061869/clinical-and-microbiologic-characteristics-of-cefotaxime-non-susceptible-enterobacteriaceae-bacteremia-a-case-control-study
#3
Taro Noguchi, Yasufumi Matsumura, Masaki Yamamoto, Miki Nagao, Shunji Takakura, Satoshi Ichiyama
BACKGROUND: Cefotaxime plays an important role in the treatment of patients with bacteremia due to Enterobacteriaceae, although cefotaxime resistance is reported to be increasing in association with extended-spectrum β-lactamase (ESBL) and AmpC β-lactamase (AmpC). METHODS: We conducted a case-control study in a Japanese university hospital between 2011 and 2012. We assessed the risk factors and clinical outcomes of bacteremia due to cefotaxime-non-susceptible Enterobacteriaceae (CTXNS-En) and analyzed the resistance mechanisms...
January 7, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28061852/the-occurrence-of-esbl-producing-escherichia-coli-carrying-aminoglycoside-resistance-genes-in-urinary-tract-infections-in-saudi-arabia
#4
Essam J Alyamani, Anamil M Khiyami, Rayan Y Booq, Majed A Majrashi, Fayez S Bahwerth, Elena Rechkina
BACKGROUND: The infection and prevalence of extended-spectrum β-lactamases (ESBLs) is a worldwide problem, and the presence of ESBLs varies between countries. In this study, we investigated the occurrence of plasmid-mediated ESBL/AmpC/carbapenemase/aminoglycoside resistance gene expression in Escherichia coli using phenotypic and genotypic techniques. METHODS: A total of 58 E. coli isolates were collected from hospitals in the city of Makkah and screened for the production of ESBL/AmpC/carbapenemase/aminoglycoside resistance genes...
January 6, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28040493/characterization-of-a-novel-sgnh-type-esterase-from-lactobacillus-plantarum
#5
Yonggyu Kim, Bum Han Ryu, Jimin Kim, Wanki Yoo, Deu Rae An, Boo-Young Kim, Sena Kwon, Sojeong Lee, Ying Wang, Kyeong Kyu Kim, T Doohun Kim
Lactic acid bacteria (LAB) are sources of a large variety of microbial ester hydrolases because they can produce a wide range of short-chain esters, phenolic alcohols, and fatty acids. Here, a novel SGNH-type esterase (LpSGNH1) from Lactobacillus plantarum WCFS1 was identified, functionally characterized, and immobilized for biotechnological applications. Homologs of LpSGNH1 are also found in many lactic acid bacteria (LAB) species. Biochemical features of LpSGNH1 were investigated using mass spectrometry, gel filtration chromatography, enzyme kinetics, fluorescence, and circular dichroism (CD) spectroscopy...
December 28, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28040182/effects-of-exposure-to-quaternary-ammonium-based-biocides-on-antimicrobial-susceptibility-and-tolerance-to-physical-stresses-in-bacteria-from-organic-foods
#6
Rebeca Gadea, Miguel Ángel Fernández Fuentes, Rubén Pérez Pulido, Antonio Gálvez, Elena Ortega
In the present study, a collection of 76 biocide-sensitive bacterial strains isolated from organically produced food were adapted by repeated exposure to increasing concentrations of the quaternary ammonium compounds (QACs) benzalkonium chloride (BC) and hexadecylpyridinium chloride (HDP). The sensitivity of both wildtype strains and their corresponding QAC-adapted strains to other biocides and to antibiotics was studied. QAC tolerance increased in 88.2% of strains for BC and in 30.3% of strains for HDP, with increases in minimum inhibitory concentrations between 2 and over 100 fold...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28033162/an-ex-vivo-model-to-decipher-the-impact-of-extracorporeal-membrane-oxygenation-on-beta-lactam-degradation-kinetics
#7
Cyril Leven, Pierre Fillâtre, Antoine Petitcollin, Marie-Clémence Verdier, Jérôme Laurent, Nicolas Nesseler, Yoann Launey, Pierre Tattevin, Eric Bellissant, Erwan Flécher, Florian Lemaitre
BACKGROUND: As a consequence of drug sequestration, increase in volume of distribution or alteration of elimination, extracorporeal membrane oxygenation (ECMO) might lead to inadequate plasma concentrations of vital drugs. The aim of this experimental study was to develop an ex vivo model to better characterize the impact of ECMO procedure on beta-lactam antibiotics pharmacokinetics. METHODS: Plasma concentrations of cefotaxime, ceftazidime, cefepime, piperacillin, oxacillin, amoxicillin, and ceftriaxone were measured in an ex vivo ECMO circuit primed with whole human blood and compared to controls stored in glass tubes and polyvinyl chloride (PVC) tubing...
December 23, 2016: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/28018328/a-mechanism-of-synergistic-effect-of-streptomycin-and-cefotaxime-on-ctx-m-15-type-%C3%AE-lactamase-producing-strain-of-e-cloacae-a-first-report
#8
Lubna Maryam, Asad U Khan
A blaCTX-M-15 gene is one of the most prevalent resistant marker found in member of enterobacteriaceae. It encodes cefotaxime hydrolysing β-lactamase-15 (CTX-M-15) causing resistance against beta lactam antibiotics. Since single antibiotic therapy fails to control infection caused by multidrug resistance strain, therefore combination therapy was came into practice as an effective treatment. We have first time explained the mechanism where two antibiotics of different classes work against resistant strains...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28013185/wild-small-mammals-as-sentinels-for-the-environmental-transmission-of-antimicrobial-resistance
#9
Lauren E Furness, Amy Campbell, Lihong Zhang, William H Gaze, Robbie A McDonald
Antimicrobial resistance (AMR) represents a serious threat to human health worldwide. We have tested the use of free-living small mammals (mice, voles and shrews) as sentinels of variation in the distribution of AMR in the environment and the potential for transmission from the natural environment to animal hosts. Escherichia coli isolated from the faeces of small mammals trapped at paired coastal and inland sites were tested for resistance to four antibiotics: trimethoprim, ampicillin, ciprofloxacin and cefotaxime...
December 22, 2016: Environmental Research
https://www.readbyqxmd.com/read/28011210/synergistic-antibacterial-effect-of-bi2s3-nanospheres-combined-with-ineffective-antibiotic-gentamicin-against-methicillin-resistant-staphylococcus-aureus
#10
Lulu Ma, Jie Wu, Shilei Wang, Hao Yang, Donghui Liang, Zhong Lu
In this paper, Bi2S3 nanospheres with size of 212nm were prepared by a simple hydrothermal process. The selectively enhanced antibacterial effects of Bi2S3 nanospheres with three classes of ineffective antibiotics, β-lactam (cefuroxime, CXM; cefotaxime, CTX and piperacillin, PIP), quinolone (ciprofloxacin, CIP) and aminoglycoside (gentamicin, GEN) against clinical isolated methicillin-resistant Staphylococcus aureus (MRSA) were investigated for the first time. GEN shows significantly synergistic growth inhibition against MRSA when combined with Bi2S3 nanospheres, while CXM, CTX, PIP and CIP do not...
December 10, 2016: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28009105/prevalence-and-antimicrobial-resistance-of-salmonella-enterica-serovar-indiana-in-china-1984-2016
#11
REVIEW
J Gong, P Kelly, C Wang
Salmonella enterica serovar Indiana, first described in 1955, is generally regarded as having a low frequency worldwide with outbreaks of gastroenteritis and abortions described in North America and Europe. In China, S. Indiana was first reported in 1984 and in the subsequent 71 surveys in 35 cities/municipalities from 18 provinces, 70% of which were after 2012, S. Indiana has been shown to have become widely prevalent in people, animals, food and the environment around abattoirs and meat processing facilities...
December 23, 2016: Zoonoses and Public Health
https://www.readbyqxmd.com/read/28000028/demonstration-of-the-herd-effect-in-adults-after-the-implementation-of-pneumococcal-vaccination-with-pcv13-in-children
#12
C Hays, Q Vermee, A Agathine, A Dupuis, E Varon, C Poyart, M-C Ploy, J Raymond
The purpose of this investigation was to describe the evolution of serotypes and antibiotic susceptibility of Streptococcus pneumoniae strains isolated from both adults and children from the same population area with invasive pneumococcal disease (IPD) or acute otitis media (AOM), 5 years after the introduction of the 13-valent pneumococcal conjugate vaccine (PCV13). From 2009 to 2015, 839 strains of S. pneumoniae strains were collected (481 from adults and 358 from children). Serotyping by latex antisera and molecular methods was performed...
December 20, 2016: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/27999046/rapid-eucast-disc-diffusion-testing-of-mdr-escherichia-coli-and-klebsiella-pneumoniae-inhibition-zones-for-extended-spectrum-cephalosporins-can-be-reliably-read-after-6%C3%A2-h-of-incubation
#13
Inga Fröding, Martin Vondracek, Christian G Giske
OBJECTIVES: The need for rapid antibiotic susceptibility testing increases with escalating levels of antimicrobial resistance in Enterobacteriaceae. Our objective was to evaluate the accuracy of reading EUCAST disc diffusion, ROSCO ESBL and carbapenemase detection kits and the Mast Carbapenemase Activity Test (CAT-ID) disc, after 6 h of incubation. METHODS: We used a collection of 128 isolates of Escherichia coli and Klebsiella pneumoniae with a wide variety of resistance mechanisms...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27999029/epidemiology-and-susceptibility-to-antimicrobial-agents-of-the-main-nocardia-species-in-spain
#14
Sylvia Valdezate, Noelia Garrido, Gema Carrasco, María J Medina-Pascual, Pilar Villalón, Ana M Navarro, Juan A Saéz-Nieto
OBJECTIVES: The aims of this study were to explore the clinical distribution, by species, of the genus Nocardia and to assess the antimicrobial susceptibilities of the 10 most prevalent species identified in Spain. METHODS: Over a 10 year period (2005-14), 1119 Nocardia strains were molecularly identified and subjected to the Etest. The distribution and resistance trends over the sub-periods 2005-09 and 2010-14 were also examined. RESULTS: Of the strains examined, 82...
December 20, 2016: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/27992527/first-report-of-group-ctx-m-9-extended-spectrum-beta-lactamases-in-escherichia-coli-isolates-from-pediatric-patients-in-mexico
#15
Jocelin Merida-Vieyra, Agustin De Colsa, Yair Calderon Castañeda, Patricia Arzate Barbosa, Alejandra Aquino Andrade
The aim of this study was to identify the presence of group CTX-M-9 extended spectrum beta-lactamases (ESBL) in clinical Escherichia coli isolates from pediatric patients. A total of 404 non-repeated positive ESBL E. coli isolates were collected from documented clinical infections in pediatric patients over a 2-year period. The identification and susceptibility profiles were determined using an automated system. Isolates that suggested ESBL production based on their resistance profiles to third and fourth generation cephalosporin and monobactam were selected...
2016: PloS One
https://www.readbyqxmd.com/read/27986632/structural-insight-into-mode-of-binding-of-meropenem-to-ctx-m-15-type-%C3%AE-lactamase
#16
Lubna Maryam, Asad U Khan
Among Enterobacteriaceae, CTX-M type extended spectrum beta lactamase confers potent hydrolytic activity against cephalosporin group of antibiotics. Strains producing CTX-M type beta lactamase enzymes, show high level of resistance against cefotaxime. Therefore carbapenem antibiotics are used against beta lactamase producing strains. Hence, this study was designed to understand an insight of molecular basis of CTX-M-15 interaction with meropenem, and its effect on CTX-M-15 efficiency. Clinical strain of Enterobacter cloacae (EC-15) was used to clone blaCTX-M-15 gene in E...
December 14, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27965626/high-prevalence-of-gut-microbiota-colonization-with-broad-spectrum-cephalosporin-resistant-enterobacteriaceae-in-a-tunisian-intensive-care-unit
#17
Elaa Maamar, Sana Ferjani, Ali Jendoubi, Samia Hammami, Zaineb Hamzaoui, Laure Mayonnove-Coulange, Mabrouka Saidani, Aouatef Kammoun, Amel Rehaiem, Salma Ghedira, Mohamed Houissa, Ilhem Boutiba-Ben Boubaker, Amine Slim, Veronique Dubois
Healthcare-associated infections due to cefotaxime-resistant (CTX-R) Enterobacteriaceae have become a major public health threat, especially in intensive care units (ICUs). Often acquired nosocomially, CTX-R Enterobacteriaceae can be introduced initially by patients at admission. This study aimed to determine the prevalence and genetic characteristics of CTX-R Enterobacteriaceae-intestinal carriage in ICU patients, to evaluate the rate of acquisition of these organisms during hospitalization, and to explore some of the associated risk factors for both carriage and acquisition...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27964935/molecular-and-in-silico-analysis-of-a-new-plasmid-mediated-ampc-%C3%AE-lactamase-cmh-2-in-clinical-isolates-of-klebsiella-pneumoniae
#18
Birson Ingti, Monjur Ahmed Laskar, Sudip Choudhury, Anand Prakash Maurya, Deepjyoti Paul, Anupam Das Talukdar, Manabendra Dutta Choudhury, Debadatta Dhar, Atanu Chakravarty, Amitabha Bhattacharjee
Two Klebsiella strains isolated from urine samples were positive for blaAmpC by PCR and showed sequence similarity with CMH-1 (98.6%) after sequencing. It also shares 82% similarity with ACT-1, 85% with MIR-1 and 81% with the chromosomal AmpC gene of Enterobacter cloacae. This gene was associated with the plasmid of IncK type. It has an open reading frame of 381 amino acid with four amino acid substitutions at position D144A, C189R, Q192E, and A195T as compared to CMH-1. When expressed in E.coli DH5α and E...
December 10, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27959883/antibiotic-susceptibility-of-legionella-strains-isolated-from-public-water-sources-in-macau-and-guangzhou
#19
Lina Xiong, He Yan, Lei Shi, Ziyao Mo
The purpose of this study was to investigate the susceptibility of waterborne strains of Legionella to eight antimicrobials commonly used in legionellosis therapy. The minimum inhibitory concentrations (MICs) of 66 environmental Legionella strains, isolated from fountains and cooling towers of public facilities (hotels, schools, and shopping malls) in Macau and Guangzhou, were tested using the microdilution method in buffered yeast extract broth. The MIC50/MIC90 values for erythromycin, cefotaxime (CTX), doxycycline (DOC), minocycline (MIN), azithromycin, ciprofloxacin, levofloxacin (LEV), and moxifloxacin were 0...
December 2016: Journal of Water and Health
https://www.readbyqxmd.com/read/27956425/cephem-potentiation-by-inactivation-of-non-essential-genes-involved-in-cell-wall-biogenesis-of-%C3%AE-lactamase-producing-escherichia-coli
#20
Kristin R Baker, Helga Høeg Sigurðardóttir, Bimal Jana, Luca Guardabassi
Reversal of antimicrobial resistance is an appealing and largely unexplored strategy in drug discovery. The objective of this study was to identify potential targets for "helper" drugs reversing cephem resistance in Escherichia coli producing β-lactamases. A CMY-2-encoding plasmid was transferred by conjugation to seven isogenic deletion mutants exhibiting cephem hyper-susceptibility. The effect of each mutation was evaluated by comparing the MICs in the wild type and the mutant harboring the same plasmid...
December 12, 2016: Antimicrobial Agents and Chemotherapy
keyword
keyword
24285
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"