keyword
MENU ▼
Read by QxMD icon Read
search

b lactamics

keyword
https://www.readbyqxmd.com/read/28329088/short-course-adjunctive-gentamicin-as-empirical-therapy-in-patients-with-severe-sepsis-and-septic-shock-a-prospective-observational-cohort-study
#1
David S Y Ong, Jos F Frencken, Peter M C Klein Klouwenberg, Nicole Juffermans, Tom van der Poll, Marc Bonten, Olaf Cremer
Background.: Meta-analyses failed to demonstrate clinical benefits of beta lactam plus aminoglycoside combination therapy, compared to beta lactam monotherapy, in patients with sepsis. However, few data exist on the effects of short-course adjunctive aminoglycoside therapy in sepsis patients with organ failure or shock. Methods.: We prospectively enrolled consecutive patients with severe sepsis or septic shock in two intensive care units in the Netherlands from 2011 to 2015...
February 28, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28318702/antibiotic-associated-diarrhea-clinical-characteristics-and-the-presence-of-clostridium-difficile
#2
A Rodríguez-Varón, O M Muñoz, J Pulido-Arenas, S B Amado, M Tobón-Trujillo
INTRODUCTION AND AIMS: Evidence in Colombia and Latin America has been insufficient for establishing the clinical characteristics of patients with antibiotic-associated diarrhea (AAD). The present study attempts to describe the clinical characteristics of patients with AAD and to determine the presence of Clostridium difficile, utilizing the polymerase chain reaction (PCR) technique. MATERIALS AND METHODS: Forty-three patients with AAD, managed at the Hospital Universitario San Ignacio in Bogota, Colombia, were evaluated...
March 15, 2017: Revista de Gastroenterología de México
https://www.readbyqxmd.com/read/28295617/carbapenemases-producing-klebsiella-pneumoniae-in-hospitals-of-two-regions-of-southern-italy
#3
Carla Calia, Carlo Pazzani, Marta Oliva, Maria Scrascia, Piero Lovreglio, Carmen Capolongo, Anna Maria Dionisi, Adriana Chiarelli, Rosa Monno
Carbapenem-resistant Klebsiella pneumoniae infections are reported with increasing frequency elsewhere in the world, representing a worrying phenomenon for global health. In Italy, there are hotspot data on the diffusion and type of carbapenemase-producing Enterobacteriaceae and K. pneumoniae in particular, with very few data coming from Apulia and Basilicata, two regions of Southern Italy. This study was aimed at characterizing by phenotypic and genotypic methods carbapenem-resistant K. pneumoniae isolated from several Hospitals of Apulia and Basilicata, Southern Italy...
March 15, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28293036/naphthacemycins-novel-circumventors-of-%C3%AE-lactam-resistance-in-mrsa-produced-by-streptomyces-sp-kb-3346-5-ii-structure-elucidation
#4
Atsushi Fukumoto, Yong-Pil Kim, Masato Iwatsuki, Tomoyasu Hirose, Toshiaki Sunazuka, Hideaki Hanaki, Satoshi Ōmura, Kazuro Shiomi
Seventeen new compounds, naphthacemycins A1-A11, B1-B4 and C1-C2, were isolated from a cultured broth of Streptomyces sp. KB-3346-5 during screening for circumventors of β-lactam resistance in methicillin-resistant Staphylococcus aureus. Their structures were elucidated by spectroscopic studies, including NMR and X-ray crystallographic analysis. The naphthacemycin A series has a new skeleton displaying a 7-phenylnaphthacene-5,6,11(12H)-trione. In contrast, the quinone moiety of the A series is changed to dehydroxyquinol in the B series and to a semiquinone-like structure in the C series...
March 15, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28288581/prevalence-virulence-factor-genes-and-antibiotic-resistance-of-bacillus-cereus-sensu-lato-isolated-from-dairy-farms-and-traditional-dairy-products
#5
James Owusu-Kwarteng, Alhassan Wuni, Fortune Akabanda, Kwaku Tano-Debrah, Lene Jespersen
BACKGROUND: B. cereus are of particular interest in food safety and public health because of their capacity to cause food spoilage and disease through the production of various toxins. The aim of this study was to determine the prevalence, virulence factor genes and antibiotic resistance profile of B. cereus sensu lato isolated from cattle grazing soils and dairy products in Ghana. A total of 114 samples made up of 25 soil collected from cattle grazing farm land, 30 raw milk, 28 nunu (yoghurt-like product) and 31 woagashie (West African soft cheese)...
March 14, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28270082/%C3%AE-lactam-structured-4-4-methylsulfonyl-phenyl-1-pentyl-3-phenoxyazetidin-2-one-selectively-targets-cancerous-b-lymphocyte-mitochondria
#6
Nahal Pirahmadi, Afshin Zarghi, Ahmad Salimi, Hadi Arefi, Jalal Pourahmad
β lactam-structured Cox-2 inhibitors, possesses anti-proliferative and anti-inflammatory effects. In this research, the actions of a synthetic β lactam-structured Cox-2 inhibitor with 4-(4- (Methylsulfonyl)phenyl)-1-pentyl-3-phenoxyazetidin-2-one on cellular viability of cancerous lymphoblast obtained from patients with acute lymphocytic leukemia (ALL) and normal lymphocytes obtained from healthy donors were compared.%the cell viability of cancerouslymphoblasts and normal lymphocytes treated with β lactam derivatives were assayed with MTT test...
February 13, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28264560/overcoming-an-extreme-drug-resistant-xdr-pathogen-avibactam-restores-susceptibility-to-ceftazidime-for-burkholderia-cepacia-complex-isolates-from-cystic-fibrosis-patients
#7
Krisztina M Papp-Wallace, Scott A Becka, Elise T Zeiser, Nozumi Ohuchi, Maria F Mojica, Julian A Gatta, Monica Falleni, Delfina Tosi, Elisa Borghi, Marisa L Winkler, Brigid M Wilson, John J LiPuma, Michiyoshi Nukaga, Robert A Bonomo
Burkholderia multivorans is a significant health threat to persons with cystic fibrosis (CF). Infections are difficult to treat as this pathogen is inherently resistant to multiple antibiotics. Susceptibility testing of isolates obtained from CF respiratory cultures revealed that single agents selected from different antibiotic classes were unable to inhibit growth. However, all isolates were found to be susceptible to ceftazidime when combined with the novel non-β-lactam β-lactamase inhibitor, avibactam (all minimum inhibitor concentrations (MICs) were ≤ 8 mg/L of ceftazidime and 4 mg/L of avibactam)...
March 6, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28257899/short-read-whole-genome-sequencing-for-determination-of-antimicrobial-resistance-mechanisms-and-capsular-serotypes-of-current-invasive-streptococcus-agalactiae-recovered-in-the-united-states
#8
Benjamin J Metcalf, Sopio Chochua, Robert E Gertz, Paulina A Hawkins, Jessica Ricaldi, Zhongya Li, Hollis Walker, Theresa Tran, Joy Rivers, Saundra Mathis, Delois Jackson, Anita Glennen, Ruth Lynfield, Lesley McGee, Bernard Beall
OBJECTIVES: Our objective was to evaluate and exploit a whole genome sequence (WGS) bioinformatics pipeline for predicting antimicrobial resistance and capsular serotypes from invasive group B streptococci (iGBS). METHODS: For 1975 iGBS recovered during 2015 from CDC's Active Bacterial Core surveillance, we compared pipeline predictions to broth dilution testing. Fifty-six isolates from earlier surveillance were included for testing β-lactams.. Conventional serotyping was compared to WGS-based assignments for 302 isolates...
February 28, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28254699/%C3%AE-lactam-analogues-of-combretastatin-a-4-prevent-metabolic-inactivation-by-glucuronidation-in-chemoresistant-ht-29-colon-cancer-cells
#9
Azizah M Malebari, Lisa M Greene, Seema M Nathwani, Darren Fayne, Niamh M O'Boyle, Shu Wang, Brendan Twamley, Daniela M Zisterer, Mary J Meegan
Glucuronidation by uridine 5-diphosphoglucuronosyl transferase enzymes (UGTs) is a cause of intrinsic drug resistance in cancer cells. Glucuronidation of combretastatin A-4 (CA-4) was previously identified as a mechanism of resistance in hepatocellular cancer cells. Herein, we propose chemical manipulation of β-lactam bridged analogues of Combretastatin A-4 as a novel means of overcoming drug resistance associated with glucuronidation due to the expression of UGTs in the CA-4 resistant human colon cancer HT-29 cells...
April 21, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28251179/fluorocycline-tp-271-is-potent-against-complicated-community-acquired-bacterial-pneumonia-pathogens
#10
Trudy H Grossman, Corey Fyfe, William O'Brien, Meredith Hackel, Mary Beth Minyard, Ken B Waites, Jacques Dubois, Timothy M Murphy, Andrew M Slee, William J Weiss, Joyce A Sutcliffe
TP-271 is a novel, fully synthetic fluorocycline antibiotic in clinical development for the treatment of respiratory infections caused by susceptible and multidrug-resistant pathogens. TP-271 was active in MIC assays against key community respiratory Gram-positive and Gram-negative pathogens, including Streptococcus pneumoniae (MIC90 = 0.03 µg/ml), methicillin-sensitive Staphylococcus aureus (MSSA; MIC90 = 0.25 µg/ml), methicillin-resistant S. aureus (MRSA; MIC90 = 0.12 µg/ml), Streptococcus pyogenes (MIC90 = 0...
January 2017: MSphere
https://www.readbyqxmd.com/read/28247991/the-discovery-of-2-aminobenzimidazoles-that-sensitize-mycobacterium-smegmatis-and-m-%C3%A2-tuberculosis-to-%C3%AE-lactam-antibiotics-in-a-pattern-distinct-from-%C3%AE-lactamase-inhibitors
#11
T Vu Nguyen, Meghan S Blackledge, Erick A Lindsey, Bradley M Minrovic, David F Ackart, Albert B Jeon, Andrés Obregón-Henao, Roberta J Melander, Randall J Basaraba, Christian Melander
A library of 2-aminobenzimidazole derivatives was screened for the ability to suppress β-lactam resistance in Mycobacterium smegmatis. Several non-bactericidal compounds were identified that reversed intrinsic resistance to β-lactam antibiotics in a manner distinct from β-lactamase inhibitors. Activity also translates to M. tuberculosis, with a lead compound from this study potently suppressing carbenicillin resistance in multiple M. tuberculosis strains (including multidrug-resistant strains). Preliminary mechanistic studies revealed that the lead compounds act through a mechanism distinct from that of traditional β-lactamase inhibitors...
March 1, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28245965/prevalence-serotyping-and-antimicrobials-resistance-mechanism-of-salmonella-enterica-isolated-from-clinical-and-environmental-samples-in-saudi-arabia
#12
Mohamed A El-Tayeb, Abdelnasser S S Ibrahim, Ali A Al-Salamah, Khalid S Almaary, Yahya B Elbadawi
Salmonella is recognized as a common foodborne pathogen, causing major health problems in Saudi Arabia. Herein, we report epidemiology, antimicrobial susceptibility and the genetic basis of resistance among S. enterica strains isolated in Saudi Arabia. Isolation of Salmonella spp. from clinical and environmental samples resulted in isolation of 33 strains identified as S. enterica based on their biochemical characteristics and 16S-rDNA sequences. S. enterica serovar Enteritidis showed highest prevalence (39...
February 14, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28231526/enhanced-identification-of-%C3%AE-lactamases-and-its-classes-using-sequence-physicochemical-and-evolutionary-information-with-sequence-feature-characterization-of-the-classes
#13
Abhigyan Nath, S Karthikeyan
β-lactamases provides one of the most successful means of evading the therapeutic effects of β lactam class of antibiotics by many gram positive and gram negative bacteria. On the basis of sequence identity, β-lactamases have been identified into four distinct classes- A, B, C and D. The classes A, C and D are the serine β-lactamases and class B is the metallo-lactamse. In the present study, we developed a two stage cascade classification system. The first-stage performs the classification of β-lactamases from non-β-lactamases and the second-stage performs the further classification of β-lactamases into four different β-lactamase classes...
February 14, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/28225277/daryamide-analogues-from-a-marine-derived-streptomyces-species
#14
Peng Fu, Scott La, John B MacMillan
Three new cyclohexene amine derivatives, daryamides D-F (1-3), a new arylamine derivative, carpatamide D (4), and a new ornithine lactamization derivative, ornilactam A (5), were isolated from the marine-derived Streptomyces strain SNE-011. Their structures, including absolute configurations, were elucidated on the basis of spectroscopic analysis and chemical methods. The carpatamide skeleton could be considered as the biosynthetic precursor of the daryamides.
February 22, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28220736/antibiotic-prescription-patterns-of-south-african-general-medical-practitioners-for-treatment-of-acute-bronchitis
#15
N B Q Ncube, G C Solanki, T Kredo, R Lalloo
BACKGROUND: Antibiotic resistance is a significant public health problem. Prudent use of antibiotics is crucial in reducing this resistance. Acute bronchitis is a common reason for consultations with general medical practitioners, and antibiotics are often prescribed even though guidelines recommend not prescribing them for uncomplicated acute bronchitis. OBJECTIVE: To analyse the antibiotic prescription patterns of South African (SA) general medical practitioners in the treatment of acute bronchitis...
January 30, 2017: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/28219704/%C3%AE-lactam-hypersensitivity-involves-expansion-of-circulating-and-skin-resident-th22-cells
#16
Andrew Sullivan, Eryi Wang, John Farrell, Paul Whitaker, Lee Faulkner, Daniel Peckham, B Kevin Park, Dean J Naisbitt
BACKGROUND: β-lactam hypersensitivity has been classified according to the phenotype and function of drug-specific T-cells; however, new T-cell subsets have not been considered. OBJECTIVE: The objective of this study was use piperacillin as a model of β-lactam hypersensitivity to study the nature of the drug-specific T-cell response induced in the blood and skin of hypersensitive patients and healthy volunteers. METHODS: Drug-specific T-cells were cloned from blood and inflamed skin and cellular phenotype and function was explored...
February 17, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28208282/general-sensitive-detecting-strategy-of-ions-through-plasmonic-resonance-energy-transfer-from-gold-nanoparticles-to-rhodamine-spirolactam
#17
Ming Xuan Gao, Hong Yan Zou, Yuan Fang Li, Cheng Zhi Huang
Plasmonic resonance energy transfer (PRET), which occurs between the plasmonic nanoparticles and organic dyes, has significant potential in target sensing chemistry owing to its sensitivity at the single nanoparticle level. In this contribution, by using AuNPs, which has localized surface plasmonic resonance light scattering (LSPR-LS) around 550 nm, as the donor of PRET, a general sensitive detecting strategy of ions were developed. Targets can specifically react with a ring-close structured rhodamine spirolactam, which was prepared from rhodamines in the presence of different primary amine wherein the option of the primary amine is up to the targets, forming ring-open structured rhodamine spirolactam with the strong absorption around 550 nm...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207813/interacting-networks-of-resistance-virulence-and-core-machinery-genes-identified-by-genome-wide-epistasis-analysis
#18
Marcin J Skwark, Nicholas J Croucher, Santeri Puranen, Claire Chewapreecha, Maiju Pesonen, Ying Ying Xu, Paul Turner, Simon R Harris, Stephen B Beres, James M Musser, Julian Parkhill, Stephen D Bentley, Erik Aurell, Jukka Corander
Recent advances in the scale and diversity of population genomic datasets for bacteria now provide the potential for genome-wide patterns of co-evolution to be studied at the resolution of individual bases. Here we describe a new statistical method, genomeDCA, which uses recent advances in computational structural biology to identify the polymorphic loci under the strongest co-evolutionary pressures. We apply genomeDCA to two large population data sets representing the major human pathogens Streptococcus pneumoniae (pneumococcus) and Streptococcus pyogenes (group A Streptococcus)...
February 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28197321/discovery-of-novel-allosteric-hcv-ns5b-inhibitors-2-lactam-containing-thiophene-carboxylates
#19
Pan Li, Warren Dorsch, David J Lauffer, Darius Bilimoria, Nathalie Chauret, John J Court, Sanjoy Kumar Das, Francois Denis, Nagraj Mani, Suganthini Nanthakumar, Olivier Nicolas, B Govinda Rao, Steven Ronkin, Subajini Selliah, Rebecca S Shawgo, Ralph Stearns, Qing Tang, Nathan D Waal, Jeremy Green
Lomibuvir (1) is a non-nucleoside, allosteric inhibitor of the hepatitis C virus NS5B polymerase with demonstrated clinical efficacy. Further development efforts within this class of inhibitor focused on improving the antiviral activity and physicochemical and pharmacokinetic properties. Recently, we reported the development of this series, leading to compound 2, a molecule with comparable potency and an improved physicochemical profile relative to 1. Further exploration of the amino amide-derived side chain led to a series of lactam derivatives, inspired by the X-ray crystal structure of related thiophene carboxylate inhibitors...
February 9, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28194411/antibiotic-resistance-of-campylobacter-recovered-from-faeces-and-carcasses-of-healthy-livestock
#20
Akosua B Karikari, Kwasi Obiri-Danso, Enoch H Frimpong, Karen A Krogfelt
Campylobacter is of major significance in food safety and human and veterinary medicine. This study highlighted resistance situation in the area of veterinary public health in Ghana. Using selective mCCDA agar, isolates were confirmed phenotypically on API CAMPY and genotypically by multiplex PCR of IpxA gene. The susceptibility profile of species to common and relevant antibiotics was determined by the Kirby-Bauer disk diffusion method. Cattle, sheep, goat, and pig faecal samples analysed, respectively, yielded 13...
2017: BioMed Research International
keyword
keyword
108532
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"