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https://www.readbyqxmd.com/read/29023124/synthesis-and-antimicrobial-evaluation-of-fire-ant-venom-alkaloid-based-2-methyl-6-alkyl-%C3%AE-1-6-piperideines
#1
Yujie Yan, Yu An, Xiaozhong Wang, Yingqi Chen, Melissa R Jacob, Babu L Tekwani, Liyan Dai, Xing-Cong Li
The first synthesis of 2-methyl-6-pentadecyl-Δ(1,6)-piperideine (1), a major alkaloid of the piperideine chemotype in fire ant venoms, and its analogues, 2-methyl-6-tetradecyl-Δ(1,6)-piperideine (2) and 2-methyl-6-hexadecyl-Δ(1,6)-piperideine (3), was achieved by a facile synthetic method starting with glutaric acid (4) and urea (5). Compound 1 showed in vitro antifungal activity against Cryptococcus neoformans and Candida albicans with IC50 values of 6.6 and 12.4 μg/mL, respectively, and antibacterial activity against vancomycin-resistant Enterococcus faecium with an IC50 value of 19...
October 12, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/29018422/novel-aggregation-promoting-factor-agge-contributes-to-the-probiotic-properties-of-enterococcus-faecium-bggo9-28
#2
Katarina Veljović, Nikola Popović, Marija Miljković, Maja Tolinački, Amarela Terzić-Vidojević, Milan Kojić
The understanding of mechanisms of interactions between various bacterial cell surface proteins and host receptors has become imperative for the study of the health promoting features of probiotic enterococci. This study, for the first time, describes a novel enterococcal aggregation protein, AggE, from Enterococcus faecium BGGO9-28, selected from a laboratory collection of enterococcal isolates with auto-aggregation phenotypes. Among them, En. faecium BGGO9-28 showed the strongest auto-aggregation, adhesion to components of ECM and biofilm formation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28994635/does-isolation-of-enterococcus-affect-outcomes-in-intra-abdominal-infections
#3
James M Sanders, Jeffrey M Tessier, Robert Sawyer, E P Dellinger, Preston R Miller, Nicholas Namias, Michaela West, Charles H Cook, P J O'Neill, Lena Napolitano, Rishi Rattan, Joseph Cuschieri, Jeffrey A Claridge, Chris A Guidry, Reza Askari, Kaysie Banton, Ori Rotstein, Billy J Moore, Therese M Duane
BACKGROUND: Enterococci are isolated frequently as pathogens in patients with intra-abdominal infections (IAIs) and may predict poor clinical outcomes. It remains controversial whether enterococci warrant an altered treatment approach with regard to antimicrobial treatment. PATIENTS AND METHODS: The study population was derived from the Study to Optimize Peritoneal Infection Therapy (STOP-IT) trial database. Through post hoc analysis subjects were stratified into two groups based on isolation of Enterococcus...
October 10, 2017: Surgical Infections
https://www.readbyqxmd.com/read/28992026/amino-acid-and-phosphorus-digestibility-of-fermented-corn-soybean-meal-mixed-feed-with-bacillus-subtilis-and-enterococcus-faecium-fed-to-pigs
#4
C Shi, Y Zhang, Y Yin, C Wang, Z Lu, F Wang, J Feng, Y Wang
In the present study, a 2-stage solid-state fermentation process using followed by was performed with the purpose of improving the nutritional quality of corn and soybean meal (SBM) mixed feed (MF). The matrix of native MF and fermented MF (FMF) was analyzed using scanning electron microscopy to determine external structures after solid-state fermentation. Results of the present study indicated that the FMF had a greater concentration of CP and total P compared with the unfermented feed, whereas the contents of β-conglycinin, glycinin, phytate P, raffinose, stachyose, and NDF in FMF declined by 77...
September 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28990822/identification-of-structural-and-immunity-genes-of-a-class-iib-bacteriocin-encoded-in-the-enterocin-a-operon-of-enterococcus-faecium-strain-mxvk29
#5
E E Escamilla-Martínez, Y M Álvarez Cisneros, F J Fernández, M Quirasco-Baruch, E Ponce-Alquicira
The Enterococcus faecium strain MXVK29, isolated from fermented sausages, produces a bacteriocin with a molecular mass of 3.5 kDa that belongs to the class of enterocins II.1, according to the terminal amino acid sequence, and has been identified as enterocin A. This bacteriocin is active against selected strains of Listeria, Staphylococcus, Pediococcus, and Enterococcus. In this study, we identified the genes adjacent to the structural gene for this bacteriocin, such as the immunity gene (entI) and the inducer gene (entF)...
October 9, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28983096/chlorinated-emodin-as-a-natural-antibacterial-agent-against-drug-resistant-bacteria-through-dual-influence-on-bacterial-cell-membranes-and-dna
#6
Feixia Duan, Guang Xin, Hai Niu, Wen Huang
The rise in infections caused by drug-resistant pathogens and a lack of effective medicines requires the discovery of new antibacterial agents. Naturally chlorinated emodin 1,3,8-trihydroxy-4-chloro-6-methyl-anthraquinone (CE) from fungi and lichens was found to markedly inhibit the growth of Gram-positive bacteria, especially common drug-resistant bacterial strains, including methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus faecium (VRE). CE was confirmed to cause significant potassium leakage, cell membrane depolarization and damage to the selective permeability of cell membranes in bacterial cells, resulting in bacterial cell death...
October 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28980499/the-occurrence-of-enterococcus-faecium-and-faecalis-is-significantly-associated-with-anastomotic-leakage-after-pancreaticoduodenectomy
#7
M Belmouhand, P S Krohn, L B Svendsen, A Henriksen, C P Hansen, M P Achiam
BACKGROUND AND AIMS: Enterococcus has emerged as a virulent species; Enterococcus faecium especially has arisen as a source of nosocomial infections. Furthermore, specific Enterococcus faecalis species are significantly associated with anastomotic leakage in rodent studies. The objective of this study was to investigate whether the occurrence of Enterococci ( E. faecium and E. faecalis) obtained from drain samples was associated with leakage in humans undergoing pancreaticoduodenectomy...
October 1, 2017: Scandinavian Journal of Surgery: SJS
https://www.readbyqxmd.com/read/28969155/linezolid-and-vancomycin-resistant-enterococci-a-therapeutic-problem
#8
Garima Yadav, Bhaskar Thakuria, Molly Madan, Vivek Agwan, Anita Pandey
INTRODUCTION: Enterococci are recognized as opportunistic pathogens, as well as commensals in both humans and animals. They are an important cause of nosocomial infections, difficult to treat, as the organism have intrinsic and acquired resistance to many antibiotics. AIM: To isolate and identify clinically relevant Enterococcus up to species level from all the clinical samples processed in the microbiology laboratory and also to study their resistance pattern. MATERIALS AND METHODS: A prospective study was carried out for a period of one year from May 2014 to April 2015 at the Department of Microbiology, Subharti Medical College, Meerut, Uttar Pradesh, India...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28961986/novel-multiresistance-cfr-plasmids-in-linezolid-resistant-methicillin-resistant-staphylococcus-epidermidis-and-vancomycin-resistant-enterococcus-faecium-vre-from-a-hospital-outbreak-co-location-of-cfr-and-optra-in-vre
#9
Alexandros Lazaris, David C Coleman, Angela M Kearns, Bruno Pichon, Peter M Kinnevey, Megan R Earls, Breida Boyle, Brian O'Connell, Gráinne I Brennan, Anna C Shore
Background: Linezolid is often the drug of last resort to treat infections caused by Gram-positive cocci. Linezolid resistance can be mutational (23S rRNA or L-protein) or, less commonly, acquired [predominantly cfr , conferring resistance to phenicols, lincosamides, oxazolidinones, pleuromutilins and streptogramin A compounds (PhLOPS A ) or optrA , encoding oxazolidinone and phenicol resistance]. Objectives: To investigate the clonality and genetic basis of linezolid resistance in 13 linezolid-resistant (LZDR) methicillin-resistant Staphylococcus epidermidis (MRSE) isolates recovered during a 2013/14 outbreak in an ICU in an Irish hospital and an LZDR vancomycin-resistant Enterococcus faecium (VRE) isolate from an LZDR-MRSE-positive patient...
August 28, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28961701/zaaps-program-results-for-2015-an-activity-and-spectrum-analysis-of-linezolid-using-clinical-isolates-from-medical-centres-in-32-countries
#10
Michael A Pfaller, Rodrigo E Mendes, Jennifer M Streit, Patricia A Hogan, Robert K Flamm
Objectives: To report the linezolid in vitro activity obtained during the 2015 ZAAPS Program. Methods: In total, 7587 organisms causing documented infections were consecutively collected in 65 centres in 32 ex-USA countries. Broth microdilution susceptibility testing was performed. Isolates displaying linezolid MIC results of ≥ 4 mg/L were molecularly characterized. Results: Linezolid inhibited >99.9% of Staphylococcus aureus at ≤ 2 mg/L, with MIC 50 results of 1 mg/L, regardless of methicillin resistance...
July 25, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28960264/clinical-impact-of-colonization-with-multidrug-resistant-organisms-on-outcome-after-allogeneic-stem-cell-transplantation-in-patients-with-acute-myeloid-leukemia
#11
Sebastian Scheich, Sarah Lindner, Rosalie Koenig, Claudia Reinheimer, Thomas A Wichelhaus, Michael Hogardt, Silke Besier, Volkhard A J Kempf, Johanna Kessel, Hans Martin, Anne C Wilke, Hubert Serve, Gesine Bug, Björn Steffen
BACKGROUND: Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a curative treatment option for patients with acute myeloid leukemia (AML). During transplantation, patients undergo a period of severe neutropenia, which puts them at high risk for infectious complications. However, the impact of patient colonization with multidrug-resistant organisms (MDRO) on overall survival remains unclear. METHODS: In this retrospective, single-center study, the authors analyzed data from 264 patients with AML who underwent a first allo-HSCT between January 2006 and March 2016 at their institution...
September 28, 2017: Cancer
https://www.readbyqxmd.com/read/28957012/pilot-study-of-antimicrobial-resistance-in-northern-bobwhites-colinus-virginianus
#12
Michael Zhang, Zhenyu Shen, Dale Rollins, William Fales, Shuping Zhang
Antimicrobial resistance (AMR) is an important issue for both wildlife conservation and public health. The purpose of this study was to screen for AMR in fecal bacteria isolated from northern bobwhite (Colinus virginianus), a species that is an ecologically and economically important natural resource in the southern United States. The antimicrobial susceptibility profiles of 45 Escherichia coli isolates, 20 Enterococcus faecalis isolates, and 10 Enterococcus faecium isolates were determined using the Sensititer(TM) microbroth dilution minimum inhibitory concentration (MIC) plate, AVIAN1F...
September 2017: Avian Diseases
https://www.readbyqxmd.com/read/28956488/influence-of-oral-application-of-enterococcus-faecium-al41-on-tgf-%C3%AE-4-and-il-17-expression-and-immunocompetent-cell-distribution-in-chickens-challenged-with-campylobacter-jejuni
#13
Alica Letnická, Viera Karaffová, Mikuláš Levkut, Viera Revajová, Róbert Herich
Campylobacteriosis is mainly caused by infection with Campylobacter jejuni following consumption or handling of Campylobacter-contaminated poultry meat. The aim of this study was to investigate the effect of probiotic Enterococcus faecium AL41 on TGF-β4 and IL-17 expression and on immunocompetent cell distribution after C. jejuni infection in broiler chicken, as a second part of the previous study of Karaffová et al. (2017). Accordingly, day-old chicks were randomly divided into four experimental groups of 10 chicks each (n = 10): control (C), E...
September 2017: Acta Veterinaria Hungarica
https://www.readbyqxmd.com/read/28951015/effectiveness-of-an-ultraviolet-c-disinfection-system-for-reduction-of-healthcare-associated-pathogens
#14
Jui-Hsuan Yang, Un-In Wu, Huei-Min Tai, Wang-Huei Sheng
BACKGROUND: Healthcare-associated infections caused by multidrug-resistant (MDR) pathogens are significantly associated with increased mortality and morbidity. Environmental cleaning can reduce transmission of these pathogens but is often inadequate. Adjunctive methods are warranted to enhance the effectiveness of disinfection particularly in hospital settings where healthcare-associated infections are of major concern. METHODS: We conducted a study to examine the effectiveness of a mobile, automatic device, Hyper Light Disinfection Robot (model: Hyper Light P3), which utilized ultraviolet-C (UV-C) to kill MDR-Pseudomonas aeruginosa, MDR- Acinetobacter baumannii, methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus faecium (VRE), Mycobacterium abscessus and Aspergillus fumigatus...
September 18, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28950164/effects-of-the-predominant-bacteria-from-meju-and-doenjang-on-the-production-of-volatile-compounds-during-soybean-fermentation
#15
Do-Won Jeong, Sojeong Heo, Bitnara Lee, Hyundong Lee, Keuncheol Jeong, Jae-Young Her, Kwang-Geun Lee, Jong-Hoon Lee
We inoculated five starter candidates, Enterococcus faecium, Tetragenococcus halophilus, Bacillus licheniformis, Staphylococcus saprophyticus, and Staphylococcus succinus, into sterilized soybeans to predict their effectiveness for flavor production in fermented soybean foods. All of the starter candidates exhibited sufficient growth and acid production on soybean cultures. Twenty-two volatile compounds, such as acids, alcohols, carbonyls, esters, furans, and pyrazines, were detected from the control and starter candidate-inoculated soybean cultures...
December 4, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28941790/resistance-mechanism-and-clinical-characteristics-of-linezolid-resistant-enterococcus-faecium-a-single-center-study-in-korea
#16
Sun Young Cho, Hye Mee Kim, Doo Ryeon Chung, So Hyun Kim, Hee Jae Huh, Cheol-In Kang, Kyong Ran Peck, Nam Yong Lee, Jae-Hoon Song
OBJECTIVES: This study aimed to determine the prevalence of linezolid-resistant vancomycin-resistant Enterococcus (LR-VRE) and investigate the mechanisms for linezolid resistance with clinical and microbiological characterization. METHODS: All vancomycin-resistant Enterococcus faecium (VREF) isolates from blood and rectal swab cultures during 2012-2015 were tested for linezolid resistance. LR-VREF isolates were tested for antimicrobial susceptibility, genes for glycopeptide resistance, and virulence genes...
September 20, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28935539/molecular-structure-of-cyclomaltodextrinase-derived-from-amylolytic-lactic-acid-bacterium-enterococcus-faecium-k-1-and-properties-of-recombinant-enzymes-expressed-in-escherichia-coli-and-lactobacillus-plantarum
#17
Kridsada Unban, Apinun Kanpiengjai, Saisamorn Lumyong, Thu-Ha Nguyen, Dietmar Haltrich, Chartchai Khanongnuch
Gene encoding cyclomaltodextrinase (Cdx) from amylolytic lactic acid bacterium Enterococcus faecium K-1 was cloned and nucleotide sequence was analyzed. The open-reading frame consisted of 1767bp encoding 588 deduced amino acids. Consequently, four typically conserved regions of the glycoside hydrolase family 13 were revealed; however, nine exceeding amino acids (DSYQMTDVP) were found at the 282-290 position in comparison to previously reported cyclomaltodextrinases. This difference is believed to have an influence on the substrate specificity of this enzyme...
September 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28929961/-national-antimicrobial-resistance-surveillance-system-namrss-external-quality-assessment-studies-2011-2016
#18
Serap Süzük Yıldız, Hüsniye Şimşek, Nilay Çöplü, Zeynep Gülay
Establishment of sustainable and evidence-based surveillance systems are recommended for prevention of microbial resistance by the World Health Organization (WHO). As a necessity of these surveillance systems, participants are recommended to implement an external quality assessment (EQA) program. In this scope, National Antimicrobial Resistance Surveillance System (NARSS) has been established within the Public Health Institute of Turkey (PHIT) in our country since 2011. In the scope of this surveillance, NARSS EQA program has been implemented in a cycle per year and four isolates were sent to participants per cycle every year since 2011...
July 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28918990/long-term-metabolic-persistence-of-gram-positive-bacteria-on-health-care-relevant-plastic
#19
Loree C Heller, Chelsea M Edelblute
BACKGROUND: Health care-associated opportunistic pathogens Staphylococcus aureus and Enterococcus faecium persist on dry environments and can contribute to organism transmission through contact. These organisms can be monitored on surfaces by culture, molecular methods, or metabolic assays. This study was designed to determine the kinetics of bacterial persistence on acrylonitrile butadiene styrene, a plastic commonly used in the manufacture of bedrails. MATERIALS AND METHODS: Polymerase chain reaction for genomic DNA was used to confirm the presence of bacteria cells on this plastic irrespective of viability...
September 14, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28912861/phascolarctobacterium-faecium-abundant-colonization-in-human-gastrointestinal-tract
#20
Feifan Wu, Xianfeng Guo, Jiachun Zhang, Min Zhang, Zihao Ou, Yongzheng Peng
Phascolarctobacterium can produce short-chain fatty acids, including acetate and propionate, and can be associated with the metabolic state and mood of the host. The present study investigated the colonization characteristics of Phascolarctobacterium faecium in healthy individuals <1-80 years old in Southern China. A total of 150 fresh fecal samples were collected, and bacterial DNA was isolated from these samples for quantitative polymerase chain reaction analysis. Phascolarctobacterium faecium demonstrated a high colonization rate and abundant colonization in the human gastrointestinal tract...
October 2017: Experimental and Therapeutic Medicine
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