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https://www.readbyqxmd.com/read/28931063/plant-flavones-enhance-antimicrobial-activity-of-respiratory-epithelial-cell-secretions-against-pseudomonas-aeruginosa
#1
Benjamin M Hariri, Derek B McMahon, Bei Chen, Nithin D Adappa, James N Palmer, David W Kennedy, Robert J Lee
Flavones are a class of natural plant secondary metabolites that have anti-inflammatory and anti-bacterial effects. Some flavones also activate the T2R14 bitter taste receptor, which is expressed in motile cilia of the sinonasal epithelium and activates innate immune nitric oxide (NO) production. Flavones may thus be potential therapeutics for respiratory infections. Our objective was to examine the anti-microbial effects of flavones on the common sinonasal pathogens Candida albicans, Staphylococcus aureus, and Pseudomonas aeruginosa, evaluating both planktonic and biofilm growth...
2017: PloS One
https://www.readbyqxmd.com/read/28930254/synthesis-antimicrobial-and-antioxidant-activities-of-chalcogen-containing-nitrone-derivatives-from-r-citronellal
#2
Mariana C Ferraz, Renata A Mano, Daniela H Oliveira, Darla S V Maia, Wladimir P Silva, Lucielli Savegnago, Eder J Lenardão, Raquel G Jacob
Background: The main constituents of Cymbopogonnardus (L) Rendle and C. citratus (DC) Stapfessential oils are (R)-citronellal and citral, respectively. Organochalcogen compounds can boost the biological activities of natural products. Methods: Several chalcogen-containing nitrones derived from (R)-citronellal and citral were prepared and evaluated for their antimicrobial and antioxidant activities. The antimicrobial activity was evaluated by the disc diffusion test and the antioxidant properties were evaluated in vitro by DPPH (1,1-diphenyl-2-picryl-hydrazyl), ABTS (2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid), and FRAP (ferric ion reducing antioxidant power) assays...
June 10, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28930089/rare-occurrence-of-heart-lesions-in-pacific-oysters-crassostrea-gigas-caused-by-an-unknown-bacterial-infection
#3
Gary R Meyer, Geoffrey J Lowe, Susan M Bower
On rare occasions, small cream-coloured cysts have been observed in the heart and pericardial cavity of Pacific oysters Crassostrea gigas from British Columbia, Canada. Histopathology revealed the presence of large colonies of bacteria (up to 800 µm in diameter) causing significant host response and hypertrophy of the heart epithelium. The causative bacteria were characterized as follows: Gram-negative, coccoid to small rod-shaped, typically <1.5 µm in size, cell walls highly endowed with surface fimbriae and division via binary fission...
September 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28929967/-results-of-a-multicenter-study-investigating-plasmid-mediated-colistin-resistance-genes-mcr-1-and-mcr-2-in-clinical-enterobacteriaceae-%C3%A4-solates-from-turkey
#4
Ayşe Nur Sarı, Serap Süzük, Onur Karatuna, Dilara Öğünç, Ayşe Esra Karakoç, Zeynep Çizmeci, Hikmet Eda Alışkan, Füsun Cömert, Mustafa Zahir Bakıcı, Nezahat Akpolat, Fatma Feriha Çilli, Yasemin Zer, Aysel Karataş, Bahar Akgün Karapınar, Gülçin Bayramoğlu, Melda Özdamar, Fatma Kalem, Nuran Delialioğlu, Elif Aktaş, Nisel Yılmaz, Şaban Gürcan, Zeynep Gülay
Colistin is a polymyxin antibiotic which is considered as one of the last line agents against infections due to multidrug resistant or carbapenem resistant gram-negative pathogens. Colistin resistance is associated with chromosomal alterations which can usually cause mutations in genes coding specific two component regulator systems. The first plasmid-mediated colistin resistance gene, mcr-1 was described in Escherichia coli and Klebsiella pneumoniae isolates in December 2015 and followed by another plasmid-mediated colistin resistance gene mcr-2 in 2016...
July 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28929965/-a-negleted-bacteria-with-a-case-bartonella-henselae
#5
Kamuran Türker, Bekir Çelebi, Şeyda Andaç, Pınar Bulut, Şenay Yalçın, Saniye Dolhan
Bartonella henselae the causative agent of cat scratch disease (CSD), is a gram-negative, coccobacillus, facultative intracellular bacterium CSD usually presents as a clinical form of benign local lymphadenopathy (LAP) but sometimes it may progress to severe life threatening complications. Despite the fact that CSD is known to be a common disease, which is one of the important causes of local LAPs in the world, there are few publications in our country. For the diagnosis, the clinician should suspect for CSD and has to ask to the patient whether there is a story of cat scratch or not...
July 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28929815/the-challenge-of-curbing-aminoglycoside-resistance-can-antimicrobial-stewardship-programs-play-a-critical-role
#6
Vassiliki Pitiriga, Evangelia Dimitroulia, George Saroglou, Athanassios Tsakris
Aminoglycosides are useful antimicrobials, primarily for serious infections involving aerobic gram-negative pathogens. The inevitable increase in aminoglycoside resistance has led to calls for reducing levels of inappropriate aminoglycoside prescribing through the implementation of various antibiotic stewardship programs (ASPs). These programs mainly include restriction policies and aminoglycoside cycling. Although aminoglycoside resistance rates appear essential for measuring effectiveness of these interventions, most studies have focused on economic outcomes or clinical efficacy and toxicities...
September 20, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28929050/synergistic-effect-of-carum-copticum-and-mentha-piperita-essential-oils-with-ciprofloxacin-vancomycin-and-gentamicin-on-gram-negative-and-gram-positive-bacteria
#7
Gholam-Reza Talei, Mohsen Mohammadi, Mahmoud Bahmani, Mahmoud Rafieian Kopaei
BACKGROUND: Infectious diseases have always been an important health issue in human communities. In the recent years, much research has been conducted on antimicrobial effects of nature-based compounds because of increased prevalence of antibiotic resistance. The present study was conducted to investigate synergistic effect of Carum copticum and Mentha piperita essential oils with ciprofloxacin, vancomycin, and gentamicin on Gram-negative and Gram-positive bacteria. MATERIALS AND METHODS: In this experimental study, the synergistic effects of C...
April 2017: International Journal of Pharmaceutical Investigation
https://www.readbyqxmd.com/read/28928740/microbiome-derived-lipopolysaccharide-enriched-in-the-perinuclear-region-of-alzheimer-s-disease-brain
#8
Yuhai Zhao, Lin Cong, Vivian Jaber, Walter J Lukiw
Abundant clinical, epidemiological, imaging, genetic, molecular, and pathophysiological data together indicate that there occur an unusual inflammatory reaction and a disruption of the innate-immune signaling system in Alzheimer's disease (AD) brain. Despite many years of intense study, the origin and molecular mechanics of these AD-relevant pathogenic signals are still not well understood. Here, we provide evidence that an intensely pro-inflammatory bacterial lipopolysaccharide (LPS), part of a complex mixture of pro-inflammatory neurotoxins arising from abundant Gram-negative bacilli of the human gastrointestinal (GI) tract, are abundant in AD-affected brain neocortex and hippocampus...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28928506/perennial-legumes-as-a-source-of-ingredients-for-healthy-food-proximate-mineral-and-phytoestrogen-composition-and-antibacterial-activity
#9
Bronislava Butkutė, Audrius Padarauskas, Jurgita Cesevičienė, Alvydas Pavilonis, Lukas Taujenis, Nijolė Lemežienė
ABSTRACT: Perennial legumes have been used as edible or medicinal plants since ancient times. The focus of the current study are perennial legumes-Trifolium pratense L., T. medium L., Medicago sativa L., M. lupulina L., Onobrychis viciifolia Scop., Astragalus glycyphyllos L. and A. cicer L.-of branching stage as a potential source of value-added ingredients for healthy food. Freeze-dried samples were analysed for proximal composition, mineral, isoflavone and coumestrol contents as well as for antimicrobial activity...
August 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28928475/isolation-of-the-antibiotic-methyl-r-e-3-1-hydroxy-4-oxocyclopent-2-en-1-yl-acrylate-ea-2801-from-trichoderma-atroviridae
#10
Emilie Adelin, Géraldine Le Goff, Pascal Retailleau, Mercedes Bonfill, Jamal Ouazzani
The endophytic Trichoderma atroviridae UB-LMA was isolated as a symbiont of Taxus baccata and analyzed for its antimicrobial activity. By applying an original approach consisting of solid-state cultivation coupled with solid-phase extraction, a new methyl (R,E)-3-(1-hydroxy-4-oxocyclopent-2-en-1-yl)-acrylate derivative named EA-2801 (1) was isolated together with the previously reported isonitrin A and dermadin methyl ester. The chemical structure of 1 was determined by NMR and MS. Compound 1 showed antimicrobial activity against a panel of Gram-positive and -negative bacteria...
September 20, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28928256/melioidosis-mimicking-tubercular-cold-abscess
#11
Raghuraj Suresh Kundangar, Shyamasunder N Bhat, Simanchal P Mohanty
Burkholderia pseudomallei is a Gram-negative bacillus found in soil. The infection is thought to occur by inoculation or inhalation. It usually affects people with predisposing factors like diabetes mellitus and chronic alcoholism. A 36-year-old man, on the treatment of diabetes in the past 4 years, on oral hypoglycaemic drugs, presented to us with pain and insidious onset of swelling over left loin like a lumbar cold abscess. He underwent incision and drainage of the abscess. As per the culture report, we used ceftazidime for 2 weeks, followed by cotrimoxazole for 6 months...
September 19, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28927194/finding-a-facile-way-for-the-bacterial-dna-transformation-by-biosynthesized-gold-nanoparticles
#12
Madhuree Kumari, Shipra Pandey, Aradhana Mishra, Chandra Shekhar Nautiyal
The major problem encountered during genetic manipulation of bacteria is the inability to get transformed because of their natural non-competency. In this study, to overcome this problem, a cost-effective method was developed by combining the properties of gold nanoparticles (GNPs) and the Yoshida effect. Various parameters, including GNP:plasmid ratio, pH and time, were optimized for stability of the GNP-plasmid conjugate. With non-competent Gram-negative cells, the efficiency ranged between 0.1 and 0.45 × 104 transformants μg-1, while the range was (0...
July 3, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28926883/-etiological-analysis-and-in-vitro-drug-sensitivity-of-bacterial-keratitis-in-northern-china-in-the-period-of-2006-2015
#13
Y Zhang, Z Q Wang, X G Sun
Objective: To analyze the etiology and drug sensitivity of bacterial keratitis and their changes, and to provide evidence for treatment and drug selection of bacterial keratitis. Methods: Retrospective case series study. From January 2006 to December 2015, corneal specimens suspected of bacterial infection were collected and cultured in Beijing Tongren Eye Center. General information of patients, etiological results and drug sensitivity test results were summarized and analyzed. The Chi-square test and Spearman correlation analysis were performed using SPSS 20...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28926774/concurrent-administration-effect-of-antibiotic-and-anti-inflammatory-drugs-on-the-immunotoxicity-of-bacterial-endotoxins
#14
Azza M El Amir, Dalia G Tanious, Hanaa A Mansour
Pseudomonas aeruginosa (P. aeruginosa) is a gram-negative bacterium that causes a variety of diseases in compromised hosts. Bacterial endotoxins such as lipopolysaccharide (LPS) are the major outer surface membrane components that are present in almost all gram-negative bacteria and act as extremely strong stimulators of innate immunity and inflammation of the airway. This study was undertaken to determine the effect of combined administration of Gentamicin (GENT) as an antibiotic and Dexamethasone (DEXA) as an anti-inflammatory drug on some immunological and histological parameters...
September 16, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28926596/bifurcation-kinetics-of-drug-uptake-by-gram-negative-bacteria
#15
David A Westfall, Ganesh Krishnamoorthy, David Wolloscheck, Rupa Sarkar, Helen I Zgurskaya, Valentin V Rybenkov
Cell envelopes of many bacteria consist of two membranes studded with efflux transporters. Such organization protects bacteria from the environment and gives rise to multidrug resistance. We report a kinetic model that accurately describes the permeation properties of this system. The model predicts complex non-linear patterns of drug uptake complete with a bifurcation, which recapitulate the known experimental anomalies. We introduce two kinetic parameters, the efflux and barrier constants, which replace those of Michaelis and Menten for trans-envelope transport...
2017: PloS One
https://www.readbyqxmd.com/read/28925956/sulfadiazine-salicylaldehyde-based-schiff-bases-synthesis-antimicrobial-activity-and-cytotoxicity
#16
Martin Krátký, Magdaléna Dzurková, Jiří Janoušek, Klára Konečná, František Trejtnar, Jiřina Stolaříková, Jarmila Vinšová
The resistance among microbes has brought an urgent need for new drugs. Thus, we synthesized a series of Schiff bases derived from the sulfa drug sulfadiazine and various salicylaldehydes. The resulting 4-[(2-hydroxybenzylidene)amino]-N-(pyrimidin-2-yl)benzene-sulfonamides were characterized and evaluated against Gram-positive and Gram-negative bacteria, yeasts, moulds, Mycobacterium tuberculosis, nontuberculous mycobacteria (M. kansasii, M. avium) and their cytotoxicity was determined. Among bacteria, the genus Staphylococcus, including methicillin-resistant S...
September 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28925946/development-and-biocompatibility-evaluation-of-photocatalytic-tio%C3%A2-reduced-graphene-oxide-based-nanoparticles-designed-for-self-cleaning-purposes
#17
Ionela Cristina Nica, Miruna S Stan, Marcela Popa, Mariana Carmen Chifiriuc, Gratiela G Pircalabioru, Veronica Lazar, Iuliana Dumitrescu, Lucian Diamandescu, Marcel Feder, Mihaela Baibarac, Marin Cernea, Valentin Adrian Maraloiu, Traian Popescu, Anca Dinischiotu
Graphene is widely used in nanotechnologies to amplify the photocatalytic activity of TiO₂, but the development of TiO₂/graphene composites imposes the assessment of their risk to human and environmental health. Therefore, reduced graphene oxide was decorated with two types of TiO₂ particles co-doped with 1% iron and nitrogen, one of them being obtained by a simultaneous precipitation of Ti(3+) and Fe(3+) ions to achieve their uniform distribution, and the other one after a sequential precipitation of these two cations for a higher concentration of iron on the surface...
September 19, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28925927/postoperative-endophthalmitis-caused-by-bosea-thiooxidans
#18
Vaidehi S Dedania, Devon H Ghodasra, David N Zacks
PURPOSE: To report an unusual case of postcataract endophthalmitis secondary to Bosea thiooxidans. METHODS: Case report. RESULTS: An 86-year-old man presented with postoperative endophthalmitis 3 weeks after uncomplicated cataract surgery. He complained of a headache and blurry vision but denied having eye pain. Slit-lamp examination demonstrated leukocytes with a fibrinous membrane in the anterior segment and vitritis. A diagnosis of acute postoperative endophthalmitis was made, and the patient was treated with intravitreal antibiotics...
October 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28925518/chemistry-of-peptidoglycan-in-mycobacterium-tuberculosis-life-style-an-off-the-wall-balance-of-synthesis-and-degradation
#19
Flavia Squeglia, Alessia Ruggiero, Rita Berisio
The cell wall envelope of mycobacteria is structurally distinct from that of both Gram-positive and Gram-negative bacteria. In Mycobacterium tuberculosis, this cell wall has unique structural features and plays a crucial role in drug resistance and macrophage survival under stress conditions. Peptidoglycan is the major constituent of this cell wall, with an important structural role, giving structural strength, and counteracting the osmotic pressure of the cytoplasm. Synthesis of this complex polymer takes place in three stages that occur at three different locations in the cell, from the cytoplasm to the external side of the cell membrane, where polymerization occurs...
September 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28925099/highly-efficiency-antibacterial-diblock-copolypeptides-based-on-lysine-and-phenylalanine
#20
Xiaokai Su, Xinyu Zhou, Zhengzhong Tan, Chuncai Zhou
A series of amphiphilic diblock copolypeptides (K30 -b-F15 , K30 -b-F30 , and K30 -b-F45 ) were synthesized via N-carboxy-α-amino-anhydride ring-opening polymerization. The copolypeptides had excellent antibacterial efficacy to both Gram positive (S. aureus) and Gram negative (E. coli) bacteria. The minimum inhibitory concentrations (MICs) against E. coli and S. aureus are 8 μg mL(-1) and 2 μg mL(-1) , respectively, lower than most natural and artificial antimicrobial peptides (AMPs). The morphological changes of the bacteria treated with diblock copolypeptides were investigated by transmission electron microscopy; the results proved that the diblock copolypeptides had a similar antibacterial pore-forming mechanism to natural cationic peptides...
September 19, 2017: Biopolymers
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