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Microdilution assay

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https://www.readbyqxmd.com/read/29458147/sessein-and-isosessein-with-anti-inflammatory-antibacterial-and-antioxidant-activity-isolated-from-salvia-sessei-benth
#1
Abraham Gómez-Rivera, Manasés González-Cortazar, Maribel Herrera-Ruíz, Alejandro Zamilpa, Verónica Rodríguez-López
ETHNOPHARMACOLOGICAL RELEVANCE: Salvia sessei Benth, popularly known as "pipilolxochitl" or "sabanito", is a plant utilized in Mexico in traditional medicine for the treatment of erysipela. To date, only one report, to our knowledge, has been found in which a royleanone-type diterpene of the aerial parts of the species was isolated but, again to our knowledge, studies have not been conducted on the pharmacological activity of extracts and compounds isolated from this plant...
February 16, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29452992/activity-of-ceftobiprole-against-staphylococcus-spec-isolates-derived-from-foreign-body-associated-infections
#2
Gunnar T R Hischebeth, Sascha Gravius, Ernst Molitor, Hendrik Kohlhof, Achim Hoerauf, Caecilia Hilgers, Thomas M Randau
Antibiotic therapy is essential in foreign body associated infections. The treatment regime should aim at high tissue concentrations, high bioavailability, high biofilm penetration and good tolerance. We investigated whether the new cephalosporin ceftobiprole is active against clinical isolates from musculoskeletal foreign body associated infections. One hundred ninety-six staphylococci isolates (coagulase negative staphylococci and Staphylococcus aureus) derived from foreign body associated infections were tested towards susceptibility to ceftobiprole, using a test strip assay and broth microdilution...
January 31, 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29452197/essential-oils-from-origanum-vulgare-and-salvia-officinalis-exhibit-antibacterial-and-anti-biofilm-activities-against-streptococcus-pyogenes
#3
Niluni M Wijesundara, H P Vasantha Rupasinghe
In the present study, essential oils (EOs) extracted from oregano, sage, cloves, and ginger were evaluated for the phytochemical profile, antibacterial, and anti-biofilm activities against Streptococcus pyogenes. The broth microdilution method was used to determine the minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) of EOs. The minimum biofilm inhibitory concentrations (MBICs) were determined using MTT assay and fixed biofilms were observed through scan electron microscopy...
February 13, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29434938/genetic-characterization-and-in-vitro-activity-of-antimicrobial-combinations-of-multidrug-resistant-acinetobacter-baumannii-from-a-general-hospital-in-china
#4
Fang Chen, Ling Wang, Min Wang, Yixin Xie, Xiaomeng Xia, Xianping Li, Yanhua Liu, Wei Cao, Tingting Zhang, Pengling Li, Min Yang
The present study aimed to develop a rational therapy based on the genetic epidemiology, molecular mechanism evaluation and in vitro antibiotic combinations activity in multidrug-resistant Acinetobacter baumannii (MDRAB). MDRAB was screened by the Kirby-Bauer method. The random amplified polymorphic DNA technique was used to establish genetic fingerprinting, and a series of resistance genes were detected by polymerase chain reaction. Antimicrobial agents including amikacin (AK), cefoperazone/sulbactam (SCF I/II), meropenem (MEM), minocycline (MINO) and ciprofloxacin (CIP) were used to determine the minimum inhibitory concentrations (MICs) and interactions between antibiotics by the broth microdilution method and chequerboard assays...
February 2018: Oncology Letters
https://www.readbyqxmd.com/read/29433688/synergism-of-prenylflavonoids-from-morus-alba-root-bark-against-clinical-mrsa-isolates
#5
Guo-Ying Zuo, Cui-Xian Yang, Jun Han, Yu-Qing Li, Gen-Chun Wang
BACKGROUND: Clinical methicillin-resistant Staphylococcus aureus (MRSA) is a thorny problem in current anti-infective therapeutics and a challenge of new drug development. Plant prenylflavonoids possess anti-MRSA activity, but few of the prenylflavonoids have been reported the synergistic anti-MRSA effect when they are used in combination with conventional antibacterial agents. PURPOSE: This study deals with anti-MRSA activity of four prenylflavonoids from the root bark of Morus alba and their synergism with 11 conventional antibacterial agents...
January 15, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29423192/synergistic-effect-of-eugenol-with-colistin-against-clinical-isolated-colistin-resistant-escherichia-coli-strains
#6
Yi-Ming Wang, Ling-Cong Kong, Jie Liu, Hong-Xia Ma
Background: Bacterial infections have become more challenging to treat due to the emergence of multidrug-resistant pathogenic bacteria. Combined antibiotics prove to be a relatively effective method to control such resistant strains. This study aim to investigate synergistic activity of eugenol combined with colistin against a collection of clinical isolated Escherichia coli (E.coli) strains, and to evaluate potential interaction. Methods: Antimicrobial susceptibility, minimum inhibitory concentration (MIC) and fractional inhibitory concentration index (FICI) of the bacteria were determined by disk diffusion assay, broth microdilution method and checkerboard assay, respectively...
2018: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/29422272/comparative-evaluation-of-different-gradient-diffusion-tests-for-detection-of-azole-resistance-in-aspergillus-fumigatus
#7
Evgeny A Idelevich, Uwe Groß, Karsten Becker, Oliver Bader
Gradient diffusion assays Etest and MIC Test Strip for itraconazole, posaconazole and voriconazole as well as isavuconazole (MIC Test Strip) were evaluated for Aspergillus fumigatus against EUCAST broth microdilution. Both assays demonstrated generally good performance; however, posaconazole MIC Test Strip showed low agreement with broth microdilution due to MIC overestimation.
January 9, 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29422064/-antimicrobial-and-antiproliferative-activity-of-essential-oil-aqueous-and-ethanolic-extracts-of-ocimum-micranthum-willd-leaves
#8
Isabel O Caamal-Herrera, Leydi M Carrillo-Cocom, Diana Y Escalante-Réndiz, Diana Aráiz-Hernández, José A Azamar-Barrios
BACKGROUND: Ocimum micranthum Willd is a plant used in traditional medicine practiced in the region of the Yucatan peninsula. In particular, it is used for the treatment of cutaneous infections and wound healing, however there are currently no existing scientific studies that support these applications. The aim of the present study was to evaluate the antimicrobial and the in vitro proliferative activity (on healthy mammalian cell lines) of the essential oil and extracts (aqueous and ethanolic) of this plant...
February 8, 2018: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29421316/in-vitro-activity-of-novel-anti-mrsa-comparator-agents-against-staphylococci-involved-in-prosthetic-joint-infections
#9
Christophe Isnard, Anne Dhalluin, Damasie Malandain, Quentin Bruey, Michel Auzou, Jocelyn Michon, Jean-Christophe Giard, François Guérin, Vincent Cattoir
OBJECTIVES: Ceftaroline and ceftobiprole are new parenteral cephalosporins with potent activity against methicillin-resistant (MR) staphylococci, which are the leading cause of prosthetic joint infections (PJIs). The aim of the study was to determine and compare in vitro activities of both molecules against staphylococcal isolates recovered from clinically-documented PJIs. METHODS: A collection of 200 non-redundant clinical isolates (100 Staphylococcus aureus and 100 coagulase-negative staphylococci [CoNS], including 19 and 27 MR isolates, respectively) was studied...
February 5, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29419803/antibacterial-activities-of-azole-complexes-combined-with-silver-nanoparticles
#10
Nestor J Bello-Vieda, Homero F Pastrana, Manuel F Garavito, Alba G Ávila, Adriana M Celis, Alvaro Muñoz-Castro, Silvia Restrepo, John J Hurtado
Growing antimicrobial resistance is considered a potential threat for human health security by health organizations, such as the WHO, CDC and FDA, pointing to MRSA as an example. New antibacterial drugs and complex derivatives are needed to combat the development of bacterial resistance. Six new copper and cobalt complexes of azole derivatives were synthesized and isolated as air-stable solids and characterized by melting point analyses, elemental analyses, thermogravimetric analyses (TGA), and infrared and ultraviolet/visible spectroscopy...
February 8, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29412250/susceptibility-of-cariogenic-microorganisms-to-phytoconstituents
#11
G L S Ferreira, L M D Bezerra, I L A Ribeiro, R C D Morais Júnior, R D Castro
This study aimed to evaluate the in vitro antibacterial activity of the phytochemicals thymol, linalool, and citronellol against Streptococcus mutans, Streptococcus salivarius and Streptococcus oralis. Disk diffusion screening on solid medium and measurement of the diameter of the bacterial growth inhibition halos was the technique utilized. The Minimum Inhibitory Concentration (MIC) of the substances was determined using serial substance dilutions and microdilution technique in Brain Heart Infusion culture medium...
February 1, 2018: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/29408033/relative-performance-of-antimicrobial-susceptibility-assays-on-clinical-escherichia-coli-isolates-from-animals
#12
Skye Badger, Sam Abraham, Sugiyono Saputra, Darren J Trott, John Turnidge, Tahlia Mitchell, Charles G B Caraguel, David Jordan
The assessment of antimicrobial resistance in bacteria derived from animals is often performed using the disc diffusion assay. However broth-microdilution is the preferred assay for national antimicrobial resistance surveillance programs. This study aimed to evaluate the accuracy of disc diffusion relative to broth-microdilution across a panel of 12 antimicrobials using data from a collection of 994 clinical Escherichia coli isolates from animals. Disc diffusion performance was evaluated by diagnostic sensitivity, specificity, likelihood ratio pairs and receive-operating characteristic (ROC) analysis...
February 2018: Veterinary Microbiology
https://www.readbyqxmd.com/read/29405384/in-vitro-antibiofilm-and-antiadhesion-effects-of-magnesium-oxide-nanoparticles-against-antibiotic-resistant-bacteria
#13
Sumreen Hayat, Saima Muzammil, Muhammad Hidayat Rasool, Zonaira Nisar, Syed Zajif Hussain, Anjum Nasim Sabri, Saba Jamil
The aim of the current investigation was to determine antibacterial and antibiofilm potential of magnesium oxide (MgO) nanoparticles against antibiotic resistant clinical strains of bacteria. MgO nanoparticles were synthesized by wet chemical method, and were further characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). Antibacterial activity was determined by broth microdilution and agar diffusion method. Bradford method was used to assess cellular protein leakage as a result of loss of membrane integrity...
February 6, 2018: Microbiology and Immunology
https://www.readbyqxmd.com/read/29402952/histone-h5-is-a-potent-antimicrobial-agent-and-a-template-for-novel-antimicrobial-peptides
#14
Joelle Jodoin, Maxwell T Hincke
Modern medicine is challenged continuously by the increasing prevalence of antibiotic resistant bacteria. Cationic antimicrobial peptides and their derivatives are interesting potential alternatives to antibiotics due to their rapid action, broad-spectrum of antimicrobial activity and limited emergence of bacterial resistance. This study reports the novel antimicrobial properties of histone H5, purified from chicken erythrocytes, and histone H5-derived synthetic peptides. Broth microdilution assays revealed that histone H5 has potent broad-spectrum antimicrobial activity against Gram-positive and Gram-negative planktonic bacteria (MIC range: 1...
February 5, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29389586/evaluation-of-synergistic-anticandidal-and-apoptotic-effects-of-ferulic-acid-and-caspofungin-against-candida-albicans
#15
Zerrin Canturk
This study aimed to investigate the synergy between anticandidal and apoptotic effects of ferulic acid and caspofungin against Candida albicans and Candida glabrata, with the help of a quantitative checkerboard microdilution assay using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) as a viability dye. Apoptotic effects of caspofungin and ferulic acid concentrations (alone and combined) were analyzed for C. albicans and C. glabrata based on annexin V-propidium iodide binding capacities using flow cytometric analysis...
January 2018: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/29382105/study-of-the-anti-staphylococcal-potential-of-honeys-produced-in-northern-poland
#16
Katarzyna Grecka, Piotr M Kuś, Randy W Worobo, Piotr Szweda
The antimicrobial activity of 144 samples of honeys including 95 products from apiaries located in Northern Poland was evaluated. The antibacterial activity of those natural products, their thermal stability, and activity in the presence of catalase was investigated by microdilution assays in titration plates. The MTT assay was performed for the determination of anti-biofilm activity. Spectrophotometric assays were used for the determination of antioxidant potential, total phenolic content, and ability to generate hydrogen peroxide...
January 28, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29370147/antifungal-activity-of-commercial-essential-oils-and-biocides-against-candida-albicans
#17
Elisa Serra, Lilia Araida Hidalgo-Bastida, Joanna Verran, David Williams, Sladjana Malic
Management of oral candidosis, most frequently caused by Candida albicans, is limited due to the relatively low number of antifungal drugs and the emergence of antifungal tolerance. In this study, the antifungal activity of a range of commercial essential oils, two terpenes, chlorhexidine and triclosan was evaluated against C. albicans in planktonic and biofilm form. In addition, cytotoxicity of the most promising compounds was assessed using murine fibroblasts and expressed as half maximal inhibitory concentrations (IC50)...
January 25, 2018: Pathogens
https://www.readbyqxmd.com/read/29349359/resensitization-of-methicillin-resistant-staphylococcus-aureus-by-amoxapine-an-fda-approved-antidepressant
#18
Tyler J Wilson, Meghan S Blackledge, Patrick A Vigueira
The rapid increase in bacterial resistance to antibiotics is a global healthcare crisis. Non-antibiotic pharmaceuticals that have attained approval by the United States Food and Drug Administration have the potential to be repurposed as bacterial resistance-modifying agents and therefore could become valuable resources in our battle against antibiotic-resistant microbes. Amoxapine is a tetracyclic antidepressant used in the treatment of major depressive disorder. Here we demonstrate the ability of amoxapine to resensitize methicillin-resistant Staphylococcus aureus strain ATCC 43300 to oxacillin in both agar diffusion and broth microdilution assays...
January 2018: Heliyon
https://www.readbyqxmd.com/read/29348093/antifungal-and-cytotoxic-activities-of-selected-medicinal-plants-from-malaysia
#19
Yik Sin Chan, Yit Hong Cheah, Poh Zen Chong, Hui Lai Khor, Wen Siang Teh, Kong Soo Khoo, Hean Chooi Ong, Nam Weng Sit
This study was conducted to investigate the antifungal potential and cytotoxicity of selected medicinal plants from Malaysia. The extracts from the stem of Cissus quadrangularis and the leaves of Asplenium nidus, Pereskia bleo, Persicaria odorata and Sauropus androgynus were assayed against six fungi using p-iodonitrotetrazolium-based on colorimetric broth microdilution method. All the plant extracts were found to be fungicidal against at least one type of fungus. The strongest fungicidal activity (minimum fungicidal concentration=0...
January 2018: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29331369/equisetum-telmateia-extracts-chemical-compositions-antioxidant-activity-and-antimicrobial-effect-on-the-growth-of-some-pathogenic-strain-causing-poisoning-and-infection
#20
Marzie Yeganegi, Farideh Tabatabaei Yazdi, Seyed Ali Mortazavi, Javad Asili, Behrooz Alizadeh Behbahani, Adel Beig Babaei
The aerial parts of Equisetum telmateia have been used as a source of biologically active compounds to treat inflammatory, diarrhea, stomach-ache, eczema and mouth infections in traditional medicine. The aim of this work is to evaluate the extraction yield, chemical compositions, antioxidant activity and antimicrobial activity of E. telmateia extracts on Staphylococcus aureus, Bacillus cereus, Escherichia coli, Salmonella typhi and Candida albicans. Chemical compositions E. telmateia was analyzed by high performance liquid chromatography (HPLC) using a C18 column...
January 10, 2018: Microbial Pathogenesis
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