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Microdilution assay

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https://www.readbyqxmd.com/read/29054025/antibacterial-activity-against-cariogenic-bacteria-and-cytotoxic-and-genotoxic-potential-of-anacardium-occidentale-l-and-anadenanthera-macrocarpa-benth-brenan-extracts
#1
Josenildo Segundo Chaves de Araújo, Aline Rogéria Freire de Castilho, Andressa Brito Lira, Andréia Vieira Pereira, Tatiane Kelly Barbosa de Azevêdo, Edja Maria de Melo de Brito Costa, Maria do Socorro Vieira Pereira, Hilzeth Freire Luna Pessoa, Jozinete Vieira Pereira
OBJECTIVES: The present study aimed to assess the antibacterial activity against bacteria with cariogenic relevance, toxic and genotoxic potential of the plants Anacardium occidentale L. and Anadenanthera macrocarpa (Benth.) Bernam. DESIGN: Using a microdilution technique, the extracts were submitted to minimum inhibitory concentration (MIC) testing against Streptococcus mitis (ATCC 903), Streptococcus mutans (ATCC 25175), Streptococcus oralis (ATCC 10557), Streptococcus salivarius (ATCC 7073), Streptococcus sanguinis (ATCC 15300) and Streptococcus sobrinus (ATCC 27609)...
October 14, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28994001/comparison-between-etest-and-broth-microdilution-methods-for-testing-itraconazole-resistant-aspergillus-fumigatus-susceptibility-to-antifungal-combinations
#2
Laura Bedin Denardi, Jéssica Tairine Keller, Maria Isabel de Azevedo, Vanessa Oliveira, Fernanda Baldissera Piasentin, Cecília Bittencourt Severo, Janio Morais Santurio, Sydney Hartz Alves
The checkerboard broth microdilution assay (BMD) is the most frequently used method for the in vitro evaluation of drug combinations. However, its use to evaluate the effect of antifungal drugs on filamentous fungi is sometimes associated with endpoint-reading difficulties, and different degrees of interaction are assigned to the same drug combination. We evaluated combinations of the azoles, itraconazole, posaconazole, and voriconazole, with the echinocandins, anidulafungin, caspofungin, and micafungin, against 15 itraconazole-resistant Aspergillus fumigatus clinical strains via the checkerboard BMD and Etest assay...
October 9, 2017: Mycopathologia
https://www.readbyqxmd.com/read/28983822/in-vitro-activity-of-micafungin-against-biofilms-of-candida-albicans-candida-glabrata-and-candida-parapsilosis-at-different-stages-of-maturation
#3
Małgorzata Prażyńska, Tomasz Bogiel, Eugenia Gospodarek-Komkowska
Candida spp. is able to form a biofilm, which is considered resistant to the majority of antifungals used in medicine. The aim of this study was to evaluate the in vitro activity of micafungin against Candida spp. biofilms at different stages of their maturation (2, 6, and 24 h). We assessed the inhibitory effect of micafungin against 78 clinical isolates of Candida spp., growing as planktonic or sessile cells, by widely recommended broth microdilution method. The in vitro effect on sessile cells viability was evaluated by colorimetric reduction assay...
October 5, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28978682/comparison-of-different-phenotypic-approaches-to-screen-and-detect-mecc-harboring-methicillin-resistant-staphylococcus-aureus
#4
André Kriegeskorte, Evgeny A Idelevich, Andreas Schlattmann, Franziska Layer, Birgit Strommenger, Olivier Denis, Gavin K Paterson, Mark A Holmes, Guido Werner, Karsten Becker
Similar to mecA, mecC confers resistance against beta-lactams, leading to the phenotype of a methicillin-resistant Staphylococcus aureus (MRSA). However, mecC-harboring MRSA pose special difficulties in their detection. The aim of this study was to assess and compare different phenotypic systems for screening, identification, and susceptibility testing of mecC-positive MRSA isolates. A well-characterized collection of mecC-positive S. aureus isolates (n = 111) was used for evaluation. Routinely used approaches were studied to determine their suitability to correctly identify mecC-harboring MRSA including three (semi-)automated antimicrobial susceptibility testing (AST) systems and five selective chromogenic agar plates...
October 4, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28962614/in-vitro-susceptibility-of-borrelia-burgdorferi-isolates-to-three-antibiotics-commonly-used-for-treating-equine-lyme-disease
#5
Sanjie Caol, Thomas Divers, Mark Crisman, Yung-Fu Chang
BACKGROUND: Lyme disease in humans is predominantly treated with tetracycline, macrolides or beta lactam antibiotics that have low minimum inhibitory concentrations (MIC) against Borrelia burgdorferi. Horses with Lyme disease may require long-term treatment making frequent intravenous or intramuscular treatment difficult and when administered orally those drugs may have either a high incidence of side effects or have poor bioavailability. The aim of the present study was to determine the in vitro susceptibility of three B...
September 29, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28961857/comparative-evaluation-of-vitek%C3%A2-2-and-three-commercial-gradient-strip-assays-for-daptomycin-susceptibility-testing-of-staphylococcus-aureus
#6
Robert E Weber, Franziska Layer, Ingo Klare, Guido Werner, Birgit Strommenger
Objectives: MRSA remains a major cause of severe nosocomial infections and the increased use of vancomycin and daptomycin for MRSA treatment over the last decade has led to the isolation of MRSA strains with decreased daptomycin susceptibility. In addition, a growing number of MSSA isolates with reduced susceptibility to daptomycin have been described lately. Surveillance of the emergence of such a daptomycin-non-susceptible MSSA population requires prompt and reliable daptomycin susceptibility testing...
August 7, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28959793/in-vitro-activity-of-kombucha-tea-ethyl-acetate-fraction-against-malassezia-species-isolated-from-seborrhoeic-dermatitis
#7
E Mahmoudi, M Saeidi, M A Marashi, A Moafi, V Mahmoodi, M Zeinolabedini Zamani
BACKGROUND AND PURPOSE: Seborrheic dermatitis is a chronic and recurrent superficial dermatitis in which Malassezia species play an important role. There are different Malassezia species, which have been recently reported to be resistant to common antifungals. Natural sources can be useful alternatives to reduce the emergence of this resistance. Kombucha tea is believed to have potential antimicrobial properties. Regarding this, the present study aimed to investigate the antifungal activity of Kombucha tea ethyl acetate fraction (KEAF) against Malassezia species obtained from the patients with seborrheic dermatitis...
December 2016: Advances in Medical Mycology (Iran)
https://www.readbyqxmd.com/read/28932712/multidrug-and-co-resistance-patterns-of-non-fermenting-gram-negative-bacilli-involved-in-ventilator-associated-pneumonia-carrying-class-1-integron-in-the-north-of-iran
#8
Masoumeh Bagheri-Nesami, Mohammad Sadegh Rezai, Fatemeh Ahangarkani, Alireza Rafiei, Attieh Nikkhah, Gohar Eslami, Kheironesa Shafahi, Azin Hajalibeig, Rezvan Khajavi
INTRODUCTION: Ventilator-associated pneumonia (VAP) due to non-fermenting Gram-negative bacilli (NFGNB), especially Pseudomonas aeruginosa and Acinetobacter spp., is one of the main hospital-acquired infections leading to mortality and morbidity, especially in intensive care units (ICUs). This study seeks to determine the multidrug and co-resistance (MDR) patterns of NFGNB that are agents of VAP, and assess the presence of class 1 integron in these bacteria. METHODS: This cross-sectional study involved VAP patients admitted in the ICUs of 18 hospitals in the Mazandaran province, located in the North of Iran...
September 2017: Germs
https://www.readbyqxmd.com/read/28930245/antioxidant-and-antimicrobial-activities-of-the-essential-oil-of-achillea-millefolium-l-grown-in-france
#9
Chaker El-Kalamouni, Petras Rimantas Venskutonis, Bachar Zebib, Othmane Merah, Christine Raynaud, Thierry Talou
Background: This study aimed to examine the composition of essential oil (EO) of A. millefolium aerial parts wild plant grown in France and evaluate its antioxidant, antibacterial, and antifungal activities. Methods: GC-MS was used to identify the chemical composition of EO. Antioxidant activity (AA) of EO was evaluated by Oxipres method. Antimicrobial activity of EO was evaluated by Agar-well diffusion and a broth microdilution assay. Results: Forty-three volatile compounds were identified. Major compounds were camphor (12...
May 19, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28930241/chemical-composition-antimicrobial-and-antioxidant-activities-of-essential-oils-from-two-avicennia-schaueriana-stapf-leechm-ex-moldenke-acanthaceae-populations
#10
Kamilla N Machado, Telma M Kaneko, Maria Cláudia M Young, Cynthia Murakami, Inês Cordeiro, Paulo Roberto H Moreno
BACKGROUND: Avicennia schaueriana Stapf & Leechm. ex Moldenke (Acanthaceae) is a native species from the Brazilian mangroves presenting ecological and economic significance. This study compared the composition and the biological activities from the essential oils obtained from two A. schaueriana populations collected at Jureia-Itatins and Ilha do Cardoso. METHODS: Essential oils were obtained by conventional means, and their compositions were analyzed by GC-MS...
May 1, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28930232/antimicrobial-antioxidant-and-cytotoxic-activities-of-ocimum-forskolei-and-teucrium-yemense-lamiaceae-essential-oils
#11
Nasser A Awadh Ali, Bhuwan K Chhetri, Noura S Dosoky, Khola Shari, Ahmed J A Al-Fahad, Ludger Wessjohann, William N Setzer
Background:Ocimum forskolei and Teucrium yemense (Lamiaceae) are used in traditional medicine in Yemen. Methods: The chemical composition, antimicrobial, antioxidant and cytotoxic activities of the essential oils isolated from the leaves of Ocimum forskolei Benth. (EOOF) and two different populations of Teucrium yemense Deflers., one collected from Dhamar province (EOTY-d), and another collected from Taiz (EOTY-t) were investigated. The antimicrobial activities of the oils were evaluated against several microorganisms with the disc diffusion test or the broth microdilution test...
April 1, 2017: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28927840/chemical-composition-and-modulation-of-bacterial-drug-resistance-of-the-essential-oil-from-leaves-of-croton-grewioides
#12
Vivianne Marcelino de Medeiros, Yuri Mangueira do Nascimento, Augusto Lopes Souto, Sara Alves Lucena Madeiro, Vicente Carlos de Oliveira Costa, Suellen Maria P M Silva, Vivyanne Dos Santos Falcão Silva, Maria de Fátima Agra, José Pinto de Siqueira-Júnior, Josean Fechine Tavares
The essential oil from leaves of Croton grewioides Baill was obtained by hydrodistillation using Clevenger apparatus, and its chemical composition was analyzed by GC-MS, where 18 compounds were identified, mostly as monoterpenes (55.56%) and sesquiterpenes (44.44%), in which the major constituent was the α-pinene (47.43%). The essential oil of Croton grewioides (EOCg) and its major compound (α-pinene) were evaluated as modulators of antibiotic resistance in strain SA-1199B and IS-58 of Staphylococcus aureus that overexpresses efflux protein...
October 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28926976/chemical-composition-antibacterial-activity-and-synergistic-effects-with-conventional-antibiotics-and-nitric-oxide-production-inhibitory-activity-of-essential-oil-from-geophila-repens-l-i-m-johnst
#13
Huijuanzi Rao, Pengxiang Lai, Yang Gao
Geophila repens (L.) I.M. Johnst, a perennial herb, belongs to the Rubiaceae family. In this study, we identified the chemical composition of the Geophila repens essential oil (GR-EO) for the first time. Totally, seventy-seven compounds were identified according to GC and GC-MS, which represent 98.0% of the oil. And the major components of GR-EO were β-caryophyllene (23.3%), β-elemene (8.0%), farnesyl butanoate (7.4%), myrcene (3.5%), and trans-nerolidol (3.3%). Then we evaluated the antibacterial activities of GR-EO and the synergistic effects of GR-EO in combination with commercial antibiotics using the microdilution and Checkerboard method...
September 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28919715/in-vitro-inhibitory-activities-of-magnolol-against-candida-spp
#14
Peiru Zhou, Jingya Fu, Hong Hua, Xiaosong Liu
Candida spp. cause various infections involving the skin, mucosa, deep tissues, and even life-threatening candidemia. They are regarded as an important pathogen of nosocomial bloodstream infection, with a high mortality rate. As a result of prolonged exposure to azoles, the therapeutic failure associated with azoles resistance has become a serious challenge in clinical situations. Therefore, novel, alternative antifungals are required urgently. In the present study, the CLSI M-27A broth microdilution method and the 2,3-Bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide (XTT) reduction assay were used to evaluate the antifungal effects of magnolol against various standard Candida strains in planktonic mode and biofilm formation, respectively...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28919197/imported-poultry-meat-as-a-source-of-extended-spectrum-cephalosporin-resistant-cmy-2-producing-salmonella-heidelberg-and-s-minnesota-in-european-union-2014-2015
#15
Joana Campos, Joana Mourão, Leonor Silveira, Margarida Saraiva, Cristina Belo Correia, Ana Paula Maçãs, Luísa Peixe, Patrícia Antunes
Extended-spectrum cephalosporin (ESC)-resistant Salmonella has been described at low level in EU, nevertheless the increasing importation of poultry meat could be an important source of epidemic strains carrying ESC-resistant genes. We evaluated ESC resistance and characterized genetic platforms as well as the clonal relatedness of Salmonella isolates from poultry meat products imported into Portugal. All Salmonella isolates recovered from samples of fresh meat destined to be imported into the EU in the scope of Portuguese official border control between 2014 and 2015 were studied...
September 14, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28916324/in%C3%A2-vitro-investigation-of-the-antimicrobial-effect-of-three-bisphosphonates-against-different-bacterial-strains
#16
Michael A Ermer, Simon C Kottmann, Jörg-Elard Otten, Annette Wittmer, Philipp Poxleitner, Klaus Pelz
PURPOSE: Since the first descriptions of medication-related osteonecrosis of the jaw (MRONJ) in 2003, the pathogenesis has remained unanswered. Recent histomorphometric studies have found several microorganisms, including Actinomyces, Bacillus, Fusobacterium, Staphylococcus, Streptococcus, Selenomonas, Treponema, and Candida albicans in necrotic bone. Polymerase chain reaction studies have recently confirmed the occurrence of 48 genera. Only a few studies have examined the antimicrobial effect of bisphosphonates (BPs)...
August 31, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28915875/plectranthus-amboinicus-essential-oil-and-carvacrol-bioactive-against-planktonic-and-biofilm-of-oxacillin-and-vancomycin-resistant-staphylococcus-aureus
#17
Sara Edwirgens Costa Benício Vasconcelos, Hider Machado Melo, Theodora Thays Arruda Cavalcante, Francisco Eduardo Aragão Catunda Júnior, Mário Geraldo de Carvalho, Francisca Gleire Rodrigues Menezes, Oscarina Viana de Sousa, Renata Albuquerque Costa
BACKGROUND: The emergence of multidrug-resistant bacteria is a worldwide concern and in order to find an alternative to this problem, the occurrence of antimicrobial compounds in Plectranthus amboinicus essential oil was investigated. Thus, this study aims to determine susceptibility of Staphylococcus aureus isolated from food to antibiotics, P. amboinicus essential oil (PAEO) and carvacrol. METHODS: Leaves and stem of P. amboinicus were used for extraction of essential oil (PAEO) by hydrodistillation technique and EO chemical analysis was performed by gas chromatography coupled to a mass spectrometer...
September 16, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28904944/antibacterial-and-antibiotic-modifying-activity-of-methanol-extracts-from-six-cameroonian-food-plants-against-multidrug-resistant-enteric-bacteria
#18
Joachim K Dzotam, Victor Kuete
The present work was designed to investigate the antibacterial activities of methanol extracts from six Cameroonian edible plants and their synergistic effects with some commonly used antibiotics against multidrug-resistant (MDR) Gram-negative bacteria expressing active efflux pumps. The extracts were subjected to qualitative phytochemical screening and the microdilution broth method was used for antibacterial assays. The results of phytochemical tests indicate that all tested crude extracts contained polyphenols, flavonoids, triterpenes, and steroids...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28901803/in-vitro-activity-of-calcium-channel-blockers-in-combination-with-conventional-antifungal-agents-against-clinically-important-filamentous-fungi
#19
Mónika Homa, Kinga Hegedűs, Ádám Fülöp, Vanessza Wolfárt, Shine Kadaikunnan, Jamal M Khaled, Naiyf S Alharbi, Csaba Vágvölgyi, László Galgóczy
Despite the current therapeutic options, filamentous fungal infections are associated with high mortality rate especially in immunocompromised patients. In order to find a new potential therapeutic approach, the in vitro inhibitory effect of two antiarrhythmic agents, diltiazem and verapamil hydrochloride were tested against different clinical isolates of ascomycetous and mucoralean filamentous fungi. The in vitro combinations of these non-antifungal drugs with azole and polyene antifungal agents were also examined...
September 2017: Acta Biologica Hungarica
https://www.readbyqxmd.com/read/28901801/screening-of-some-biological-activities-of-alyssum-fulvescens-var-fulvescens-known-as-ege-madwort
#20
Cennet Ozay, Ramazan Mammadov
In this research, the phenolic composition, antioxidant, antibacterial and cytotoxic activities of the methanolic extracts obtained from Alyssum fulvescens var. fulvescens aerial parts known as Ege kuduzotu in western Turkey, were firstly investigated. The antioxidant activity of the extract was determined by DPPH, metal chelating, phosphomolybdenum, β-carotene/linoleic acid and ferric reducing power assays. Moreover, total phenolic and flavonoid contents in the extract were investigated. The brine shrimp (Artemia salina L...
September 2017: Acta Biologica Hungarica
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