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Microdilution assay

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https://www.readbyqxmd.com/read/28629354/acetone-leaf-extracts-of-some-south-african-trees-with-high-activity-against-escherichia-coli-also-have-good-antimycobacterial-activity-and-selectivity-index
#1
Ishaku L Elisha, Francien S Botha, Balungile Madikizela, Lyndy J McGaw, Jacobus N Eloff
BACKGROUND: Tuberculosis is a world-wide problem affecting humans and animals. There is increasing development of resistance of the pathogens to current antimycobacterial agents. Many authors have investigated activities of extracts and isolated compounds from plants. The traditional uses of plants have frequently been the criterion to select plants investigated. In this contribution, we investigate whether plant extracts with very good activity against Escherichia coli may also be active against mycobacteria...
June 19, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28613963/cytotoxic-and-antimicrobial-activities-of-cantharellus-cibarius-fr-cantarellaceae
#2
Marina Kolundžić, Tatjana Stanojković, Jelena Radović, Ana Tačić, Margarita Dodevska, Marina Milenković, Francesca Sisto, Carla Masia, Giampietro Farronato, Vesna Nikolić, Tatjana Kundaković
Antibacterial and cytotoxic activities of cyclohexane, dichloromethane, methanol, and aqueous extracts of Cantharellus cibarius were tested. Broth microdilution assay was performed against 10 bacterial strains (Staphylococcus aureus, S. epidermidis, Micrococcus luteus, Bacillus subtilis, Enterococcus feacalis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella abony), with emphasis on Helicobacter pylori. Methanol extract was the most active against H. pylori strains with minimal inhibitory concentration values between 4 and 32 μg/mL...
June 14, 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28611662/an-antifungal-mechanism-of-protolichesterinic-acid-from-the-lichen-usnea-albopunctata-lies-in-the-accumulation-of-intracellular-ros-and-mitochondria-mediated-cell-death-due-to-apoptosis-in-candida-tropicalis
#3
S N Kumar, C Mohandas
Candida species causes superficial and life-threatening systemic infections and are difficult to treat due to the resistance of these organism to various clinically used drugs. Protolichesterinic acid is a well-known lichen compound. Although the antibacterial activity of protolichesterinic acid has been reported earlier, the antifungal property and its mechanism of action are still largely unidentified. The goal of the present investigation is to explore the anticandidal activity and mechanism of action of protolichesterinic acid, especially against Candida tropicalis...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28607012/potent-in-vitro-synergism-of-fluconazole-and-osthole-against-fluconazole-resistant-candida-albicans
#4
De-Dong Li, Dong Chai, Xiao-Wen Huang, Shao-Xing Guan, Jiang Du, Hao-Yu Zhang, Yan Sun, Yuan-Ying Jiang
Osthole is a natural coumarin that exhibits wide biological and pharmacological activities such as neuroprotective, osteogenic, immunomodulation, anti-tumor and anti-inflammatory effects. In this study, we investigated the antifungal effects of osthole in vitro Checkerboard microdilution assay showed that osthole has significant synergistic effect with fluconazole against fluconazole-resistant Candida albicans Similar results was obtained from growth curve assay. Meanwhile, XTT reduction assay demonstrated the synergism of fluconazole and osthole against C...
June 12, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28605445/evaluation-of-two-automated-systems-for-colistin-susceptibility-testing-of-carbapenem-resistant-acinetobacter-baumannii-clinical-isolates
#5
Sophia Vourli, Konstantina Dafopoulou, Georgia Vrioni, Athanassios Tsakris, Spyros Pournaras
Background: Colistin is commonly needed for the treatment of infections due to carbapenem-resistant Acinetobacter baumannii (CRAB) and the determination of its in vitro activity is obviously important. However, the accurate routine antimicrobial susceptibility testing (AST) of colistin is still challenging. The only acceptable method for colistin AST is broth microdilution (BMD); disc and gradient diffusion assays are inappropriate and the performance of semi-automated systems has not been validated...
June 12, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28598305/comparison-of-the-in-vitro-activity-of-ampicillin-and-moxifloxacin-against-listeria-monocytogenes-at-achievable-concentrations-in-the-central-nervous-system
#6
Inmaculada Pupo, Jose A Lepe, Younes Smani, Javier Aznar
PURPOSE: The aim of this study was to compare the in vitro activity of ampicillin and moxifloxacin against six isolates selected from 154 invasive clinical isolates of Listeria monocytogenes and evaluate their intra- and extracellular activities with achievable central nervous system concentrations obtained using Monte Carlo simulations with conventional and unconventional dosages. METHODOLOGY: The MICs and minimal bactericidal concentrations (MBCs) of ampicillin and moxifloxacin were determined by using the broth microdilution method...
June 9, 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28597384/toxicity-against-drosophila-melanogaster-and-antiedematogenic-and-antimicrobial-activities-of-alternanthera-brasiliana-l-kuntze-amaranthaceae
#7
Henrique Douglas Melo Coutinho, Cícera Datiane de Morais Oliveira-Tintino, Saulo Relison Tintino, Raimundo Luiz Silva Pereira, Thiago Sampaio de Freitas, Maria Arlene Pessoa da Silva, Jeferson Luis Franco, Francisco Assis Bezerra da Cunha, José Galberto Martins da Costa, Irwin Rose Alencar de Menezes, Aline Augusti Boligon, João Batista Teixeira da Rocha, Maria Ivaneide Rocha, Joycy Francely Sampaio Dos Santos
Bioactive phytocompounds are studied by several bioactivities demonstrated, as their cytotoxic effects. The aim of this work was to evaluate the phytochemical profile, the toxic effect using the Drosophila melanogaster animal model and the anti-inflammatory and antimicrobial effect of the Alternanthera brasiliana (EEAB) ethanol extract. The phytochemical profile was performed using HPLC. The cytotoxic effect was evaluated in vivo using D. melanogaster. The anti-inflammatory effect was determined by neurogenic and antiedematogenic assays, and the antimicrobial activity was assayed using a microdilution method to determine the minimum inhibitory concentration (MIC) of the EEAB alone and in association with antibiotics...
June 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28596943/in-vitro-evaluation-of-the-colistin-carbapenem-combination-in-clinical-isolates-of-a-baumannii-using-the-checkerboard-etest-and-time-kill-curve-techniques
#8
Micheline A H Soudeiha, Elias A Dahdouh, Eid Azar, Dolla K Sarkis, Ziad Daoud
The worldwide increase in the emergence of carbapenem resistant Acinetobacter baumannii (CRAB) calls for the investigation into alternative approaches for treatment. This study aims to evaluate colistin-carbapenem combinations against Acinetobacter spp., in order to potentially reduce the need for high concentrations of antibiotics in therapy. This study was conducted on 100 non-duplicate Acinetobacter isolates that were collected from different patients admitted at Saint George Hospital-University Medical Center in Beirut...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28595608/antimicrobial-activity-toxicity-and-anti-inflammatory-potential-of-methanolic-extracts-of-four-ethnomedicinal-plant-species-from-punjab-pakistan
#9
Rabia Naz, Hafsa Ayub, Sajid Nawaz, Zia Ul Islam, Tayyaba Yasmin, Asghari Bano, Abdul Wakeel, Saqib Zia, Thomas H Roberts
BACKGROUND: The plant species Aristolochia indica (AI), Melilotus indicus (MI), Tribulus terrestris (TT) and Cuscuta pedicellata (CP) are widely used in folk medicine in the villages around Chowk Azam, South Punjab, Pakistan. The aim of this study was to evaluate the antioxidant activity, phytochemical composition, and the antibacterial, antifungal, cytotoxic and anti-inflammatory potential of the four medicinal plants listed above. For CP stem, this study represents (to the best of our knowledge) the first time phytochemicals have been identified and the antioxidant and anti-inflammatory potential determined...
June 8, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28592323/antibacterial-and-anticancer-activities-of-acetone-extracts-from-in-vitro-cultured-lichen-forming-fungi
#10
Agnieszka Felczykowska, Alicja Pastuszak-Skrzypczak, Anna Pawlik, Krystyna Bogucka, Anna Herman-Antosiewicz, Beata Guzow-Krzemińska
BACKGROUND: Lichens that were used in traditional medicine for ages produce numerous secondary metabolites, however our knowledge about biological activities of substances secreted by separated bionts is scarce. The main objectives of this study were to isolate and find optimal conditions for the growth of mycelia from three common lichen-forming fungi, i.e. Caloplaca pusilla, Protoparmeliopsis muralis and Xanthoria parietina and to evaluate antibacterial and antiproliferative activities of their acetone extracts...
June 7, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28591665/inhibition-of-pseudomonas-aeruginosa-quorum-sensing-by-subinhibitory-concentrations-of-curcumin-with-gentamicin-and-azithromycin
#11
Shahin Bahari, Habib Zeighami, Hesam Mirshahabi, Shekoufeh Roudashti, Fakhri Haghi
OBJECTIVES: Pseudomonas aeruginosa quorum sensing (QS) circuits regulate virulence factors and co-ordinate bacterial pathogenicity. This study aimed to investigate the inhibitory activity of subinhibitory concentrations of curcumin with azithromycin and gentamicin against P. aeruginosa QS-related genes and virulence factors. METHODS: The minimum inhibitory concentrations (MICs) and synergistic activity of curcumin with azithromycin and gentamicin against P. aeruginosa PAO1 were determined using broth microdilution and checkerboard titration methods, respectively...
June 4, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28583381/synergistic-activities-of-meropenem-double-and-triple-combinations-against-carbapenemase-producing-enterobacteriaceae
#12
Marlene Fredborg, Teis E Sondergaard, Mikala Wang
The increasing emergence of carbapenemase-producing Enterobacteriaceae poses a considerable threat to global health as only limited treatment options are available and has therefore led to efforts to discover antibiotic combination regimens effective. The aim of this study was to evaluate in vitro synergistic activity of 10 meropenem double and triple combinations against the 5 most frequently encountered carbapenemases-producing Enterobacteriaceae. Broth microdilution assays showed that the meropenem and ertapenem combination was the most efficient regimen of the double combinations tested (>5-log2 fold decrease)...
May 3, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28583153/in-vitro-antibacterial-activity-of-poly-amidoamine-g7-dendrimer
#13
Mitra Gholami, Rashin Mohammadi, Mohsen Arzanlou, Fakhraddin Akbari Dourbash, Ebrahim Kouhsari, Gharib Majidi, Seyed Mohsen Mohseni, Shahram Nazari
BACKGROUND: Nano-scale dendrimers are synthetic macromolecules that frequently used in medical and health field. Traditional anibiotics are induce bacterial resistence so there is an urgent need for novel antibacterial drug invention. In the present study seventh generation poly (amidoamine) (PAMAM-G7) dendrimer was synthesized and its antibacterial activities were evaluated against representative Gram- negative and Gram-positive bacteria. METHODS: PAMAM-G7 was synthesized with divergent growth method...
June 5, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28573239/therapeutic-potentials-of-ethanolic-extract-of-leaves-of-holarrhena-floribunda-g-don-dur-and-schinz-apocynaceae
#14
Yao Patrick Hoekou, Tchadjobo Tchacondo, Simplice Damintoti Karou, Rakiswende Serge Yerbanga, Elom Achoribo, Ollo Da, Wouyo Atakpama, Komlan Batawila
BACKGROUND: Holarrhena floribunda is a plant of wide usage in the Togolese folk medicine. A previous ethnobotanical survey on the latex plants of the Maritime region of the country revealed that this plant was included in several recipes curing malaria and microbial infections. Therefore, this study aimed to seek for the effectiveness of the ethanolic extract of the plant in the treatment of these diseases. METHODS: The antimicrobial test was performed using the agar well-diffusion and the NCCLS broth microdilution methods, while the in vivo antimalarial activity was evaluated following the four-day suppressive test of Peters...
2017: African Journal of Traditional, Complementary, and Alternative Medicines: AJTCAM
https://www.readbyqxmd.com/read/28558679/demonstration-of-biological-activities-of-extracts-from-isodon-rugosus-wall-ex-benth-separation-and-identification-of-bioactive-phytoconstituents-by-gc-ms-analysis-in-the-ethyl-acetate-extract
#15
Anwar Zeb, Farhat Ullah, Muhammad Ayaz, Sajjad Ahmad, Abdul Sadiq
BACKGROUND: Since long, natural sources have been explored for possible managements of various diseases. In this context, the study is designed to evaluate Isodon rugosus Wall. ex Benth for biological potentials including antibacterial, anthelmintic, insecticidal, anti-termites and anti-Pharaoh activities followed by GC-MS analysis of active fraction to identify various bioactive compounds. METHODS: I. rugosus was investigated against eight bacterial strains using well diffusion method and microdilution method with ceftriaxone as positive control...
May 30, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28553417/synergistic-effect-of-colistin-and-rifampin-against-multidrug-resistant-acinetobacter-baumannii-a-systematic-review-and-meta-analysis
#16
REVIEW
Maryam Mohammadi, Hatef Khayat, Koroush Sayehmiri, Setareh Soroush, Fatemeh Sayehmiri, Somayeh Delfani, Lidija Bogdanovic, Morovat Taherikalani
The existence of infections caused by multidrug resistant (MDR) Acinetobacter baumannii is a growing problem because of the difficulty to treat them. We examined the published literature and focused our analysis on the investigation of the synergism of colistin and rifampin against MDR A. baumannii isolates via systematic review and meta-analysis. A systematic literature search was performed using the following 4 databases (PubMed, Scopus, EMBASE and ISI Web of Sciences). The related articles were evaluated during the period from December 2014 to January 2015...
2017: Open Microbiology Journal
https://www.readbyqxmd.com/read/28552988/introducing-a-novel-mushroom-from-mycophagy-community-with-emphasis-on-biomedical-potency
#17
Somanjana Khatua, Arun Kumar Dutta, Swarnendu Chandra, Soumitra Paloi, Kanad Das, Krishnendu Acharya
Mushrooms have been prized by humankind as medicine and culinary wonder since antiquity. Though several species are ethnically valued; many prospective species are still being discovered. One such wild macrofungus has recently been discovered during subsequent field surveys in West Bengal, India which in turn exposed as a traditionally consumed popular myco-food. The collected taxon was found to be unique with regard to its morphological as well as genetical features. After detailed characterizations, the fungus was identified as a novel taxon belonging to the genus Russula (Russulaceae, Basidiomycota)...
2017: PloS One
https://www.readbyqxmd.com/read/28550367/in-vitro-study-of-antioxidant-and-antibacterial-activities-of-lactobacillus-probiotic-spp
#18
Z Pourramezan, R Kasra Kermanshahi, M Oloomi, A Aliahmadi, H Rezadoost
This study investigated the influence of aeration and minimal medium conditions on antioxidant and antibacterial activities of 21 probiotic Lactobacillus strains isolated from dairy products. The probiotic potential of the isolates was evaluated by pH and bile tolerance. Random amplified polymorphic DNA polymerase chain reaction (RAPD-PCR) was used to confirm the phenotypic identification of isolates. Antioxidant producer isolates were screened by resistance to reactive oxygen species (ROS). The antioxidant and antibacterial activities of extracellular materials after 48 h fermentation with antioxidative strains were determined using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and broth microdilution assays, respectively...
May 26, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28543603/silver-nanoparticles-antimicrobial-activity-cytotoxicity-and-synergism-with-n-acetyl-cysteine
#19
Selwan Hamed, Mohamed Emara, Riham M Shawky, Ramadan A El-Domany, Tareq Youssef
The fast progression of nanotechnology has led to novel therapeutic interventions. Antimicrobial activities of silver nanoparticles (Ag NPs) were tested against standard ATCC strains of Staphylococcus aureus (ATCC 9144), Escherichia coli (O157:H7), Pseudomonas aeruginosa (ATCC 27853), and Candida albicans (ATCC 90028) in addition to 60 clinical isolates collected from cancer patients. Antimicrobial activity was tested by disk diffusion method and MIC values for Ag NPs alone and in combination with N-acetylcysteine (NAC) against tested pathogens were determined by broth microdilution method...
May 22, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28543032/influence-of-different-wild-garlic-allium-ursinum-extracts-on-the-gastrointestinal-system-spasmolytic-antimicrobial-and-antioxidant-properties
#20
Dragana R Pavlović, Milica Veljković, Nikola M Stojanović, Marija Gočmanac-Ignjatović, Tatjana Mihailov-Krstev, Suzana Branković, Dušan Sokolović, Mirjana Marčetić, Niko Radulović, Mirjana Radenković
OBJECTIVES: As there are no previous studies of the European wild-garlic (Allium ursinum) effects on the gastrointestinal system, despite its traditional applications in gastrointestinal disorders' treatment and regular use in the human diet, we have quantified and compared spasmolytic, antimicrobial and antioxidant activities of its different leaf extracts. METHODS: Wild-garlic extracts were tested for spasmolytic activity on isolated rat ileum, antimicrobial activity on selected Gram-positive and Gram-negative bacteria and fungi by microdilution method and antioxidant capacity by DPPH radical-scavenging assay...
May 23, 2017: Journal of Pharmacy and Pharmacology
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