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Aspergillus flavus

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https://www.readbyqxmd.com/read/28640833/investigation-of-pseudomonas-fluorescens-strain-3jw1-on-preventing-and-reducing-aflatoxin-contaminations-in-peanuts
#1
Xiaona Yang, Qi Zhang, Zhi-Yuan Chen, Hongxia Liu, Peiwu Li
Pseudomonas fluorescens strain 3JW1, which has a broad-spectrum antimicrobial activity, was studied to investigate whether it affects the amounts of aflatoxin B1 (AFB1) produced by Aspergillus flavus. It was found that the bacterium reduced the amounts of AFB1 in potato dextrose broth (PDB) and peanut medium by 97.8% and 99.4%, respectively. It also reduced AFB1 by ~183 μg/kg (55.8%) when applied onto peanut kernels. This strain reduced AFB1 via three mechanisms. First, it significantly inhibited A. flavus growth; second, our data showed that strain 3JW1 inhibits aflatoxin biosynthesis by A...
2017: PloS One
https://www.readbyqxmd.com/read/28634799/assessment-of-heat-inactivated-marine-aspergillus-flavus-as-a-novel-biosorbent-for-removal-of-cd-ii-hg-ii-and-pb-ii-from-water
#2
Mohamed E Mahmoud, Gehan M El Zokm, Aida E M Farag, Mohamed S Abdelwahab
A novel marine fungus was isolated and classified as Aspergillus flavus strain EGY11. The heat-inactivated form of isolated Aspergillus flavus was investigated and evaluated as a new eco-friendly and highly efficient biosorbent for removal of toxic heavy metals such as Cd(II), Hg(II), and Pb(II) from aqueous solutions. The SEM morphological studies of biosorbent-loaded metal ions confirmed their direct binding on the surface of heat-inactivated Aspergillus flavus. The metal biosorption capacity values were determined and optimized by the batch technique in the presence of various experimental controlling factors such as pH, contact time, biosorbent dosage, initial metal ion concentration, and coexisting species...
June 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28634472/antifungal-activity-against-filamentous-fungi-of-ts1-a-multifunctional-toxin-from-tityus-serrulatus-scorpion-venom
#3
Welligton M Santussi, Karla C F Bordon, Ana P N Rodrigues Alves, Camila T Cologna, Suraia Said, Eliane C Arantes
Antimicrobial peptides (AMPs) are ubiquitous and multipotent components of the innate immune defense arsenal used by both prokaryotic and eukaryotic organisms. The search for new AMPs has increased in recent years, due to the growing development of microbial resistance to therapeutical drugs. In this work, we evaluate the effects of Tityus serrulatus venom (Tsv), its fractions and its major toxin Ts1, a beta-neurotoxin, on fungi growth. The fractions were obtained by ion-exchange chromatography of Tsv. The growth inhibition of 11 pathogenic and non-pathogenic filamentous fungi (Aspergillus fumigatus, A...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28626746/frequency-of-cutaneous-fungal-infections-and-azole-resistance-of-the-isolates-in-patients-with-diabetes-mellitus
#4
Omid Raiesi, Mansour Siavash, Faezeh Mohammadi, Javaher Chabavizadeh, Behzad Mahaki, Mehrnoush Maherolnaghsh, Parvin Dehghan
BACKGROUND: Diabetic patients are more susceptible to cutaneous fungal infections. The higher blood sugar levels cause increasing the cutaneous fungal infections in these patients. The main objective of this study was to find the frequency of fungal infections among cutaneous lesions of diabetic patients and to investigate azole antifungal agent susceptibility of the isolates. MATERIALS AND METHODS: In this study, type 1diabetes (n = 78) and type 2 diabetes (n = 44) comprised 47 cases (38...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/28626424/relationship-of-mycotoxins-accumulation-and-bioactive-components-variation-in-ginger-after-fungal-inoculation
#5
Zhixin Yang, Haiwei Wang, Guangyao Ying, Meihua Yang, Yujiao Nian, Jiajia Liu, Weijun Kong
Ginger has got increasing worldwide interests due to its extensive biological activities, along with high medical and edible values. But fungal contamination and mycotoxin residues have brought challenges to its quality and safety. In the present study, the relationship of content of mycotoxins accumulation and bioactive components variation in ginger after infection by toxigenic fungi were investigated for the first time to elucidate the influence of fungal contamination on the inherent quality of ginger. After being infected by Aspergillus flavus and Aspergillus carbonarius for different periods, the produced mycotoxins was determined by an immunoaffinity column clean-up based ultra-fast liquid chromatography coupled with tandem mass spectrometry, and the main bioactive components in ginger were analyzed by ultra performance liquid chromatography-photodiode array detection...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28623822/a-novel-photosensitization-treatment-for-the-inactivation-of-fungal-spores-and-cells-mediated-by-curcumin
#6
Fahad Al-Asmari, Ram Mereddy, Yasmina Sultanbawa
The global concerns regarding the emergence of fungicide-resistant strains and the impact of the excessive use of fungicidal practises on our health, food, and environment have increased, leading to a demand for alternative clean green technologies as treatments. Photosensitization is a treatment that utilises a photosensitiser, light and oxygen to cause cell damage to microorganisms. The effect of photosensitization mediated by curcumin on Aspergillus niger, Aspergillus flavus, Penicillium griseofulvum, Penicillium chrysogenum, Fusarium oxysporum, Candida albicans and Zygosaccharomyces bailii was investigated using three methods...
June 8, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28621716/antibacterial-and-antifungal-activities-of-spices
#7
REVIEW
Qing Liu, Xiao Meng, Ya Li, Cai-Ning Zhao, Guo-Yi Tang, Hua-Bin Li
Infectious diseases caused by pathogens and food poisoning caused by spoilage microorganisms are threatening human health all over the world. The efficacies of some antimicrobial agents, which are currently used to extend shelf-life and increase the safety of food products in food industry and to inhibit disease-causing microorganisms in medicine, have been weakened by microbial resistance. Therefore, new antimicrobial agents that could overcome this resistance need to be discovered. Many spices-such as clove, oregano, thyme, cinnamon, and cumin-possessed significant antibacterial and antifungal activities against food spoilage bacteria like Bacillus subtilis and Pseudomonas fluorescens, pathogens like Staphylococcus aureus and Vibrio parahaemolyticus, harmful fungi like Aspergillus flavus, even antibiotic resistant microorganisms such as methicillin resistant Staphylococcus aureus...
June 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28616054/an-investigation-on-non-invasive-fungal-sinusitis-molecular-identification-of-etiologic-agents
#8
Abdolrasoul Mohammadi, Seyed Mostafa Hashemi, Sayed Hamidreza Abtahi, Seyed Mohammad Lajevardi, Sahar Kianipour, Rasoul Mohammadi
BACKGROUND: Fungal sinusitis is increasing worldwide in the past two decades. It is divided into two types including invasive and noninvasive. Noninvasive types contain allergic fungal sinusitis (AFS) and fungus ball. AFS is a hypersensitivity reaction to fungal allergens in the mucosa of the sinonasal tract in atopic individuals. The fungus ball is a different type of noninvasive fungal rhinosinusitis which is delineated as an accumulation of debris and fungal elements inside a paranasal sinus...
2017: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/28612469/functional-analyses-of-the-versicolorin-b-synthase-gene-in-aspergillus%C3%A2-flavus
#9
Silin Ren, Yuewei Yue, Yu Li, Xiaodong Guo, Shihua Wang
Aflatoxin is a toxic, carcinogenic mycotoxin primarily produced by Aspergillus parasiticus and Aspergillus flavus. Previous studies have predicted the existence of more than 20 genes in the gene cluster involved in aflatoxin biosynthesis. Among these genes, aflK encodes versicolorin B synthase, which converts versiconal to versicolorin B. Past research has investigated aflK in A. parasiticus, but few studies have characterized aflK in the animal, plant, and human pathogen A. flavus. To understand the potential role of aflK in A...
June 13, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28610724/corrigendum-to-histone-methyltransferase-aflrmta-gene-is-involved-in-the-morphogenesis-mycotoxin-biosynthesis-and-pathogenicity-of-aspergillus-flavus-toxicon-127-2017-mar-1-112-121-doi-10-1016-j-toxicon-2017-01-013-epub-2017-jan-19
#10
https://www.readbyqxmd.com/read/28605488/in-vitro-activity-of-the-novel-antifungal-compound-f901318-against-difficult-to-treat-aspergillus-isolates
#11
J B Buil, A J M M Rijs, J F Meis, M Birch, D Law, W J G Melchers, P E Verweij
Background: F901318 is a new antifungal agent with a novel mechanism of action with activity against Aspergillus species. We investigated the in vitro activity of F901318 against a collection of Aspergillus isolates. Methods: A total of 213 Aspergillus isolates were used in this study. A total of 143 Aspergillus fumigatus sensu stricto isolates were used, of which 133 were azole resistant [25 TR 34 /L98H; 25 TR 46 /Y121F/T289A; 33 A. fumigatus with cyp51A -associated point mutations (25 G54, 1 G432 and 7 M220); and 50 azole-resistant A...
June 10, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28603120/enzyme-inhibitory-antifungal-antibacterial-and-hemolytic-potential-of-various-fractions-of-colebrookia-oppositifolia
#12
Tauheeda Riaz, Muhammad Athar Abbasi, Azizur Rehman, Sabahat Zahra Siddiqui, Muhammad Shahid, Hina Fatima, Muhammad Ashraf, Syeda Abida Ejaz, Zahid Ghulam Rasool, Ghulam Hasan Abbasi
The purpose of the present investigation was to assess the enzyme inhibition, antifungal, antibacterial and hemolytic activities of various fractions of Colebrookia oppositifolia Smith. The MeOH extract of plant was dissolved in dist. water and partitioned with n-hexane, CHCl3, EtOAc and n-BuOH sequentially. Enzyme inhibition studies were done against four enzymes i.e. α-glucosidase, butyrylcholinesterase, acetyl cholinesterase and lipoxygenase. Ethyl acetate fraction possessed very good activity against α-glucosidase (IC50 57...
January 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28595608/antimicrobial-activity-toxicity-and-anti-inflammatory-potential-of-methanolic-extracts-of-four-ethnomedicinal-plant-species-from-punjab-pakistan
#13
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/28587870/evaluation-of-the-in-vitro-antimicrobial-activity-of-selected-saudi-scorpion-venoms-tested-against-multidrug-resistant-micro-organisms
#14
Abdulrahman K Al-Asmari, Meshref Ali Alamri, Aqeel Salman Almasoudi, Rajamohamed Abbasmanthiri, Maysa Mahfoud
OBJECTIVES: Scorpion venoms are a rich source of bioactive peptides with promising clinical value that may lead to the discovery and development of new drugs. The present study was designed to evaluate the in vitro antimicrobial activities of the venoms extracted from three medically important Saudi scorpions (Androctonus crassicauda, Androctonus bicolor and Leiurus quinquestriatus). METHODS: Antimicrobial assays were performed using a microplate growth inhibition assay against 10 multidrug-resistant (MDR) micro-organisms (4 Gram-negative bacteria, 2 Gram-positive bacteria and 4 fungi and yeasts) at concentrations ranging from 0 to 20mg/mL of each venom...
June 3, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28587144/inhibitory-activities-of-blasticidin-s-derivatives-on-aflatoxin-production-by-aspergillus-flavus
#15
Tomoya Yoshinari, Yoshiko Sugita-Konishi, Takahiro Ohnishi, Jun Terajima
Blasticidin S (BcS) is a protein synthesis inhibitor which shows strong growth inhibitory activity against a number of microorganisms. However, BcS inhibited aflatoxin production by Aspergillus flavus without affecting its growth. In order to obtain information about the structure-activity relationship of BcS as an aflatoxin production inhibitor, BcS derivatives were prepared and their aflatoxin production inhibitory activities were evaluated. Among five derivatives, blasticidin S carboxymethyl ester, deaminohydroxyblasticidin S, and pyrimidinoblasticidin S showed inhibitory activity, while the others did not...
May 26, 2017: Toxins
https://www.readbyqxmd.com/read/28582664/interactions-between-water-activity-and-temperature-on-the-aspergillus-flavus-transcriptome-and-aflatoxin-b1-production
#16
Angel Medina, Matthew K Gilbert, Brian M Mack, Gregory R OBrian, Alicia Rodríguez, Deepak Bhatnagar, Gary Payne, Naresh Magan
Effects of Aspergillus flavus colonization of maize kernels under different water activities (aw; 0.99 and 0.91) and temperatures (30, 37°C) on (a) aflatoxin B1 (AFB1) production and (b) the transcriptome using RNAseq were examined. There was no significant difference (p=0.05) in AFB1 production at 30 and 37°C and 0.99 aw. However, there was a significant (p=0.05) increase in AFB1 at 0.91 aw at 37°C when compared with 30°C/0.99 aw. Environmental stress effects using gene ontology enrichment analysis of the RNA-seq results for increasing temperature at 0...
May 26, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28582408/proteome-wide-profiling-of-protein-lysine-acetylation-in-aspergillus-flavus
#17
Yangyong Lv
Protein lysine acetylation is a prevalent post-translational modification that plays pivotal roles in various biological processes in both prokaryotes and eukaryotes. Aspergillus flavus, as an aflatoxin-producing fungus, has attracted tremendous attention due to its health impact on agricultural commodities. Here, we performed the first lysine-acetylome mapping in this filamentous fungus using immune-affinity-based purification integrated with high-resolution mass spectrometry. Overall, we identified 1383 lysine-acetylation sites in 652 acetylated proteins, which account for 5...
2017: PloS One
https://www.readbyqxmd.com/read/28578264/aflatoxin-b1-inhibition-in-aspergillus-flavus-by-aspergillus-niger-through-down-regulating-expression-of-major-biosynthetic-genes-and-afb1-degradation-by-atoxigenic-a-flavus
#18
Fuguo Xing, Limin Wang, Xiao Liu, Jonathan Nimal Selvaraj, Yan Wang, Yueju Zhao, Yang Liu
Twenty Aspergillus niger strains were isolated from peanuts and 14 strains were able to completely inhibit AFB1 production with co-cultivation. By using a Spin-X centrifuge system, it was confirmed that there are some soluble signal molecules or antibiotics involved in the inhibition by A. niger, although they are absent during the initial 24h of A. flavus growth when it is sensitive to inhibition. In A. flavus, 19 of 20 aflatoxin biosynthetic genes were down-regulated by A. niger. Importantly, the expression of aflS was significantly down-regulated, resulting in a reduction of AflS/AflR ratio...
May 22, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28576356/quantitative-proteomics-reveals-new-insights-into-calcium-mediated-resistance-mechanisms-in-aspergillus-flavus-against-the-antifungal-protein-pgafp-in-cheese
#19
Josué Delgado, Rebecca A Owens, Sean Doyle, Félix Núñez, Miguel A Asensio
The ability of Aspergillus flavus to produce aflatoxins in dairy products presents a potential hazard. The antifungal protein PgAFP from Penicillium chrysogenum inhibits various foodborne toxigenic fungi, including Aspergillus flavus. However, PgAFP did not inhibit A. flavus growth in cheese, which was related to the associated cation content. CaCl2 increased A. flavus permeability and prevented PgAFP-mediated inhibition in potato dextrose broth (PDB). PgAFP did not elicit any additional increase in permeability of CaCl2-incubated A...
September 2017: Food Microbiology
https://www.readbyqxmd.com/read/28571612/microbiological-quality-of-argentinian-paprika
#20
María G Melo González, Stella M Romero, Mila Arjona, Ada G Larumbe, Graciela Vaamonde
The aim of this study was to evaluate the microbiological quality of paprika produced in Catamarca, Argentina. Microbiological analyses were carried out for the enumeration of total aerobic mesophilic bacteria, coliforms, yeasts and molds, and the detection of Salmonella in samples obtained from different local producers during three consecutive years. The mycobiota was identified paying special attention to the mycotoxigenic molds. Standard plate counts of aerobic mesophilic bacteria ranged from 2.7×10(5) to 3...
May 29, 2017: Revista Argentina de Microbiología
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