Sonbahar Mevsiminde İki Örnekleme Metodu Kullanarak Edirne İlinin Doğusunda Havayla Taşınan Fungal Konsantrasyonların Belirlenmesi

DergiPark: 245861trakyafbdGece ve gündüz saatlerinde fungal konsantrasyonlar değişiklik gösterebilir. Kuru sporlar havaya gündüz salınırken nem oranı daha yüksek olan sporlar gece salınmaktadırlar. Türkiye’de havayla taşınan funguslar ile ilgili çalışmalar çok azdır ve yalnızca bazı şehirlerde günlük ve haftalık incelemeler yapılmıştır. Bu çalışmada Edirne şehri günlük fungal konsantrasyonlarının belirlenmesi amaçlanmıştır. Örnekler yerden 11 m yükseklikten alınmıştır. Örneklemeler 11 Ekim 2002 – 15 Kasım 2002 tarihleri arasında, hergün aynı saatlerde olmak üzere birer haftalık zaman dilimlerinde sabah 08.00 ve akşam 20.00’de yapılmıştır. Fungus izolasyonu için yerçekimine dayalı petri plak metodu ve volumetrik örnekleme metodu kullanılmıştır. Sıcaklık ve nısbi nem iklimsel faktörlerin fungal sporları etkileyip etkilemedikleri istatistiki olarak incelenmiş ve fungus sayıları, nısbi nem ve sıcaklık arasında korelasyon bulunmuştur. 42 petri plağına izole edilen toplam 800 fungus kolonisi bulunma sıklıkları belirlenerek cins düzeyinde tanımlamaları yapılmıştır. Volumetrik metot ile m3 de 9337 cfu mikrofungus belirlenmiştir. En baskınları Alternaria, Penicillium ve Trichoderma olan 7 fungus cinsi teşhis edilebilmiştir.Fungal spore concentrations vary during day and night. Dry spore types are released during the day, whereas wet spores that have more humidity ratio are released into the air at night. Studies on airborne fungi in Turkey are very rare, and they are daily and weekly monitored only in some cities. The aim of our study was to determine the daily fungal concentrations in Edirne, Turkey. All samples were taken from a level of 11 m. above ground. The sampling time was carried out bihourly in the day, from 8 am to 20 pm, once a week from October 11 to November 15, 2002. Two sampling methods were used for the isolation of fungi: A gravitational and a volumetric method. Statistical analysis was performed in order to determine the relationship between some environmental factors and airborne counts and some correlation were found between the fungal numbers, relative humidity, sampling hours and temperature. A total of 800 fungal colonies in 42 petri dishes were isolated, quantified to determine the frequency of occurrence and then identified as genus level. 9337 cfu/m3 microfungi were determined by volumetric sampling. Seven fungal genera could be determined, among them Cladosporium and Alternaria were found as the most predominant fungi, followed by Penicillium and Trichoderma

Synthesis, Antimicrobial Activities of New Sulfonamidobenzoxazoles and Molecular Docking Studies on Escherichia coli TEM-1 β-Lactamase

β-Lactam antibiotics are frequently used for treatment of multi-drug resistant microbial infections and the most common mechanism of resistance against these antibiotics is bacterial β-lactamase production. Herein, we reported the design, synthesis and in vitro antimicrobial activities of some new 2-substituted-5-(2,4-dinitrophenylsulfonamido)benzoxazole derivatives. Compounds TN1, TN2, and TN3 were found to be significantly active against E. coli isolate which contains extended spectrum β-lactamase enzyme at the MIC value of 8 µg mL–1 and that is 4-fold higher than the reference drug ampicillin. We performed molecular docking studies into active site of Escherichia coli TEM-1 β-lactamase enzyme in order to predict the protein-ligand interactions. According to the docking results, compounds TN1, TN2, and TN3 showed strong interactions between the important active site residues which are responsible for the catalytic mechanism of TEM-1 β-lactamase enzyme and a good correlation is found with the experimental data. This work is licensed under a Creative Commons Attribution 4.0 International License

Synthesis and antimicrobial evaluation of some novel sulfonylamido-benzoxazoles

A series of 2-(p-substituted phenyl)-5-[(4-substituted phenyl) sulfonylamido]-benzoxazoles were synthesized and tested for their antimicrobial activities. The structures of the new derivatives were elucidated by spectral techniques. The minimum inhibitory concentrations (MIC) of the new benzoxazoles were determined against standard bacterial and fungal strains and drug-resistant isolates and compared to those of several reference drugs

Synthesis and antimicrobial evaluation of novel 5-substituted-2-(<em>p</em>-tert-butylphenyl)benzoxazoles

385-389In the present study, a series of nine novel 5-substituted-2-(p-tert-butylphenyl)benzoxazole derivatives have been synthesized and their structures confirmed by spectral techniques and also tested for their antimicrobial activities. The minimum inhibitory concentrations (MIC) of the new benzoxazoles have been determined against standard bacterial and fungal strains and drug-resistant isolates and compared to those of several reference drugs. The new benzoxazole derivatives are found to possess a broad spectrum of antibacterial activity with MIC values of 8−256 µg/mL. Especially, compound 9 is more active than standard drugs ciprofloxacin and cefotaxime against E. coli isolate with a MIC value of 8 µg/mL. Also new compounds are less active than fluconazole with a MIC value of 256 µg/mL against C. albicans and its isolate except for compound 9 that shows better activity other compounds with a MIC value of >4 µg/mL for their antifungal activity

Design, synthesis, molecular docking, density functional theory and antimicrobial studies of some novel benzoxazole derivatives as structural bioisosteres of nucleotides

A series of some novel 2-(p-tert-butylphenyl)-5-(3-substituted-propionamido)benzoxazole derivatives have been designed, synthesized, evaluated for antimicrobial activity and have performed molecular docking studies against penicillin-binding protein 4 (PBP4) and active and allosteric site of PBP2a; were calculated some theoretical quantum parameters and absorption, distribution, metabolism and excretion (ADME) descriptors. B9 acted at minimum inhibitory concentration (MIC) = 8 mu g/mL against S. aureus, E. faecalis and their drug-resistant isolates and also formed with GLU145 (1.74 angstrom) and ILE144 (1.89 angstrom) two hydrogen bonds at allosteric site of PBP2a with Glide emodel score: -42.168. Delta E of compound B9 had moderate value of all compounds with 0.14742

Synthesis, molecular docking and ADME prediction of some new benzimidazole carboxamidines derivatives as antimicrobial agents

In this study, 15 new 1H-benzimidazole-5-carboxamidine derivative compounds that could be new antimicrobial agents were synthesized and their antimicrobial activities were determined using the microdilution method. When the activity results were examined, it was observed that the antibacterial effects of the new benzimidazole derivatives were weaker than standard drugs, but some derivatives showed significant efficacy against MRSA and VREF with the value of MIC: 8 mu g/ml compared to reference drugs. The antifungal effects of the compounds were found to be weaker compared to the reference drugs. Molecular docking studies of compounds and reference drugs used were performed against PBP4 and the active and allosteric site of PBP2a, and estimated ADME profiles were calculated. In addition, 2D and 3D interactions of N10, one of the most effective antimicrobial compounds compared to reference drugs, were demonstrated in both sites

1H-Benzimidazole-5-carboxamidine derivatives: design, synthesis, molecular docking, DFT and antimicrobial studies

In this study, 15 new N-(cyclohexyl)-2-substituted-1H-benzimidazole-5-carboxamidine derivatives that could be new antimicrobial agents were synthesized and their antimicrobial activities were determined using the microdilution method. Some of the derivatives showed significant efficacy against MRSA and VREF with an MIC value of 8 mu g mL(-1) compared to reference drugs. Molecular docking studies of the compounds against PBP4 and active and allosteric regions of PBP2a were performed and estimated ADME profiles were calculated. The nitrogens of the amidine group of M7, one of the most effective antimicrobial compounds compared to reference drugs, formed two separate hydrogen bonds with ASP275 (1.77 angstrom) and ASP295 (1.83 angstrom) in the allosteric region of PBP2a. Geometric optimization parameters, MEP analysis, and HUMO and LUMO quantum parameters of M7 were calculated using DFT/B3LYP theory and the 6-311G(d,p) basis set and the results are displayed

Synthesis and molecular docking studies of some novel antimicrobial benzamides

YALCIN, Gozde/0000-0002-9689-2239; yildiz, ilkay/0000-0001-9526-0232; Acar, Cemre/0000-0001-8965-3267WOS: 000505596300026PubMed: 31699395Common use of classical antibiotics has caused to the growing emergence of many resistant strains of pathogenic bacteria. Therefore, we aimed to synthesize a number of N-(2-hydroxy-(4 or 5)-nitrophenyl)benzamide derivatives as a new class of antimicrobial compounds. Moreover, our second goal is to predict the interaction between active structures and enzymes (DNA-gyrase and FtsA) in the binding mode. in this study, thirteen N-(2-hydroxy-(4 or 5-nitrophenyl)-substituted-benzamides were synthesized and determined for their antimicrobial activity using the microdilution method. According to this work, none of the compounds showed any activity against Candida albicans and its clinical isolate. Some of the benzamides (4N1, 5N1, 5N2) displayed very significant activity against Staphylococcus aureus and MSSA with < 4 mu g/ml MIC value, even they were found to be more potent than ceftazidime. 4N1 was also found to be more effective than gentamicin against Enterococcus faecalis clinical isolate. Molecular docking studies revealed that 4N1, 5N1, and 5N2 showed a good interactions with DNA-gyrase. Moreover, 5N1 has interacted with FtsA enzyme in the binding mode, as well. Only compound 5N4 displayed very good activity against Escherichia coli ATCC 25922. These findings showed us that 4N1, 5N1, 5N2, and 5N4 could be lead compounds to discover new antibacterial candidates against multidrug-resistant strains

Indoor airborne fungal pollution in newborn units in Turkey

WOS: 000404652900059PubMed ID: 28667414Pathogenic and/or opportunistic fungal species are major causes of nosocomial infections, especially in controlled environments where immunocompromised patients are hospitalized. Indoor fungal contamination in hospital air is associated with a wide range of adverse health effects. Regular determination of fungal spore counts in controlled hospital environments may help reduce the risk of fungal infections. Because infants have inchoate immune systems, they are given immunocompromised patient status. The aim of the present study was to evaluate culturable airborne fungi in the air of hospital newborn units in the Thrace, Marmara, Aegean, and Central Anatolia regions of Turkey. A total of 108 air samples were collected seasonally from newborn units in July 2012, October 2012, January 2013, and April 2013 by using an air sampler and dichloran 18% glycerol agar (DG18) as isolation media. We obtained 2593 fungal colonies comprising 370 fungal isolates representing 109 species of 28 genera, which were identified through multi-loci gene sequencing. Penicillium, Aspergillus, Cladosporium, Talaromyces, and Alternaria were the most abundant genera identified (35.14, 25.40, 17.57, 2.70, and 6.22% of the total, respectively).The Scientific and Technological Research Council of Turkey-TUBITAKTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [111T925]; Management of CBS-KNAW Fungal Biodiversity Centre (Utrecht-The Netherlands)We are very grateful to the "The Scientific and Technological Research Council of Turkey-TUBITAK" for financially supporting our study, Project Number: 111T925. Also special thanks to the Management of CBS-KNAW Fungal Biodiversity Centre (Utrecht-The Netherlands) and Prof. Dr. Robert A. SAMSON for their support in molecular studies in their laboratory for some problematic fungal species from our project and for their kind permission for some of our project staff for working there for certain periods. We wish to thanks Neonatal Managers of Trakya University Medical Faculty, Istanbul University Istanbul Medical Faculty, Eskisehir Osmangazi University Medical Faculty, Ege University Medical Faculty, and Celal Bayar University Medical Faculty for allow our study in mentioned units