203 research outputs found

    Spectral characterizations and antibacterial effect of 2-(5-R-1H-benzimidazol-2-YL)-4-methyl/bromo-phenols and some metal complexes

    Get PDF
    2-(5-H/Cl/Me/NO2-1H-benzimidazol-2-yl)-4-Me/Br-phenols (HL1–HL5) were synthesized. HL1 complexes with Cu(NO3)2, AgNO3, Zn(ClO4)2 and; HL4, HL5 complexes with Zn(ClO4)2 were prepared. The structures of the compounds were confirmed on the basis of elemental analysis, molar conductivity, magnetic moment, FT-IR, 1H- and 13C-NMR. Antibacterial activity of the ligands and the complexes were evaluated using the disk diffusion method in dimethyl sulfoxide (DMSO) as well as the minimal inhibitory concentration (MIC) dilution method, against nine bacteria, and the results were compared with penicillin–G and oxytetracycline. While HL1 ligand has considerable antibacterial activity on B. cereus only; it’s Ag(I) complex show antibacterial effect toward almost all the bacteria. It is highly interesting that HL5 and [Zn(HL5)(L5)]ClO4 exhibit considerable high antibacterial activity toward K. pneumoniae, B. cereus, S. epidermidis and B. subtilis. KEY WORDS: Benzimidazole, Phenol, Metal complexes, Antibacterial activity  Bull. Chem. Soc. Ethiop. 2010, 24(3), 391-400

    Preparation, characterization and antibacterial effect of 2-methoxy-6-(5-H/Me/Cl/NO2-1H-benzimidazol-2-yl)phenols and some transition metal complexes

    Get PDF
    2-Methoxy-6-(5-H/methyl/chloro/nitro-1H-benzimidazol-2-yl)phenols (HLx; x = 1–4, respectively) ligands and HL1 complexes with Fe(NO3)3, Cu(NO3)2, AgNO3 and Zn(NO3)2 were synthesized and characterized. The structures of the compounds were confirmed based on elemental analysis, molar conductivity, magnetic moment, FT-IR, 1H- and 13C-NMR. The antibacterial activity and minimum inhibitory concentration (MIC) of the free ligands, their hydrochloride salts and the complexes were evaluated using the disk diffusion method in dimethyl sulfoxide (DMSO) and the dilution method, respectively, against 9 bacteria. HL1 and HL3, as well as the Cu(II) and Zn(II) complexes, showed antibacterial activity against Gram-positive bacteria

    Sütçü sığırlarda Q hummasının seropozitifliği ve eser elementler arasındaki i̇lişkinin araştırılması

    Get PDF
    Query fever (Q fever) which is caused by Coxiella burnetii is a continuing problem as a zoonotic disease in the world. In ruminants, infections are mostly asymptomatic however, abortions and stillbirths may occur during late pregnancy. Trace elements are important for the reproductive performance of ruminants and all have roles in immune function. However, serum trace element levels of Coxiella seropositive infertile and healthy dairy cows have not been investigated yet. The present was aimed to evaluate the trace element status of cattle associated with Coxiella burnetii. For this purpose, 200 dairy cattle with and without clinical problems (infertility, metritis and abortion) were compared. Q fever infection was confirmed with ELISA. Levels of trace elements of samples were analysed utilizing inductively coupled plasma-optical emission spectrophotometer. Serum levels of trace elements of the samples were expressed as μg/mL. In total, 20 of 200 sera were diagnosed to be positive by ELISA. Nine of 20 sera were positive from asymptomatic cattle. Seven of 11 sera were positive from cattle with infertility, while 4 of 11 sera were positive from cattle with abortion. No significant differences were found between trace element levels of ELISA seropositive cattle and asymptomatic seropositive cattle. In conclusion, although statistical analysis of serum trace elements is no significant, our findings clearly show that analysis of trace element levels in cattle may be useful predictors in early treatment and prognosis. Further studies are required to clarify the connection between Coxiella seropositivity, trace elements and clinical symptoms in cattle.Q humması, Coxiella burnetii tarafından oluşturulan ve tüm dünyada devam eden zoonoz bir hastalıktır. Ruminantlarda enfeksiyon genellikle asemptomatik seyretmekte, ancak gebeliğin geç döneminde abort ve ölü doğumlar görülebilmektedir. Eser elementler ruminantlarda üreme performansı ve immün fonksiyon üzerinde önemli rol oynar. Coxiella pozitif olan kısır ve sağlıklı süt ineklerinde serum eser element düzeyleri henüz araştırılmamıştır. Bu çalışmanın amacı; sığırlarda Coxiella burnetii ile ilişkili serum eser element düzeylerinin değerlendirilmesidir. Bu amaçla klinik olarak hasta olan (infertilite, metritis, abort) ve olmayan süt sığırları karşılaştırıldı. Q ateşi ELISA yöntemiyle teşhis edildi. Eser element seviyelerinin ölçümü, indüktif olarak eşleşmiş plazma-optik emisyon spektrofotometresi kullanılarak gerçekleştirildi. Serum örneklerinden elde edilen sonuçlar μg/mL cinsinden belirtildi. Toplamda 200 örnekten 20 serum ELISA ile pozitif olarak saptandı. Asemptomatik sığırlardan elde edilen 20 serumun 9’u pozitif olarak tespit edildi. Abort yapan sığırlardan elde edilen 11 serumdan 4’ü pozitifken, infertilitesi olan sığırların7’si pozitif olarak belirlendi. ELISA seropozitif ve asemptomatik seropozitif sığırların serum eser element düzeyleri arasında önemli bir farklılık görülmemiştir. Sonuç olarak; serum eser element seviyelerinde istatistiksel olarak önemli bir fark bulunmamasına rağmen çalışmamızda sığırlarda erken tedavi ve prognozun belirlenmesinde eser element analizlerinin kullanışlı bir yöntem olduğu görüldü. Sığırlarda Coxiella seropozitifliği, eser elementler ve klinik semptomlar arasındaki ilişkinin değerlendirilmesi amacıyla daha fazla çalışma yapılması gerektiği düşüncesindeyiz

    15-yıllık periyotta İstanbul Türkiye’de dermatofitoz şüpheli köpek ve kedilerden izole edilen dermatofitler: Güncellenmiş rapor

    Get PDF
    The present research was aimed to determine the prevalence of dermatophytes isolated from symptomatic dogs and cats, within a 15-year-period, in the city of Istanbul, Turkey. Dermatological specimens were collected from 1504 dogs and 846 cats, which were presented clinical signs of ringworm. Direct microscopy and mycological cultures were performed. The fungal growth rate was detected at 8.2% and 22.8% from dogs and cats, respectively. Microsporum canis was the most frequently isolated species followed by Trichophyton spp., M. gypseum, T. mentagrophytes, M. nanum, other Microsporum spp. moreover T. tonsurans. The cats less than two-year age and more than ten-year age showed a statistically significant higher isolation rate of infection (p < 0.05). There were no statistically significant differences between the age of the dogs and the dermatophyte isolation rate and between the gender of the dogs and cats and the dermatophyte isolation rate. As a conclusion, the data suggest an updated report on local epidemiology and define potential etiologic agentsBu araştırma, İstanbul ilinde 15 yıllık bir süre içinde semptomatik köpek ve kedilerden izole edilen dermatofitlerin yaygınlığını belirlemeyi amaçlamıştır. Dermatolojik örnekler ringworm klinik belirtileri gösteren 1504 köpek ve 846 kediden toplandı. Direkt mikroskopi ve mikolojik kültürler yapıldı. Mantar üreme oranları, köpeklerde % 8.2 kedilerde % 22.8 olarak saptandı. En sık izole edilen tür Microsporum canis idi. Bunu Trichophyton spp., M. gypseum, T. mentagrophytes, M. nanum, diğer Microsporum spp. ve T. tonsurans takip etti. İki yaşından küçük ve on yaşından büyük kediler, istatistiksel olarak anlamlı derecede yüksek bir etken izolasyon oranı gösterdi (p <0.05). Köpeklerin yaşı ve dermatofit izolasyon oranları ile kedi ve köpeklerin cinsiyeti ve dermatofit izolasyon oranları arasında istatistiksel olarak anlamlı bir fark bulunmadı. Sonuç olarak, veriler yerel epidemiyoloji üzerine güncel bir rapor sunmakta ve olası etiyolojik ajanları tanımlamaktadır

    Study Of The Use Of Stainless Steel In Building Envelope In Point Of Sustainability

    No full text
    Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2004Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2004Çalışmada, koruyucu bir tabaka gerektirmeyen ve uzun yıllar boyunca hizmet verebilen bir yapı malzemesi olan paslanmaz çeliğin, bina kabuğunda kullanılarak daha sağlıklı ve uzun ömürlü bir kabuk oluşturabileceği hedeflenmiştir.Dört bölümden oluşan çalışmada, giriş bölümünde konunun seçilme nedenleri, kapsam ve işlenişi ortaya konmuştur. İkinci bölümde, sürdürülebilirlik kavramı anlatılmış, dünyada bu konuda yapılan çalışmalar özetlenmiştir. Sürdürülebilirliğin alt kavramları olarak ekoloji, ,insan sağlığı, ekonomi, kullanım ömrü, performans, fonksiyonellik ve estetik olarak belirlenmiştir. Üçüncü bölümde, paslanmaz çeliğin elde edilmesi, kimyasal, fiziksel, mekanik özellikleri, ticari boyutlandırmaları ve işleme teknikleri gibi temel özellikleri verilmiş. Daha sonra önceki bölümde belirlenen sürdürülebilirlik kriterlerine göre bina kabuğunda paslanmaz çelik kullanımı incelenmiştir. Anlatım sırasında değerlendirme yöntemlerine dayanarak yapılmış çalışmalardan örnekler verilmiştir. Sonuç bölümünde ise, önceki bölümde yapılan incelemelerin sonucu olarak özetlemeler yapılmış, malzeme ile ilgili avantaj ve dezavantaj olabilecek durumlar ortaya konmuştur. Ayrıca çalışmada eksik kalan noktalar belirtilmiş ve konunun devamı niteliğinde yapılabilecek çalışmalar için önerilerde bulunulmuştur.In the study, it is aimed to built healthier and more long lasting envelope with the use of stainless steel as a material that is durable and free of a protective coating. As it is a four-sectioned study, the first section gives the reasons for choosing the topic, the scope and the process. In the second section, the concept of sustainability has been told and continuing studies on that subject in the world is summarized. Ecology, human health, economy, service life, performance, functionality and aesthetics are assigned to be the sub-concepts of sustainability. In the third section, the basic properties like production, chemical, physical, mechanical properties, commercial product ranges and processing techniques has been given. Persuingly, depending on the sustainability criterias set in the preceding section, the use of stainless steel in the building envelope is studied. Examples on the basis of evaluation methods has been given in the text. In the conclusion, summaries from the evaluation of other sections has been done and advantageous and disadvantageous situations has been given for the material. Also missing points from the work is pointed out and suggestions for the future studies that will depend on that work has been given.Yüksek LisansM.Sc

    Investigation of Phenotypic and mcr-1-Mediated Colistin Resistance in Escherichia coli

    No full text
    This study aimed to investigate colistin resistance in Escherichia coli isolated from a total of 166 stool samples that were obtained from chickens shipped to slaughter in Turkey and the presence of the mcr-1 gene, which has been recently discovered and is one of many genes causing plasmid-mediated colistin resistance. To this end, 200 E. coli isolates were collected and identified from feces obtained from intestinal samples of the broiler chickens included in this study. To reveal the phenotypic colistin resistance profile, the minimum inhibitory concentration of colistin for each isolate was determined using the cation-adjusted broth microdilution method. Phenotypic colistin resistance was observed in 15 (7.5%) out of 200 E. coli samples obtained from 7 different poultry slaughterhouses. The presence of the mcr-1 gene, which provides plasmid-mediated colistin resistance, was investigated by the polymerase chain reaction method to detect genotypic colistin resistance. The mcr-1 gene was not detected in any of the studied samples, including isolates that exhibited phenotypic colistin resistance. The absence of the plasmid-mediated mcr-1 gene, although colistin resistance was detected, suggested that the resistance was of chromosome origin or that there were other genes responsible for resistance. However, it is thought that it is necessary to conduct new studies that will investigate the newly emerging plasmid-mediated genes in the future
    corecore