Karadeniz sedimentlerinden izole edilen deniz bakterilerinin antibiyotik direnci-CLSI ve EUCAST karşılaştırması

Marine sediments are the important reservoirs of antibiotics and resistant genes. Antibiotic resistance becomes a global concern today and bacteria from marine sediments show resistance to multiple microbial agents. This study investigates antibiotic resistance of Gramnegative heterotrophic bacteria from the marine sediment of the Black Sea. The samples were gathered from various sampling locations on the marine environments of the Black Sea between May 2019 and February 2020. The VITEK 2 system was utilized to detect the MIC values against different antibiotics automatically. The MIC values were ranged from 0.12 µg/ml to 80 µg/ml. The highest resistance ratios among all antibiotics were detected as 90% in CLSI and 81% in EUCAST against cefazolin. In general, the resistance ratios were determined as 13.4% in CLSI and 26.1% in EUCAST. All isolates were detected as susceptible to meropenem, cefepime, ceftazidime, colistin, ertapenem, and piperacillin/tazobactam. MAR indexes were ranged between 0 and 0.45. MAR index were detected above or equal the value of 0.2 as 27% in CLSI and 81% in EUCAST among all isolates. This study shows that EUCAST may be better than CLSI in terms of showing the antibiotic exposure among natural isolates and the MAR indexes may be a useful tool for defining the environmental status. The results of this study indicate that antibiotic resistance may be a serious concern in sediments of the Black Sea.Deniz sedimentleri, antibiyotiklerin ve dirençli genlerin önemli rezervuarlarıdır. Antibiyotik direnci günümüzde küresel bir sorun haline gelmektedir ve deniz sedimentlerinden gelen bakteriler, çoklu mikrobiyal ajanlara direnç göstermektedir. Bu çalışma, Karadeniz'in deniz sedimentlerinden izole edilen Gram-negatif heterotrofik bakterilerin antibiyotik direncini araştırmaktadır. Örnekler, Mayıs 2019 ile Şubat 2020 arasında Karadeniz'deki çeşitli örnekleme istasyonlarından toplanmıştır. VITEK 2 sistemi, farklı antibiyotiklere karşı MIC değerlerini otomatik olarak tespit etmek için kullanılmıştır. MİK değerleri 0,12 µg/ml ile 80 µg/ml arasında değişiklik göstermiştir. Tüm antibiyotikler arasında en yüksek direnç oranları sefazoline karşı CLSI'de %90 ve EUCAST'da %81 olarak tespit edilmiştir. Direnç oranları genel olarak CLSI'de %13,4, EUCAST’da ise %26,1 olarak belirlenmiştir. Tüm izolatların meropenem, sefepim, seftazidim, kolistin, ertapenem ve piperasilin/tazobaktama duyarlı olduğu tespit edilmiştir. MAR indeksleri 0 ile 0,45 arasında bulunmuştur. Tüm izolatlarda 0,2 değerinin üzerinde veya eşit olan MAR indeksi CLSI'de %27 ve EUCAST'ta %81 olarak tespit edilmiştir. Bu çalışma, doğal izolatlar arasında antibiyotik maruziyetini gösterme açısından EUCAST'ın CLSI'den daha iyi olabileceğini ve MAR indeksinin çevresel durumu tanımlamada yararlı bir araç olabileceğini belirtmektedir. Bu çalışmanın sonuçları, Karadeniz sedimentlerinde antibiyotik direncinin ciddi bir endişe kaynağı olabileceğini göstermektedir

Türkiye’de toprak havuzlarda ve ağ kafeslerde yetiştirilen çipura balığı’nın (Sparus aurata) görsel karakteristikleri ve kalitesi

The objective of this study is to investigate the quality differences and visual characteristics between cultured gilthead sea bream obtained from earthen ponds and net cage habitats. No significant differences from obtained in two different habitats are determined cultured gilthead sea bream in terms of chemical and microbiological quality. It has been determined that it is a safe food for consumption since it does not contain pathogenic microorganisms such as Escherichia coli and Salmonella spp. that negatively affect food safety. Visual quality differences are distinguished like the skin color, reddish color on the operculum cover, the head shape and the tail transparency from each other. Having unique sensorial characteristics fishes from two different habitats do offer valuable nutrient sources for consumers. Thanks to the controlled aquaculture conditions, safe production of cultured gilthead sea bream is carried out according to food safety in Turkey. Therefore owing to their delicious food source of cultured gilthead sea bream it is preferred for consumption in Turkey and all ower the world.Istanbul University 20886 4353

Kamu Yöneticilerinin Siyasal Ve Yönetsel Ahlaki Davraniş Tipleri

Çalışmada siyasal-yönetsel ahlak ve siyasal-yönetsel yozlaşma kavramları incelenmiştir. Siyasi ve yönetsel yozlaşamaya sebep olan ahlaki tavırları açıklayabilmek için bireyin ahlak gelişimini anlatan teoriler üzerinde durulmuştur. Günümüz Türkiye’sindeki siyasi ve yönetsel yozlaşmalar sadece bugüne ait olmayıp geçmişten günümüze miras olarak gelmişlerdir. Bu durumun nedeni de ülkenin geçirmiş olduğu siyasi kültürel ve ekonomik değişimler olarak açıklanabilir

Multimodal analysis of south-eastern Black Sea sediment bacterial population diversity

This study focused on marine sediments from the Black Sea, mainly due to bacterial diversity-induced public health / biotechnology application value. Sediment samples were gathered from 14 locations at differing depths across Turkish shores on a seasonal basis over 10 months, with bacterial identifications performed through using multimodal analytical platforms. Overall, 26 differing, predominantly Gram-positive (57.5 %) bacterial species were identified for this region, including Bacillaceae (50.0 %) and Pseudomonadaceae (15.0 %). The most dominant classes were identified as Bacilli (52.5 %) and Gammaproteobacteria (40.0 %). Ten isolates (25 %) to the species level and thirty-six isolates (90 %) to the genus level were identified using VITEK® MS and Bruker Microflex® LT/SH, in comparison to 16S rRNA sequencing results. Identified species – particularly, novel reported species – can contribute to the knowledge of microbial life dwelling upon sediments of the south-eastern regions of the Black Sea

Heavy metal resistance of marine bacteria on the sediments of the Black Sea

The Black Sea is unfortunately globally established as a highly polluted sea, with contaminants from various sources polluting its marine sediments. This study aimed at analyzing heavy metal resistance levels by heterotrophic bacteria colonizing marine sediments across Black Sea shores within Turkey. Twenty-nine bacterial samples from marine sediments were investigated through exposure to sixteen heavy metal salts using the microdilution method. The minimum inhibitory concentration values for bacterial colonies within such marine sediment samples ranged from 1000 mM/L. Trough and peak minimum inhibitory concentration values were determined at 331 mg/mL. Peak tolerated and peak toxic heavy metals were identified as iron and cadmium, respectively. Resistance ratios were also obtained in this study. Bacillus wiedmannii was identified as the most resistant bacterial population when exposed to heavy metal salts. This study shows occurrence of heavy metal resistant bacteria within Black Sea sediments

Bio-indicator bacteria & environmental variables of the coastal zones: The example of the Gulluk Bay, Aegean Sea, Turkey

In this study bio-indicator bacteria and environmental variable parameters were investigated in the coastal areas of the Gulluk Bay, Aegean Sea, Turkey. The seawater samples which were taken from surface (0-30 cm) were tested regarding total and fecal coliform, streptococci and nutrients from May to February in 2012-2013. The primary hydrographic parameters were recorded using multiparameter (YSI 556) in situ at the sampling stations. The highest fecal pollution stress and indicator bacteria values were observed in the period between June and August. The finding showed that bacterial pollution sources of the study area, especially in the summer season, under the control of increasing anthropogenic activities. The finding showed that terrestrial pollution sources carry a potential risk for public and ecosystem health and the sustainable use of living sources. Precautions should be formulated and put into action immediately in order to protect the region from bacteriological risks. (C) 2015 Elsevier Ltd. All rights reserved