Bulunan: 27 Adet 0.001 sn
İndekslenen Platformlar CABI
166183

Limit Values of Dissolved Nutrients for the Assessment of Eutrophication in the Northeastern Mediterranean Rivers

Akçay, İsmail | Özbay, Özgür

This study attempted to determine the limit values of dissolved nutrients for assessing trophic status and water quality of Northeastern Mediterranean Rivers from the previously published nutrient data sets. Study findings indicated that the oligotrophic river waters should have concentrations of total phosphorus, orthophosphate, ammonium and total nitrogen less than 0.13 mg/L, 0.07 mg/L, 0.11 mg/L and 0.90 mg/L, respectively. The proposed limit values defining oligotrophy, mesotrophy and eutrophy differed from those reported by the Surface Water Quality Regulation and the commonly used reference values. These discrepancies were probably due to the rivers' distinct physical and biochemical characteristics. New approaches, such as modeling studies, are needed to define threshold and referen...

167493

Effects of Clove Oil and Eugenol on Anaesthesia and Some Hematological Parameters of European Eel Anguilla anguilla, L., 1758

HUNT, ARZU ÖZLÜER

To investigate anaesthetic and some hematological effects of clove oil and eugenol for European eel, Anguilla anguilla, L., 1758, 0.0, 0.025, 0.05 and 0.075 mlll of clove oil or 0.0, 2.250, 3.375 and 4.500 mlll of eugenol were applied to fish (80.9528.94 g). After fish was anaesthetized, half of fishes from each group were transferred into recovery tanks (to clean water), whereas, other half was retained there for next 48h. Induction time ranged between 3 and 5 min for clove oil and 2 and 5 min for eugenol. Fish reached to slh anaesthesia stage in all experimental groups except control and the lowest concentration group of both anaesthetics. Reaching the fish to 8th stage of recovery took 60 min in all groups. Opercular rates of fish in test groups of clove oil and eugonal decreased...

166182

Ecological and Health Risk Assessment in Surface Sediments of the Berdan River Basin (Mersin-Türkiye)

Akçay, İsmail | Özbay, Özgür

Berdan River (Tarsus-Mersin) is one of the major rivers flowing into the coastal region of Northeastern (NE) Mediterranean Sea. Determination of water and sediment quality is of great importance for the sustainable management of streams and rivers. In this study, it was aimed to determine metal ((Fe), Manganese (Mn), Chromium (Cr), Nickel (Ni) Zinc (Zn), Cadmium (Cd) and Lead (Pb)) pollution status of sediments in Berdan River caused by human activities by using Enrichment Factor (EF), Geoaccumulation Index (Igeo), Contamination Factor (CF) and Pollution Load Index (PLI). Furthermore, the potential health risk assessment was determined as the non-carcinogenic and carcinogenic risk for children and adults by using chronic daily intake (CDI), hazard quotients (HQ), hazard index (HI), cancer ...

167498

Mersin’de Tüketime Sunulan Gökkuşağı Alabalıklarında (Oncorhynchus mykiss Walbaum, 1792) Motil Aeromonas’ların Araştırılması ve Mezofilik Aerobik Bakteri Sayımı

ÖZER, Selmin

An investigation of motil aeromonads and mesophilic aerobic bacteria count in rainbow trout (Oncorhynchus mykiss Walbaum, 1792) marketed in Mersin. In this study, Rainbow trout, sold at three different outlets in Mersin, were tested for motil Aeromonads, zoonose disease agents. 120 samples were collected and analysed from November 2003 to June 2004. Motil Aeromonads were not isolated in any of the Rainbow trout samples. The 8 month mean values of mesophilic aerobic bacteria count of the skin, muscle, organs and intestine of the fishes were at the 1. outlet respectivly 7,4x105, 4,5x104, 6,9x104 and 1,1x107; at 2. outlet 6,8x104, 5,4x103, 8,3x103 and 4,9x106 and at 3. outlet 1,7x105, 1,3x104, 1,1x104 and 2,9x106 CFU g-1. Bu çalışmada, zoonotik hastalık etkenlerinden Motil Aeromonas’ların Mer...

166232

Mersin sahilinde Dağılımı Bulunan Ulva rigida (C. Agardh 1823)'nın Yağ Asidi Profilinde Bölge Farklılıklarına Bağlı Değişimler

Alp, Mehmet Tahir | Börekçi, Nahit Soner | Ayas, Deniz

Çalışmada kullanılan Ulva rigida örnekleri Mersin sahilinin farklı noktalarından (1. istasyon; Çamlıbel, 2. istasyon; Karaduvar, 3. istasyon; Marina, 4. istasyon; Hilton) 2016 yılında ilkbahar mevsiminde toplanmıştır. U. rigida’nın toplam yağ ve yağ asidi düzeyleri belirlenmiştir. Toplam yağ düzeyi için sırasıyla 1. istasyon %0.87, 2. istasyon %1.03, 3. istasyon %0.41, 4. istasyon %4.99 olarak bulunmuştur. Dominant doymuş yağ asitleri (SFA) palmitik asit ve stearik asittir. Palmitik asidin en yüksek düzeyi 4. istasyon örneklerinde %40.64, en düşük düzeyi ise 1. istasyon örneklerinde %27.78 olarak bulunmuştur. Stearik asidin en yüksek düzeyi 4. istasyon örneklerinde %12.49, en düşük düzeyi 2. istasyon örneklerinde %2.71 olarak bulunmuştur. ΣSFA düzeyi istasyonlarda sırası ile %36.47, %41.32...

Makale2021MedFAR 76 | 0 Erişime Açık
170387

Antioxidant Capacity and Protein contents of Five Marine Microalgae

Yaman Halil | Eker-Develi Elif | Keles Yuksel

Antioxidant capacity, chlorophyll, marker pigment, and protein contents of four diatoms (Helicotheca tamesis, Haslea silbo, Nitzschia navis-varingica, and Asterionellopsis glacialis) and one cyanobacterium (Spirulina subsalsa) have been investigated. N. navis-varingica exhibited the highest chlorophyll a, fucoxanthin, ascorbic acid, and total antioxidant capacity (TAC) among the five species studied. Cupric-reducing antioxidant capacities of N. navis-varingica and H. silbo were higher than other species studied. A. glacialis exhibited the highest total superoxide dismutase (SOD) activity, H. silbo displayed the highest ascorbate peroxidase (APX) activity, and Spirulina subsalsa had the maximum phenolic and protein contents. Overall, compared to other studies in the literature, the...

166155

Metal pollution status and health risk assessment of beach sediments along the Mersin coast, Turkey

Özbay, Özgür | Akçay, İsmail

In the present study, the ecological risk assessment of metal contamination in beach sediments along the Mersin coast was determined using the metal contents of beach sediments in Mersin, Kızkalesi, Susanoğlu and Taşucu region obtained between 2006 and 2009. Furthermore, the potential health risk assessment for ingestion and dermal contact pathways of adults and children was determined. Ecological risk assessment of heavy metals showed that there is no pollution in the beach sediments for the metals Cu, Pb and Zn for the all studied coasts. However, the high ecological risk indices calculated in this study strongly suggested an apparent Cd, Cr and Ni pollution in the studied beach sediments due to natural and anthropogenic contamination. Study findings indicated the HI values were greater ...

167523

Bacterial agents isolated from cultured marsh frog (Pelophylax ridibundus, Pallas 1771)

Özer, Selmin

Marsh frogs (Pelophylax ridibundus) are preferred in European cuisine. In recent years, interest in farming of marsh frogs has increased, but little is known about their bacterial diseases. This research was carried out in a marsh frog farming operation in Mersin, Turkey, in order to determine the bacterial diversity. For this purpose, a total of 339 frog, 30 water, and 8 feed samples were collected. Isolation and identification of bacteria were carried out by conventional techniques and the VITEK-2 compact system. Antimicrobial susceptibility testing was performed by Kirby-Bauer disc diffusion method. A total of 239 isolates of 49 different species, including 31 Gram negative rod-shaped bacteria, 9 Gram positive rod-shaped sporeforming bacteria, and 9 Gram positive cocci-shaped non-sporef...

167525

Turunç (Citrus aurantium, L.) yaprak ve meyve kabuğu uçucu yağlarının kimyasal bileşenleri, antioksidan ve antibakteriyel etkinlikleri

ÖZER, Selmin, ÇINAR, Fırat

Bu araştırma turunç (Citrus aurantium) meyve kabuğu ve yaprak uçucu yağlarının biyo-yararlılığnın belirlenmesi amacıyla yürütülmüştür. Bu amaçlarla Şubat-Nisan 2020’de turunç ağaçlarının meyveleri ve yaprakları toplanarak hidrodistilasyon yöntemiyle uçucu yağları elde edilmiştir. Uçucu yağların bileşenleri GC-MS (Gaz kromatografisikütle spektrometresi) ve antioksidan aktiviteleri DPPH (2,2-difenil-2-pikrilhidrazil) metotlarına göre yapılmıştır. Antimikrobiyal duyarlılıkları ise antibiyogram (disk difüzyon yöntemi), minimum inhibisyon konsantrasyonu (MİK) (mikrodilüsyon yöntemi) ve minimum bakterisidal konsantrasyonu (MBK) testleri uygulanarak saptanmıştır. Antibakteriyel aktivite testleri iki Gram-negatif basil (Escherichia coli ve Yersinia ruckeri) ve Gram-pozitif kok (Enterococcus fa...

166686

Dream vacations of children: exploring key motivations and preferred experiences by drawing

ÖZKAN BUZLU, Mehtap

Children have an important place in the family travel market as they have a strong influence on holiday decisions and their satisfaction can directly affect their parents’ satisfaction and future behavioural intentions. To attract this market and provide child tourists with a satisfying holiday experience, it is important to better understand their motivations and preferences. The aim of this research is to identify children’s motivations and preferred destinations and activities in family tourism context. In this qualitative study, where children’s voices were taken into account by giving them the opportunity to express their dream family holiday experience ‘drawing’, one of the widely preferred child-friendly techniques to reveal children’s perspectives, was used. A total of 103 literate...

Makale2025Tourism Recreation Research 14 | 0 Erişime Kapalı
170554

Effects of Diazinon on 17β-estradiol, Plasma Vitellogenin and Liver and Gonad Tissues of Common Carp (Cyprinus carpio, L., 1758)

Korkmaz Cengiz | Dönmez Ahmet Erdem

Both sexes of Common carp (Cyprinus carpio) exposed to sublethal concentrations (0.488 mg/L and 0.976 mg/L) of the widely used insecticide diazinon for a period of 7, 15, 30 days and effects on plasma 17β-estradiol (E2), vitellogenin (VTG), gonad and liver tissues were examined. In male carps, 0.488 mg/L and 0.976 mg/L diazinon elevated E2 levels following on the 7, 15 and 30 days. Both concentrations of diazinon elevated VTG levels after 15 days in males. In female carps, 0.976 mg/L diazinon elevated E2 levels after 30 days. However, 0.488 mg/L and 0.976 mg/L diazinon reduced VTG levels in female carps, at the end of experiment. Histopathological examination of liver showed dilatation of the bile ducts and sinusoids, congestion, lymphocytic infiltration, pigment accumulation and necrosis ...

167445

Biometric Features of marbled spinefoot Siganus rivulatus (Forsskål & Niebuhr, 1775) from Mersin Bay (Northeastern Mediterranean), Turkey.

Çiftçi, Nuray | Ayas, Deniz

In the study, it was aimed to determine the morphometric measurements of Siganus rivulatus (Forsskål & Niebuhr, 1775) sampled from Mersin Bay in February 2021. The average value of some morphometric measurements of fish from Mersin Bay (n=196) were found that the total length 17.87 ± 3.11 cm, standard length 13.88 ± 1.96 cm, fork length 17.06 ± 1.35 cm, head length 3.60 ± 0.76 cm, eye diameter 1.08 ± 0.23 cm, interorbital distance 1.60 ± 0.34 cm, body width 2.32 ± 0.48 cm, dorsal fin base length 10.45 ± 2.19 cm, anal fin base length 6.26 ± 1.31 cm, pectoral fin length 2.56 ± 0.53 cm and caudal peduncle height 0.78 ± 0.16 cm. The total length-weight relationship of the species was determined as W = 0.008xTL3.16 (r2=0.973) and it was found that the fish showed positive allometric grow...

170578

Mersin Bolgesinde Yetistiriciligi Yapilan Bazi Akvaryum Baliklari Poecilidae nda Rastlanilan Lernea cyprinaceae Linnaeus 1758 Enfeksiyonu

Cafer Erkin Koyuncu, Ahmet Erdem Dönmez

Bu araştırma Nisan - Ağustos 2002 tarihleri arasında Mersin Bölgesi’nde bir akvaryum işletmesinde Poecilidae familyasına ait balıklarda görülen ani ölümlerin nedenini ortaya koymak amacıyla yapılmıştır. Balıkların deri, yüzgeç ve solungaç dokularından alınan parazitler laboratuvarda incelenmesi sonucunda ölümlere neden olan etmenin Lernaea cyprinacea (Linnaeus, 1758) olduğu tespit edilmiştir. Araştırmada 110 adet balık incelenmiş olup, bunlardan 49 adetinin parazit ile enfeste olduğu saptanmıştır. Ayrıca parazitin morfolojik özellikleri ve balıklarda oluşturduğu semptomlar incelenmiştir. Balıklar Kloramin T (10 ppm / 1 saat / 3 gün) kullanılarak tedavi edilmiştir

166166

Ulva intestinalis (Linnaeus 1753) ve Sargassum vulgare (F. Furcatum (Kützing) J. Agardh1889) Ekstraktlarının Bazı Patojen Mikroorganizmalar Üzerindeki Antimikrobiyal Etkileri

Alp, Mehmet Tahir | Ayas, Deniz

Makroalgler biyolojik aktivitelerinden dolayı önemli bir yere sahiptir. Makroalglerin antimikrobiyal özelliklerinin belirlenmesi amacıyla yaptığımız çalışmada, yeşil algler (Chlorophyta)’den Ulva intestinalis, kahverengi algler (Phaeophyceae)’den Sargassum vulgare türleri kullanılmıştır. Ekstraksiyon olarak aseton, etanol, kloroform ve metanol kullanılarak makroalglerin kuyucuk difüzyon ve spektrofotometrik broth mikrodilüsyon yöntemi ile gram pozitif bakteri suşlarından Staphylococcus aureus, Enterococcus faecalis, gram negatif bakteri suşlarından Escherichia coli ve Klebsiella pneumoniae’e ve maya olarak da Candida parapsilosis ve Candida tropicalis’e karşı antimikrobiyal aktivitelere bakılmıştır. Sonuç olarak, antimikrobiyal aktivite değerleri yönüyle baktığımızda Sargassum vulgare (0.3...

167559

New locality record for Fistularia petimba Lacepède, 1803 from the NortheasternMediterranean Sea (Mersin Bay)

Çiftçi, Nuray | Ayas, Deniz

Fistularia petimba distributes in tropical and subtropical waters of Atlantic and Indo-Pacific. In this research, two individuals belonging to F. petimba were caught in a trawl operation carried out in Mersin Bay in May 2018. Necessary morphometric measurements were taken to prevent misconceptions in the identification of the species and it was determined that morphometric measurements in the captured individuals were consistent with the measurements of the specimens in the previous studies. It is believed that F. petimba entered the Northeastern Mediterranean Sea from the Red Sea. This species is posing a threat to the Mediterranean ecosystem as a predator and its invasion capacity is discussed

167492

Effects of Dietary L-carnitine Supplementation on Growth, Muscle Fatty acid Composition and Economic Profit of Rainbow Trout (Oncorhynchus mykiss)

HUNT, ARZU ÖZLÜER

In this study, the effect of dietary L-carnitine on growth, proximate and muscle fatty acid compositions of rainbow trout (Oncorhynchus mykiss) were investigated. The fish were fed with diets containing 300 mg kg-1 L-carnitine (LC300), other group was fed with diets containing 600 mg kg-1 L-carnitine (LC600) and control group was not supplementary L-carnitine for 63 days. The weight gain of LC600 fed with L-carnitine supplemented was found to be 7.73% higher than in control group. Feed conversion ratio in LC600 (1.66) and LC300 (1.60) is better than in control group (2.00). L-carnitine supplemented groups would be lower cost of production than control. Economic conversion ratio (ECR) of LC300 (2.71 US.$ kg-1) would represent a saving of 0.44 US.$ kg-1 compared to the control. L-carni...

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