Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleYalnız künye2021Effect of Beta-Cyfluthrin Pesticide on Zebra Mussel (Dressienna polymorpha)
Serdar, Osman; Aydin, Rahmi; Söylemez, Hilal
In this study, some biochemical responses of Beta-Cyfluthrin (β-CF), which is a commercial insecticide in Dreissena polymorpha, were investigated. The 96 hour LC50 value of β-CF on D. polymorpha was calculated as 509.62 µg L-1. D. polymorpha was exposed to subletal concentrations (1/16, 1/8 and 1/4 of LC50 value: 32, 64 and 128 µg L-1) of β-CF for 24 and 96 hours. Malondialdehyde (MDA) and reduced glutathione (GSH) levels and Acetylcholinesterase (AChE) enzyme activities were determined in D. polymorpha individuals. In D. polymorpha exposed to β-CF, MDA levels increased compared to control and with increasing concentration. It was determined that GSH level decreased and AChE activity was inhibited compared to control and with increasing concentration. In conclusion, exposure to β-CF resulted in increased oxidative damage and has been found to cause neurotoxicity even at low concentrations.
AtıfOpenAlex8TR Dizin4
İncele - MakaleAçık Erişim2021Some Growth Parameters of Capoeta umbla (Heckel, 1843) Population Living In The Pülümür River
Serdar, Osman; Ozcan, Ebru Ifakat
In this study, some growth parameters have been investigated like sex distribution, length and weight relationship, age determination, von Bertalanffy growth parameters and condition factor of Capoeta umbla (Heckel, 1843) (644 female, 743 male) captured from Pülümür River between 2017 and 2019. Females varied from 7.1 to 38.8cm in total length and 3.4 to 514.2 g in weight. Males varied from 7.3 to 38.3cm in total length and 3.5 to 450.4g in weight. The sex ratio (females/males) for C. umbla was 1:1.154. The age groups for C. umbla was 0-11. The von Bertalanffy growth parameters were determined as Lt=49.25[1-e-0.128(t+1.68)]; Wt=666.91[1-e-0.128(t+1.68)]2.973 for female, Lt=44.42[1-e-0.155(t+1.37)]; Wt=735.19[1-e-0.155(t+1.37)]2.954 for male and Lt=45.29[1-e-0.146(t+1.42)]; Wt=772.56[1-e-0.146(t+1.42)]2.963 for all individuals. The growth performance index (Ф') value was determined as 2.476. The length and weight relations of C. umbla were found as W=0.0096*L2.973, R2=0.97 (95 % CI of b=2.773-3.139) for females; W=0.0103*L2.954, R2=0.98 (95 %CI of b=2.797-3.092) for males and W=0.0100*L2.963, R2=0.98 (95 %CI of b=2.773-3.139) for all individuals. The growth type of C. umbla was isometric for all individuals (R=0.99, R2=0.97, F1,1385=51700.4, P
AtıfOpenAlex6TR Dizin4İncele - MakaleYalnız künye2021Scopus SJRQ2The assessment of basic blue 41 textile dye decolorisation using the Fenton process: response surface methodology optimisation and toxicity evaluation
Tanyol, Mehtap; Cikcikoglu Yildirim, Nuran; Tatar, Sule; Serdar, Osman; Yildirim, Numan
The biochemical biomarkers (Catalase (CAT), glutathione s-transferase (GST), cytochrome P4501A1 (CYP1A1450) activities and glutathione (GSH), malondialdehyde (MDA) levels) of D. polymorpha exposed to the basic blue 41 (BB41) solutions for 24 and 96 h before and after the Fenton process (FTP) were evaluated to investigate the efficiency of the FTP. The optimum conditions for the removal of BB41 were set using central composite design (CCD), which is a response surface methodology (RSM) module in the Design-Expert® software. The optimal conditions were found to be 27.87 min, 3.49 mg/L, and 0.04 for reaction time, initial BB41 concentration, and Fe2+/H2O2 molar ratio, respectively, resulting in maximum (99%) removal efficiency. After FTP, the MDA and GSH levels decreased significantly during the 24 and 96 h. CAT activities were increased after treatment. No statistically significant changes were observed in the CYP1A1 levels after FTP. GST activities decreased during 24 h but increased during 96 h after FTP. CYP1A1450, catalase, GST activities and MDA, GSH levels of D. polymorpha are useful biomarkers to evaluate the efficiency of FTP. This study suggests that BB41 dye must be further treated after the FTP to minimise the ecotoxicological risk.
AtıfScopus8WoS6OpenAlex8
İncele - MakaleYalnız künye2021Scopus SJRQ1Evaluation of the efficiency of chlorpyrifos-ethyl remediation by Methylobacterium radiotolerans and Microbacterium arthrosphaerae using response of some biochemical biomarkers
Onder Erguven, Gokhan; Tatar, Şule; Serdar, Osman; Yildirim, Nuran Cikcikoglu
This study reveals out detoxifying and antioxidant enzyme response of Gammarus pulex exposed/polluted to chlorpyrifos-ethyl insecticide before and after biodegradation/bioremediation by Methylobacterium radiotolerans and Microbacterium arthrosphaerae. Cytochrome P450 1A1, glutathione S-transferase, catalase, and superoxide dismutase activities in G. pulex exposed to chlorpyrifos-ethyl before and after bioremediation/biodegradation by these two bacteria during 24 and 96 h tested by using commercial ELISA kits. The activity of catalase enzyme was decreased depending on chlorpyrifos-ethyl before and after bioremediation/biodegradation the enzyme activity was increased repeatedly. Superoxide dismutase activity level increased after chlorpyrifos-ethyl exposure in 96 h (p > 0.05). Following bioremediation, superoxide dismutase enzyme activity decreased again during 24 h (p > 0.05) and increased during 96 h (p < 0.05). Statistical differences were not found in cytochrome P450 1A1 enzyme activity before and after the process (p > 0.05). No significant differences were determined during the activity of glutathione S-transferase in 24 h (p > 0.05). The activities of glutathione S-transferase were increased after exposure of chlorpyrifos-ethyl during 96 h. After bioremediation; the activity of glutathione S-transferase increased even more (p < 0.05). The results determined that activities of G. pulex at superoxide dismutase, catalase, and glutathione S-transferase are common biomarkers for revealing out the efficiency of bioremediation of chlorpyrifos-ethyl with these two types of soil bacteria. [Figure not available: see fulltext.]
AtıfScopus15WoS14OpenAlex16
İncele - MakaleAçık Erişim2021Scopus SJRQ1Ameliorative effect of Fennel (Foeniculum vulgare) essential oil on chlorpyrifos toxicity in Cyprinus carpio
Pala, Ayşegül; Serdar, Osman; Mişe Yonar, Serpil; Yonar, Muhammet Enis
Chlorpyrifos (CPF) is an organophosphate pesticide that is frequently and widely used to control both agricultural and domestic pests worldwide. In this study, the protective effect of Fennel (Foeniculum vulgare) essential oil (FEO) was investigated in carp (Cyprinus carpio) exposed to CPF. The fish were divided into six groups that one control group (no treatment) and five experimental groups (FEO (3ml/100g diet) group, CPF1 (0.023 mg/l) group CPF2 (0.046 mg/l) group, CPF1 (0.023 mg/l) plus FEO (3ml/100g diet) group, CPF2 (0.046 mg/l) plus FEO (3ml/100g diet) group). Blood and tissue (liver, kidney, gill, and brain) samples were taken from the fish at the end of 14 days of application. Hemoglobin (Hb) level, nitoblue tetrazolium (NBT) activity, and total immunoglobulin (TI) level were measured in blood samples of fish. Acetylcholinesterase (AChE) activity was determined in brain tissue while malondialdehyde (MDA) level, reduced glutathione (GSH) level, catalase (CAT), and glutathione peroxidase (GPx) activity were determined in liver, kidney, and gill tissues. The results showed that there was a significant decrease in Hb level, NBT activity, and TI levels in CPF-treated fish compared to the control group. In addition, increased in MDA levels and significant decreases in GSH level, AChE, CAT, and GPx activities were observed in CPF-treated groups. However, FEO-treated was showed a significant improvement in all parameters except AChE activity compared to CPF groups. These study findings showed that FEO could improve CPF-induced toxicity in C. carpio, except inhibition of AChE activity.
AtıfScopus6WoS6OpenAlex8İncele - MakaleAçık Erişim2020Malathionun Gammarus pulex (Tatlı Su Amphipodu)’te Asetilkolinesteraz Aktivitesi Üzerine Akut Etkisi
Serdar, Osman; Pala, Ayşegül; Aydin, Rahmi
Bu çalışmada, organofosfat insektisit malathionun subletal konsantrasyonlarının Gammarus pulex'in AChE aktivitesi üzerine akut (24 ve 48 saat) etkisi incelenmiştir. Bu amaçla, G. pulex'e malathionun iki farklı sublethal konsantrasyonu (0.1 ve 0.2 mg l-1 ) 24 ve 48 saat boyunca uygulandı. 24 ve 48 saat malathion maruziyetinin sonunda G. pulex örnekleri alındı. Alınan örneklerde AChE enzim aktivitesi ve protein düzeyi belirlenerek, spesifik AChE enzim aktivitesi hesaplandı. Malathionunun sublethal konsantrasyonları G. pulex'te AChE aktivitesininin zamana bağlı artan inhibisyonuna neden oldu. 0.1 mg l-1 malathion konsantrasyonuna maruz kalan grupta, AChE'nin inhibisyonu, kontrol ile karşılaştırıldığında, 24 saatte %50 ve 48 saatte %74 olarak tespit edildi. Benzer şekilde, 0.2 mg l-1 malathion konsantrasyonuna maruz kalan grupta da kontrol ile karşılaştırıldığında sırasıyla 24 ve 48 saatte % 60 ve % 68 AChE inhibisyonu gözlendi. Sonuç olarak, G. pulex'in malathiona 24 ve 48 saat boyunca maruz kalması AChE aktivitesinin yüksek oranda inhibe edilmesine neden olmuştur. Ayrıca, sonuçlar G.pulex'teki % 74'e kadar AChE inhibisyon seviyelerinin akut ölüme neden olmadığını ve G. pulex'teki AChE aktivitesinin ölçümünün akut malathion maruziyetinin ve etkilerinin biyobelirteci olacağını göstermektedir.
AtıfOpenAlex3TR Dizin1İncele - MakaleYalnız künye2020Scopus SJRQ2Can Toxicities Induced by Insecticide Methomyl be Remediated Via Soil Bacteria Ochrobactrum thiophenivorans and Sphingomonas melonis?
Tatar, Sule; Yildirim, Nuran Cikcikoglu; Serdar, Osman; Erguven, Gokhan Onder
The research study was about revealing the biochemical response of Gammarus pulex related to insecticide methomyl before and after bioremediation by two soil bacteria species, Ochrobactrum thiophenivorans and Sphingomonas melonis. Catalase (CAT), glutathione S-transferase.(GST), cytochrome. P4501A1 (CYP1A1) activities in G. Pulex related to methomyl solution were investigated in 24 h and 96 h. ELISA method was used for test studies. CAT enzyme was decreased in Gammarus pulex that was exposed to methomyl after all exposure period (P < 0.05). CAT activities were returned to control results after bioremediation assays. GST enzyme activity was decreased depending on methomyl exposure during 24 h but increased during 4 days (P < 0.05). After 8 days of bioremediation period, GST activity increased again during 24 h while decreased during 4 days (P < 0.05). CYP1A1 activity increased in Gammarus pulex that was exposed to methomyl after all exposure period (P > 0.05). After bioremediation, statistically significant changes were not revealed in CYP1A1 activities (P > 0.05). According to the results of our study, CYP1A1, CAT, and GST activities in G. pulex sanctioned the capability of Ochrobactrum thiophenivorans and Sphingomonas melonis in methomyl bioremediation. Isolated and enriched Ochrobactrum thiophenivorans and Sphingomonas melonis that were added to 2.5 ppb concentrations of methomyl for 8 days. Each day, chemical oxygen demand (COD) and biochemical oxygen demand (BOD5), pH and dissolved oxygen parameters were monitored. At the final phase of the bioremediation step, it was determined that these bacteria have efficient methomyl bioremediation properties in a mixed corsortia at a rate of 86%. These results show that these bacteria can be used for bioremediate the receiving environments that are polluted by these kinds of insecticides.
AtıfScopus18WoS16OpenAlex19İncele - MakaleYalnız künye2020Scopus SJRQ4Examining the biochemical effect of malathion pesticide on gammarus pulex (l., 1798)
Yukse, Fahrettin; Aydin, Rahmi; Serdar, Osman; Pala, Avsegul
This study determined the effect of a pesticide with malathion as active substance on Gammams pulex in terms of oxidative stress and antioxidant status. Firstly, 96-hours LC50 value of malathion on G. pulex was determined. Then, the organisms were exposed to determined sublethal concentrations (at the rate of 1/40, 1/20 and 1/10 LC50 value) of malathion for 24 and 96 hours. Thiobarbituric Acid Rcactive Substances (TBARS), rcduccd glutathione (GSH) levels, superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) enzyme activities in the control group and samples that were exposed to malathion for 24 and 96 hours were determined. The results showed that TBARS level significantly increased in G. pulex that was exposed to malathion for 24 and 96 hours compared to the control group (p <0.05). However, GSH level, SOD, CAT and GPx activities dccrcascd (p <0.05). Malathion exposure caused oxidative stress in G. pulex. These results revealed that MDA, GSH levels, SOD, CAT and CiPx activities can be used as effective biomarkcrs in G. pulex.
AtıfScopus1İncele - MakaleYalnız künye2020Scopus SJRQ2Temporal and seasonal variations in phytoplankton community structure in Uzuncayir Dam Lake (Tunceli, Turkey)
Kutlu, Banu; Aydın, Rahmi; Danabas, Durali; Serdar, Osman
Seasonal variations in species composition and growth dynamics of phytoplankton in Uzuncayir Dam Lake (Tunceli, Turkey) were studied in relation to ecological factors by collecting horizontal water and phytoplankton samples for over a year. A total of 46 phytoplankton taxa were recorded, where Bacillariophyta was the most abundant in species number representing 24 taxa. Diatoms were the most conspicuous phytoplankton in terms of abundance as well as occurrence frequency. Charophyta, Chlorophyta, Cyanobacteria, Ochrophyta, Miozoa, and Euglenozoa were the least abundant. However, some Diatoms (Gyrosigma attenuatum, Hippodonta hungarica, Meridion circulare, Nitzschia clausii, Nitzschia frustulum, Pantocsekiella ocellata, Rhoicosphenia abbreviata), Charophytes (Cosmarium granatum, Mougeotiopsis calospora), Cyanobacteria (Leiblenia epiphytica, Planktothrix agardhii); Dinoflagellates (Ceratium hirundinella, Parvodinium africanum, Parvodinium inconspicuum, Peridinium cinctum), and Ochrophyta (Dinobryon pediforme) were also noticeable, with their occurrence in all seasons. Canonical correspondence analysis (CCA) and principal component analysis (PCA) were employed to analyze the relationship between occurrence and abundance of phytoplankton species as well as the ecological factors. The results showed that pH and the concentrations of NH4, NO3, and PO4 influenced seasonal occurrence and abundance of phytoplankton species in the lake. Uzuncayir Dam Lake may be classified as an oligotrophic lake with the mean value of nitrate 2.62 mg L−1 and phosphate 0.23 mg L−1 as supported by the occurrence of various phytoplankton groups. Findings related to pollution indices yielded that Uzuncayir Dam Lake is on the edge of the moderate state of organic pollution.
AtıfScopus26WoS15OpenAlex23İncele - MakaleAçık Erişim2019Karasu Nehri’nde (Doğu Anadolu, Türkiye) yaşayan Chondrostoma regium (Heckel, 1843)’un bazı büyüme parametreleri
Serdar, Osman; Ozcan, Ebru Ifakat
Bu çalışma, Karasu Nehri’nin 14 farklı istasyonunda yaşayan kababurun (Chondrostoma regium (Heckel, 1843))’un yaş tayini ve bazı büyüme özelliklerinin araştırılması ile ilgilidir. Bu amaçla, 2014 ve 2016 yılları arasında elektroşokerle toplam 236 C. regium balık örneği (124 dişi ve 112 erkek) yakalandı. Örneklenen C. regium bireylerinin total boy ve ağırlığı sırasıyla 11,0-33,0 cm ile 33,0-324,0 g arasında değiştiği görülmüştür. İncelenen bireylerin yaşlarının 1-7 arasında değiştiği görülmüş ve dişi:erkek oranı 1:0.903 olarak belirlenmiştir. von Bertalanffy büyüme parametreleri tüm bireyler için Lt=40,17[1-e-0,154(t+2,14)]; Wt=495,009[1-e-0,154(t+2,14)]2,50 ve büyüme performans indeks değeri (Ф') ise 2,395 olarak hesaplanmıştır. İncelenen populasyon için boy-ağırlık ilişkileri ise W=0,0503L2,50 (R² = 0,97; b’nin güven aralıkları=2,41-2,70; p<0,001) şeklinde bulunmuştur. Bu değerlere göre, C. regium’un büyüme tipinin negatif allometrik özellik gösterdiği görülmüştür.
AtıfOpenAlex3TR Dizin1İncele - MakaleYalnız künye2019Changes in Antioxidant and Detoxification Systems of the Freshwater Amphipod Gammarus pulex Exposed to Congo Red
Serdar, Osman; Tatar, Sule; Cıkcıkoğlu Yıldırım, Nuran
In this study, it is aimed to investigate the changes in glutathione S-transferase and cytochrome 1A1 enzymes with malondialdehyde levels in Gammarus pulex exposed to congo red. G. pulex was exposed to synthetic solutions containing 20, 10, 5 mg/L of congo red during 96 hours. Glutathione S-transferase and cytochrome 1A1 enzyme activities were determined by using ELISA kit, malondialdehyde levels were determined spectrophotometrically. Glutathione S-transferase activities groups increased in all application groups during 24 and 96 hours compared to control (P<0.05). After exposure to congo red, cytochrome 1A1 activity was decreased during 24 and 96 hours in all application groups compared to control groups (P<0.05). Malondialdehyde levels increased in all groups after congo red exposure compared to control during 24 hours (P<0.05), after 96 hours increased in group A, decreased in groups B and C (P<0.05). Our results show that congo red may cause oxidative stress by producing reactive oxygen species. In conclusion, changes in antioxidant enzymes and malondialdehyde levels suggest that congo red can be used as potential sensitive biomarkers in the assessment of environmental toxicity.
AtıfTR Dizin3İncele - MakaleYalnız künye2019Antioxidant Enzyme Responses to Lead Exposure of Gammarus pulex
Serdar, Osman; Yildirim, Numan; Tatar, Sule; Cıkcıkoğlu Yıldırım, Nuran
It is aimed to investigate the activity response of the antioxidant enzymes superoxide dismutase, catalase and glutathione peroxidase of G. pulex exposed to lead. The G. pulex was exposed synthetic solutions containing 10, 30, 50 µg/L lead for 96 h. Superoxide dismutase, catalase, glutathione peroxidase activities were determined by using ELISA kit. The differences in superoxide dismutase activities were statistically insignificant (P>0.05). Catalase decreased in all treatment groups after lead exposure (P<0.05). The glutathione peroxidase activities were decreased depending on lead exposure (P>0.05). Our findings suggest that lead can induce oxidative stress by generating reactive oxygen species and inhibiting sulfhydryl dependent antioxidant enzymes activities. In conclusion, alterations in antioxidant enzymes may potentially be used as sensitive biomarkers for risk assessment of lead in the environment and may contribute to the establishment of discharge regulations.
AtıfTR Dizin1İncele - MakaleYalnız künye2019The Evaluation in Different Temperature of Acute Toxic Effect of Cadmium on Gammarus pulex (Freshwater Amphipoda)
Serdar, Osman; Çalta, Metin; Aydin, Rahmi
In this study, the LC50 values of the cadmium (Cd) toxicity on the Gammarus pulex were investigated. In this study, it wasaimed to determine the change of LC50 values of Cd at G. pulex at 10, 14 and 18°C.The lethal concentration (LC50) values for G. pulex whichwere exposed to various Cd concentrations for 96 hours were determined at different temperatures as 10, 14 and 18ºC. LC50 values obtained byprobit analysis were found to be; 51.79 ± 1.2 µg L-1for 10ºC, 47.67 ± 0.6 µg L-1for 14ºC and 33.93 ± 0.6 µg L-1for 18ºC. LC50 values werefound to decrease due to the increase in temperature.
AtıfTR Dizin2İncele - MakaleAçık Erişim2019Age and some growth parameters of Squalius cephalus (Linnaeus, 1758) inhabiting Karasu River (East Anatolia, Turkey)
Özcan, Ebru Ifakat; Serdar, Osman
The present study was carried out concerns a research of the age determination and some growth parameters of chub, Squalius cephalus (Linnaeus, 1758) living in 14 different station from Karasu River (East Anatolia, Turkey). For this purpose, a total of 196 fish specimen (100 females and 96 males) of S.cephalus were captured between 2014 and 2016 by electroshocker. Female/male ratio was 1/0.96. Minimum-maximum length and weight of captured fishes were determined as 7.6-23.9 cm and 4.8-198.2 g, respectively. The age groups were determined between 0 and 6. The parameters of von Bertalanffy growth function estimated as L-infinity=31.98 cm, k=0.136 year(-1), t(0)=-1.40 year for all individuals. The growth performance index (phi>) value was computed as 2.143. The length and weight relationships W=0.0060L(3.27) (R-2=0.98) for all individuals. Significant statistical differences in condition factors between age groups and sexes were not found (P > 0.05, t-test).
AtıfWoS1OpenAlex3TR Dizin5İncele - MakaleYalnız künye2019Scopus SJRQ2The effect of dimethoate pesticide on some biochemical biomarkers in Gammarus pulex
Serdar, Osman
In this presented study, it was aimed to determine the effects of pesticides on non-target organisms on the freshwater amphipod, Gammarus pulex, by biochemical responses. Acute toxicity value (LC50) in G. pulex of the dimethoate pesticide was determined. The superoxide dismutase (SOD), glutathione S-transferaz (GST), glutathione peroxidase (GPx), and catalase (CAT) activities and malondialdehyde (MDA), glutathione (GSH) levels of the G. pulex organism exposed to the subletal concentrations were analyzed by ELISA for 24 and 96 h. In conclusion, the present study demonstrated the abilities of dimethoate pesticide induce to oxidative stress. The results revealed that MDA, GSH levels SOD, CAT, GPx, and GST activities of G. pulex can be used as an effective biomarkers.
AtıfScopus47WoS43OpenAlex59İncele - MakaleYalnız künye2019Scopus SJRQ2Modelling cadmium bioaccumulation in Gammarus pulex by using experimental design approach
Serdar, Osman; Pala, Aysegul; Ince, Muharrem; Onal, Ali
Recently, although dynamic approaches have been used increasingly to describe metal bioaccumulation in aquatic organisms, the validation of such laboratory-derived modelling is rarely assessed under environmental conditions. The present study aims to evaluate and verify statistical and mathematical models for the bioaccumulation of cadmium (Cd) and to evaluate the suitability of Gammarus pulex as a biomonitor for Cd. To optimise Cd2+ ion bioaccumulation conditions a Box–Behnken design was used and whether G. pulex can be used as an estimated tool to assess aquatic quality was investigated. A Box–Behnken experimental design combined with response surface modelling (RSM) was employed for Cd2+ bioaccumulation in G. pulex. Independent variables including temperature, contact time and Cd2+ ion concentration significance and their interactions were tested using analysis of variance. The selected variables’ optimum values were obtained by solving the quadratic regression model along with by analysing the response surface contour plots. Based on Box–Behnken design, the applied model is significant because model F-value and R2 were obtained as 5121.49, 0.9998, respectively. Bioaccumulation of Cd amount was analysed using electrothermal atomic absorption spectrophotometer. The obtained data suggest that G. pulex can be evaluated as Cd biomonitor.
AtıfScopus3WoS3OpenAlex6İncele - MakaleYalnız künye2019Scopus SJRQ2Gammarus pulex as a Model Organism to Assess the Residual Toxicity of Slaughterhouse Wastewater Treated by Electrocoagulation Process
Yildirim, Nuran Cikcikoglu; Tanyol, Mehtap; Serdar, Osman; Yildirim, Numan
It was assessed the efficiency of the electrocoagulation (EC) in slaughterhouse wastewater (SW) treatment by using antioxidant parameters of Gammarus pulex. The SW was treated by EC. Superoxide dismutase (SOD), glutathione peroxidase (GPx) and catalase (CAT) activities and malondialdehyde (MDA) levels in G. pulex exposed to pre- and post-treated of the SW during 24 h and 96 h were analysed. Standard methods were applied during the analysing process of the physicochemical quality parameters for both untreated and treated SW. All measured physicochemical parameters were decreased following the treatment process via EC. After the treatment process, it was observed that while SOD activities and MDA levels were decreased, CAT activities were increased and GPx activities did not exhibit any change. In conclusion, the present study demonstrated the abilities of untreated SW to promote oxidative stress in model organism. The SOD, CAT activities and MDA levels in G. pulex revealed that EC process were efficient in the SW treatment.
AtıfScopus10WoS9OpenAlex13İncele - MakaleYalnız künye2019Scopus SJRQ4Evaluation of a new computer method (ANNs) and traditional methods (LWRS and VBGF) in the calculation of some growth parameters of two cyprinid species
Ozcan, Ebru Ifakat; Serdar, Osman
Artificial Neural Networks (ANNs) are a very reliable computer program used in many areas such as growth parameters. The aim of this study to compare the growth estimates of tigris scraper (Capoeta umbla (Heckel, 1843)) and kura barbel (Barbus lacerta (Heckel, 1843) captured from Karasu River (East Anatolia, Turkey) between 2014 and 2016. The age groups were 0-9 for C. umbla and 0-8 for B. lacerta. The estimated parameters of von Bertalanffy growth equations were as L' =51.96 cm, W' 804.16 g, k=0.092 year-1, t0=-1.763 year for C. umbla and L' 32.23 FP, W' 435.87 J, k 0.127\HDU-1, t0-2.489 for B. lacerta. The growth performance index (Y) value was comput-ed as 2.395 for C. umbla and 2.120 for B. lacerta. The length and weight relationships for two fish species were as follows: W=0.0092L3.05 (R²=0.98) and W=0.0095L3.07 (R2=0.98). The growth of these two cyprinid species were isometric growth. A ANNs model is a interdepented system containing many neurons. There are three different layers in a neural network (input, hidden and output layers). Data enters (length/weight, age, sex) at the inputs and passes along the network, by layer, till it reach-es at the outputs (weight/length). MATLAB Ver R2016a (Neural Network Toolbox) was used for ANNs estimatings. MAPE (%) equation was used to compare ANNs and other methods. According to the comparison of the results obtained with MAPE (%), ANNs provide better results than the LWRs and VBGF. The results of this study could give useful insight that ANNs can be evaluated as an alternative for growth prediction.
AtıfScopus9İncele - MakaleAçık Erişim2019Scopus SJRQ4Modeling approach with Box-Behnken design for optimization of Pb bioaccumulation parameters in Gammarus pulex (L., 1758)
Pala, Aysegul; Serdar, Osman; Ince, Muharrem; Onal, Ali
The aim of this research was to evaluate the suitability of Gammarus pulex (L., 1758), an amphipod crustacean, as a bio-monitor for lead (Pb). A Box– Behnken experimental approach combined with response surface modeling (RSM) and quadratic programming was employed to increase the knowledge about Pb2+ bioaccumulation in Gammarus pulex (L., 1758). Independent variables, such as temperature ranging from 18 to 22 ºC, contact time from 8 to 48 hours, and Pb2+ ion solution concentrations from 50 to 100 µg L-1, were studied and tested using analysis of variance (ANOVA). The standardized effects of the independent variables and their interactions on the dependent variable were also investigated according to a Pareto chart. The selected variables' optimum values were obtained by solving the quadratic regression model along with analyzing the response surface contour plots. Optimum experimental conditions were obtained at 22.0 ºC, contact time of 8 hours, and Pb concentration at 69.5 µg L-1. Based on the Box-Behnken design, the applied model is significant because the model F-value and R2 were obtained at 77.80 and 0.9901, respectively. Bioaccumulation of Pb was determined using electrothermal atomic absorption spectrometry (ETAAS). The obtained data suggest that G. pulex can be used as a Pb biomonitor.
AtıfScopus4WoS6OpenAlex6İncele - MakaleAçık Erişim2018Length–Weight, Length–Length Relationships and Condition Factor of Chondrostoma regium (Heckel, 1843) and Barbus lacerta, Heckel, 1843 From Karasu River (East Anatolia, Turkey)
Serdar, Osman; Ozcan, Ebru Ifakat
Length–weight, length–length relationships and condition factors were estimated for twofish species (Chondrostoma regium, Barbus lacerta) caught between October 2014 andSeptember 2015 in the 14 distinct locations of Karasu River, East Anatolia, Turkey.Minimum and maximum total length and weight were observed at 7.5 to 31.0 cm andfrom 5.7 to 280 g for C. regium, 7.0 to 24.0 cm and from 4.0-211 g for B. lacerta. The bvalues determined as 2.77 for Chondrostoma regium; 3.10 for Barbus lacerta. The typesof growth were found negative allometric for C. regium and isometric growth for B.lacerta. The length-length relations between total, fork, and standard lengths for the twofish species were highly significant. The relative condition factor values were found to1.102±0.013 for C. regium; 1.176±0.019 for B. lacerta. This study submits for the firsttime LWR, LLR and condition factor of two species in the Karasu River.
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