Browsing by Author "Karaca, S."

Now showing 1 - 8 of 8

Determination of Soil Moisture and Temperature Regimes With the Newhall Simulation Model: Example of Van Province
(Centenary University, 2022) Karaca, S.; Sarğin, B.
The aim of this study was to determine Van province and districts soil, temperature, and humidity regimes, which contain different geographical and climatic characteristics, with the Newhall Simulation Model. In the study, long-term average precipitation and temperature data obtained from Van center,Bahçesaray, Başkale, Çaldıran, Çatak, Erciş, Gürpınar, Gevaş, Muradiye, Özalp and Saray meteorological stations were used. In addition, Thorntwhaite and Erinç climate classifications were used to find the climate classification of the province and districts. Looking at the Thornthwaite climate classification, Bahçesaray and Çatak districts are in the region's southwest and in the semi-humid climate class. In contrast, the other locations show semi-arid climate characteristics. According to the Erinç climate classification, Bahçesaray, Çatak, and Muradiye are classified as semi-humid, Gürpınar in the arid climate class, and the districts located in the northern and eastern parts of the province are categorized as semi-arid. With the Newhall Simulation model, the soil temperature regime of the province and all districts was determined as "Mesic." The moisture regime of the soil of Bahçesaray, Çatak, Gevaş, and Muradiye districts and the Van region was seen as Dry Xeric. The soil moisture regime of Başkale, Çaldıran, Erciş, Gürpınar, Özalp and Saray districts was found to be "Typic Aridic". Calculation of the soil water budget, determination of water deficiency, and preparation of drought action planning will be beneficial in the effectiveness of all necessary physical, chemical, and biological activities of the soil and in determining the groups in soil classification. © 2022, Centenary University. All rights reserved.
The Effects of Gyttja on Soil Properties in Nickel-Contaminated Soils
(Aloki Applied Ecological Research and Forensic inst Ltd, 2019) Karaca, S.; Gulser, F.; Sonmez, F.; Gokkaya, T. H.
In this study, the effects of gyttja on some soil properties in two different nickel-contaminated soils (Inceptisol and Entisol) were investigated. This study was conducted with the application of three levels of gyttja (0, 5 and 10%) in two different soils (Inceptisol and Entisol) contaminated with Ni at three levels of concentration (0, 40 and 80 mg kg(-1)) in a factorial experimental design with three replications. Some soil properties showed differences in different nickel and gyttja applications. Soil nickel content significantly (P < 0.01) increased in nickel-contaminated soils. Soil organic matter and phosphorus contents in gyttja applicated soils were found to reach higher levels compared to those without gyttja application.
Evaluation of Predictive Ability of Two Artificial Neural Network Algorithms and Multiple Regression Model for Meat Quality Traits Affected by Pre-Slaughter Factors
(Pakistan Agricultural Scientists Forum, 2021) Ser, G.; Bati, C. T.; Arik, E.; Karaca, S.
Recently, Artificial Neural Network (ANN) has been developed as an alternative to classical statistical methods in animal production. The methods can do classification or prediction by analyzing the information in the data set with the help of the neural network without requiring any preconditions (for example, distribution of data, non-linear data, highly correlated variables, etc.). In this context, we hypothesized that ANN, which is not only used in large and complex data sets but also estimates better in small data sets compared to classical statistical methods. The ability of ANN of Bayesian Regularization (BR-ANN) or Levenberg-Marquardt (LM-ANN) algorithms and Multiple Regression (MR) model to predict meat quality traits were assessed in a comparative study. The multilayer ANN algorithms obtained prediction data of meat quality measurements from pre-slaughter information using 1, 2, 4, 6 and 8 neurons in the hidden layer applied 10 times for each model. The performance of the methods was assessed according to the coefficient of determination (R-2) criteria, root mean squared error (RMSE) and residual prediction deviation (RPD). The comparison of the findings of BR-ANN and ML-ANN algorithms showed a similar ability to predict meat quality traits (error of prediction and R-2 values between 0.32-2.72 and 0.19-0.49, respectively). However, MR model predictions had lower performance than ANN algorithms, resulting in a wider error of prediction interval (0.4-3.44) and low R-2 (0.16-0.44). The RPD for meat quality traits was fair for BR-ANN and LM-ANN but was poor for MR. Based on our results, the ANN algorithms produced more reasonable prediction values than the MR model. ANN algorithms can be used as an acceptable alternative method for simple physical measurements of meat quality. ANN algorithms can be used reliably in small data sets.
Evaluation of Sensory Characteristics of Sheep and Goat Meat by Procrustes Analysis
(Czech Academy Agricultural Sciences, 2012) Keskin, S.; Kor, A.; Karaca, S.
Relationships between sensory variables, species, feeding systems, and panelists were examined by Procrustes Analysis. Six meat groups considering species and feeding type combinations were evaluated by ten panelists for five sensory characteristics (colour, texture, odour, taste, and acceptability). These characteristics were assessed using a nine-point hedonic scale (9 = extremely enjoy, 1 = extremely dislike). Generalized Procrustes Analysis was performed and 61.11% of the total variability was explained by the first two dimensions that correspond to Factor 1 and Factor 2. The first one accounted for 33.99% and the second for 27.12%. Results showed that pasture conditions were reflected in all sensory characteristics of meat of Hair goat as well as Karakas sheep. This study concluded that meat of sheep and goats reared in pasture conditions was more preferable as concerns sensory characteristics than that of fattening animals or those reared in intensive conditions.
A Modified Dcf Regimen as Primary Treatment for Patients With Metastatic Gastric Cancer
(Imprimatur Publications, 2013) Koca, D.; Dogan, E.; Yardim, H.; Duzen, O.; Karaca, S.
Purpose: To retrospectively assess the efficacy and toxity of a modified docetaxel, cisplatin, fluorouracil (mDCF) regimen as primary treatment in patients with metastatic gastric cancer (MGC). Methods: mDCF included folinic acid 400 mg/m(2) (day 1) + 5-fluorouracil (5-FU) 400 mg/m2 i.v. bolus (day 1) + 5-FU 2400 mg/m2 46-h infusion (days 1 and 2) + docetaxel 60 mg/m2 (day 1) + cisplatin 50 mg/m2 (day 1) and was administered once every two weeks in MGC patients. Results: Eighty-nine patients (median age 59 years, range 31-79) were enrolled. The median number of courses was 6 (range 2-12), and the total number was 492. The median follow-up duration was 8.6 months (range 2-14). Three (3.3%) patients showed complete response, 21 (23.6%) partial response, 36 (40.4%) stable disease, and progression was observed in 29 (32.6%) patients. The median progression-free survival (PFS) rate was 7 months (95% CI 5.7-8.2), and the median overall survival (OS) rate was 11 months (95% CI 9.7-12.2). The most common toxicity was neutropenia, which was observed in 52 (58.4%) patients. Conclusion: mDCF with reduced drug doses, given every two weeks, is a rather efficient regimen for MGC patients.
Morphology, Chemical Properties, and Radiocarbon Dating of Eutrophic Peat in Turkey
(Elsevier Science Bv, 2011) Cayci, G.; Baran, A.; Ozaytekin, H.; Kutuk, C.; Karaca, S.; Cicek, N.
Morphologies, classifications, chemical properties and radiocarbon dates of Akgol-Sakarya peatland located in the northwestern part of Turkey, which has never been studied up to now, were investigated. Three representative profiles were excavated in the study area and soil samples were taken based on soil horizons. Additionally, soil samples were taken at the different depths in each profile for radiocarbon dating. Accretion rates changed between 1.40 and 1.69 mm year(-1) to C-14 measurements. Radiocarbon ages ranged between 365 +/- 90 and 195 +/- 50 years depending on sampling depth. Profile I was Sapric Haplohemist, profile II was Hydric Haplohemist and profile III was Typic Haplosaprist. Soil properties varied widely depending on the profiles. Fibre contents were between 9.4% and 34.7% due to degree of organic matter decomposition. pH and ECe values varied between 4.20-6.62 and 0.51-2.50 dS m(-1), respectively. The cation exchange capacity (CEC) ranged from 100 to 140 cmol kg(-1). Total nitrogen and phosphorus ranged from 0.78% to 1.82% and from 0.45% to 1.03%, respectively. Total calcium contents were between 1.44% to 3.25%, and magnesium contents varied from 0.22 to 0.71%. Both nutrients were higher in the surface horizons of profiles land II. Total Fe, Mn, Zn, Cu and B contents varied considerably among profiles. It was found that total amounts of Fe, Zn, Cu and B in samples were between 4660-16220 mg kg(-1), 89-451 mg kg(-1), 16-57 mg kg(-1), 3-11 mg kg(-1) and 12-37 mg kg(-1), respectively. Cr, Ni and Pb contents in peat samples were 22-55 mg kg(-1), 24-58 mg kg(-1), and 3-93 mg kg(-1), respectively. However, there was no Cd and Hg detected. It was observed that seasonal ground water fluctuations, eutrophic formation and differences in decomposition degrees have a substantial effect on changing of morphological and chemical properties of organic soils in the study area. (C) 2011 Elsevier B.V. All rights reserved.
Relationship Between Temperament and Some Production Traits and Possibility of Using Temperament as a Selection Criteria in Sheep
(Centenary University, 2017) Çakmakçi, C.; Karaca, S.
Increased effort to enhance both animal production and welfare, indicates that new approaches are needed in this subject. Animal welfare is a subject of increasing concern in many countries around the world, and this concern causes animal users to change the ways of keeping and of treating their animals. In this context, selection of individuals which are less affected by various environmental stress factors related to management practices, depending on their temperament can be seen as an alternative method to obtain desired flock in animal production, to protect animal welfare and to improve productivity. In this review, stress response mechanism has been investigated in relation to temperament in sheep, and the existing methods used to evaluate temperament have been summarized. In addition, the relations between various behavioral characteristics and production were examined and the usage possibilities of temperament as a selection parameter were considered. © 2017, Centenary University. All rights reserved.
Relationships Between Soil Properties, Topography and Land Use in the Van Lake Basin, Turkey
(Federation of Eurasian Soil Science Societies, 2018) Karaca, S.; Gülser, F.; Selçuk, R.
The objective of this study was to determine the relationship between soil properties and different topography and land uses in the Van Lake Basin, Turkey. It has sharp and sheer slopes, and the big differences on altitude generally occur from the mountainous formations. Surface soil samples (0–20 cm) were taken from 40 different points with three different topography (backslope, footslope and terrace) and three different landuses (wheat, clover and pasture). Some of the studied soil properties (soil texture, electrical conductivity [EC], pH, lime content, organic matter content, macro and micro nutrients) changed in response to land use and topography. The clay, boron content, pH and EC values increased from the backslope to the terrace. Soil organic matter and EC values were lower in cultivated wheat and clover fields than in uncultivated pasture. The EC values had significant positive correlations with CaCO3, organic matter, K, B, Cu contents at 5% level and with Mg at 1% level statistically. The soil nutrient contents of cultivated wheat and clover fields were generally lower than the uncultivated pasture. The nutrient contents of soils in cultivated fields decreased due to nutrient uptake by crops. Soil texture, EC, pH, lime, organic matter and nutrient contents significantly varied in different topographic positions due to leaching, transporting and accumulation. © 2018 Federation of Eurasian Soil Science Societies. All rights reserved.