Yazar "Yumak, Hasan" seçeneğine göre listele

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    Determination of the fuel properties of cottonseed oil methyl ester and its blends with diesel fuel
    (2014) Eryılmaz, Tanzer; Yeşilyurt, Murat Kadir; Yumak, Hasan; Arslan, Mevlut; Şahin, Seda
    In this study; density, kinematic viscosity, calorific value, flash point and water content of methyl ester produced from cottonseed oil (CO) were determined under varying blend ratio with ultimate euro diesel fuel, also density and kinematic viscosity were investigated at different temperatures. Six different fuel blends (3%, 5%, 10%, 25%, 50% and 75% by volume blending with diesel), cottonseed oil methyl ester (COME), cottonseed oil and diesel were used for experiments. Density of samples was measured 0- 93 o C interval with 5oC increments and kinematic viscosity of samples was measured 298.15- 373.15 K interval with 5 K increments. All of the measurements were performed at 20o C room temperatures. It is found that; density, kinematic viscosity, calorific value, flash point and water content of cottonseed oil are 921.50 kg/m3 , 31.347 mm 2 /s, 39.278 MJ/kg, 237oC and 232.90 mg/kg, respectively. For cottonseed oil methyl ester, they are 884.75 kg/m3 , 4.713 mm 2/s, 39.254 MJ/kg, 171 oC and 499.19 mg/kg, respectively. The densities of each fuel sample decreased linearly with increasing temperature. But the kinematic viscosities of each fuel sample decreased exponentially with increasing temperature. In addition experimental results, the most commonly used prediction models were used to calculate the density and kinematic viscosity varying with temperature and blend ratio. Also calorific value, flash point and water content were correlated.
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    Discriminating a Single Nucleotide Difference for Enhanced miRNA Detection Using Tunable Graphene and Oligonucleotide Nanodevices
    (AMER CHEMICAL SOC, 2015) Robertson, Neil M.; Hizir, Mustafa Salih; Balcioglu, Mustafa; Wang, Rui; Yavuz, Mustafa Selman; Yumak, Hasan; Ozturk, Birol
    In this study we have reported our efforts to address some of the challenges in the detection of miRNAs using water-soluble graphene oxide and DNA nanoassemblies. Purposefully inserting mismatches at specific positions in our DNA (probe) strands shows increasing specificity against our target miRNA, miR-10b, over miR-10a which varies by only a single nucleotide. This increased specificity came at a loss of signal intensity within the system, but we demonstrated that this could be addressed with the use of DNase I, an endonuclease capable of cleaving the DNA strands of the RNA/ DNA heteroduplex and recycling the RNA target to hybridize to another probe strand. As we previously demonstrated, this enzymatic signal also comes with an inherent activity of the enzyme on the surface-adsorbed probe strands. To remove this activity of DNase I and the steady nonspecific increase in the fluorescence signal without compromising the recovered signal, we attached a thermoresponsive PEGMA polymer (poly(ethylene glycol) methyl ether methacrylate) to nGO. This smart polymer is able to shield the probes adsorbed on the nGO surface from the DNase I activity and is capable of tuning the detection capacity of the nGO nanoassembly with a thermoswitch at 39 degrees C. By utilizing probes with multiple mismatches, DNase I cleavage of the DNA probe strands, and the attachment of PEGMA polymers to graphene oxide to block undesired DNase I activity, we were able to detect miR-10b from liquid biopsy mimics and breast cancer cell lines. Overall we have reported our efforts to improve the specificity, increase the sensitivity, and eliminate the undesired enzymatic activity of DNase Ion surface-adsorbed probes for miR-10b detection using water-soluble graphene nanodevices. Even though we have demonstrated only the discrimination of miR-10b from miR-10a, our approach can be extended to other short RNA molecules which differ by a single nucleotide.
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    Yozgat ili şartlarında yetiştirilen Aspir (Carthamus tinctorius L.) dinçer çeşidinden üretilen biyodizelin yakıt özelliklerinin belirlenmesi
    (2014) Eryılmaz, Tanzer; Yeşilyurt, Murat Kadir; Cesur, Cüneyt; Yumak, Hasan; Aydın, Emine; Çelik, Sadiye Ayşe; Yıldız, Adil Koray
    Bu çalışmada Yozgat ili şartlarında yetiştirilen ülkemiz tescilli aspir (Carthamus tinctorius L.) çeşitlerinden Dinçer (Dikensiz) çeşidinin tohumlarından ham yağ elde edilmiştir. Elde edilen bu ham yağdan üretilen biyodizelin analizleri yapılmıştır. Dinçer tohum ham yağ biyodizeli 15C'de ki yoğunluğu (882.97 kg/m3), pH değeri (6), parlama noktası (178oC), bakır şerit korozyon (1a), su içeriği (499.20 mg/kg), ısıl değeri (38.448 MJ/kg), bulutlanma, akma ve donma noktaları sırasıyla (-5.7oC, -12.9oC ve -15.8oC) olarak tespit edilmiştir. Elde edilen sonuçlara göre Dinçer çeşidinin tohum ham yağının biyodizel üretimi açısından TS EN 14214 standardına uygun olacağı sonucuna varılmıştır.