Ahmet Baysar

Inonu University · Department of Chemical Engineering

Hepatocellular carcinoma is a common cancer type, especially among men. Although cucurbitacin I (CuI), widely found in plants belonging to the Ecballium elaterium (E. L) plant family, has been shown to have antitumorigenic properties in many cancer types, its anticancer effect, molecular mechanism, and apoptotic effect mediated by signal pathways o...

Background Cucurbitacin D (CuD) is a natural compound that can be isolated in various plant families, mainly from Ecballium Elaterium (L.) A. Rich. (E. Elaterium). It is a triterpenoid with a broad spectrum of biological activity, including anti-cancer properties. Hepatocellular carcinoma, the aggressive type of liver cancer, is an important public...

Üretim aşamalarında dış çevreden çeşitli etkenlere maruz kalan kuru kayısılar, tonlarca su kullanılan geleneksel yıkama yöntemleri ile belirli bir miktara kadar arındırılabilmektedir. Kurutma sırasında kayısı yüzeyinde biriken toz ve toprak vb. fiziksel kirlerin giderilmesi için yapılan tekrarlı işlemler ise su israfını artırmakta ve ürün kalitesin...

Ülkemizin kuru kayısı ihracatında büyük bir paya sahip olan Malatya kayısısının öne çıkan başlıca özellikleri yüksek kuru madde, şeker, mineral ve vitamin oranına sahip olmasıdır. Kuru kayısı yıl boyunca tüketildiğinden, ihracat da yıl boyunca yapılmaktadır. İhracatın yıl boyunca devam etmesinden dolayı kuru kayısının bazen bir yıldan bile daha faz...

The objective of this study was to develop a rapid, economic, and efficient method for simultaneous selective isolation, separation, and purification of cucurbitacin D and I from Ecballium elaterium (L.) A. Rich fruit juice via reversed-phase flash chromatography combined with HPLC. The chloroform extract of the fruit juice was fractionated with fl...

In this study, the removal of acidic dyestuff, Acid Blue 193 (Isolan Dark Blue 2S-GL-03) from the aqueous solution by using the newly synthesized poly (Acrylamide-Vinimidimidazole) (poly (AAm-VI)) hydrogel in the batch system was investigated by adsorption. The synthesized hydrogel was characterized by SEM, FTIR and TGA methods. The effects of the...

In this study, the amounts of reduced form of glutathione (GSH), oxidized form of glutathione (GSSG) and various B vitamins particularly, thiamine hydrochloride (vitamin B1), riboflavin (vitamin B2), nicotinic acid (vitamin B3), pyridoxine hydrochloride (vitamin B6) and folic acid (vitamin B9) in fresh ripe apricot fruits of six different varieties...

Formaldehyde is used extensively in resin plants and medical/pathological laboratories where formaldehyde concentration in the wastewater is up to 6 g/L. This amount is much higher than the level of biodegradation (225 mg/L). Formaldehyde is a carcinogen and mutagenic substance on living organisms so formaldehyde must be removed or detoxified befor...

Cucurbitacin I is a natural component extracted from plants of the Cucurbitaceae family and has shown anti-cancer activity against various types of cancer. The aim of the present study was to investigate its antiproliferative and antimigratory effects on LS174T colon cancer cell line. The inhibitory effect on proliferation was assessed by a 3-(4, 5...

Telomerase activity is dependent on the expression level of human telomerase reverse transcriptase (hTERT) in cancer cells. hTERT messenger ribonucleic acid (mRNA) is expressed in more than 85% of cancer cells, but not in normal human somatic cells. Therefore, the proliferation of human cancer cells can be arrested by telomerase inhibition. We aime...

High Performance Liquid Chromatography was utilized to determine vitamins A, E and C, β‐carotene and folic acid levels of sun and microwave dried red pepper species (Capsicum annuum L.). Various forms (i.e., chopped, powdered, salted and oiled) of red peppers were tested for the above mentioned vitamins, β‐carotene and folic acid levels. The result...

Manganese compounds, such as manganese sulfate, can be obtained from pyrolusite, a manganese ore. Low-grade manganese ores is usually treated by hydrometallurgical methods. In this study, the leaching and recovery of manganese from pyrolusite ore in sulfuric acid solutions containing sawdust as reducing agent was investigated. The effects of experi...

Cementation of copper from zinc containing copper solutions using metallic zinc was studied in this work. The effect of copper, zinc and ammonium chloride concentration, stirring speed, pH and temperature on the cementation of copper was determined. Cementation rate increased with initial copper concentration, stirring speed and temperature. pH var...

Changes in functional and sensory properties of tarhana prepared by different drying methods were investigated. While tunnel-dried (TD) tarhana had significantly (P < 0.05) higher foaming capacity compared to freeze-dried (FD), home-microwave-oven-dried (HMD) and industrial-microwave-dried (IMD) samples, the FD tarhana showed the highest protein so...

In this paper, surface modification of dielectric polymers, having different physical and chemical properties (polyimide—PI, polystyrene—PS, Polyethylene terephthalate—PET), treated in contourized glow discharge in SF6+N2 gas medium near cathode was studied. The electret state, formed as a result of modification, caused an increase in the surface e...

The dissolution kinetics of ulexite in ammonium sulfate solutions was investigated. The effects of ammonium sulfate concentration, particle size, solid/liquid ratio, stirring speed, and reaction temperature on the dissolution rate have been evaluated. It was found that the dissolution rate increased with increasing ammonium sulfate concentration, s...

Lipid peroxidation involves the oxidative deterioration of polyunsaturated fatty acids in biomembranes and generates a variety of aldehydic products including malondialdehyde (MDA). To demonstrate the occurrence of lipid peroxidation in biological systems, the production of MDA has been shown to be a relevant indicator. Therefore, we describe a new...

The dehydration reaction kinetics of tincal and borax decahydrate was investigated by thermogravimetry (TG) and differential thermal analysis (DTA). Various methods were used to analyze the TG and DTA data for determination of reaction kinetics. The activation energy, frequency factor, and order of reaction were calculated for both materials. The r...

A cavity technique based on frequency shift was used to measure dielectric properties (dielectric constant and loss factor) of some particulate materials as a function of temperature. The materials studied were alumina, cobalt/alumina, dolomite, and sand. The properties were measured at various points between room temperature and 600°C in the frequ...

Fluidized bed reactors have great potential for use in high-purity silicon chemical vapor deposition with microwaves as the energy source. The mode tuning characteristics of a fluidized bed reactor were investigated. The lower-order TE and TM mode resonance frequencies were computed and measured as a function of dielectric height for two different...

Thesis (Ph. D.)--Arizona State University, 1993. Vita. Includes bibliographical references (leaves [222]-234).

The cavity technique based on frequency tuning was used to measure dielectric properties (dielectric constant, lossfactor and loss tangent) of high purity polycrystalline particulate silicon obtained from two different sources. The dielectric properties were measured as afunction of temperature (23°C to 650°C) and particle size (30 -200 mesh range)...

A microwave system was designed and built which was capable of heating a fluidized bed reactor to elevated temperatures. High temperature heating was achieved through proper microwave network design and selection of fluidized bed material which had the best microwave energy conversion efficiency. The transmission network components were designed so...

Fourier Transform Infrared Spectroscopy was utilized to identify adsorbed species on Zn/Cu/Cr oxide and potassium carbonate-promoted Zn/Cu/Cr oxide catalysts at 285/sup 0/C and atmospheric pressure. Adsorption of various molecules on catalysts provided information about the nature of the adsorbed species. As a result of CO/H/sub 2/ mixture, methano...