Showing papers by "Zonguldak Karaelmas University published in 1998"
TL;DR: The carboxylic acids derived from olive oil, hazelnut oil, sesame oil and hamci(anchovy) oil were evaluated as substrates for cell growth and the production of reserve polyesters by Pseudomonas oleovorans as mentioned in this paper.
Abstract: The carboxylic acids derived from olive oil, hazelnut oil, sesame oil and hamci(anchovy) oil were evaluated as substrates for cell growth and the production of reserve polyesters by Pseudomonas oleovorans. Poly-3-hydroxy alkanoates containing both saturated(mainly 3-hydroxy-octanoate and 3-hydroxy-decanoate) and unsaturated repeating units with 8 to 20 carbon atoms, or more, were produced in 26 to 61% yields based on cell dry weights. The number average molecular weights of these polymers varied from 45,000 to 68,000 Daltons.
43 citations
TL;DR: In this article, the influence of the external field on the current-voltage characteristics and the critical current density J c and on the angular dependence of voltage V and resistivity ρ have been discussed in terms of the Lorentz force driven flux flow motion of the vortices.
Abstract: The influence of the external field on the current–voltage characteristics and the critical current density J c and on the angular dependence of voltage V and resistivity ρ have been discussed in terms of the Lorentz force driven flux flow motion of the vortices. We have obtained analytical expressions for the field dependencies and angular dependencies of the critical current density, the current–voltage characteristics, voltage V and resistivity ρ which are in reasonable agreement with the experimental data published previously.
31 citations
TL;DR: In this paper, measurements of the adsorption properties of sulfur dioxide on zeolites were investigated and the adsorbents used in this work are 5A, 4A and AW300 type molecular sieve zeolite.
Abstract: Sulfur dioxide is one of the major pollutants resulting from fuel combustion. Numerous dry, semi-dry and wet processes have been developed for pollution control of sulfur dioxide. Solid carbonates, natural and synthetic zeolites, ion exchange resins and carbon based sorbents are the most commonly used dry sorbents for sulfur dioxide removal In this study, measurements of the adsorption properties of sulfur dioxide on zeolites were investigated. The adsorbents used in this work are 5A, 4A and AW300 type molecular sieve zeolites. Adsorption equilibrium parameters were determined from the pulse chromatographic response to injections of low concentrations of sulfur dioxide. The method of moments were used to evaluate the adsorption equilibrium parameters from pulse chromatographic experiments. Data, such as adsorption equilibrium constants or reaction rate parameters are essential in the design of adsorption systems or reactors in which sulfur dioxide is removed The experiments were conducted in a te...
19 citations
TL;DR: In this paper, a macromonomeric azo initiator containing biodegradable poly(e-caprolactone, (PCL) was synthesized by the condensation reaction of PCL with 4,4′-azobis(4-cyanopentanoyl chloride) and methacryl loyls chloride.
Abstract: Macromonomeric azo initiator containing biodegradable poly(e-caprolactone, (PCL) was synthesized by the condensation reaction of PCL with 4,4′-azobis(4-cyanopentanoyl chloride) and methacryloyl chloride. This macromonomeric azo initiator (MIM–PCL) was further used in the polymerization of styrene (St) or methylmethacrylate (MMA) via a radical initiated process at 60°C in bulk in order to obtain polystyrene (PS)-b-PCL or poly(methyl methacrylate) (PMMA)-b-PCL crosslinked block copolymers. Thermal decomposition kinetics of MIM–PCL and its copolymers were studied by using thermogravimetric analysis and differential scanning calorimetry (DSC). DSC traces of MIM–PCL showed two different exotherms, at 98 and 127°C. The first exotherm, observed at 98°C, was due to the polymerization of the terminal methacrylic groups; the other was due to the exothermic decomposition of azo groups of MIM–PCL. PCL-b-PS and PCL-b-PMMA crosslinked block copolymers showed single glass transition temperatures due to the compatibility of the crosslinked block segments. The polymer–solvent interaction parameter of PCL in chloroform was determined by vapor pressure osmometry to be 0.1 for the PCL–chloroform system at 30°C. The average molecular weights between junction points of crosslinked homo PCL were calculated by using the Flory–Rehner equation. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1149–1157, 1998
12 citations
11 citations
TL;DR: In this article, the effects of irradiation on wheat seeds were investigated by using the electron paramagnetic resonance (EPR) spin probe technique, which is based on the ability of the spin probes to transfer valuable information related to the changes in the structural characteristics of embryo cell membranes caused by irradiation.
Abstract: The fast decay of free radicals makes application of traditional electron paramagnetic resonance (EPR) techniques impractical for detection of irradiated wheats when the storage time is longer than 30 days. In this study, therefore, the effects of irradiation on wheat seeds were investigated by using the EPR spin probe technique. The technique is based on the ability of the spin probes to transfer valuable information related to the changes in the structural characteristics of embryo cell membranes caused by irradiation. As a result of irradiation, the enviroment of the spin probe is modified and this modification can be followed from the recorded spectra. The doses studied were 1.0, 2.5, 10.0, and 20.0 kGy. An aqueous solution of 16-doxyl stearic acid (16-DSA) was used The embryos were detached using a steel needle and kept in 16-DSA solution for 2.5 hr and washed with distilled water. The spectra of the samples were recorded. The detection of irradiated wheats by this technique was possible at ...
10 citations
TL;DR: In this article, the dynamical and structural properties of the Au6 cluster were studied using microcanonical molecular dynamics simulations, and the interaction between the atoms in the cluster was modeled by an empirical model potential.
Abstract: The dynamical and structural properties of the Au6 cluster are studied using microcanonical molecular dynamics simulations. The interaction between the atoms in the cluster is modeled by an empirical model potential. The cluster is heated up to 2000 K and during the meltinglike transition an isomer of the cluster in C5V (flat pentagonal pyramid) geometry is observed. The cluster’s melting temperature is determined as ∼665 K.
2 citations
01 Jan 1998
TL;DR: Hazelnut tree grows prevalently in Anatolia, especially in Black Sea region as discussed by the authors, where people of Blacksea region establish hazelnut gardens by usually opening the areas from forest.
Abstract: Hazelnut tree grows prevalently in Anatolia, especially in Black Sea region. In places close to sea cultural hazelnuts; in forest areas natural hazelnuts are generally seen. People of Blacksea region establish hazelnut gardens by usually opening the areas from forest. Hazelnut, walnut and olive are among nourishing sources of Anatolian people. These three fruit trees are also common to the Mediterranean countries. Likewise, hazelnut is one of the most important export products of Turkey.
1 citations