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Search Results: 1 - 10 of 461998 matches for " A. Kilic "
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Lead Inhibition on Urea Hydrolyzing Microorganisms under Batch Conditions
A. Kilic, H. Kocyigit
Biotechnology & Biotechnological Equipment , 2010, DOI: 10.2478/V10133-010-0079-2
Abstract: Lead, Pb(II), inhibition of microbial calcium precipitation by ureolytic microorganisms was carried out with a glucose containing mineral medium under batch conditions over an incubation period of 120 hours. Substrate removal rate fitted a zero order up to 70th hour and first order kinetic after that time for all samples containing lead concentrations of 0-64 mg/L. The increase of Pb(II) concentrations from 0 to 64 mg/L reduced constant of substrate degradation rate from 10.26 to 4.04 mg glucose/L h, and from 0.027 to 0.005 1/h for zero (k0) and first order kinetic constant (k1), respectively. The Pb(II) at concentration higher than 16 mg/L mainly inhibited both substrate removal and nitrification process. Although nitrification was inhibited at higher concentrations of lead, its inhibition caused precipitation of calcium due to high pH and alkalinity levels in the samples. As a result that a modified Monod inhibition model was applied to BOD data, BOD removal rate inhibited non-competitively. The non-competitive inhibition constants (K1) were 10.4 mg/L for KS, and 37.3 mg/L for Rmax at Pb(II) concentration of 64 mg/L.
Feshbach Resonance and Growth of a Bose-Einstein Condensate
C. Yuce,A. Kilic
Physics , 2006, DOI: 10.1103/PhysRevA.74.033609
Abstract: Gross-Pitaevskii equation with gain is used to model Bose Einstein condensation (BEC) fed by the surrounding thermal cloud. It is shown that the number of atoms continuously injected into BEC from the reservoir can be controlled by applying the external magnetic field via Feshbach resonance.
Inverted Oscillator
C. Yuce,A. Kilic,A. Coruh
Physics , 2007, DOI: 10.1088/0031-8949/74/1/014
Abstract: The inverted harmonic oscillator problem is investigated quantum mechanically. The exact wave function for the confined inverted oscillator is obtained and it is shown that the associated energy eigenvalues are discrete and it is given as a linear function of the quantum number $n$.
Outcome of patients with stage II and III nonseminomatous germ cell tumors: Results of a single center
Ataergin S,Ozet A,Arpaci F,Kilic S
Indian Journal of Cancer , 2007,
Abstract: Background: The prognostic factors in nonseminomatous germ cell tumors have been mainly derived from the analysis of stage I tumors. Aims: The aim of this study was to evaluate some prognostic factors and the outcome of patients with stage II and III nonseminomatous germ cell tumors according to risk groups treated between 1993 and 2002. Settings and Design: Patients were retrospectively classified as good, intermediate and poor risk groups according to International Germ Cell Cancer Consensus Group. Materials and Methods: Biopsy specimens of 58 patients with stage II and III nonseminomatous germ cell tumors were analyzed by means of tumor histopathology, primary localization site of the tumor, relapse sites, initial serum tumor marker levels, the presence of persistent serum tumor marker elevation and the patients′ outcome. Statistical Analysis :0 Kruskall Wallis test and Mann-Whitney U test were used to determine the differences between the groups. Kaplan-Meier method was used for survival analysis and log rank test was used to compare the survival probabilities of groups. Cox proportional hazard analysis was used to determine the prognostic factors in univariate and multivariate analysis. Results: Five-year overall and disease-free survival rates were calculated as 85% and 75% in stage II; 44% and 29% in stage III cases, respectively. Fifty-seven percent of patients were classified in good risk, 9% in intermediate risk and 27% in poor risk groups. Five-year overall survival rates were 97%, 75% and 7% ( P < 0.001) and disease-free survival rates were 83%, 34% and 7% ( P < 0.001) in good, intermediate and poor risk groups, respectively. Analysis of the prognostic factors revealed that the localization site of the primary tumor ( P < 0.001), the initial stage of disease ( P < 0.001), the initial serum AFP level (p: 0.001), the initial β -HCG level (p: 0.0048), the presence of yolk sac and choriocarcinoma components in tumor (p: 0.003 and p: 0.004), relapse sites of tumor (lung versus other than lung) (p: 0.003), persistent elevation of serum tumor markers ( P < 0.001) were significant prognostic factors in univariate analysis. However, in multivariate analysis, only the localization site of tumor (p: 0.049) and the relapse site (p: 0.003) were found statistically significant. Conclusions: This retrospective study revealed that in advanced stage of nonseminomatous germ cell tumors, the outcome is essentially related with the localization site of the tumor and the relapse site.
Effects of Impregnation with Timbercare Aqua to Surface Roughness of Some Varnishes
A. Togay,Y. Kilic,M.H. Colakoglu
Journal of Applied Sciences , 2009,
Abstract: This study has been performed for determining the impacts of impregnation with Timbercare Aqua (TA) to surface roughness of some varnishes. For analysis, measurements were performed in the vertical direction of fibers by using Mitutoya Surftest-301 stylus scanner device. Roughness values were determined with ±0.01 μm sensitivity where scanning length (lt) was 12 mm and sampling length was (λc) 2.5 mm according to TS 971 and ISO 4288 standards. As a result, Surface roughness (Ra) mean value was measured as highest in oak (3.359 μm), in waterborne interior space varnish (2.465 μm) and TA and one layer application (3.320 μm). For the combination of wood, type of varnish and impregnation process, surface smoothness was lowest in combination of Scotch pine and polyurethane varnish and one layer impregnation (0.433 μm) and highest in combination oak and interior space varnish and one layer impregnation with TA (6.502 μm). Ra was measured highest on the surfaces impregnated with TA. So, it can be said that TA has an increasing effect on the surface roughness of woods.
Gastroprotective Effect Of Cyperus rotundus Extract against Gastric Mucosal Injury Induced by Ischemia and Reperfusion in Rats
Muhammet E. Guldur,A. Ozgonul,Ibrahim H. Kilic,O. Sogut
International Journal of Pharmacology , 2010,
Abstract: Cyperus rotundus (CR) is widely used as a traditional folk medicine for treating various diseases such as gastrointestinal disorders, inflammatory and infectious diseases in Middle Eastern countries. However, the protective effects of CR extract on gastric mucosa has not been well defined. Thus, the aim of the present study was to investigate the protective effects of CR on gastric mucosal damage induced by ischemia and reperfusion in rats. Ischemia/reperfusion model was designed as of 30 min ischemia followed with 60 min reperfusion by clamping the celiac artery. The CR extracts were given at the doses of 100 or 200 mg kg-1 for preventing postischemic gastric mucosal injury. The study was carried out on equal five groups (n = 6) namely as follows: group I (sham, control group), group II (untreated ischemia control group), group III (treated ischemia group) was treated with 200 mg kg-1 CR, group IV (treated ischemia group) was treated with 100 mg kg-1 CR and group V (treated ischemia/reperfusion group) was treated with 200 mg kg-1 CR. Antioxidant enzymes activity such as Malondialdehyde (MDA) and glutathione-peroxidase (GSH-Px) were measured in the gastric tissue. Histopathological sections were examined for ischemic injury. The mean ulcer index of rats treated with 200 and 100 mg kg-1 CR were significantly lower (p<0.05) than that of control rats. The activities of GSH-Px and MDA were significantly affected (p<0.05) by treatment of CR in group III and group IV. These results indicate that both doses of CR extract have gastroprotective effect against acute gastric mucosal lesions induced by ischemia/reperfusion.
PSR J1738+0333: The First Millisecond Pulsar + Pulsating White Dwarf Binary
Mukremin Kilic,J. J. Hermes,A. Gianninas,Warren R. Brown
Physics , 2014, DOI: 10.1093/mnrasl/slu152
Abstract: We report the discovery of the first millisecond pulsar with a pulsating white dwarf companion. Following the recent discoveries of pulsations in extremely low-mass (ELM, <0.3 Msol) white dwarfs (WDs), we targeted ELM WD companions to two millisecond pulsars with high-speed Gemini photometry. We find significant optical variability in PSR J1738+0333 with periods between roughly 1790-3060 s, consistent in timescale with theoretical and empirical observations of pulsations in 0.17 Msol He-core ELM WDs. We additionally put stringent limits on a lack of variability in PSR J1909-3744, showing this ELM WD is not variable to <0.1 per cent amplitude. Thanks to the accurate distance and radius estimates from radio timing measurements, PSR J1738+0333 becomes a benchmark for low-mass, pulsating WDs. Future, more extensive time-series photometry of this system offers an unprecedented opportunity to constrain the physical parameters (including the cooling age) and interior structure of this ELM WD, and in turn, the mass and spin-down age of its pulsar companion.
Dusty WDs in the $WISE$ All Sky Survey $\cap$ SDSS
Sara D. Barber,Mukremin Kilic,Warren R. Brown,A. Gianninas
Physics , 2014, DOI: 10.1088/0004-637X/786/2/77
Abstract: A recent cross-correlation between the SDSS DR7 White Dwarf Catalog with the Wide-Field Infrared Survey Explorer ($WISE$) all-sky photometry at 3.4, 4.6, 12, and 22 microns performed by Debes et al. (2011) resulted in the discovery of 52 candidate dusty white dwarfs (WDs). The 6'' $WISE$ beam allows for the possibility that many of the excesses exhibited by these WDs may be due to contamination from a nearby source, however. We present MMT$+$SWIRC $J$- and $H$-band imaging observations (0.5-1.5'' PSF) of 16 of these candidate dusty WDs and confirm that four have spectral energy distributions (SEDs) consistent with a dusty disk and are not accompanied by a nearby source contaminant. The remaining 12 WDs have contaminated $WISE$ photometry and SEDs inconsistent with a dusty disk when the contaminating sources are not included in the photometry measurements. We find the frequency of disks around single WDs in the $WISE$ $\cap$ SDSS sample to be 2.6-4.1%. One of the four new dusty WDs has a mass of $1.04 M_{\odot}$ (progenitor mass $5.4 M_{\odot}$) and its discovery offers the first confirmation that massive WDs (and their massive progenitor stars) host planetary systems.
Limb-Darkening Coefficients for Eclipsing White Dwarfs
A. Gianninas,B. D. Strickland,Mukremin Kilic,P. Bergeron
Physics , 2013, DOI: 10.1088/0004-637X/766/1/3
Abstract: We present extensive calculations of linear and non-linear limb-darkening coefficients as well as complete intensity profiles appropriate for modeling the light-curves of eclipsing white dwarfs. We compute limb-darkening coefficients in the Johnson-Kron-Cousins UBVRI photometric system as well as the Large Synoptic Survey Telescope (LSST) ugrizy system using the most up-to-date model atmospheres available. In all, we provide the coefficients for seven different limb-darkening laws. We describe the variations of these coefficients as a function of the atmospheric parameters, including the effects of convection at low effective temperatures. Finally, we discuss the importance of having readily available limb-darkening coefficients in the context of present and future photometric surveys like the LSST, Palomar Transient Factory, and the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS). The LSST, for example, may find ~10^5 eclipsing white dwarfs. The limb-darkening calculations presented here will be an essential part of the detailed analysis of all of these systems.
Magnetic White Dwarfs: Observations, Theory, and Future Prospects
Enrique García-Berro,Mukremin Kilic,S. O. Kepler
Physics , 2015,
Abstract: Isolated magnetic white dwarfs have field strengths ranging from kilogauss to gigagauss, and constitute an interesting class of objects. The origin of the magnetic field is still the subject of a hot debate. Whether these fields are fossil, hence the remnants of original weak magnetic fields amplified during the course of the evolution of the progenitor of white dwarfs, or on the contrary, are the result of binary interactions or, finally, other physical mechanisms that could produce such large magnetic fields during the evolution of the white dwarf itself, remains to be elucidated. In this work we review the current status and paradigms of magnetic fields in white dwarfs, from both the theoretical and observational points of view.
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