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Öğe Assessment of arterial stiffness in patients with inactive and active Behcet's disease(TAYLOR & FRANCIS LTD, 2014) Yilmaz, S.; Celik, G.; Esmen, S. E.Objectives: Behcet's disease (BD) is a systemic vasculitis involving diverse sizes of arteries and veins. The aim of this study was to evaluate the relationship between central blood pressures, pulse wave velocity (PWV) measurements, and biochemical parameters in patients with inactive and active BD and control subjects. Method: Ninety-six patients with BD were recruited in this study. Each subject was evaluated in active and inactive disease periods. For the control group, 54 healthy age-and sex-matched subjects were enrolled. All patients completed a standard questionnaire form and various laboratory parameters were evaluated. Vascular measurements were performed with a Mobil-O-Graph 24-h PWA Monitor, an automatic oscillometric device. Results: According to the vascular function parameters of patients with active and inactive BD, 24-h, day, and night PWV values were higher in patients with active BD than in patients with inactive BD (p < 0.05). When we performed a linear regression analysis, 24-h PWV was positively correlated with age and duration of BD. Cardiac output (CO) values and day central diastolic blood pressure (DBP) were higher in patients with BD than in the control group (p < 0.05). Conclusions: PWV values were higher in patients with active BD than in patients with inactive BD. This may be explained by more prominent inflammatory changes in the vascular wall in the active disease period. Further studies in large populations are required to confirm our results.Öğe Assessment of body composition with bioelectrical impedance analysis in pregnant women with hyperemesis gravidarum before and after treatment(TAYLOR & FRANCIS INC, 2015) Pekin, A. Tazegul; Yilmaz, S. A.; Kerimoglu, O. Secilmis; Celik, G.; Dogan, N. U.; Beyhekim, H.; Celik, C.More than half of pregnant women suffer from nausea and vomiting, in 0.5-1% of the pregnant women, if nausea and vomiting are severe and persistent, condition can progress to hyperemesis. We evaluated the fluid volume parameters in pregnant women with hyperemesis gravidarum, before and after treatment using the bioelectrical impedance vectors. A total of 70 pregnant women who had weight loss exceeding 5% of pre-pregnancy body weight were recruited for the study in the first trimester. The measurement of multi-frequency bioelectrical impedance analysis parameters was performed on the day of hospitalisation before any treatment and after treatment at 24 h and 72 h with the same procedure. Total body water, extracellular water, intracellular water, and fat-free mass index increased after treatment at 24 h (P < 0.01). Also, the mean pregnancy-unique quantification of emesis and nausea score was significantly lower after treatment (11.3 +/- 2.1 at enrolment, 5.1 +/- 1.4 at 24 h and 4.3 +/- 1.1 at 72 h) (P < 0.01), which correlated with the patients' clinical improvement and changes in hydration. In pregnant women with moderate-to-severe hyperemesis gravidarum, significant body composition changes occur and fluid replacement therapy performed during a short period of time, such as 24 h, provides improvement in body composition.Öğe Biochemical Parameters, Renal Function, and Outcome of Pregnancy in Kidney Transplant Recipient(ELSEVIER SCIENCE INC, 2011) Celik, G.; Toz, H.; Ertilav, M.; Asgar, N.; Ozkahya, M.; Basci, A.; Hoscoskun, C.Introduction. The number of women who would like to have a baby after renal transplantation has increased. The aim of this study was to evaluate the effects of pregnancy on the lipid profiles and renal functions among transplantation patients as well as the maternal and fetal results of pregnancy. Materials and Methods. We searched files of female patients who underwent renal transplantation between 1998 and 2008 to discover 31 pregnancies among 24 women. Results. Mean duration of dialysis and age at transplantation for the 24 cases were 22.7 +/- 24.1 months (range, 0-72) and 21.2 +/- 4.6 years (range, 13-34), respectively. The time between transplantation and conception as well as age at conception were 5.2 +/- 1.9 and 26.4 +/- 4.4 years, respectively. Creatinine levels in the second trimester were significantly lower (P = .000). Gestational bicarbonate and albumin levels were significantly lower (P = .009 and P = .001, respectively). There were significant differences between the preconception triglyceride (TG) and those in the second and third trimesters (P = .006 and P = .00, respectively). TG levels increased as trimesters progressed (P = .000). Moreover, TG levels were higher among patients taking cyclosporine. Of pregnancies that passed the first trimester, 88.4% resulted in live births. There were 23 (74.19%) live births among 31 pregnancies with a cesarean section rate of 58%. Of the cases, 16.1% delivered preterm and 19.4% of babies had low birth weights. Conclusion. We believe that women with renal transplants can have healthy babies with close monitoring during pregnancy and without any effect on graft survival.Öğe Calculation of the 1s-2s two-photon excitation cross-section in atomic hydrogen(SPRINGER, 2008) Celik, G.; Celik, E.; Kilic, H. S.The two-photon excitation cross-section of atomic hydrogen is calculated using explicit summation over intermediate states within the framework of dipole approximation. The matrix element for two-photon excitation is transformed into finite sums, consisting of the product of a radial and angular part. Nine intermediate states are employed in the calculation of the transition matrix element. The two-photon excitation cross-section obtained for the transition 1s(2)S(1/2)-2s(2)S(1/2) in atomic hydrogen is a good agreement with the literature.Öğe The calculation of transition probabilities for atomic oxygen(SPRINGER, 2007) Celik, G.; Ates, S.The atomic transition probabilities for multiplet and individual lines and oscillator strengths for multiplet lines between some triplet and quintet levels have been calculated using weakest bound electron potential model theory (WBEPMT) in neutral oxygen. The results obtained in this work are in good agreement with the data obtained from different theoretical methods given in the literature and with critically evaluated values taken from NIST. Moreover, some new transition probabilities and oscillator strengths for highly excited levels in atomic oxygen have been obtained using this method.Öğe Calculations of transition probabilities for some excited levels of NaI(POLISH ACAD SCIENCES INST PHYSICS, 2008) Celik, G.; Ates, S.Transition probabilities are calculated for individual and multiplet lines between some excited states in neutral sodium by using the weakest bound electron potential model theory. In the determination of parameters required for calculation of transition probabilities, we employed numerical non-relativistic Hartree-Fock wave functions for expectation values of radii in all levels. The necessary energy values were taken from experimental energy data in the literature. The obtained results were compared with accepted values taken from National Institute of Standards and Technology data and multi-configurational Hartree-Fock results given by Fischer. A good agreement was observed in related excited states.Öğe Determination of excited-state ionization Potentials for lithium-like sequence using weakest bound electron potential model theory(POLISH ACAD SCIENCES INST PHYSICS, 2007) Celik, G.; Yildiz, M.; Kilic, H. S.In this work, the theoretical calculation of excited-state ionization potentials for Is(2)2p(2)P(1/2), 1s(2)3s(2)S(1/2), 1s(2)3d(2)D(1/2), 1s(2)4s(2)S(1/2), 1s(2)4p(2)P(1/2), and 1s(2)4d(2)D(1/2) iso-spectrum series of lithium-like elements were carried out using a weakest bound electron potential model theory for nuclear charges from Z = 3 to Z = 18. The Breit-Pauli approximation was used for relativistic contributions. The obtained values are compared with the experimental results from literature. The overall agreement between data obtained in this work and experimental data from literature can appear to be quite good being generally within 0.1% of experimental values.Öğe E1 and E2 transitions for Fe XVI, Co XVII and Ni XVIII(SPRINGER, 2016) Celik, G.; Ates, S.Electric dipole and electric quadrupole transition data for sodium-like iron, cobalt and nickel have been calculated within the weakest bound electron potential model (WBEPM) theory using experimental energy levels and theoretical expectation values of orbital radii corresponding to those energy levels under the assumption of the LS coupling scheme. The results obtained from this study provide theoretical transition probability and oscillator strength data requested in many fields of researches, especially astrophysics. The calculated transition data results have been compared with available data in the literature. The present results are consistent with earlier calculations. Some new electric quadrupole transition probability values not existing in the data bases, especially for iron have been obtained using this method.Öğe Electric dipole radiative lifetimes for neutral boron atom(INDIAN ASSOC CULTIVATION SCIENCE, 2013) Yildiz, M.; Gokce, Y.; Celik, G.We have determined the radiative lifetimes of excited states in atomic boron using weakest bound electron potential model theory. For determining relevant parameters needed for calculation of lifetimes, we have employed numerical non-relativistic Hartree-Fock wave functions for expectation values of radius. The necessary energy values have been taken from experimental energy data from National Institute of Standards and Technology. The calculated lifetimes have been compared with available results.Öğe Electric dipole transition probabilities, oscillator strengths, and lifetimes for Co16+(CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS, 2016) Celik, G.; Ates, S.; Tekeli, G.The electric dipole transition probabilities, oscillator strengths, and lifetimes for Co16+ have been calculated within the weakest bound electron potential model (WBEPM) theory using experimental energy levels and theoretical expectation values of orbital radii corresponding to those energy levels under the assumption of the LS coupling scheme. In the calculations both multiplet and fine structure transitions are studied. The present results are consistent with earlier results given in the literature. Moreover, some transition probability and oscillator strength values not existing in the literature are reported for the first time.Öğe Oscillator Strengths for Allowed Transitions in Li(II)(POLISH ACAD SCIENCES INST PHYSICS, 2009) Ates, S.; Celik, G.Electric dipole oscillator strengths have been computed for transitions between both multiplet and individual lines in the Li(II) ion. The weakest bound electron potential model theory has been used. We have employed both numerical Coulomb approximation wave functions and numerical non-relativistic Hartree-Fock wave functions in the determination of expectation values of radii. The necessary energy values have been taken from experimental ionization energies. The oscillator strengths calculated with parameters obtained by using the two different wave functions have been compared not only to each other but also to other data taken from literature. A good agreement with results in literature has been obtained.Öğe Oscillator strengths for singly ionized oxygen(SPRINGER, 2009) Ates, S.; Tekeli, G.; Celik, G.; Akin, E.; Taser, M.The electric dipole oscillator strengths for multiplet and individual lines between some doublet and quartet levels have been calculated using the weakest bound electron potential model theory (WBEPMT) in singly ionized oxygen. We employed both numerical Coulomb approximation (NCA) wave functions and numerical non-relativistic Hartree-Fock (NRHF) wave functions for expectation values of radii in determination of parameters. The calculated oscillator strengths have been compared with available theoretical and experimental results. A good agreement with results in literature has been obtained. Moreover, oscillator strengths not existing in the literature for some highly excited levels have been obtained using this method.Öğe Radiative Lifetimes for Singly Ionized Beryllium(POLISH ACAD SCIENCES INST PHYSICS, 2016) Celik, G.; Atalay, B.; Ates, S.The theoretical lifetimes for singly ionized beryllium (Be II) have been calculated using the weakest bound electron potential model theory and the quantum defect orbital theory under the assumption of the LS coupling scheme. In the calculations, many states are considered. Some lifetime values for highly excited levels have been obtained using these methods. The lifetimes presented in this work have been compared with the early theoretical calculations and measurements presented in the literature. A good agreement with the results in the literature has been obtained.Öğe Radiative Lifetimes of Rydberg States in Neutral Gallium(POLISH ACAD SCIENCES INST PHYSICS, 2009) Yildiz, M.; Celik, G.; Kilic, H. S.Radiative lifetimes were calculated using weakest bound electron potential model theory for 4s(2) ns S-2(1/2) (n >= 7), 4s(2) np P-2(1/2)0 (n >= 5), 4s(2) np P-2(3/2)0 (n >= 6), 4s(2) nd D-2(3/2)0 (n >= 6), 4s(2) nd D-2(5/2)0 (n >= 6) series in neutral gallium. The use of the quantum defect theory and Martin's expressions allowed us to supply lifetime values along by means of the series above. The results obtained in this work presented good agreement with theoretical and experimental values. Moreover, some lifetime values not existing in the literature for highly excited Rydberg states in gallium atom were obtained using this method.Öğe The Relationship between Bioimpedance Analysis, Haemodynamic Parameters of Haemodialysis, Biochemical Parameters and Dry Weight(FIELD HOUSE PUBLISHING LLP, 2011) Celik, G.; Kara, I.; Yilmaz, M.; Apiliogullari, S.Adequate fluid management plays an important role in the treatment of haemodialysis patients and the assessment of dry weight is important for efficient therapy. Fluid volume parameters were assessed in adults undergoing haemodialysis for end-stage renal disease, using whole-body multifrequency bioimpedance analysis (BIA), and their relationship to haemodynamic and biochemical parameters of haemodialysis was evaluated. Ultrafiltration volume was correlated with age, sodium, haemoglobin, extracellular water (ECW)/total body water (TBW) ratio and ECW/intracellular water (ICW) ratio. The ECW/TBW ratio was correlated with age, body mass index, dry weight, predialysis systolic and diastolic blood pressure, and ECW/total body weight ratio. The ECW/ICW ratio correlated with age, dry weight, TBW, albumin, adequacy of dialysis and urea removal ratio. The study demonstrated a close relationship between bioimpedance-derived fluid volume parameters and the haemodynamic and biochemical parameters of haemodialysis. It is concluded that multifrequency whole-body BIA may have clinical value in the estimation of dry weight and other haemodynamic parameters of haemodialysis and so may protect patients from the risks associated with under- or over-hydration.Öğe The Relationship between the Antioxidant System and Anaemia in Haemodialysis Patients(SAGE PUBLICATIONS LTD, 2011) Celik, G.; Yontem, M.; Bilge, M.; Cilo, M.; Unaldi, M.Anaemia and oxidative stress are common features of chronic kidney disease, and both are associated with an increase in morbidity and mortality. There is growing evidence, from experimental and clinical studies, that oxidative stress may be implicated in the pathogenesis of anaemia. This study investigated the relationship between total antioxidant capacity, anaemia and serum albumin levels in 127 non-diabetic patients requiring haemodialysis. Total serum antioxidant capacity levels were determined and were found to be significantly correlated with levels of haemoglobin, haematocrit, serum albumin, serum total protein, malondialdehyde (a product of lipid peroxidation), potassium, phosphorus and alanine transaminase. There was also a significant correlation between serum albumin levels and haemoglobin and haematocrit levels. In conclusion, total antioxidant capacity was found to be inversely correlated with malondialdehyde levels and positively correlated with haemoglobin and haematocrit levels in non-diabetic patients requiring haemodialysis. Patients with high serum albumin concentrations and high total antioxidant capacity may also have high (i.e. normal) levels of haemoglobin.Öğe The theoretical calculation of transition probabilities for some excited p-d transitions in atomic nitrogen(SPRINGER, 2006) Celik, G.; Akin, E.; Kilic, H. S.The atomic transition probabilities are calculated for individual lines between some quartet terms of 3p -> 4d and 3p -> 5d transition arrays using weakest bound electron potential model theory (WBEPMT). In the determination of relevant parameters which are needed for calculation of transition probabilities; we employed numerical non-relativistic Hartree-Fock wave functions for expectation values of radius in both ground and excited states unlike to NCA method used on traditional WBEPMT procedure. We have obtained very good agreement between our results and the accepted values taken from NIST.Öğe Transition probabilities of neutral scandium(CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS, 2014) Ozturk, I. K.; Celik, G.; Gokce, Y.; Atalay, B.; Guzelcimen, F.; Er, A.; Basar, G.The electric dipole transition probabilities and the oscillator strengths of neutral scandium have been calculated using the quantum defect orbital theory and the Cowan code for the 3d4s(2)-3d4s4p, 3d(2)4s-3d(2)4p, and 3d4s(2)-4s(2)4p transitions. In addition, a parametric analysis of the fine structure for the 3d4s(2) configuration of even parity is performed using Cowan code. The transition probabilities and the oscillator strengths obtained in this work are mostly in agreement with the data obtained from different theoretical works given in the literature. Moreover, transition probabilities for 24 levels of neutral scandium are given for the first time.
