Papuccuoglu, H. | Borak, F.

Article | 2005 | Journal of Thermophysics and Heat Transfer19 ( 2 ) , pp.172 - 177

An alternative fragmentation theory is suggested for the triggering stage of the steam explosion phenomenon. When model equations are solved under conditions of large-scale steam explosion experiments, the heat transfer coefficient is calculated as 25.1 × 106 W · m -2K-1. It is shown that fast steam production based on the mentioned heat transfer coefficient can lead to the occurrence of a shock wave, which is one of the necessary conditions to have a large-scale steam explosion. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Güler, N. | Çildir, S. | Iseri, U. | Sandalli, N. | Dilek, O.

Article | 2005 | Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology99 ( 5 ) , pp.172 - 177

Bilateral migration of teeth into the coronoid process in a patient with ectodermal dysplasia has not been reported in the literature except one report in which severe hypodontia and bilaterally ectopic impacted teeth in the coronoid processes of a nonsyndromic patient occurred. This article presents a 15-year-old female with hypohidrotic ectodermal dysplasia who had surgical removal of bilaterally impacted teeth in the coronoid process and was rehabilitated with a dental implant-retained fixed prosthesis in the mandible and over-denture in the maxilla. © 2005 Elsevier Inc. All rights reserved.

Özean, E.

Conference Object | 2005 | Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)3733 LNCS , pp.482 - 492

Nurse rostering problems represent a subclass of scheduling problems that are hard to solve. The goal is finding high quality shift and resource assignments, satisfying the needs and requirements of employees as well as the employers in healthcare institutions. In this paper, a real case of a nurse rostering problem is introduced. Memetic Algorithms utilizing different type of promising genetic operators and a self adaptive violation directed hierarchical hill climbing method are presented based on a previously proposed framework. © Springer-Verlag Berlin Heidelberg 2005.

Şişbot, S.

Article | 2005 | Flow Measurement and Instrumentation16 ( 1 ) , pp.27 - 34

Auto-correlation and cross-correlation techniques have been favored by engineers and scientists as powerful analysis tools, especially when noise is present in the system. Since cross-correlation and power spectral density functions are tightly coupled, cross-correlation is a well suited instrument for the analysis of time invariant systems. This paper discusses the conditions under which cross-correlation techniques can be used to identify a system model. Random signals, either arbitrarily generated or inherent in the systems, can be used as test signals for the purpose of identification. A real time cross-correlator is designed an . . .d used to evaluate blood carrying vessels for the purpose of flow measurement in extra-corporeal circuits. Naturally occurring random signals due to 'impurities' in the blood such as red and white blood cells are correlated by means of two pairs of ultrasonic sensors. The correlation functions obtained under different flow rates manifest themselves as unit impulse responses of the fluid system between upstream and downstream sensors. The results obtained were evaluated for accurate modeling of the fluid path and transit time flow measurement. © 2004 Elsevier Ltd. All rights reserved Daha fazlası Daha az

Ulug, U. | Ben-Shlomo, I. | Tosun, S. | Erden, H.F. | Akman, M.A. | Bahceci, M.

Article | 2005 | Journal of Assisted Reproduction and Genetics22 ( 4 ) , pp.167 - 171

Purpose: To evaluate the outcome of women with hypogonadotropic hypogonadism undergoing in-vitro fertilization (IVF). Methods: We retrospectively assessed outcomes in 58 women with hypogonadotropic hypogonadism (HH) and, as matched controls, in 116 women with tubal factor (TF) infertility who underwent assisted reproduction treatment (ART). For ovulation induction, human menopausal gonadotropin (hMG) was used in HH patients and a combination of hMG and gonadotropin releasing hormone (GnRH) agonist was used in TF patients. Conception and implantation rates, as well as duration of stimulation and number of oocytes retrieved, were the . . .main outcome measures. Results: Of the 58 HH patients, 53 (91.3%) responded adequately to ovulation induction and underwent ET. A larger amount of gonadotropins and a longer duration of ovarian stimulation were needed in HH patients than in TF patients. The mean number of retrieved oocytes and implantation rates did not differ between the groups. In addition, there were no differences between the HH and TF groups in pregnancy (53.8 vs. 48.6%) and multiple pregnancy (63.4 vs. 48.4%) rates. In the HH group, the miscarriage rate was 3.4%, and none of these patients developed severe OHSS. Conclusion: IVF in HH patients, in which there was a background of previous failed ovulation induction, was as successful as in women with TF infertility. © 2005 Springer Science+Business Media, Inc Daha fazlası Daha az

Yildirim, H. | Gungor, S. | Cihangiroglu, M.M. | Aygun, A.D.

Article | 2005 | Journal of Ultrasound in Medicine24 ( 5 ) , pp.623 - 627

Objective. The purpose of this study was to establish normative data for the flow velocity waveform indices of the renal arteries in the neonatal population and to evaluate the differentiation between birth weight and gestational age of neonates. Methods. Color sonography was performed in 65 neonates on the fifth day of life. Mean flow velocity was assessed, and measurements of the systolic/diastolic velocity ratio, resistive index, and pulsatility index were performed by online calculation. Results. All established values of renal arteries showed no significant differences in the right and left kidneys (P > .05). These values were . . .not correlated with gestational age and birth weight (P > .05). Conclusions. Peak systolic velocity, systolic/diastolic velocity ratio, and resistive index and pulsatility index values remain stable despite gestational age or birth weight and not different between the right and left kidneys. © 2005 by the American Institute of Ultrasound in Medicine Daha fazlası Daha az

Çaglar, E. | Sandalli, N. | Twetman, S. | Kavaloglu, S. | Ergeneli, S. | Selvi, S.

Article | 2005 | Acta Odontologica Scandinavica63 ( 6 ) , pp.317 - 320

Probiotic bacteria are thought to reduce the risk of disease. Previous studies have suggested that lactobacilli-derived probiotics in dairy products may affect the oral ecology, but the effect of bifidobacteria has not previously been reported. The aim of the present study was to examine whether or not short-term consumption of yogurt containing bifidobacteria would affect the salivary levels of mutans streptococci and lactobacilli in young adults. A double-blind, randomized crossover study was performed and 21 healthy subjects were followed over four periods. During periods 2 and 4 (2 weeks each), they ingested 200 g yogurt contain . . .ing Bifidobacterium DN-173 010 once daily or a control yogurt without viable bacteria. Periods 1 and 3 were run-in and washout periods, respectively. Salivary mutans streptococci and lactobacilli were enumerated with chair-side kits. A statistically significant reduction (p < 0.05) of salivary mutans streptococci was recorded after the probiotic yogurt consumption, which was in contrast to the controls. A similar trend was seen for lactobacilli, but this decrease failed to reach statistical significance. In conclusion, probiotic bifidobacteria in yogurt may reduce the levels of selected caries-associated microorganisms in saliva. © 2005 Taylor & Francis Daha fazlası Daha az

Keskin, A.Ü.

Article | 2005 | International Journal of Electronics92 ( 8 ) , pp.479 - 487

In this paper, voltage-mode second order high-Q band pass filters and oscillators which employ only single current differencing buffered amplifier (CDBA) as the active component are proposed. One of the four filter circuits and two of the four oscillators described have minimum passive component count properties, without using the internal pole of the active element. These BP filters can be easily cascaded without any recourse to impedance matching circuitry. The circuits have been analysed theoretically, simulated and experimentally tested in a laboratory. It is shown that the results of simulations and experimental work are in agr . . .eement with theoretical predictions Daha fazlası Daha az

Mirik, M. | Baloglu, S. | Aysan, Y. | Cetinkaya-Yildiz, R. | Kusek, M. | Şahin, Fikrettin

Article | 2005 | Plant Pathology54 ( 2 ) , pp.479 - 487

[No abstract available]

Kaplan, M. | Topsakal, C. | Cihangiroglu, M.

Article | 2005 | Pediatric Neurosurgery42 ( 1 ) , pp.65 - 66

Hemorrhage into the abscess cavity is a complication of brain abscess. It has been reported to be due to inflammation which results in the damage of the fragile neovasculature of the abscess wall. Hypoxia caused by Fallot's tetralogy or other congenital heart diseases facilitates the damage of these vessels with the lacking supportive tissues, and in turn intracavital bleeding. Copyright © 2006 S. Karger AG.

Bayrakçeken, Fuat | Ünlügedik, A. | Hayvali, M. | Yaman, A.

Article | 2005 | Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy61 ( 9 ) , pp.2109 - 2114

o-Xylene sensitized biacetyl fluorescence and phosphorescence have been investigated and photosensitized fluorescence and phosphorescence lifetimes of biacetyl in the vapor phase have been determined. Attempts to detect the triplet of biacetyl by its absorption spectrum were unsuccessful, primarily due to, it is believed, the low extinction coefficients of the triplet, and the low triplet concentrations produced by the optical pumping device at room temperature. © 2004 Elsevier B.V. All rights reserved.

Kurnaz, Aksan Işıl

Article | 2005 | Turkish Journal of Biology29 ( 4 ) , pp.189 - 195

Sinir hücresi farklılaşması işlemi pek çok açıdan oldukça detaylı olarak çalışılmıştır. PCI2 sisteminde, NGF'in sinir hücresi farklılaşmasını indükiediği hem nörit uzantıları hem de nöronai işaret anlatımı ölçülmek suretiyle gösterilmiştir. Bu etkinin ana olarak Ras/MAPK yolağı tarafından ortaya çıkarıldığı bilinmekle birlikte, başka yolakların da bu hücresel tepkide büyük rol oynadığından şüphelenilmektedir. Bu yolaklardan bir tanesi Smad sinyallemesidir - NGF'in daha önce TGF-p sinyalinin anlatımına sebep olduğu gösterilmiştir ancak bunun fizyolojik önemi tam olarak anlaşılamamıştır. Bu çalışmada biz çeşitli TGF-p yolak elemanları . . .nın anlatım profillerini inceleyerek bu yolağın NGF-indüklü PC12 farklılaşmasında olası işbirliğini anlamaya çalışmaktayız. The neuronal differentiation process has been studied in great detail from many aspects. In the PC12 system, NGF was found to induce neuronal differentiation as measured by neurite extensions and neuronal marker expression. This effect was seen to be mainly conducted through the Ras/MAPK pathway; however, additional pathways are suspected to play a significant role in this cellular response. One such pathway is Smad signaling - NGF was previously reported to induce the expression of the TGF-p signal, although the physiological relevance of this was not completely understood. In this study, we analyzed the expression profiles of several TGF-p pathway components, in an attempt to understand the potential role of this pathway in NGF-induced differentiation of PCI 2 cells Daha fazlası Daha az