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World Journal of Cardiovascular Diseases 2013年第6期3卷 412-413页

作者： Habib Cakir Yüksel Besir Ismail Yurekli Koksal Donmez Ersin Celik Mert Kestelli ufuk yetkin Ali Gurbuz Department of Cardiovascular Surgery Katip Celebi University Izmir Ataturk Training and Research Hospital Izmir Turkey

Postopereative sternal dehiscence is one of the most important complications of median sternotomy which may cause pulmonary dysfunction and mediastinitis. We are reporting a patient with sternal dehiscence after coronary artery bypass surgery that underwent application of thermoreactive nitinol clips in addition to Robicsek procedure. Using thermoreactive nitinol clips method together with Robicsek procedure may be a valuable technique for preventing recurrent sternal dehiscence for patients who are candidates of noninfective recurrent sternal dehiscence.

关键词： Sternal Dehiscence Robicsek Procedure Thermoreactive Nitinol Clips

The Effects of Clamp and Shunt Usage on Vascular Endothelium in Coronary Artery Bypass Grafting Surgery

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World Journal of Cardiovascular Surgery 2013年第7期3卷 225-226页

作者： Habib Cakir Ismail Yürekli Koksal Donmez Yuksel Besir Mert Kestelli Ersin Celik Banu Bahriye Akdag Lafci ufuk yetkin Ali Gürbüz Cardiovascular Surgery Katip Celebi Universitesi Ataturk Education and Training Hospital Izmir Turkey Department of Cardiovascular Surgery Izmir Atatürk Education and Research Hospital Izmir Turkey

In this review we aimed to present the effects of clamp and shunt usage on vascular endothelium in coronary artery surgery under the light of current literature data. Each surgical team or even each surgeon uses different methods in order to create bloodless surgical site during beating heart surgical procedures. Every method has its own advantages and disadvantages. There is no formed consensus regarding this issue. Surgeons still want to operate on bloodless surgical fields. But, they have concerns about continuity of blood flow and vascular endothelial injury during off-pump coronary surgery. In order to achieve a consensus statement about this issue, multicentric larger studies are needed.

关键词： Coronary Artery Bypass Surgery Shunt Endothelial Injury Clamp

Development of an aftershock occurrence model calibrated for Turkey and the resulting likelihoods

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 149-160页

作者： Ziya Muderrisoglu ufuk Yazgan Department of Civil Engineering Beykent UniversityIstanbulTurkey(formerly at Istanbul Technical University Earthquake Engineering and Disaster Management Institute Istanbul Technical UniversityIstanbulTurkey

This paper presents the calibration of Omori’s aftershock occurrence rate model for Turkey and the resulting likelihoods. Aftershock occurrence rate models are used for estimating the probability of an aftershock that exceeds a specific magnitude threshold within a time interval after the mainshock. Critical decisions on the post-earthquake safety of structures directly depend on the aftershock hazard estimated using the occurrence model. It is customary to calibrate models in a region-specific manner. These models depend on rate parameters(a, b, c and p) related to the seismicity characteristics of the investigated region. In this study, the available well-recorded aftershock sequences for a set of Mw ≥ 5.9 mainshock events that were observed in Turkey until 2012 are considered to develop the aftershock occurrence model. Mean estimates of the model parameters identified for Turkey are a =-1.90, b = 1.11, c = 0.05 and p = 1.20. Based on the developed model, aftershock likelihoods are computed for a range of different time intervals and mainshock magnitudes. Also, the sensitivity of aftershock probabilities to the model parameters is investigated. Aftershock occurrence probabilities estimated using the model are expected to be useful for post-earthquake safety evaluations in Turkey.

关键词： aftershock occurrence model aftershock likelihoods rate parameters aftershock hazard

Dark sector production and baryogenesis from not quite black holes

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Chinese Physics C 2021年第7期45卷 305-324页

作者： ufuk Aydemir Jing Ren Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Primordial black holes have been considered attractive dark matter candidates,whereas some of the predictions rely heavily on the near-horizon physics that remains to be tested *** a concrete alternative,thermal 2-2-holes closely resemble black holes without event *** a probable endpoint of gravitational collapse,they provide a solution to the information loss problem but also naturally result in stable ***,we have considered primordial 2-2-hole remnants as dark *** to the strong constraints from a novel phenomenon associated with remnant mergers,only small remnants with mass approximate to the Planck mass can constitute all dark *** this paper,we examine the scenario in which the majority of dark matter consists of particles produced by the evaporation of primordial 2-2-holes,whereas the remnant contribution is *** products with sufficiently light mass may contribute to the number of relativistic degrees of freedom in the early universe,which we also ***,2-2-hole evaporation can produce particles that are responsible for the baryon *** observe that baryogenesis through direct B-violating decays or through leptogenesis can both be ***,the viable parameter space for the Planck remnant scenario is similar to that of primordial black holes with Planck ***,heavier remnants result in different predictions,and the viable parameter space remains large even when the remnant abundance is small.

关键词： 2-2-hole remnant quadratic gravity horizonless ultracompact object primordial black hole thermal radiation dark matter dark radiation baryogenesis leptogenesis

Upper crustal Poisson's ratio and coda-wave attenuation beneath Eastern Anatolia

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Earthquake Engineering and Engineering Vibration 2020年第2期19卷 335-347页

作者： ufuk Aydin Sakir Sahin Mohamed K.Salah Atatürk University Oltu Faculty of Earth SciencesMining EngineeringErzurumTurkey Geophysical Engineering Department SDUEngineering and Architecture FacultyIspartaTurkey Department of Geology American University of BeirutRiad El Solh 11072020BeirutLebanon

The attenuation of seismic waves reflects the elastic nature of the media within which the waves *** this study,we calculate the Coda-Q(Qc),frequency dependence(η),Vp/Vs and Poisson's(υ)ratios by using 2621 vertical component seismograms generated by 987 earthquakes recorded by 13 seismic stations in Eastern Anatolia,and creat a 2-D seismic tomographic Qc model for the *** obtained model provides significant information for exploring the boundaries of adjacent tectonic units within the upper crust and interpreting their dynamic *** 2-D Qc model and the other parameters are consistent with the seismotectonic features of Eastern *** heterogeneous Qc values are observed in the study area dividing it into north-south directed bands of low and high *** highestηvalues were obtained beneath the northwestern and eastern parts of the study ***,high and lowυvalues are obtained in the western and eastern parts of the study area,*** spatial variations in the measured parameters are consistent with many geophysical observations including low Pn velocities,efficient Sn blockage,high heat flow,and widespread *** upper crustal thicknesses and inhomogeneous stress distribution along the East and North Anatolian Fault Zones may also contribute to the observed heterogeneities.

关键词： Coda-Q(Qc) Eastern Anatolia Poisson's ratio(υ) seismotectonics upper crustal structure

Yellowing of fresh-cut spinach(Spinacia oleracea L.)leaves delayed by UV-B applications

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Information Processing in Agriculture 2017年第3期4卷 214-219页

作者： M.ufuk Kasim Rezzan Kasim Kocaeli University Graduate School of Natural and Applied Sciences Vocational School of Arslanbey41285 KartepeKocaeliTurkiye

In present work,the effects of UV-B treatments on quality of fresh-cut spinach leaves were *** this purpose,spinach leaves grown in glasshouse were harvest,cleaned and placed into polystyrene foam dishes and wrapped by stretch *** packaging,freshcut spinach leaves were treated with UV-B irradiation and were stored at 5℃ temperature for 12 *** soluble solids,visual quality,L^*a^*b^* values,and also hue angle values of samples were determined during *** soluble solids content of samples in control group has been higher than those from samples in UV-B treatments,however,visual quality was lower than the other *** to L*values of the samples,it is found that lower ultraviolet irratiation(UV-B)treatments caused yellowing of samples,and also same result was obtained by b^* and a^* values of fresh-cut spinach ***,hue angles values of samples treated with UV-B for 6min was higher compared with the other ***,yellowing of fresh-cut spinach leaves was decreased,and visual quality scores of samples was increased through ultraviolet irradiation treatments.

关键词： Spinach Fresh-cut Ultraviolet irradiation(UV-B) Yellowing

MOTIONS OF CURVES IN THE GALILEAN SPACE G_3

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Acta Mathematica Scientia 2015年第5期35卷 1046-1054页

作者： ufuk OZTURK Suleyman CENGIZ Esra Betul KOC OZTURK Department of Mathematics Faculty of Science ank?r? Karatekin University

In this article, we study the flows of curves in the Galilean 3-space and its equiform geometry without any constraints. We find that the Frenet equations and the intrinsic quantities of the inelastic flows of curves are independent of time. We show that the motion of curves in the Galilean 3-space and its equiform geometry are described by the inviscid and viscous Burgers＇ equations.

关键词： Galilean geometry equiform geometry motions of curves inextensible flows Burgers' equation Frenet frames

Evaluation of botanicals as potential COVID-19 symptoms terminator

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World Journal of Gastroenterology 2021年第39期27卷 6551-6571页

作者： ufuk Koca Caliskan Methiye Mancak Karakus Department of Pharmacognosy and Pharmaceutical Botany Gazi UniversityAnkara 06500Turkey

Information about the coronavirus disease 2019(COVID-19)pandemic is still evolving since its appearance in December 2019 and has affected the whole ***,a search for an effective and safe treatment for COVID-19 *** mixtures contain secondary metabolites(such as flavonoids,phenolics,alkaloids,essential oils etc.)with many therapeutic *** this study,the use of herbal treatments against COVID-19 was *** synthetic drugs focus mainly on respiratory symptoms,however herbal therapy with plant extracts may be useful to relieve overall symptoms of COVID-19 due to the variety of bioactive *** COVID-19 is a virus that affects the respiratory tract,the antiviral effects of botanicals/plants against respiratory viruses have been examined through clinical *** about COVID-19 patients revealed that the virus not only affects the respiratory system but different organs including the gastrointestinal(GI)*** GI symptoms seriously affect quality of life,herbal options that might eliminate these problems were also ***,computer modeling studies of plants and their active compounds on COVID-19 were *** summary,herbal therapies were identified as potential options for both antiviral effects and control of COVID-19 *** data will be needed to enlighten all aspects of COVID-19 pathogenesis,before determining the effects of plants on severe acute respiratory syndrome coronavirus 2.

关键词： COVID-19 Herbal therapies Plant SARS-CoV-2 Antiviral Symptom

Seismic performance of buildings during 2011 Van earthquakes and rebuilding efforts

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 591-606页

作者： ufuk Yazgan Resat Oyguc M. Ertac Erguven and Zekai Celep Earthquake Engineering and Disaster Management Institute Istanbul Technical University Istanbul Turkey Department of Civil Engineering Faculty of Civil Engineering Istanbul Technical University Istanbul Turkey

The October 23, 2011 M7.2 Tabanli - Van and November 9, 2011 M5.2 Edremit - Van earthquakes caused damage in a widespread area across the Van province in Turkey. The ground motions, the damage caused by these earthquakes and the recent progress related to recovery efforts are presented herein. First, the key properties of the recorded strong ground motions like spectral amplitudes and directionality are evaluated. The observed damage in the affected reinforced concrete and masonry structures are discussed. The set of common structural damage mechanisms （i.e., soft story failure, torsional response due to plan irregularity, short column failure, pull out failure, pounding） observed in the damaged buildings were identified. The relationship between the key structural properties and the extent of damage is investigated. The primary loss drivers across the region were identified to be the poor quality of workmanship and improper use of building materials. The results from the investigation suggest that a large portion of the loss could have been prevented if sufficient attention and care were given to the implementation of the design regulations and in particular to the construction practice. Lastly, the recent progress in the ongoing rebuildin~ activities is presented.

关键词： Van 2011 earthquakes seismic damage reconnaissance survey rebuilding effort

Relationship between intestinal microbiota and colorectal cancer

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World Journal of Gastrointestinal Oncology 2015年第10期7卷 233-240页

作者： Gokhan Cipe ufuk Oguz Idiz Deniz Firat Huseyin Bektasoglu Department of General Surgery Fatih University Department of General Surgery Bezmialem Vakif University

The human gastrointestinal tract hosts a complexand vast microbial community with up to 1011-1012 microorganisms colonizing the colon. The gut microbiota has a serious effect on homeostasis and pathogenesis through a number of mechanisms. In recent years, the relationship between the intestinal microbiota and sporadic colorectal cancer has attracted much scientific interest. Mechanisms underlying colonic carcinogenesis include the conversion of procarcinogenic diet-related factors to carcinogens and the stimulation of procarcinogenic signaling pathways in luminal epithelial cells. Understanding each of these mechanisms will facilitate future studies, leading to the development of novel strategies for the diagnosis, treatment, and prevention of colorectal cancer. In this review, we discuss the relationship between colorectal cancer and the intestinal microbiota.

关键词： Sporadic Colorectal Cancer Intestinal Microbiota