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COPOLYMERS OF 2-ACRYLAMIDO-2-METHYL-1-PROPANESULFONIC ACID/MALEIC ACID:SYNTHESIS,CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY

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Chinese Journal of Polymer Science 2007年第5期25卷 491-500页

作者： Cengiz Soykan Ramazan Coskun ali Delibas Ertan sahin Department of Chemistry Faculty of Science and Arts University of Bozok Yozgat Turkey Department of Chemistry Faculty of Science and Arts University of Ataturk Erzurum Turkey

2-Acrylamido-2-methyl-1-propanesulfonic acid （AMPS）, and maleic acid （MA） copolymerized with different feed ratios using N,N-dimethylformamide as a solvent and benzoyl peroxide （Bz2O2） as an initiator at 70℃. Structure and composition of copolymers for a wide range of monomer feed were determined by elemental analysis （content of N for AMPS-units）. Monomer reactivity ratios for AMPS （M1）-MA （M2） pair were determined by the application of conventional linearization methods such as Fineman-Ross （F-R）, Kelen-Tudos（KT） and Extended Kelen-Tudos （EKT） and a nonlinear error invariable model method using a computer program RREVM. The characterizations were done by Fourier transform infrared spectroscopy （FTIR）, differential scanning calorimetry （DSC） thermal gravimetry analysis （TGA）, and and X-ray diffraction. The antimicrobial effects of polymers were also tested on various bacteria, and yeast.

关键词： Poly(2-acrylamido-2-methyl-l-propanesulfonic acid-co-maleic acid) Thermogravimetric analysis SEM analysis Monomer reactivity ratios.

Production and Mechanical Behaviour of Biomedical CoCrMo Alloy

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Chinese Physics Letters 2011年第12期28卷 215-218页

作者： O.sahin A.Rıza Tuncdemir H.ali Cetinkara H.Salih Guder E.sahin Department of Physics Art and Science FacultyMicro/Nanomechanic Characterization LaboratoryMustafa Kemal UniversityHatayTurkey Department of Prosthetic Dentistry Dentistry FacultyMustafa Kemal UniversityHatayTurkey

Cobalt-based alloy(Co-30Cr-5.5Mo)is produced by the investment casting *** alloy complies with the ASTM F75 standard and is widely used in the manufacturing of orthopedic implants because of its high strength,good corrosion resistance and excellent biocompatibility ***,XRD and microhardness tests are used to examine the mechanical properties of the *** examined material exhibits the behaviour of indentation size effect(ISE).Our results reveal that Vickers and Knoop microhardness are dependent on indentation test *** traditional Meyer's law,the proportional specimen resistance(PSR)model and the Hays-Kendall model(HK)are used to analyze the load dependence of the *** a result,the Hays-Kendall model is found to be the most effective to determine the load-independent hardness HLI of CoCrMo alloy.

关键词： alloy resistance process

Investigation of performance and emission characteristics of waste cooking oil as biodiesel in a diesel engine

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Petroleum Science 2018年第2期15卷 396-404页

作者： Yahya Ulusoy Rldvan Arslan Yucel Tekin ali Surmen Alper Bolat Remzi sahin Department of Agricultural Machinery/Automotive Technology Uludag UniversityBursaTurkey Department of Automotive Engineering Uludag UniversityBursaTurkey Turk Traktor ve Ziraat Makineleri Co. AnkaraTurkey Department of Mechanical Engineering KTO Karatay UniversityKonyaTurkey

Biodiesel is one of the most popular prospective alternative fuels and can be obtained from a variety of sources. Waste frying oil is one such source along with the various raw vegetable oils. However, some specific technical treatments are required to improve certain fuel properties such as viscosity and calorific value of the biodiesel being obtained from waste cooking oil methyl ester （WCOME）. Various treatments are applied depending on the source and therefore the composition of the cooking oil. This research investigated the performance of WCOME as an alternative biofuel in a four-stroke direct injection diesel engine. An 8-mode test was undertaken with diesel fuel and five WCOME blends. The best compromise blend in terms of performance and emissions was identified. Results showed that energy utilization factors of the blends were similar within the range of the operational parameters （speed, load and WCOME content）. Increasing biodiesel content produced slightly more smoke and NOx for a great majority of test points, while the CO and THC emissions were lower.

关键词： Waste cooking oil Methyl ester Biodiesel Alternative fuels Vehicle emissions

Seismic performance of non-structural components and contents in buildings: an overview of NZ research

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Earthquake Engineering and Engineering Vibration 2016年第1期15卷 1-17页

作者： Rajesh P Dhakal Atefeh Pourali ali sahin Tasligedik Trevor Yeow Andrew Baird Gregory Mac Rae Stefano Pampanin Alessandro Palermo Department of Civil and Natural Resources Engineering University of Canterbury UC Quake Centre University of Canterbury BECA

This paper summarizes the research on non-structural elements and building contents being conducted at University of Canterbury in New Zealand. Since the 2010-2011 series of Canterbury earthquakes, in which damage to non-structural components and contents contributed heavily to downtime and overall financial loss, attention to seismic performance and design of non-structural components and contents in buildings has increased exponentially in NZ. This has resulted in an increased allocation of resources to research leading to development of more resilient non-structural systems in buildings that would incur substantially less damage and cause little downtime during earthquakes. In the last few years, NZ researchers have made important developments in understanding and improving the seismic performance of secondary building elements such as partitions, facades, ceilings and contents.

关键词： non-structural elements building contents drywall partition cladding suspended ceilings seismicperformance assessment fragility analysis experimental evaluation loss estimation

Chiral exceptional point and coherent suppression of backscattering in silicon microring with low loss Mie scatterer

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eLight 2023年第1期3卷 66-74页

作者： Hwaseob Lee ali Kecebas Feifan Wang Lorry Chang sahin K.Ozdemir Tingyi Gu Department of Electrical and Computer Engineering University of DelawareNewarkDE 19716USA Department of Engineering Science and Mechanics Pennsylvania State UniversityUniversity ParkPA 16802USA Materials Research Institute Pennsylvania State UniversityUniversity ParkPA 16802USA

Non-Hermitian systems with their spectral degeneracies known as exceptional points(EPs)have been explored for lasing,controlling light transport,and enhancing a sensor’s response.A ring resonator can be brought to an EP by controlling the coupling between its frequency degenerate clockwise and counterclockwise traveling *** has been typically achieved by introducing two or more nanotips into the resonator’s mode *** this method provides a route to study EP physics,the basic understanding of how the nanotips’shape and size symmetry impact the system’s non-Hermicity is missing,along with additional loss from both in-plane and out-of-plane *** limited resonance stability poses a challenge for leveraging EP effects for switches or modulators,which requires stable cavity resonance and fixed laser-cavity *** we use lithographically defined asymmetric and symmetric Mie scatterers,which enable subwavelength control of wave transmission and reflections without deflecting to additional radiation *** show that those pre-defined Mie scatterers can bring the system to an EP without post tuning,as well as enable chiral light transport within the ***,the Mie scatterer results in enhanced quality factor measured on the transmission port,through coherently suppressing the backscattering from the waveguide surface *** proposed device platform enables pre-defined chiral light propagation and backscattering-free resonances,needed for various applications such as frequency combs,solitons,sensing,and other nonlinear optical processes such as photon blockade,and regenerative oscillators.

关键词： Non-Hermicity Exceptional point Mie scatterers Microring resonator Silicon photonics

Effect of the COVID-19 pandemic on patients with presumed diagnosis of acute appendicitis

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World Journal of Clinical Cases 2022年第29期10卷 10487-10500页

作者： Sami Akbulut Adem Tuncer Zeki Ogut Tevfik Tolga sahin Cemalettin Koc Emek Guldogan Ertugrul Karabulut Elif Seren Tanriverdi ali Ozer Surgery and Liver Transplant Institute Inonu University Faculty of MedicineMalatya 44280Turkey Department of Biostatistics and Medical Informatics Inonu University Faculty of MedicineMalatya 44280Turkey Department of Public Health Inonu University Faculty of MedicineMalatya 44280Turkey Department of Surgery Inonu University Faculty of MedicineMalatya 44280Turkey Department of Medical Microbiology Inonu University Medical FacultyMalatya 44280Turkey

BACKGROUND Acute appendicitis(AAp) is the most frequent cause of acute abdominal pain,and appendectomy is the most frequent emergency procedure that is performed *** coronavirus disease 2019(COVID-19) pandemic has caused delays in managing diseases requiring emergency approaches such as AAp and *** To compare the demographic,clinical,and histopathological outcomes of patients with AAp who underwent appendectomy during pre-COVID-19 and COVID-19 *** The demographic,clinical,biochemical,and histopathological parameters were evaluated and compared in patients who underwent appendectomy with the presumed diagnosis of AAp in the pre-COVID-19(October 2018-March 2020) and COVID-19(March 2020-July 2021) *** Admissions to our tertiary care hospital for AAp increased 44.8% in the COVID-19 ***-19(n = 154) and COVID-19(n = 223) periods were compared for various parameters,and we found that there were statistically significant differences in terms of variables such as procedures performed on the weekdays or weekends [odds ratio(OR):1.76;P = 0.018],presence of AAp findings on ultrasonography(OR:15.4;P < 0.001),confirmation of AAp in the histopathologic analysis(OR:2.6;P = 0.003),determination of perforation in the appendectomy specimen(OR:2.2;P = 0.004),the diameter of the appendix(P < 0.001),and hospital stay(P = 0.003).There was no statistically significant difference in terms of interval between the initiation of symptoms and admission to the hospital between the pre-COVID-19(median:24 h;interquartile range:34) and COVID-19(median:36 h;interquartile range:60) periods(P = 0.348).The interval between the initiation of symptoms until the hospital admission was significantly longer in patients with perforated AAp regardless of the COVID-19 or pre-COVID-19 status(P < 0.001).CONCLUSION The present study showed that in the COVID-19 period,the ultrasonographic determination rate of AAp,perforation rate of AAp,and duration of hospital

关键词： SARS-CoV-2 COVID-19 pandemic Acute appendicitis Perforated appendicitis Negative appendectomy

Erectile function and late-onset hypogonadism symptoms related to lower urinary tract symptom severity in elderly men

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Asian Journal of Andrology 2013年第6期15卷 785-789,I0008页

作者： Ozan Bozkurt Deniz Bolat Omer Demir Oktay Ucer ali sahin Burak Ozcift Abdulkadir Pekta Tahir Turan Bilal H Gümü Ertan Cans Ahmet Bolukbasi Haluk Erol Adil Esenx Department of Urology Dokuz Eylul University Faculty of Medicine Izmir 35340 Turkey Division of Urology Doc. Dr. Yasar Eryilmaz Dogubayazit State Hospital Agri 04900 Turkey Department of Urology Celal Bayar University Manisa 45040 Turkey Department of Urology Sifa University Izmir 35230 Turkey Clinic of Urology Ataturk Training and Research Hospital Izmir 35965 Turkey Division of Urology Adiyaman 82. Yll State Hospital Adiyaman 02040 Turkey Department of Urology Pamukkale University Faculty of Medicine Denizli 20020 Turkey Clinic of Urology Tepecik Training and Research Hospital Izmir 35120 Turkey Department of Urology Adnan Menderes University Faculty of Medicine Aydin 09100 Turkey

The aim of this study was to evaluate the relationship between lower urinary tract symptoms （LUTSs）, erectile dysfunction （ED） and symptomatic late-onset hypogonadism （SLOH） in ageing men in the Aegean region of Turkey. Five hundred consecutive patients 〉40 years old who had been in a steady sexual relationship for the past 6 months and were admitted to one of six urology clinics were included in the study. Serum prostate-specific antigen and testosterone levels and urinary flow rates were measured. All patients filled out the International Prostate Symptom Score and Quality of Life （IPSS-QoL）, International Index of Erectile Function （IIEF） and Aging Males＇ Symptoms （AMS） scale forms. Of the patients, 23.9% had mild LUTSs, 53.3% had moderate LUTSs and 22.8% had severe LUTSs. The total testosterone level did not differ between groups. Additionally, 69.6% had ED. The presence of impotence increased with increasing LUTS severity. Symptomatic late-onset hypogonadism （AMS 〉27） was observed in 71.2% of the patients. The prevalence of severe hypogonadism symptoms increased with the IPSS scores. A correlation analysis revealed that all three questionnaire scores were significantly correlated. In conclusion, LUTS severity is an age-independent risk factor for ED and SLOH. LUTS severity and SLOH symptoms appear to have a strong link that requires etiological and biological clarification in future studies.

关键词： ageing male erectile dysfunction lower urinary tract symptoms symptomatic late-onset hypogonadism symptom scores testosterone

Effect of preoperative immunonutrition and other nutrition models on cellular immune parameters

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World Journal of Gastroenterology 2009年第4期15卷 467-472页

作者： Yusuf Gunerhan Neset Koksal Umit Yasar sahin Mehmet ali Uzun Emel Ek■ioglu-Demiralp Department of Surgery Kafkas University Faculty of Medicine 2nd Department of General Surgery Haydarpasa Numune Training and Research Hospital Department of Surgery Esenler Basaksehir State Hospital Department of Hematology- Immunology Marmara University Faculty of Medicine

AIM:To evaluate the effects of preoperative immunonutrition and other nutrition models on the cellular immunity parameters of patients with gastrointestinal tumors before surgical *** addition,effects on postoperative complications were examined. METHODS:Patients with gastrointestinal tumors were randomized into 3 *** immunonutrition group received a combination of arginine,fatty acids and *** second and third group received normal nutrition and standard enteral nutrition,*** protocols were administered for 7 d prior to the *** parameters,in particular prealbumin levels and lymphocyte subpopulations(CD4+,CD8+,CD16+/56+,and CD69 cells)were evaluated before and after the nutrition *** were compared in terms of postoperative complications and duration of hospital stay. RESULTS:Of the 42 patients who completed thestudy,16 received immunonutrition,13 received normal nutrition and 13 received standard enteral nutrition. prealbumin values were low in every group,but this parameter was improved after the nutritional protocol only in the immunonutrition group(13.64±8.83 vs 15.98±8.66,P=0.037).Groups were similar in terms of CD4+,CD16+/56,and CD69+prior to the nutritional protocol;whereas CD8+was higher in the standard nutrition group compared to the immunonutrition *** nutritional protocols,none of the groups had an increase in their lymphocyte ***,groups did not differ in terms of postoperative complications and postoperative durations of hospital stay. CONCLUSION:Preoperative immunonutrition provided a significant increase in prealbumin levels,while it did not significantly alter T lymphocyte subpopulation counts,the rate of postoperative complications and the duration of hospital stay.

关键词： Malnutrition Gastrointestinal tumours Immunonutrition Prealbumin Lymphocyte subpopu-lations

Biomedical applications of engineered heparin-based materials

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Bioactive Materials 2024年第1期31卷 87-118页

作者： Ehsan Nazarzadeh Zare Danial Khorsandi Atefeh Zarepour Hulya Yilmaz Tarun Agarwal Sara Hooshmand Reza Mohammadinejad Fatma Ozdemir Onur sahin Sevin Adiguzel Haroon Khan ali Zarrabi Esmaeel Sharifi Arun Kumar Ebrahim Mostafavi Negar Hosseinzadeh Kouchehbaghi Virgilio Mattoli Feng Zhang Vadim Jucaud alireza Hassani Najafabadi ali Khademhosseini School of Chemistry Damghan UniversityDamghan36716-45667Iran Terasaki Institute for Biomedical Innovation Los AngelesCA90024United States Department of Biomedical Engineering Faculty of Engineering and Natural SciencesIstinye UniversitySariyerIstanbul34396Turkey Department of Basic Pharmacy Sciences Faculty of PharmacyIstinye UniversityIstanbulTurkey Department of Bio-Technology Koneru Lakshmaiah Education FoundationVaddeswaramAPIndia Nanotechnology Research and Application Center(SUNUM) Sabanci UniversityIstanbul34956Turkey Research Center of Tropical and Infectious Diseases Kerman University of Medical SciencesKermanIran Department of Pharmacy Abdul Wali Khan UniversityMardan23200Pakistan Department of Tissue Engineering and Biomaterials School of Advanced Medical Sciences and TechnologiesHamadan University of Medical SciencesHamadanIran Institute of Polymers Composites and Biomaterials-National Research Council(IPCB-CNR)Viale J.F.Kennedy 54-Mostra D’Oltremare pad.2080125NaplesItaly Department of Pharmacy School of Health SciencesCentral University of South BiharGaya824209India Department of Medicine Stanford University School of MedicineStanfordCA94305USA Stanford Cardiovascular Institute Stanford UniversitySchool of MedicineStanfordCA94305USA Istituto Italiano di Tecnologia Centre for Materials InterfacesViale Rinaldo Piaggio 34PontederaPisa56025Italy The Quzhou Affiliated Hospital of Wenzhou Medical University Quzhou People’s HospitalQuzhou324000ZhejiangChina

Heparin is a negatively charged polysaccharide with various chain lengths and a hydrophilic *** to its fascinating chemical and physical properties,nontoxicity,biocompatibility,and biodegradability,heparin has been extensively used in different fields of medicine,such as cardiovascular and *** review highlights recent and future advancements in designing materials based on heparin for various biomedical *** physicochemical and mechanical properties,biocompatibility,toxicity,and biodegradability of heparin are *** addition,the applications of heparin-based materials in various biomedical fields,such as drug/gene delivery,tissue engineering,cancer therapy,and biosensors,are ***,challenges,opportunities,and future perspectives in preparing heparin-based materials are summarized.

关键词： Heparin Nanomaterials Physicochemical Biological Preparation Biomedical applications