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S. Kalkan

E S Ozyurek, T Yoldemir, U Kalkan
Endometriosis is classically defined as a chronic, recurrent and progressive disease. It is known to be estrogen-dependent, but can still be observed during the peri- and postmenopausal periods. Medical management of endometriosis is palliative symptomatic relief. Surgery when properly and timely performed for the right person may treat endometriosis. However, there is always a risk of possible major or minor surgical complications, as well as loss of some functions due to nerve damage. Management of endometriosis in the woman approaching the end of her reproductive life may require special attention both due to the potential for recurrence and transformation into various endometriosis-associated malignancies...
March 1, 2018: Climacteric: the Journal of the International Menopause Society
H Aydın, S B Kalkan, C Varlikli, C Çelebi
We have investigated the effect of a poly (3-hexylthiophene-2.5-diyl)(P3HT)-graphene bilayer electrode on the photoresponsivity characteristics of Si-based Schottky photodetectors. P3HT, which is known to be an electron donor and absorb light in the visible spectrum, was placed on CVD grown graphene by dip-coating method. The results of the UV-vis and Raman spectroscopy measurements have been evaluated to confirm the optical and electronic modification of graphene by the P3HT thin film. Current-voltage measurements of graphene/Si and P3HT-graphene/Si revealed rectification behavior confirming a Schottky junction formation at the graphene/Si interface...
February 15, 2018: Nanotechnology
Cihan Yurdaydin, Onur Keskin, Çağdaş Kalkan, Fatih Karakaya, Aysun Çalişkan, Ersin Karatayli, Senem Karatayli, A Mithat Bozdayi, Christopher Koh, Theo Heller, Ramazan Idilman, Jeffrey S Glenn
BACKGROUND AND RATIONALE: In a proof-of-concept (POC) study, the oral prenylation inhibitor lonafarnib (LNF) decreased HDV RNA during 4 weeks of treatment. Here we explored optimal LNF regimens. METHODS: 15 patients (5 groups; 3 per group) completed dosing as follows: 1) LNF 200 mg BID (12 weeks); 2) LNF 300 mg BID (12 weeks); 3) LNF 100 mg TID (5 weeks); 4) LNF 100 mg BID + pegylated interferon alfa (PEG-IFNα) 180 mcg QW (8 weeks); and 5) LNF 100 mg BID + ritonavir (RTV) 100 mg QD (8 weeks)...
November 20, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
S Irtegun Kandemir, M A Tekin, M Bozkurt, A Z Dagli, S Kalkanli-Tas
Behçet's disease (BD) is achronic inflammatory disorder characterized by recurrent oral and genital ulcers, uveitis and skin lesions. Although,the pathogenesis of BD remains poorly understood, excessive or dysregulatedcytokine production including IL-10 is associated with BD. Revealing the key molecular mechanism by which IL-10 expression is regulated is crucial to understanding the pathogenesis of BD. The aim of this study was to investigate whether Src family kinases (SFKs) are upstream mediators of STAT3/IL-10 pathway in peripheral blood mono nuclear cells(PBMCs) of active BD patients...
October 31, 2017: Cellular and Molecular Biology
Mehmet Karakuş, Burçin Karabey, Şaban Orçun Kalkan, Güven Özdemir, Gizem Oğuz, Özge Erişöz Kasap, Bülent Alten, Seray Töz, Yusuf Özbel
Phlebotomine sand flies are hematophagous insects that harbor bacterial, viral and parasitic agents like Bartonella sp., Phleboviruses and Leishmania spp., respectively. There are few reports on bacterial microbiota of Phlebotomus (P.) papatasi but no data available for natural populations of Turkey, where leishmaniasis is endemic. Therefore, we aimed to investigate the midgut bacterial flora of different populations of P. papatasi. Sand flies were collected from different towns (Karaburun, Urla, Ayvacik and Başçayır) located in the western part of Turkey...
November 1, 2017: Scientific Reports
J L Ortiz, P Santos-Sanz, B Sicardy, G Benedetti-Rossi, D Bérard, N Morales, R Duffard, F Braga-Ribas, U Hopp, C Ries, V Nascimbeni, F Marzari, V Granata, A Pál, C Kiss, T Pribulla, R Komžík, K Hornoch, P Pravec, P Bacci, M Maestripieri, L Nerli, L Mazzei, M Bachini, F Martinelli, G Succi, F Ciabattari, H Mikuz, A Carbognani, B Gaehrken, S Mottola, S Hellmich, F L Rommel, E Fernández-Valenzuela, A Campo Bagatin, S Cikota, A Cikota, J Lecacheux, R Vieira-Martins, J I B Camargo, M Assafin, F Colas, R Behrend, J Desmars, E Meza, A Alvarez-Candal, W Beisker, A R Gomes-Junior, B E Morgado, F Roques, F Vachier, J Berthier, T G Mueller, J M Madiedo, O Unsalan, E Sonbas, N Karaman, O Erece, D T Koseoglu, T Ozisik, S Kalkan, Y Guney, M S Niaei, O Satir, C Yesilyaprak, C Puskullu, A Kabas, O Demircan, J Alikakos, V Charmandaris, G Leto, J Ohlert, J M Christille, R Szakáts, A Takácsné Farkas, E Varga-Verebélyi, G Marton, A Marciniak, P Bartczak, T Santana-Ros, M Butkiewicz-Bąk, G Dudziński, V Alí-Lagoa, K Gazeas, L Tzouganatos, N Paschalis, V Tsamis, A Sánchez-Lavega, S Pérez-Hoyos, R Hueso, J C Guirado, V Peris, R Iglesias-Marzoa
Haumea-one of the four known trans-Neptunian dwarf planets-is a very elongated and rapidly rotating body. In contrast to other dwarf planets, its size, shape, albedo and density are not well constrained. The Centaur Chariklo was the first body other than a giant planet known to have a ring system, and the Centaur Chiron was later found to possess something similar to Chariklo's rings. Here we report observations from multiple Earth-based observatories of Haumea passing in front of a distant star (a multi-chord stellar occultation)...
October 11, 2017: Nature
U Kalkan, T Yoldemir, E S Ozyurek, A Daniilidis
In pelvic organ prolapse, the anatomical defects develop at the anterior (anterior vaginal wall), the posterior (posterior vaginal wall) and the apical (the uterus/cervix or the apex of the vagina, vaginal vault or cuff scar after hysterectomy) compartments. These defects occur in more than one compartment. Treatment of pelvic organ prolapse is commonly surgical, aiming to restore the anatomy of structures supporting the pelvic organs. The surgical repair techniques are classified as 'native tissue repair (NTR)' when only pelvic organ support tissues are used and 'augmented repair (AR)' when some other material (prosthesis or graft) is used to reinforce the defective support system...
December 2017: Climacteric: the Journal of the International Menopause Society
Léa Tison, Sophie Holtz, Amy Adeoye, Önder Kalkan, Nina S Irmisch, Nadja Lehmann, Randolf Menzel
Learning and memory play a central role in the behavior and communication of foraging bees. We have previously shown that chronic uptake of the neonicotinoid thiacloprid affects the behavior of honey bees in the field. Foraging behavior, homing success, navigation performance and social communication were impaired. Thiacloprid collected at a feeding site at low doses accumulates in foragers over time. Here, we applied a laboratory standard procedure (the proboscis-extension response conditioning) in order to assess which processes, acquisition, memory consolidation and/or memory retrieval were compromised after bees were fed either with thiacloprid or the formulation of thiacloprid named Calypso(®) at different sublethal doses...
October 15, 2017: Journal of Experimental Biology
Kaustuv Sahoo, Sriharsha Karumuri, Rangika S Hikkaduwa Koralege, Nicholas H Flynn, Steve Hartson, Jing Liu, Joshua D Ramsey, A Kaan Kalkan, Carey Pope, Ashish Ranjan
Red blood cells (RBCs) express a variety of immunomodulatory markers that enable the body to recognize them as self. We have shown that RBC membrane glycophorin A (GPA) receptor can mediate membrane attachment of protein therapeutics. A critical knowledge gap is whether attaching drug-encapsulated nanoparticles (NPs) to GPA and modification with cell-penetrating peptide (CPP) will impact binding, oxygenation, and the induction of cellular stress. The objective of this study was to formulate copolymer-based NPs containing model fluorescent-tagged bovine serum albumin (BSA) with GPA-specific targeting ligands such as ERY1 (ENPs), single-chain variable antibody (scFv TER-119, SNPs), and low-molecular-weight protamine-based CPP (LNPs) and to determine their biocompatibility using a variety of complementary high-throughput in vitro assays...
June 21, 2017: Molecular Pharmaceutics
Göknur Kalkan, Havva Y Seçkin, İsmail Benli, Ali Akbaş, Ömer Ateş, Hüseyin Özyurt, Yalçın Baş, Atiye Oğrum, Günseli Ş Pancar
BACKGROUND: Although there have been significant advances for clarifying the pathogenesis of psoriasis, exact pathogenic mechanism of the disease is still unknown. Oxidative stress is considered to be a new aetiopathogenetic key factor in the pathogenesis of psoriasis, as a result of the studies performing the association between psoriasis and paraoxonase 1 (PON1) activity. In this study, we aimed to examine the possible associations between the both PON1 L55M and PON1 Q192R polymorphisms and psoriasis susceptibility and disease progression in Turkish population...
April 11, 2017: Giornale Italiano di Dermatologia e Venereologia: Organo Ufficiale, Società Italiana di Dermatologia e Sifilografia
Tüzer Kalkan, Nelly Olova, Mila Roode, Carla Mulas, Heather J Lee, Isabelle Nett, Hendrik Marks, Rachael Walker, Hendrik G Stunnenberg, Kathryn S Lilley, Jennifer Nichols, Wolf Reik, Paul Bertone, Austin Smith
Mouse embryonic stem (ES) cells are locked into self-renewal by shielding from inductive cues. Release from this ground state in minimal conditions offers a system for delineating developmental progression from naïve pluripotency. Here, we examine the initial transition process. The ES cell population behaves asynchronously. We therefore exploited a short-half-life Rex1::GFP reporter to isolate cells either side of exit from naïve status. Extinction of ES cell identity in single cells is acute. It occurs only after near-complete elimination of naïve pluripotency factors, but precedes appearance of lineage specification markers...
April 1, 2017: Development
G Cuce, H T Canbaz, M E Sozen, F H Yerlikaya, S Kalkan
Monocrotaline (MCT) is a hepatotoxic pyrrolizidine alkaloid that is derived from plants; exposure may occur by consumption of contaminated grains, herbal teas and medicines. MCT can cause liver damage. We investigated the antioxidant effects of selenium (Se) and vitamin E against the toxic effects of MCT. Female Wistar albino rats were divided into four groups: a control group, an MCT group, an MCT + Se group, and an MCT + vitamin E group. Liver tissues were harvested, fixed, processed to paraffin and sections were cut...
2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
E M Kendirlik, S Sirt, S B Kalkan, N Ofek, V Umansky, A Siddiki
Since the experimental realization of the integer quantum Hall effect in a two-dimensional electron system, the interrelation between the conductance quantization and the topological properties of the system has been investigated. Assuming that the two-dimensional electron system is described by a Bloch Hamiltonian, system is insulating in the bulk of sample throughout the quantum Hall plateau due to a magnetic field induced energy gap. Meanwhile, the system is conducting at the edges resembling a 2+1 dimensional topological insulator without time-reversal symmetry...
January 10, 2017: Nature Communications
Z M Y Kılıç, A S Köksal, I H Kalkan, N Suna, H Yıldız, S Kacar
BACKGROUND AND AIM: Currently there is no satisfactory treatment of chronic HDV. We aimed to evaluate the long term efficacy of PEG-interferones. PATIENTS METHODS: Patients who received PEG-interferone for chronic delta hepatitis during a 7-year period were retrospectively analysed. End of treatment response, virologic response at 6 months after treatment, and long term efficacy were evaluated. Predictors of treatment response were determined. RESULTS: The study group consisted of 31 patients...
July 2016: Acta Gastro-enterologica Belgica
Büşra Kaya, Belkis Atasever-Arslan, Zeynep Kalkan, Hazal Gür, Bahri Ülküseven
Thiosemicarbozone complexes that have a broad spectrum of biological activity are formed as a result of condensation reaction between thiosemicarbazide [H2N(C=S)-NH-NH2] and carbonyl-containing compounds. A new Nickel(II) complexes with N1-acetylacetone, N4-4-methoxy-salicylidene-thiosemicarbazidato ligand was synthesized and characterized. We studied the antileukemic activity of the Ni(II) thiosemicarbazone compound and assessed their potential for drug development. Specifically, the effects of this Ni(II) thiosemicarbazone compound on intracellular signal nodes and apoptotic pathways were investigated...
October 2016: General Physiology and Biophysics
Jörn Oliver Sass, Corinne Gemperle-Britschgi, Maja Tarailo-Graovac, Nisha Patel, Melanie Walter, Albena Jordanova, Majid Alfadhel, Ivo Barić, Mahmut Çoker, Aynur Damli-Huber, Eissa Ali Faqeih, Nuria García Segarra, Michael T Geraghty, Bjørn Magne Jåtun, Sema Kalkan Uçar, Merten Kriewitz, Markus Rauchenzauner, Karmen Bilić, Ivailo Tournev, Claudia Till, Bryan Sayson, Daniel Beumer, Cynthia Xin Ye, Lin-Hua Zhang, Hilary Vallance, Fowzan S Alkuraya, Clara D M van Karnebeek
Primary 5-oxoprolinuria (pyroglutamic aciduria) is caused by a genetic defect in the γ-glutamyl cycle, affecting either glutathione synthetase or 5-oxoprolinase. While several dozens of patients with glutathione synthetase deficiency have been reported, with hemolytic anemia representing the clinical key feature, 5-oxoprolinase deficiency due to OPLAH mutations is less frequent and so far has not attracted much attention. This has prompted us to investigate the clinical phenotype as well as the underlying genotype in patients from 14 families of various ethnic backgrounds who underwent diagnostic mutation analysis following the detection of 5-oxoprolinuria...
September 2016: Molecular Genetics and Metabolism
Aydın Şeref Köksal, Nuretdin Suna, İsmail Hakkı Kalkan, Ahmet Tarık Eminler, Şükran Ziyşan Sakaoğulları, Nesrin Turhan, Fatih Saygılı, Ufuk Barış Kuzu, Erkin Öztaş, Erkan Parlak
BACKGROUND/AIM: The clinical significance of gastric xanthelasmas is unknown. We conducted a case-control study in order to evaluate whether gastric xanthelasma is an indicator of advanced atrophic gastritis and intestinal metaplasia. MATERIAL AND METHOD: The study was conducted among 1400 patients who underwent elective upper endoscopy. Patients with gastric xanthelasma and atrophy and/or intestinal metaplasia constituted the study group (n = 55). The control group involved patients with only atrophic gastritis and/or intestinal metaplasia (n = 50)...
October 2016: Digestive Diseases and Sciences
A Erkut, M C Cure, Y Kalkan, M S Balik, Y Guvercin, E Yaprak, S Yuce, I Sehitoglu, E Cure
OBJECTIVE: Thymoquinone (TQ) is an antioxidant and anti-apoptotic substance found in the Nigella sativa plant. Alpha-tocopherol (α-TP) is a potent antioxidant. We aimed to determine whether or not TQ and TP have a protective effect against lower limb ischemia-reperfusion (IR) injury of muscle and the sciatic nerve. MATERIALS AND METHODS: A single dose of TQ 25 mg/kg was given intraperitoneally to the TQ group, a single dose of α-TP 200 mg/kg was given intraperitoneally to the α-TP group...
2016: European Review for Medical and Pharmacological Sciences
F Sapmaz, I H Kalkan, S Guliter
Ischaemic colitis results from a chronic or acute drop in the blood supply to the bowel and accounts for 6‒18% of the causes of acute lower gastrointestinal bleeding. Diabetes mellitus, hypotension, advanced age, aortic surgery and peripheral vascular disease have also been suggested to be predisposing factors for ischaemic colitis (1). In this report, we present a case of ischaemic colitis in haemodialysis with a good response to conservative treatment.
December 11, 2015: West Indian Medical Journal
Yusuf Özbel, Mehmet Karakuş, Suha K Arserim, Şaban Orçun Kalkan, Seray Töz
Human visceral leishmaniasis (VL) is reported from 38 provinces of Turkey and dogs are accepted as main reservoir hosts. Kuşadası town, belonging to Aydın province and located in western part of Turkey, is endemic for human and canine visceral leishmaniasis caused by Leishmania infantum MON1 and MON98. In this study, phlebotomine survey was conducted to determine the vector sand fly species and to identify sand fly blood meal sources. In August and September 2012, 1027 sand fly specimens were caught using CDC light traps...
March 2016: Acta Tropica
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