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Ozgur G, Sekerci C, Tanidir Y, Tarcan T, Yucel S. Predictive factors of full response to desmopressin treatment in children with primary monosymptomatic enuresis nocturna. Eur Urol 2023. [DOI: 10.1016/s0302-2838(23)00664-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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Komur B, Bayrak F, Ekren N, Eroglu MS, Oktar FN, Sinirlioglu ZA, Yucel S, Guler O, Gunduz O. Starch/PCL composite nanofibers by co-axial electrospinning technique for biomedical applications. Biomed Eng Online 2017; 16:40. [PMID: 28356126 PMCID: PMC5372289 DOI: 10.1186/s12938-017-0334-y] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 03/21/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In this study, starch and polycaprolactone (PCL), composite nanofibers were fabricated by co-axial needle electrospinning technique. Processing parameters such as polymer concentration, flow rate and voltage had a marked influence on the composite fiber diameter. Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), mechanical and physical properties (such as density, viscosity and electrical conductivity) of the composite fibres were evaluated. Moreover, a cell culture test was performed in order to determine their cytotoxicity for wound dressing application. RESULTS The effect of starch ratio in the solution on the properties and morphological structure of the fibers produced was presented. With lower starch concentration values, the fibers have greater ultimate tensile strength characteristic (mostly 4 and 5 wt%). According to SEM results, it can be figured out that the nanofibers fabricated have good spinnability and morphology. The mean diameter of the fibers is about 150 nm. According to results of cell culture study, the finding can be determined that the increase of starch in the fiber also increases the cell viability. CONCLUSIONS Composite nanofibers of starch/PCL have been prepared using a co-axial needle electrospinning technique. PCL was successfully encapsulated within starch. Fiber formation was observed for different ratio of starch. With several test, analysis and measurement performed, some important parameters such as quality and effectuality of each fiber obtained for wound dressing applications were discussed in detail.
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Affiliation(s)
- B Komur
- Kanuni Sultan Suleyman Training and Research Hospital, Turgut Ozal Street No.1, Halkalı, Kucukcekmece, 34303, Istanbul, Turkey
| | - F Bayrak
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey.,Department of Metallurgical and Materials Engineering, Institute of Pure and Applied Sciences, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey
| | - N Ekren
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey.,Department of Electrical and Electronics Engineering, Faculty of Technology, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey
| | - M S Eroglu
- Department of Chemical Engineering, Faculty of Engineering, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey
| | - F N Oktar
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey.,Department of Bioengineering, Faculty of Engineering, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey
| | | | - S Yucel
- Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering, Yıldız Technical University, Davutpasa Campus, 34220, Istanbul, Turkey
| | - O Guler
- Department of Orthopedics and Traumatology, Faculty of Medicine, Istanbul Medipol University, Halic Campus, 34083, Istanbul, Turkey
| | - O Gunduz
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey. .,Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Goztepe Campus, 34722, Istanbul, Turkey.
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Abstract
This study compared the analgesic efficacy of intrathecal (IT) morphine plus IV patient-controlled analgesia (PCA) morphine with IV PCA morphine alone in 33 patients undergoing thoracotomy randomized to two groups: the IT morphine group ( n = 17) received 10 μg/kg morphine 1 h before the end of surgery, while the control group ( n = 16) did not. All patients had access to an IV PCA pump post-operatively that delivered 2 mg morphine boluses. Post-operative pain and sedation scores, respiratory and haemodynamic parameters, and morphine demand and delivery were assessed up to 48 h. Post-operative pain scores and morphine consumption were significantly reduced, while peak expiratory flow rates were significantly increased in the IT morphine group compared with controls. We concluded that IT morphine in addition to IV PCA established superior analgesia and maintained better respiratory function compared with IV PCA alone in post-thoracotomy patients.
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Affiliation(s)
- F Z Askar
- Department of Anaesthesiology and Reanimation, Faculty of Medicine, Ege University, Izmir, Turkey
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Akin Y, Bassorgun I, Basara I, Yucel S. Malignant mesothelioma of tunica vaginalis: an extremely rare case presenting without risk factors. Singapore Med J 2016; 56:e53-5. [PMID: 25820862 DOI: 10.11622/smedj.2015053] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Testicular tumours have many different manifestations, including hydrocele formation. Herein, we present an extremely rare case of testicular mesothelioma presenting with left hydrocele, but without risk factors. Left radical inguinal orchidectomy was performed, and pathological examination revealed a malignant mesothelioma of the tunica vaginalis of the testis. No infiltration of the spermatic cord was evident, and upon advanced radiological evaluation, no sign of metastasis was detected. Follow-up was still ongoing in our urology outpatient clinic at the time of this report. Although hydrocele is a simple and common condition that is easy to diagnose, a detailed investigation should be performed. Thus, when encountering a patient with hydrocele, the clinician should evaluate the possibility of the presence of an underlying testicular/paratesticular tumour, including a rare one such as mesothelioma of the tunica vaginalis.
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Affiliation(s)
- Y Akin
- Department of Urology, Harran University School of Medicine, Sanliurfa 63100, Turkey.
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Akgun Z, Yucel S, Kilic U, Aysan E, Sahin F, Muslumanoglu M, Saglam E. Protective Effect of Boron-Based Gel on Radiation Induced Dermatitis in Rats. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Abstract
Pediatric glans penis malformations, especially arteriovenous malformations (AVM), are very rare. Herein, we report two rare cases. A 14-year-old boy attended our outpatient clinic with chief complaints of purple swelling and rapidly growing lesion on the glans penis. The lesion was excised surgically after physical and radiological evaluations. Pathology reported AVM and the patient is being followed up. The second case is a 2-year-old boy who was admitted with a big lesion involving glans penis and genital area that has been present since birth. In physical and radiological evaluations, lesion on the glans penis was pulsatile. Parents of the patient did not want any surgery and patient has been in follow-up. Diagnosis of the vascular lesions on glans penis is very easy by physical and radiological examinations today. Long-term follow-up is very important for AVM. Clinicians must make a careful effort to document new glans lesions in the pediatric population and decrease anxiety in the parents of affected children.
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Affiliation(s)
- Y Akin
- Department of Urology, Erzincan University, Erzincan, Turkey.
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Akın Y, Yuksel K, Bassorgun I, Ciftcioglu MA, Yucel S, Baykara M, Nuhoglu B, Bozkurt A, Erdogru T. The consistency of Gleason scores may effect the operation outcomes for laparoscopic radical prostatectomy: a single surgeon and a single pathologist data. Eur Rev Med Pharmacol Sci 2013; 17:123-129. [PMID: 23329533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
INTRODUCTION To evaluate the effects of consistency in preoperative and postoperative Gleason scores to the operation outcomes in patients who underwent laparoscopic radical prostatectomy. MATERIALS AND METHODS 204 of 347 patients were included the study. 143 patients whose preoperative prostate biopsies were evaluated in the other Institute were not included into the study. The preoperative data of patients and operation outcomes were investigated from institute's files of patients. Patients were divided to three groups by using consistence of pre and postoperative Gleason scores. The tumor, node and metastasis classification were used for staging prostate cancer. RESULTS Mean age was 63 and the mean PSA level was 11 ng/dl overall. In statistical analysis PSA levels, Gleason score and rate of positive score were significantly low in Group I (p < 0.05). As in operative data, nerve sparing surgical technique was performed statistical significance higher in Group 1 than other Groups. External bleeding rate of Group II was significantly lower than the other Groups. In univariate and multivariate analysis, postoperative pathologic stage was statistical significant for consistency of pre and postoperative Gleason scores. CONCLUSIONS The modified Gleason scoring system is safe and usable for evaluating prostate biopsies and operative specimens. The consistency in pre and postoperative Gleason score effect the operation technique and also operation outcomes. Working with an experienced uro-pathologist provides to inform patients more accurate and better.
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Affiliation(s)
- Y Akın
- Department of Urology, Erzincan University, Faculty of Medicine, Erzincan, Turkey.
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Almac Z, Fayda M, Asoglu O, Saglam S, Yucel S, Acun H, Saglam E, Kizir A, Camlıca H, Oral E. Early Results of Neoadjuvant Hyperfractionated Accelerated Radiotherapy (HART) with Concurrent and Postoperative Chemotherapy for Locally Advanced Rectal Cancer. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Yildiz O, Alp E, Yucel S, Kiran B, Tucer B, Ok E, Aygen B. R2267 Repeated prevalence surveys of surgical site infections in a Turkish university hospital. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)72106-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
OBJECTIVES To describe the effects of exogenous oestrogens and androgens on urethral formation in the mouse, as the development of the mouse and human urethra have significant similarities, and understanding normal male urethral development may help to identify the causes of abnormal development, e.g. hypospadias. MATERIALS AND METHODS Timed-pregnant C57/6 mice were exposed to synthetic oestrogens and androgens. The morphology of the genital tubercles was examined histologically and with three-dimensional computer reconstruction. Specific attention was focused on the developing urethral seam. RESULTS Microscopic serial analysis confirmed the presence of an arrest in seam formation in about half of oestrogen-treated male fetuses. In contrast, there was acceleration of urethral fold fusion and a longer urethral tube in those treated with androgens. Oestrogen-treated fetuses had a thin periurethral spongiosa, in contrast to androgen-treated fetuses which developed a thicker periurethral spongiosa. The effect of oestrogens on seam area formation did not depend on the dose, but in contrast, in the androgen-treated fetuses it was. CONCLUSION Oestrogens and androgens have a direct effect on the fusion of the urethral fold that leads to seam formation. Normal urethral development depends on the delicate balance of these complementary hormones.
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Affiliation(s)
- S Yucel
- UCSF Children's Medical Center, Departments of Urology and Paediatrics, University of California, San Francisco, USA
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Abstract
OBJECTIVE To describe the topography of the perineal nerves from their pudendal origin to their course into the male genitalia, with specific attention on the course of the perineal nerve along the ventral penis, including branches into bulbospongiosus muscle and corpus spongiosum. MATERIALS AND METHODS The study comprised 18 normal human fetal penile specimens at 17.5-38 weeks of gestation (determined by fetal heel-to-toe length). Specimens were fixed in formalin, embedded in paraffin wax and serially sectioned at 6 micro m. The penile specimens contained the whole penis from the glans to the crural bodies, beneath the pubic arch and the perineum up to the anal verge. Immunocytochemistry was assessed on selected sections with antibodies against the neuronal markers S-100 and nitric oxide synthase (nNOS). Three-dimensional computer reconstruction of serial sections allowed an in-depth analysis of the neuroanatomy of the fetal penis, perineum and surrounding structures. RESULTS After the pudendal nerve leaves the pudendal canal it gives rise to the perineal nerve branches in the ischiorectal fossa. Perineal nerves travel alongside the ischiocavernous and bulbospongiosus muscles and before reaching the latter, nerve branches course into the bulbospongiosus muscle. During its pathway within this muscle, fine nerve fibres course into the corpus spongiosum by piercing through the junction of the muscle. At the penoscrotal area, the perineal nerves give branches to the scrotum, funnelling into the interscrotal septum. Perineal nerves continue their pathway over the ventral side of penis covering the ventral surface of corpus spongiosum. Branches of the dorsal nerve of the penis at the junction of corpus cavernosum and corpus spongiosum assemble into a network with the perineal nerves. All perineal nerves from their main trunk at the ischiorectal fossa until their interaction with dorsal nerve of penis at the base of penis were nNOS negative. After the interaction with the dorsal nerve of penis, they become nNOS positive. CONCLUSION Integrating neuroanatomical knowledge about the perineal nerves and their communication with the dorsal nerve of penis should facilitate a strategic approach to reconstructive procedures on the penis. Special care should be taken at the junction between the corpora cavernosa and spongiosa, where the dorsal nerve joins the perineal nerve, and at the proximal bulbospongiosus muscle, thereby protecting the fine nerves piercing into the cavernosa spongiosa.
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Affiliation(s)
- S Yucel
- Department of Urology and Paediatrics, UCSF Children's Medical Center, University of California San Francisco, USA
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Abstract
OBJECTIVE To define the scrotal nerve origin and distribution with respect to surrounding structures in male human fetuses, by using neuronal-specific markers and three-dimensional (3D) imaging techniques, as the developmental neuroanatomy of the human scrotum has not been studied in detail and an explicit description of nerve derivation and distribution in the human scrotum is germane to genital reconstructive surgery. MATERIALS AND METHODS Sixteen normal human fetal penile specimens at 17.5-38 weeks of gestation were studied. Specimens were fixed in formalin, embedded in paraffin wax, serially sectioned at 6 micro m and stained with the neuronal marker S-100. All of the specimens contained the whole penis and scrotum from glans to anal verge. The gestational age of the fetuses was determined by fetal heel-to-toe length. 3D-computer reconstruction of serial sections allowed a detailed analysis of the neuroanatomy of the fetal penis and scrotum. RESULTS The nerves innervating the ventral side of the proximal penis and scrotum originated mainly from the perineal nerves arising from pudendal nerves. The nerves travelling along the ventral side of penis coalesced at the penoscrotal area to be directed into the interscrotal septum. At the penoscrotal junction, nerves on both sides of the ventral penis shifted to the interscrotal septum in a triangular fashion. The interscrotal septum was densely occupied by nerve fibres. Nerves were distributed horizontally to both hemiscrotal walls through this interscrotal septum. Both hemiscrota seem primarily to be innervated separately. CONCLUSION The interscrotal septum has a dense innervation. Both hemiscrota were innervated mainly by horizontally distributed nerve fibres arising from the interscrotal septum. Any procedure violating the penoscrotal and interscrotal septal area may jeopardize scrotal innervation.
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Affiliation(s)
- S Yucel
- Department of Urology and Pediatrics, UCSF Children's Medical Center, University of California San Francisco, CA, USA
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Vogl TJ, Hoffmann Y, Juergens M, Weinmann HJ, Mühler A, Yucel S, Felix R. [Experimental evaluation of contrast medium enhanced high resolution MR angiography in the animal model. Gd-DTPA compared with Gd-DTPA-polylysine]. Radiologe 1996; 36:254-62. [PMID: 8693090 DOI: 10.1007/s001170050069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
PURPOSE To evaluate the qualitative and quantitative efficacy of Gd-DTPA and Gd-DTPA polylysine for contrast-enhanced high resolution MRA (CMRA) of the abdominal vessels. MATERIALS AND METHODS In ten anesthesized rabbits (average weight 4.3 kg) MR angiography was performed using a 1.5 T MR unit (Magnetom SP 63; Siemens Erlangen) and a CP head coil. Arterial MRA (FISP 3D TONE, TR/TE = 33/8, Flip 20 degrees) and venous MRA (FLASH 2D, TR/TE = 37/10, Flip 60 degrees) was performed before and after administration of the paramagnetic contrast agents Gd-DTPA (n = 5) or Gd-DTPA polylysine (n = 5) at a dosage of 0.1 mmol/kg. In all studies the single sections and the MIP reconstructions were evaluated quantitatively by measuring and calculating signal intensity, percentage enhancement, signal-to-noise and contrast-to-noise ratios. All studies were assessed qualitatively for visualization and distinction of the arterial and venous vessel system by three independent observers before and after the administration of contrast agent. RESULTS Gd-DTPA-enhanced arterial FISP 3D tone led to a percentage enhancement of 30% for the kidneys, 12% for the superior mesenteric artery, 18% for the deep circumfluent iliac artery, and 7% for the internal iliac artery. In FLASH 2D sequences Gd-DTPA led to a good C/N only for venous abdominal vessels like the left renal vein (2.59) and internal iliac vein (1.66); the percentage enhancement of these structures was between 16 and 21%. Qualitative comparison also showed no significant improvement after injection of Gd-DTPA. In FISP 3D TONE sequences Gd-DTPA polylysine led to a strong percentage enhancement of right and left kidney (21 and 40%) and deep circumfluent iliac artery (17%). Qualitative evaluation showed improved delineation and contrast of low-diameter vessels, while the soft tissue was only slightly enhanced and did not impair vessel visualization. CONCLUSION CMRA using Gd-DTPA and Gd-DTPA polylysine significantly improved the delineation of abdominal vessels, with Gd-DTPA polylysine being superior.
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Affiliation(s)
- T J Vogl
- Strahlenklinik und Poliklinik, Universitätsklinikum Rudolf Virchow, Freie Universität Berlin
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Yucel S, Alexander N, Honig A. Low-temperature catalysis of para-deuterium to ortho-deuterium conversion on Grafoil. Phys Rev B Condens Matter 1990; 42:820-825. [PMID: 9994605 DOI: 10.1103/physrevb.42.820] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yucel S. Theory of ortho-para conversion in hydrogen adsorbed on metal and paramagnetic surfaces at low temperatures. Phys Rev B 1989; 39:3104-3115. [PMID: 9948607 DOI: 10.1103/physrevb.39.3104] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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