Cytoplasmic Effects on the Tissue Culture Response of Winter Durum Wheat (Triticum durum Desf.) Callus

Murat?zgen,NurArpacio?lu 한국유전학회 2003 Genes & Genomics Vol.25 No.1

The dye adsorption and antibacterial properties of composite polyacrylamide cryogels modified with ZnO

Murat Inal,Nuran Erduran,Murat Gökgöz 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-

The present study aimed to modify the surface of polyacrylamide cryogels (PAC) with ZnO nanorods(ZNR) to provide them with antibacterial properties. The synthesized ZNR-modified composite PAC(ZMC) characterized by AAS, FTIR, SEM, XRD, XPS, BET surface analysis and TGA studies. A study of theadsorption of Orange G (OG) and antibacterial effect was performed on the synthesized ZMC. The highestadsorption capacity was determined to be at a dye concentration of 142.79 mg/g at 400 ppm, and a pH of2. From the data obtained, it was found that adsorptionfitted the pseudo-second-order kinetic model andFreundlich isotherm. Modified cryogels could be desorbed in a very short time – such as 30 min – andreused approximately twenty times with 80% efficiency. While ZMC cryogels did not show antibacterialactivity in the dark, inhibition percentages were determined as 99.79 3.94% and 99.811.76%, at1.78 mg/mL cryogel application, MIC90 values were determined as 1.589 0.063 and 0.660 0.028 mg/mL for Escherichia coli, and Staphylococcus aureus, respectively under visible light. The results showed thatthe composite cryogels obtained had a very high potential to be applied both in the removal of dyes fromwastewater and in the purification of microorganism-contaminated water.

Management of Sacral Tumors Requiring Spino-Pelvic Reconstruction with Different Histopathologic Diagnosis: Evaluation with Four Cases

Murat Arıkan,Guray Togral,Askin Esen Hasturk,Fevzi Kekec,Murat Parpucu,Safak Gungor 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.6

In this retrospective study, surgical results of four patients with sacral tumors having disparate pathologic diagnoses, who were treated with partial or total sacrectomy and lumbopelvic stabilization were abstracted. Two patients were treated with partial sacral resection and two patients were treated with total sacrectomy and spinopelvic fixation. Fixation methods included spinopelvic fixation with rods and screws in two cases, reconstruction plate in one case, and fresh frozen allografts in two cases. Fibular allografts used for reconstruction accelerated bony union and enhanced the stability in two cases. Addition of polymethyl methacrylate in the cavity in the case of a giant cell tumor had a positive stabilizing effect on fixation. As a result, we can conclude that mechanical instability after sacral resection can be stabilized securely with lumbopelvic fixation and polymethyl methacrylate application or addition of fresh frozen allografts between the rods can augment the stability of the reconstruction.

The contact problem of the functionally graded layer resting on rigid foundation pressed via rigid punch

Murat Yaylacı,Merve Abanoz,Ecren Uzun Yaylacı,Hasan Ölmez,Dursun Murat Sekban,Ahmet Birinci 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.5

The solution of contact problems is extremely important as we encounter many situations involving such problems in our daily lives. One of the most important parameters effective in solving contact problems is the materials of the parts in contact. While it is relatively easy to solve the contact mechanics of the systems created with traditional materials with a homogeneous microstructure and mechanical distribution, it may be more difficult to solve the contact problem of new generation materials that do not show a homogeneous distribution. As a result of this situation, it is seen that studies on contact problems of materials that do not exhibit such a homogeneous internal structure and mechanical properties are extremely limited in the literature. In this context, in this study, analytical and numerical analyzes of a contact problem created using functionally graded materials were carried out and the results were evaluated mutually. It has been decided that the contact areas and contact pressures acquired from numerical method are reasonably appropriate with the results obtained from the analytical method.

The Healing Effects of Autologous Mucosal Grafts in Experimentally Injured Rabbit Maxillary Sinuses

Murat Topdag,Ahmet Kara,Esma Konuk,Necdet Demir,Murat Ozturk,Sebla Calıskan,Deniz Ozlem Topdag,Arif Ulubil,Ibrahim Gurkan Keskin,Mete Iseri 대한이비인후과학회 2016 Clinical and Experimental Otorhinolaryngology Vol.9 No.1

Objectives. Healing processes of the nose and paranasal sinuses are quite complex, and poorly understood. In this study, we aimed to compare the effect of mucosal autologous grafts on the degenerated rabbit maxillary sinus mucosa with spontaneous wound healing. It is hypothesized that mucosal grafts will enhance ciliogenesis and improve the morphology of regenerated cilia. Methods. Ten female New Zealand rabbits were included in the study. They underwent external maxillary sinus surgery through a transcutaneous approach. A total of 20 maxillary sinuses were randomly divided into 2 groups: ‘spontaneous healing group’ and ‘autologous graft group.’ The animals were sacrificed at the 14th day after the surgery. Scanning electron microscope (SEM), and light microscope were used for the evaluation. Results. Cellular composition of the graft group is better than the spontaneous healing group. The graft group had larger areas covered with ciliary epithelium than the spontaneous healing group, and the mean length of the cilias were also longer. Additionally, there were wider cilia with abnormal morphology areas in the spontaneous healing group. Conclusion. In our opinion, covering of the denuded areas with a graft improves re-epithelization, and may prevent the early complications after sinus surgeries.

Antithrombotic effect of epigallocatechin gallate on the patency of arterial microvascular anastomoses

Murat İğde,Mehmet Onur Öztürk,Burak Yaşar,Mehmet Hakan Bulam,Hasan Murat Ergani,Ramazan Erkin Ünlü 대한성형외과학회 2019 Archives of Plastic Surgery Vol.46 No.3

Background Microvascular anastomosis patency is adversely affected by local and systemic factors. Impaired intimal recovery and endothelial mechanisms promoting thrombus formation at the anastomotic site are common etiological factors of reduced anastomosis patency. Epigallocatechin gallate (EGCG) is a catechin derivative belonging to the flavonoid subgroup and is present in green tea (Camellia sinensis). This study investigated the effects of EGCG on the structure of vessel tips used in microvascular anastomoses and evaluated its effects on thrombus formation at an anastomotic site. Methods Thirty-six adult male Wistar albino rats were used in the study. The right femoral artery was cut and reanastomosed. The rats were divided into two groups (18 per group) and were systemically administered either EGCG or saline. Each group were then subdivided into three groups, each with six rats. Axial histological sections were taken from segments 1 cm proximal and 1 cm distal to the microvascular anastomosis site on days 5, 10, and 14. Results Thrombus formation was significantly different between the EGCG and control groups on day 5 (P=0.015) but not on days 10 or 14. The mean luminal diameter was significantly greater in the EGCG group on days 5 (P=0.002), 10 (P=0.026), and 14 (P=0.002). Intimal thickening was significantly higher on days 5 (P=0.041) and 10 (P=0.02). Conclusions EGCG showed vasodilatory effects and led to reduced early thrombus formation after microvascular repair. Similar studies on venous anastomoses and random or axial pedunculated skin flaps would also contribute valuable findings relevant to this topic.

Antithrombotic effect of epigallocatechin gallate on the patency of arterial microvascular anastomoses

Igde, Murat,Ozturk, Mehmet Onur,Yasar, Burak,Bulam, Mehmet Hakan,Ergani, Hasan Murat,Unlu, Ramazan Erkin Korean Society of Plastic and Reconstructive Surge 2019 Archives of Plastic Surgery Vol.46 No.3

Background Microvascular anastomosis patency is adversely affected by local and systemic factors. Impaired intimal recovery and endothelial mechanisms promoting thrombus formation at the anastomotic site are common etiological factors of reduced anastomosis patency. Epigallocatechin gallate (EGCG) is a catechin derivative belonging to the flavonoid subgroup and is present in green tea (Camellia sinensis). This study investigated the effects of EGCG on the structure of vessel tips used in microvascular anastomoses and evaluated its effects on thrombus formation at an anastomotic site. Methods Thirty-six adult male Wistar albino rats were used in the study. The right femoral artery was cut and reanastomosed. The rats were divided into two groups (18 per group) and were systemically administered either EGCG or saline. Each group were then subdivided into three groups, each with six rats. Axial histological sections were taken from segments 1 cm proximal and 1 cm distal to the microvascular anastomosis site on days 5, 10, and 14. Results Thrombus formation was significantly different between the EGCG and control groups on day 5 (P=0.015) but not on days 10 or 14. The mean luminal diameter was significantly greater in the EGCG group on days 5 (P=0.002), 10 (P=0.026), and 14 (P=0.002). Intimal thickening was significantly higher on days 5 (P=0.041) and 10 (P=0.02). Conclusions EGCG showed vasodilatory effects and led to reduced early thrombus formation after microvascular repair. Similar studies on venous anastomoses and random or axial pedunculated skin flaps would also contribute valuable findings relevant to this topic.

Remote Cerebellar Hemorrhage Presenting with Cerebellar Mutism after Spinal Surgery : An Unusual Case Report

Sen, Halil Murat,Guven, Mustafa,Aras, Adem Bozkurt,Cosar, Murat The Korean Neurosurgical Society 2017 Journal of Korean neurosurgical society Vol.60 No.3

Dural injury during spinal surgery can subsequently give rise to a remote cerebellar hemorrhage (RCH). Although the incidence of such injury is low, the resulting hemorrhage can be life threatening. The mechanism underlying the formation of the hemorrhage is not known, but it is mostly thought to develop after venous infarction. Cerebellar mutism (CM) is a frequent complication of posterior fossa operations in children, but it is rarely seen in adults. The development of CM after an RCH has not been described. We describe the case of a 65-year old female who lost cerebrospinal fluid after inadvertent opening of the dura during surgery. Computerized tomography performed when the patient became unable to speak revealed a bilateral cerebellar hemorrhage.

Axisymmetric large deflection analysis of fully and partially loaded shallow spherical shells

Murat Altekin,Receb F. Yükseler 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.4

Geometrically non-linear axisymmetric bending of a shallow spherical shell with a clamped or a simply supported edge under axisymmetric load was investigated numerically. The partial load was introduced by the Heaviside step function, and the solution was obtained by the finite difference and the Newton-Raphson methods. The thickness of the shell was considered to be uniform and the material was assumed to be homogeneous and isotropic. Sensitivity analysis was made for three geometrical parameters. The accuracy of the algorithm was checked by comparing the central deflection, the radial membrane stress at the edge, or the transverse shear force with the solutions of plates and shells in the literature and good agreement was obtained. The main findings of the study can be outlined as follows: (i) If the shell is fully loaded the central deflection of a clamped shell is larger than that of a simply supported shell provided that the shell is not very shallow, (ii) if the shell is partially loaded the central deflection of the shell is sensitive to the parameters of thickness, depth, and partial loading but the influence of the boundary conditions is negligible.

Adobe Buildings Damaged during Kovanc lar (Elaz ) Earthquake on March 8, 2010 and their Earthquake Resistances

Murat Sunkar,H. Süha Aksoy 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.4

This study is intended to determine the resistance and strength of adobe samples taken from buildings damaged and collapsed during an earthquake that hit the east of Kovanc lar district (Elaz province) on March 8, 2010. This earthquake, which struck 30-35 km east of Kovanc lar district, with a magnitude of 6.0, affected more than 30.000 people and resulted in 42 deaths. The greatest damage and destruction caused by this earthquake were to stone, adobe and stone-adobe buildings. The compressive strength, granulometry, soil class and straw rate of samples taken from severely damaged Bayramyaz , Okçular, Tabanözü and Yaln zçam villages were determined in order to find out the earthquake resistance of adobe buildings. As a result of analyses, samples with low rate of clay and straw were revealed to be low strength, whereas those with high rate of such materials were shown to be high strength. Consequently, it was seen that the earthquake resistance of adobe buildings depends on the characteristics of construction material.