Preparation of Poly(vinyl alcohol)/Silk Sericin Blend Membranes with Solvent Casting Method For Effective Removal of Remazol Black B

Zehra Gün Gök 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

In the present work, poly(vinyl alcohol)/silk sericin (PVA/SS) membranes were obtained with an easily procedure and removal of remazol black B (RBB) by the membranes was investigated. To synthesize PVA/SS membranes by solvent casting method, 5% SS solution (g/mL) and 10% PVA solution (g/mL) were mixed one to one ratio by volume, the mixture was transferred to a petri dish and incubated at 25 ºC for 24 h. Then, the obtained membranes were incubated at 150 ºC for 1 h for physical crosslinking. The obtained membranes were characterized with fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and thermogravimetric analysis (TGA). Then, for adsorption experiments, firstly, RBB adsorption capabilities of PVA/SS membranes were tested at pH ranging from 2 to 7. After that, the removal experiments were carried out at different incubation time, initial dye concentration and PVA/SS membrane amount to optimize the conditions for removal of RBB with the PVA/SS membranes. The obtained membranes removed high amount of RBB when the solution pH was 2 and the adsorption of RBB to the membranes reached equilibrium within 10 h. The maximum RBB adsorption ability of the PVA/SS membranes was found to be 15.27 mg/g when the initial RBB amount of the solution was 200 mg/L. These results show that PVA/SS membranes, which can be easily synthesized for large applications, have the capacity to be used to remove negatively charged pollutants such as RBB from liquid solutions.

Leaf beetle (Coleoptera: Chrysomelidae) communities of Kovada Lake and Kızıldağ national parks (Isparta, Turkey): assessing the effects of habitat types

İsmail Şen,Ali GÖK 한국곤충학회 2014 Entomological Research Vol.44 No.5

Leaf beetle species composition, diversity and community structure were investigated and compared among three different habitat types (herbaceous open area, forest area without shrubs, forest area with shrubs) included in Kovada Lake (KL) and Kızıldağ (KD) national parks in Isparta province, at the Mediterranean region of Turkey. In total, 132 leaf beetle species (88 from KL and 96 from KD) belonging to ten subfamilies were collected. Spatial distribution of the leaf beetles and estimated species number were compared between study sites and some environmental factors affecting the determined species were analyzed. The highest leaf beetle diversity among the habitat types was in the forest areas with abundant shrubby understory at the KL with diversity values of 2.67 (Shannon–Wiener index) and 0.87 (Simpson index). The most similar habitats in terms of the leaf beetle communities were herbaceous open areas at both national parks with similarity values 50% (Sørensen index) and 34% (Jaccard index). Nonparametric estimators ICE, Chao2, Jackknife1 and Jackknife2 show that the percentages of the detected leaf beetle species during field surveys in the KL were between 85% and 93%, and in the KD were between 67% and 78%. Canonical correspondence analysis indicates that the most effective environmental variables on the leaf beetle species diversity were covers of the herbaceous and tree layers. Also, these results show that the most important environmental variable affecting the leaf beetle species diversity was floristic structure of the sites.

Endovascular Treatment of a Giant Aneurysm of the Aberrant Right Hepatic Artery in a Patient with Osler-Weber-Rendu Syndrome: A Case Report

Mehmet Burak Çildağ,Mustafa Gök,Tuğba Öztürk,Ömer Faruk Kutsi Köseoğlu 대한혈관외과학회 2023 Vascular Specialist International Vol.39 No.3

Osler-Weber-Rendu syndrome (OWR) is an autosomal dominant disorder characterized by recurrent epistaxis, mucocutaneous or visceral telangiectasias, and arteriovenous malformations in the lungs, liver, brain, and gastrointestinal tract. Hepatic artery aneurysms (HAAs) can also occur in OWR patients. HAAs are the second most common type of visceral artery aneurysm, and mortality rates are high owing to the lack of a tamponade effect. Anatomical variations of the celiacomesenteric vasculature are common, and the most common variation is that of the right hepatic artery originating from the superior mesenteric artery (SMA). We present the endovascular treatment of a patient with OWR and an aberrant right HAA originating from the SMA, with coil embolization and stent grafting. Giant HAAs can be treated endovascularly. However, stent graft placement should be reconsidered because of the need for antithrombotic medication, which may increase the incidence of epistaxis attacks in that patient group.

Comparision of Nd: YAG Capsulotomy Rate with Viscoimplantation and Hydroimplantation Intraocular Lens Techniqu

tevfik oğurel,Reyhan Oğurel,Nesrin Büyüktortop Gök,Zafer Onaran,Nurgül Örnek,Kemal Örnek 대한안과학회 2019 Korean Journal of Ophthalmology Vol.33 No.3

Purpose: To investigate the rate of neodymium-doped yttrium aluminum garnet (Nd:YAG) laser capsulotomy inthe hydroimplantation intraocular lens (IOL) technique. Methods: This retrospective study was comprised of 6,192 eyes in 3,790 patients who underwent surgery fromJanuary 2013 to September 2017 and then were followed up for at least 1 year. The eyes of these patientswere divided into two groups: either viscoimplantation or hydroimplantation. The follow-up examinations werecarried out on the 1st day, 4th day, 1st month, and 3 months to 1 year postoperatively. The Nd:YAG capsulotomyrates were evaluated by the different IOL implantation techniques and IOL materials. Results: The mean follow-up duration of the patients was in the viscoimplantation group 14.85 ± 2.43 and 15.05± 1.93 months in the hydroimplantation group. The Nd:YAG capsulotomy rate was significantly lower in thehydroimplantation group compared with the viscoimplantation group for the entire hydrophilic IOL model (p <0.001). In addition, the Nd:YAG rate was lower in the hydroimplantation group that used a hydrophilic IOL thanit was in the viscoimplantation group, which used a hydrophobic IOL. Conclusions: The hydroimplantation technique reduced the Nd:YAG capsulotomy rate.

Foramen Magnum Decompression and Duraplasty is Superior to Only Foramen Magnum Decompression in Chiari Malformation Type 1 Associated with Syringomyelia in Adults

Mehmet Sabri Gürbüz,Mehmet Zafer Berkman,Emre Ünal,Elif Akpınar,Şevki Gök,Metin Orakdöğen,Salih Aydın 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.5

Study Design: Retrospective cohort study. Purpose: To compare surgical results of foramen magnum decompression with and without duraplasty in Chiari malformation type 1 (CM-1) associated syringomyelia (SM). Overview of Literature: The optimal surgical treatment of CM-1 associated with SM is unclear. Methods: Twenty-five cases of CM-1 with SM were included. There were 12 patients (48%) in the non-duraplasty group and 13 patients (52%) in the duraplasty group. The rate of improvement, state of postoperative SM size, amount of tonsillar herniation, preoperative symptom duration, complications and reoperation rates were analysed. Results: The rate of clinical improvement was significantly higher with duraplasty (84.6%) than without (33.3%, p <0.05). The rate of postoperative syrinx regression was significantly higher in the duraplasty group (84.6%) than in the non-duraplasty group (33.3%, p <0.05). One case in the duraplasty group needed a reoperation compared with five cases in the non-duraplasty group (p =0.059). Conclusions: Duraplasty is superior to non-duraplasty in CM-1 associated with SM despite a slightly higher complication rate.

Highly Porous Biocomposite Scaffolds Fabricated by Chitosan/Alginate/Diatom for Tissue Engineering

Yusuf Özcan,Dicle Erden Gönenmiş,Esranur Kızılhan,Cem Gök 한국고분자학회 2022 폴리머 Vol.46 No.4

Tissue scaffolds based composite material have attracted great attention in the field of bone tissue engineering. Therefore, researchers are looking for new materials to be used for composite tissue scaffolding. We aimed to producethe effect of high porous and non-toxic scaffolds as hydrogels with two different contents using chitosan, alginate anddiatom. Beads were made from alginate and alginate/diatom hydrogels and additionally coated in dilute chitosan solution. Obtained alginate-chitosan (AC) and alginate/diatom-chitosan (ADC) beads were lyophilized. High-porous AC scaffoldand both high-porous and nano-porous ADC scaffold were examined in terms of density, porosity, swelling tests and morphologic, chemical, cytotoxic analysis. In this study, high porosity with approximately 450 μm pore size was found forAC and ADC scaffolds. The average pore size of diatom in ADC was acquired as 280 nm. Moreover, AC and ADC didnot show any cytotoxic effects on HEK293 cells. Our results clearly indicated that scaffolds have an alternative potentialin the field of tissue engineering