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Meltem Asiltürk,S¸ adiye S¸ ener,Engin S¸ener 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.2
TiO2 -coated activated carbon (TiO2 /AC) catalysts with high activity and easy separation were prepared by the coating method and their photocatalytic performances were studied for degradation of rhodamine B (RhB) dye. For this purpose, first, anatase TiO2 nanocrystal was prepared via sol–gel process of titanium(IV) isopropoxide (TTIP), followed by reflux treatment at a relatively low temperature (130 °C) without further treatments. Second, four different amounts of AC were separately coated with TiO2 by dipping in TiO2 sol (10%, w/w) at room temperature. The catalysts were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area, and UV–vis diffuse reflectance spectroscopy (DRS). Coating AC with TiO2 produced catalysts with higher BET surface areas and greater crystallite sizes as compared to bare TiO2 . RhB (50 mg/L) was almost completely discolored in 50 min, and the mineralization efficiency was 100% in 60 min for the catalysts containing 10 and 15% AC. Furthermore, all catalysts showed much higher photocatalytic activities than the commercial Degussa P-25.
Primary Mature Cystıc Teratoma Mimickıng an Adrenal Mass in an Adult Male Patient
Emrah Okulu,Kemal Ener,Mustafa Aldemir,Evren Isik,Cigdem Irkkan,Onder Kayigil 대한비뇨의학회 2014 Investigative and Clinical Urology Vol.55 No.2
Teratomas are bizarre neoplasms derived from embryonic tissues that are typicallyfound only in the gonadal and sacrococcygeal regions of adults. Primary retroperitonealteratomas are rare and present challenging management options. We report a case ofa unilateral primary retroperitoneal mature cystic teratoma mimicking an adrenalmass in a 54-year-old male patient. Complete resection of the adrenal mass was performedby the flank approach by using the 11th rib resection. Because of the risk of malignancy,follow-up radiographic studies were performed to ensure the oncologic efficacyof resection. The patient has been free of recurrence for longer than 12 months.
( Yildiz Okuturlar ),( Fahir Ozkalemkas ),( Beyza Ener ),( Sibel Ocak Serin ),( Esra Kazak ),( Tulay Ozcelik ),( Vildan Ozkocaman ),( Atilla Ozkan ),( Halis Akalin ),( Meral Gunaldi ),( Ridvan Ali ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Invasive aspergillosis (IA)) is a serious cause of morbidity and mortality in immunocompromised patients with haematologic malignancy. The serum galactomannan enzyme immunoassay (GM-EIA; Platelia Aspergillus EIA; Bio-Rad) was cleared by the Food and Drug Administration at an optical density index cut-off of 0.5 for a probable diagnosis of invasive aspergillosis. In this prospective study GM-EIA (Platelia Aspergillus EIA, Bio-Rad) with 0.5cut-off value and sequential sensitivity-specificity for single, consecutive two and consecutive three positivity were investigated for the diagnosis of IA in neutropenic hematologic patients. Methods: Serum samples were taken twice a week from patients during their hospitalization. IA was classified according to European Organisation for Research and Treatment of Cancer and Mycoses Study Group Guidelines as “proven”, “probable”, and “possible”. The sensitivity was calculated from the results of patients with proven/propable and the specificity was calculated from the results of patients non-IPA patients. Results: In 165 consecutive febrile episodes in 106 patients, 80 (48.5%) episodes were defined with IA (4 proven, 11 probable, 65 possible) and 85 (51.5%) episodes were defined as non-IA. Per episode average 8.3 serum samples were examined for a total of 1385 serum samples. Cut-off value of single GM-EIA = 0.5 for proven/probable IA with sensitivity/specificity 100%/ 27%, two consecutive positive GM-EIA = 0.5 with sensitivity/specificity 86%/ 71% and three consecutive positive GM-EIA = 0.5 with sensitivity/specificity 73%/85% were obtained. Conclusions: Measuring the level of galactomannan twice a week and consecutive monitoring reduced the sensitivity and increased the specificity. Monitoring of the GM-EIA frequently from the first positivity can increase sensitivity/specificity.
Serum galactomannan levels in the diagnosis of invasive aspergillosis
( Yildiz Okuturlar ),( Fahir Ozkalemkas ),( Beyza Ener ),( Sibel Ocak Serin ),( Esra Kazak ),( Tulay Ozcelik ),( Vildan Ozkocaman ),( Hasan Atilla Ozkan ),( Halis Akalin ),( Meral Gunaldi ),( Ridvan A 대한내과학회 2015 The Korean Journal of Internal Medicine Vol.30 No.6
Background/Aims: In this study, the sensitivity-specificity of galactomannan-enzyme immunoassay (GM-EIA) with a cut-off value of 0.5 for a single, two, or three consecutive positivity in the diagnosis of invasive pulmonary aspergillosis (IPA) in neutropenic patients with hematological malignancy was investigated. Methods: IPA was classified as “proven,” “probable,” or “possible” as described in the guidelines prepared by the European Organization for Research and Treatment of Cancer and Mycoses Study Group.” Serum samples were collected from the patients twice a week throughout their hospitalization. A total of 1,385 serum samples, with an average of 8.3 samples per episode, were examined. Results: Based on the 165 febrile episodes in 106 patients, 80 (48.5%) were classified as IPA (4 proven, 11 probable, 65 possible) and 85 (51.5%) as non-IPA. The sensitivity/ specificity was 100%/27.1% for a single proven/probable IPA with the cut of value of GM-EIA ≥ 0.5, 86.7%/71.8% for two consecutive positive results, and 73.3%/85.9% for three consecutive positive results. Conclusions: With the galactomannan levels measured twice a week, consecutive sensitivity decreased and specificity increased. Therefore, an increase may be obtained in sensitivity-specificity by more frequent monitoring of GM-EIA starting from the first day of positivity is detected.
Öznur Özalp,Hüseyin Alican Tezerişener,Burak Kocabalkan,Ulviye Şebnem Büyükkaplan,Mehmet Mustafa Özarslan,Göksel Şimşek Kaya,Mehmet Ali Altay,Alper Sindel 대한영상치의학회 2018 Imaging Science in Dentistry Vol.48 No.4
Purpose: The aim of this study was to evaluate the correlations between measurements made using panoramic radiography and cone-beam computed tomography (CBCT) based on certain anatomical landmarks of the jaws, with the goal of preventing complications due to inaccurate measurements in the pre-surgical planning phase of dental implant placement. Materials and Methods: A total of 56 individuals who underwent panoramic radiography and a CBCT evaluation before dental implant surgery were enrolled in the study. Measurements were performed to identify the shortest vertical distance between the alveolar crest and neighboring anatomical structures, including the maxillary sinus, nasal floor, mandibular canal, and foramen mentale. The differences between the measurements on panoramic radiography and CBCT images were statistically analyzed. Results: Statistically significant differences were observed between the measurements on panoramic radiography and CBCT for all anatomical structures (P<.05). The correlation coefficients (r) between the paired samples obtained from panoramic radiography and CBCT were closely correlated (P<.05), with r values varying from 0.921 and 0.979 for different anatomical regions. Conclusion: The results of this study support the idea that panoramic radiography might provide sufficient information on bone height for preoperative implant planning in routine cases or when CBCT is unavailable. However, an additional CBCT evaluation might be helpful in cases where a safety margin cannot be respected due to insufficient bone height.
( Ali Pekcan Demiröz ),( Reyhan Öztürk ),( Şener Barut ),( Salih Cesur ),( Semanur Ayyıldız ),( Vildan Fidancı ),( Osman Demir ),( Ferdi Güneş ),( Laser Şanal ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Chronic hepatitis B (CHB) and C (CHC) are leading causes of liver cirrhosis and hepatocellular cancer. Defining of inflammatory activity and severity of disease is important for commencing antiviral treatment and monitoring the patient. Currently noninvasive serological markers to define disease activity are of great interest. In this study we aimed to determine soluble urokinase plasminogen activator receptor (suPAR) levels of patients with CHB and CHC, compare its levels with those of controls and to find if suPAR levels correlated with some laboratory parameters, histologic activity index (HAI) and fibrosis stage. Methods: Twenty-eight patients with CHB, 11 patients with CHC and 41 healthy subjects, eighty subjects in total, were included in the study. suPAR levels of all subjects were determined using commercial ELISA kits according to manufacturer’s instructions. Correlation between suPAR levels and parameters including AST, ALT, leukocyte count, thrombocyte count and liver histology scores were statistically analyzed. Results: Fifty percent of CHB patients were on oral antiviral treatment. Serum suPAR levels of both CHB and CHC patients were higher than controls (p< 0,001). Age, suPAR, HAI, AST, ALT, leukocyte and thrombocyte counts of subjects in different groups (CHB, CHC patients and controls) were shown in table 1. When we divided patients into two groups according to HBV DNA, suPAR levels were not different between patients with HBV DNA >1000 IU/ml and those with HBV DNA<1000 IU/ml. suPAR levels were not found to be correlated with AST, ALT levels, thrombocyte and leukocyte counts or histologic findings. Conclusions: In both CHB and CHC patients, suPAR levels were determined to be higher than healthy controls although suPAR was not found to be correlated with diseae activity or severity related parameters. However new wide scale studies are needed to investigate the relation between suPAR and disease activity or fibrosis stage.
Ayşegül Güleryüz,Cumhur Korkmaz,Ayşe Şener,Mehmet Ozan Taş 대한치과보철학회 2021 The Journal of Advanced Prosthodontics Vol.13 No.5
PURPOSE. Esthetic expectations have increased the use of polyetheretherketone (PEEK) clasps as alternatives to Cr-Co in removable partial dentures (RPDs). The objective of this study was to evaluate the retentive force and dimensional change of clasps with different thickness and undercut made from PEEK by the thermo-mechanical fatigue. MATERIALS AND METHODS. PEEK clasps (N = 48) with thicknesses of 1 or 1.50 mm and 48 premolar monolithic zirconia crowns with undercuts of 0.25 mm or 0.50 mm were fabricated. Samples are divided into four groups (C1-C4) and were subjected to 7200 thermal aging cycles (at 5 – 55°C). The changes in the retentive force and dimensions of the clasps were measured by micro-stress testing and micro-CT devices from five measurement points (M1 - M5). One-way ANOVA, paired t-test, two-way repeated ANOVA, and post-hoc tests were used to analyze the data (P < .05). RESULTS. The retentive forces of C1, C2, C3, and C4 groups in initial and final test were found to be 4.389-3.388 N, 4.67 - 3.396 N, 5.161 - 4.096 N, 5.459 - 4.141 N, respectively. The effects of retentive force of all PEEK clasps groups were significant decreased. Thermo-mechanical cycles caused significant dimensional changes at points with M2, M4, and M5, and abraded the clasp corners and increased the distance between the ends of the clasp, resulting in reduced retentive forces (P * = .016, P * = .042, P < .001, respectively). CONCLUSION. Thermo-mechanical aging decreases the retentive forces in PEEK clasps. Increasing the thickness and undercut amount of clasps decreases the amount of dimensional change. The values measured after aging are within the clinically acceptable limits.