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Optimization of tetracycline removal with chitosan obtained from mussel shells using RSM
Murat Topal,E. Işıl Arslan Topal 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
In this study, the removal of tetracycline from aqueous solutions with chitosan obtained from musselshells was optimized and investigated using responce surface methodology. For this aim, the centralcomposite design was used to optimize the four variable factors (sorbent dosage (0.4–1.0 g), time(20 60 min), temparature (10 30 C) and initial TC concentration (50 100 mg/L)) for the removal of TCfrom aqueous solutions by chitosan obtained from mussel shells. According to the RSM analysis results,optimum conditions for maximum TC removal efficiency were determined as 90.5 mg/L for initial TCconcentration, 35.9 min for time, 29.9 C for temperature and 0.4 g for sorbent dosage. It was observedthat the tetracycline was crystallized on mussel shells. According to the results of XRD after adsorption,the content of mussel shells were observed as 60% calcite, 5.6% overite, 9.4% aragonite and calciumhydroxide 25%, respectively. As a result, experiments showed that chitosan obtained from mussel shellswere a good adsorbant for tetracycline removal from aqueous solutions.
Hayri Ogul,Leyla Karaca,Cahit Emre Can,Berhan Pirimoglu,Kutsi Tuncer,Murat Topal,Aylin Okur,Mecit Kantarci 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.4
The purpose of this review was to demonstrate magnetic resonance (MR) arthrography findings of anatomy, variants, and pathologic conditions of the superior glenohumeral ligament (SGHL). This review also demonstrates the applicability of a new MR arthrography sequence in the anterosuperior portion of the glenohumeral joint. The SGHL is a very important anatomical structure in the rotator interval that is responsible for stabilizing the long head of the biceps tendon. Therefore, a torn SGHL can result in pain and instability. Observation of the SGHL is difficult when using conventional MR imaging, because the ligament may be poorly visualized. Shoulder MR arthrography is the most accurately established imaging technique for identifying pathologies of the SGHL and associated structures. The use of three dimensional (3D) volumetric interpolated breath-hold examination (VIBE) sequences produces thinner image slices and enables a higher in-plane resolution than conventional MR arthrography sequences. Therefore, shoulder MR arthrography using 3D VIBE sequences may contribute to evaluating of the smaller intraarticular structures such as the SGHL.