Browsing by Author "Baran T."

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Comparison of low-profile plate-screw and Kirschner-wire osteosynthesis outcomes in extra-articular unstable proximal phalangeal fractures
(2019-04-09) Köse A.; Topal M.; Engin M.Ç.; Şencan A.; Dinçer R.; Baran T.
Background: We aimed to present the radiological and clinical results of Kirschner-wire (K-wire) fixation and low-profile plate-screw fixation applied to unstable proximal phalangeal fractures without extension to the joint. Methods: Clinical and radiological data of 22 patients who underwent fixation with open reduction and low-profile 1.5-mm titanium mini plate and unlocked screws and 18 patients who underwent fixation with K-wire due to closed, unstable extra-articular proximal phalangeal fractures were retrospectively examined. All evaluation and statistical analyses were based on sixth postoperative month evaluation parameters. Active and passive metacarpophalangeal joint and interphalangeal joint range of motions, total joint range of motion, measurement of grip strength for fractured and healthy hands, visual analog scoring, disabilities of the arm, shoulder, and hand scores, measurement of distance between the pulpa and palmar curve in the operated finger, Belsky score, reoperation, and complications were evaluated. Results: Radiological union was achieved in all patients in a mean duration of 4.2 (3–6) weeks. When the functional results of the patients were evaluated, the mean active metacarpophalangeal joint flexion was 87.3° (75°–90°), mean proximal interphalangeal joint flexion was 94.3° (65°–100°), mean distal interphalangeal joint flexion was 77.6° (75°–80°), and mean total range of motion was 259° (210°–270°). The grip strength of the fractured hand was 52.7 (40–58) kgW, whereas that of the healthy hand was 54.4 (42–60) kgW. The mean value of visual analog score was 0.8 (0–2), mean score for disabilities of the arm, shoulder, and hand was 7 (2–27), and mean distance between the finger pulpa and finger curve was 3 (0–8) mm. Conclusion: Plate-screw osteosynthesis in the extra-articular, unstable fractures of the proximal phalanx, which is “small” compared with the body but has a “major function” for the hand and upper extremity, allows for rigid fixation, short immobilization, and early motion in spiral/oblique-fragmented fractures. K-wire fixation, an alternative treatment modality, applied to selected fracture patterns with appropriate indications can achieve good–excellent results radiologically and functionally.
Design and application of sporopollenin microcapsule supported palladium catalyst: Remarkably high turnover frequency and reusability in catalysis of biaryls
(2017-01-15) Baran T.; Sargin I.; Kaya M.; Menteş A.; Ceter T.
Bio-based catalyst support materials with high thermal and structural stability are desired for catalysts systems requiring harsh conditions. In this study, a thermally stable palladium catalyst (up to 440 °C) was designed from sporopollenin, which occurs naturally in the outer exine layer of pollens and is widely acknowledged as chemically very stable and inert biological material. Catalyst design procedure included (1) extraction of sporopollenin microcapsules from Betula pendula pollens (∼25 μm), (2) amino-functionalisation of the microcapsules, (3) Schiff base modification and (4) preparation of Pd(II) catalyst. The catalytic activity of the sporopollenin microcapsule supported palladium catalyst was tested in catalysis of biaryls by following a fast, simple and green microwave-assisted method. We recorded outstanding turnover number (TON: 40,000) and frequency (TOF: 400,000) for the catalyst in Suzuki coupling reactions. The catalyst proved to be reusable at least in eight cycles. The catalyst can be suggested for different catalyst systems due to its thermal and structural durability, reusability, inertness to air and its eco-friendly nature.
Incorporation of sporopollenin enhances acid–base durability, hydrophobicity, and mechanical, antifungal and antioxidant properties of chitosan films
(2017-03-25) Kaya M.; Akyuz L.; Sargin I.; Mujtaba M.; Salaberria A.M.; Labidi J.; Cakmak Y.S.; Koc B.; Baran T.; Ceter T.
Sporopollenin-chitosan blend films were produced for the first time. Sporopollenin is a robust structural component of plant pollens exhibiting excellent features such as nontoxicity, biodegradability, biocompatibility, high thermal stability, durability to strong acid and base solutions and homogeneity in size. To benefit from these advantages, sporopollenin samples obtained from Betula pendula (silver birch) were incorporated into chitosan film at different concentration; 10, 20 and 40 mg in 100 mL chitosan gel (1%). Stereo microscopy, FT-IR and TG/DTG analyses showed that sporopollenin was successfully incorporated into the chitosan matrix. Incorporation of sporopollenin in gradually increasing amount into chitosan films was found advantageous in (1) enhancement in chemical durability of the films, (2) increment of hydrophobicity, (3) boosting the mechanical properties, (4) improvement of antifungal and (5) antioxidant activities. This study revealed that sporopollenin can be suggested as an effective blend material for biodegradable edible chitosan film production.
Preparation and characterisation of biodegradable pollen-chitosan microcapsules and its application in heavy metal removal
(2015-02-01) Sargin I.; Kaya M.; Arslan G.; Baran T.; Ceter T.
Biosorbents have been widely used in heavy metal removal. New resources should be exploited to develop more efficient biosorbents. This study reports the preparation of three novel chitosan microcapsules from pollens of three common, wind-pollinated plants (Acer negundo, Cupressus sempervirens and Populus nigra). The microcapsules were characterized (Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy and elemental analysis) and used in removal of heavy metal ions: Cd(II), Cr(III), Cu(II), Ni(II) and Zn(II). Their sorption capacities were compared to those of cross-linked chitosan beads without pollen grains. C. sempervirens-chitosan microcapsules exhibited better performance (Cd(II): 65.98; Cu(II): 67.10 and Zn(II): 49.55mgg-1) than the other microcapsules and the cross-linked beads. A. negundo-chitosan microcapsules were more efficient in Cr(III) (70.40mgg-1) removal. P. nigra-chitosan microcapsules were found to be less efficient. Chitosan-pollen microcapsules (except P. nigra-chitosan microcapsules) can be used in heavy metal removal.