Browsing by Author "Çakir E."

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    Clear cell meningioma: Case report and literature review
    (Churchill Livingstone, 2003) Kuzeyli K.; Çakir E.; Usul H.; Karaarslan G.; Reis A.K.; Temiz C.; Baykal S.
    The clear cell meningioma is rare and a recently described histologic variant of meningioma. The most interesting aspect of clear cell meningioma is the high recurrence rate and agressiveness. Until now 17 intracranial clear cell meningioma cases had been reported in the English language literature. We present 2 new cases of clear cell meningioma which is discussed with the relevant literature. © 2003 Elsevier Science Ltd. All rights reserved.
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    Determination of in-row seed distribution uniformity using image processing
    (Turkiye Klinikleri Journal of Medical Sciences, 2016) Çakir E.; Aygün İ.; Yazgi A.; Karabulut Y.
    The objective of this study was to determine the seed distribution uniformity of seeding machines using a low sensitivity (maximum 300 frames per second (fps)) high-speed camera and image processing method for corn, cotton, and wheat seeds under laboratory conditions. For this purpose, a high-speed camera with 100, 200, and 300 fps was used to measure the seed drop from the seeding tube onto the sticky belt. Video images then were transferred to the image processing algorithm, from which seed distribution can be calculated. The calculated measurements were compared statistically with the measurements obtained from sticky belt tests. According to the results for determining corn and cotton seed spacing by high-speed camera, the camera was successful only for corn seeds. For cotton seeds, camera readings were significantly different from the readings from the sticky belt due to the fact that capturing the cotton seed trajectory was not sufficient compared to the corn seed trajectory. Measuring the wheat seed spacing by high-speed camera was impossible with lower speeds of the camera. Wheat kernels could not be captured successfully by the camera at speeds of 100 and 200 fps. Therefore, only 300 fps speed was used to measure the seed spacing of wheat. © TUBİTAK.
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    Comparison of immunogenicity for Sinovac-CoronaVac vaccine vs. natural infection during cancer treatment
    (Verduci Editore s.r.l, 2023) Çakir E.; Saydan D.; Gülbagci B.; Özen M.; Uǧurlu İ.; Demirci A.; Bilir F.; Hacibekiroglu İ.; Yildiz N.; Akcali S.; Altindis M.; Varim C.; Yaylaci S.; Bilir C.
    OBJECTIVE: Efficacy of the COVID-19 vaccines in cancer patients, especially during their active treatment, are lacking. Most of the studies in the literature compared the immunity in cancer patients with a cross-sectional cohort or retrospectively. Our study investigated Sinovac- CoronaVac COVID-19 vaccine immunogenicity and compared it with natural COVID-19 disease in cancer patients during their cancer therapy. PATIENTS AND METHODS: A total of 111 patients with cancer and who are on active treatment were included in the study. This is a single- center study and was designed prospectively. Two group of patients were included in the study, natural disease and vaccinated group. RESULTS: A total of 111 patients were included in the study, 34 of whom had natural COVID-19 disease. Antibody levels following the first dose vaccine were 0.4 (0-1.9) U/ml while after the second dose of vaccine were 2.6 (1.0- 7.25) U/ml. Immunogenicity levels were 82.4% in the natural disease group and 75.8% in the vaccinated group after the second shot of the vaccine. Immunogenicity rate was significantly higher in non-chemotherapy (receiving immunotehrapy/ targeted therapy or biologic agent) group compared to chemotherapy drug (92.9% vs. 63.3%, p=0.004). There was a difference between the antibody levels following the first and second vaccination [median (IQR): 0.3 (0-1.0) and 3.3 (2.0-6.7), p=0.001, respectively]. CONCLUSIONS: The present study revealed that the Sinovac-CoronaVac vaccine showed an acceptable immunogenicity following two shots in cancer patients who were receiving active systemic therapy. On the other hand, natural disease immunogenicity was higher than vaccinated group. © 2023 Verduci Editore s.r.l. All rights reserved.