Araştırma Makaleleri

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  • Öge
    Evaluation of the Relationships between Obesity and Central Retinal Thickness, Retinal Nerve Fiber Layer, Intraocular Pressure, and Central Corneal Thickness in Children
    (Acıbadem Mehmet Ali Aydınlar Üniversitesi, 2022-01-01) Olcaysü, Osman Okan; Karasu, Buğra; Olcaysü, Elif; Çayır, Atilla; Çelebi, Ali Rıza Cenk
    ABSTRACT Purpose: The purpose of this study was to investigate the effect of childhood obesity on the retinal nerve fiber layer (RNFL), retinal thickness, central corneal thickness and intraocular pressure. Method: Children with obesity (n:24) (Group 1; n:48 eyes) and healthy children (n:23) (Group 2; n:46 eyes) were included in the study. Average RNFL thickness, central 1 mm diameter of foveal thickness (CFT) and subfoveal choroidal thickness (SFCT) were measured using the fourier domain - optical coherence tomography (FD-OCT). Central corneal thickness (CCT) was measured using contact ultrasonic pachymetry and intraocular pressure (IOP) using Goldmann applanation tonometry. Results: The mean IOP in Group 1 was found to be significantly higher (p=0.002) and 16.1 ± 3.1 mmHg in group 1 and 13.6 ± 3.2 mmHg in group 2, respectively. Mean RNFL, CFT and SFCT significantly were lower in group 1 (p < 0.05) than group 2. The average RNFL was detected to 107.9 ± 10.5 µm in group 1 and 112.6±11.8 µm in group 2, respectively (p=0.001). Mean CFT was found to be 231.6±14.4 µm in group 1 and 245.9±19.98 µm in group 2, respectively (p=0.001). The average SFCT was observed to 193.3±15.3 µm in group 1 and 221 ± 25.1 µm in group 2, respectively (p<0.001). Although CCT was relatively higher in group 1, no statistically significant difference was observed among the groups (p=0.08). There was a positive correlation between the presence of obesity and mean IOP measurements (r = 0.847, p = 0.011), and besides a negative correlation was detected between mean RNFL thickness and mean weight of the patients (r = -0.749, p = 0.039). Conclusion: In current study, it should be kept in mind that elevated IOP and decrement of RNFL thickness in children with obesity increased the risk of developing glaucoma, as well as decreased CFT and SFCT may form the basis for the development of macular diseases in future.
  • Öge
    Detection of H. pylori in Pediatric Patients’ Stool Sample by Multiplex Urease PCR
    (Acıbadem Mehmet Ali Aydınlar Üniversitesi, 2022-01-01) Öktem-Okullu, Sinem; Işık, Oğuz Can; Sesin Kocagöz, Ayşe; Akyar, Işın
    ABSTRACT Background and objectives: This study aims to detect the H. pylori infection in pediatric patients’ stool samples by using a multiplex urease PCR assay. Materials and Methods: A retrospective analysis was performed and the H. pylori multiplex urease PCR test from a stool sample of 55 pediatric patients was evaluated from August 2017 to November 2018 compared with the H. pylori antigen test and histopathology. Results: Thirty-six patients (65%) were detected H. pylori-positive including nineteen boys (50%) and nineteen girls (50 %) by H. pylori multiplex urease PCR test. Fifteen (54 %) of the positive patients were in the 0-6 age range, eighteen (95%) in the 7-12 age range, and three (38%) in the 13-18 age range. Comparison results with the histopathology and H. pylori antigen test were showed that the positive predictive value of the multiplex urease PCR test for the stool sample was 72.22%. The test could detect a negative sample of 100 %. Conclusions: Due to the results of this study it was showed that the prevalence of H. pylori infection is still high for pediatric patients. The multiplex urease PCR test for stool samples could be used in the clinic detection of H. pylori as a non-invasive method and easy to applicable method, but it needs to be evaluated for high specificity and sensitivity to detect accurate results.
  • Öge
    Evaluation of Feed Strategy for High Quality Biosimilar IgG Production in CHO Cell Fed-batch Process
    (Acıbadem Mehmet Ali Aydınlar Üniversitesi, 2022-01-01) Üstüner, Berna; Dayankaç Ünver, Seçil; Turgut, Tunç; Demirhan, Deniz; Ayyıldız Tamış, Duygu
    ABSTRACT Purpose: Chinese Hamster Ovary (CHO) cells are currently the leading hosts for biosimilar Immunoglobulin G (IgG) production in the biopharmaceutical industry. Most eukaryotic proteins are glycosylated, and charge variants affect both the in vivo and in vitro properties of monoclonal antibodies (mAb). Adjusting the N-glycosylation patterns and charge variants while achieving high antibody titer is a production challenge. In this study, the effects of feed type and strategy on cell growth, product titer, glycosylation and charge variation were investigated using different CHO clones producing different IgG mAbs. Methods: Cultivated CHO cells were supplemented with different feeding schemes, under fed-batch productions of 14 days. Screenings were conducted in spin-tubes and further investigated in 3L bioreactor systems. Results: Change in feed strategy decreased productivities by 10.4% (P < 0.05), while it increased non-fucosylated glycoforms by 33.3% and enhanced galactosylation up to 3-folds. Basic variants were observed to increase 2.5 folds. Conclusion: These remarkable alterations are of great importance in terms of mAb quality, in a manufacturing point of view, as they provide modulation of efficacy and safety. This reveals that feed strategy is a major driving force that significantly impacts culture longevity, galactosylated glycoforms, high-mannose glycan contents and charge variants.