Aksaray Üniversitesi Kurumsal Akademik Arşivi
DSpace@Aksaray, Aksaray Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Protective Effects of Chrysin Against Diclofenac-Induced Nephrotoxicity in Rats via Attenuation of Oxidative Stress, Apoptosis and Endoplasmic Reticulum Stress
(John Wiley and Sons Inc, 2025) Çağlayan, Cüneyt; Ekinci, İzzettin; Gür, Cihan; Ayna, Adnan; Bayav, İbrahim; Kandemir, Fatih Mehmet
Diclofenac (DCL) is a broadly prescribed non-steroidal anti-inflammatory drug (NSAID) for pain management and has been linked to nephrotoxicity despite its therapeutic benefits. This study provides new insights into the palliative impacts of chrysin (CH) against DCL-induced kidney damage by modulating oxidative injury, endoplasmic reticulum (ER) stress and apoptosis. The rats were divided into five groups: the control group (Group 1), CH-only group (50 mg/kg, Group 2), DCL-only group (50 mg/kg, Group 3), DCL + CH (25 mg/kg, Group 4), and DCL + CH (50 mg/kg, Group 5). DCL injection led to significant renal damage marked by elevated serum urea, creatinine and malondialdehyde (MDA) levels, reduced glutathione (GSH) concentration, and decreased activities of antioxidant enzymes (glutathione peroxidase, superoxide dismutase and catalase). The mRNA expression levels of Ho-1 and Nrf2 were also suppressed. Additionally, DCL treatment triggered apoptosis as evidenced by increased expression of Bax and caspase-3 alongside decreased Bcl-2 expression. Furthermore, DCL induced ER stress was confirmed by upregulation of Perk, Ire1, Atf-6, and Grp78 transcription levels. Also, it was demonstrated that DCL treatment upregulated Mmp2 and Mmp9 levels. Treatment with CH significantly mitigated these adverse effects suggesting that CH effectively protects DCL-induced kidney toxicity by targeting multiple pathways. In summary, this study highlights the importance of CH as a promising therapeutic agent for alleviating kidney damage associated with DCL toxicity.
The Protective Effects of Chrysin on Acrylamide-Induced Hepatotoxicity: Insights Into Oxidative Stress, Inflammation, Apoptosis, Autophagy, and Histological Evaluation in Rats
(John Wiley and Sons Inc, 2025) Gencer, Selman; Akaras, Nurhan; Şimşek, Hasan; Gür, Cihan; İleritürk, Mustafa; Küçükler, Sefa; Kandemir, Fatih Mehmet
Acrylamide (ACR) is a toxic chemical with a high carcinogenic risk that is released as a result of heating or processing foods at high temperatures. Chrysin (CHR) is a flavonoid that is naturally found in foods such as honey and passionflower and stands out with its antioxidant, anticancer, and anti-inflammatory properties. This study aims to determine the protective effects of CHR in ACR-induced hepatotoxicity. ACR was administered orally at a dose of 38.27 mg/kg; CHR (25 or 50 mg/kg) was administered orally for ten days. Biochemical and molecular methods were used to investigate oxidative stress, inflammation, and apoptotic markers in liver tissue. Additionally, histological methods were used to determine the liver tissue's structural and functional characteristics and autophagy. CHR treatment alleviated ACR-induced oxidative stress by increasing antioxidants (SOD, CAT, GPx, GSH) and reducing increased oxidant MDA. CHR reduced inflammatory activity by inactivating NF-κB and pro-inflammatory cytokines. ACR-induced increases in apoptotic Casp-3, Casp-6, Casp-9, and Bax were reduced by CHR, while the decreased level of antiapoptotic Bcl-2 was increased. It was also determined immunohistochemically that CHR inhibited autophagic Beclin-1 activity. CHR was effective in reducing ACR-induced hepatotoxicity damage and may be an effective treatment option.
Optimization of Carbon and Nitrogen Source on the Production of Pectinase Enzymes in Solid-state Fermentation by Cyberlindnera fabianii UNJCC Y-144 and Candida tropicalis UNJCC Y-148-149 Isolated from Lai Fruit
(Journal of Pure and Applied Microbiology, 2025) Sukmawati, Dalia; Hasanah, Rifdah; Adisyahputra; Husna, Shabrina Nida Al; Ratnaningtyas, Nuniek Ina; Aksoy, Adil; El-Enshasy, Hesham Ali
Yeasts are prevalent on the surfaces and within the pulp of ripening fruits, where they utilize available sugars and nutrients to thrive. This study focuses on the endemic Lai fruit (Durio sp.) from Kalimantan, Indonesia, which contains pectin, a key substrate for pectinolytic yeasts. The activity of these yeasts, particularly in producing pectinase enzymes, is influenced by the carbon and nitrogen resources present in the fruit. We aimed to evaluate the effects of varying carbon sources (glucose, sucrose, and pectin) and nitrogen sources (peptone, urea, and ammonium chloride) on the pectinase activity of yeasts isolated from Lai fruit. In our screening, five out of twenty yeast isolates demonstrated pectinase production, with three isolates UNJCC Y-144, UNJCC Y-148, and UNJCC Y-149 selected for further analysis. The initial screening revealed pectinolytic index values of 0.55 ± 0.07 mm, 0.45 ± 0.02 mm, and 0.49 ± 0.06 mm for UNJCC Y-144, UNJCC Y-148, and UNJCC Y-149, respectively. Molecular identification confirmed that UNJCC Y-144 is Cyberlindnera fabianii (100% homology), while UNJCC Y-148 and UNJCC Y-149 are Candida tropicalis (100% and 99.83% homology, respectively). Notably, Cyberlindnera fabianii UNJCC Y-144 exhibited the enzyme activity (EA) in a medium lacking pectin, ranging from 48.68 ± 2.84 to 32.05 ± 2.46 U/mL. These findings underscore the potential of utilizing local yeasts for biotechnological applications in enzyme production, particularly in the food industry, where pectinase plays a critical role in processing fruit and improving juice extraction efficiency.
Electrical properties, conduction mechanisms, and voltage dependent curves of interface traps, series resistance in Au/(Sn:Fe2O3)/n-Si structures using impedance measurements
(Springer, 2025) Baştuğ, A.; Khalkhali, A.; Sarıtaş, S.; Yıldırım, M.; Güçlü, Ç.Ş.; Altındal, Ş.
In this work, electrical properties in the constructed Au/(Sn:Fe2O3)/n-Si (MIS/MOS) structures have been analyzed using impedance-spectroscopy model (ISM) in wide range frequency and voltage to get more accuracy and reliable results on the electrical parameters, interface traps (Nss or Dit) and conduction mechanisms. The doping donor-atoms (Nd), diffusion-potential (Vd), barrier-height (Φb), depletion layer width (WD) was calculated from the slope/intercept of the C−2-V plots for various frequencies. The Nss and their life/relaxation times (τ) versus voltage profiles was extracted from conductance technique. The observed some changes in these-parameters were explained by the interlayer, Rs, Nss polarization. However, while the Nss and Maxwell–Wegner polarization are usually dominate in inversion and depletion zones at lower-frequencies, Rs and interlayer dominate only at accumulation zone at higher-frequencies. The Rs vs V curves for various frequency were also extracted from the Nicollian & Brews technique. The obtained results are indicated that the interlayer, Nss, and polarization are more dominate on the ISM which is considering in calculation of electrical features.
Natural sporopollenin microcarriers: Morphological insights into their functional performance for drug encapsulation and release
(Elsevier B.V., 2025) Aylanc, Volkan; Peixoto, Andreia F.; Akyüz, Lalehan; Vale, Nuno; Freire, Cristina; Freire, Cristina; Vilas-Boas, Miguel
Natural sporopollenin microcapsules (SMCs) derived from pollen offer versatility and efficiency for different applications, from environmental remediation to food and therapeutics delivery. A critical gap remains in understanding the relationship between SMCs morphologies and their effectiveness in drug loading and delivery. Herein, we encapsulated 5-Fluorouracil (5-FU), a model anticancer drug, into SMCs derived from seven bee monofloral pollens, each exhibiting distinct morphological features, and examined how their loading and release performance correlated with their morphology. Microscopic and particle size analyses revealed that the chemically purified SMCs were hollow, with sizes ranging from 11.0 to 35.6 μm, without significant size changes after drug loading. Encapsulation efficiency achieved through vacuum-assisted loading (18–28 %) generally surpassed that of passive and compression loading techniques. Moreover, there was a trend of increasing encapsulation efficiency with larger SMC sizes, albeit with some exceptions. In a sequential release environment simulating the in vitro gastrointestinal tract and colonic fermentation, smaller SMCs exhibited a faster release profile, whereas larger ones demonstrated a slower sustained release. The quantity and shape of apertures on SMCs walls significantly impacted their drug-loading capacity and release characteristics. Additionally, natural SMCs remained structurally intact even in the presence of digestive enzymes, varying pH levels, and colonic bacteria, indicating minimal degradation under these conditions. Overall, the findings highlight the significant influence of SMCs morphologies on their functional performance and provide a list of SMCs-based microstructures to guide drug release applications.
