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Öğe Bacterial strains effect on the nursery plants growth of 'Granny Smith' apple grafted on M-9, MM-106, and MM-111 rootstocks(Elsevier, 2023) Zenginbal, Hamdi; Öztürk, Ahmet; Faizi, Zaki AhmadSapling treatment with plant growth promoting bacterial strains (PGPBs), is not spread on a wide scale for horticultural crops; basically, their application in fruit crops has not received much attention. For this reason, 'Granny Smith' apple was grafted on three clonal rootstocks using the chip budding method on 15 May 2013; at the end of the vegetative season, saplings with shoot lengths of 40 or less than 40 cm were selected as plant materials for the second year of research (2014) at the Abant Izzet Baysal University, Bolu, Turkiye to consider bacterial strains including Burkholderia gladia BA7, Bacillus subtilus OSU142 and Bacillus megatorium M3 in combination with different apple clonal rootstocks effectivity on the growth of saplings. Considering the results, the sapling weight at initially recorded between 8.6 and 36.0 g, the sapling weight at the end of the growing season 66.6-110.7 g, and the sapling weight increase rate between 181.7 and 789.1%. Root fresh and dry weight and root dry mater ratio obtained respectively 34.9-61.6 g, 15.3-34.1 g, and 44.8-57.8%. Sapling shoot length at the beginning was recorded between 15.1 and 35.6 cm, sapling shoot length at the end of the growing season ranged from 77.7 to 103.7 cm, sapling shoot length increase rate between 150.4 and 549.3%, and the number of lateral branches varied between 1.0 and 7.5 pcs. Briefly, bacterial strains application combined with the different apple rootstocks significantly affected all the evaluated characteristics of apple saplings. In light of the result findings, bacterial application in the nursery of apples as well as other fruit crops would be advised for better development and organically production of nursery plants.Öğe Maintaining postharvest quality of medlar (Mespilus germanica) fruit using modified atmosphere packaging and methyl jasmonate(Elsevier, 2019) Öztürk, Ahmet; Yıldız, Kenan; Öztürk, Burhan; Karakaya, Orhan; Gün, Sefa; Gündoğdu, MüttalipThe study was aimed to assess the effect of methyl jasmonate (MeJA) and modified atmosphere packaging (MAP) on postharvest biochemical changes and quality loss in medlar fruit (Mespilus germanica cv. 'Istanbul'). Fruit were kept at 0 +/- 0.5 degrees C and 90 +/- 5% RH for 60 d. At the end of storage, as compared with the control, the weight loss, respiration rate and flesh firmness were lower in MAP-treated fruit. The SSC and vitamin C were lower in MAP-treated fruit than the control. The losses of total phenols, total flavonoid and antioxidant activity were significantly delayed by MAP during the storage. At the end of storage, the losses of oxalic acid, ascorbic acid and citric acid were delayed significantly only with the MeJA + MAP as compared with the control; and the losses of malic acid and fumaric acid were also delayed with both MAP and MeJA + MAP. The content of gallic acid, protocatechuic acid, ferulic acid, caffeic acid, quercetin and chlorogenic acid was higher in MeJA + MAP than the control. As a result, MeJA and MAP treatments could be used as an effective tool for delaying quality loss and maintaining of bioactive compounds in medlar fruit during cold storage.Öğe Oxidative stress and inflammatory response in patients with psoriasis; is there any relationship with psychiatric comorbidity and cognitive functions?(Taylor & Francis Ltd, 2019) Deveci, Erdem; Kocacenk, Tuba; Şahan, Ebru; Yılmaz, Onur; Öztürk, Ahmet; Kırpınar, İsmetObjectives: Psoriasis is a chronic, inflammatory skin disease which has been linked to psychopathology. Oxidative stress and inflammation are associated with atherogenesis and neuronal stress thus, cognitive functions might be impaired in psoriasis patients. We aimed to compare psychiatric comorbidity, neurocognitive functions, oxidative stress and inflammatory cytokine levels in psoriasis patients with healthy controls, besides to evaluate the effect of oxidative stress and inflammation on comorbidity and cognitive functions in psoriasis patients. Methods: A total of 37 patients (11 male and 26 female) aged between 18 and 65 years with at least 5 years of education who applied to the Dermatology Outpatient Clinic of the study hospital between study period; diagnosed with psoriasis by physical examination and histopathological evaluation were included in the study. The control group was formed from healthy individuals working for the hospital. Sociodemographic data form, Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), Semantic Verbal Fluency Test (K-A-S), oktem Verbal Memory Processes Test, Auditory Consonant Trigram Test and Wisconsin Card Sorting Test were performed to all participants. In addition, blood samples of participants were analysed to assess total oxidant stress (TOS), total antioxidant status (TAS), oxidative stress index (OSI) and proinflammatory cytokines TNF-alpha and IL-6 levels. Results: BDI and BAI scores, TOS, OSI, TNF-alpha and IL-6 levels of psoriasis patients were significantly higher than controls. Besides, the cognitive domains of learning, recall and verbal fluency in psoriasis patients were shown to be impaired. The increased levels of depression and anxiety in psoriasis did not significantly affect the serum TAS, TOS and OSI levels. Increased IL-6 and TNF-alpha levels were not significantly related to depression in patients with psoriasis. Conclusion: Psoriasis patients have higher risk factors than healthy controls for cognitive impairment, independent of depression, inflammation and oxidative stress levels.Öğe Preliminary results: Combination of MAP and aloe vera gel in medlar fruit(Springer, 2022) Öztürk, Ahmet; Öztürk, Burhan; Karakaya, Orhan; Gün, Sefa; Ateş, Umut; Gündoğdu, MüttalipThis study was conducted to investigate the effect of Aloe vera gel and modified atmosphere packaging (MAP) treatments on physiological and biochemical quality of medlar (Mespilus germanica L. cv. Istanbul) during 60 d storage (0 +/- 0.5 degrees C and 90 +/- 5% RH). During storage, the fruit in MAP with or without Aloe vera gel had higher firmness, total flavonoids, total phenolics, and antioxidant activity with lower weight loss and respiration rate than control fruit. At the end of storage, chroma, hue angle and titratable acidity values of Aloe vera + MAP-treated fruit were greater than the control and only MAP-treated fruit. MAP treatment alone or in combination with Aloe vera decreased SSC of fruit stored for 40 or 60 d. Phenolic compounds (caffeic acid, chlorogenic acid, ferulic acid, gallic acid and quercetin) of fruit stored in MAP alone or in combination with Aloe vera were higher than those of the control fruit. In general, there was no significant difference between MAP and Aloe vera + MAP treatments in phenolic substances except for gallic acid on day 20 and 60 of storage. The loss in ascorbic acid, citric acid, fumaric acid and malic acid was delayed by alone MAP or Aloe vera + MAP treatments. Aloe vera + MAP treatment maintained higher organic acid during storage than fruit underwent to MAP alone. Therefore, Aloe vera gel + MAP could be used as an efficient postharvest treatment for maintaining postharvest quality of medlar fruit.
