Vocational Schools https://hdl.handle.net/20.500.12809/4 2026-04-19T09:41:11Z 2026-04-19T09:41:11Z Altunlu, Hakan Aydöner Çoban, Gökçe Gül, Ayşe Özaktan, Hatice https://hdl.handle.net/20.500.12809/11066 2023-10-31T12:26:37Z 2023-01-01T00:00:00Z

Effect of Rhizobacteria On Drought Stress Tolerance of Tomato Plants at Vegetative and Fruiting Growth Stages Altunlu, Hakan; Aydöner Çoban, Gökçe; Gül, Ayşe; Özaktan, Hatice This study including two successive experiments was conducted to evaluate the effect of native rhizobacteria (RB) strains on drought tolerance of tomato plants at the vegetative and fruiting growth stages. The first experiment was conducted in the growth room by growing plants in nutrient solution under polyethylene glycol induced drought stress, which initiated 7 days after planting and lasted 8 days by increasing the osmotic stress gradually every 48 h from Ψs = −0.25 to −1.00 MPa. Among the 12 RB tested, RB isolates 113 (Bacillus megaterium isolate NUC) and 377 (Bacillus cereus strain BBS7) were selected according to principal component analysis for testing in long term plant production. The second experiment was conducted in the greenhouse by growing plants in perlite filled pots for 128 days after transplanting. Irrigation was based on the water consumption of the plants, and the plants were irrigated to cover well-watered (100% FC) or drought (50% FC) of this amount. For both experiments, seeds were inoculated with the RB strains before sowing. RB inoculation increased plant growth, leaf pigment contents, antioxidant enzyme activities and ascorbic acid level, but reduced malondialdehyde levels in tomato plants under drought stress. The marketable yield was increased 8.7 and 10.6% in the absence of water stress, and 70.2 and 59.9% under water stress by RB 113 and RB 377, respectively.

2023-01-01T00:00:00Z Tamfu, Alfred Ngenge İspirli Doğaç, Yasemin Ceylan, özgür Dediu, Andreea Botezatu Dinica, Rodica Mihaela https://hdl.handle.net/20.500.12809/11064 2023-10-31T11:49:57Z 2023-01-01T00:00:00Z

Antibiofilm and Anti-Quorum Sensing Potential of Safely-Synthesized Hydrated Zirconium Oxide-Coated Alginate Beads against Some Pathogenic Bacteria Tamfu, Alfred Ngenge; İspirli Doğaç, Yasemin; Ceylan, özgür; Dediu, Andreea Botezatu; Dinica, Rodica Mihaela Water is essential to life, but access to uncontaminated water remains a global challenge. Metal oxides possess particular characteristics required for removing heavy metals, inorganic and organic pollutants from wastewater as well as inhibiting microorganisms. Zirconium oxide and alginate which are nontoxic materials were used to synthesize hydrated zirconium oxide-alginate coated materials, ZAB-1 (1.5% alginate) and ZAB-2 (2.0% alginate). FT-IR was used to characterize the functional groups while surface morphology was characterized using SEM. XRD was used to characterize the material structure of the resulting composite. Against Chromobacterium violaceum CV12472, minimal inhibitory concentrations (MICs) were 0.625 mg/mL for ZAB-1 and ZAB-2 while against C. violaceum CV026, the MIC values were 0.625 mg/mL and 1.25 mg/mL for ZAB-1 and ZAB-2, respectively. At MIC and sub-MIC concentrations, the synthesized beads inhibited the production of violacein in C. violaceum CV12472 and C. violaceum CV026, indicating that they can reduce QS-mediated virulence factors in bacteria. Antimicrobial activity was evaluated against Staphylococcus aureus, Enterococcus faecalis, Listeria monocytogenes, Escherichia coli, Pseudomonas aeruginosa, Salmonella typhi, Candida albicans, and Candida tropicalis, and MIC values ranged from 1.25 mg/mL to 10 mg/mL. Biofilm inhibition percentages were relatively high against S. aureus, E. coli, and C. albicans. It is observed that the increase in the alginate amount from 1.5% to 2.0% improves the antimicrobial, anti-QS, and antibiofilm effects. The alginate makes the zirconium oxide particles biocompatible and easily recoverable from water after treatment. ZAB-1 and ZAB-2 materials can therefore be sustainable materials for water treatment since it can inhibit pathogenic bacteria in water and equally satisfy environmental friendliness. The synthesized particles reduced the chances for antimicrobial resistance since they disrupted QS in bacteria and eliminated biofilms, thereby preventing biofouling of microbial communities in water. Future prospects of this study involve biofiltration, that is, the use of the synthesized composite in the development of a safe and compatible biofilter for water purification.

2023-01-01T00:00:00Z Özden, Fatih https://hdl.handle.net/20.500.12809/11045 2023-10-26T13:18:52Z 2023-01-01T00:00:00Z

Comments on “Concurrent validity and precision of the thumb disability examination (TDX) in first carpometacarpal osteoarthritis” by Johnson et al. Özden, Fatih Letter to editor

2023-01-01T00:00:00Z Özden, Fatih https://hdl.handle.net/20.500.12809/11043 2023-10-26T12:49:55Z 2023-01-01T00:00:00Z

Letter to the Editor: “Translation and validation of Cerebral Palsy Quality of Life Questionnaire‐Teen in Hong Kong Chinese population [CP QoL‐Teen (HK)]” Özden, Fatih Letter to editor

2023-01-01T00:00:00Z