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Determination of copper (II) in seafood and water samples by ICP-OES using magnetic titanium aluminum carbide nanocomposite for solid phase microextraction
No full textThis study presents a method for the quantitative determination of copper ions (Cu (II)) in various seafood using solid phase microextraction (SPME) with magnetized maximum phase titanium aluminum carbide (Ti3AlC2) nanocomposite (MAX phase-MSPE). The aim of this method is to separate copper from the complex matrix environment and ensure a measurable concentration level. Optimized extraction conditions were established, including pH, extraction time, sample volume, and eluent concentration. The analytical significant parameters of the MAX phase-MSPE method have been assessed through limit of detection (LOD), limit of quantification (LOQ), recovery (R%), and certified reference material studies to obtain high accuracy and sensitivity. The LOD, LOQ, preconcentration factor, and relative standard deviation were obtained as 0.37 and 1.2 µg/L, 10, and % 4.1, respectively. The developed method demonstrates high selectivity toward copper ions (Cu (II)) in both food and water samples. This makes the approach particularly suitable for applications in food safety monitoring and environmental analysis, where precise detection and quantification of copper ions are critical
Influencing the draping behaviour of solid epoxy prepregs by applying 3D-printed resin patterns
No full textThis study presents a novel strategy to overcome the limitations of solid resin prepregs (SRPs) − namely the inability to drape at room temperature and hindered gas evacuation during vacuum-bag-only (VBO) processing − by 3D-printing a regular, uncured solid epoxy resin (SR) pattern on a dry woven textile. The locally patterned resin distribution preserves dry textile regions, enabling room temperature drapeability and more robust VBO-processing due to improved gas evacuation. By adjusting pattern parameters such as element geometry and coverage, the draping behaviour can be controlled to adapt to a desired draping condition. In order to be able to design the right pattern for given draping conditions, the influence of these parameters on bending and shearing was studied. Manual draping showed that bending radii down to 4 mm were achievable, governed only by the element length in bending direction, while coverage had no significant effect. In contrast, picture-frame-tests showed that the shearing is mainly influenced by the coverage and that a maximal shearing angle of 30° can be achieved. These results show that the SRPs bending and shearing can be independently influenced through pattern design. The derived structure–drapeability relationships enable targeted design of SRPs for robust, autoclave-free composite manufacturing.</p
KONTROLLÜ HİPOTANSİYON UYGULANAN ENDOSKOPİK VE MİKROSKOPİK KULAK CERRAHİSİ OLGULARINDA DÜŞÜK DOZ TRANEKSAMİK ASİT KULLANIMININ CERRAH MEMNUNİYETİ, YAN ETKİ VE KOMPLİKASYONLAR ÜZERİNE ETKİSİ
No full textYıldız Kenter, Episode 2: Expanding Horizons — A Travel Grant for a Turkish Stage Icon
No full textYıldız Kenter and her brother received the İlhan İskender Cup in 1960 for their excellent acting work. She received this distinction once more in 1962 and Turkish Women’s Association crowned her as Woman of the Year in 1963. Kenter made good use of this symbolic capital when she approached the Rockefeller Foundation again, in 1963. In a letter to Robert W. Crawford, one of the assistant directors of the Humanities and Social sciences division of the Foundation, she stated how keen she was to keep abreast of American theatre developments which she had not been able to see in person since 1955. Yet, she underlined that she managed to stay current of undertakings in major European theatre centres including Edinburgh, London, Paris and Stratford, thanks to sojourns paid from her own funds. Because she was now teaching at the İstanbul Conservatory, she thought it was time to visit university theatres in U.S.A. to observe rehearsals, classes, as well as acting and stage techniques. The best moment for her would be July 1963, following her Anatolian tour. Moreover, she wanted to go with her brother Müşfik Kenter. Kenter concluded her letter by highlighting her aforementioned awards8.The Rockefeller Foundation officers agreed, considering that this tour would enhance the Kenters Turkish theatre work through the combination of domestic traditions with international insights. They were given a grant to visit theatrical centers in Europe, the United States, and Canada for as much as 92 days, beginning July 1, 1963. Kenter’s own terms were used almost literally in the Foundation Annual Report.</p
Effect of low nitrogen stress on plant growth traits of double haploid melon (Cucumis melo var. cantalupensis) lines with different low nitrogen Tolerances
No full textn recent years, excessive nitrogen (N) fertilizer application has adversely affected the ecosystem. Additionally, inefficient fertilizer use can diminish soil fertility and result in the loss of organic matter. Limiting access to N fertilizer leads to increased prices, which consequently results in reduced crop productivity. Developing/breeding nitrogen-efficient plants is another strategy to enhance N uptake and efficiency in crops. The aim of this study was to assess the genotypic differences of 27 double haploid (DH) melon genotypes under low nitrogen (0.3 mM) conditions based on biomass parameters in hydroponic growth conditions. Significant differences were determined among the genotypes in all the parameters investigated. At low nitrogen levels, the highest stem fresh weight was recorded in genotypes C19 (48.53 g/plant) and D10 (42.57 g/plant), while the highest leaf fresh weight was observed in genotypes C8 (51.57 g/plant) and C19 (51.37 g/plant). In plants subjected to low N, the highest stem dry weight was found in genotypes E13 and C19, whereas the lowest was recorded in genotypesB9 and C5 with 2.10 g/plant. Under low nitrogen conditions, genotypes I7 and CA7 exhibited the highest root fresh and dry weights, respectively. The average shoot/root ratio of melon genotypes under low nitrogen conditions was 1.40, with the highest ratio in genotype B5 (2.69) and the lowest in genotype I7 (0.76). Melon genotypes had an average root length of 4000.92 cm under low nitrogen conditions, with genotype I7 having the longest root with 8194.43 cm and genotype B5 having the shortest root with 1795.34 cm. Under low nitrogen stress, genotypes displayed significant variation in plant growth. In terms of shoot fresh weight, there was a two-fold difference between susceptible and tolerant genotypes, while for root fresh weight, the difference was four-fold. This indicates that tolerance to nitrogen is attributed to changes in the root system rather than the shoot system.</p
Properties of monotonic solutions to half-linear second-order delay differential equations
No full textThis paper establishes new monotonic properties of nonoscillatory solutions for second-order half-linear functional differential equations with delayed argument (a(r)(u′(r))m)′ = b(r)um(φ(r)) where m ∈ (0, 1). We develop several key monotonicity results for Kneser solutions and use these properties to derive criteria for the elimination of bounded nonoscillatory solutions. Our approach extends known techniques from linear differential equations to the half-linear case, providing new insights into the qualitative behavior of solutions