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Biological assays, electrochemical behavior, and theoretical DFT calculations of Ru(II) complexes of chiral phosphinite based based on β-amino alcohols: Transfer hyrogenation of ketones using a HCOOH/Et3N mixture
No full textSynthesis of two phosphinite ligands based on β-amino alcohols, in high yields has been demonstrated. When we treated [Ru(arene)(μ-Cl)Cl]2 {arene:p-cymene,benzene} with chelating phosphinite ligands, we obtained neutral Ru(II)-complexes possessing the general formula [Ru(arene)phosphiniteCl2]. The structure of the ligands and complexes was confirmed using analytical and spectroscopic techniques. The quantum chemical calculations were carried out for the ruthenium complexes at the DFT/CAM-B3LYP level of theory in gas phase. The phosphinite complexes were subjected to cyclic voltammetry studies in order to determine the energies of HOMO and LUMO levels and to estimate their electrochemical and some electronic properties. Organic complex-based memory substrates were immobilized using TiO2-modified ITO electrodes, and the memory functions of phosphinite-based organic complexes were verified by chronoamperometry (CA) and open-circuit potential amperometry (OCPA). In the present study, the antioxidant potentials of ruthenium-based p-cymene and benzene complexes through DPPH radical scavenging, metal chelating, and reducing power activities were also determined. In addition, DNA binding abilities and antimicrobial activities of these complexes against pathogenic bacteria were studied. Finally, the ruthenium complex, (2S)-1-{[(2S)-2-[(diphenylphosphanyl)oxy]propyl][(1R)-1-phenylethyl]amino}propan-2-yldiphenyl phosphinitobis[dichloro(η6-benzene)ruthenium(II)] also catalyzed asymmetric transfer hydrogenation of acetophenone with high conversion (up to 99%) and good enantioselectivity (ee up to 89 %), in the existence of formic acid and triethylamine in dichloromethane medium under air atmosphere
The role of technological devices in parent-children interactions: The correlated variables of children’s well-being and life satisfaction
No full textThis study aims to examine children’s well-being and life satisfaction in terms of various variables related to parents’ and children’s problematic technology usage. Specifically, parent/child responses during their technology use and parents' phubbing and technoference behaviors were considered. The study was conducted with 185 children (8–14) and their parents (mother = 96, father = 89). The data were analyzed by performing correlation analysis, multiple regression analysis, t test, and one-way ANOVA. According to the results, there were negative correlations between children’s life satisfaction and age, children’s technological device (smartphone, computer) usage time, and children/parents responding negatively to each other when engaged in technological devices. Children’s well-being was negatively correlated to their age and children/parents responding negatively to each other when engaged in technological devices. A positive correlation was found between children’s life satisfaction and well-being as well as parents’ phubbing and technoference. According to another result, the well-being of children having their own computer was significantly higher than those who do not have a computer. Finally, children/parents responding negatively to each other when engaged in technological devices negatively predicted the children’s life satisfaction and well-being
Development software program for finding photovoltaic cell open-circuit voltage and fill factor based on the photovoltaic cell one-diode equivalent circuit model
No full textThe photovoltaic (PV) cell is the smallest building block of the PV solar system and produces voltages between 0.5 and 0.7 V. It acts as a current source in the equivalent circuit. The amount of radiation hitting the cell determines how much current it produces. The equivalent circuit of an ideal PV cell consists of a diode and a parallel current source. In order to express losses in applications, series and parallel resistance are added to the ideal equivalent circuit of the PV cell. There are many equivalent circuits in the literature for modeling the equivalent circuit of a PV cell. The single-diode equivalent circuit is the most widely used model because of its simplicity and ease of analysis. There are several methods available to estimate and analyze the parameters of PV cell models, such as Newton Raphson method, Lambert-W function, etc. In this study, the Newton Raphson method was used to find the equivalent circuit parameters of a PV cell. Fill factor is used to determine the quality of electricity generated by the photovoltaic cell. Open-circuit voltage is the maximum voltage value that the PV cell can transmit. The analysis of PV cell fill factor and open-circuit voltage was carried out using the developed software program. Then, the open-circuit voltage and fill factor were found using the software program prepared in MATLAB and given in Appendix
Turkey at the London Monetary and Economic Conference of 1933
Full text linkBu çalışmanın amacı, 1929 Dünya Ekonomik Krizi’ne karşı uluslararası ortak çözümler bulunması düşüncesiyle Milletler Cemiyeti tarafından toplanan 1933 Londra Para ve İktisat Konferansı’nın gündem maddelerini ve sonuçlarını, Türkiye’de Cumhuriyet’in ilk yıllarında izlenen ekonomi politikaları açısından değerlendirmektir. Büyük Buhran’ın etkili olduğu yıllarda devletler, krize karşı mücadele ederken birbirlerinden bağımsız iktisat politikaları izliyorlardı. Fakat bu durum sorunları çözmediği gibi, ekonomik krizi daha da derinleştiriyordu. Bu noktada konferanstan beklenen; ABD, Büyük Britanya ve Fransa gibi büyük devletlerin para politikaları ile gümrük duvarları üzerindeki anlaşmazlıklarının sona erdirilmesi ve küresel ekonomik krize karşı ortak önlemlerin alınmasıydı. Ancak konferans sonunda para politikalarında bir uzlaşmaya varılamadı ve konferansta imzalanan Gümrük Ateşkesi’nin ömrü ise sadece birkaç ay oldu. Diğer yandan konferansın katılımcı ülkelerinden Türkiye, bu dönemde gümrük duvarlarını yüksek tutuyor ve para politikalarında devalüasyon karşıtı bir siyaset benimsiyordu. Bu politika esasen, “merkezdeki” sanayileşmiş devletlerin aleyhine, Birinci Dünya Savaşı’ndan sonra dünya genelinde işleyen sürecin bir parçasıydı. Çalışma ile ulaşılan sonuçlardan biri, Londra Konferansı’ndaki görüş ayrılıklarının, uluslararası konjonktürde Türkiye gibi bağımsız iktisat politikaları izleme arzusunda olan “çevre” ülkelere avantaj sağladığı yönündedir. Makale ile varılan bir başka sonuç ise, küresel ekonomide Birinci Dünya Savaşı ile başlayıp 1929 Krizi ile hızlanan değişim sürecinin 1933’te Londra Konferansı’nda gün yüzüne çıkmış olmasıdır
Fe3O4@SA MNCs Synthesis, Characterization, and First-time Use in Hydrogen Production by NaBH4 Hydrolysis
No full textHydrogen is a clean energy carrier that will reduce dependence on fossil fuels and contribute to reducing the harmful effects on the environment resulting from using fossil fuels. Hydrogen is produced by the hydrolysis of sodium borohydride (NaBH4), one of the chemical hydrides, using a catalyst. In this study, Fe3O4@Salicylic acid magnetic nano-catalyst (Fe3O4@SA MNCs) was synthesized using the co-precipitation technique. The structural, physical, and chemical properties of the produced Fe3O4@SA MNCs were characterized by FT-IR, XRD, VSM, SEM, and SEM-EDX methods. At room temperature, the effect on hydrogen production performance was examined in the amounts of Fe3O4@SA MNCs (10, 25, 50, 75, and 100 mg), NaOH (0, 10, 20, and 25 mg), and NaBH4 (25, 50, 100, 150 and 200 mg). The highest hydrogen generation rates (HGR) were obtained using 10 mg Fe3O4@SA MNCs, 150 mg NaBH4, and 0 mg NaOH at room temperature. The obtained HGR value was calculated as 400 mL gcat-1.min-1. Fe3O4@SA MNCs were used for hydrogen production for the first time in this study. This study showed that Fe3O4@SA MNCs exhibit catalytic properties and are a promising, efficient catalyst in hydrogen production from NaBH4
Black box in overactive bladder: Central sensitization and its relationship with urinary symptom severity and quality of life
No full textAim: To examine central sensitization (CS), and to investigate the relationship between CS, and urinary symptom severity, and quality of life (QoL) in women with overactive bladder (OAB).
Materials and methods: A total of 144 women with OAB included the study. CS with the Central Sensitization Inventory (CSI), urinary symptom with the Overactive Bladder Questionnaire-Version 8 (OAB-V8), bladder diary and Patients' Perception of Intensity of Urgency Scale (PPIUS) and QoL with the King's Health Questionnaire (KHQ) were assessed.
Results: It was found that 47.9% (n = 69) of women with OAB had CS. It was observed that the CSI score was related to the OAB-V8 score (ρ = 0.327; p < 0.001) and the average number of voids/day (ρ = 0.291; p < 0.001). Additionally, urgency severity was higher in women with OAB with CS than in women with OAB without CS (p = 0.006). There was a relationship between the CSI score and KHQ-incontinence impact (ρ = 0.250; p = 0.012), KHQ-personal relationship (ρ = 0.253; p = 0.002), KHQ-sleep/energy (ρ = 0.180; p = 0.031), KHQ-emotional state (ρ = 0.310; p < 0.001) and KHQ-severity measurement scores (ρ = 0.391; p < 0.001).
Conclusion: In this study, it was observed that the majority of women with OAB had CS. It was found that more severe symptoms of CS were associated with worse urinary symptom severity and QoL in these patients. It may be beneficial to evaluate CS in the management of OAB and to consider CS when determining treatment strategies
2021 Yılı Karain Mağarası Kazıları
No full textKarain E Gözü kazıları önceki yıllarda olduğu gibi yine önemli arkeolojik veriler sunmuştur. Söz konusu alanda geçmiş yıllarda yapılan çalışmalar sonucunda Orta Paleolitik Döneme ait, ayrımı net bir şekilde yapabilen bir oturma tabanı ile karşılaşılmıştı
Several biological properties and synthesis of 2-(4-methylthiazol-5-yl) ethoxy substitute zinc phthalocyanine
No full textIn this study, 4-(2-(4-methylthiazol-5-yl) ethoxy) phthalonitrile (3) and zinc phthalocyanine complex (4) were synthesized and characterized. UV–vis and fluorescence spectra, aggregation, and fluorescence parameters of the zinc phthalocyanine compound were investigated. As biological properties, DPPH radical capture, antidiabetic, DNA cutting, antimicrobial, photodynamic antimicrobial, anti-biofilm activities, and microbial cell viability parameters of the compounds were determined. The highest antioxidant activity was found as 62.80% at 100 mg/L concentration with compound 4, and compound 4 also showed the best antidiabetic activity as 65.17% at 400 mg/L concentration. In DNA cutting activity, it was determined that 3 and 4 cut DNA at all concentrations. For compounds 3–4, the minimum inhibitory concentration (MIC) values were found to be 32 and 16 mg/L for Enterococcus hirae and Enterococcus feacalis, respectively. The strongest MIC value of photodynamic antimicrobial activity was achieved as 4 mg/L for E. feacalis with 4. It was observed that both compounds inhibited the microbial viability activity of Escherichia coli by 100% at concentrations of 100 mg/L. Compound 4 inhibited biofilms of Pseudomonas aureginosa and Staphylococcus aureus as 92.48% and 98.56% at 50 mg/L concentration, respectively
Bildungsroman Tradition in English Literature
Full text linkThis book tries to reveal the unique characteristics of the English bildungsroman and to examine the change of the English bildungsroman tradition in three centuries by analysing these characteristics in Daniel Defoe’s "Moll Flanders" of the eighteenth century, George Eliot’s "The Mill on the Floss" of the nineteenth century, and James Joyce’s "A Portrait of the Artist as a Young Man" of the twentieth century
Bazı Yerli Ve Yabancı Zeytinyağlarının Biyoaktif Özellikleri
Full text linkNutrition profile is critical for a healthy life. In particular, some components in certain foods
can directly affect human health by showing biological activity (bioactive) in the body. In this
context, extra virgin olive oil is a food that has recently gained importance due to its positive
effects on health. In this study, phenolic compound profiles (oleuropein, hydroxytyrosol,
tyrosol, catechin, pinoresinol, luteolin, apigenin, caffeic acid, vanillic acid, t-ferulic acid, and
p-coumaric acid), total phenolic content (TFC) and total antioxidant capacity (TAC) of 5
different extra virgin olive oils obtained from different olive varieties (Domat, Uslu, Arbequina,
Taggiasca, Koroneiki) were investigated. The amounts of the individual phenolic compound in
the oil samples were determined by a high-pressure liquid chromatography system (HPLC),
while TFC and TAC were determined by using spectrophotometric methods. Hydroxytyrosol,
as the major phenolic compound, was found at the highest content (129.375 mg/kg) in
Koroneiki olive oil, whereas its lowest (14.485 mg/kg) content was found in Domat olive oil
(P<0.05). Koroneiki olive oil also showed the highest content for tyrosol, while Uslu and
Arbequina olive oils had the lowest contents for this compound (P<0.05). For pinoresinol, the
maximum contents were found in Domat (16,817 mg/kg) and Koroneiki (15,160 mg/kg)
samples, whereas the Uslu oils (5,260 mg/kg) exhibited the minimum content. Phenolic acids
were found at minor levels in all samples. According to the spectrophotometric results, although
the TFC level in Koroneiki olive oil was the highest (294.822 mg gallic acid equivalent
(GAE)/kg), this value was not statistically different from the values in Domat (259.950 mg
GAE/kg) and Uslu (284.267 mg GAE/kg) oils (P>0.05). Similarly, the difference between the
TFC of Arbequina (208.962 mg GAE/kg) and Taggiasca (219.526 mg GAE/kg) oils were not
significant (P>0.05). The results of TAC demonstrated that Koroneiki oil showed the highest
(110.396 mg trolox equivalent (TE)/kg) value for antioksidan aktivity, while Taggiasca oil
showed the lowest (58.465 mg TE/kg) value (P<0.05). The results of this study show that the
investigated bioactive properties can be used as a distinguishing feature for olive oil from
different olive varieties