Lapseki Meslek Yüksekokulu Koleksiyonu

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https://hdl.handle.net/20.500.12428/3546

Listeleniyor 1 - 20 / 118

A comprehensive investigation of PtNPs/PEI N-GQDs nanocomposite: DFT modeling, anticancer activity, and biosensing applications
(Springer, 2025) Altınok Güneş, Buket; Kırlangıç, Ömer Faruk; Kılıç, Murat; Ketenoğlu, Didem; Aslan, Ayşenur; Kabaş, Sultan Yağmur; Kabaş, Afşar; Kaya, İsmet; Yıldız, Mustafa
This research focuses on the synthesis and characterization of a novel nanocomposite, PtNPs/PEI N-GQDs, utilizing FTIR, UV-Vis, SEM, TEM, XPS, and XRD techniques. The study investigates the cytotoxic, apoptotic, and antiangiogenic effects of the nanocomposite on OVCAR-3 cells, aiming to understand the interplay between nanomaterials and cancer. Additionally, the electrochemical properties of PtNPs/PEI N-GQDs-modified glassy carbon electrodes (GCE) are explored, emphasizing analyses of HOMO-LUMO energy levels and band gap energy. Density Functional Theory (DFT) analysis results further support these findings by providing insights into the electronic structure and energetics of the nanocomposite. The nanocomposite exhibits promising electrochemical behavior, demonstrating high capacitance and sensitivity in glucose detection through cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. Selectivity towards glucose among interfering bioanalytes is highlighted, showcasing potential applications in tumor monitoring and diagnosis. Furthermore, the nanocomposite displays significant toxicity against cancer cells, inducing apoptosis and cell cycle arrest. Antiangiogenic effects are also observed, suggesting potential therapeutic benefits. Overall, these findings underscore the multifunctional properties of the synthesized nanocomposite, offering insights into its potential for cancer therapy and biosensor applications for glucose detection in bodily fluids.
Application of a novel anthracene derivative polymer for sensitive voltammetric determination of chloramphenicol in pharmaceutical and food samples
(Pergamon-Elsevier Science Ltd, 2025) Karakaya, Serkan; Kaya, İsmet; Kolcu, Feyza; Dilgin, Yusuf
The application of new polymers for the preparation of modified electrodes is an interesting research area, which is highly significant in the electrochemical antibiotic drug sensors for food safety and environmental sides. Herein, we successfully report the synthesis of a new anthracene-based monomer (N1, N4-bis(anthracene-9-ylmethylene)-2,5-dichlorobenzene-1,4-diamine (ADCA) and Poly(ADCA) modified carbon-based electrode has been used in sensitive and selective differential pulse voltammetric determination of chloramphenicol (CPNL) for the first time. In this platform, the proposed monomer was successfully electro-polymerized onto a cheap, lowcost, and disposable pencil graphite electrode (PGE). The cyclic and differential pulse voltammetric experiments proved that the polymer-modified electrode Poly(ADCA)/PGE) has great electrocatalytic efficiency on the reduction of CPNL. The proposed platform shows a comparable performance in terms of wide linear ranges (2.0-100 and 100-1000 mu M), a low detection limit (0.55 mu M) and high sensitivity (11405 mu A mM- 1 cm- 2) by differential pulse voltammetry (DPV). Additionally, the Poly(ADCA)/PGE exhibited high selectivity and antiinterference facilities for the CPNL. The fabricated sensor showed a promising potential for the determination of CPNL in food (honey, and milk), bottled water, and pharmaceutical (eye ointment) samples with acceptable accuracies and precisions.
Synthesis and characterization of fluorescent and thermally stable poly (azomethine-ether)s: Optical and morphological properties
(Elsevier Sci Ltd, 2025) Tezel, Ruhiye Nilay; Kaya, İsmet
In this work, we described the synthesis and characterization of dialdehyde monomers and poly(azomethineether)s based on them. In the first stage, aromatic bridged dialdehyde monomers were synthesized using 2,4Bis(chloromethyl)-1,3,5-trimethylbenzenedihalide with three different aldehydes (4-hydroxybenzaldehyde, 3methoxy-4-hydroxybenzaldehyde, and 3-ethoxy-4-hydroxybenzaldehyde). Subsequently, corresponding poly (azomethine-ether) derivatives were synthesized through the polycondensation reaction of synthesized dialdehyde monomers with o-toluidine and o-dianisidine diamine compounds. The structures of the obtained dialdehyde and poly(azomethine-ether)s were confirmed by FT-IR, UV-Vis and NMR measurements. The physicochemical properties of the as-prepared poly(azomethine-ether)s have been confirmed through X-ray diffraction (X-RD), field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray analysis (EDX) spectroscopic techniques. In FT-IR, -CH--N- peak around at 1625 cm-1 attributed to the successful conversion of dialdehydes and diamines into poly(azomethine-ether). The semicrystalline nature of the poly (azomethine-ether)s was shown through the X-RD diffractometer. The optical band gaps were found to be in the range of 2.80-2.92 eV, as measured by UV/Vis analysis. These poly(azomethine-ether)s exhibit direct band gap values in the blue/violet region of visible light, which creates opportunities for future studies related to daylight optoelectronic devices. Additionally, thermal behavior was analyzed using TGA and DSC, revealing that the materials are highly stable and rigid.
Assessment of Soil Contamination by Potentially Toxic Elements Around Fertilizer Factory: An Ecological and Health Risks in Bandırma, NW Turkiye
(Taylor & Francis Ltd, 2025) Parlak, Mehmet; Dengiz, Orhan
Soil pollution is a major global concern, with a worrisome escalation in its prevalence being observed on a daily basis. This phenomenon is influenced by a range of factors, including geogenic and anthropogenic processes. The release of potentially toxic elements (PTEs) from fertilizer factories, which are anthropogenic sources, has the potential to cause soil pollution in the surrounding area. The present study investigates the physicochemical properties, PTEs concentrations, contamination characteristics, potential sources, and human health risks of soil samples collected from the vicinity of the Band & imath;rma fertiliser factory. The soil samples exhibited a range of textures, including sandy clay loam, sandy loam, clay loam, loam, and loamy sand. The mean pH, electrical conductivity (EC), lime, and organic matter contents of the soil samples were found to be 6.89, 0.31 dSm-1, 4.82%, and 5.08%, respectively. Furthermore, the concentrations of the PTEs (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn heavy metals) analysed in the soil samples were determined to be between 0.02 and 0.99 mg kg-1, 0.55 and 24.74 mg kg-1, and 0.31 and 34 mg kg-1, respectively. 66 mg kg-1, 4.48 to 423.91 mg kg-1, 2638.61 to 61801.18 mg kg-1, 86.30 to 772.89 mg kg-1, 1.45 to 118.43 mg kg-1, 3.76 to 53.31 mg kg-1, 10.30 to 159.33 mg kg-1, respectively. The enrichment factor indicated that over half of the soils exhibited contamination with Cd and Cu, attributable to industrial activities and the use of agrochemicals. In a similar way, the geo-accumulation index demonstrated that 90.63% of the soils were contaminated with Cu, with all samples also exhibiting contamination with Mn and Zn, and 59.37% with Ni. The ecological risk factor further delineated 9.37% of the soils as exhibiting a considerable degree of risk with regard to Cd, while 3.12% were deemed to present a notable risk with respect to Cu. Of the nine PTEs present in the soil, eight (Cd, Co, Cr, Fe, Mn, Ni, Pb, and Zn) were of natural origin, while Cu was of mixed origin. The THI (total hazard index) values were found to be less than 1 for both children and adults. This finding indicates that there is an absence of non-carcinogenic health risks for both children and adult residents. In addition, the total carcinogenic risk (TCR) values indicated that, with the exception of Cr, there were no carcinogenic risks for children or adults.
Exploring the moderating role of university environmental performance in shaping students' environmental awareness and behaviors
(Emerald Group Publishing Ltd, 2025) Eroğlu, Erdal; Aydemir Dev, Mine; Dalgın, Kübra
PurposeThe purpose of this study is to examine the moderating role of university environmental performance in the relationship between students' environmental awareness and behavior, with a particular focus on the imperative for universities to adopt comprehensive sustainability frameworks. Design/methodology/approachUsing a quantitative research methodology, the study administered a survey to 775 undergraduate students from diverse academic departments at a public university. The survey aimed to assess students' environmental awareness, behaviors and perceptions of university environmental performance. The Mann-Whitney U test, Wilcoxon signed-rank test and Friedman test were applied, and a simple moderation analysis was performed.FindingsThe results indicate that environmental awareness significantly influences students' environmental behaviors. Crucially, the perception of environmental performance moderates the relationship between environmental awareness and behavior. The relationship between environmental awareness and environmental behaviors becomes stronger when environmental performance increases.Research limitations/implicationsWhile the scope of this research is limited to a single institution, potentially limiting the generalizability of the findings, future studies could extend this investigation to multiple universities to confirm and expand upon these results.Originality/valueThis research contributes to the existing body of literature by emphasizing the critical role universities play in cultivating students' environmental awareness and behaviors, and it underscores the importance of institutional environmental performance in promoting sustainable practices within academic environments. Although previous research has explored environmental awareness and behavior, this study offers a unique contribution as it establishes a connection between the awareness-behavior gap and environmental performance.
Environmental and Ecological Risks Posed by Sediment Heavy Metals in Reservoirs: A Preliminary Study from Northwest Türkiye
(Ankara Univ, Fac Agriculture, 2025) Tekiner, Murat; Tuncay, Tulay; Parlak, Mehmet
Reservoir sediments are an important component of aquatic ecosystems. Concentrations, sources, pollution and ecological risks of heavy metals pose serious risks on sustainable management of these ecosystems. This research focuses on heavy metal contents, physicochemical properties, environmental and ecological risks of sediments in four reservoirs (Ayvacık, Bayramdere, Bayramiç, and Umurbey) in Northwest Türkiye. Bayramiç reservoir had greater sediment Al, Cu, Fe, Mn concentrations, clay and silt contents than the other reservoirs (Ayvacık, Bayramdere, and Umurbey). In all four reservoirs, sediment heavy metals were generally of natural origin. Although sediment pollution index was identified as “considerable contamination” for Mn, such a case was not detected for the other heavy metals (Cd, Co, Cr, Cu, Fe, Ni, Pb, and Zn). An ecological risk assessment was made for reservoir sediments and a “low contamination” was detected.
Determination of Genome Size Differentiation and Ploidy Levels in Some Citrus Rootstock Populations
(Kahramanmaraş Sütçü İmam Üniversitesi, 2025) Polatöz, Sefa; Şeker, Murat; Kaya, Çağlar
Determining the ploidy level of plant material used in breeding studies is of great importance, especially for biotechnology applications. The existing genetic diversity in citrus allows the use of rootstocks and varieties that can be adapted to different climatic and soil conditions through different breeding methods. Several suitable rootstocks are used for commercial citrus. This study was conducted to determine the genome size and ploidy levels of citrus rootstocks widely used worldwide using flow cytometry. The rootstocks used in the study included Gou-Tou, C-35, Troyer citrus, Taiwanica, Citremon, Yuzu, Sunki mandarin, Flying Dragon, Yuma citrus, Macrophylla and Chinese orange. Fresh leaf tissue from each rootstock was mixed with triploid Tahitian lemon leaf tissue, used as a standard species, and cell nuclei were isolated. The cells stained with propidium iodide were analysed by flow cytometry, and histograms and cytograms were obtained. According to the results, although all species had diploid genome sizes, differences were observed between species in terms of genome volume. Yuzu seedlings were found to have the largest genome size (0.808 pg/2C), while Flying Dragon trifoliate had the smallest genome size (0.700 pg/2C).
Assessing the Aromatic and Quality Components of a Novel Peach Genotype ('Sırrı') Grafted onto Various Rootstocks in the Lapseki Area
(MDPI, 2025) Gür, Engin; Gündoğdu, Mehmet Ali; Yılmaz, Neşe; Şeker, Murat
This study examines how various rootstocks affect the pomological, biochemical, and aroma contents of the local ‘Sırrı’ peach genotype grown in the Lapseki region of Türkiye. The research focused on peach trees grafted onto three distinct rootstocks: ‘Seedling’, ‘GF-677’ (P. persica × P. amygdalus), and ‘Rootpac-R’ (P. cerasifera × P. amygdalus). The results showed that peaches from the ‘Seedling’ and ‘GF-677’ rootstocks had larger sizes, greater weights, and brighter colors compared to those from ‘Rootpac-R’. Furthermore, the rootstocks impacted essential quality factors such as soluble solid content, firmness, fruit–flesh ratio, titratable acidity, and total phenolic content levels. The analysis of volatile compounds indicated that aldehydes (which varied from 67.02% to 63.74%), lactones (which changed from 9.14% to 7.99%), and esters (which changed from 12.51% to 11.92%) were the major aroma types in ‘Sırrı’ peaches, with the ‘GF-677’ rootstock exhibiting amplified fruity and sweet aromas due to increased lactone levels. Principal Component Analysis (PCA) revealed the significant effects of rootstocks on both pomological and biochemical characteristics, with ‘Seedling’ showing elevated biophenol levels and ‘GF-677’ contributing to a firmer texture. These findings underscore the importance of rootstock choice in enhancing fruit quality and aroma, indicating that the ‘Sırrı’ genotype is highly suitable for commercial production and future breeding efforts.
Effects of Drip Irrigations with Different Irrigation Intervals and Levels on Nutritional Traits of Paddy Cultivars
(MDPI, 2025) Çiftci, Beyza; Kardeş, Yusuf Murat; Varol, İhsan Serkan; Taş, İsmail; Akçura, Sevim; Coşkun, Yalçın; Karaman, Kevser; Akçura, Mevlüt
Rice serves as the primary food source for the majority of the world's population. In terms of irrigation water, the highest volume of irrigation water is utilized in paddy irrigation. Excessive water use causes both waste of limited water resources and various environmental problems. The drip irrigation method with high water use efficiency will reduce both the need for irrigation water and the environmental footprint of paddy production. This study was conducted to investigate the effects of two different irrigation intervals (2 and 4 days) and four irrigation levels (150%, 125%, 100%, and 75% of evaporation from a Class-A pan) on the nutritional traits of three different paddy cultivars (Ronaldo, Baldo, and Osmanc & imath;k). Increasing irrigation intervals and decreasing irrigation levels reduced the nutritional properties (protein, oil, starch) of the rice grains. In addition, increasing irrigation levels also increased the phytic acid and dietary fiber contents. The highest protein (7.14%) and total starch (87.10%) contents were obtained from the 150% irrigation treatments. The highest amylose content (20.74%) was obtained from the 75% irrigation treatment. In general, it was found that irrigation levels should be applied at 125% and 150% to increase the mineral content of rice grains. Although water deficits decreased the nutritional properties of the paddy cultivars, drip irrigation at an appropriate level did not have any negative effects on nutritional traits.
Cyber security policies in Türkiye
(Nova Science Publishers, Inc., 2024) Avaner, Tekin; Fedai, Recep
In this study, activities carried out for information security in the world and in Türkiye within the framework of information security policy will be discussed. The importance of information security policy has increased even more after cyber-attacks around the world. In this context, the study will include various cyber-attacks, and the measures taken against cybersecurity attacks will be analyzed through an information security policy. The ENISA reports prepared within the framework of the European Union's cyber security policy will be included, and the actors and their activities involved in the construction process of Türkiye's national information security policy will be evaluated. The cyber-attacks experienced in Türkiye will also be touched upon, and the mechanisms developed, official policy documents, and the activities of the actors will be analyzed. The main problem encountered in this context will be the various difficulties in the construction of the national information security policy. The solution to the problem is to focus on which mechanisms the state, which is at the center of the information security policy process, has developed structurally and functionally. In this regard, elements of the management process come to the fore. An information security management system consists of steps such as planning, implementation, control, and taking precautions.
Reducing respiration rate and increasing chemical stability of mulberry fruits by using postharvest putrescine and melatonin
(BioMed Central Ltd, 2025) Eyduran, Şadiye Peral; Çolak, Ayşen Melda; Kuru Berk, Selma; Sakaldaş, Mustafa; Şen, Fatih; Gündoğdu, Muttalip
Background: Plant growth regulators have been widely used to extend the cold storage period of fruits and preserve quality. These phytohormones help mulberry fruit in maintaining its postharvest quality and soft texture, prevent from spoiling during cold. For this purpose, mulberry fruit were stored in cold for 5, 10 and 15 day (0.5 °C and 90% RH) and the impacts of melatonin (1.0 mM) and putrescine (1.0 mM) on quality parameters, phenolic compounds (gallic, protocatechuic, catechin, syringic, p-coumaric, chlorogenic, o-coumaric, ferulic, phloridzin, rutin and quercetin) and organic acids (malic, citric, succinic, oxalic, tartaric, fumaric and ascorbic) were investigated. Results: The combined application of putrescine and melatonin maintained the weight loss (4.35%), decay rate (9.48%) and 29.89% lower respiration rate (6.07 mg CO2 kg− 1 h− 1) in mulberry fruits stored for 15 d as compared to the control. Phenolic compounds (especially rutin) and organic acids were found to be more affected by melatonin and putrescine applications compared to other findings in this study. However, melatonin treatment is more effective in maintaining the level of organic acids and phenolic compounds in mulberry fruit during storage than the putrescine. It was determined that soluble solids content, weight loss, decay rate and pH values had a positive relationship with each other. Also, it was also seen that phenolic compounds and organic acids had a linear relationship. Conclusion: The combined application of melatonin and putrescine was found more effective in maintaining the quality parameters of mulberry fruits during cold storage.
Air quality suitability map of Çanakkale urban area (CBS based): ımportance of green spaces
(Springer Nature, 2025) Alkan, Yavuz
Çanakkale is a city with increasing population linked to uncontrolled internal and external migration due to its historical structure and geopolitical situation. Developments in the physical and social structure of the city kept the design of a suspension bridge, which was considered necessary to be built across the Çanakkale Straits (Dardanelles) since the 1990s, alive until 1917. The traffic, industrialization, uncontrolled housing and inadequate environmental planning expected with the opening of the 1915 Çanakkale Bridge, with construction beginning in 2017 and planned for completion in 2022, have recently led to Çanakkale being investigated in terms of air pollution, especially. In this study, emerging as unique at this point, the atmospheric component potential was researched within the scope of 4 counties in Çanakkale province. Air quality maps were obtained for Çanakkale by analyzing the atmospheric component (CO, SO2, NO2, NOX and particulate matter) amounts for July and August of 2021 with GIS modelling. According to the suitability mapping, the Central, Lapseki and Çan regions, with nearly 653.41 km2 area, had suitable air quality, while Biga region with 1043.8 km2 area was not suitable. In conclusion, the study includes strategy development, action plans and recommendations like tax implementations and green space planning for priority preservation and optimization of air quality with the aim of sustainable urban development.
Preparation of composite hydrogels containing fly ash as low-cost adsorbent material and its use in dye adsorption
(Springer Science and Business Media Deutschland GmbH, 2022) Önder, Alper; Ilgın, Pınar; Özay, Hava; Özay, Özgür
Abstract: Recycling industrial wastes is necessary for the economy and the environment. Additionally, it is important to develop high-efficiency adsorbents to prevent severe water pollution caused by wastewater containing dye agents. Here, poly(2-acrylamido-2-methylpropane sulfonic acid)-fly ash composite hydrogel was synthesized with a variety of fly ash proportions with the radical polymerization method. The synthesized composite hydrogel was used for adsorption of methylene blue and methyl orange dyes from water containing dye agents. A variety of parameters such as initial dye concentration, solution pH, anion effects, temperature, contact time and adsorbent amount were investigated for optimization of the adsorption process. The poly(2-acrylamido-2-methylpropane sulfonic acid)-fly ash composite hydrogel was determined to be an effective adsorbent to remove both the cationic dye methylene blue (1438.68 mg g−1) and the anionic dye methyl orange (646.54 mg g−1). Experimental adsorption data were assessed with a variety of isotherm and kinetic models. It was determined that the adsorption of both dye molecules abided by the pseudo-second-order kinetic model. The thermodynamic parameters were determined as ΔH° = − 15.77 ± 5.22 kJ mol−1, ΔS = − 45.05 ± 16.42 J mol−1 K−1 and ΔG° < 0 for MB, ΔH° = − 20.13 ± 4.83 kJ mol−1, ΔS = − 72.87 ± 15.20 J mol−1 K−1 and ΔG° > 0 for MO. In conclusion, a material was synthesized that can be used as a single adsorbent composite material for both anionic and cationic dyes. In addition to the perfect adsorption capacity of this material, it offers reusability and a broad area of application for a variety of dye agents.
Green synthesis of multifunctional responsive hydrogel embedded with silver, based on xanthan gum, N-isopropylacrylamide, vinyl imidazole, and Luffa cylindrica for wound healing
(Taylor & Francis Inc, 2024) Atlı, İlknur; Ilgın, Pınar; Özay, Özgür
In this study, a pH- and temperature-responsive smart hydrogel was developed by utilizing Xanthan Gum (XG), N-Isopropylacrylamide (NIPAM), Vinyl Imidazole (VI), and Luffa cylindrical (LC). Semi-interpenetrating polymer networks (semi-IPNs) were created using free radical polymerization with N,N '-methylenebisacrylamide (MBA) as the cross-linker and ammonium persulfate (APS) as the initiator. Silver nanoparticles (AgNPs) were synthesized within semi-IPN hydrogel network structures to impart antibacterial properties. Malva sylvestris (MS) aqueous leaf extract was used as a reducing and stabilizing agent for the green synthesis of the AgNPs. The semi-IPN hydrogels exhibited pH- and temperature-responsive swelling behavior, which also enabled the controlled release of the drug. After 11 h, the cumulative release reached approximately 73% at pH 7.2 and 87% at pH 8.3. Additionally, the sustained release mechanism of the Trimethoprim drug was described using the Korsmeyer-Peppas model and was governed by Fickian diffusion. The drug-loaded semi-IPN@Ag nanocomposite hydrogel has demonstrated effective antibacterial activity against various Gram-negative and Gram-positive bacteria, indicating its promising potential as a wound dressing material for reducing infection risk.
Poly(azomethine-epoxy-ether) containing phenyl and etoxy moieties:synthesis, characterization and fluorescence property (vol 72, pg 2821, 2018)
(Springer International Publishing Ag, 2020) Kolcu, Feyza; Kaya, İsmet
[Anstract Not Available]
Synthesis and characterization of conjugated polyphenols derived from azomethine formation containing terephtaldehyde via oxidative polycondensation
(Taylor & Francis Inc, 2016) Kolcu, Feyza; Kaya, İsmet
Preparation of conjugated aromatic polyimines, containing phenols in the backbone and side group substitutions, has been successfully achieved by a chemical oxidative polycondensation of a series of Schiff bases using NaOCl as the oxidant at optimum reaction temperature of 90 degrees C. The molecular structures of synthesized compounds were verified by the FT-IR, UV-Vis, H-1-NMR and C-13-NMR techniques. Using thermogravimetric analysis-differential thermal analysis (TG-DTA) and size exclusion chromatography (SEC), the molecular weight distribution parameters and the characterization of all compounds could be specified. The initial degradation temperatures of the polymers were found in the range of 170-271 degrees C. DSC analyses of the polyazomethines (PAMs) were carried out to assign the glass transition temperatures (T-g). UV-Vis measurements gave information about the optical (E-g) band gaps. Fluorescence measurements were carried out to obtain the maximum PL intensities. The spectral analysis outcome signified a blue and a green light emission behavior when irradiated at different wavelengths. Cyclic Voltammetry (CV) was an effective method to explore the HOMO and LUMO energy levels and electrochemical (E-g') band gaps of the polymers. The HOMO energy levels of the synthesized polyimines were lower than those of the monomers indicating the more conjugated structures of the polymers. Four-point collinear probe was used to determine the electrical conductivities of both doped and undoped states of the synthesized polymers with respect to doping time with iodine. The morphological properties of the polymers were illustrated using Scanning Electron Microscopy (SEM) images at different amplifications.
Seasonal population fluctuation and life history in different temperatures of Myzus cerasi (Hemiptera: Aphididae) on cherry trees: a field and laboratory study
(Oxford Univ Press Inc, 2024) Kök, Şahin; Kasap, İsmail
This study determined the seasonal population fluctuation of Myzus cerasi (Fabricius) (Hemiptera: Aphididae) in cherry orchards and the effect of different temperatures on the life-history parameters of these aphids under laboratory conditions. Our field results showed that the population fluctuations and densities of M. cerasi on cherry trees were positively affected by the temperature increase between seasons. Also, our laboratory results showed that M. cerasi survived and reproduced at all temperatures tested under laboratory conditions. Female longevity was observed as 19.00 +/- 2.38, 18.72 +/- 0.49, and 12.59 +/- 0.74 days, and fecundity was 10.14 +/- 2.26, 9.36 +/- 0.59, and 7.27 +/- 0.84 offspring/female at 20, 25, and 30 degrees C, respectively. Although the highest net reproductive rate (R0) was observed numerically at 25 degrees C (7.80 offspring/female), there was no significant difference compared to 20 degrees C (7.10 offspring/female). The highest intrinsic rate of increase (r) and the highest finite rate of increase (lambda) were calculated at 30 degrees C (0.15 +/- 0.01 and 1.16 +/- 0.01 day-1, respectively), and there was no significant difference compared to 25 degrees C. The mean generation time (T) of M. cerasi showed a significant difference at all temperatures tested and decreased from 22.59 +/- 0.33 days at 20 degrees C to 12.78 +/- 0.37 days at 30 degrees C. Consequently, our results revealed that the seasonal population fluctuation and the life history of M. cerasi in the field and laboratory conditions were affected significantly by different temperatures. Our data obtained in the field and the laboratory will contribute to the understanding of M. cerasi biology and to the management of the pest.
Eco-Friendly Preparation of Pectin-Stabilized Ruthenium Catalyst for Hydrogen Generation from Sodium Borohydride Hydrolysis
(Wiley-V C H Verlag Gmbh, 2024) Ilgın, Pınar; Özay, Hava; Özay, Özgür
In this study, we report that pectin-supported ruthenium nanoparticles (pectin@Ru0) can be easily prepared at room temperature by a simple and effective method and that they exhibit outstanding catalytic activity in the hydrolysis of sodium borohydride (NaBH4). The structure, oxidation state, morphology, and thermal studies were analyzed using XRD, XPS, SEM, TEM and TGA analysis. The kinetic performance of pectin@Ru0 biocatalyst was evaluated depending on ruthenium loading, NaBH4 concentration, NaOH concentration, temperature, reusability and storage. The pectin@Ru0 biocatalyst containing 2 wt.% Ru0 metal catalyzed the hydrolysis of 50 mM NaBH4+1 wt.% NaOH with 100 % yield. The activation energy (Ea) and the TOF values of the reaction was estimated as 54.7 kJ mol-1 and 53.1 mol H2 (mol Ru0 min) -1 at 30 degrees C and this is consistent with other previously reported catalysts, making it a remarkable result in comparison. Reusability and catalytic life studies reported that pectin@Ru0 biocatalyst is also highly active and relatively long-lived catalyst in the hydrolysis of NaBH4 in a slightly basic solution. Pectin@Ru0 biocatalyst was successfully synthesized and tested for H2 production in catalytic hydrolysis of NaBH4. HGR and TOF were calculated as 12848 mL/(min.g) and 53.1 mol H2/(mol Ru0 min) at 30 degrees C. Ea was calculated as 54.7 kJ/mol. The reusability of this new catalyst was tested 10 times with 81.5 % stability and 100 % conversion. Storage of biocatalyst can retain 87 % of initial HGR after 30 days. image
Investigation of the synergistic effect of two predatory mites, Phytoseiulus persimilis and Amblyseius swirskii (Acari: Phytoseiidae), in the biological control of Tetranychus urticae (Acari: Tetranychidae)
(Taylor & Francis Inc, 2024) Yaşar, İpek; Kök, Şahin; Kasap, İsmail
Tetranychus urticae (Acari: Tetranychidae) is a polyphagous pest that causes significant economic losses in multiple crop plants. Controlling T. urticae often involves intensive acaricide applications. The use of acaricides also significantly affects human health and ecosystem diversity due to residues and toxic effects in agricultural products. In this study, the efficacy of two predatory mites, Phytoseiulus persimilis and Amblyseius swirskii (Acari: Phytoseiidae), was determined against T. urticae when released as single species and when both species were released together on tomato plants under greenhouse conditions during autumn 2022. The study found that the highest T. urticae density per leaf, with 40.88 +/- 0.79 individuals (eggs + motile) in the control group, was reached at the eighth week. In the same week, the highest impact on T. urticae, with 7.57 +/- 0.42 individuals (eggs + motile), was observed in the treatment group where P. persimilis + A. swirskii were used together, compared to the untreated. According to the current results, the combined use of two predatory species (P. persimilis and A. swirskii) has been found to significantly suppress the population of T. urticae.
Polymerization of Chrysoidine with chemical and enzymatic oxidative preference: Synthesis, characterization, and spectroscopic study
(Wiley, 2018) Kaya, İsmet; Kolcu, Feyza
Chrysoidine (CHRY) is a type of azo-dye extensively used in industry. This study delineates 2 routes as enzymatically and oxidatively polycondensation of chrysoidine for the syntheses of poly (chry-enz) and poly (chry-ox), respectively. The molecular structures of enzymatically and oxidatively polymerized chrysoidine were described by the FT-IR, UV-Vis, H-1-NMR, and C-13-NMR techniques. The molecular structures were obtained to be different as in the cyclization process of the enzymatic polymerization. Solvatochromic behavior in selected polar solvents on the optical properties of poly (chry-ox) were studied. Further characterization was implemented by fluorescence (PL), electrochemical, thermogravimetric (TG-DTA), cyclic voltammetry (CV), and differential scanning calorimetry (DSC) measurements. The number of average molecular weight of poly(chry-ox) was found to be higher than that of poly(chry-enz). Photoluminescence (PL) measurements enlightened the response of poly (chry-ox) with intense light emissions upon a bicolor irradiation by Ultra-Violet and visible light. CV technique was utilized to make a comment about HOMO-LUMO energy levels and electrochemical (Eg') band gaps of the polymers. Optical and electrochemical band gaps of poly (chry-enz) were lower than those of poly (chry-ox), proving the successful synthesis of -conjugated structure of poly (chry-enz). To further make comments about the features of the polymers, scanning electron microscopy (SEM) images were exemplified to study the surface forms of the polymers. Surface morphology of poly (chry-enz) was seen as agglomerates of grains toward the out-of-plane direction. As the polymerization method was changed, the morphology was transformed into a flat-smooth surface present with visible holes for poly (chry-ox).

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