23 results on '"Krasovska, M."'
Search Results
2. Selective Patterned Growth of ZnO Nanoneedle Arrays.
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Mihailova, I., Krasovska, M., Sledevskis, E., Gerbreders, V., Mizers, V., Bulanovs, A., and Ogurcovs, A.
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METAL coating , *COATING processes , *LASER beams , *ZINC acetate , *PATTERNMAKING , *ZINC oxide - Abstract
Nanostructured coatings are widely used to improve the sensitivity of various types of sensors by increasing the active surface area compared to smooth films. However, for certain applications (in some cases), it may be necessary to achieve selectivity in the coating process to ensure that nanostructures only form in specific areas leaving interelectrode spaces free of nanostructures. This article discusses several methods for creating intricate ZnO nanostructured patterns, including area selective application of Zn acetate seeds followed by hydrothermal growth, selective thermal decomposition of zinc acetate via laser irradiation followed by hydrothermal growth, and the electrochemical deposition method. These methods enable ZnO nanostructures to grow onto designated surface areas with customised, patterned shapes, and they are rapid, cost-effective, and environmentally benign. The article examines the process of producing a nanostructured coating with a complex shape and discusses several factors that can impact the quality of the final product. These include the influence of the thermocapillary flows and the "coffee stain" effect on the deposition of a seed layer of zinc oxide from an ethanol solution of zinc acetate. Additionally, the study found that using a protective screen during the growth of nanostructures can reduce the occurrence of unintended parasitic structures in areas lacking a seed layer. Overall, the article presents various techniques and strategies to improve the quality of nanostructured coatings. We have proven that the use of laser radiation to create a seed layer does not impact the final morphology of the resulting nanostructures. However, when combined with computer-controlled technology, this approach allows for the creation of intricate patterns made up of micrometre-sized lines which cannot be achieved by using other methods. The article also demonstrates an electrochemical technique for obtaining zinc oxide nano-structures that can selectively coat metal electrodes without requiring a seed layer. [ABSTRACT FROM AUTHOR]
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- 2023
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3. Non-Enzymatic Co3O4 Nanostructure-Based Electrochemical Sensor for H2O2 Detection.
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Mizers, V., Gerbreders, V., Krasovska, M., Sledevskis, E., Mihailova, I., Ogurcovs, A., Bulanovs, A., and Gerbreders, A.
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ELECTROCHEMICAL sensors ,HYDROGEN peroxide ,ELECTROACTIVE substances ,COBALT oxides ,CYCLIC voltammetry ,SCANNING electron microscopy ,HYDROTHERMAL synthesis ,PHOTOVOLTAIC effect - Abstract
This article describes the synthesis of nanostructured cobalt oxide on iron wires and its application for the detection of hydrogen peroxide as working electrode for non-enzymatic electrochemical sensor. Cobalt oxide was obtained by the hydrothermal synthesis method using chloride and acetate anions. The resulting nanostructured coating obtained from the chloride precursor is a uniform homogeneous porous network of long nanofibers assembled into regular honeyсomb-like formations. In the case of an acetate precursor, instead of nanofibers, petal-like nanostructures assembled into honeycomb agglomerates are observed. The structure, surface, and composition of the obtained samples were studied using field-emission scanning electron microscopy along with energy-dispersive spectroscopy and X-ray diffractometry. The resultant nanostructured specimens were utilized to detect H
2 O2 electrochemically through cyclic voltammetry, differential pulse voltammetry, and i-t measurements. A comparative research has demonstrated that the nanostructures produced from the chloride precursor exhibit greater sensitivity to H2 O2 and have a more appropriate morphology for designing a nanostructured sensor. A substantial linear correlation between the peak current and H2 O2 concentration within the 20 to 1300 μM range was established. The Co3 O4 electrode obtained exhibits a sensitivity of 505.11 μA·mM−1 , and the electroactive surface area is calculated to be 4.684 cm2 . Assuming a signal-to-noise ratio of 3, the calculated limit of detection is 1.05 μM. According to the interference study, the prevalent interfering agents, such as ascorbic acid, uric acid, NaCl, and glucose, do not influence the electrochemical reaction. The obtained results confirm that this sensor is suitable for working with complex analytes.The actual sample assessment demonstrated a recovery rate exceeding 95 %. [ABSTRACT FROM AUTHOR]- Published
- 2023
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4. Morphology Influence on Wettability and Wetting Dynamics of ZnO Nanostructure Arrays
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Gerbreders, V., primary, Krasovska, M., additional, Mihailova, I., additional, Sledevskis, E., additional, Ogurcovs, A., additional, Tamanis, E., additional, Auksmuksts, V., additional, Bulanovs, A., additional, and Mizers, V., additional
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- 2022
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5. Metal Oxide Nanostructure-Based Gas Sensor for Carbon Dioxide Detection
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Gerbreders, V., primary, Krasovska, M., additional, Mihailova, I., additional, Kostjukevics, J., additional, Sledevskis, E., additional, Ogurcovs, A., additional, Gerbreders, A., additional, and Bulanovs, A., additional
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- 2021
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6. PROCESSES OF PRIVATIZATION AND DEVELOPMENT OF THE UKRAINIAN ECONOMY
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Zhaldak, H., primary and Krasovska, M., additional
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- 2020
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7. Electrochemical Detection of Small Volumes of Glyphosate with Mass-Produced Non-Modified Gold Chips
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Mizers, V., primary, Gerbreders, V., additional, Sledevskis, E., additional, Kokina, I., additional, Tamanis, E., additional, Krasovska, M., additional, Mihailova, I., additional, Orugcovs, A., additional, and Bulanovs, A., additional
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- 2020
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8. Quantum-chemical calculations of transitional states thermodynamic parameters of tautomers of initial N,N’-disubstituted thiourea derivative during the cyclization reaction in the conditions of different solvents application
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Perekhoda, L. O., primary, Yeromina, H. O., additional, Ieromina, Z. G., additional, Sheykina, N. V., additional, Krasovskyi, I. V., additional, Krasovska, M. V., additional, and Storozhenko, I. P., additional
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- 2019
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9. Доведення регіоселективності перебігу циклізації 1-етил-3-[4-6,7,8,9-тетрагідро-5Н-[1,2,4]триазоло[4,3-а]азепін-3-іл)феніл]тіосечовини з α-бромкетоном
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Perekhoda, L. O., Yeromina, H. O., Storozhenko, I. P., Sheykina, N. V., Krasovskyi, I. V., Krasovska, M. V., and Demchenko, S. A.
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UDC 54.057:547.789:547.79 ,5Н-[1,2,4]триазоло[4,3-а]азепины ,циклизация ,квантово-химические расчеты ,континуум ,энергия активации ,относительная энергия ,программные методы B3LYP / 6-31 + G (d) и M06-2X / 6-31 + G (d) GAUSSIAN W09 ,термодинамические параметры ,седловидная точка ,5Н-[1,2,4]триазоло[4,3-а]азепіни ,циклізація ,квантово-хімічні розрахунки ,енергія активації ,відносна енергія ,програмні методи B3LYP/6-31+G(d) таM06-2X/6-31+G(d) GAUSSIAN W09 ,термодинамічні параметри ,сідлоподібна точка ,5H-[1,2,4]triazolo[4,3-а]azepines ,cyclization ,quantum chemical calculations ,continuum ,activation energy ,relative energy ,B3LYP/6-31+G(d) and M06-2X/6-31+G(d) GAUSSIAN W09 program methods ,thermodynamics parameters ,saddle point ,УДК 54.057:547.789:547.79 - Abstract
An important step in creation of potential drugs is to confirm the structure of the compounds synthesized. This requires the use of modern physical and physico-chemical methods of research. Nowadays a promising scientific direction for searching biologically active substances is the study of 2-R-imino-1,3-thiazoline derivatives.Aim. To study regioselectivity of the cyclization reaction of 1-ethyl-3-[4-(6,7,8,9-tetrahydro-5Н-[1,2,4]triazolo[4,3-а]azepin-3-yl)phenyl]thiourea with 2-bromo-1-phenylethanone. Results. The true structure of the interaction product was determined by the methods of 1H NMR spectroscopy and X-ray analysis. Quantum chemical calculations of the electronic structure, geometry and thermodynamic parameters of the initial thiourea three tautomers were given. Activating energy of tautomer 1A belower than 1B one, the state of 1B has modest lower relative energy, consequently tautomer 1A is more credible state. Thus, the conclusion can be made that the reaction will proceed by 1-1A-3A.Experimental part. Quantum chemical calculations of the electronic structure, geometry and thermodynamic parameters of the initial thiourea three tautomers were determined by the density functional theory (DFT) methods using the GAUSSIAN W09 computer program. The effect of the solvent was considered within the framework of polarized continuum model (PCM). Conclusions. Based on the physico-chemical studies and quantum chemical calculations of the reaction cyclization direction the conclusion has been made that the cyclization reaction of 1-ethyl-3-[4-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-а]azepin-3-yl)phenyl]thiourea 1 with 2-bromo-1-phenylethanone 2 is regioselective, and it leads to formation of more thermodynamically advantageous (stable) isomer 3A., Важным этапом создания потенциальных лекарственных средств является подтверждение структуры синтезированных соединений, что требует использования современных физических и физико-химических методов исследования. На сегодня перспективным научным направлением в плане поиска биологически активных веществ является исследование в ряду производных 2-R-имино-1,3-тиазолина.Целью работы является изучение региоселективности реакции циклизации 1-этил-3-[4-(6,7,8,9-тетрагидро-5Н-[1,2,4]триазоло[4,3-а]азепин-3-ил)фенил]тиомочевины с 2-бром-1-фенилэтаноном.Результаты и их обсуждение. Установление истинного строения продукта взаимодействия осуществлено с помощью методов 1Н ЯМР-спектроскопии и рентгеноструктурного анализа. Приведены квантово-химические расчеты электронной структуры, геометрии и термодинамических параметров трех таутомеров исходной тиомочевины. Энергия активации таутомера 1А несколько ниже, состояние 1В имеет незначительно меньшую относительную энергию, следовательно, таутомер 1А является более вероятным. Таким образом, мы можем сделать вывод, что реакция пойдет по пути 1-1А-3А.Экспериментальная часть. Квантово-химические расчеты электронной структуры, геометрии и термодинамических параметров трех таутомеров исходной тиомочевины вычислены методами теории функционала плотности (DFT) с использованием компьютерной программы GAUSSIAN 09W. Учет влияния растворителя осуществлялся в рамках модели поляризуемого континуума (PCM).Выводы. На основе проведенных физико-химических исследований и квантово-химических расчетов направления прохождения реакции конденсации 1-этил-3-[4-6,7,8,9-тетрагидро-5Н-[1,2,4]триазоло[4,3-а]азепин-3-ил)фенил]тиомочевины с 2-бромо-1-фенилэтаноном сделан вывод о ее региоселективности с образованием более термодинамически выгодного изомера 3А., Важливим етапом створення потенційних лікарських засобів є підтвердження структури синтезованих сполук, що потребує використання сучасних фізичних та фізико-хімічних методів дослідження. На сьогодні перспективним науковим напрямком при пошуку біологічно активних речовин є дослідження в ряду похідних 2-R-іміно-1,3-тіазоліну.Метою роботи є вивчення регіоселективності реакції циклізації 1-етил-3-[4-(6,7,8,9-тетрагідро-5Н-[1,2,4]триазоло[4,3-а]азепін-3-іл)феніл]тіосечовини з 2-бромо-1-фенілетаноном. Результати та їх обговорення. Встановлення істинної будови продукту взаємодії здійснено за допомогою методів 1Н ЯМР-спектроскопії та рентгеноструктурного аналізу. Наведені квантово-хімічні розрахунки електронної структури, геометрії і термодинамічних параметрів трьох таутомерів вихідної тіосечовини. Енергія активації таутомеру 1А дещо нижча, стан 1В має незначно нижчу відносну енергію, отже, таутомер 1А є більш ймовірним. Таким чином, ми можемо зробити висновок, що реакція перебігатиме шляхом 1-1А-3А.Експериментальна частина. Квантово-хімічні розрахунки електронної структури, геометрії і термодинамічних параметрів трьох таутомерів вихідної тіосечовини обчислені методами теорії функціоналу густини (DFT) з використанням комп’ютерної програми GAUSSIAN 09W. Облік впливу розчинника здійснювався в рамках моделі континууму, що поляризується (PCM). Висновки. На основі проведених фізико-хімічних досліджень і квантово-хімічних розрахунків напрямку проходження реакції конденсації 1-етил-3-[4-6,7,8,9-тетрагідро-5Н-[1,2,4]триазоло[4,3-а]азепін-3-іл)феніл]тіосечовини з 2-бромо-1-фенілетаноном зроблений висновок про її регіоселективність з утворенням більш термодинамічно вигідного ізомеру 3А.
- Published
- 2017
10. The presentation of regioselectivity of 1-ethyl-3-[4-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-а]azepin-3-yl)phenyl]thiourea cyclization with α-bromoketone
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Perekhoda, L. O., primary, Yeromina, H. O., additional, Storozhenko, I. P., additional, Sheykina, N. V., additional, Krasovskyi, I. V., additional, Krasovska, M. V., additional, and Demchenko, S. A., additional
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- 2017
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11. The Study of Adsorption Process of Pb Ions Using Well-Aligned Arrays of ZnO Nanotubes as a Sorbent
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Krasovska, M., primary, Gerbreders, V., additional, Tamanis, E., additional, Gerbreders, S., additional, and Bulanovs, A., additional
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- 2017
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12. 13C NMR spectra of 7-substituted 8-mercaptoquinolines
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Zuika, I. V., Popelis, Yu. Yu., Bruvers, Z. P., Sturis, A. P., Leeis, Ya. É., and Krasovska, M. É.
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- 1980
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13. Obtaining a Well-Aligned ZnO Nanotube Array Using the Hydrothermal Growth Method / Labi Sakārtotu Zno Nanocauruļu Kopu Iegūšana, Izmantojot Hidrotermālo Metodi
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Krasovska, M., primary, Gerbreders, V., additional, Paskevics, V., additional, Ogurcovs, A., additional, and Mihailova, I., additional
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- 2015
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14. The genomic HDV ribozyme utilizes a previously unnoticed U-turn motif to accomplish fast site-specific catalysis
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Sefcikova, J., primary, Krasovska, M. V., additional, Sponer, J., additional, and Walter, N. G., additional
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- 2007
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15. 13C NMR spectra of 7-substituted 8-mercaptoquinolines
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Zuika, I., Popelis, Yu., Bruvers, Z., Sturis, A., Leeis, Ya., and Krasovska, M.
- Abstract
Abstract: The
13 C NMR spectra of 7-substituted [7-CH3 , 2,7-(CH3 )2 , 7-Cl, 7-Br, and 7-SCH3 ] 8-mercaptoquinolines and 8-methylmercaptoquinolines were examined. It is shown that the changes in the13 C chemical shifts of the quinoline ring in the spectra of 7-substituted 8-mercaptoquinolines are in good agreement with the additive contribution of the increments of the substituents, i.e., their conjugation with the ring is not disrupted. The conjugation of the SCH3 group with the quinoline ring in 7-substituted 8-methylmercaptoquinolines is disrupted as a consequence of steric hindrance, and this leads to a decrease in the increments of this group. The data obtained are compared with the results of a calculation within the CNDO/2 approximation.- Published
- 1980
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16. ChemInform Abstract: CARBON‐13 NMR SPECTRA OF 7‐DERIVATIVES OF 8‐MERCAPTOQUINOLINE
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ZUIKA, I. V., primary, POPELIS, YU. YU., additional, BRUVERS, Z. P., additional, STURIS, A. P., additional, LEEIS, YA. E., additional, and KRASOVSKA, M. E., additional
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- 1980
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17. Co 3 O 4 Nanostructured Sensor for Electrochemical Detection of H 2 O 2 as a Stress Biomarker in Barley: Fe 3 O 4 Nanoparticles-Mediated Enhancement of Salt Stress Tolerance.
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Gerbreders V, Krasovska M, Sledevskis E, Mihailova I, and Mizers V
- Abstract
This research investigates the enhancement of barley's resistance to salt stress by integrating nanoparticles and employing a nanostructured Co
3 O4 sensor for the electrochemical detection of hydrogen peroxide (H2 O2 ), a crucial indicator of oxidative stress. The novel sensor, featuring petal-shaped Co3 O4 nanostructures, exhibits remarkable precision and sensitivity to H2 O2 in buffer solution, showcasing notable efficacy in complex analytes like plant juice. The research establishes that the introduction of Fe3 O4 nanoparticles significantly improves barley's ability to withstand salt stress, leading to a reduction in detected H2 O2 concentrations, alongside positive impacts on morphological parameters and photosynthesis rates. The developed sensor promises to provide real-time monitoring of barley stress responses, providing valuable information on increasing tolerance to crop stressors.- Published
- 2024
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18. Glyphosate Sensor Based on Nanostructured Water-Gated CuO Field-Effect Transistor.
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Ogurcovs A, Kadiwala K, Sledevskis E, Krasovska M, and Mizers V
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This research presents a comparative analysis of water-gated thin film transistors based on a copper oxide (CuO) semiconductor in the form of a smooth film and a nanostructured surface. A smooth CuO film was deposited through reactive magnetron sputtering followed by annealing in atmosphere at a temperature of 280 ∘C. Copper oxide nanostructures were obtained by hydrothermal synthesis on a preliminary magnetron sputtered 2 nm thick CuO precursor followed by annealing at 280 ∘C. An X-ray diffraction (XRD) analysis of the samples revealed the presence of a tenorite (CuO) phase with a predominant orientation of (002). Scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies of the samples revealed a highly developed surface with crystallites having a monoclinic syngony and dimensions of 15-20 nm in thickness, 150 nm in length, and 100 nm in height relative to a 2.5 nm height for the CuO crystallites of the smooth film. Electric measurements of the studied devices revealed typical current-voltage characteristics of semiconductors with predominant hole conductivity. The maximum ON/OFF ratio at a rain-source voltage of 0.4 volts and -1.2 volts on the gate for a smooth film was 102, and for a nanostructured transistor, it was 103. However, a much stronger saturation of the channel was observed for the nanostructured channel than for the smooth film. A test solution containing glyphosate dissolved in deionized water in three different concentrations of 5, 10, and 15 μmol/L was used during the experiments. The principle of operation was based on the preliminary saturation of the solution with Cu ions, followed by the formation of a metal-organic complex alongside glyphate. The glyphosate contents in the analyte led to a decrease in the conductivity of the transistor on the axis of the smooth film. In turn, the opposite effect was observed on the nanostructured surface, i.e., an increase in conductivity was noted upon the introduction of an analyte. Despite this, the overall sensitivity of the nanostructured device was twice as high as that of the device with a thin film channel. The relative changes in the field-effect transistor (FET) conductivity at maximum glyphosate concentrations of 15 μmol/L reached 19.42% for the nanostructured CuO film and 3.3% for the smooth film.
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- 2022
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19. A non-enzymatic electrochemical hydrogen peroxide sensor based on copper oxide nanostructures.
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Mihailova I, Gerbreders V, Krasovska M, Sledevskis E, Mizers V, Bulanovs A, and Ogurcovs A
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This article describes the synthesis of nanostructured copper oxide on copper wires and its application for the detection of hydrogen peroxide. Copper oxide petal nanostructures were obtained by a one-step hydrothermal oxidation method. The resulting coating is uniform and dense and shows good adhesion to the wire surface. Structure, surface, and composition of the obtained samples were studied using field-emission scanning electron microscopy along with energy-dispersive spectroscopy and X-ray diffractometry. The resulting nanostructured samples were used for electrochemical determination of the H
2 O2 content in a 0.1 M NaOH buffer solution using cyclic voltammetry, differential pulse voltammetry, and i - t measurements. A good linear relationship between the peak current and the concentration of H2 O2 in the range from 10 to 1800 μM was obtained. The sensitivity of the obtained CuO electrode is 439.19 μA·mM-1 . The calculated limit of detection is 1.34 μM, assuming a signal-to-noise ratio of 3. The investigation of the system for sensitivity to interference showed that the most common interfering substances, that is, ascorbic acid, uric acid, dopamine, NaCl, glucose, and acetaminophen, do not affect the electrochemical response. The real milk sample test showed a high recovery rate (more than 95%). According to the obtained results, this sensor is suitable for practical use for the qualitative detection of H2 O2 in real samples, as well as for the quantitative determination of its concentration., (Copyright © 2022, Mihailova et al.)- Published
- 2022
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20. Effect of DNA Aptamer Concentration on the Conductivity of a Water-Gated Al:ZnO Thin-Film Transistor-Based Biosensor.
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Ogurcovs A, Kadiwala K, Sledevskis E, Krasovska M, Plaksenkova I, and Butanovs E
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- Transistors, Electronic, Water, Aptamers, Nucleotide, Biosensing Techniques methods, Zinc Oxide chemistry
- Abstract
Field-effect transistor-based biosensors (bio-FETs) are promising candidates for the rapid high-sensitivity and high-selectivity sensing of various analytes in healthcare, clinical diagnostics, and the food industry. However, bio-FETs still have several unresolved problems that hinder their technological transfer, such as electrical stability. Therefore, it is important to develop reliable, efficient devices and establish facile electrochemical characterization methods. In this work, we have fabricated a flexible biosensor based on an Al:ZnO thin-film transistor (TFT) gated through an aqueous electrolyte on a polyimide substrate. In addition, we demonstrated techniques for establishing the operating range of such devices. The Al:ZnO-based devices with a channel length/width ratio of 12.35 and a channel thickness of 50 nm were produced at room temperature via magnetron sputtering. These Al:ZnO-based devices exhibited high field-effect mobility (μ = 6.85 cm
2 /Vs) and threshold voltage (Vth = 654 mV), thus showing promise for application on temperature-sensitive substrates. X-ray photoelectron spectroscopy was used to verify the chemical composition of the deposited films, while the morphological aspects of the films were assessed using scanning electron and atomic force microscopies. The gate-channel electric capacitance of 40 nF/cm2 was determined using electrochemical impedance spectroscopy, while the electrochemical window of the gate-channel system was determined as 1.8 V (from -0.6 V to +1.2 V) using cyclic voltammetry. A deionized water solution of 10 mer (CCC AAG GTC C) DNA aptamer (molar weight -2972.9 g/mol) in a concentration ranging from 1-1000 pM/μL was used as an analyte. An increase in aptamer concentration caused a proportional decrease in the TFT channel conductivity. The techniques demonstrated in this work can be applied to optimize the operating parameters of various semiconductor materials in order to create a universal detection platform for biosensing applications, such as multi-element FET sensor arrays based on various composition nanostructured films, which use advanced neural network signal processing.- Published
- 2022
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21. Genotoxic Evaluation of Fe 3 O 4 Nanoparticles in Different Three Barley ( Hordeum vulgare L.) Genotypes to Explore the Stress-Resistant Molecules.
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Kokina I, Plaksenkova I, Galek R, Jermaļonoka M, Kirilova E, Gerbreders V, Krasovska M, and Sledevskis E
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- Chlorophyll metabolism, Comet Assay, DNA, Plant, Gene Expression Regulation, Plant drug effects, Hordeum metabolism, Magnetic Iron Oxide Nanoparticles ultrastructure, Plant Development drug effects, Seedlings drug effects, Seedlings growth & development, DNA Damage drug effects, Genotype, Hordeum genetics, Magnetic Iron Oxide Nanoparticles adverse effects, Stress, Physiological
- Abstract
Sustainable agricultural practices are still essential due to soil degradation and crop losses. Recently, the relationship between plants and nanoparticles (NPs) attracted scientists' attention, especially for applications in agricultural production as nanonutrition. Therefore, the present research was carried out to investigate the effect of Fe
3 O4 NPs at low concentrations (0, 1, 10, and 20 mg/L) on three genotypes of barley ( Hordeum vulgare L.) seedlings grown in hydroponic conditions. Significant increases in seedling growth, enhanced chlorophyll quality and quantity, and two miRNA expression levels were observed. Additionally, increased genotoxicity was observed in seedlings grown with NPs. Generally, Fe3 O4 NPs at low concentrations could be successfully used as nanonutrition for increasing barley photosynthetic efficiency with consequently enhanced yield. These results are important for a better understanding of the potential impact of Fe3 O4 NPs at low concentrations in agricultural crops and the potential of these NPs as nanonutrition for barley growth and yield enhancement. Future studies are needed to investigate the effect of these NPs on the expression of resistance-related genes and chlorophyll synthesis-related gene expression in treated barley seedlings.- Published
- 2021
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22. The Impact of Zinc Oxide Nanoparticles on Cytotoxicity, Genotoxicity, and miRNA Expression in Barley ( Hordeum vulgare L.) Seedlings.
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Plaksenkova I, Kokina I, Petrova A, Jermaļonoka M, Gerbreders V, and Krasovska M
- Subjects
- Biomass, DNA Damage drug effects, Gene Expression Regulation, Plant drug effects, Genomic Instability, Germination drug effects, Germination genetics, Humans, Metal Nanoparticles ultrastructure, MicroRNAs genetics, Phenotype, Plant Development drug effects, Plant Development genetics, Stress, Physiological, Hordeum drug effects, Hordeum genetics, Metal Nanoparticles chemistry, Seedlings drug effects, Seedlings genetics, Zinc Oxide chemistry, Zinc Oxide pharmacology
- Abstract
Zinc oxide nanoparticles are one of the most commonly engineered nanomaterials and necessarily enter the environment because of the large quantities produced and their widespread application. Understanding the impacts of nanoparticles on plant growth and development is crucial for the assessment of probable environmental risks to food safety and human health, because plants are a fundamental living component of the ecosystem and the most important source in the human food chain. The objective of this study was to examine the impact of different concentrations of zinc oxide nanoparticles on barley Hordeum vulgare L. seed germination, seedling morphology, root cell viability, stress level, genotoxicity, and expression of miRNAs. The results demonstrate that zinc oxide nanoparticles enhance barley seed germination, shoot/root elongation, and H
2 O2 stress level and decrease root cell viability and genomic template stability and up- and downregulated miRNAs in barley seedlings., Competing Interests: The authors declare that there are no conflicts of interest regarding the publication of this paper., (Copyright © 2020 Ilona Plaksenkova et al.)- Published
- 2020
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23. ZnO-nanostructure-based electrochemical sensor: Effect of nanostructure morphology on the sensing of heavy metal ions.
- Author
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Krasovska M, Gerbreders V, Mihailova I, Ogurcovs A, Sledevskis E, Gerbreders A, and Sarajevs P
- Abstract
ZnO nanostructures are promising candidates for use in sensors, especially in electrochemical sensors and biosensors, due to their unique physical and chemical properties, as well as sensitivity and selectivity to several types of contamination, including heavy metal ions. In this work, using the hydrothermal method, nanostructures of ZnO were synthesized in four different morphologies: nanorods, nanoneedles, nanotubes and nanoplates. To determine the peculiarities of adsorption for each morphology, a series of electrochemical measurements were carried out using these nanostructured ZnO coatings on the working electrodes, using aqueous solutions of Pb(NO
3 )2 and Cd(NO3 )2 as analytes with different concentrations. It was found that the sensitivity of the resulting electrochemical sensors depends on the morphology of the ZnO nanostructures: the best results were achieved in the case of porous nanostructures (nanotubes and nanoplates), whereas the lowest sensitivity corresponded to ZnO nanorods with a large diameter (i.e., low surface-to-volume ratio). The efficiency of sedimentation is also related to the electronegativity of adsorbate: it has been shown that all observed ZnO morphologies exhibited significantly higher sensitivity in detecting lead ions compared to cadmium ions.- Published
- 2018
- Full Text
- View/download PDF
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