Browsing B6 – LU institūti un aģentūras / Institutes and agencies of the UL by Author "Ogurcovs, Andrejs"
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Assessment of Oxidative Stress by Detection of H2O2 in Rye Samples Using a CuO- and Co3O4-Nanostructure-Based Electrochemical Sensor
Mihailova, Irena; Krasovska, Marina; Sledevskis, Eriks; Gerbreders, Vjaceslavs; Mizers, Valdis; Ogurcovs, Andrejs (MDPI, 2023)Hydrogen peroxide is essential for biological processes and normally occurs in low concentrations in living organisms. However, exposure of plants to biotic and abiotic stressors can disrupt their defense mechanisms, ... -
Effect of DNA Aptamer Concentration on the Conductivity of a Water-Gated Al:ZnO Thin-Film Transistor-Based Biosensor
Ogurcovs, Andrejs; Kadiwala, Kevon; Sledevskis, Eriks; Krasovska, Marina; Plaksenkova, Marina; Butanovs, Edgars (MDPI, 2022)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. ... -
Glyphosate Sensor Based on Nanostructured Water-Gated CuO Field-Effect Transistor
Ogurcovs, Andrejs; Kadiwala, Kevon; Sledevskis, Eriks; Krasovska, Marina; Mizers, Valdis (MDPI, 2022)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 ... -
Non-Enzymatic Co3O4 Nanostructure-Based Electrochemical Sensor for H2O2 Detection
Mizers, V.; Gerbreders, V.; Krasovska, M.; Sledevskis, E.; Mihailova, I.; Ogurcovs, Andrejs; Bulanovs, A.; Gerbreders, Andrejs (Sciendo, 2023)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 ... -
A non-enzymatic electrochemical hydrogen peroxide sensor based on copper oxide nanostructures
Mihailova, Irena; Gerbreders, Vjaceslavs; Krasovska, Marina; Sledevskis, Eriks; Mizers, Valdis; Bulanovs, Andrejs; Ogurcovs, Andrejs (Beilstein-Institut, 2022)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 ... -
Selective Patterned Growth of ZnO Nanoneedle Arrays
Mihailova, I.; Krasovska, M.; Sledevskis, E.; Gerbreders, V.; Mizers, V.; Bulanovs, A.; Ogurcovs, Andrejs (Sciendo, 2023)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 ... -
Target transportation of auxin on mesoporous Au/SiO2 nanoparticles as a method for somaclonal variation increasing in flax (L. usitatissimum L.)
Kokina, Inese; Jahundoviča, Inese; Mickeviča, Ilona; Jermaļonoka, Marija; Strautiņš, Jānis; Popovs, Sergejs; Ogurcovs, Andrejs; Sledevskis, Eriks; Polyakov, Boriss; Gerbreders, Vjačeslavs (Hindawi Limited, 2017)Development of methods for direct delivery of different bioactive substances into the cell is a promising and intensively approached area of research. It has become a subject of serious research for multidisciplinary team ... -
Understanding of conversion process of magnetron deposited thin films of amorphous ReOx to crystalline ReO3 upon thermal annealing
Polyakov, Boris; Butanovs, Edgars; Ogurcovs, Andrejs; Vlassov, Sergei; Zubkins, Martins; Jonane, Inga; Cintins, Arturs; Kalinko, Aleksandr; Kuzmin, Alexei; Purans, Juris (ACS Publications, 2020)Thin films of rhenium trioxide (ReO3) were produced by reactive DC magnetron sputtering from metallic rhenium target followed by annealing in the air in the range of temperatures from 200C to 350C. Nanocrystalline ... -
Unraveling the Structure and Properties of Layered and Mixed ReO3–WO3 Thin Films Deposited by Reactive DC Magnetron Sputtering
Polyakov, Boris; Butanovs, Edgars; Ogurcovs, Andrejs; Sarakovskis, Anatolijs; Zubkins, Martins; Bikse, Liga; Gabrusenoks, Jevgenijs; Vlassov, Sergei; Kuzmin, Alexei; Purans, Juris (American Chemical Society, 2022)Tungsten trioxide (WO3) is a well-known electrochromic material with a wide band gap, while rhenium trioxide (ReO3) is a “covalent metal” with an electrical conductivity comparable to that of pure metals. Since both WO3 ...