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Vorobjova A, Tishkevich D, Shimanovich D, Zdorovets M, Kozlovskiy A, Zubar T, Vinnik D, Dong M, Trukhanov S, Trukhanov A, Fedosyuk V. Electrochemical Behaviour of Ti/Al 2O 3/Ni Nanocomposite Material in Artificial Physiological Solution: Prospects for Biomedical Application. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E173. [PMID: 31963901 PMCID: PMC7022230 DOI: 10.3390/nano10010173] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 01/11/2020] [Accepted: 01/13/2020] [Indexed: 01/07/2023]
Abstract
Inorganic-based nanoelements such as nanoparticles (nanodots), nanopillars and nanowires, which have at least one dimension of 100 nm or less, have been extensively developed for biomedical applications. Furthermore, their properties can be varied by controlling such parameters as element shape, size, surface functionalization, and mutual interactions. In this study, Ni-alumina nanocomposite material was synthesized by the dc-Ni electrodeposition into a porous anodic alumina template (PAAT). The structural, morphological, and corrosion properties were studied using x-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and electrochemical techniques (linear sweep voltammetry). Template technology was used to obtain Ni nanopillars (NiNPs) in the PAAT nanocomposite. Low corrosion current densities (order of 0.5 µA/cm2) were indicators of this nanocomposite adequate corrosion resistance in artificial physiological solution (0.9% NaCl). A porous anodic alumina template is barely exposed to corrosion and performs protective functions in the composite. The results may be useful for the development of new nanocomposite materials technologies for a variety of biomedical applications including catalysis and nanoelectrodes for sensing and fuel cells. They are also applicable for various therapeutic purposes including targeting, diagnosis, magnetic hyperthermia, and drug delivery. Therefore, it is an ambitious task to research the corrosion resistance of these magnetic nanostructures in simulated body fluid.
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Affiliation(s)
- Alla Vorobjova
- Department of Micro- and Nanoelectronics, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus; (A.V.); (D.S.)
| | - Daria Tishkevich
- Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus; (T.Z.); (S.T.); (A.T.); (V.F.)
- Laboratory of Single Crystal Growth, South Ural State University, 454080 Chelyabinsk, Russia;
| | - Dmitriy Shimanovich
- Department of Micro- and Nanoelectronics, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus; (A.V.); (D.S.)
| | - Maxim Zdorovets
- The Institute of Nuclear Physics, Almaty 050032, Kazakhstan; (M.Z.); (A.K.)
- L.N. Gumilyov Eurasian National University, Nur-Sultan 010008, Kazakhstan
- Ural Federal University named after the First President of Russia B.N. Yeltsin, 620075 Yekaterinburg, Russia
| | - Artem Kozlovskiy
- The Institute of Nuclear Physics, Almaty 050032, Kazakhstan; (M.Z.); (A.K.)
| | - Tatiana Zubar
- Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus; (T.Z.); (S.T.); (A.T.); (V.F.)
- Laboratory of Single Crystal Growth, South Ural State University, 454080 Chelyabinsk, Russia;
| | - Denis Vinnik
- Laboratory of Single Crystal Growth, South Ural State University, 454080 Chelyabinsk, Russia;
| | - Mengge Dong
- Department of Resource and Environment, Northeastern University, Shenyang 110819, China;
| | - Sergey Trukhanov
- Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus; (T.Z.); (S.T.); (A.T.); (V.F.)
- Laboratory of Single Crystal Growth, South Ural State University, 454080 Chelyabinsk, Russia;
| | - Alex Trukhanov
- Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus; (T.Z.); (S.T.); (A.T.); (V.F.)
- Laboratory of Single Crystal Growth, South Ural State University, 454080 Chelyabinsk, Russia;
| | - Valery Fedosyuk
- Laboratory of Magnetic Films Physics, Scientific-Practical Materials Research Centre of National Academy of Sciences of Belarus, 220072 Minsk, Belarus; (T.Z.); (S.T.); (A.T.); (V.F.)
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Zhang H, Dvornikov AV, Huttner IG, Ma X, Santiago CF, Fatkin D, Xu X. A Langendorff-like system to quantify cardiac pump function in adult zebrafish. Dis Model Mech 2018; 11:dmm.034819. [PMID: 30012855 PMCID: PMC6177000 DOI: 10.1242/dmm.034819] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/10/2018] [Indexed: 12/22/2022] Open
Abstract
Zebrafish are increasingly used as a vertebrate model to study human cardiovascular disorders. Although heart structure and function are readily visualized in zebrafish embryos because of their optical transparency, the lack of effective tools for evaluating the hearts of older, nontransparent fish has been a major limiting factor. The recent development of high-frequency echocardiography has been an important advance for in vivo cardiac assessment, but it necessitates anesthesia and has limited ability to study acute interventions. We report the development of an alternative experimental ex vivo technique for quantifying heart size and function that resembles the Langendorff heart preparations that have been widely used in mammalian models. Dissected adult zebrafish hearts were perfused with a calcium-containing buffer, and a beat frequency was maintained with electrical stimulation. The impact of pacing frequency, flow rate and perfusate calcium concentration on ventricular performance (including end-diastolic and end-systolic volumes, ejection fraction, radial strain, and maximal velocities of shortening and relaxation) were evaluated and optimal conditions defined. We determined the effects of age on heart function in wild-type male and female zebrafish, and successfully detected hypercontractile and hypocontractile responses after adrenergic stimulation or doxorubicin treatment, respectively. Good correlations were found between indices of cardiac contractility obtained with high-frequency echocardiography and with the ex vivo technique in a subset of fish studied with both methods. The ex vivo beating heart preparation is a valuable addition to the cardiac function tool kit that will expand the use of adult zebrafish for cardiovascular research.
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Affiliation(s)
- Hong Zhang
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55902, USA.,Cardiovascular Surgery Department, the Second Xiangya Hospital of Central South University, Changsha 410011, China
| | - Alexey V Dvornikov
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55902, USA
| | - Inken G Huttner
- Molecular Cardiology Division, Victor Chang Cardiac Research Institute, Sydney, NSW 2010, Australia.,St. Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia
| | - Xiao Ma
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55902, USA.,Clinical and Translational Sciences Track, Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic College of Medicine and Science, Rochester, MN 55092, USA
| | - Celine F Santiago
- Molecular Cardiology Division, Victor Chang Cardiac Research Institute, Sydney, NSW 2010, Australia.,St. Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia
| | - Diane Fatkin
- Molecular Cardiology Division, Victor Chang Cardiac Research Institute, Sydney, NSW 2010, Australia.,St. Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia.,Cardiology Department, St. Vincent's Hospital, Sydney, NSW 2010, Australia
| | - Xiaolei Xu
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN 55902, USA
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Sridhar S, Le DM, Mi YC, Sinha S, Lai PY, Chan CK. Suppression of cardiac alternans by alternating-period-feedback stimulations. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:042712. [PMID: 23679454 DOI: 10.1103/physreve.87.042712] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 03/18/2013] [Indexed: 06/02/2023]
Abstract
Alternans response, comprising a sequence of alternating long and short action potential durations in heart tissue, seen during rapid periodic pacing can lead to conduction block resulting in potentially fatal cardiac failure. A method of pacing with feedback control is proposed to reduce the alternans and therefore the probability of subsequent cardiac failure. The reduction is achieved by feedback control using small perturbations of constant magnitude to the original, alternans-generating pacing period T, viz., using sequences of two alternating periods of T+ΔT and T-ΔT, with ΔT<<T. Such a control scheme for alternans suppression is demonstrated experimentally in isolated whole heart experiments. This alternans suppression scheme is further confirmed and investigated in detail by simulations of ion-channel-based cardiac models both for a single cell and in one-dimensional spatially extended systems. The mechanism of the success of our method can be understood in terms of dynamics in phase space, viz., as the state of activity of the cell being confined within a narrow volume of phase space for the duration of control, resulting in extremely diminished variation in successive action potential durations. Our method is much more robust to noise than previous alternans reduction techniques based on fixed point stabilization and should thus be more efficient in terms of experimental implementation, which has implications for clinical treatment for arrhythmia.
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Affiliation(s)
- S Sridhar
- The Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai 600113, India
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