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Murugesan D, Moulaee K, Neri G, Ponpandian N, Viswanathan C. α-MoO 3 nanostructure on carbon cloth substrate for dopamine detection. Nanotechnology 2019; 30:265501. [PMID: 30836338 DOI: 10.1088/1361-6528/ab0cb9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Orthorhombic molybdenum oxide (α-MoO3) nanostructures were deposited on the surface of carbon cloth (CC) as a flexible and high conductive scaffold by reactive RF magnetron sputtering technique. Structure and morphology of the as prepared molybdenum coated carbon cloth (MoO3CC) were thoroughly characterized with field emission scanning electron microscopy, x-ray diffraction, energy dispersive x-ray and Raman spectroscopy. Benefiting from high surface area and superior conductivity of CC as well as electrocatalytic activity of α-MoO3 nanostructures, an electrochemical sensor was fabricated. The electrochemical behavior of this new sensor toward determination of dopamine was studied in detail by cyclic voltammetry, amperometry (AM) and square wave voltammetry (SWV). Results reported here reveal that using SWV not only enhances the sensitivity of sensors to dopamine by more than 14 times compared to AM, but also offers higher linear dynamic range (1-700 μM compared to 5-550 μM). Limit of detection, for signal to noise ratio 3, was calculated to be 0.48 μM. Applicability of the proposed sensor for measurement of dopamine in real samples, like urine and pharmaceutical formulation, was also evaluated that concluded to satisfactory results.
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Affiliation(s)
- D Murugesan
- Department of Nanoscience and Technology, Bharathiar University, Coimbatore 641046, India
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Murugesan D, Prakash S, Ponpandian N, Manisankar P, Viswanathan C. Two dimensional α-MoO3 nanosheets decorated carbon cloth electrodes for high-performance supercapacitors. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.02.062] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Vinnakota R, Ramakrishnan AM, Samdani A, Venugopal MA, Ram BS, Krishnan SN, Murugesan D, Sankaranarayanan K. A comparison of aquaporin function in mediating stomatal aperture gating among drought-tolerant and sensitive varieties of rice (Oryza sativa L.). Protoplasma 2016; 253:1593-1597. [PMID: 26631017 DOI: 10.1007/s00709-015-0916-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 11/23/2015] [Indexed: 05/09/2023]
Abstract
Climate change drastically affects the cultivation of rice, and its production is affected significantly by water stress. Adaptation of a plant to water deficit conditions is orchestrated by efficient water uptake and a stringently regulated water loss. Transpiration remains the major means of water loss from plants and is mediated by microscopic pores called stomata. Stomatal aperture gating is facilitated by ion channels and aquaporins (AQPs) which regulate the turgidity of the guard cells. In a similar manner, efficient water uptake by the roots is regulated by the presence of AQPs in the plasma membrane of root cells. In this study, we compare the efficiency of transmembrane water permeability in guard cells and root protoplasts from drought-tolerant and sensitive varieties of Oryza sativa L. In this report, we studied the transmembrane osmotic water permeability (Pos) of guard cell and root protoplasts of drought-sensitive and tolerant cultivars. The guard cells isolated from the drought-sensitive lowland rice variety ADT-39 show significant low osmotic permeability than the drought-tolerant rice varieties of Anna (lowland) and Dodda Byra Nellu (DBN) (upland local land rice). There is no significant difference in relative gene expression patterns of PIPs (Plasma membrane Intrinsic Proteins "PIP1" and "PIP2" subfamilies) in guard cells isolated from ADT-39 and Anna. While the expression levels of AQP genes remain the same between ADT-39 and Anna, there is a drastic difference in their osmotic permeability in the guard cells in spite of a higher number of stomata in Anna and DBN, hinting at a more efficient gating mechanism of AQP in the stomata of the drought-tolerant varieties studied.
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Affiliation(s)
- Rajesh Vinnakota
- Ion channel Biology Laboratory, AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chromepet, Chennai, 600 044, India
| | - Anantha Maharasi Ramakrishnan
- Ion channel Biology Laboratory, AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chromepet, Chennai, 600 044, India
| | - A Samdani
- Ion channel Biology Laboratory, AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chromepet, Chennai, 600 044, India
| | - M Anjali Venugopal
- Ion channel Biology Laboratory, AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chromepet, Chennai, 600 044, India
| | - B Sri Ram
- Ion channel Biology Laboratory, AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chromepet, Chennai, 600 044, India
| | - S Navaneetha Krishnan
- Ion channel Biology Laboratory, AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chromepet, Chennai, 600 044, India
| | - Dhandapani Murugesan
- Regional Research Station, Tamil Nadu Agricultural University, Paiyur, Krishnagiri, 635112, India
| | - Kavitha Sankaranarayanan
- Ion channel Biology Laboratory, AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chromepet, Chennai, 600 044, India.
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