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Solomonova E, Shoman N, Akimov A, Rylkova O, Meger Y. Application of confocal microscopy and flow cytometry to identify physiological responses of Prorocentrum micans to the herbicide glyphosate. Mar Environ Res 2024; 196:106417. [PMID: 38394976 DOI: 10.1016/j.marenvres.2024.106417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 10/27/2023] [Revised: 01/25/2024] [Accepted: 02/19/2024] [Indexed: 02/25/2024]
Abstract
The physiological response of the dinoflagellate P. micans to the effect of the herbicide glyphosate at a concentration of 25-200 μg L-1 was evaluated. It has been shown that P. micans is able to grow due to the consumption of dissolved organic phosphorus formed as a result of the mineralization of glyphosate by bacteria. The addition of glyphosate to the medium inhibits the photosynthetic activity of cells; there is a pronounced inhibition of the relative electron transfer rate along the electron transport chain and the maximum quantum efficiency of the use of light energy. Morphological and ultrastructural changes in P. micans cells were evaluated at sublethal (150 μg L-1) and lethal (200 μg L-1) glyphosate concentrations. It has been shown that at a herbicide concentration of 150 μg L-1, the first signs of apoptosis appear in most P. micans cells: a decrease in lateral light scattering, cytoplasmic retraction, partial destruction of cytoplasmic organelles, a change in the morphology of nuclei, mitochondria, a change in the potential of mitochondrial membranes, and a decrease in the autofluorescence of chlorophyll in cells. At a glyphosate concentration of 200 μg L-1, P. micans showed signs of a late stage of apoptosis: violation of the integrity of intracellular organelles and chromatin organization, fragmentation of nuclei, condensation of cytoplasm, disorganization of chloroplasts in the cells, and the release of cell contents beyond the cell membrane. The effectiveness of using flow cytometry and laser scanning confocal microscopy methods for identifying signs and stages of cell apoptosis when exposed to glyphosate is discussed.
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Affiliation(s)
- Ekaterina Solomonova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation.
| | - Natalia Shoman
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation
| | - Arkady Akimov
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation
| | - Olga Rylkova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of the Russian Academy of Sciences, 2, Nahimov Avе., Sevastopol, Russian Federation
| | - Yakov Meger
- Sevastopol State University, 299053, Universitetskaya Street, 33, Sevastopol, Russian Federation
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Solomonova E, Shoman N, Akimov A. Physiological responses of the microalgae Thalassiosira weissflogii to the presence of the herbicide glyphosate in the medium. Funct Plant Biol 2024; 51:FP23205. [PMID: 38669460 DOI: 10.1071/fp23205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 04/07/2024] [Indexed: 04/28/2024]
Abstract
We evaluated changes in growth, chlorophyll fluorescence and basic physiological and biochemical parameters of the microalgae Thalassiosira weissflogii cells under the influence of the herbicide glyphosate in concentrations 0, 25, 95 and 150μgL-1 . The toxic effect of glyphosate on algae is weakly dependent on the level of cell mineral nutrition. High concentrations of the herbicide do not lead to the death of microalgae but block the process of algae cell division. An increase in the glyphosate concentration in the medium leads to a slowdown or stop of algal growth, a decrease in their final biomass, an increase in the production of reactive oxygen species (ROS), depolarisation of mitochondrial membranes and metabolic activity of algae. Glyphosate inhibits the photosynthetic activity of cells and inhibits the relative rate of electron transport in the photosynthetic apparatus. Glyphosate at the studied concentrations does not affect the size characteristics of cells and the intracellular content of chlorophyll in T. weissflogii . The studied herbicide or products of its decay retain their toxic properties in the environment for at least 9days. This result shows the need for further in-depth studies to assess the physiological response and possible acclimation changes in the functional state of oxygenic phototrophs in response to the herbicide action. The species specificity of microalgae to the effects of glyphosate in natural conditions is potentially dangerous due to a possible change in the species structure of biocoenoses, in particular, a decrease in the contribution of diatoms.
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Affiliation(s)
- Ekaterina Solomonova
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Avenue, Sevastopol, Russian Federation
| | - Natalia Shoman
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Avenue, Sevastopol, Russian Federation
| | - Arkady Akimov
- A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2, Nakhimov Avenue, Sevastopol, Russian Federation
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Shoman N, Solomonova E, Akimov A, Rylkova O, Meger Y. The comprehensive effect of copper oxide nanoparticles on the physiology of the diatom microalga Thalassiosira weissflogii. Funct Plant Biol 2023:FP22282. [PMID: 37258462 DOI: 10.1071/fp22282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 05/08/2023] [Indexed: 06/02/2023]
Abstract
The high rate of production and use of copper oxide nanoparticles (CuO NPs) results in its accumulation in the environment. However, the effect of large quantities of CuO NPs on aquatic ecosystems is not fully known. In aquatic ecosystems, phytoplankton is the primary producer of organic matter and the basis of all the trophic interactions; accordingly, the potential effect of CuO NPs on the microalgae community is of great concern. This study established the main patterns of changes in morphological, structural, functional, fluorescent and cytometric parameters in the marine diatom Thalassiosira weissflogii after adding CuO NPs to the medium at concentrations of 250-2500μgL-1. As shown, the investigated pollutant has cytotoxic, genotoxic and mechanical effect on the microalga covering almost all the aspects of cell functioning. A two-fold decrease in the culture abundance relative to the control is observed at the toxicant content of 550μgL-1 in the medium. At CuO NPs content above 750μgL-1, a pronounced inhibition of the alga growth is recorded, as well as a decrease in the efficiency of its photosynthetic apparatus, a disturbance of membrane integrity, an increase in cell volume, a rise in abundance of dead/inactive cells in the culture, enlargement and deformation of nuclei, an increase in reactive oxygen species production, and depolarisation of the mitochondrial membrane. Our results show that high CuO NPs concentrations in water can cause serious disruptions in phytoplankton functioning and in equilibrium of aquatic ecosystems in general.
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Gapon L, Kayumova M, Akimov A, Kuznetsov V. Lipoproteins And Depression In Males Of Open Population Of Middle-Urbanized Siberian City. Atherosclerosis 2019. [DOI: 10.1016/j.atherosclerosis.2019.06.588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Gapon L, Akimova E, Gakova E, Akimov A, Kuznetsov V. Trait Anxiety And Atherogenic Fractions Of Lipoproteins In Males Of Open Population Of Middle-Urbanized Siberian City. Atherosclerosis 2019. [DOI: 10.1016/j.atherosclerosis.2019.06.587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Gapon L, Akimov A, Gakova E, Kayumova M, Kuznetsov V. Associations Of Parameters Of Stress At Work And Clusters Of Metabolic Syndrome In Males Of Open Urban Population. Atherosclerosis 2019. [DOI: 10.1016/j.atherosclerosis.2019.06.536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kayumova M, Gorbunova T, Gakova E, Akimov A. THE FREQUENCY OF ASSOCIATION OF SOMATIC RISK FACTORS FOR CORONARY HEART DISEASE AND TRAIT ANXIETY IN MEN. ACTA ACUST UNITED AC 2018. [DOI: 10.29296/25877305-2018-04-07] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Golovizin A, Kalganova E, Sukachev D, Vishnyakova G, Tregubov D, Fedorov S, Akimov A, Kolachevsky N, Khabarova K, Sorokin V. Detection of 1.14 μm Magnetic Dipole Transition in Ultracold Thulium. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/201510306002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sushkov AO, Chisholm N, Lovchinsky I, Kubo M, Lo PK, Bennett SD, Hunger D, Akimov A, Walsworth RL, Park H, Lukin MD. All-optical sensing of a single-molecule electron spin. Nano Lett 2014; 14:6443-6448. [PMID: 25333198 DOI: 10.1021/nl502988n] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate an all-optical method for magnetic sensing of individual molecules in ambient conditions at room temperature. Our approach is based on shallow nitrogen-vacancy (NV) centers near the surface of a diamond crystal, which we use to detect single paramagnetic molecules covalently attached to the diamond surface. The manipulation and readout of the NV centers is all-optical and provides a sensitive probe of the magnetic field fluctuations stemming from the dynamics of the electronic spins of the attached molecules. As a specific example, we demonstrate detection of a single paramagnetic molecule containing a gadolinium (Gd(3+)) ion. We confirm single-molecule resolution using optical fluorescence and atomic force microscopy to colocalize one NV center and one Gd(3+)-containing molecule. Possible applications include nanoscale and in vivo magnetic spectroscopy and imaging of individual molecules.
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Affiliation(s)
- A O Sushkov
- Department of Physics, ‡Department of Chemistry and Chemical Biology, §School of Engineering and Applied Sciences, Harvard University , Cambridge, Massachusetts 02138, United States
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Tiecke T, Thompson J, Feist J, Akimov A, Zibrov A, Vuletić V, Lukin M. Towards hybrid quantum systems: Trapping a single atom near a nanoscale solid-state structure. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135703002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Chebakov K, Sokolov A, Akimov A, Sukachev D, Kanorsky S, Kolachevsky N, Sorokin V. Zeeman slowing of thulium atoms. Opt Lett 2009; 34:2955-2957. [PMID: 19794780 DOI: 10.1364/ol.34.002955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate laser slowing of a hot thulium atomic beam using the nearly closed cycling transition 4f(13)6s(2)((2)F(o))(J=7/2)<-->4f(12)((3)H(5))5d(3/2)6s(2)(J=9/2) at 410.6 nm. Atoms are decelerated to velocities around 25 m/s by a 40 cm Zeeman slower. The flux of slowed atoms is evaluated as 10(7) s(-1)cm(-2). The experiment explicitly indicates the possibility of trapping Tm atoms in a magneto-optical trap.
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Affiliation(s)
- K Chebakov
- P. N. Lebedev Physics Institute, Leninsky Prospekt 53, Moscow 119991, Russia
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