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Distinct Peaks of UV-Absorbing Compounds in CDOM and Particulate Absorption Spectra of Near-Surface Great Barrier Reef Coastal Waters, Associated with the Presence of Trichodesmium spp. (NE Australia). REMOTE SENSING 2022. [DOI: 10.3390/rs14153686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Distinct absorption peaks, with maxima at around 328 nm and a shoulder at 360 nm, were observed in the UV region of the absorption spectra for both the particulate and dissolved fractions of water samples collected in Keppel Bay (NE Australia) during the presence of sporadic Trichodesmium colonies. The largest absorption coefficients for these peaks were observed in samples collected in the near-surface waters (top 2–3 cm). Values approximately 3.5–6 times greater for aCDOM(328) and 13–36 times greater for ap(328) were observed in the near-surface samples compared to those collected from the top 20 cm of the water column at the same sites. Similar UV-absorption peaks observed in other studies have been attributed to the presence of mycosporine-like amino acids (MAAs). Increased UV absorption can affect both the magnitude of the absorption coefficients in the blue end of the visible region and the spectral slope of the exponential model commonly used to describe the CDOM absorption coefficient. This, in turn, can significantly affect the accuracy of satellite retrieved estimates of ocean colour products related to CDOM and particulate absorption coefficients. In tropical waters where Trichodesmium blooms are prevalent, regional ocean colour algorithms need to be developed using in situ bio-optical measurements from both the UV and visible regions of the spectra.
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Lyu L, Wen Z, Jacinthe PA, Shang Y, Zhang N, Liu G, Fang C, Hou J, Song K. Absorption characteristics of CDOM in treated and non-treated urban lakes in Changchun, China. ENVIRONMENTAL RESEARCH 2020; 182:109084. [PMID: 31901673 DOI: 10.1016/j.envres.2019.109084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 11/23/2019] [Accepted: 12/23/2019] [Indexed: 06/10/2023]
Abstract
In urban settings, one may find (i) lakes that are non-treated (NT) and impacted by recurrent discharges of pollutants and nutrients, and (ii) lakes that, through restoration measures and active management, are treated (T) from external inputs. The optical properties of chromophoric dissolved organic matter (CDOM) have been used to assess the anthropogenic impact on lakes ecology, but their application in comparative assessments of urban lakes has not been attempted. For 2 years, we measured nutrients and CDOM properties in water samples collected from NT and T lakes in the city of Changchun, China. Significant differences in CDOM properties were found between the two types of lakes, and these results were supported by redundancy analysis. The NT lakes were eutrophic while the T lakes were mesotrophic, with mean trophic status index (TSI) of 74.2 and 50.3, respectively. The CDOM absorption coefficient at 350 nm, a(350), was 2-fold higher in NT than in T lakes (6.59 vs 3.21 m-1). In the NT lakes, CDOM components predominantly comprised large molecular weight (MW > 1000-Da) humus-like substances of allochthonous origin, whereas in the T lakes CDOM was dominated by low MW (<1000-Da) substances from autochthonous production. Seasonal fluctuation has a great influence on the CDOM concentration, but a little influence on its molecular composition. The CDOM concentration were higher in summer than in other seasons. Weather conditions (rainfall, temperature) and biophysical processes (biodegradation, photo-bleaching) likely contributed to these variations. We found the water quality of the treated lakes was getting better from 2016 to 2018. In summary, the study results, not only revealed seasonal effects, but most importantly documented the impact of human activities on the characteristics of CDOM in urban lakes. Most specifically, the sharp difference between the lakes in regard to a(350) (2-fold lower in T than in NT lakes) demonstrated the suitability CDOM absorption coefficient as an early indicator of the impact of treatment measures on the hydrochemistry of DOM in urban lakes.
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Affiliation(s)
- Lili Lyu
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Zhidan Wen
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Pierre-Andre Jacinthe
- Department of Earth Sciences, Indiana University-Purdue University Indianapolis, IN, USA
| | - Yingxin Shang
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ning Zhang
- Urban-Rural Planning Administration Center, Remote Sensing Application Center, Ministry of Housing and Urban-Rural Development of the People's Republic of China, China; Institute of Geographic Sciences and Natural Resources Research, CAS, China
| | - Ge Liu
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Chong Fang
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Junbin Hou
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China
| | - Kaishan Song
- Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China; School of Environment and Planning, Liaocheng University, Liaocheng, 252000, China.
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Seasonal variation in optically active substances at a coastal site along western Bay of Bengal. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-1257-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Overmans S, Agustí S. Latitudinal Gradient of UV Attenuation Along the Highly Transparent Red Sea Basin. Photochem Photobiol 2019; 95:1267-1279. [PMID: 31066904 PMCID: PMC6852308 DOI: 10.1111/php.13112] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Accepted: 04/21/2019] [Indexed: 01/01/2023]
Abstract
The tropical and subtropical oceans experience intense incident ultraviolet radiation (280-400 nm) while their water columns are thought to be highly transparent. This combination represents a high potential for harmful effects on organisms, yet only few reports on the UV penetration properties of oligotrophic tropical waters exist. Here, we present the pattern of UV attenuation over a wide latitudinal range of the oligotrophic Red Sea. We recorded spectroradiometer profiles of PAR and UV, together with chlorophyll-a (Chl-a) and light absorption by chromophoric dissolved organic matter (CDOM) to determine the contribution of phytoplankton and CDOM toward UV attenuation. Transparency to UV exhibited a distinct latitudinal gradient, with the lowest and highest diffuse attenuation coefficients at 313 nm (Kd (313)) of 0.130 m-1 and 0.357 m-1 observed at the northern coast off Duba, and in the south close to the Farasan islands, respectively. Phytoplankton and CDOM both modulated UV attenuation, but CDOM was found to be the key driver despite the lack of riverine inputs. We confirm that ultraviolet radiation can reach deeper into the Red Sea than previously described, which means its potential to act as a stressor and selective driver for Red Sea organisms may have been underestimated to date.
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Affiliation(s)
- Sebastian Overmans
- King Abdullah University of Science and Technology (KAUST)Red Sea Research Center (RSRC)Thuwal23955‐6900Saudi Arabia
| | - Susana Agustí
- King Abdullah University of Science and Technology (KAUST)Red Sea Research Center (RSRC)Thuwal23955‐6900Saudi Arabia
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Pushing the Limits of Seagrass Remote Sensing in the Turbid Waters of Elkhorn Slough, California. REMOTE SENSING 2019. [DOI: 10.3390/rs11141664] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Remote sensing imagery has been successfully used to map seagrass in clear waters, but here we evaluate the advantages and limitations of different remote sensing techniques to detect eelgrass in the tidal embayment of Elkhorn Slough, CA. Pseudo true-color imagery from Google Earth and broadband satellite imagery from Sentinel-2 allowed for detection of the various beds, but retrievals particularly in the deeper Vierra bed proved unreliable over time due to variable image quality and environmental conditions. Calibrated water-leaving reflectance spectrum from airborne hyperspectral imagery at 1-m resolution from the Portable Remote Imaging SpectroMeter (PRISM) revealed the extent of both shallow and deep eelgrass beds using the HOPE semi-analytical inversion model. The model was able to reveal subtle differences in spectral shape, even when remote sensing reflectance over the Vierra bed was not visibly distinguishable. Empirical methods exploiting the red edge of reflectance to differentiate submerged vegetation only retrieved the extent of shallow alongshore beds. The HOPE model also accurately retrieved the water column absorption properties, chlorophyll-a, and bathymetry but underestimated the particulate backscattering and suspended matter when benthic reflectance was represented as a horizontal eelgrass leaf. More accurate water column backscattering could be achieved by the use of a darker bottom spectrum representing an eelgrass canopy. These results illustrate how high quality atmospherically-corrected hyperspectral imagery can be used to map eelgrass beds, even in regions prone to sediment resuspension, and to quantify bathymetry and water quality.
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Long-Term Changes in Colored Dissolved Organic Matter from Satellite Observations in the Bohai Sea and North Yellow Sea. REMOTE SENSING 2018. [DOI: 10.3390/rs10050688] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Terrestrial CDOM in Lakes of Yamal Peninsula: Connection to Lake and Lake Catchment Properties. REMOTE SENSING 2018. [DOI: 10.3390/rs10020167] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Evaluation of MODIS-Aqua Atmospheric Correction and Chlorophyll Products of Western North American Coastal Waters Based on 13 Years of Data. REMOTE SENSING 2017. [DOI: 10.3390/rs9101063] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Patidar SK, Chokshi K, George B, Bhattacharya S, Mishra S. Dominance of cyanobacterial and cryptophytic assemblage correlated to CDOM at heavy metal contamination sites of Gujarat, India. ENVIRONMENTAL MONITORING AND ASSESSMENT 2015; 187:4118. [PMID: 25412889 DOI: 10.1007/s10661-014-4118-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Accepted: 10/28/2014] [Indexed: 06/04/2023]
Abstract
Industrial clusters of Gujarat, India, generate high quantity of effluents which are received by aquatic bodies such as estuary and coastal water. In the present study, microalgal assemblage, heavy metals, and physico-chemical variables were studied from different habitats. Principal component analysis revealed that biovolume of cyanobacterial and cryptophytic community positively correlated with the heavy metal concentration (Hg, As, Zn, Fe, Mo, Ni, and Co) and chromophoric dissolved organic matter (CDOM) under hypoxic environment. Green algae and diatoms dominated at comparatively lower nitrate concentration which was positively associated with Pb and Mn.
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Affiliation(s)
- Shailesh Kumar Patidar
- Salt and Marine Chemicals Discipline, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, 364002, India
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Brando VE, Dekker AG, Park YJ, Schroeder T. Adaptive semianalytical inversion of ocean color radiometry in optically complex waters. APPLIED OPTICS 2012; 51:2808-2833. [PMID: 22614582 DOI: 10.1364/ao.51.002808] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Accepted: 02/22/2012] [Indexed: 06/01/2023]
Abstract
To address the challenges of the parameterization of ocean color inversion algorithms in optically complex waters, we present an adaptive implementation of the linear matrix inversion method (LMI) [J. Geophys. Res.101, 16631 (1996)], which iterates over a limited number of model parameter sets to account for naturally occurring spatial or temporal variability in inherent optical properties (IOPs) and concentration specific IOPs (SIOPs). LMI was applied to a simulated reflectance dataset for spectral bands representing measured water properties of a macrotidal embayment characterized by a large variability in the shape and amplitude factors controlling the IOP spectra. We compare the inversion results for the single-model parameter implementation to the adaptive parameterization of LMI for the retrieval of bulk IOPs, the IOPs apportioned to the optically active constituents, and the concentrations of the optically active constituents. We found that ocean color inversion with LMI is significantly sensitive to the a priori selection of the empirical parameters g0 and g1 of the equations relating the above-surface remote-sensing reflectance to the IOPs in the water column [J. Geophys. Res.93, 10909 (1988)]. When assuming the values proposed for open-ocean applications for g0 and g1 [J. Geophys. Res.93, 10909 (1988)], the accuracy of the retrieved IOPs, and concentrations was substantially lower than that retrieved with the parameterization developed for coastal waters [Appl. Opt.38, 3831 (1999)] because the optically complex waters analyzed in this study were dominated by particulate and dissolved matter. The adaptive parameterization of LMI yielded consistently more accurate inversion results than the single fixed SIOP model parameterizations of LMI. The adaptive implementation of LMI led to an improvement in the accuracy of apportioned IOPs and concentrations, particularly for the phytoplankton-related quantities. The adaptive parameterization encompassing wider IOP ranges were more accurate for the retrieval of bulk IOPs, apportioned IOPs, and concentration of optically active constituents.
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Affiliation(s)
- Vittorio E Brando
- CSIRO Land & Water, Environmental Earth Observation Program, Canberra, Australian Capital Territory, Australia.
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Salisbury J, Vandemark D, Campbell J, Hunt C, Wisser D, Reul N, Chapron B. Spatial and temporal coherence between Amazon River discharge, salinity, and light absorption by colored organic carbon in western tropical Atlantic surface waters. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011jc006989] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- J. Salisbury
- Ocean Processes Analysis Laboratory University of New Hampshire Durham New Hampshire USA
| | - D. Vandemark
- Ocean Processes Analysis Laboratory University of New Hampshire Durham New Hampshire USA
| | - J. Campbell
- Ocean Processes Analysis Laboratory University of New Hampshire Durham New Hampshire USA
| | - C. Hunt
- Ocean Processes Analysis Laboratory University of New Hampshire Durham New Hampshire USA
| | - D. Wisser
- Water Systems Analysis Group University of New Hampshire Durham New Hampshire USA
| | - N. Reul
- Laboratoire d'Oceanographie Spatiale Institut Francais de Recherche et d'Exploitation de la Mer Plouzane France
| | - B. Chapron
- Laboratoire d'Oceanographie Spatiale Institut Francais de Recherche et d'Exploitation de la Mer Plouzane France
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Aurin DA, Dierssen HM, Twardowski MS, Roesler CS. Optical complexity in Long Island Sound and implications for coastal ocean color remote sensing. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jc005837] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Blondeau‐Patissier D, Brando VE, Oubelkheir K, Dekker AG, Clementson LA, Daniel P. Bio‐optical variability of the absorption and scattering properties of the Queensland inshore and reef waters, Australia. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jc005039] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gonsior M, Peake BM, Cooper WT, Podgorski D, D'Andrilli J, Cooper WJ. Photochemically induced changes in dissolved organic matter identified by ultrahigh resolution fourier transform ion cyclotron resonance mass spectrometry. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:698-703. [PMID: 19245004 DOI: 10.1021/es8022804] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Sunlight-induced molecular changes have been observed in two samples of dissolved organic matter (DOM) collected in the Cape Fear River system, North Carolina, USA. The molecular composition of a water sample collected in the Black River (sample B210, salinity 0) and another water sample collected within the Cape Fear River estuary (sample M61, salinity 13.7) were analyzed using an ultrahigh resolution 9.4 Tesla (T) electrospray ionization Fourier transform ion cyclotron resonance mass spectrometer. Additionally, the Ultraviolet/Visible (UV/vis) absorbance as well as the excitation emission matrix (EEM) fluorescence spectra were determined to identify changes in the optical properties associated with photochemical reactions of the chromophoric DOM (CDOM). The molecular formulas forthe Cape Fear River Estuary (M61) sample before the irradiation experiments indicated the presence of highly aromatic compounds which were not present in the unirradiated Black River sample (B210). These aromatic compounds, with oxygen-subtracted double bond equivalents (DBE-O) values greater than nine, are more photoreactive and readily photodegraded relative to saturated compounds. Compounds with DBE-O values below nine are less photoreactive. The UV/vis absorbance and EEM fluorescence results supported this different photodegradation behavior, suggesting that the photoreactivity of CDOM is highly dependent on the molecular composition of the CDOM.
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Affiliation(s)
- Michael Gonsior
- Chemistry Department, Otago University, P.O. Box 56, Dunedin, New Zealand.
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Goldstone JV, Del Vecchio R, Blough NV, Voelker BM. A Multicomponent Model of Chromophoric Dissolved Organic Matter Photobleaching¶§. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2004.tb00049.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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D'sa EJ, Miller RL. Bio-Optical Properties of Coastal Waters. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/978-1-4020-3100-7_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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17
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The relative importance of chlorophyll and colored dissolved organic matter (CDOM) to the prediction of the diffuse attenuation coefficient in shallow estuaries. ACTA ACUST UNITED AC 2005. [DOI: 10.1007/bf02732903] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Goldstone JV, Del Vecchio R, Blough NV, Voelker BM. A Multicomponent Model of Chromophoric Dissolved Organic Matter Photobleaching¶§. Photochem Photobiol 2004; 80:52-60. [PMID: 15339217 DOI: 10.1562/tm-03-17.1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Light absorption by chromophoric dissolved organic matter (CDOM) plays a number of roles in natural waters, including both control of the underwater light field and the initiation of many photochemical reactions. A multicomponent analysis was used to describe the effects of UV and visible radiation on the optical absorption spectra of two natural water samples, a Suwannee River fulvic acid standard (SRFA) and a Delaware Bay water sample. This analysis used a constrained minimization technique to fit independent spectral components to the observed bleaching behavior of the water samples under monochromatic irradiation. Spectra derived from these fits were used to predict the bleaching behavior of both samples under polychromatic irradiation (lambda > 320 nm). This approach reproduces the kinetics and spectral behavior of polychromatic photobleaching very well at times <48 h, but underpredicts the bleaching at longer time periods.
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Affiliation(s)
- Jared V Goldstone
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
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Twardowski MS. Photobleaching of aquatic dissolved materials: Absorption removal, spectral alteration, and their interrelationship. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/1999jc000281] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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