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A New Glider-Compatible Optical Sensor for Dissolved Organic Matter Measurements: Test Case from the NW Mediterranean Sea ArchiMer
Cyr, Frédéric; Tedetti, Marc; Besson, Florent; Beguery, Laurent; Doglioli, Andrea M.; Petrenko, Anne A.; Goutx, Madeleine.
The MiniFluo-UV is a new glider-compatible optical sensor for measurements of dissolved organic matter (DOM) in natural waters. The working principle, sensor design and challenges faced during the validation phase are reported. The first in situ application of the sensor during three glider deployments in the NW Mediterranean sea (spring, summer, and fall) are also presented. For these campaigns, the two channels of the sensor were adjusted to target Tryptophan-like (excitation/emission wavelengths λEx/λEm: 275/340 nm) and Phenanthrene-like (λEx/λEm: 255/360 nm) fluorescence. These were chosen because they represent fluorophores of interest commonly found in seawater. While Tryptophan (an amino-acid believed to be a by-product of biological activity) is...
Tipo: Text Palavras-chave: MiniFluo-UV; Fluorescence; Glider; Dissolved organic matter; Tryptophan; Phenanthrene; Mediterranean Sea.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00654/76597/77747.pdf
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Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific) ArchiMer
Martias, Chloe; Tedetti, Marc; Lantoine, Francois; Jamet, Leocadie; Dupouy, Cecile.
The eastern lagoon of New Caledonia (NC, Southwest Pacific), listed as a UNESCO World Heritage site, hosts the world's second longest double-barrier coral reef. This lagoon receives river inputs, oceanic water arrivals, and erosion pressure from ultramafic rocks, enriched in nickel (Ni) and cobalt (Co). The aim of this study was to characterize colored dissolved organic matter (CDOM), as well as to determine its main sources and its possible relationships (through the use of Pearson correlation coefficients, r) with biogeochemical parameters, plankton communities and trace metals in the NC eastern lagoon. Water samples were collected in March 2016 along a series of river/lagoon/open-ocean transects. The absorption coefficient at 350 nm (a(350)) revealed...
Tipo: Text Palavras-chave: CDOM; Fluorescence; Trace metals; Southwest Pacific; Coral reef lagoon; Rivers.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00481/59307/62061.pdf
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Chlorophyll a spatial inference using artificial neural network from multispectral images and in situ measurements Anais da ABC (AABC)
FERREIRA,MONIQUE S.; GALO,MARIA DE LOURDES B.T..
Considering the importance of monitoring the water quality parameters, remote sensing is a practicable alternative to limnological variables detection, which interacts with electromagnetic radiation, called optically active components (OAC). Among these, the phytoplankton pigment chlorophyll a is the most representative pigment of photosynthetic activity in all classes of algae. In this sense, this work aims to develop a method of spatial inference of chlorophyll a concentration using Artificial Neural Networks (ANN). To achieve this purpose, a multispectral image and fluorometric measurements were used as input data. The multispectral image was processed and the net training and validation dataset were carefully chosen. From this, the neural net...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Remote sensing of water; Fluorescence; Chlorophyll a; Spatial inference; Artificial neural network.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200519
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Clorofila A em genótipos de amendoim sob déficit hídrico e inoculados com rizóbios. Repositório Alice
BARBOSA, D. D.; LIMA, L. M. de.
O amendoim é uma leguminosa de importância econômica cultivada em várias regiões do Brasil e possui grande capacidade de adaptação ambiental. Apesar disso, a seca é um fator ambiental que afeta a capacidade de produção da cultura, principalmente em regiões semiáridas, causando impactos econômicos negativos. Objetivou-se avaliar a fluorescência da clorofila a em plantas de amendoim submetidas a déficit hídrico e inoculadas com rizóbios. O experimento foi realizado em casa de vegetação na Embrapa Algodão em Campina Grande-PB. Utilizou-se três genótipos de amendoim (CNPA 76 AM, 2012-4 e BRS Havana) e para tais foram aplicados os seguintes tratamentos, dois isolados de rizóbios (SEMIA 6144 e ESA 123), uma fonte química nitrogenada (sulfato de amônia) e o...
Tipo: Anais e Proceedings de eventos Palavras-chave: Fluorescência; Fotossistema II; Rendimento quântico; Rihizobium.; Seca; Rhizobium.; Fluorescence; Photosystem II..
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1064779
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Continuous fluorescence recording as a way to improve Pacific oyster (Crassostrea gigas) models of paralytic shellfish toxin accumulation ArchiMer
Baron, Regis; Couedel, Marielle; Joret, Camille; Garen, Pierre; Truquet, Philippe; Masselin, Pierre; Bardouil, Michele; Lassus, Patrick.
A simple system was used to simulate the effect of alternating toxic (paralytic shellfish poisoning toxins) and non-toxic microalgal diets on oyster feeding behaviors and rates of toxin accumulation. These experimental conditions were meant to reflect, to some extent, the incoming and outgoing fluxes of toxic algae observed at the mouth of the Penze estuary (Northern Brittany, France). Physiological and toxicological parameters were estimated based oil fluorescence measurements recorded continuously at the outlet of each experimental tank, which contained a single oyster. Q(tox), this variable describes toxin uptake in oysters, it was used (instead of the toxin ingestion rate): i) in simple graphical analyses, ii) as well as in one- and two-compartment...
Tipo: Text Palavras-chave: Skeletonema costatum; Alexandrium minutum; Fluorescence; Modeling; Kinetics; Toxin uptake; Shellfish toxin; PSP.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1400.pdf
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Croissance de la coque (Cerastoderma edule) en baie de Somme : Morphométrie et Marquage ArchiMer
Bellamy, Elise; Lefebvre, Alain; Mahe, Kelig; De Rafelis, Marc.
The bay of Somme is the first French field of cockles (Cerastoderma edule) with a production amounting to 3000 tons per year on average. In order to improve the stock management, it is necessary to increase our knowledge of this species. This study is looking at the growth of the common cockle. First, was carried out a morphometric analysis of the two left and right valves, which has revealed a perfect symmetry of the shell and has allowed us to establish strong correlations among the morphometric parameters. Then, a chemical marking study has been realized with calcein and manganese in order to obtain the exact growth. Calcein marking has showed a fluorescent stria only for an half hour immersion time at 150 mg.L-1. Likewise, the manganese marking has...
Tipo: Text Palavras-chave: Coque; Cerastoderma edule; Croissance; Baie de Somme; Marquage; Calcéine; Manganèse; Fluorescence; Cathodoluminescence; Cockle; Cerastoderma edule; Growth; Bay of Somme; Marker; Calcein; Manganese; Fluorescence; Cathodoluminescence.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00007/11815/8542.pdf
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Development of a coastal upwelling front driven by advection and topographic effects in the North Sea-Baltic Sea transition ArchiMer
Lund-hansen, Lc; Vang, T.
Upwelling of cold. saline, and nutrient rich water was observed in late September 1999 along an east-west transect in the SW Kattegat. The Kattegat forms part of the transitional zone between the high saline North Sea and the low saline Baltic Sea. The upwelling occurred after an extended period of northward flow and eastern winds in the Kattegat, that changed into a southward flow as wind ceased. The upwelling was the result of a combination of high current speeds and bottom topography whereby the high-speed inflow water was forced towards the surface at the slope. Nutrient data show that the upwelling brought nutrient rich bottom water to the light exposed surface and a related strong (1943.5 ml(-1)) bloom of Pseudo-nitzschia pseudodelicatissima was...
Tipo: Text Palavras-chave: Courant; Upwelling; Front; Fluorescence; Chlorophylle-a; Inflow; Upwelling; Frontal structure; Fluorescence; Chlorophyll-a.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43249/42980.pdf
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Does spraying of atrazine on triazine-resistant canola hybrid impair photosynthetic processes? Repositório Alice
DURIGON, M. R.; CAMERA, A. S.; CECHIN, J.; VARGAS, L.; CHAVARRIA, G..
ABSTRACT - Canola is an important rotation crop for the winter season and the use of atrazine-resistant hybrids can lead to an increase in yield. This work was aimed at evaluating the effect of atrazine on photochemical and biochemical processes of photosynthesis in triazine-resistant canola. The experiment was conducted in a greenhouse, with triazine-resistant hybrid Hyola® 555TT, in a randomized block design with three replications. The treatments consisted of application or no application of atrazine on canola plants. The plants were assessed at one, three, five, and eight days after application (DAA) for chlorophyll indexes, modulated chlorophyll a fluorescence and gas exchange. Chlorophyll indexes were higher in canola plants treated with atrazine....
Tipo: Artigo de periódico Palavras-chave: Brassica Napus; Colza; Atrazina; Herbicida; Erva Daninha; Clorofila; Gás; Canola; Atrazine; Triazines; Herbicides; Weeds; Chlorophyll; Gas exchange; Fluorescence.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113376
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Effect of Hydrostatic Pressure on the Fluorescence of Tryptophan in the Presence of Metal Ions Running title: Effect of pressure on the tryptophan BABT
Bao,Chengman; Tang,Xinhui; Ye,Shuming.
ABSTRACT The effect of pressure on the fluorescence of tryptophan in the presence of metal ions was studied by fluorescence spectrometry. It was found that at 60 MPa, the fluorescence intensity of M/Trp mixtures (M represented metal ions) increased compared to that at atmosphere pressure. The relative fluorescence efficiency of M/Trp mixtures increased with pressure. When the M/Trp ratio was above 10:1, the relative fluorescence efficiency in decreasing order was Cu2+/Trp mixtures, Ni2+/Trp mixtures and Mg2+ (K+)/Trp mixtures. When the ratio was below 10:1, the decreasing order was Cu2+/Trp mixtures and Ni2+ (Mg2+, K+)/Trp mixtures. The relative fluorescence efficiency increased with the concentration of Cu2+ and Ni2+. The variation was relate to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrostatic pressure; Tryptophan; Fluorescence; Metal ions.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100605
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Effect of salinity and priming on seedling growth in rapeseed (Brassica napus var oleifera Del.) - doi: 10.4025/actasciagron.v35i4.17655 Agronomy
Benincasa, Paolo; University of Perugia; Pace, Roberta; University of Perugia; Quinet, Muriel; Université Catholique de Louvain; Lutts, Stanley; Université Catholique de Louvain.
Experiments were performed to examine the effect of salt stress and GA3-priming on initial growth of two rapeseed cultivars, one tolerant and one sensitive to salt stress during germination. Seedlings from seeds germinated in salty (as NaCl) and non salty substrate were grown in salty and non salty hydroponics. Salt stress reduced seedling growth of the two genotypes consistently with their degree of stress tolerance during germination. Seedlings from stress sensitive seeds germinated under high salinity showed a rapid recover of growth in non stressing conditions. The effect of salt stress on shoot/root ratio was controversial, increased for lab and decreased for greenhouse experiments, probably due to different timing of stress application and additional...
Tipo: Laboratoty analysis Palavras-chave: NaCl; GA3; Root shoot; Fluorescence; Stomatal conductance.
Ano: 2013 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17655
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Endolithic algae in living stony corals: algal concentrations under influence of depth-dependent light conditions and coral tissue fluorescence in Agaricia agaricites (L.) and Meandrina meandrites (L.) (Scleractinia, Anthozoa) Naturalis
Delvoye, Laurent.
DELVOYE, L., 1992. Endolithic algae in living stony corals: Algal concentrations under influence of depth-dependent light conditions and coral tissue fluorescence in Agaricia agaricites (L) and Meandrina meandrites (L.) (Sclereactinia, Anthozoa). Studies Nat. Hist. Caribbean Region 71, Amsterdam 1992: 24-41. The relation between Scleractinians and their endolithic algae was studied in the depth range of 10 to 35 m in Curaçao. Endolithic algal concentrations are found in the skeleton under the living tissue of stony corals and never in dead parts or in coral rubble. The influences of depth-dependent light conditions and coral tissue fluorescence on endolithic algal concentrations were studied in a non-fluorescent and a fluorescent form of both Agaricia...
Tipo: Article / Letter to the editor Palavras-chave: Spectroscopy; Algal pigments.; Fluorescence; Stony corals; Endolithic algae.
Ano: 1992 URL: http://www.repository.naturalis.nl/record/503171
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Enverdecimiento de la espata de Spathiphyllum wallisii Regel Colegio de Postgraduados
González Aguilar, Susana.
Spathiphyllum spp. es conocida comúnmente como cuna de moisés, se utiliza como planta ornamental, presenta una hoja modificada (espata), de color blanco, y conforme madura enverdece. Este fenómeno típico de algunas Aráceas es poco conocido. En el presente trabajo se analizaron algunos parámetros que intervienen en el enverdecimiento. Para clasificar el enverdecimiento la clorofila se midió con un medidor portátil (SPAD-meter 50), se delimitaron tres etapas en unidades relativas “SPAD”; E1 con 5 a 10, E2 de 15 a 20 y E3 de 25 a 30, como referencia se usaron espatas blancas (B) y hojas del follaje (V) con un rango de 35 a 46 unidades relativas. El contenido de clorofila total en las hojas del follaje (2.99 gChlmg-1PF) fue el doble que en E3...
Tipo: Tesis Palavras-chave: Clorofila; Enverdecimiento; Fluorescencia; LSU de Rubisco; Maestría; Botánica; Chlorophyll; Greening; Fluorescence; LSU of Rubisco.
Ano: 2009 URL: http://hdl.handle.net/10521/1274
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Equipment based on high power UV and white light LEDs to collect and observe scorpions (Arachnida: Scorpiones) and other fluorescent organisms Rev. Bras. Zool.
Ramires,Eduardo N.; Peracetta,Luiz F.; Nogas,Cláudio; Navarro-Silva,Mário A.; Paladini,Edson P..
We introduce a new, high quality, low cost and versatile LEDs-based handset device that emits high power UV and white light, which can be used interchangeably. It offers power control and has long battery life. Even though it is optimized to detect and collect scorpions under low light conditions, it can also be used with other groups of fluorescent organisms. The device achieved superior performance in field and laboratory trials when compared with a 12 LEDs low power UV flashlight, and a 46 W black fluorescent light lamp, to locate Tityus serrulatus Lutz & Mello, 1922.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Buthidae; Fluorescence; Invertebrate collecting methods; Pest control.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000400015
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Fluorescence lifetime evaluation of whole soils from the Amazon rainforest. Repositório Alice
NICOLODELLI, G.; TADINI, A. M.; NOGUEIRA, M. S.; PORATAVIEIRA, S.; MOUNIER, S.; HUAMAN, J. L. C.; SANTOS, C. H.; MONTES, C. R.; MILORI, D. M. B. P..
Tipo: Artigo de periódico Palavras-chave: Laser-induced; Fluorescence and luminescence; Time-resolved; Fluorescence; Spectroscopy.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1078740
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Hydrophobicity of an Entisol under loblolly pine (Pinus taeda) plantation PFB - Pesquisa Florestal Brasileira
Maia, Claudia Maria Branco de Freitas; Fukamachi, Cristiane Regina Budziak; Cambronero, Yorleni Chang; Dedecek, Renato Antônio; Mangrich, Antônio Sálvio; Narimoto, Kelly Mayumi; Milori, Débora M.B.P.; Simões, Marcelo Luiz.
The understanding of soil carbon stabilization processes can be very useful in the development of mitigation techniques for CO2 emissions and global warming. The greater the hydrophobicity of soil organic matter the more stabilized soil organic carbon. Therefore,  hydrophobicity can be a sensitive index to characterizethe ‘quality’ of soil organic matter. In this context, the present work aimed to characterize the chemical  structures of humic acids collected at three different depths in a hydrophobic Entisol (Neossolo) under  loblolly plantation. The results of spectroscopic and chemical analyses (UV-Vis, fluorescence, EPR and X-ray diffractometry) indicated that, as soil depth increased, so did the content of conjugated organic structures, aromatic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Humic acids; Water repellency; Forest soil; Fluorescence; EPR; X-ray. Solos florestais; Repelência à água; RPE; Fluorescência; Raio-X..
Ano: 2010 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/86
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Impact of Contrasted Weather Conditions on CDOM Absorption/Fluorescence and Biogeochemistry in the Eastern Lagoon of New Caledonia ArchiMer
Dupouy, Cécile; Röttgers, Rüdiger; Tedetti, Marc; Frouin, Robert; Lantoine, François; Rodier, Martine; Martias, Chloe; Goutx, Madeleine.
New Caledonia (Southwest Pacific), like all tropical Pacific Island countries, is impacted by weather events, climate change, and local anthropogenic forcing. Strong erosion of particles and dissolved organic matter (DOM) from ultramafic rocks, associated with trace metals dissemination (i.e., nickel, manganese and cobalt), potentially affects lagoon waters and coral reefs surrounding the main island. The CALIOPE (CALedonian Inherent Optical PropErties) cruises were performed along the Eastern Lagoon of New Caledonia (ELNC) (400 km, 13 transects from Bay to open ocean, 51 stations) during contrasted meteorological conditions: a dry period (October 2011), a windy situation (March 2014), and a strong rainy event (March 2016). CDOM absorption and fluorescence...
Tipo: Text Palavras-chave: Chromophoric dissolved organic matter; Fluorescence; New Caledonia; Tropical Pacific; Lagoons; Biooptics; Phytoplankton; Rivers.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00620/73166/72352.pdf
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Influence of chromium in Laguncularia racemosa (L). Gaertn f. physiology Braz. J. Plant Physiol.
Rocha,Andréa C.; Canal,Emerson C.; Campostrini,Eliemar; Reis,Fabrício O.; Cuzzuol,Geraldo Rogério F..
Most studies of chromium have been realized in the sediments and in mangrove trees. However, little is known about its effect on growth and metabolism in this vegetation. L. racemosa plants were grown in solution with 20% of ionic strength of Hoagland and Arnon containing 100 mM NaCl and supplemented with 0.00, 0.05 and 0.50 mg L-1 of Cr+3. The growth, the pigments and gas exchange measurements showed no changes in response to doses of chromium. After 30 days the initiation of treatments, plants of L. racemosa had average 0.559 g of total dry weight, 1.34 mg L-1 of total chlorophyll and 7.9 µmol m-2 s-1 of A (CO2 photosynthetic assimilation). The photochemical potential efficiency was affected by the intermediate dose of 0.05 mg L-1 of Cr+3 (Fv/Fm=0.73)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbohydrates; Fluorescence; Gas exchange; Growth; Heavy metal; Mangrove.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200001
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Influence of Freshwater Discharges on Biogeochemistry and Benthic Communities of a Coral Reef Ecosystem (La Réunion Island, Indian Ocean) ArchiMer
Tedetti, Marc; Bigot, Lionel; Turquet, Jean; Guigue, Catherine; Ferretto, Nicolas; Goutx, Madeleine; Cuet, Pascale.
We investigated the influence of freshwater discharges on biogeochemistry and benthic communities of La Saline fringing reef, the largest coral reef system of La Réunion Island (France, Indian Ocean). Sampling was conducted in February–March 2012 along a land-ocean continuum, including rivers, groundwater, reef waters, and oceanic waters. Our results indicated the discharges of basalt groundwater (enriched in nitrates) in the southern part of the reef, and the discharges of sand groundwater and river waters (enriched in organic matter) in sites located northward. These discharges mainly impacted fore reef surface waters, while groundwater resurgences were more diffuse and not clearly detected in depth. We highlighted the relationship Si(OH)4/NO3– to...
Tipo: Text Palavras-chave: Coral reefs; La Reunion; Indian Ocean; Eutrophication; Groundwater; Nutrients; Organic matter; Fluorescence.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00658/77030/78316.pdf
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In-Situ Variability of DOM in Relation with Biogeochemical and Physical Parameters in December 2017 in Laucala Bay (Fiji Islands) after a Strong Rain Event ArchiMer
Koliyavu, Timoci; Martias, Chloe; Singh, Awnesh; Mounier, Stéphane; Gérard, Philippe; Dupouy, Cecile.
Heavy rain events alter the biogeochemical outflows, affects water quality and ecosystem health within the coastal waters of small Pacific Islands. We characterized snapshots of the optical fingerprints of dissolved organic matter (DOM) sources together with the select nutrients, biogeochemical and physical variables for 10 stations in December 2017 in Laucala Bay, Fiji Islands. DOM absorption coefficients and fluorescence components were determined via spectrofluorometry and Parallel Factor Analysis identifying four components: Type M, two terrestrial (humic, fulvic) components, and a protein component linked to marine biological activity. Associations of DOM together with climate variables and the other tested variables were determined via principal...
Tipo: Text Palavras-chave: DOM absorption; Fluorescence; Biogeochemistry; PARAFAC; EEM spectra; Autochthonous; Allochthonous; Chlorophyll; CDOM; FDOM.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00682/79372/81889.pdf
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Localization and compartmentation of Al in the leaves and roots of tea plants Phyton
Hajiboland,R; Poschenrieder,C.
Under acid soil conditions, solubility of aluminum (Al) increases leading to toxicity for plants. Al accumulator species such as tea, however, accumulate high levels of Al in tissues without toxicity symptoms. In this work, Al localization and compartmentation were studied in tea [Camellia sinensis (L.) O. Kuntze] grown hydroponically at 0 or 100 µM Al for eight weeks. Plant dry matter production was significantly higher in the presence of Al and accumulated up to 1.21 and 6.18 mg Al/g DW in the leaves and roots, respectively. About 40-50% of Al was partitioned into cell wall (CW)-bound fraction without any difference among leaves of different age and roots. A significant increase of the soluble phenolics fraction by Al was observed in both leaves and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aluminum; Morin; Fluorescence; Tea; Confocal laser scanning microscopy (CSLM).
Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100013
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