Consulta: subjectFacets:"Fluorescence"
Registros recuperados: 39
Data/hora: 01/06/2024 08:39:41

Enverdecimiento de la espata de Spathiphyllum wallisii Regel
Provedor de dados: 32
Autores: 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

Пространственное распределение флуоресценции хлорофилла в южной части  Чёрного моря в поздне-весенний период.
Provedor de dados: 13
Autores: Кривенко, О. В.; Геворгиз, Н. С.; Финенко, З. З.
На основе материалов междисциплинарной базы океанографических данных по Чёрному морю проанализированы пространственная структура и изменения вертикального распределения интенсивности флуоресценции хлорофилла (ИФ) в зависимости от гидрологических, гидродинамических и гидрохимических условий в южной половине моря в апреле – мае 1994 г. Показано, что вертикальное распределение ИФ в этот период в 80 % случаев носит одномодальный характер. Максимум ИФ в основном залегает в ХПС: в низкоградиентной зоне между термоклином и основным пикноклином. Только на трети профилей его положение связано с градиентами плотности в слое температурного скачка. Максимумы ИФ, расположенные в ХПС, близки по величине и на основной части исследованной акватории наблюдаются в узком...
Tipo: Journal Contribution
Palavras-chave: Флуоресценция; Хлорофилл "а"; Нитраты; Чёрное море; Fluorescence; Chlorophyll "a"; Nitrate; Black Sea; Флуоресценція; Хлорофіл "а"; Нітрати; Чорне море.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/797

Вертикальное распределение хлорофилла и флуоресценции в Черном море
Provedor de dados: 13
Autores: Финенко, З. З.; Чурилова, Т. Я.; Ли, Р. И.
На основании обобщения большого количества данных, полученных в результате исследований многих ав­торов, установлены временные и региональные изменения вертикального распределения концентрации хло­рофилла, флуоресценции. В холодный период (с декабря по март), когда вертикальное перемешивание по­верхностного слоя происходит достаточно активно, концентрация хлорофилла в глубоководных районах мо­ря распределена относительно равномерно в слое до 40 - 50 м. В теплый период (с мая по октябрь), после установления температурной стратификации в верхнем слое, преобладают профили с одним максимумом хлорофилла. Глубина расположения максимума хлорофилла меняется в широких пределах и зависит от его концентрации. Увеличение содержания хлорофилла в планктоне приводит к...
Tipo: Journal Contribution
Palavras-chave: Черное море; Флуоресценция; Хлорофилл а; Фитопланктон; Биогенные вещества; Свет; The Black Sea; Chlorophyll a; Fluorescence; Phytoplankton; Nutrients; Irradiance Irradiance Nutrients (mineral) Phytoplankton Fluorescence Chlorophylls Fluorescence Phytoplankton Chlorophylls http://aims.fao.org/aos/agrovoc/c_10935 http://aims.fao.org/aos/agrovoc/c_13344 http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/189

Вертикальное распределение флуоресценции хлорофилла в Чёрном море в тёплый период
Provedor de dados: 13
Autores: Кривенко, О. В.
На основе обобщения материалов шести экспедиций, выполненных в Чёрном море в летний и осенний периоды с 1991 по 2005 гг., проанализировано изменение вертикального распределения интенсивности флуоресценции хлорофилла (ИФ) в зависимости от гидрологических, гидродинамических и гидрохимических условий. Показано, что одномодальные профили ИФ доминируют в Чёрном море на протяжении всего тёплого периода. В 90% случаев максимум ИФ фиксируется в слое термоклина в среднем на глубине 22 ± 7 м. Пик ИФ залегает преимущественно на глубине максимального градиента плотности при величине последне- го ~ до 0.6 кг·м-3·м-1, а при его увеличении заглубляется на 5 – 7 м. Около 40 % всех профилей характеризуются высокими значениями ИФ и в ХПС. Показано, что полуширина максимума...
Tipo: Journal Contribution
Palavras-chave: Чёрное море; Флуоресценция; Хлорофилл а; Нитраты; Чорне море; Флуоресценція; Хлорофіл а; Нітрати; Black Sea; Fluorescence; Chlorophyll a; Nitrate.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1932

Qualification des données acquises par la station de mesure MOLIT en baie de Vilaine entre février et octobre 2017
Provedor de dados: 5
Autores: Retho, Michael.
Ce rapport présente les éléments qui ont conduit à la qualification des données acquises en 2017 par la station de mesure haute fréquence MOLIT (Mer Ouverte Littoral). La bouée MOLIT est déployée depuis 2008 en baie de Vilaine, une des zones de la côte atlantique les plus menacées par l’eutrophisation. Cette bouée instrumentée constitue un des systèmes de mesure du réseau de mesure haute fréquence Ifremer HOSEA (High frequency Observation network for the environment in coastal SEAs). Elle fait également partie du réseau COAST-HF (Coastal OceAn observing SysTem – High Frequency). Cette station est équipée d’une sonde multiparamètres qui mesure les paramètres température, salinité, oxygène dissous, turbidité et fluorescence. Les mesures sont effectuées à...
Tipo: Text
Palavras-chave: MOLIT; Bouée instrumentée; Haute fréquence; Baie de Vilaine; Qualification; Température; Salinité; Oxygène dissous; Turbidité; Fluorescence.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00441/55218/56693.pdf

Qualification des données acquises par la station de mesure HF MOLIT en baie de Vilaine en 2018 et 2019
Provedor de dados: 5
Autores: Retho, Michael.
Ce rapport présente les éléments qui ont conduit à la qualification des données acquises en 2018 et 2019 par la station de mesure haute fréquence MOLIT (Mer Ouverte Littoral). La bouée MOLIT est déployée depuis 2008 en baie de Vilaine, une des zones de la côte atlantique les plus menacées par l’eutrophisation. Cette bouée instrumentée constitue un des systèmes de mesure du réseau de mesure haute fréquence COAST-HF (Coastal OceAn observing SysTem – High Frequency). Cette station est équipée d’une sonde multiparamètres qui mesure les paramètres température, salinité, oxygène dissous, turbidité et fluorescence. Les mesures sont effectuées à deux niveaux (surface et fond) avec une fréquence horaire. Ce rapport synthétise les informations qui ont permis de...
Tipo: Text
Palavras-chave: MOLIT; Bouée instrumentée; Haute fréquence; Baie de Vilaine; Qualification; Température; Salinité; Oxygène dissous; Turbidité; Fluorescence.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00636/74842/75193.pdf

Qualification des données acquises par la station de mesure MOLIT en baie de Vilaine de février à octobre 2016
Provedor de dados: 5
Autores: Retho, Michael.
Ce rapport présente les éléments qui ont conduit à la qualification des données acquises en 2016 par la station de mesure haute fréquence MOLIT (Mer Ouverte Littoral). La bouée MOLIT est déployée depuis 2008 en baie de Vilaine, une des zones de la côte atlantique les plus menacées par l’eutrophisation. Cette bouée instrumentée constitue un des systèmes de mesure du réseau de mesure haute fréquence Ifremer HOSEA (High frequency Observation network for the environment in coastal SEAs). Cette station est équipée d’une sonde multiparamètre qui mesure les paramètres température, salinité, oxygène dissous, turbidité et fluorescence. Les mesures sont effectuées à deux niveaux (surface et fond) avec une fréquence d’une mesure horaire. Ce rapport synthétise les...
Tipo: Text
Palavras-chave: MOLIT; Bouée instrumentée; Haute fréquence; Baie de Vilaine; Qualification; Température; Salinité; Oxygène dissous; Turbidité; Fluorescence.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00384/49565/50056.pdf

Simultaneous measurement of mitochondrial respiration and ATP production in tissue homogenates and calculation of effective P/O ratios
Provedor de dados: 5
Autores: Salin, Karine; Villasevil, Eugenia M.; Auer, Sonya K.; Anderson, Graeme J.; Selman, Colin; Metcalfe, Neil B.; Chinopoulos, Christos.
The use of tissue homogenate has greatly aided the study of the functioning of mitochondria. However, the amount of ATP produced per oxygen molecule consumed, that is, the effective P/O ratio, has never been measured directly in tissue homogenate. Here we combine and refine existing methods previously used in permeabilized cells and isolated mitochondria to simultaneously measure mitochondrial ATP production (JATP) and oxygen consumption (JO(2)) in tissue homogenate. A major improvement over existing methods is in the control of ATPases that otherwise interfere with the ATP assay: our modified technique facilitates simultaneous measurement of the rates of uncorrected ATP synthesis and of ATP hydrolysis, thus minimizing the amount of tissue and time needed....
Tipo: Text
Palavras-chave: ATPase; Fluorescence; Magnesium green; Oxidative phosphorylation; Oxygraph.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00414/52500/53300.pdf

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
Provedor de dados: 5
Autores: 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

Impact of Contrasted Weather Conditions on CDOM Absorption/Fluorescence and Biogeochemistry in the Eastern Lagoon of New Caledonia
Provedor de dados: 5
Autores: 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

Croissance de la coque (Cerastoderma edule) en baie de Somme : Morphométrie et Marquage
Provedor de dados: 5
Autores: 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

MAREL Carnot. Bilan d’une surveillance à haute fréquence en zone côtière sous influence anthropique (Boulogne-sur-Mer). Bilan 2019. Rapport n°14
Provedor de dados: 5
Autores: Lefebvre, Alain; Grassi, Kelly.
Installée dans la rade de Boulogne-sur-Mer et inaugurée le 25 novembre 2004, la station MAREL Carnot mesure, toutes les 20 minutes, la salinité, la température de l’eau et de l’air, la fluorescence, la turbidité, la concentration en oxygène dissous, le pourcentage de saturation en oxygène, le P.A.R., l’humidité relative, la direction et la vitesse du vent, la hauteur d’eau et toutes les 12 heures, la concentration en nitrate, en phosphate et en silicium. Ce rapport vise à présenter les principaux éléments utiles à l’utilisateur des données afin de pouvoir adapter son étude en fonction de la disponibilité des données, de leur qualité et, bien entendu, de son objectif. Les résultats des paramètres température, salinité, turbidité, concentration et saturation...
Tipo: Text
Palavras-chave: Manche orientale; Boulogne-sur-Mer; Haute fréquence temporelle; MAREL; Hydrologie; Fluorescence.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00642/75445/76264.pdf

Development of a coastal upwelling front driven by advection and topographic effects in the North Sea-Baltic Sea transition
Provedor de dados: 5
Autores: 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

The determination of total dissolved free primary amines in seawater: Critical factors, optimized procedure and artefact correction
Provedor de dados: 5
Autores: Aminot, Alain; Kerouel, Roger.
The paper reviews the methods described in the literature for the determination of total dissolved free primary amines (TDFPA) by fluorescence. A wide set of reaction conditions can be found, but they rely on few experiments for their validation. Among fluorogenic compounds, o-plithaldialdehyde (OPA) is more sensitive than fluorescamine and was thus examined here. However, the use of mercaptoethanol (ME) in the reaction (as ail additional derivatization compound) is able to generate unreliable results, in particular when standardization relies on glycine. We suggest replacing ME with 3-mercaptopropionic acid (MPA) which induces more stable and comparable fluorescence among amine Compounds. A systematic study was therefore undertaken to define reagent...
Tipo: Text
Palavras-chave: Fluorescence; Determination; Seawater; Total dissolved free primary amines.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2274.pdf

Seasonal and interannual variations (1996-2000) of the coastal waters east of the Rhone river mouth as indicated by the SORCOM series
Provedor de dados: 5
Autores: Younes, Wan; Bensoussan, N; Romano, Jc; Arlhac, D; Lafont, Maxime.
Between 1996 and 2000, 79 cruises have been achieved following always the same transect between Marseilles and the Rhone river's mouth. While cruising, salinity, temperature and fluorescence of surface waters (1.5 m) were recorded every minute, in association with precise GPS position. The whole set of data. (i.e. 128 measured points per cruise) constitutes the Sorcom series whose synthetic results ate presented here. Despite the high spatial and temporal. variability encountered between two successive cruises, the regularity and duration of the sampling strategy permitted to define coherent spatial zonation and temporal evolutions. In the Cape Couronne vicinity the dynamic of the eastern extension of the dilution plume clearly changes. Westward, waters...
Tipo: Text
Palavras-chave: Rhône; Panache de dilution; Observation à long terme; Fluorescence; Salinité; Rhone river; Dilution plume; Long term observation; Fluorescence; Salinity.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43260/42991.pdf

Influence of Freshwater Discharges on Biogeochemistry and Benthic Communities of a Coral Reef Ecosystem (La Réunion Island, Indian Ocean)
Provedor de dados: 5
Autores: 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

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)
Provedor de dados: 5
Autores: 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

The use of fluorescent Nile red and BODIPY for lipid measurement in microalgae
Provedor de dados: 5
Autores: Rumin, Judith; Bonnefond, Hubert; Saint-jean, Bruno; Rouxel, Catherine; Sciandra, Antoine; Bernard, Olivier; Cadoret, Jean-paul; Bougaran, Gael.
Microalgae are currently emerging as one of the most promising alternative sources for the next generation of food, feed, cosmetics and renewable energy in the form of biofuel. Microalgae constitute a diverse group of microorganisms with advantages like fast and efficient growth. In addition, they do not compete for arable land and offer very high lipid yield potential. Major challenges for the development of this resource are to select lipid-rich strains using high-throughput staining for neutral lipid content in microalgae species. For this purpose, the fluorescent dyes most commonly used to quantify lipids are Nile red and BODIPY 505/515. Their fluorescent staining for lipids offers a rapid and inexpensive analysis tool to measure neutral lipid content,...
Tipo: Text
Palavras-chave: Nile red; BODIPY 505/515; Microalgae; Neutral lipid; Fluorescence; Biodiesel.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00257/36823/35451.pdf

Continuous fluorescence recording as a way to improve Pacific oyster (Crassostrea gigas) models of paralytic shellfish toxin accumulation
Provedor de dados: 5
Autores: 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

Spatial compartmentalization of free radical formation and mitochondrial heterogeneity in bivalve gills revealed by live-imaging techniques
Provedor de dados: 5
Autores: Rivera-ingraham, Georgina A.; Rocchetta, Iara; Bickmeyer, Ulf; Meyer, Stefanie; Abele, Doris.
Background: Reactive oxygen (ROS) and nitrogen (RNS) species are produced during normal unstressed metabolic activity in aerobic tissues. Most analytical work uses tissue homogenates, and lacks spatial information on the tissue specific sites of actual ROS formation. Live-imaging techniques (LIT) utilize target-specific fluorescent dyes to visualize biochemical processes at cellular level. Results: Together with oxidative stress measurements, here we report application of LIT to bivalve gills for ex-vivo analysis of gill physiology and mapping of ROS and RNS formation in the living tissue. Our results indicate that a) mitochondria located in the basal parts of the epithelial cells close to the blood vessels are hyperpolarized with high Delta Psi m, whereas...
Tipo: Text
Palavras-chave: Bivalve; Gill; Live-imaging; Fluorescence; Mitochondria; ROS; RNS.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00626/73808/74412.pdf

Qualification des données acquises par la station de mesure MOLIT en baie de Vilaine entre mars et octobre 2015
Provedor de dados: 5
Autores: Retho, Michael; Gabellec, Raoul.
Ce rapport présente les éléments qui ont conduit à la qualification des données acquises en 2015 par la station de mesure haute fréquence MOLIT (Mer Ouverte Littoral). La bouée MOLIT est déployée depuis 2008 en baie de Vilaine, une des zones de la côte atlantique les plus menacées par l’eutrophisation. Cette bouée instrumentée constitue un des systèmes de mesure du réseau de mesure haute fréquence Ifremer HOSEA (High frequency Observation network for the environment in coastal SEAs). Cette station est équipée d’une sonde multiparamètre qui mesure les paramètres température, salinité, oxygène dissous, turbidité et fluorescence. Les mesures sont effectuées à deux niveaux (surface et fond) avec une fréquence d’une mesure horaire. Ce rapport synthétise les...
Tipo: Text
Palavras-chave: MOLIT; Bouée instrumentée; Haute fréquence; Baie de Vilaine; Qualification; Température; Salinité; Oxygène dissous; Turbidité; Fluorescence.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00335/44596/44324.pdf

MAREL Carnot : Rapport n° 12 : Bilan d’une surveillanceà haute fréquence en zone côtière sous influence anthropique (Boulogne-sur-Mer). Bilan 2017
Provedor de dados: 5
Autores: Lefebvre, Alain; Poisson-caillault, Emilie; Grassi, Kelly.
Installée dans la rade de Boulogne-sur-Mer et inaugurée le 25 novembre 2004, la station MAREL Carnot mesure, toutes les 20 minutes, la salinité, la température de l’eau et de l’air, la fluorescence, la turbidité, la concentration en oxygène dissous, le pourcentage de saturation en oxygène, le P.A.R., l’humidité relative, la direction et la vitesse du vent, la hauteur d’eau et, toutes les 12 heures, la concentration en nitrate, en phosphate et en silicium. Ce rapport vise à présenter les principaux éléments utiles à l’utilisateur des données afin de pouvoir adapter son étude en fonction de la disponibilité des données, de leur qualité et, bien entendu, de son objectif. Les résultats des paramètres fluorescence, turbidité, concentration en oxygène,...
Tipo: Text
Palavras-chave: Manche orientale; Boulogne-sur-Mer; Haute fréquence temporelle; MAREL; Hydrologie; Fluorescence.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00441/55258/56751.pdf

A New Glider-Compatible Optical Sensor for Dissolved Organic Matter Measurements: Test Case from the NW Mediterranean Sea
Provedor de dados: 5
Autores: 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

MAREL Carnot data and metadata from Coriolis Data Centre
Provedor de dados: 5
Autores: Lefebvre, Alain.
The MAREL (Mesures Automatisées en Réseau pour l’Environnement Littoral) Carnot system developed and implemented by Ifremer (French Research Institute for Exploitation of the sea) in 2004 is a moored buoy equipped with physico-chemical and biological measuring devices working in continuous and autonomous conditions. The system is located in the Boulogne-sur-Mer harbor (eastern English Channel) influenced both by marine coastal and fresh waters. The measuring station is equipped with high performance systems for seawater analysis and near real time data transmission. These system record with a high frequency resolution (20 minutes), the following parameters: estimated sea level, gust wind speed, wind from direction relative true north, horizontal wind...
Tipo: Dataset
Palavras-chave: MAREL Carnot; Buoy; Observing system; High frequency; Eastern English Channel; Estimated sea level; Gust wind speed; Wind from direction relative true north; Horizontal wind speed; Relative humidity; Light irradiance surface PAR; Sea temperature; Practical salinity; Ph; Dissolved oxygen; Fluorescence; Turbidity; Nitrate + nitrite; Phosphate; Silicate.
Ano: 2015
URL: http://dx.doi.org/10.17882/39754

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)
Provedor de dados: 16
Autores: 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

Hydrophobicity of an Entisol under loblolly pine (Pinus taeda) plantation
Provedor de dados: 190
Autores: 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

Physiologic parameters of soybean of determinate and indeterminate growth habit subjected to levels of soil moisture
Provedor de dados: 86
Autores: Machado Júnior,Carlos Sebastião; Silva,Cláudio Ricardo da; Sanches,Maria Cristina; Hamawaki,Osvaldo Toshiyuki; Sousa,Larissa Barbosa de.
Abstract: The objective of this work was to evaluate the physiological and production parameters of soybean (Glycine max) cultivars of determinate and indeterminate growth habits, in three levels of soil moisture. Three cultivars of determinate growth habit and three of indeterminate growth, at the beginning of the reproductive stage, were subjected to three levels of soil moisture: control, moisture at field capacity; moderated, 50% of the control level; and severe, 25% of the control level. Leaf gas exchange, xylem-water potential, chlorophyll content, chlorophyll a fluorescence, plant dry matter, and grain yield per plant were evaluated. The cultivars of indeterminate growth habit showed the greatest values for stomatal conductance and CO2 assimilation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Chlorophyll; Fluorescence; Gas exchange.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000600419

Localization and compartmentation of Al in the leaves and roots of tea plants
Provedor de dados: 85
Autores: 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

Physiology and quality of Eugenia dysenterica DC seedlings grown in vermiculite and rice husk-based substrates
Provedor de dados: 94
Autores: Mota,Clenilso Sehnen; Araújo,Eduard Lucas Souza; Silva,Fabiano Guimarães; Dornelles,Paulo; Freiberger,Mariângela Brito; Mendes,Giselle Camargo.
Abstract Eugenia dysenterica DC is a fruiting species endemic to the Brazilian Cerrado, belonging to the Myrtaceae family and popularly known as Cagaiteira. It has medicinal and antifungal properties, and has an important function in the ecosystem. Nevertheless, there are few studies about the maintenance of this species. The aim of this study was to evaluate the growth, nutrition, quality and physiology of E. dysenterica seedlings grown in fine vermiculite and rice husk-based substrates in the following combinations: 1:0, 3:1, 1:1, and 1:3, in addition to Trimix® commercial substrate and vermiculite only. The physical attributes of substrates (dry and moist densities, available water, remaining water, aeration space and total porosity), seedling emergence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cagaita; Gas exchange; Fluorescence; Quality index.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000101002

Equipment based on high power UV and white light LEDs to collect and observe scorpions (Arachnida: Scorpiones) and other fluorescent organisms
Provedor de dados: 103
Autores: 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 &amp;amp; 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

Organic matter quality in a soil cultivated with perennial herbaceous legumes
Provedor de dados: 63
Autores: Canellas,Luciano Pasqualoto; Espindola,José Antonio Azevedo; Rezende,Carlos Eduardo; Camargo,Plínio Barbosa de; Zandonadi,Daniel Basílio; Rumjanek,Victor Marcos; Guerra,José Guilherme Marinho; Teixeira,Marcelo Grandi; Braz-Filho,Raimundo.
Using herbaceous legumes in agricultural systems yields great quantities of plant residues, allowing changes in soil organic matter quality and content over the years. This study was conducted on an Ultisol, at Seropédica, RJ, Brazil, to evaluate the effects of different perennial herbaceous legumes on soil organic matter quality. A factorial scheme with three replications was used to evaluate the species: forage groundnut cv. BR-14951 (Arachis pintoi), tropical kudzu (Pueraria phaseoloides), and siratro (Macroptilium atropurpureum). After the first cut, each plot was divided into two subplots; plants were cut and left on the soil surface or cut and removed. Soil samples of a closed area covered by spontaneous vegetation (mainly C3 plants) or by Panicum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FTIR; Fluorescence; Humic acids; Humic substances; 13C.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100010

Effect of salinity and priming on seedling growth in rapeseed (Brassica napus var oleifera Del.) - doi: 10.4025/actasciagron.v35i4.17655
Provedor de dados: 1
Autores: 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

Chlorophyll a spatial inference using artificial neural network from multispectral images and in situ measurements
Provedor de dados: 42
Autores: 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

Photosynthetic response of soybean to twospotted spider mite (Acari: Tetranychydae) injury
Provedor de dados: 52
Autores: Bueno,Adeney de Freitas; Bueno,Regiane Cristina Oliveira de Freitas; Nabity,Paul David; Higley,Leon George; Fernandes,Odair Aparecido.
The twospotted spider mite Tetranychus urticae Koch is a common pest on soybean plants. To clarify plant-arthropod interaction on mite-soybean system, leaf fluorescence, photosynthetic responses to variable carbon dioxide levels, and chlorophyll content were evaluated. Significant photosynthetic rate reduction was observed due to stomatal limitation. Stomatal closure was the major plant physiological response. As a consequence, there was reduction in photosynthetic rates. Surprisingly, plants did not show chlorophyll content reduction associated with photosynthetic impairment. No differences in fluorescence data indicate that T. urticae injury did not impair the function of light harvesting and photoelectron transport. These results showed that T. urticae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tetranychus urticae; Insect-plant relationship; Fluorescence; Gas exchange; Photosynthesis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400005

Effect of Hydrostatic Pressure on the Fluorescence of Tryptophan in the Presence of Metal Ions Running title: Effect of pressure on the tryptophan
Provedor de dados: 52
Autores: 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

Trypan blue exclusion assay by flow cytometry
Provedor de dados: 56
Autores: Avelar-Freitas,B.A.; Almeida,V.G.; Pinto,M.C.X.; Mourão,F.A.G.; Massensini,A.R.; Martins-Filho,O.A.; Rocha-Vieira,E.; Brito-Melo,G.E.A.
Dye exclusion tests are used to determine the number of live and dead cells. These assays are based on the principle that intact plasma membranes in live cells exclude specific dyes, whereas dead cells do not. Although widely used, the trypan blue (TB) exclusion assay has limitations. The dye can be incorporated by live cells after a short exposure time, and personal reliability, related to the expertise of the analyst, can affect the results. We propose an alternative assay for evaluating cell viability that combines the TB exclusion test and the high sensitivity of the flow cytometry technique. Previous studies have demonstrated the ability of TB to emit fluorescence when complexed with proteins. According to our results, TB/bovine serum albumin and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trypan blue; Fluorescence; Flow cytometry; Cytotoxicity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000400307

Influence of chromium in Laguncularia racemosa (L). Gaertn f. physiology
Provedor de dados: 61
Autores: 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

Morphological analysis and photosynthetic performance of improved papaya genotypes
Provedor de dados: 61
Autores: Torres Netto,Alena; Campostrini,Eliemar; Azevedo,Letícia C.; Souza,Marcelo A.; Ramalho,José C.; Chaves,Manuela M.
Brazil is the largest world producer of papaya and the third largest exporter despite of only 1.5 to 2.0% of its production is exported. Such an underexplored exportation potential highlight the necessity for physiological studies on new cultivars and hybrids to verify their agronomic and commercial viability. Two Brazilian states, Bahia and Espirito Santo, are responsible for 80% of national production. Papaya can also be an agricultural alternative to north / northeast of Rio de Janeiro, because the region is close to consumer centers and have similar environmental conditions of the most productive regions. Nevertheless, it is worth to develop cultivars that can express the highest yield potential in this region. The aim of this work was to characterize...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L.; Fluorescence; Gas exchange; Genotypes; Growth analyses.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300005

Photosynthetic performance in jack bean [Canavalia ensiformis (L.) D.C.] under drought and after rehydration
Provedor de dados: 61
Autores: Zanella,Fábio; Watanabe,Tania Misae; Lima,Ana Lúcia da Silva; Schiavinato,Marlene Aparecida.
The effects of drought and rehydration on Canavalia ensiformis (L.) D.C. (jack bean) plants were evaluated using the following gas exchange parameters: net carbon assimilation rate (A), stomatal conductance (g s), Ci/Ca ratio and transpiration rate (E); chlorophyll a fluorescence: Fv/Fm and Fv/F0 ratio. The plants were cultivated under greenhouse conditions and after 30 days from the emergence, irrigation was suspended in the plants submitted to drought, to obtain the following predawn leaf water potential (psipd): -0.40 MPa (control), -1.00 MPa (moderate drought) and -2.30 Mpa (severe drought). Afterwards, the gas exchange and fluorescence analysis were initiated , and 24 h after rehydration the same analyses were repeated. The A, E, g s and Ci/Ca values...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Fluorescence; Moderate drought; Photosynthesis; Severe drought; Stomatal conductance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000300008