Consulta: subjectFacets:"Iron"
Registros recuperados: 95
Data/hora: 15/06/2024 20:44:34

Deficiencias de hierro y manganeso en hojas de frijol (Phaseolus vulgaris L.) identificadas mendiante análisis textural, color de imágenes digitales y redes neuronales artificiales.
Provedor de dados: 32
Autores: García Cruz, Edgar.
En la presente investigación se analizaron imágenes digitales de hojas de frijol (Phaseolus vulgaris L.) para identificar con un clasificador, deficiencias de hierro (Fe) y manganeso (Mn). A los 24 días después de la siembra (dds) se les suministró la solución nutritiva de acuerdo a ocho tratamientos: dos deficiencias parciales, una de 50 % Fe y otra de 50 % Mn; dos deficiencias totales totales, 0 % Fe y una más de 0 % Mn además de una interacción (0 % Fe, 0 % Mn) y dos dosis excedentes (200 % Fe y 200 % Mn); finalmente un tratamiento testigo (100 % Fe, 100 % Mn) usando como referencia la solución Steiner. A partir de imágenes digitales de muestras de hojas de los tratamientos obtenidas a los 63 dds, se calcularon variables de color con los valores...
Palavras-chave: RGB; Textura; Redes neuronales; Phaseolus vulgaris; Hierro; Manganeso; Texture; Neural networks; Iron; Manganese; Edafología; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2076

94SRC191
Provedor de dados: 8
Autores: Butler, Ian R.; Coles, Simon J.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~22~H~16~FeN~2~O~4~; Organometallic; Iron.
Ano: 1994
URL: http://ecrystals.chem.soton.ac.uk/1034/

04SRC833
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~57~H~93~FeO~9.50~P~2~S~2~; Organometallic; Catalysis; Iron.
Ano: 2004
URL: http://ecrystals.chem.soton.ac.uk/921/

03SRC643
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~22~H~36~Cl~2~FeP~2~Pd; Organometallic; Iron; Palladium; Catalysis.
Ano: 2003
URL: http://ecrystals.chem.soton.ac.uk/915/

03SRC236
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~28~H~27~FeNO~3~; Organometallic; Iron; Catalysis.
Ano: 2003
URL: http://ecrystals.chem.soton.ac.uk/914/

02SRC648
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~18~H~15~FeNO; Organometallic; Iron; Ferrocene compounds; Catalysis.
Ano: 2002
URL: http://ecrystals.chem.soton.ac.uk/912/

04SRC335
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~34~H~62~FeP~4~; Organometallic; Iron; Catalysis.
Ano: 2004
URL: http://ecrystals.chem.soton.ac.uk/918/

03SRC647
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~22~H~34~Br~2~FeP~2~; Organometallic; Iron; Catalysis.
Ano: 2003
URL: http://ecrystals.chem.soton.ac.uk/916/

04SRC551
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~30~H~52~FeP~2~; Organometallic; Catalysis; Iron.
Ano: 2004
URL: http://ecrystals.chem.soton.ac.uk/920/

02src283
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~17~H~27~FeIN~2~; Organometallic; Iron; Catalysis; Ferrocene compounds.
Ano: 2002
URL: http://ecrystals.chem.soton.ac.uk/909/

94SRC035
Provedor de dados: 8
Autores: Butler, Ian R.; Coles, Simon J.; Malik, K.M. Abdul; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~20~H~22~Cl~2~FePdS~4~; Organometallic; Palladium compounds; Iron.
Ano: 1994
URL: http://ecrystals.chem.soton.ac.uk/1017/

02SRC242
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~19~H~29~Cl~6~FeIN~2~; Organometallic; Iron; Ferrocene compounds; Catalysis.
Ano: 2002
URL: http://ecrystals.chem.soton.ac.uk/908/

03SRC648
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~24~H~14~Br~2~FeO~2~; Organometallic; Iron; Catalysis.
Ano: 2003
URL: http://ecrystals.chem.soton.ac.uk/917/

04SRC091
Provedor de dados: 8
Autores: Matthews, Craig J.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~11~H~11~FeN~4~O~10~; Organometallic; Iron; Supramolecular assemblies.
Ano: 2004
URL: http://ecrystals.chem.soton.ac.uk/988/

04SRC550
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~29~H~49~Cl~5~FeP~2~Pd; Organometallic; Iron; Palladium compounds; Catalysis.
Ano: 2004
URL: http://ecrystals.chem.soton.ac.uk/919/

02SRC741
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.; Coles, Simon J.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~22~H~23~FeNO~2~; Organometallic; Iron; Ferrocene compounds; Catalysis.
Ano: 2003
URL: http://ecrystals.chem.soton.ac.uk/913/

02src333
Provedor de dados: 8
Autores: Butler, Ian R.; Horton, Peter N.; Hursthouse, Michael B.
Tipo: Crystal Structure Data Holding
Palavras-chave: C~29~H~27~FeN; Organometallic; Iron; Ferrocene compounds; Catalysis.
Ano: 2002
URL: http://ecrystals.chem.soton.ac.uk/911/

A review of the chemistries of redox sensitive elements within suboxic zones of oxygen minimun regions
Provedor de dados: 72
Autores: Kenneth W,Bruland.
This presentation is a review of the chemistries of redox sensitive elements within suboxic regions of extreme oxygen minimum zones. Suboxic regions are defined as extreme oxygen minimum zones with dissolved oxygen &lt; 10 µmol kg-1 (and likely &lt;5 µmol kg-1), and with clear evidence of nitrate reduction, but not sulfate reduction. These are regions with nitrate deficits &gt; 10 µmol kg-1 or N* values of _10 µmol kg-1. Suboxic regions predictably occur in the tropical and subtropical eastern Pacific and the Arabian Sea. These suboxic zones are important in the global biogeochemistry of nitrogen and act as an important sink for fixed nitrogen. Minor and trace element redox couples such as iodate/iodide and leachable particulate Mn/dissolved Mn undergo...
Tipo: Journal article
Palavras-chave: Nitrate; Iodine; Manganese; Iron.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300003

Iron homeostasis related genes in rice
Provedor de dados: 74
Autores: Gross,Jeferson; Stein,Ricardo José; Fett-Neto,Arthur Germano; Fett,Janette Palma.
Iron is essential for plants. However, excess iron is toxic, leading to oxidative stress and decreased productivity. Therefore, plants must use finely tuned mechanisms to keep iron homeostasis in each of their organs, tissues, cells and organelles. A few of the genes involved in iron homeostasis in plants have been identified recently, and we used some of their protein sequences as queries to look for corresponding genes in the rice (Oryza sativa) genome. We have assigned possible functions to thirty-nine new rice genes. Together with four previously reported sequences, we analyzed a total of forty-three genes belonging to five known protein families: eighteen YS (Yellow Stripe), two FRO (Fe3+-chelate reductase oxidase), thirteen ZIP (Zinc regulated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iron; Rice; Genome analysis; Iron transporters; Ferritin.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400012

Protective effects of acerola juice on genotoxicity induced by iron in vivo
Provedor de dados: 74
Autores: Horta,Roberta Nunes; Kahl,Vivian Francilia Silva; Sarmento,Merielen da Silva; Nunes,Marisa Fernanda Silva; Porto,Carem Rejane Maglione; Andrade,Vanessa Moraes de; Ferraz,Alexandre de Barros Falcão; Silva,Juliana Da.
Abstract Metal ions such as iron can induce DNA damage by inducing reactive oxygen species (ROS) and oxidative stress. Vitamin C is one of the most widely consumed antioxidants worldwide, present in many fruits and vegetables, especially inMalpighia glabra L., popularly known as acerola, native to Brazil. Acerola is considered a functional fruit due to its high antioxidant properties and phenolic contents, and therefore is consumed to prevent diseases or as adjuvant in treatment strategies. Here, the influence of ripe and unripe acerola juices on iron genotoxicity was analyzed in vivo using the comet assay and micronucleus test. The comet assay results showed that acerola juice exerted no genotoxic or antigenotoxic activity. Neither ripe nor unripe acerola...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genotoxicity; Comet assay; Micronucleus; Acerola juice; Iron.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000100122

Girassol: nutricao mineral e adubacao.
Provedor de dados: 14
Autores: SFREDO, G. J.; CAMPO, R. J.; SARRUGE, J. R.
Exigencias nutricionais; Efeitos dos nutrientes essenciais; Calagem e adubacao.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Nutricao mineral; Brasil; Sunflower; Fertilization; Sulphur.; Adubação; Calagem; Boro; Cálcio; Cobre; Ferro; Enxofre; Fósforo; Girassol; Magnésio; Manganês; Nitrogênio; Molibdênio; Potássio; Zinco.; Brazil; Boron; Copper; Calcium; Liming; Magnesium; Manganese; Iron; Nutrition; Molybdenum; Nitrogen; Phosphorus; Potassium; Zinc.
Ano: 1984
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445619

Deficiências de cálcio, fósforo e cobre, e toxicidade pelo ferro em bubalinos na ilha de Marajó.
Provedor de dados: 14
Autores: COSTA, N. A. da; MOREIRA, J. R. de A.
bitstream/item/59123/1/CPATU-ComTec41.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Bubalino; Ilha do Marajó; Pará; Brasil; Buffalo; Deficiency; Intoxication.; Bubalus Bubalis; Cálcio; Cobre; Deficiência; Ferro; Fósforo; Intoxicação; Mortalidade.; Mineral; Amazonia; Copper; Calcium; Iron; Mortality; Phosphorus.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376355

Principais deficiências minerais em bovinos de corte.
Provedor de dados: 14
Autores: MORAES, S. da S.
Deficiências e desequilíbrios minerais em bovinos são descritas em quase todas as regiões do mundo. Os elementos minerais comumente deficientes para bovinos com dieta exclusiva de pasto são: P, Na, I, Cu, Co, e Se. Em algumas regiões sob condições especificas, Ca, Mg e Mn. Por outro lado, Fe e Mn estão, normalmente, em excesso nas regiões do Cerrado Central do Brasil e Pantanal. A ingestão de dietas deficientes ou desequilibradas de elementos minerais torna mais difícil a manutenção de concentrações ótimas nos tecidos . No inicio, causa lesões bioquímicas que induzem a trocas nas formas de funcionamento, concentração e atividade do elemento nos fluidos e tecidos do corpo. Essas alterações diferem conforme os elementos e suas funções, com o grau de duração...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Bovino de corte; Brasil; Mineral deficiencies; Sulphur; Yodine.; Cálcio; Cloro; Cobre; Cobalto; Deficiência Mineral; Ferro; Enxofre; Fósforo; Manganês; Magnésio; Iodo; Potássio; Selênio; Sódio; Zinco.; Calcium; Cobalt; Copper; Brazil; Beef cattle; Chlorine; Iron; Magnesium; Manganese; Phosphorus; Potassium; Sodium; Selenium; Zinc.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/325198

Etude du comportement geochimique du fer dans l'estuaire de la Seine
Provedor de dados: 5
Autores: Guegueniat, P; Boust, D; Gandon, R; Hemon, G; Phillipot, J; Sanchez, J; Marin, P; Pieri, J.
This paper reports the study of iron geochemical behavior by the measurement of total iron, iron associated with mineral coat, and ratio FEII/FEIII. The results of total iron are exploited by normalisation with regard to aluminium and scandium.
Tipo: Text
Palavras-chave: River discharge; Sediments; Suspended particulate matter; Ion association; Iron; Geochemical cycle.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1301.pdf

The Biogeochemistry of Electroactive Humic Substances and Its Connection to Iron Chemistry in the North East Atlantic and the Western Mediterranean Sea
Provedor de dados: 5
Autores: Dulaquais, Gabriel; Waeles, Mathieu; Gerringa, Loes J. A.; Middag, Rob; Rijkenberg, Micha J. A.; Riso, Ricardo.
We present the zonal distribution of electroactive humic-like substances (eHS) along a section from Offshore Portugal in the North East Atlantic to the Sicily Channel in the Mediterranean Sea. The concentrations were normalized to Suwannee River Fulvic Acid and ranged from 11g/L to 81g/L. The vertical distributions were typical of those previously reported for dissolved organic carbon in the Mediterranean Sea. High eHS concentrations were measured in surface water and concentrations decreased with depth before increasing again toward benthic maxima measured at some stations. We estimate that eHS represented a relatively small fraction of the natural organic matter in the Mediterranean Sea (2-5%) but considering their important role in the complexation and...
Tipo: Text
Palavras-chave: Humic substances; Iron; Mediterranean Sea; Biogeochemistry; GEOTRACES.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00616/72781/72218.pdf

Changing Biogeochemistry of the Southern Ocean and Its Ecosystem Implications
Provedor de dados: 5
Autores: Henley, Sian F.; Cavan, Emma L.; Fawcett, Sarah E.; Kerr, Rodrigo; Monteiro, Thiago; Sherrell, Robert M.; Bowie, Andrew R.; Boyd, Philip W.; Barnes, David K. A.; Schloss, Irene R.; Marshall, Tanya; Flynn, Raquel; Smith, Shantelle.
The Southern Ocean plays a critical role in regulating global climate as a major sink for atmospheric carbon dioxide (CO2), and in global ocean biogeochemistry by supplying nutrients to the global thermocline, thereby influencing global primary production and carbon export. Biogeochemical processes within the Southern Ocean regulate regional primary production and biological carbon uptake, primarily through iron supply, and support ecosystem functioning over a range of spatial and temporal scales. Here, we assimilate existing knowledge and present new data to examine the biogeochemical cycles of iron, carbon and major nutrients, their key drivers and their responses to, and roles in, contemporary climate and environmental change. Projected increases in...
Tipo: Text
Palavras-chave: Southern Ocean; Biogeochemistry; Primary production; Iron; Nutrients; Carbon; Ecosystem; Ocean acidification.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00676/78831/81113.pdf

Impact of environmental factors on in situ determination of iron in seawater by flow injection analysis
Provedor de dados: 5
Autores: Laes, Agathe; Vuillemin, Renaud; Leilde, Bernard; Sarthou, Géraldine; Bournot Marec, Claudie; Blain, Stéphane.
A sensitive method for iron determination in seawater has been adapted on a submersible chemical analyser for in situ measurements. The technique is based on flow injection analysis (FIA) coupled with spectrophotometric detection. When direct injection of seawater was used, the detection limit was 1.6 nM, and the precision 7%, for a triplicate injection of a 4 nM standard. At low iron concentrations, on line preconcentration using a column filled with 8-hydroxyquinoline (8HQ) resin was used. The detection limit was 0.15 nM (time of preconcentration = 240 s), and the precision 6%, for a triplicate determination of a I nM standard, allowing the determination of Fe in most of the oceanic regimes, except the most depleted surface waters. The effect of...
Tipo: Text
Palavras-chave: Temperature and pressure effects; Submersible chemical analyser; Seawater; In situ measurements; Iron; Flow injection analysis.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1209.pdf

New insigths on the metabolic diversity among the epibiotic microbial communitiy of the hydrothermal shrimp Rimicaris exoculata
Provedor de dados: 5
Autores: Zbinden, M; Shillito, B; Le Bris, Nadine; De Montlaur, C; Roussel, Erwan; Guyot, F; Gaill, F; Cambon-bonavita, Marie-anne.
The Rimicaris exoculata dominates the megafauna of some of the Mid Atlantic ridge hydrothermal vent sites. This species harbors a rich community of bacterial epibionts inside its gill chamber. Literature data indicate that a single 16S rRNA phylotype dominates this epibiotic community, and is assumed to be a sulfide-oxidizing bacteria. However attempts Of Cultivation were not successful and did not allow to confirm it. The aim of our study was to test the hypothesis of sulfide oxidation in the gill chamber, by a multidisciplinary approach, using in vivo experiments at in situ pressure in the presence of sulfide, microscopic observations and a molecular survey. Morphology of microorganisms, before and after treatment, was analyzed to test the effect of...
Tipo: Text
Palavras-chave: Sulfur; Methane; Iron; Intracellular granules; Hydrothermal vent shrimp; High pressure experiments.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4563.pdf

The Role of the Glyoxylate Shunt in the Acclimation to Iron Limitation in Marine Heterotrophic Bacteria
Provedor de dados: 5
Autores: Koedooder, Coco; Gueneugues, Audrey; Van Geersdaele, Remy; Verge, Valerie; Bouget, Francois-yves; Labreuche, Yannick; Obernosterer, Ingrid; Blain, Stephane.
Iron (Fe) is an essential element for marine microbial growth but is present in trace amounts (&lt;0.1 nM) in surface waters of the ocean. In heterotrophic bacteria, Fe-limitation particularly impacts ATP production as Fe is an essential co-factor of enzymes involved in the electron-transport chain as well as the tricarboxylic acid (TCA) cycle. Fe-limitation can therefore drastically reduce both bacterial growth and respiration, consequently affecting the efficiency of organic carbon remineralization. Heterotrophic bacteria possess various strategies to cope with Fe-limitation. In the present study we tested the hypothesis that the induction of the glyoxylate shunt can represent one such strategy. Genetic approaches were used to gain insight into the...
Tipo: Text
Palavras-chave: Iron; Fe-limitation; Photobacterium angustum S14; Glyoxylate shunt; Isocitrate lyase.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00468/58017/60413.pdf

Contribution of electroactive humic substances to the iron-binding ligands released during microbial remineralisation of sinking particles
Provedor de dados: 5
Autores: Whitby, Hannah; Bressac, Matthieu; Sarthou, Geraldine; Ellwood, Michael J.; Guieu, Cécile; Boyd, Philip W.
Iron is a key micronutrient in seawater, but concentrations would be negligible without the presence of organic ligands. The processes influencing the ligand pool composition are poorly constrained, limiting our understanding of the controls on dissolved iron distributions. To address this, the release of iron and iron‐binding ligands during the microbial remineralisation of sinking particles was investigated by deploying in situ particle interceptor/incubator devices at subsurface sites in the Mediterranean Sea and Subantarctic. Analyses revealed the pool of released ligands was largely dominated by electroactive humic substances (74 ± 28%). The release of ligands during remineralisation ensured that concurrently released iron remained in solution, which...
Tipo: Text
Palavras-chave: Iron; Ligand; Humic; Remineralisation; Particle; Degradation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/72981/72055.pdf

Transformation de la phase solide à travers l’estuaire de la Loire en relation avec son environnement chimique et biologique
Provedor de dados: 5
Autores: Thibault De Chanvalon, Aubin.
Before reaching the ocean, riverine particles from the Loire watershed undergo important chemical transformations in the estuary. This study aims to identify and characterize main processes involving iron (and to a lesser extent Al, Mn, PO4 3- and rare earths elements). Suspended particulate matter data show that 15% of their iron is lost through the estuary. Reductive iron dissolution during deposition periods is likely to explain most of this loss. However, estuarine sediments are characterized by high spatial heterogeneity due to macrofaunal activities. To overcome this difficulty, new methodologies of high resolution and two-dimensional analyses and calculation of pore water, sediment and benthic meiofauna were developed. These developments enable to...
Tipo: Text
Palavras-chave: Estuaire; Fer; Phosphore; Nitrate; Foraminifère benthique; Diagenèse précoce; Loire; Bioturbation; Estuary; Iron; Phosphorus; Nitrate; Benthic foraminifera; Precocious diagenesis; Loire; Bioturbation.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60932/64325.pdf

Determination of iron-porphyrin-like complexes at nanomolar levels in seawater
Provedor de dados: 5
Autores: Vong, Lilita; Laes, Agathe; Blain, Stéphane.
A new method for the non-specific determination of iron-porphyrin-like complexes in natural waters has been developed. It is based on the chemiluminescent oxidation of the luminol in the presence of dioxygen (O-2) at pH 13. The method has been implemented in a FIA manifold that allowed the direct injection of seawater. The limit of detection is 0.11 nM of equivalent hemin (Fe-protoporphyrin IX). Fe2+, Fe3+, H2O2, siderophore (deferoxamin mesylate), humic acid and phytic acid did not interfere when the), were present at the concentrations expected in seawater. Metal free porphyrin and Mg, Cu, Co porphyrin complexes did not induce a significant chemiluminescent signal. Poisoned unfiltered samples could be stored for several weeks before analyses. The new...
Tipo: Text
Palavras-chave: Chemiluminescence; Complexation; Flow injection; Seawater; Porphyrin; Iron.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3298.pdf

Processes Driving Iron and Manganese Dispersal From the TAG Hydrothermal Plume (Mid-Atlantic Ridge): Results From a GEOTRACES Process Study
Provedor de dados: 5
Autores: González-santana, David; Planquette, Helene; Cheize, Marie; Whitby, Hannah; Gourain, Arthur; Holmes, Thomas; Guyader, Vivien; Cathalot, Cecile; Pelleter, Ewan; Fouquet, Yves; Sarthou, Geraldine.
Hydrothermal vents are a recognized source of trace elements to the ocean inventory. Nevertheless, the contribution of slow-spreading ridges remains poorly resolved. To address this, high-resolution dissolved (&lt;0.45 μm) iron (dFe) and manganese (dMn) samples were collected during the GEOTRACES HERMINE GApr07 process study at the Mid Atlantic Ridge. Samples were collected at nine stations, from the TAG vent site to 75 km south-southwest following the neutrally buoyant plume. Concentrations of dMn and dFe ranged from 71 ± 6 and 51 ± 2 nmol kg–1 right above the vent site to 0.43 ± 0.01 and 1.56 ± 0.02 nmol kg–1 at the most distal station, respectively. Using a 5-box model coupled with our data, we show that as the plume traveled away from the vent,...
Tipo: Text
Palavras-chave: Iron; Manganese; Hydrothermal; TAG; Mid Atlantic Ridge; GEOTRACES.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75530/76431.pdf

Linking ocean biogeochemical cycles and ecosystem structure and function: results of the complex SWAMCO-4 model
Provedor de dados: 5
Autores: Pasquer, B; Laruelle, G; Becquevort, S; Schoemann, V; Goosse, H; Lancelot, C.
We present results obtained with SWAMCO-4, a complex model of the marine planktonic system calculating C, N, P, Si, Fe cycling within the upper ocean, the export production and the exchange of CO2 between the ocean and atmosphere. The model, constrained by physical, chemical and biological (grazing, lysis) controls, explicitly details the dynamics of four relevant phytoplankton functional groups with respect to C, N, P, Si, Fe cycling and climate change. Those are diatoms, pico/nano phytoplankton, coccolithophorids, and Phaeocystis spp. whose growth regulation by light, temperature and nutrients has been obtained based on a comprehensive analysis of literature reviews on these taxonomic groups. The performance of SWAMCO-4 is first evaluated in a 1D...
Tipo: Text
Palavras-chave: Ecological modelling; Diatoms; Pico/nanophytoplankton; Coccolithophorids; Phaeocystis spp.; Iron; Air-sea CO2 fluxes; Global ocean; Antarctic ocean; North Atlantic.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/00232/34302/32677.pdf

Investigations into the uptake of copper, iron and selenium by a highly sulphated bacterial exopolysaccharide isolated from microbial mats
Provedor de dados: 5
Autores: Moppert, Xavier; Le Costaouec, Tinaig; Raguenes, Gerard; Courtois, Anthony; Simon-colin, Christelle; Crassous, Philippe; Costa, Bernard; Guezennec, Jean.
A bacterium isolated from microbial mats located on a polynesian atoll produced a high molecular weight (3,000 kDa) and highly sulphated exopolysaccharide. Previous studies showed that the chemical structure of this EPS consisted of neutral sugars, uronic acids, and high proportions of acetate and sulphate groups. The copper- and iron-binding ability of the purified pre-treated native EPS was investigated. Results showed that this EPS had a very high affinity for both copper (9.84 mmol g(-1) EPS) and ferrous iron (6.9 mmol g(-1) EPS). Amazingly, this EPS did not show any affinity for either ferric ions or selenium salts. This finding is one of the first steps in assessing the biotechnological potential of this polysaccharide.
Tipo: Text
Palavras-chave: Sulphated exopolysaccharide; Microbial mats; Iron; Copper; Binding capacity.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6397.pdf

Contribution of resuspended sedimentary particles to dissolved iron and manganese in the ocean: An experimental study
Provedor de dados: 5
Autores: Cheize, Marie; Planquette, H.f.; Fitzsimmons, J.n.; Pelleter, Ewan; Sherrell, R.m.; Lambert, Christophe; Bucciarelli, E.; Sarthou, G.; Le Goff, Marion; Liorzou, Celine; Chéron, Sandrine; Viollier, E.; Gayet, Nicolas.
A number of trace metals play essential roles in marine ecosystem structure and biological productivity. Until recently, it has been argued that phytoplankton access primarily dissolved iron, while particulate iron was considered a refractory material with little use biologically and limited interaction with the dissolved pool. In order to assess the transfer mechanisms between sediment-sourced particulate trace metals and the dissolved pool, we conducted a 14-month incubation that reacted resuspended sediments with natural seawater, both originating from the Kerguelen area (KEOPS cruises; Southern Ocean), in the dark, and at concentrations replicating natural conditions. Three types of sediments were investigated (named BioSi, BioSi + Ca, and Basalt),...
Tipo: Text
Palavras-chave: Suspended particle dissolution; Sediment; Iron; Manganese; Biogenic silica; Southern Ocean; Kerguelen.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00460/57197/59166.pdf

Stimulation of nitrogen-fixing cyanobacteria in a Baltic Sea plankton community by land-derived organic matter or iron addition
Provedor de dados: 5
Autores: Stolte, Willem; Balode, Maija; Carlsson, Per; Grzebyk, Daniel; Janson, Sven; Lips, Inga; Panosso, Renata; Ward, Clive J.; Graneli, Edna.
In the Baltic Sea, floating blooms of nitrogen-fixing cyanobacteria occur yearly during late summer. These blooms can sometimes be limited by iron. Due to extensive foresting around the Baltic Sea, iron is entering the Baltic Sea partly bound to dissolved organic material (DOM) via rivers. An experiment was performed in 300 1 laboratory mesocosms to test the hypothesis that riverine high-molecular weight dissolved organic matter (HMWDOM), extracted by tangential flow filtration &gt; 1000 Da, stimulates the biomass of nitrogen-fixing cyanobacteria, by increasing the availability of iron. The addition of iron/EDTA and of DOM resulted in 5 to 10 times higher biomass of nitrogen-fixing cyanobacteria. Accordingly, higher primary production and particulate...
Tipo: Text
Palavras-chave: Mesocosm experiment; Humic acid; HMWDOM; High molecular weight dissolved organic matter; Iron; Nitrogen fixation; Cyanobacteria.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2470.pdf

Regulation of the Phytoplankton Heme b Iron Pool During the North Atlantic Spring Bloom
Provedor de dados: 5
Autores: Louropoulou, Evangelia; Gledhill, Martha; Browningi, Thomas J.; Desai, Dhwani K.; Barraqueta, Jan-lukas Menzel; Tonnard, Manon; Sarthou, Geraldine; Planquette, Helene; Bowie, Andrew R.; Schmitz, Ruth A.; Laroche, Julie; Achterberg, Eric P.
Heme b is an iron-containing co-factor in hemoproteins. Heme b concentrations are low (&lt; 1 pmol L-1) in iron limited phytoplankton in cultures and in the field. Here, we determined heme b in marine particulate material (&gt; 0.7 mu m) from the North Atlantic Ocean (GEOVIDE cruise - GEOTRACES section GA01), which spanned several biogeochemical regimes. We examined the relationship between heme b abundance and the microbial community composition, and its utility for mapping iron limited phytoplankton. Heme b concentrations ranged from 0.16 to 5.1 pmol L-1 (median = 2.0 pmol L-1, n = 62) in the surface mixed layer (SML) along the cruise track, driven mainly by variability in biomass. However, in the Irminger Basin, the lowest heme b levels (SML: median =...
Tipo: Text
Palavras-chave: Heme b; North Atlantic; Phytoplankton; Diatoms; Iron; Limitation; GEOTRACES; GEOVIDE.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00508/61940/66029.pdf

An iron cycle cascade governs the response of equatorial Pacific ecosystems to climate change
Provedor de dados: 5
Autores: Tagliabue, Alessandro; Barrier, Nicolas; Du Pontavice, Hubert; Kwiatkowski, Lester; Aumont, Olivier; Bopp, Laurent; Cheung, William W. L.; Gascuel, Didier; Maury, Olivier.
Earth System Models project that global climate change will reduce ocean net primary production (NPP), upper trophic level biota biomass and potential fisheries catches in the future, especially in the eastern equatorial Pacific. However, projections from Earth System Models are undermined by poorly constrained assumptions regarding the biological cycling of iron, which is the main limiting resource for NPP over large parts of the ocean. In this study, we show that the climate change trends in NPP and the biomass of upper trophic levels are strongly affected by modifying assumptions associated with phytoplankton iron uptake. Using a suite of model experiments, we find 21st century climate change impacts on regional NPP range from −12.3% to +2.4% under a...
Tipo: Text
Palavras-chave: Climate change; Iron; Marine ecosystems; Net primary production; Ocean.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00652/76417/77470.pdf

Iron Transformation Pathways and Redox Micro-Environments in Seafloor Sulfide-Mineral Deposits: Spatially Resolved Fe XAS and delta Fe-57/54 Observations
Provedor de dados: 5
Autores: Toner, Brandy M.; Rouxel, Olivier; Santelli, Cara M.; Bach, Wolfgang; Edwards, Katrina J.
Hydrothermal sulfide chimneys located along the global system of oceanic spreading centers are habitats for microbial life during active venting. Hydrothermally extinct, or inactive, sulfide deposits also host microbial communities at globally distributed sites. The main goal of this study is to describe Fe transformation pathways, through precipitation and oxidation-reduction (redox) reactions, and examine transformation products for signatures of biological activity using Fe mineralogy and stable isotope approaches. The study includes active and inactive sulfides from the East Pacific Rise 9 degrees 50'N vent field. First, the mineralogy of Fe(III)-bearing precipitates is investigated using microprobe X-ray absorption spectroscopy (RXAS) and X-ray...
Tipo: Text
Palavras-chave: Hydrothermal; East Pacific Rise; X-ray absorption spectroscopy; Stable isotopes; Micro-environment; Mineral alteration; Iron; Biosignature.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00337/44810/44375.pdf

Trace element behaviour at cold seeps and the potential export of dissolved iron to the ocean
Provedor de dados: 5
Autores: Lemaitre, Nolwenn; Bayon, Germain; Ondreas, Helene; Caprais, Jean-claude; Freslon, Nicolas; Bollinger, Claire; Rouget, Marie-laure; De Prunele, Alexis; Ruffine, Livio; Olu-le Roy, Karine; Sarthou, Geraldine.
Seawater samples were collected by submersible above methane seeps in the Gulf of Guinea (Regab and Baboon pockmarks) in order to investigate the behaviour of iron (Fe), manganese (Mn) and rare earth elements (REE) during fluid seepage. Our aim was to determine whether cold seeps may represent potential sources of dissolved chemical species to the ocean. Dissolved (&lt;0.45 μm filtered samples) and total dissolvable (unfiltered samples) concentrations were determined over ∼50 m long vertical transects above the seafloor and at various discrete locations within the pockmarks. We show that substantial amounts of Fe and Mn are released into seawater during seepage of methane-rich fluids. Mn is exported almost quantitatively in the dissolved form (more than...
Tipo: Text
Palavras-chave: Iron; Rare earth elements; Cold seeps; Seawater; Organic ligands; Iron-sulfide nanoparticles.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00211/32190/30704.pdf

Long-Term In Situ Survey of Reactive Iron Concentrations at the EMSO-Azores Observatory
Provedor de dados: 5
Autores: Laes-huon, Agathe; Cathalot, Cecile; Legrand, Julien; Tanguy, Virginie; Sarradin, Pierre-marie.
A study of the temporal dynamics of iron concentrations and temperature on a faunal assemblage at the Lucky Strike vent was performed using the Tempo ecological module at the EMSO-Azores deep-sea observatory. The CHEMINI in situ analyzer was implemented on this structure to determine reactive iron concentrations in unfiltered seawater samples along with a temperature probe. Stability tests were performed on the CHEMINI analyzer before deployment (optical module, hyperbaric tests, and deep-sea calibration) for long-term in situ analysis of reactive iron (six months, 2013–2014) at the Tour Eiffel active edifice. Recorded daily, the in situ standard (25 \mu mol.L {}^{-1} ) showed excellent reproducibility (1.07%, n=522 ), confirming satisfactory analytical...
Tipo: Text
Palavras-chave: Deep-sea observatory; Hydrothermal vent; In situ chemical analyzer; Iron; Monitoring the Mid-Atlantic Ridge (MoMAR).
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00342/45275/46432.pdf

On the early fate of hydrothermal iron at deep-sea vents: A reassessment after in situ filtration
Provedor de dados: 5
Autores: Waeles, Mathieu; Cotte, Laura; Pernet-coudrier, Benoit; Chavagnac, V.; Cathalot, Cecile; Leleu, T.; Laes-huon, Agathe; Perhirin, Antoine; Riso, R. D.; Sarradin, Pierre-marie.
Deep-sea hydrothermal venting is now recognized as a major source of iron (Fe), an essential trace element that controls marine productivity. However, the reactions occurring during dispersal from buoyant plumes to neutrally buoyant hydrothermal plumes are still poorly constrained. Here we report for the first time on the dissolved-particulate partition of Fe after in situ filtration at the early stage of mixing at different hydrothermal discharges, i.e., Lucky Strike (37 degrees N), TAG (26 degrees N), and Snakepit (23 degrees N) on the Mid-Atlantic Ridge. We found that hydrothermal iron is almost completely preserved (&gt;90%) in the dissolved fraction, arguing for low iron-bearing sulfide precipitation of iron in basalt-hosted systems with low Fe:H2S...
Tipo: Text
Palavras-chave: Hydrothermal; Iron; Sulfide; Venting; Filtration; Precipitation.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00388/49944/50522.pdf

Crassostrea gigas ferritin: cDNA sequence analysis for two heavy chain type subunits and protein purification
Provedor de dados: 5
Autores: Durand, Jean-pierre; Goudard, Françoise; Pieri, Jacques; Escoubas, Jean-michel; Schreiber, Nathalie; Cadoret, Jean-paul.
Ferritin has been shown as being the principal iron storage in the majority of living organisms. In marine species, ferritin is also involved in high-level accumulation of Po-210. As part of our work on the investigation of these radionuclides' concentration in natural environment, ferritin was searched at the gene and protein level. Ferritin was purified from the visceral mass of the oyster Crassostrea gigas by ion-exchange chromatography and HPLC. SDS-PAGE revealed one band of 20 kDa. An Expressed Sequence Tag (EST) library was screened and led to the identification of two complementary DNA (cDNA) involved in ferritin subunit expression. The complete coding sequences and the untranslated regions (UTRs) of the two genes were obtained and a 5' Rapid...
Tipo: Text
Palavras-chave: Iron; IRE; EST; Oyster.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-693.pdf

Effect of seafloor depth on phytoplankton blooms in high-nitrate, low-chlorophyll (HNLC) regions
Provedor de dados: 5
Autores: Tyrrell, T.; Merico, A.; Waniek, J. J.; Wong, C. S.; Metzl, N.; Whitney, F.
We calculated correlations between seafloor depth and phytoplankton blooms in all three main high-nitrate, low-chlorophyll (HNLC) regions, but with a particular focus on the subarctic North Pacific area. It has long been known that the central parts of the east and west subarctic North Pacific are HNLC regions. The deep western basin of the Bering Sea is also HNLC, whereas the wide continental shelf of the eastern Bering Sea is not. We carried out a statistical comparison of spatial maps of (1) seafloor depth and (2) chlorophyll a concentration from satellite data. This comparison reveals that shallow waters have, on average, higher peak chlorophyll a concentrations (more intense phytoplankton blooms) than deep waters (p &lt;&lt; 0.01). Possible artifacts...
Tipo: Text
Palavras-chave: Phytoplankton; Ocean color; Bathymetry; HNLC; North Pacific; Iron.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/00232/34337/32758.pdf

Immunohistochemical Studies on Duodenum, Spleen and Liver in Mice: Distribution of Ferroportin and Prohepcidin in an Inflammation Model
Provedor de dados: 77
Autores: D´Anna,María Cecilia; Giorgi,Gisela; Roque,Marta Elena.
Duodenum, spleen and liver have a crucial role in iron balance on the whole organism and are the major sites of Ferroportin (FPN) expression. Specific regulations between FPN and hepcidin are responsible for changes seen in physiopathological conditions such as inflammation. We studied in vivo effects of turpentine oil-induced acute inflammation on FPN expression, and its relation with prohepcidin and iron mobilization. Immunohistochemical procedures were performed using rabbit anti-mouse FPN and prohepcidin antibodies with goat-labeled polymer-HRP anti-rabbit (DAB) as secondary antibody. Plasma and tissular iron were also studied. Our results showed a notable expression and redistribution of duodenal FPN to basolateral membrane in turpentine-treated mice,...
Tipo: Journal article
Palavras-chave: Iron; Mobilization; Macrophages; Enterocytes.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300014

Freshwater parameters in the state of Rio Grande do Sul, southern Brazil, and their influence on fish distribution and aquaculture
Provedor de dados: 83
Autores: Souza,Carine de F.; Pereira Junior,Waterloo; Garcia,Luciano de O.; Santos,Felipe C. dos; Baldisserotto,Bernardo.
ABSTRACT This study analyzed the relationship between several water quality parameters (pH, hardness, alkalinity, turbidity, iron and manganese) levels measured over a 16 year period with fish distribution and aquaculture in the state of Rio Grande do Sul, Southern Brazil. The mean pH values were within a neutral range (6.5-7.5), but the maximum and minimum values reached inappropriate levels for fish farming in some cities. Alkalinity levels were very low (except in the southwest region of the state), which may have contributed to pH variation. Hardness, turbidity, iron (except the region near Caçapava do Sul City) and manganese were within safe ranges for fish farming; however, turbidity levels occasionally increased to levels outside the safe range. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alkalinity; Hardness; Iron; PH; Turbidity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300205

Nano partículas de hierro añadidas al oeste de las Islas Galápagos
Provedor de dados: 20
Autores: Pazmiño, N.
La preocupación de efectuar estos estudios que alteran el medio natural, y que se dan en las aguas adyacentes a nuestra jurisdicción, pueden poner en riesgo la reserva marina de las Galápagos, por las condiciones oceanográficas en el área a 300 millas al Oeste de estas islas. Específicamente, el área influenciada por la Corriente Cromwell que fluye sub-superficialmente de Oeste a Este a través de la termoclina a lo largo de la línea ecuatorial puede afectar al ecosistema insular.
Tipo: Journal Contribution
Palavras-chave: Iron; Chemical fertilizers; Environmental effects; Iron; Http://aims.fao.org/aos/agrovoc/c_3950.
Ano: 2007
URL: http://hdl.handle.net/1834/2365

Notas acerca de la fertilización por hierro
Provedor de dados: 20
Autores: Rentería, W.; Ortega, J.
La fertilización de los océanos con hierro han sido presentada como solución a corto plazo para poder reducir CO2 de la atmósfera. Esta afirmación presentada hace 20 años ha liderado y ha despertado un controversial debate sobre las posibles consecuencias en el clima. La bioquímica del hierro es un sistema complejo y su estudio en el océano es relativamente nuevo en comparación con los otros nutrientes, sin embargo, este sistema ha sido descrito en varios estudios que ayudan en la compresión de la afirmación intrincada sobre los beneficios de la fertilización con hierro. El objetivo de este estudio es describir los aspectos relacionados con los fundamentos de la fertilización con hierro, discutiendo acerca de la afirmación de la limitación de hierro y la...
Tipo: Journal Contribution
Palavras-chave: Iron; Pollution effects; Carbon dioxide.
Ano: 2012
URL: http://hdl.handle.net/1834/4715

Etude des polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans les moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier.
Provedor de dados: 20
Autores: Dartige, A.Y.
Ce travail a pour objectif de déterminer le niveau de contamination des produits halieutiques mauritaniens. Pour cela, nous avons étudié les polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans des moules (&lt;Perna perna&gt;) prélevées au niveau de la baie du Lévrier en Mauritanie sur une période de quatre mois (novembre 1998 à février 1999). Sur les 400 échantillons analysés les moyennes de concentrations trouvées restent faibles par rapports à celles trouvées dans d'autres zones peu polluées (Amiard et al. 1986b). Ce qui n'est pas le cas du cadmium qui présente des valeurs plus élevées, phénomène fréquemment rencontré le long de la côte ouest africaine (Sidoumou et al. 1992). Par ailleurs, dans cette présente étude il apparaît que les moules de petites...
Tipo: Other
Palavras-chave: Chemical analysis; Copper; Environmental conditions; Iron; Mercury; Size; Zinc; Copper; Iron; Environmental conditions; Mercury; Size; Zinc; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_3950; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_4751; Http://aims.fao.org/aos/agrovoc/c_7093; Http://aims.fao.org/aos/agrovoc/c_8517.
Ano: 1999
URL: http://hdl.handle.net/1834/1225

Growing chickpea in Eastern Africa
Provedor de dados: 30
Autores: HenkA.van.
Palavras-chave: Rhizobium; Root nodulation; Chickpeas; Seedbeds; Fungi; Fruits; Iron; Weeds; Diseases; Tropical zones.
Ano: 1991
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4241

Groundnut Elite Germplasm ICGV 86031
Provedor de dados: 30
Palavras-chave: Necrosis; Viruses; Germplasm; Photoperiodicity; Genotypes; Minerals; Groundnuts; Wet season; Iron; Tolerance.
Ano: 1992
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3829

Facility for Growing Plants in Test Tubes at ICRISAT
Provedor de dados: 30
Autores: O.P.
Palavras-chave: Rhizobium; Chickpeas; Pigeonpeas; Root nodulation; Temperature; Nitrogen fixation; Polymers; Iron; Tropical zones; Quality.
Ano: 1984
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4025

Groundnut Varieties: Kouklia (ICGV 89214), Nikoklia (ICGV 88438), and Gigas (ICGV 91098)
Provedor de dados: 30
Palavras-chave: Humus; Breeds (animals); Plant habit; Liming; Cropping systems; Groundnuts; Iron; Tolerance; Summer; Environment.
Ano: 1996
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3878

The contribution of ICRISAT's mandate crops to household food security
Provedor de dados: 30
Autores: K.R.
Palavras-chave: Carotenes; Iron; Nutrient intake; Pigeonpeas; Millets; Cereals; Leaf vegetables; Sorghum; Vitamins; Chickpeas.
Ano: 1998
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4209

Growing chickpea in India
Provedor de dados: 30
Autores: J.
Palavras-chave: Fungi; Rhizobium; Chickpeas; Relay cropping; Seedbeds; Iron; Root nodulation; Millets; Grain legumes; Diseases.
Ano: 1997
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4242

Diagnostics of Sorghum and Pearl Millet grains-based nutrition in India
Provedor de dados: 30
Autores: Rao, P.P.
Palavras-chave: Millets; Sorghum; Nutrient intake; Zinc; Cereals; Grain legumes; Proteins; Iron; Nutrients; Vitamins.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3199

A rapid screening method for grain iron content in Pearl Millet
Provedor de dados: 30
Autores: Velu, G.
Palavras-chave: Wood decay; Genotypes; Grain; Millets; Protocols; Flours; Sampling; Iron; Absorption; Potassium.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3210

Chickpea Desi Variety ICCL 80074 (ICCC 37)
Provedor de dados: 30
Palavras-chave: Chickpeas; Iron; Yields; Tolerance; Carbohydrates; Performance; Research methods; Proteins; Tropical zones; Fungi.
Ano: 1990
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3795

Kinetics of iron (II) oxidation in seawater of various pH
Provedor de dados: 27
Autores: Roekens, E.J.; Van Grieken, R.E.
The rate of iron(II) oxidation in the North Sea water of pH 5.5-10 in the range 10-25°C has been studied. The oxygenation rate depends linearly on the iron(II) and dissolved oxygen concentrations. The second-order dependence on (OH&lt;sup&gt;-&lt;/sup&gt;), found by several investigators for synthetic solutions, was confirmed in seawater, but only for pOH&gt;6.9. For pOH&lt;5.9 the rate appeared to be independent of the pOH. In the intermediate range, pOH&lt;5.9-6.9, corresponding to the natural pH of seawater, a first-order dependence on the pOH is obeyed. The important discrepancy in the literature between the second-order rate constant for NaCHO&lt;sub&gt;3&lt;/sub&gt; solutions and for seawater can be attributed predominantly to the incorrect...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iron; Kinetics; Oxidation.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3293

Detection of siderophores in endophytic bacteria Methylobacterium spp. associated with Xylella fastidiosa subsp. pauca
Provedor de dados: 86
Autores: Lacava,Paulo Teixeira; Silva-Stenico,Maria Estela; Araújo,Welington Luiz; Simionato,Ana Valéria Colnaghi; Carrilho,Emanuel; Tsai,Siu Mui; Azevedo,João Lúcio.
The objective of this work was to study the production of siderophores by endophytic bacteria Methylobacterium spp., which occupy the same ecological niche as Xylella fastidiosa subsp. pauca (Xfp) in citrus plants. The siderophore production of Methylobacterium strains was tested according to chromeazurol agar assay test (CAS), Csáky test (hydroxamate-type) and Arnow test (catechol-type). In addition, the ability of Xfp to use siderophores, in vitro, produced by endophytic bacteria as source of iron, was evaluated. All 37 strains of Methylobacterium spp. tested were CAS-positive for siderophore production. Methylobacterium spp. produced hydroxamate-type, but not catechol-type siderophores. In vitro growth of Xfp was stimulated by the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus variegated chlorosis; Endophytes; Heterologous siderophores; Iron; Symbionts.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000400011

Hard Driving and Efficiency: iron production in 1890
Provedor de dados: 31
Autores: Berck,   Peter.
Published in Journal of economic history, v.38:4, Dec. 1978, p.879-900
Tipo: Working or Discussion Paper
Palavras-chave: Iron; Natural resources; Resource /Energy Economics and Policy.
Ano: 1977
URL: http://purl.umn.edu/37689

BIOFORTIFICATION, AN ALTERNATIVE TO REDUCE FOOD INSECURITY AND ITS ADVERSE EFFECTS IN DEVELOPING COUNTRIES: A HONDURAS CASE STUDY
Provedor de dados: 31
Autores: Perez Suarez,   Salomon.
Food insecurity can generate nutritional problems such as iron deficiency anemia, which in countries like Honduras is a moderate public health problem. The AgroSalud project is enhancing the iron content of beans and rice in order to improve the iron intake of vulnerable groups, especially children under five years and pregnant women. Iron- biofortified rice and beans together can reduce the deficit in iron intake by more than a 100% depending on the age group, farmer adoption and other variables. This, in turn, would increase the number of healthy (disability-adjusted life years, DALYs) years that the Honduran population could live.
Tipo: Conference Paper or Presentation
Palavras-chave: Food security; Biofortification; Iron; Rice; Beans; Honduras; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Z00.
Ano: 2010
URL: http://purl.umn.edu/116449

THE IMPACT OF MICRONUTRIENTS ON LABOR PRODUCTIVITY: EVIDENCE FROM RURAL INDIA
Provedor de dados: 31
Autores: Weinberger,   Katinka.
Micronutrient malnutrition, particularly of iron, is widespread on the South Asian subcontinent and economic losses due to reduced productivity of afflicted population groups are believed to be substantial. This paper examines the impact of micronutrient intake on productivity of house-hold engaged in agricultural labor in India by applying a two-stage least squares (2SLS) estimation technique. The micronutrient under investigation is iron. The results indicate that productivity, measured in wages is indeed affected through insufficient intake, and that wages would on average be 5 to 17.3 percent higher, if households would achieve recommended intake levels of the micronutrient discussed here. The results demonstrate that policy interventions that aim at...
Tipo: Conference Paper or Presentation
Palavras-chave: Micronutrient malnutrition; Iron; Productivity; India; Labor and Human Capital.
Ano: 2003
URL: http://purl.umn.edu/25897

Iron Uptake by Fungi Isolated from Arcelor Mittal -Annaba- in the Northeast of Algeria
Provedor de dados: 89
Autores: Bourzama,G; Ouled-Haddar,H; Marrouche,M; Aliouat,A.
ABSTRACT The Metal pollution is one of the major risks in the world nowadays. Iron is an essential metal for growth and proliferation of a vast majority of organisms, but it can be toxic to human health and other living beings in the environment at high concentrations due to its increased industrial activity. Fungi have a remarkable capacity to uptake and detoxify iron metal using different mechanisms such as bioaccumulation. Thus, the aim of this work is to study the ability of iron uptake by the fungal strains isolated from Arcelor Mittal -Annaba- in Algeria. Three strains were screened at high concentration of iron (1 g/l) and their capacity to uptake iron has been studied on Czapek Yeast Agar medium. The amounts of uptaken iron ions were estimated in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungi; Iron; Screening; Toxic; Uptake.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2021000100313

Assessment of micronutrient extractants from soils of Paraná, Brazil
Provedor de dados: 90
Autores: Sarto,Marcos Vinicius Mansano; Steiner,Fábio; Lana,Maria do Carmo.
In Brazil, plant-available micronutrients in the soil can be determined by several chemical extractants, the most common of which are dilute acid and chelating solutions. The purpose of this study was to assess the extractants 0.1 mol L-1 HCl, Mehlich-1, Mehlich-3 and DTPA for analysis of the micronutrients Cu, Zn, Fe, and Mn in soils from the state of Paraná. In samples from 12 soils (0-20 cm layer), wheat was planted (Triticum aestivum), grown for 42 days after emergence, and then bean (Phaseolus vulgaris) for 38 days. At the end of each planting period, the soil was sampled again. All extractants tested to assess the availability of Cu, Zn, Fe, and Mn correlated with each other. The efficiency of the extractants HCl, Mehlich-3 and DTPA in assessing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil analysis; Correlation; Copper; Zinc; Iron; Manganese.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600024

Uptake of iron from different compounds by enteroinvasive Escherichia coli
Provedor de dados: 59
Autores: Dall´Agnol,Monique; Martinez,Marina Baquerizo.
This work aimed the study of acquisition of iron from different compounds by EIEC strains. Seven serotypes were studied (O28ac.H-, O29:H-, O136:H-, O144:H-, O152:H-, O164:H- and O167:H7-), in a total of 31 strains. All serotypes were able to use distinct iron sources: hemin, hematin, hemoglobin, ovotransferin, lactoferrin, transferrin and ferritin.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: EIEC; Iron; Iron uptake.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000200012

Aplicação de cloro orgânico no tratamento de tubogotejador utilizado na irrigação com água ferruginosa - DOI: 10.4025/actasciagron.v32i1.1589
Provedor de dados: 1
Autores: Martins, Cristiani Campos; UFV; Soares, Antonio Alves; UFV; Ramos, Márcio Mota; UFV; Reis, Edvaldo Fialho dos; UFES.
Para avaliar o efeito da cloração orgânica na uniformidade de distribuição de água e na vazão de um tubogotejador com vazão de 2,2 L h-1, foram testados quatro níveis de concentrações de dicloroisocianurato de sódio (N1 = 0, N2 = 15, N3 = 30 e N4 = 45 mg L-1 de cloro livre). As avaliações foram realizadas no início do experimento e a cada 100 horas de funcionamento do sistema, totalizando 8 avaliações. No cálculo da uniformidade de aplicação de água foram utilizados os coeficientes de uniformidade de Christiansen (CUC), de distribuição (CUD) e de emissão (Us). Também se realizou o estudo da vazão e do coeficiente de variação da vazão (CVq). Verificou-se que no nível N1 ocorreram reduções de 23; 30,2 e 8,35%, para o CUC, CUD e Us, respectivamente, sendo que...
Tipo: Pesquisa de campo
Palavras-chave: 5.01.00.00-9    Agronomia cloro; Ferro; Entupimento Irrigação e Drenagem chlorine; Iron; Clogging.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1589

Effect of liming on micronutrient availability to soybean grown in soil under different lengths of time under no tillage
Provedor de dados: 1
Autores: Moreira, Silvino Guimarães; Prochnow, Luís Ignácio; Pauletti, Volnei; Silva, Bruno Montoani; Kiehl, Jorge de Castro; Silva, Carine Gregório Machado.
The effect of liming on the availability of micronutrients to soybean cultivated during different numbers of years under no tillage (NT) was investigated. The treatments consisted of the number of years under NT (three, six, and nine years) and five rates of lime (0, 33, 67 and 100% of the amount calculated to raise soil base saturation to 70%) broadcast on soil surface plus the rate of 100% broadcast with incorporation in the 0-0.20 m layer of a clayey Red Oxisol. Soil and leaf samples were collected at two vegetative stages of the crop (vegetative V4 and blossoming R2). The soil was sampled at depths of 0-0.05, 0.05-0.10, 0.10-0.20, and 0.20-0.30 m. Surface liming had little effect on extractable soil micronutrient and nutrient concentrations in soybean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Iron; Manganese; Zinc; No till Fertilidade do solo.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30691

Exigência líquida de zinco, cobre e ferro para cordeiros em pastejo no semiárido - doi: 10.4025/actascianimsci.v32i3.5883
Provedor de dados: 2
Autores: Mendes, Rodrigo de Souza; UFCG; Silva, Aderbal Marcos de Azevêdo; UFCG; Silva, Guilherme de Lira Sobral; UFCG; Nóbrega, Giovanna Henriques da; UFCG; Lôbo, Katiuscia Menezes; UFCG; Pereira Filho, José Morais; UFCG.
Este trabalho teve por objetivo determinar as exigências líquidas de zinco (Zn), cobre (Cu) e ferro (Fe) de cordeiros Santa Inês em pastejo na região semiárida. Os animais com peso vivo entre 20 e 30 kg apresentaram conteúdo corporal no peso de corpo vazio (PCV) para esses minerais de 60,26 a 76,37 mg kg-1, 10,78 a 16,72 mg kg-1 e 133,44 a 126,98 mg kg-1, respectivamente. Observou-se que com o aumento do PCV, as concentrações de Cu e Zn também aumentavam, enquanto a de Fe diminuía. As exigências líquidas para cordeiros em regime de pastejo variaram de 1,69 a 7,86 mg dia-1 para Cu e 7,20 a 27,4 mg dia-1 para Zn. Os resultados obtidos no presente trabalho, para exigências desses minerais, foram maiores do que as exigências dietéticas recomendadas pelo do NRC...
Tipo: Pesquisa de campo
Palavras-chave: Zootecnia composição corporal; Exigências nutricionais; Ferro; Cobre; Zinco; Exigências dietéticas Zootecnia body composition; Nutritional requirements; Iron; Copper; Zinc; Dietary requirements.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/5883

Azospirillum lipoferum and nitrogen fertilization effect on chlorophyll content, nutrients uptake and biometric properties of Zea mays L.
Provedor de dados: 115
Autores: Davaran-Hagh,Elnaz; Mirshekari,Bahram; Reza-Ardakani,Mohammad; Farahvash,Farhad; Rejali,Farhad.
Integrated nutrient management is a major agronomic practice which brings together all methods to support plants nutritional requirement. However, the interaction of these methods together is very complex and needs to be studied in different climatic conditions. So, the effect of nitrogen fertilizer and Azospirillum lipoferum inoculation on maize (Zea mays L.) growth, yield and nutrients uptake was determined in this study. The hypothesis was that the bacterial inoculation decreases the need for N fertilizer application without reducing plant yield. Therefore, we carried out a factorial experiment in a randomized complete block design with three replications. Nitrogen at 0, 25, 50, 75 and 100 % concentrations of the recommended dose, i.e. 150 kg N ha-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofertilizer; Iron; Nitrogen; Phosphorus; Zinc.
Ano: 2015
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000800006

Hepcidin is a useful biomarker to evaluate hyperferritinemia associated with metabolic syndrome
Provedor de dados: 42
Autores: RAUBER,MARIANA R.; PILGER,DIOGO A.; CECCONELLO,DAIANE K.; FALCETTA,FREDERICO S.; MARCONDES,NATÁLIA A.; FAULHABER,GUSTAVO A.M.
Abstract: Investigation of hyperferritinemia in metabolic syndrome patients represents a diagnostic challenge, but it is essential for the identification of individuals with iron overload. Hepcidin negatively regulates iron absorption and release. An increase in hepcidin occurs when iron levels are sufficient or in inflammatory states, conditions often associated with hyperferritinemia. Hemochromatosis causes hyperferritinemia due to iron overload, but frequently has low hepcidin levels. Our aim was to evaluate biochemical and molecular parameters related to iron metabolism in patients with metabolic syndrome. We evaluated 94 patients with metabolic syndrome according to the International Diabetes Federation criteria in a cross-sectional study....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diagnostic screening; Ferritin; Hepcidin; Iron; Metabolic syndrome.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300803

Mitochondrial DNA damage associated with lipid peroxidation of the mitochondrial membrane induced by Fe2+-citrate
Provedor de dados: 42
Autores: Almeida,Andréa M.; Bertoncini,Clélia R.A.; Borecký,Jiri; Souza-Pinto,Nadja C.; Vercesi,Aníbal E.
Iron imbalance/accumulation has been implicated in oxidative injury associated with many degenerative diseases such as hereditary hemochromatosis, beta-thalassemia, and Friedreich's ataxia. Mitochondria are particularly sensitive to iron-induced oxidative stress - high loads of iron cause extensive lipid peroxidation and membrane permeabilization in isolated mitochondria. Here we detected and characterized mitochondrial DNA damage in isolated rat liver mitochondria exposed to a Fe2+-citrate complex, a small molecular weight complex. Intense DNA fragmentation was induced after the incubation of mitochondria with the iron complex. The detection of 3' phosphoglycolate ends at the mtDNA strand breaks by a 32P-postlabeling assay, suggested the involvement of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iron; Lipid peroxidation; Mitochondria; MtDNA; Oxidative stress.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300010

Iron transportation across the placenta
Provedor de dados: 42
Autores: Oliveira,Claudia M. de; Rodrigues,Marcio N.; Miglino,Maria Angélica.
According to the classification of placental types among animals, the transfer of iron through the placenta can occur via: absorption connected to transferin through the outer surface of the trophoblast in direct contact with circulating maternal blood; absorption of the erythrocytes by the chorionic epithelium in direct contact with accumulation of blood extravased from haemotophagous areas; absorption by the chorionic epithelium in direct contact with iron enriched secretions from the endometrial glands and absorption by extravasations of the blood in the maternal-fetal surface and the subsequent phagocytosis of the erythrocytes by trophoblast cells described in bovine, small ruminants, canine and feline. The function of erythrophagocytosis observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endocitosis; Iron; Phagocytosis; Placental hematoma.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400025

Iron restriction increases myoglobin gene and protein expression in Soleus muscle of rats
Provedor de dados: 42
Autores: SOUZA,JANAINA S. DE; BRUNETTO,ERIKA L.; NUNES,MARIA TEREZA.
ABSTRACT Iron is an important trace element for proper cell functioning. It is present in cytochromes, hemoglobin and myoglobin (Mb), where it binds to oxygen. It is also an electron acceptor in the respiratory chain. Mb is an 18 kDa heme-protein, highly expressed in skeletal muscle and heart. The expression of several genes involved in the metabolism of iron is post-transcriptionally regulated by this element. Iron was shown to interfere with the polyadenylation step, modifying their poly (A) tail length and, as a consequence, their stability and translation rate. The aim of this study was to investigate whether iron supplementation or long and short-term restriction affects Mb gene and protein expression, as well as Mb mRNA poly(A) tail length, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiac muscle; Iron; Myoglobin; Skeletal muscle.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602277

Green speciation of iron using aqueous two-phase system
Provedor de dados: 42
Autores: CAMPOS,RAQUEL A.; PATRÍCIO,PAMELA R.; VARGAS,SILVIA JULIANA R.; SILVA,LUIS HENRIQUE M. DA; HESPANHOL,MARIA C.
Abstract Fe(II) and Fe(III) have distinct chemical and biological functions. Consequently, it is more important to determine the fraction of both oxidation state that knowing the total iron concentration in a sample. However, green methods for iron speciation are still limited. This work uses aqueous two-phase system, a safe alternative to liquid–liquid extraction, to perform the chemical speciation of iron. This method is based on the reaction of Fe(II) with 1,10-phenanthroline extractant, forming a complex of Fe(II)-phenanthroline that concentrates in the top phase of the system. The Fe(III) specie concentrated in the bottom phase of the system. Iron speciation was affected by the electrolyte nature, macromolecule type, quantity of phenanthroline added,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aqueous two-phase system; Flame atomic absorption spectrometry; Iron; Speciation; Green chemistry.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501929

Zinc in the prevention of Fe2initiated lipid and protein oxidation
Provedor de dados: 48
Autores: ZAGO,M. PAOLA; VERSTRAETEN,SANDRA V.; OTEIZA,PATRICIA I.
In the present study we characterized the capacity of zinc to protect lipids and proteins from Fe2+-initiated oxidative damage. The effects of zinc on lipid oxidation were investigated in liposomes composed of brain phosphatidylcholine (PC) and phosphatidylserine (PS) at a molar relationship of 60:40 (PC:PS, 60:40). Lipid oxidation was evaluated as the oxidation of cis-parinaric acid or as the formation of 2-thiobarbituric acid-reactive substances (TBARS). Zinc protected liposomes from Fe2+ (2.5-50 muM)-supported lipid oxidation. However, zinc (50 muM) did not prevent the oxidative inactivation of glutamine synthelase and glucose 6-phosphate dehydrogenase when rat brain superntants were oxidized in the presence of 5 muM Fe2+ and 0.5 mM H2O2 .We also...
Tipo: Journal article
Palavras-chave: Aluminum; Catechins; Free radicals; Iron; Lipid peroxidation; Zinc.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200014

Molecular and pathological basis of aceruloplasminemia
Provedor de dados: 48
Autores: KONO,SATOSHI; MIYAJIMA,HIROAKI.
Aceruloplasminemia is an autosomal recessive neurodegenerative disease characterized by iron accumulation in the brain as well as visceral organs. It is a loss-of-function disorder caused by mutations in the ceruloplasmin gene. Clinically, this disease consists of the triad of adult-onset neurological disease, retinal degeneration and diabetes mellitus. Massive iron accumulation and extensive loss of neurons are observed in the basal ganglia. The elevated iron concentration is associated with increased lipid peroxidation in the brains of aceruloplasminemia patients. Enlarged or deformed astrocytes and spheroid-like globular structures are characteristic neuropathological findings in aceruloplasminemia. Moreover, deformed astrocytes and globular structures...
Tipo: Journal article
Palavras-chave: Ceruloplasmin; Iron; Lipid peroxidation; Mutation.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100003

Effect of iron on the activation of the MAPK/ERK pathway in PC12 neuroblastoma cells
Provedor de dados: 48
Autores: MUÑOZ,PABLO; ZAVALA,GABRIELA; CASTILLO,KAREN; AGUIRRE,PABLA; HIDALGO,CECILIA; NÚÑEZ,MARCO T.
Recent evidence suggests that reactive oxygen species function as second messenger molecules in normal physiological processes. For example, activation of N-Methyl-D-Aspartate receptor results in the production of ROS, which appears to be critical for synaptic plasticity, one of the cellular mechanisms that underlie learning and memory. In this work, we studied the effect of iron in the activation of MAPK/ERK pathway and on Ca2+ signaling in neuronal PC12 cells. We found that iron-dependent generation of hydroxyl radicals is likely to modulate Ca2+ signaling through RyR calcium channel activation, which, in turn, activates the MAPK/ERK pathway. These findings underline the relevance of iron in normal neuronal function.
Tipo: Journal article
Palavras-chave: NMDA receptor; Calcium; Iron; Oxidative stress; MAPK/ERK; Hippocampal slices; Long-term potentiation.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100021

Hereditary hemochromatosis: An opportunity for gene therapy
Provedor de dados: 48
Autores: EZQUER,FERNANDO; NÚÑEZ,MARCO T; ROJAS,ALEJANDRO; ASENJO,JUAN; ISRAEL,YEDY.
Levels of body iron should be tightly controlled to prevent the formation of oxygen radicals, lipoperoxidation, genotoxicity, and the production of cytotoxic cytokines, which result in damage to a number of organs. Enterocytes in the intestinal villae are involved in the apical uptake of iron from the intestinal lumen; iron is further exported from the cells into the circulation. The apical divalent metal transporter-1 (DMT1) transports ferrous iron from the lumen into the cells, while the basolateral transporter ferroportin extrudes iron from the enterocytes into the circulation. Patients with hereditary hemochromatosis display an accelerated transepithelial uptake of iron, which leads to body iron accumulation that results in cirrhosis, hepatocellular...
Tipo: Journal article
Palavras-chave: Iron; Intestine; Hemochromatosis; Gene therapy; HFE; DMT1; Cirrhosis.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100014

Antioxidant responses of cortex neurons to iron loading
Provedor de dados: 48
Autores: AGUIRRE,PABLA; MENA,NATALIA; TAPIA,VICTORIA; ROJAS,ALEJANDRO; ARREDONDO,MIGUEL; NÚÑEZ,MARCO TULIO.
Brain cells have a highly active oxidative metabolism, yet they contain only low to moderate superoxide dismutase and catalase activities. Thus, their antioxidant defenses rely mainly on cellular reduced glutathione levels. In this work, in cortical neurons we characterized viability and changes in reduced and oxidized glutathione levels in response to a protocol of iron accumulation. We found that massive death occurred after 2 days in culture with 10 mM Fe. Surviving cells developed an adaptative response that included increased synthesis of GSH and the maintenance of a glutathione-based reduction potential. These results highlight the fundamental role of glutathione homeostasis in the antioxidant response and provide novel insights into the adaptative...
Tipo: Journal article
Palavras-chave: Glutathione; Iron; Redox response; Cortical neurons; Cell death.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100012

Heme oxygenase 1 overexpression increases iron fluxes in Caco-2 cells
Provedor de dados: 48
Autores: MENDIBURO,MARÍA JOSE; FLORES,SEBASTIÁN; PIZARRO,FERNANDO; ARREDONDO,MIGUEL.
Heme oxygenase-1 is a microsomal enzyme that, when induced by stress, protects the cells from oxidative injury. Heme oxygenase-1 participates in the cleavage of the heme ring producing biliverdin, CO and ferrous Fe. The released Fe becomes part of intracellular Fe pool and can be stored in ferritin or released by an iron exporter. The mechanism by which heme enters cells is not completely understood, although it had been suggested that it might be internalized by an endocytosis process. In this study, we expressed a full-length Heme oxygenase-1 cDNA in Caco-2 cells and measured intracellular iron content, heme-iron uptake and transport and immunolocalization of heme oxygenase-1 in these cells. We found that heme oxygenase-1 expressing cells showed...
Tipo: Journal article
Palavras-chave: Iron; Heme; Heme oxygenase; Caco-2 cells.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100023

Homeostatic and toxic mechanisms regulating manganese uptake, retention, and elimination
Provedor de dados: 48
Autores: ROTH,JEROME A.
This review attempts to summarize and clarify our basic knowledge as to the various factors that potentially influence the risks imposed from chronic exposure to high atmospheric levels of manganese (Mn). The studies describe the interrelationship of the different systems in the body that regulate Mn homeostasis by characterizing specific, biological components involved in its systemic and cellular uptake and its elimination from the body. A syndrome known as manganism occurs when individuals are exposed chronically to high levels of Mn, consisting of reduced response speed, intellectual deficits, mood changes, and compulsive behaviors in the initial stages of the disorder to more prominent and irreversible extrapyramidal dysfunction resembling Parkinson's...
Tipo: Journal article
Palavras-chave: Manganese; Iron; Lung; Parkinson's disease; Divalent metal transporter (DMT1); Transferrin; Transferrin receptor.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602006000100006

Response of Paenibacillus polymyxa to iron: alternations in cellular chemical composition and the production of fusaricidin type antimicrobial compounds
Provedor de dados: 52
Autores: Raza,Waseem; Hongsheng,Wu; Qirong,Shen.
In this work, growth, cellular chemical composition and production of fusaricidin type antimicrobial compounds by P. polymyxa SQR-21 were compared in tryptone broth supplemented with four concentrations of iron (25, 50, 100 and 200 µM). The data revealed that the growth of P. polymyxa SQR-21 was increased by 3-8% with the increase in concentration of ferric ion (Fe3+). The production of fusaricidin type compounds was increased by 33-49% only up to 50 µM Fe3+ and the highest level of Fe3+ was inhibitory. Increase in the liquid culture Fe3+concentration increased the intracellular protein (2%), intracellular carbohydrate (14%), extracellular protein (7%) and polysaccharide contents (18%) while the intracellular lipid contents were increased (11%) only up to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Fusaricidin; Iron; Paenibacillus polymyxa; RNA.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000500019

Influence of iron deprivation on virulence traits of mycobacteria
Provedor de dados: 55
Autores: Pal,Rahul; Hameed,Saif; Sharma,Sharda; Fatima,Zeeshan.
ABSTRACT Novel strategies to combat the ever increasing burden of drug resistance in Mycobacterium tuberculosis (MTB) causing tuberculosis (TB) remains a global concern. The ability of MTB to sense and adapt to restricted iron conditions in the hostile environment is essential for their survival and confers the basis of their success as dreadful pathogen. The striking and clinically relevant virulence trait of MTB is its ability to form biofilms and adhere to the host cells. The present study elucidated the effect of iron deprivation on biofilm formation and cell adherence of Mycobacterium smegmatis, a non-pathogenic surrogate of MTB. Firstly, we showed that iron deprivation leads to enhanced cell sedimentation rate and altered colony morphology depicting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iron; Morphology; Biofilm; Anti-TB drugs.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000600585

Lipid peroxidation, antioxidant enzymes and glutathione levels in human erythrocytes exposed to colloidal iron hydroxide in vitro
Provedor de dados: 56
Autores: Ferreira,A.L.A.; Machado,P.E.A.; Matsubara,L.S.
The free form of the iron ion is one of the strongest oxidizing agents in the cellular environment. The effect of iron at different concentrations (0, 1, 5, 10, 50, and 100 µM Fe3+) on the normal human red blood cell (RBC) antioxidant system was evaluated in vitro by measuring total (GSH) and oxidized (GSSG) glutathione levels, and superoxide dismutase (SOD), catalase, glutathione peroxidase (GSH-Px) and reductase (GSH-Rd) activities. Membrane lipid peroxidation was assessed by measuring thiobarbituric acid reactive substance (TBARS). The RBC were incubated with colloidal iron hydroxide and phosphate-buffered saline, pH 7.45, at 37oC, for 60 min. For each assay, the results for the control group were: a) GSH = 3.52 ± 0.27 µM/g Hb; b) GSSG = 0.17 ± 0.03...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catalase; Superoxide dismutase; Glutathione; Iron; Erythrocyte; Thiobarbituric acid reactive substance.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000600004

Comments on the paper "High doses of riboflavin and the elimination of dietary red meat promote the recovery of some motor functions in Parkinson's disease patients. C.G. Coimbraand V.B.C. Junqueira. Brazilian Journal of Medical and Biological Research, 36: 1409-1417, 2003"
Provedor de dados: 56
Autores: Ferraz,H.B.; Quagliato,E.A.B.; Rieder,C.R.M.; Silva,D.J.; Teive,H.A.G.; Barbosa,E.R.; Cardoso,F.; Limongi,J.C.P.; Bezerra,J.M.F.; Andrade,L.A.F.; Allam,N.; Prado,R.C.P.; Tomas,V.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Parkinson's disease; Riboflavin; FAD; Glutathione; Iron; Hemin.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000900002

High doses of riboflavin and the elimination of dietary red meat promote the recovery of some motor functions in Parkinson's disease patients
Provedor de dados: 56
Autores: Coimbra,C.G.; Junqueira,V.B.C.
Abnormal riboflavin status in the absence of a dietary deficiency was detected in 31 consecutive outpatients with Parkinson's disease (PD), while the classical determinants of homocysteine levels (B6, folic acid, and B12) were usually within normal limits. In contrast, only 3 of 10 consecutive outpatients with dementia without previous stroke had abnormal riboflavin status. The data for 12 patients who did not complete 6 months of therapy or did not comply with the proposed treatment paradigm were excluded from analysis. Nineteen PD patients (8 males and 11 females, mean age ± SD = 66.2 ± 8.6 years; 3, 3, 2, 5, and 6 patients in Hoehn and Yahr stages I to V) received riboflavin orally (30 mg every 8 h) plus their usual symptomatic medications and all red...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parkinson's disease; Riboflavin; Flavin-adenine dinucleotide; Glutathione; Iron; Hemin.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001000019

Hydrogen peroxide induces a specific DNA base change profile in the presence of the iron chelator 2,2’ dipyridyl in Escherichia coli
Provedor de dados: 56
Autores: Felício,D.L.; Almeida,C.E.B.; Silva,A.B.; Leitão,A.C.
Pretreatment of Escherichia coli cultures with the iron chelator 2,2’-dipyridyl (1 mM) protects against the lethal effects of low concentrations of hydrogen peroxide (&lt;15 mM). However, at H2O2 concentrations equal to or greater than 15 mM, dipyridyl pretreatment increases lethality and mutagenesis, which is attributed to the formation of different types of DNA lesions. We show here that pretreatment with dipyridyl (1 mM) prior to challenge with high H2O2 concentrations (≥15 mM) induced mainly G:C→A:T transitions (more than 100X with 15 mM and more than 250X with 20 mM over the spontaneous mutagenesis rate) in E. coli. In contrast, high H2O2 concentrations in the absence of dipyridyl preferentially induced A:T→T:A transversions (more than 1800X and more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrogen peroxide; Dipyridyl; Mutagenesis; Iron; Fenton reaction.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001100003

Influence of iron and copper on the activity of laccases in Fusarium oxysporum f. sp. lycopersici
Provedor de dados: 58
Autores: Hernández-Monjaraz,Wendy Susana; Caudillo-Pérez,César; Salazar-Sánchez,Pedro Ulises; Macías-Sánchez,Karla Lizbeth.
ABSTRACT Fusarium oxysporum f. sp. lycopersici is a phytopathogenic fungus that causes vascular wilt in tomato plants. In this work we analyze the influence of metal salts such as iron and copper sulphate, as well as that of bathophenanthrolinedisulfonic acid (iron chelator) and bathocuproinedisulfonic acid (copper chelator) on the activity of laccases in the intra (IF) and extracellular fractions (EF) of the wild-type and the non-pathogenic mutant strain (rho1::hyg) of F. oxysporum. The results show that laccase activity in the IF fraction of the wild and mutant strain increased with the addition of iron chelator (53.4 and 114.32%; respectively). With copper, it is observed that there is an inhibition of the activity with the addition of CuSO4 for the EF...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chelators; Cooper; Fusarium; Iron; Laccases.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000500269

Iron-depletion prevents biofilm formation in Pseudomonas aeruginosa through twitching motility and quorum sensing
Provedor de dados: 58
Autores: Cai,Yun; Wang,Rui; An,Mao-Mao; Bei-Bei,Liang.
Influence of iron-depletion on twitching motility and quorum sensing (QS) system in P. aeruginosa was evaluated. The results demonstrated iron-depletion can retard biofilm formation and increase the twitching motility and expression of QS-related genes, suggesting a potential interaction between twitching motility and QS system in P. aeruginosa biofilm formation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iron; Biofilm; Twitching motility; Quorum sensing.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100008

Identification of genes expressed by Cryptococcus gattii during iron deprivation
Provedor de dados: 58
Autores: Paula,Daphine Ariadne Jesus de; Silva,Lívia Kmetzsch Rosa e; Staats,Charley Christian; Vainstein,Marilene H.; Joanoni,Ana Lúcia Pinto; Nakazato,Luciano; Dutra,Valéria.
Cryptococcus neoformans and C. gattii are pathogenic yeasts that cause life-threatening diseases in humans and animals. Iron is an essential nutrient for virtually every organism as it functions as a cofactor in numerous essential enzymatic reactions. In the literature, the competition for iron between microbes and mammalian hosts during infection is well documented. In this study, we used representational difference analysis (RDA) in order to gain a better understanding of how C. gattii responds to iron starvation. A total of 15 and 29 genes were identified as having altered expression levels due to iron depletion after 3 h and 12 h, respectively. Of these, eight genes were identified in both libraries. The transcripts were related to many biological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cryptococcus gattii; Iron; Representational difference analysis; Yeast.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000300008

Promotion of iron nutrition and growth on peanut by Paenibacillus illinoisensis and Bacillus sp. strains in calcareous soil
Provedor de dados: 58
Autores: Liu,Di; Yang,Qianqian; Ge,Ke; Hu,Xiuna; Qi,Guozhen; Du,Binghai; Liu,Kai; Ding,Yanqin.
ABSTRACT This study aimed to explore the effects of two siderophore-producing bacterial strains on iron absorption and plant growth of peanut in calcareous soil. Two siderophore-producing bacterial strains, namely, YZ29 and DZ13, isolated from the rhizosphere soil of peanut, were identified as Paenibacillus illinoisensis and Bacillus sp., respectively. In potted experiments, YZ29 and DZ13 enhanced root activity, chlorophyll and active iron content in leaves, total nitrogen, phosphorus and potassium accumulation of plants and increased the quality of peanut kernels and plant biomass over control. In the field trial, the inoculated treatments performed better than the controls, and the pod yields of the three treatments inoculated with YZ29, DZ13, and YZ29 +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant growth-promoting rhizobacteria; Peanut; Paenibacillus illinoisensis; Siderophores; Iron.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000400656

Dextran iron in anemic lambs: effects on reticulocytosis and free radical production
Provedor de dados: 65
Autores: Rocha,Ricardo Xavier da; Bondan,Carlos; Marinho,Roberto; Lopes,Sônia Terezinha dos Anjos; Cecim,Marcelo.
Anemia due to worm infection is a major cause of loss in the sheep industry, due to deaths, drop in average daily gains and long recovery time following treatment. The present experiment was aimed at evaluating the oxidative status and the recovery of red blood cell (RBC) profile in lambs with induced anemia by bleeding, treated or not with dextran iron. Ten ram lambs 5 to 7 months old were used. Blood samples were drawn every other day and when reached packed cell volume (PCV) of 15% were randomly allocated (day zero) to one of the experimental groups. Treated group received a single dose of 25mg per kg body weight of a commercial formulation of dextran iron, the control group received no treatment. Blood samples were taken on days 0, 7, 14, and 21 after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TBARS; NPTH; Lambs; Free-radicals; Iron.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782007000500019

Micronutrient concentration in potato clones with distinct physiological sensitivity to Al stress
Provedor de dados: 65
Autores: Tabaldi,Luciane Almeri; Castro,Gabriel Y; Cargnelutti,Denise; Skrebsky,Etiane Caldeira; Gonçalves,Jamile Fabbrin; Rauber,Renata; Rossato,Liana; Schetinger,Maria Rosa Chitolina; Bisognin,Dílson Antônio; Nicoloso,Fernando Teixeira.
The objective of this study was to evaluate the effects of aluminum (Al) on the zinc (Zn), manganese (Mn), iron (Fe) and copper (Cu) concentrations in four potato clones (Macaca and Dakota Rose: both Al-sensitive clones; and SMIC148-A and Solanum microdontum: both Al-tolerant-clones), grown in a nutrient solution (pH 4.00) with 0, 50, 100, 150 and 200mg Al L-1. Root Zn and Fe concentrations decreased linearly with the increase of Al levels in Macaca, SMIC148-A and Dakota Rose and increased linearly in S. microdontum. Shoot Zn concentration showed a quadratic relationship with Al in S. microdontum and SMIC148-A, but a curvilinear response in Dakota Rose. Shoot Fe concentration showed a quadratic relationship with Al in S. microdontum, SMIC148-A and Dakota...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Solanum microdontum; Zinc; Manganese; Iron; Copper.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000200010