Consulta: subjectFacets:"Molybdenum"
Registros recuperados: 19
Data/hora: 10/06/2024 00:50:39

Girassol: nutricao mineral e adubacao.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
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

Molibdenio e cobalto na cultura da soja.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: SFREDO, G. J.; BORKERT, C. M.; LANTMANN, A. F.; MEYER, M. C.; MANDARINO, J. M. G.; OLIVEIRA, M. C. N. de.
bitstream/item/35355/1/1997-Circular-Tecnica.n.16-Mo-e-Co-1475x21-09.05.2011-OK.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Micronutriente; Brasil; Parana; Maraanhao.; Adubação; Cobalto; Cerrado; Molibdênio; Soja.; Cobalt; Fertilizer application; Brazil; Molybdenum; Savannas; Soybeans; Trace elements.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/459840

Micronutrientes para a cultura da soja no Estado do Parana: zinco e molibdenio.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: LANTMANN, A. F.; CAMPO, R. J.; SFREDO, G. J.; BORKERT, C. M.
bitstream/item/35344/1/1985-Comunicado-Tecnico.n.34.Micronutrientes-18x26-OK.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Micronutriente do solo; Brasil; Parana; Micronutrient; Soybean.; Molibdênio; Soja; Zinco.; Brazil; Molybdenum; Soil; Zinc.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445462

Reexamination of analytical methods for Al and Mo in plant material.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: ISHIZUKA, J.; MESQUITA FILHO, M. V. de.
bitstream/item/192045/1/ID06911-CRI1613.pdf
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Aluminium; Plants; Brasil; Japão; BIBJICACPAC.; Alumínio; Análise; Cerrado; Molibdênio; Planta; Pesquisa; Cooperação Internacional; Analytical methods; Molybdenum.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549938

Regulation of nitrogen fixation from free-living organisms in soil and leaf litter of two tropical forests of the Guiana shield
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Van Langenhove, Leandro; Depaepe, Thomas; Vicca, Sara; Van Den Berge, Joke; Stahl, Clement; Courtois, Elodie; Weedon, James; Urbina, Ifigenia; Grau, Oriol; Asensio, Dolores; Peñuelas, Josep; Boeckx, Pascal; Richter, Andreas; Van Der Straeten, Dominique; Janssens, Ivan A.
Background and aims Biological fixation of atmospheric nitrogen (N2) is the main pathway for introducing N into unmanaged ecosystems. While recent estimates suggest that free-living N fixation (FLNF) accounts for the majority of N fixed in mature tropical forests, the controls governing this process are not completely understood. The aim of this study was to quantify FLNF rates and determine its drivers in two tropical pristine forests of French Guiana. Methods We used the acetylene reduction assay to measure FLNF rates at two sites, in two seasons and along three topographical positions, and used regression analyses to identify which edaphic explanatory variables, including carbon (C), nitrogen (N), phosphorus (P) and molybdenum (Mo) content, pH, water...
Tipo: Text
Palavras-chave: Free-living nitrogen fixation; Tropical forest; French Guiana; Nutrients; Phosphorus; Molybdenum.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59901/63083.pdf

Silicate electrochemical measurements in seawater: Chemical and analytical aspects towards a reagentless sensor
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lacombe, Marielle; Garcon, Veronique; Thouron, Daniele; Le Bris, Nadine; Comtat, Maurice.
From the study of molybdenum oxidation in aqueous solutions we developed a semi-autonomous method to detect silicate in aqueous samples. Molybdenum oxidation was used to form molybdate in acidic media. The silicomolybdic complex formed with silicate is detectable by amperometry or cyclic voltammetry. The new electrochemical method is in good agreement with the method conventionally used for environmental water silicate analysis. In the second stage, a completely reagentless method was developed using molybdate and proton produced during molybdenum oxidation. Reproducibility tests show a precision of 2.6% for a concentration of 100 mu mol L-1. This new method will be Very Suitable for the development of new autonomous silicate sensors easy to handle and...
Tipo: Text
Palavras-chave: Cyclic voltammetry; Amperometry; Reagentless; Silicate; Molybdenum.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6114.pdf

Composition des isotopes stables du molybdène dans les carbonates du Précambrien : affinement du proxy et applications paléo-environnementales
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Thoby, Mary.
The redox conditions of the oceans evolved considerably during the Precambrian. This is mainly due to the arrival of the oxygen, at first generating oxygen oases, and then accumulating in the atmosphere during the Great Oxidation Event (GOE) ca. 2.45 Ga. However, the earliest traces of free oxygen during these periods, and the mechanisms of their sedimentary expression, remain poorly understood. For over a decade, the isotopic composition of molybdenum (δ98Mo) in sediments has been used as a global marine redox proxy.An elemental and isotopic study of the different phases constituting carbonate rocks was carried out using sequential digestions performed on carbonates of different ages and depositional environments. The results show that Mo is primarily...
Tipo: Text
Palavras-chave: Redox; Précambrien; Carbonates; Molybdène; Isotopes; Attaque séquentielle; Sequential digestion; Precambrian; Molybdenum.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00663/77462/79129.pdf

Trace element systematics in cold seep carbonates and associated lipid compounds
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Wang, Xudong; Bayon, Germain; Kim, Jung-hyun; Lee, Dong-hun; Kim, Dahae; Guéguen, Bleuenn; Rouget, Marie-laure; Barrat, Jean-alix; Toffin, Laurent; Feng, Dong.
Seeping of methane-rich fluids at submarine cold seeps drives intense microbial activity and precipitation of authigenic carbonates. Some trace elements play an important role in the biogeochemical processes operating at cold seeps, especially as specific enzymatic co-factors related to methanogenesis and the anaerobic oxidation of methane (AOM). However, it is unclear whether microbial trace metal utilization can be traced by the geochemical composition of seep carbonates. In this study, we analyzed a series of authigenic carbonate samples recovered from various seep settings worldwide and report for the first time trace element concentrations for total lipid fractions, combined with biomarker analyses and determination of elemental abundances in...
Tipo: Text
Palavras-chave: Seep carbonate; Lipid compounds; Trace elements; Tungsten; Nickel; Cobalt; Molybdenum.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00511/62311/66562.pdf

Source and development of large manganese enrichments above eastern Mediterranean sapropel S1
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Reitz, Anja; Thomson, John; De Lange, Gert J.; Hensen, Christian.
[ 1] The residual dark unit of the most recent eastern Mediterranean sapropel (S1) is usually overlain by sediments with enhanced concentrations of MnO(x) in two separated layers. The variability and magnitude of the Mn enrichment at different locations and water depths indicate that Mn must have been added preferentially to sediments at intermediate ( 1 - 2 km) water depths. We propose a two-stage mechanism for the Mn enrichment that involves decreasing oxygenation with increasing water depth. This mechanism involves the loss of reduced Mn(2+) from the deepest sediments (&gt; 2 km water depth) into overlying anoxic waters and a variable gain of MnOx in sediments in contact with oxygenated waters at shallower depth. In the S1 unit that receives the extra...
Tipo: Text
Palavras-chave: Manganese; Sapropel S1; Eastern Mediterranean; Molybdenum; Lithium.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00234/34529/33426.pdf

Effects of micronutrients on growth and yield of pigeonpea
Provedor de dados: Open Acess Agriculture Research Repository
Autores: Malla Reddy,M.
Palavras-chave: Pigeonpeas; Boron; Seed treatment; Inorganic acid salts; Molybdenum; Soil sciences; Genetic soil types; Chickpeas; Grain legumes; Rhizobium.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3336

Seeds enriched with phosphorus and molybdenum improve the contribution of biological nitrogen fixation to common bean as estimated by 15n isotope dilution
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Chagas,Eduardo; Araújo,Adelson Paulo; Alves,Bruno José Rodrigues; Teixeira,Marcelo Grandi.
Seeds with a high concentration of P or Mo can improve the growth and N accumulation of the common bean (Phaseolus vulgaris L.), but the effect of enriched seeds on biological N2 fixation has not been established yet. This study aimed to evaluate the effect of seeds enriched with P and Mo on growth and biological N2 fixation of the common bean by the 15N isotope dilution technique. An experiment was carried out in pots in a 2 x 3 x 2 x 2 factorial design in randomized blocks with four replications, comprising two levels of soil applied P (0 and 80 mg kg-1), three N sources (without N, inoculated with rhizobia, and mineral N), two seed P concentrations (low and high), and two seed Mo concentrations (low and high). Non-nodulating bean and sorghum were used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molybdenum; Nodulation; Phaseolus vulgaris.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400009

Peanut response to lime and molybdenum application in low pH soils
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Quaggio,J. A.; Gallo,P. B.; Owino-Gerroh,C.; Abreu,M. F.; Cantarella,H.
Liming acid soils is considered to assure the availability of Mo in crops. Additionally, in peanuts (Arachis hypogaea L.) the positive response to liming is associated to a better supply of Ca+2, Mo for the nitrogenase-complex activity, and other non-nitrogen fixing activities of the crop. This study was thus undertaken to assess the effect of lime, Mo, and the lime-Mo interaction on peanut crop, on an acid Ultisol at the Mococa Experimental Station, Instituto Agronômico, São Paulo State, Brazil, from 1987 to 1990. A randomized complete block design with four replications, in a 4 x 4 factorial arrangement, was used in the study. The factors included four lime rates (0, 2, 4, and 6 t ha-1) broadcast and incorporated into the soil, and Mo (0, 100, 200, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hypogaea; Liming; Molybdenum; Nitrogen fixation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832004000400008

PHOSPHORUS-MOLYBDENUM RELATIONSHIP IN SOIL AND RED CLOVER (Trifolium pratense L.) ON AN ACID ANDISOL
Provedor de dados: Revista de la Ciencia del Suelo y Nutrición Vegetal
Autores: Ribera,Alejandra E; Mora,Maria de la Luz; Ghiselini,Vanessa; Demanet,Rolando; Gallardo,Felipe.
We studied the phosphorous (P) and molybdenum (Mo) relationship in soil and red clover (Trifoliumpratense L.) in a non limed and limed acid Andisol of Southern Chile. In soil, we evaluated the effect of different liming (0 and 2000 mg kg-1), P (0, 200 and 400 mg kg-1), and Mo (0, 0.58 and 0.96 mg kg-1) doses supply on soil available Mo. In addition, the availability of P and Calcium (Ca) in treated soils was determinated. In red clover, we studied the Mo and P shoot concentrations and dry matter yield in response to the different treatments applied to the soil. Also, we measured the changes produced by Mo uptake in shoot Cu concentrations. The results showed that both, lime and more strongly P and Mo additions significantly (P &amp;#8805; 0.05) increased...
Tipo: Journal article
Palavras-chave: Phosphorous; Molybdenum; Andisol; Red clover.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000100008

Nitrate reductase activity in leaves and stems of tanner grass (Brachiaria radicans Napper)
Provedor de dados: Scientia Agricola
Autores: Cazetta,Jairo Osvaldo; Villela,Luciana Cristine Vasques.
Tanner grass (Brachiaria radicans Napper) is a forage plant that is adapted to well-drained soils or wetlands, and responds well to nitrogen (N) fertilization. The assimilation of N involves the nitrate reductase (NR) enzyme, and its activity seems to be dependent on N supply. Molybdenum (Mo) is also important because it is a cofactor of NR. In this study, the variables of an in vivo assay were optimized for measuring nitrate reductase activity (NRA) in the leaves and stem tissues. This method was used to evaluate NO3- metabolism in plants fertilized with NaNO3, NH4Cl or urea, in association with or without application of H2MoO4, aiming to provide guidelines for N management of this species. The best conditions to determine NRA involved the incubation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria arrecta; Nitrogen; Molybdenum; Enzyme.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600012

Bean cultivation in a subsistence farming system in the northeast of São Paulo state - Brazil
Provedor de dados: Scientia Agricola
Autores: Oliveira,Wladecir Salles de; Tsai,Siu Mui.
The colonization of the State of São Paulo, Brazil of the northeastern region, is related to historical movements, such as "tropeirismo" (séc. XVIII and XIX) and Italian immigration (séc. XIX). The agriculture presently practices used by farmers descendent of immigrants does not differ from the techniques used at the beginning of the century. In the Cunha region of the Atlantic Rain Forest ecosystem poor bean yield associated with low fertilizer input, plant disease and soil erosion led to slash-and-burn farming. This work is an attempt at identifying sustainable farming practices that would minimize bean disease and maximize nitrogen assimilation. For that purpose soil fertility and plant cultivar were studied under standard agronomic practices to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Rhizobium tropici; Landrace; Lime; Molybdenum.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200008

Physiological and genotoxic effects of molybdenum-induced copper deficiency in cattle
Provedor de dados: Agrociencia
Autores: Picco,Sebastián; Ponzzinibio,M. Virginia; Mattioli,Guillermo; Rosa,Diana; Minatel,Leonardo; Fazzio,Luis; Seoane,Analía.
Molybdenosis is a disease caused by the depressing effect of molybdenumn (Mo) on the physiological availability of Copper (Cu). The present study was carried out in order to analyze the ability of Mo to cause damage on the DNA integrity and changes in membrane fatty acids by oxidative damage. Holstein male calves were fed a Mo-supplemented diet for 9 months. Variables evaluated were plasma Cu concentration, erythrocyte Cu content and SOD activity, comet assay and analysis of the fatty acid composition of erythrocyte membranes. The statistical design was a completely randomized with one single factor and two replications. Copper plasma concentration, erythrocyte copper concentration and Cu/Zn SOD activity were analyzed using the t test. Chi-square test was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molybdenum; Copper deficiency; Oxidative damage; DNA damage; Bos taurus; SOD activity.
Ano: 2012
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952012000200002

Biodistribution of 99Mo in rats
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Souza,Raphael Sancho Sisley de; Ribeiro,Bianca da Silva; Dantas,Ana Letícia Almeida; Bernardo Filho,Mario; Dantas,Bernardo Maranhão.
The modification of 99Mo standard metabolism in the presence of MDP would alter the dosimetry of this radionuclide in nuclear medicine patients. Therefore, the objective of this work is to evaluate the influence of MDP in the biodistribution of 99Mo. Wistar rats were divided in two groups of six animals, being inoculated respectively 99Molibdate and 99Mo+MDP via plex ocular. The biodistribution study was carried out after 10 and 120 minutes respectively. The organs were counted with a NaI(Tl) detector. The uptake values did not present significant differences among the groups. An in vitro study through planar chromatography was carried out to determine the affinity between molybdenum and MDP. The results show that 99Mo has low affinity both to propanone...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wistar; Molybdenum; Nuclear Medicine.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000700029

Control of Acid Phosphatases Expression from Aspergillus niger by Soil Characteristics
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Nahas,Ely.
ABSTRACTThis work studied the acid phosphatase (APase) activity from culture medium (extracellular, eAPase) and mycelial extract (intracellular, iAPase) ofAspergillus niger F111. The influence of fungus growth and phosphate concentration of the media on the synthesis and secretion of phosphatase was demonstrated. The effects of pH, substrate concentration and inorganic and organic compounds added to the reaction mixture on APase activity were also studied. Both enzymes were repressed by high concentrations of phosphate. Overexpression of iAPase in relation to eAPase was detected; iAPase activity was 46.1 times higher than eAPase. The maximal activity of eAPase was after 24h of fungus growth and for iAPase was after 96h. Optimal pH and substrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzyme inhibitors; Molybdenum; Overexpression; Phosphate; Soil chemical characteristics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500658

Relationship between Paratuberculosis and the microelements Copper, Zinc, Iron, Selenium and Molybdenum in Beef Cattle
Provedor de dados: Brazilian Journal of Microbiology
Autores: Paolicchi,F.; Perea,J.; Cseh,S.; Morsella,C.
To study the deficiency of minerals and its relationship with Paratuberculosis, blood, serum, and fecal samples were obtained from 75 adult bovines without clinical symptoms of the disease and from two bovines with clinical symptoms of the disease, from two beef herds with a previous history of Paratuberculosis in the Province of Buenos Aires, Argentina. Serum samples were processed by ELISA and feces were cultured in Herrolds medium. Copper, zinc and iron in serum were quantified by spectrophotometry and selenium was measured by the activity of glutathione peroxidase. We also determined copper, zinc, iron and molybdenum concentrations in pastures and the concentration of sulfate in water. Mycobacterium avium subsp paratuberculosis (Map) was isolated from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paratuberculosis; Micronutrients; Selenium; Molybdenum; Copper.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000100022