Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 14 )

2018 ( 18 )

2017 ( 9 )

2016 ( 3 )

Custom range...

Search Results: 1 - 10 of 4412 matches for " Edson Marcio Mattiello Mattiello "
All listed articles are free for downloading (OA Articles)
Page 1 /4412
Display every page Item
Solubilization of Bayóvar Natural Phosphate Rock under the Drain Effect of Calcium and Phosphorus at Two Levels of Acidity  [PDF]
Sarah Vieira Novais, Edson Marcio Mattiello, Leonardus Vergutz, Elizio Ferreira Frade Junior, Roberto Ferreira Novais
Open Journal of Soil Science (OJSS) , 2017, DOI: 10.4236/ojss.2017.78013
Abstract: Natural phosphate rock (NP) solubilization in soils is dependent on the soil pH and its power to remove or drain (sink effect) P and Ca of the solution that is in equilibrium with the NP. The aim of this work was to evaluate the effect of acidity and P- and Ca-sinks on the solubilization of bayóvar reactive rock phosphate (a phosphorite). Samples of this NP in aqueous suspension were placed in a cassette (Slide-A-Lyzzer G2 Dialysis Cassette) compartment and immersed in a beaker containing 150 mL of an aqueous solution with pH adjusted at 4.5 or 6.0, where P- and Ca-sinks individually or in their combinations, were applied. The tested sinks were: Anionic Resin (AR); Cationic Resin (CR); Mixed Resin (MR: AR + CR); Goethite (Goe); Goe + AR; Goe + CR and one control (NP only) in five replicates. Beakers (experimental units) were shaken for 12 h daily, at 130 rpm, until completing 30 days of equilibrium. The suspensions were filtered to extract solution-P from the residue on the filter paper; the labile-P was extracted from this residue using 0.8 mol·L-1 NH4Cl in 2 mol·L-1 HCl and, finally, the remainder P in the same residue together with the filter paper were subjected to nitric-perchloric acid digestion, to determine the P-residual in the extract. Goe caused greater solubilization of the NP, indicating that this P-sink was more effective than AR, causing similar or greater solubilization than CR. AR and CR, in a similar way, significantly restricted the trait characteristic of Goe (p < 0.05), at both pH values, in the solubilization of NP. Although Goe generally caused greater solubilization of the NP, it also caused the lower formation of labile-P. The CR presented, in general, the highest contents of solution-P, thus it triggered solubilization of NP without the immobilization of the solution-P, unlike the one with the AR that adsorbs it. In the lower pH condition (4.5), the solubilization of NP tended to be higher than at pH 6.0, although in a little effective way, compared to the effects of the sinks.
Potassium supplying capacity of soils from Minas Gerais-Brazil Capacidad de aportación de potasio en suelos de Minas Gerais, Brasil Capacidade de suprimento de potássio em solos de Minas Gerais-Brasil
Edson Marcio Mattiello Mattiello,Arlindo Ferreira Faria Arlindo,Vitor Hugo Alvarez V.,Julio Cesar Lima Neves
Spanish Journal of Soil Science , 2012, DOI: 10.3232/sjss.2012.v2.n1.02
Abstract: Potassium is present in distinct forms in the soil. The K forms in the soil are characterized by reversible exchanges between compartments and they have different characteristics in regards to availability for plant uptake. The soil's capacity to supply or restrict K to plants is different for each soil and it determines the sustainability of agricultural production and fertilization management. Thus, the goal of this study was to evaluate the K supplying capacity of soils of different mineralogies from Minas Gerais (Brazil), under successive corn cultivation. A greenhouse experiment was carried out in factorial 7 x 6 (seven soils and six rates of K), in a randomized complete block design, with four replications. The corn plants were cultivated during 45 days for seven successive crop cycles in pots. The potassium availability in the soil was evaluated at the beginning and at the end of each crop cycle using Mehlich-1 and Mehlich-3 extractors. All treatments showed significant decreases in soil K content, which affected corn dry matter accumulation. The reserve of K was highest in Ultisols followed by Inceptisols and Oxisols. Contribution of non-exchangeable potassium to the plant nutrition was observed. The K availability in soil measured by Mehlich-1 represented 40% of K uptake by plants, and 61% of K uptake when Mehlich-3 was used. El potasio está presente en diferentes formas en el suelo, con distinta accesibilidad para las plantas pero con reversibilidad entre ellas. La capacidad de los suelos en la aportación de K para las plantas es diferente y determinante en la sustentabilidad de la producción agrícola y en el manejo de la fertilización con este nutriente. El objetivo de este trabajo fue determinar la capacidad de aportación de K de suelos del Estado de Minas Gerais (Brasil), con diferente mineralogía, en cultivos sucesivos de maíz. El experimento, con un esquema factorial 7 × 6 (siete suelos y seis dosis de K), fue llevado a cabo en invernadero en bloques al azar, con cuatro repeticiones, durante siete cultivos sucesivos. En cada cultivo las plantas fueron cosechadas a los 45 días de su emergencia. La disponibilidad de K para las plantas fue determinada al inicio y entre cada cultivo con los extractores Mehlich-1 y Mehlich-3. Se verificó una expresiva reducción de las concentraciones de K en los suelos, comprometiendo la producción de materia seca de las plantas de maíz en todos los suelos estudiados. La reserva de K fue mayor en los Ultisoles, seguidos de los Inceptisoles y de los Oxisoles. Se observó la participación de formas no intercambiab
Uso da técnica HRICP-MS na avalia??o dos isótopos de boro em eucalipto
Mattiello, Edson Marcio;Ruiz, Hugo Alberto;Silva, Ivo Ribeiro da;Sarkis, Jorge Eduardo de Souza;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000300025
Abstract: the 10b isotope tracer technique is essential to study the b mobility in plants. factors that can influence the quality of measured b isotope ratios were optimized experimentally using high resolution inductively coupled plasma mass spectrometry (hricp-ms). an isotopically certified standard (nist srm-951) was used. the best combination was obtained using a resolution of 400, a rf power of 1250 w, followed by 15 measurements over a 10-s integration period each (15*10). utilizing this approach it was possible to obtain a precision of 0.3 % in standard material and 2z % in the experimental samples. the results show the importance of establishing optimized work conditions before carrying out the analytical series.
Produ??o de matéria seca, crescimento radicular e absor??o de cálcio, fósforo e alumínio por coffea canephora e coffea arabica sob influência da atividade do alumínio em solu??o
Mattiello, Edson Marcio;Pereira, Marcos Gervasio;Zonta, Everaldo;Mauri, Jocimar;Matiello, José Dioenis;Meireles, Paulo Geovane;Silva, Ivo Ribeiro da;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000100040
Abstract: this study had the objective of evaluating the dry matter production, root growth, and the absorption and distribution of ca, p and al in the leaves, stem and roots of two conilon (coffea canephora) coffee clones (mtl 25 and mtl 27) and the coffee variety catuaí amarelo (coffea arabica) grown in nutrient solution with increasing al3+ activity. the plants were cultivated in 5 l pots, containing modified hoagland & arnold nutrient solution. after eight days of adaptation, the plants were subjected to al concentrations of 0, 500, 1.000 and 2.000 mol l-1, which corresponded to al3+ activities of 20.68, 50.59, 132.9, and 330.4 mmol l-1, respectively in solution, estimated by the program geochem. the ca, al and p contents were quantified. the root system was separated to estimate area and length. the variety catuaí amarelo (arabic coffea) was less al3+ sensitive than the conilon (coffea canephora) clones and conilon mtl 25 clone was less al3+ sensitive than mtl 27. a higher al3+ activity resulted in a reduction of the p and ca content in the coffee leaves and roots, especially in the clones mtl 25 and mtl 27. al accumulation in the root system and the restriction of the transport to the aerial part are important factors in al3+ tolerance of coffee plants.
Características fisiológicas e crescimento de clones de eucalipto em resposta ao boro
Mattiello, Edson Marcio;Ruiz, Hugo Alberto;Silva, Ivo Ribeiro da;Guerra, Patrícia de Carvalho;Andrade, Vinícius Molica de;
Revista árvore , 2009, DOI: 10.1590/S0100-67622009000500005
Abstract: boron (b) requirement for plant growth varies both within and among plant species. in order to evaluate the response of clones of eucalyptus to b in nutrient solution, an experiment was carried out under glasshouse conditions, with eight clones. plants were grown in nutrient solutions at b concentrations of 0, 10, 20, 50 and 100 μmol/l for 70 days, after which, physiological variables, dry matter production and boron content were determined. there was a differential response of the eucalyptus clones to the concentration of boron in nutrient solution with maximum dry matter production occurring between 28 and 68 μmol/l of b in nutrient solution. at low concentrations of b, visual symptoms of deficiency were observed. at high b concentrations, toxicity symptoms were not observed; however, there was a reduction in dry matter production. the response to b depends on the clone. the clones 129 and 68 showed the highest rates of photosynthesis. the clone 3487 was the most responsive to b. the clones 3487, 3336 and 68 were more sensitive to b deficiency whereas clones 3281 and 1270 exhibited greater tolerance to b deficiency. clone 2486 was the most sensitive to b toxicity and the clone 3281 showed the highest tolerance to b. clones 3487, 2486 and 129 were more efficient in the use of boron.
Transporte de boro no solo e sua absor??o por eucalipto
Mattiello, Edson Marcio;Ruiz, Hugo Alberto;Silva, Ivo Ribeiro da;Barros, Nairam Félix de;Neves, Julio César Lima;Behling, Maurel;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000500021
Abstract: the mechanism and magnitude of b transport to plant roots depend on both water and b soil contents. the contribution of mass flow and diffusion to the b transport in soil to eucalypt roots was evaluated in response to the water potential and b rates. two water potentials (-10 and -40 kpa) and six b levels (0; 0.5; 1; 2; 3 and 5 mg dm-3 of b) were evaluated. the plants were grown in 2.5 dm3 plastic pots with soil, in a greenhouse. the water potential was controlled by a tensiometer in each pot and soil moisture adjusted with distilled water. the maximum root dry weight was produced at rates of 0.98 and 2.38 mg dm-3 of b, at potentials of -10 and -40 kpa, respectively, and the maximum shoot dry weight at rates of 0.96 and 1.82 mg dm-3 of b, at potentials of -10 and -40 kpa, respectively. positive and highly significant relationships were observed between b rates, soil extractable b, b in soil solution and b plant content at both water potentials. mass flow was the predominant mechanism for b transport in soil, supplying 100 % of the plant demand in the soils treated with the highest b rates. diffusion was a complementary mechanism, but its relative increased substantially under conditions of low soil b and greater water deficit.
Phloem mobility of Boron in two eucalypt clones
Mattiello, Edson Marcio;Ruiz, Hugo Alberto;Silva, Ivo Ribeiro da;Sarkis, Jorge Eduardo Souza;Neves, Júlio César Lima;Pucci, Murilo Marques;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000600018
Abstract: boron deficiency causes large productivity losses in eucalypt stands in extensive areas of the brazilian cerrado region, thus understanding b mobility is a key step in selecting genetic materials that will better withstand b limitation. thus, in this study b mobility was evaluated in two eucalypt clones (68 and 129), under b sufficiency or b deficiency, after foliar application of the 10b isotope tracer to a single mature leaf. samples of young tissue, mature leaves and roots were collected 0, 1, 5, 12 and 17 days after 10b application. the 10b:11b isotope ratio was determined by hr-icp-ms. samples of leaves and xylem sap were collected for the determination of soluble sugars and polyalcohols by ion chromatography. boron was translocated within eucalypt. translocation of foliar-applied 10b to the young tissues, mature leaves and roots was higher in clone 129 than in 68. seventeen days after 10b application to a single mature leaf, between 14 and 18 % of b in the young tissue was originated from foliar b application. in plants with adequate b supply the element was not translocated out of the labeled leaf.
Welfare issues of modern deer farming
Silvana Mattiello
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2009.s1.205
Abstract: This paper will start with briefly outlining the recent domestication history of red deer (Cervus elaphus) and fallow deer (Dama dama), followed by a description of the present status of modern deer farming. It will then review the main welfare issues of deer farming. The following aspects will be considered: accommodation and housing, management and handling, nutrition (feed and water provision), transport and slaughter, plus a short mention of velvet harvest. As a summary, the following practices can be recommended to ensure animal welfare in modern deer farming: the adoption of suitable housing systems and of adequate management techniques (e.g. specific handling pens and drop-floor cradles or crushes) and the respect of specific needs (e.g. provision of protection and shelter from predators as well as from climatic extremes, such as cold winds or direct solar radiation). Handling and yarding operations will be easier when they occur in dim light. Special attention must be paid to the manipulation of the newborns. At the slaughterhouse, facilities must be designed specifically for deer. The presence of well trained stockpersons, with a sound knowledge of deer physiology and behaviour, is also a key-factor for improving welfare levels in deer farms. To achieve these aims, training of the managers and stockpersons and the adoption of specific codes of conducts are highly recommendable.
The stability of the relativistic three-body system and in-medium equations
Stefano Mattiello
Physics , 2004, DOI: 10.1007/s00601-004-0032-8
Abstract: We present a relativistic three-body equation to study the stability of the isolated three-body system and the correlations in a medium of finite temperatures and densities. Relativity is implemented utilizing the light front form. Using a zero-range force we find the relativistic analog of the Thomas collapse and investigate the possibility that the nucleon exists as a Borromean system. Within a systematic Dyson equation approach we calculate the three-body Mott transition and the critical temperature of the color-superconducting phase.
Transport coefficients of the quark-gluon plasma in ultrarelativistic limit
Stefano Mattiello
Physics , 2012,
Abstract: The calculation of the transport coefficients of the strong quark-gluon plasma (sQGP), i.e. sheer viscosity $\eta$, heat conductivity $\gk$ and bulk viscosity $\zeta$, in the first Chapman-Enskog approximation is presented. Their formulation in terms of two-fold integrals depending on the particle interaction, known as relativistic omega integrals, is derived and their evaluation in the ultrarelativistic limit is worked out assuming a cross section independent of the relative and total momentum of two colliding particles. We find a suppression of the bulk viscosity and a pronounced temperature dependence for the sheer viscosity and heat conductivity. However, at high temperatures, they scale with the third and second power of the temperature respectively as expected. Furthermore, we find that all results in this ultrarelativistic expansion are dominated by the leading order contribution.
Page 1 /4412
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.