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Search Results: 1 - 10 of 22375 matches for " Norberto Mario;Lopes "
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Predi??o do consumo de pasto de capim-elefante (Pennisetum purpureum, Schumack) por vacas mesti?as Holandês x Zebu em lacta??o
Lopes, Fernando César Ferraz;Aroeira, Luiz Januário Magalh?es;Rodriguez, Norberto Mario;Sampaio, Ivan Barbosa Machado;Deresz, Fermino;Borges, Iran;Berchielli, Telma Teresinha;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000300035
Abstract: equations for predicting elephantgrass (pennisetum purpureum, schumack) dry matter intake (dmi) by holstein x zebu lactating dairy cows under grazing were developed by stepwise regression analysis. the dataset consisted of results of trials carried out at embrapa gado de leite (coronel pacheco, mg, brazil). the independent variables related to animal factors (days in milk; milk protein, fat and total solids contents and yields; live weight; live weight at calving; milk and fat-corrected milk yield; holstein x zebu gene fraction; order of parturition); management factors (occupation day of paddock; forage allowance and availability; resting periods); environmental factors (season of the year; rainfall) and feed factors (in vitro digestibility and parameters of chemical composition of elephantgrass herbage and sugarcane - saccharum officinarum (l.) plus 1% urea; supplement intake - concentrate and sugarcane plus urea; fecal crude protein, neutral and acid detergent fiber concentration). logarithmic and quadratic functions for some variables were also considered. the main independent variables selected at the best-fit regressions models (r2 = 65.2-67.0%) for elephantgrass herbage dmi were roughage supplement (sugarcane plus urea) dmi; elephantgrass in vitro digestibility; rainfall; fat-corrected milk yield; live weight (or alternatively live weight at calving) and concentrate intake that showed substitution effect to intake of elephantgrass in supplementing grazing cows.
Consumo e digestibilidade de silagens de capim-elefante com diferentes níveis de subproduto da agroindústria da acerola
Ferreira, Ana Cristina Holanda;Neiva, José Neuman Miranda;Rodriguez, Norberto Mario;Lopes, Fernando César Ferraz;L?bo, Raimundo Nonato Braga;
Revista Ciência Agron?mica , 2010, DOI: 10.1590/S1806-66902010000400025
Abstract: the present study aimed to determine de nutritional value of mixed elephant grass silages and increasing levels of dehydrated acerola industry by-product (pac). five pac levels (0; 3.5; 7.0; 10.5 and 14%) were evaluated in a digestibility trial with 20 male non-castrated sheep in a randomized experimental design of five treatments (pac levels) and four replications per treatment (sheep). intake and digestibility of dry matter (dm), crude protein (cp), neutral detergent fiber (ndf), acid detergent fiber (adf), cellulose (cel), hemicelulose (hcel) and energy digestible as well as nitrogen balance were determined. the addition of pac, didn't influence the consumption of dm, ndf, adf, ddm and dndf. however, the addition of 1% pac in the silage of elephant grass resulted in increase of 1.91 g and 0.04 g in the daily consumptions of cp and dcp, respectively. with the addition of pac, there were no alterations in the digestibility of dm (43%), cp (36.4%), ndf (44.8%) and in nitrogen balance (0.22 g) of the silages. however, nitrogen balance reached positive values when 10.5 and 14% of pac were added to the silage. the by-product of dehydrated acerola may be added in levels of up to 14% of the natural matter in the silage of elephant grass, because it doesn't affect the intake and digestibility of the nutrients by sheep.
Hot-pressing process modeling for medium density fiberboard (MDF)
Norberto Nigro,Mario Storti
International Journal of Mathematics and Mathematical Sciences , 2001, DOI: 10.1155/s0161171201020166
Abstract: We present a numerical solution for the mathematical modeling of the hot-pressing process applied to medium density fiberboard. The model is based on the work of Humphrey (1982), Humphrey and Bolton (1989), and Carvalho and Costa (1998) with some modifications and extensions in order to take into account mainly the convective effects on the phase change term and also a conservative numerical treatment of the resulting system of partial differential equations.
Características do pasto e desempenho de novilhas em sistema silvipastoril e pastagem de braquiária em monocultivo
Paciullo, Domingos Sávio Campos;Lopes, Fernando César Ferraz;Malaquias Junior, Jo?o Darós;Viana Filho, Ant?nio;Rodriguez, Norberto Mario;Morenz, Mirton José Frota;Aroeira, Luiz Januário Magalh?es;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009001100022
Abstract: the objective of this work was to evaluate the pasture characteristics and the performance of heifers from the holstein x zebu cross in a silvopastoral system (sps), and in a brachiaria (urochloa decumbens) pasture. the experiment was set up in a randomized block design with two treatments: an exclusive brachiaria pasture; and sps, which had mixed u. decumbens and stylosanthes guianensis strips alternating with strips with trees. paddocks were grazed in rotational stocking, with seven days of grazing and 35 and 49 days of rest in the rainy and dry seasons, respectively. pasture traits, dry matter intake and live weight gain did not vary with the systems. however, due to the reduction in the amount and nutritional value of the forage, these variables had higher values for the rainy season than the dry season, respectively: pre-grazing forage mass, 1,525 and 964 kg ha-1; crude protein, 9.3 and 8.2%; in vitro dry matter digestibility, 56.1 and 50.3%; dry matter intake, 2.3 and 1.6% of body weight; and live weight gain, 625 and 242 g per day per heifer. moderate shading in sps did not affect pasture traits, dry matter intake, or the performance of the heifers, in comparison to the values obtained for an exclusive brachiaria pasture.
Characterisation of Flavonoid Aglycones by Negative Ion Chip-Based Nanospray Tandem Mass Spectrometry
Paul J. Gates,Norberto P. Lopes
International Journal of Analytical Chemistry , 2012, DOI: 10.1155/2012/259217
Abstract: Flavonoids are one of the most important classes of natural products having a wide variety of biological activities. There is wide interest in a range of medical and dietary applications, and having a rapid, reliable method for structural elucidation is essential. In this study a range of flavonoid standards are investigated by chip-based negative ion nanospray mass spectrometry. It was found that the different classes of flavonoid studied have a combination of distinct neutral losses from the precursor ion [M-H]? along with characteristic low-mass ions. By looking only for this distinct pattern of product ions, it is possible to determine the class of flavonoid directly. This methodology is tested here by the analysis of a green tea extract, where the expected flavonoids were readily identified, along with quercetin, which is shown to be present at only about 2% of the most intense ion in the spectrum. 1. Introduction Flavonoids are an important class of dietary natural products with a range of biological activities, such as antioxidant, UV-protection, antiparasitic, anti-inflammatory, and antifungal [1–6]. The flavonoids are subcategorised into eight different classes with some of the compounds also exhibiting possible beneficial properties such as health-promoting and anticancer activities [7]. The common C6-C3-C6 structural core for all flavonoids arises from the shikimate (C6-C3) and acetate (C6) biosynthetic pathways. In their review, Williams and Grayer pointed out that the theoretical number of possible flavonoid structures (with hydroxyl, methoxyl, methyl, isoprenyl benzyl, and sugar substituents) is enormous, and many new natural flavonoids are still to be isolated [8]. Until now, more than 9000 different flavonoids have been isolated. The majority were isolated and identified employing classical phytochemical procedures, and there is no doubt that many more new flavonoids remain to be discovered [8]. Many analytical methodologies have been developed to detect and quantify flavonoids, mostly using high-performance liquid chromatography with UV-VIS spectral detection. However, identification of flavonoids, as well as other natural products, through hyphenated systems (LC-UV) is limited since a complete chromatographic resolution for all chromophores is required to be sure that the correct conclusion is reached [9, 10]. Mass spectrometry (MS) with electrospray ionisation (ESI) has emerged as a complementary method for high sensitivity, selectivity, and fast analysis of natural products [11], such as sesquiterpene lactones [12] and alkaloids
Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários
Gobbo-Neto, Leonardo;Lopes, Norberto P.;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000200026
Abstract: since secondary metabolites represent a chemical interface between plants and surrounding environment, their syntheses are frequently affected by environmental conditions. thus, variations in the total content and/or of the relative proportions of secondary metabolites in plants can take place. we review the main environmental factors that can streamline or alter the production or concentration of secondary metabolites in plants. how seasonality, circadian rhythm, developmental stage and age, temperature, water availability, uv radiation, soil nutrients, altitude, atmospheric composition and tissue damage influence secondary metabolism are discussed.
Zooplankton in the surrounding waters of the Juan Fernández Archipelago
Petrillo,Mario; Giallain,Marina; Della Croce,Norberto;
Revista de biología marina y oceanografía , 2005, DOI: 10.4067/S0718-19572005000100007
Abstract: un estudio para el conocimiento de los estadios larvales de jasus frontalis (milne-edwards, 1836) ha permitido estimar la composición cualitativa y la estructura cuantitativa del zooplancton en las aguas del archipiélago juan fernández
Historia y recepción del redescubrimiento (1985) de la proeza biomédica de Alberto Alberti (1883), luego Primario del Hospital Italiano de Buenos Aires.
Norberto César Contreras,Mario Crocco
Electroneurobiología , 2004,
Abstract: A memorative piece in Spanish, wherein the persons who brought to light (1985) Alberto Alberti's biomedical feat (1883) recount the rediscovery's history and reception. Alberti performed since September 15, 1883, the worldwide first, continuous electrostimulation of a living human brain, during eight months, aimed to map brain functions and thus make neurosurgery feasible. (Patients theretofore died by excess of trephinations, because most attempts to localize the central focus use to fail, by lack of such a map). CASTELLANO: La historia y recepción del redescubrimiento (1985) de la proeza biomédica de Alberto Alberti (1883) es relatada por sus autores en la presente rese a historiográfica. A menudo los pacientes – ni os y adultos – fallecían por exceso de trepanaciones realizadas por puntos equivocados: sin imágenes internas, sólo los síntomas sensorio-motrices podían brindar alguna pista. Pero no se conocían las localizaciones cerebrales de los focos que creaban esos síntomas: tras el óbito, sólo en una minoría de casos se hallaban localizaciones – falseadas no pocas veces por los vericuetos anatómicos del curso de las vías blancas. En concreto, el abordaje endocefálico era impracticable. El médico Alberto Alberti (1854-1913) atendía en San Nicolás a una paciente criolla afectada por una osteítis luética, que le venía desintegrando progresivamente la calota craneal. Alberti logró mantenerla viva y desde el 15 de septiembre de 1883 y hasta bien entrado 1884, tal vez hasta junio, arriesgando sanciones e incidentalmente hasta la pérdida de su compromiso matrimonial, construyó un mapa de numerosas localizaciones cerebrales de funciones motrices y sensitivas. (Article in Spanish)
HPLC-ESI-MS/MS analysis of oxidized di-caffeoylquinic acids generated by metalloporphyrin-catalyzed reactions
Santos, Michel D.;Lopes, Norberto P.;Iamamoto, Yassuko;
Química Nova , 2008, DOI: 10.1590/S0100-40422008000400011
Abstract: this paper reports an hplc-esi-ms/ms investigation on the oxidation of 3,5- and 4,5- dicaffeoylquinic acid using iron(iii) tetraphenylporphyrin chloride as catalyst. two major mono-oxidised products of the quinic acid moiety have been identified for both compounds. however, only the 4,5-derivative afforded two different tri-oxo products. thus, it seems that the oxidation pattern depends on the number and positions of the caffeic acid moieties present in caffeoylquinic acid molecules.
Biosynthesis of tetrahydrofuran lignans in Virola surinamensis
Lopes, Norberto Peporine;Yoshida, Massayoshi;Kato, Massuo Jorge;
Revista Brasileira de Ciências Farmacêuticas , 2004, DOI: 10.1590/S1516-93322004000100009
Abstract: the labelled substrates phenylalanine and phenylpropanoid e-isoeugenol were incorporated to 5-methoxy-4-o-methyl-e-isoeugenol (e-isoelemicin) and to the tetrahydrofuran lignan verrucosin in plantlets of virola surinamensis (myristicaceae).
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