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Nitrogen and potassium supply and the morphogenic and productive characteristics of marandu palisadegrass
Megda, Marcio Mahmoud;Monteiro, Francisco Antonio;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800007
Abstract: the objective of this work was to study morphogenic characteristics, and dry matter production of roots and shoots of marandu palisadegrass (brachiaria brizantha cv. marandu) submitted to combinations of nitrogen and potassium, in a nutritive solution, employing silica as substrate. the experiment was carried out in a greenhouse during the summer. it was used a 52 fractionated factorial scheme with 13 combinations of nitrogen and potassium, which were distributed in a randomized block design, with four replications. the nitrogen × potassium interaction was significant for the number of tillers and leaves, for leaf area, for shoots and root section dry mass, for total length and surface and specific length and surface in the roots. production of aerial part dry mass positively correlated with the number of tillers and leaves and grass leaf area. nitrogen rates modulated the root system development, and the root specific length and surface decreased when high rates of nitrogen and potassium were supllied. nitrogen and potassium influence marandu palisadegrass morphogenic characteristics, which are determinant for grass dry matter production.
Correla??o linear e espsacial entre a produtividade de feij?o e a porosidade de um Latossolo Vermelho de Selvíria (MS)
Megda, Marcio Mahmoud;Carvalho, Morel de Passos e;Vieira, Michele Xavier;Andreotti, Marcelo;Pereira, Elaine Cristina;
Revista Brasileira de Ciência do Solo , 2008, DOI: 10.1590/S0100-06832008000200032
Abstract: soil porosity influences plant development since root growth and crop yield are determined by the root depth. the objective of this study was to investigate the linear and spatial variability and correlations between common bean yield and soil porosity. the bean grain yield of the irrigated cultivar carioca iac was analyzed in the growing season 2004/2005, in selviria-ms, as well as macroporosity (ma), microporosity (mi) and total porosity (tp), in a dystroferric red latosol, at four depths: 1 (0.0-0.10 m), 2 (0.10-0.20 m), 3 (0.20-0.30 m) and 4 (0.30-0.40 m). soil and plant data were collected in a geostatistical grid with 135 points spaced 10 m apart, covering an area of 50 x 150 m. the data of the studied attributes did not vary randomly and the values were intermediate to low. they followed well-defined spatial standards, reaching between 11.70-104.40 m. on the other hand, the linear correlation between the plant and soil attributes was low, due to the high number of observations. grain yield had the best linear correlations with ma1b, mi1 and tp3. from the spatial point of view, the inverse correlation between pg and #tp2 was outstanding. at the sites where #tp2 diminished (0.030-0.045 m3 m-3 ) the yield varied from 2,173 to 3,529 kg ha-1 and where it increased (0.045-0.076 m3 m-3 ), the yield was between 1,630 and 2,173 kg ha-1. therefore, the total soil porosity, evaluated in the 0.10-0.20 m layer (#tp2), indicated the importance of the contact root/soil and was in turn a satisfactory indicator of soil physical quality, with a view to the grain yield of irrigated common bean.
Root system characteristics of Marandu palisadegrass supplied with nitrogen and magnesium rates
Garcez, Tiago Barreto;Megda, Marcio Mahmoud;Artur, Adriana Guirado;Monteiro, Francisco Antonio;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000700005
Abstract: the development of root system of forage grasses is influenced by the supply of mineral nutrients. the experiment was carried out in a greenhouse in piracicaba, s?o paulo state, with the objective of evaluating the effect of nitrogen and magnesium rates on dry mass yield, total length and surface, specific length and surface, and concentrations of nitrogen, magnesium, calcium and potassium in the root system of brachiaria brizantha stapf. cv. marandu. it was studied five rates of nitrogen (2, 9, 16, 23 and 30 mmol l-1) and five rates of magnesium (0.05, 0.70, 1.35, 2.00 and 2.65 mmol l-1) in nutrient solutions in an incomplete 52 factorial arrangement, which resulted in the following combinations: 2/0.05; 2/1.35; 2/2.65; 9/0.70; 9/2.00; 16/0.05; 16/1.35; 16/2.65; 23/0.70; 23/2.00; 30/0.05; 30/1.35 and 30/2.65. the experimental design was a randomized block with four replications. plants had two growth periods, and after the second harvest the roots were separated from the plant tops. combination of the high rates of nitrogen and magnesium resulted in expressive increases in rooty dry matter yield, in the length and in the root surface of marandu palisadegrass. high rates of nitrogen and magnesium resulted in short root specific length and surface. combinations of high rates of nitrogen and magnesium increased nitrogen concentration or decreased potassium concentration in the roots. calcium concentration in the roots was increased by nitrogen rates and decreased by magnesium rates. magnesium rates resulted in increase in magnesium concentration in the roots of marandu palisadegrass.
Resposta de cultivares de trigo ao nitrogênio em rela??o às fontes e épocas de aplica??o sob plantio direto e irriga??o por aspers?o
Megda, Márcio Mahmoud;Buzetti, Salatiér;Andreotti, Marcelo;Teixeira Filho, Marcelo Minhoto Carvalho;Vieira, Michele Xavier;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000400016
Abstract: nitrogen fertilization is very important to wheat crop, since nitrogen constitutes one of the most demanded nutrients by this crop, which yield is directly related to the amount of nutrients accumulated in the plant. three nitrogen sources were tested at 70 kg n ha-1: ammonium sulfonitrate with nitrification inhibitor, ammonium sulfate, and urea in two applications (at sowing or at side dressing), besides a control that did not receive nitrogen as treatment. four wheat cultivars were tested: embrapa 21, embrapa 22, embrapa 42, and iac 370. the experiment was carried out under irrigation in two years (2005 and 2006) at experimental station of unesp/s?o paulo - brazil. the n sources ammonium sulfonitrate, ammonium sulfate, and urea did not differ among them; however, they were higher than the control regarding the grain yield. n applied at side dressing provided an increase in grain yield. the cultivar performance concerning the production and grain yield depended on the environmental condition of the year.
Degranula??o de neutrófilos ex-vivo por a??o do polímero de amido de mandioca
Cristovam, Marcos Antonio da Silva;Gon?alves, Gentil Ferreira;Takemura, Orlando Seiko;Tomasini, Ana Paula Inoe;Dragunski, Douglas;Reolon, Joice;Gomes, Juliana Oliveira;Megda, William;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782010005000075
Abstract: the neutrophils play an essential role in host defenses against infection. when stimulated it responds with an increase of consumption of oxygen known as 'respiratory burst', so generating a great quantity of superoxide anion and hydrogen peroxide, which play an important function antimicrobial, and subsequent degranulation of neutrophils. polymers are materials largely used in veterinary medicine. several studies have been carried out to find new polymers and their biocompatibility to medical use. one polymer of cassava's starch (manihot esculenta crantz) was developed at the paranaense university's laboratory of chemistry - campus umuarama city, aiming to analyze the neutrophils degranulation after exposition to this starch. the early results showed a bioinert action of the polymer of cassava's starch on different concentrations when it was in contact with neutrophils. thus, this material is potentially indicated as biomaterial.
Response of irrigated wheat cultivars to different nitrogen rates and sources
Teixeira Filho, Marcelo Carvalho Minhoto;Buzetti, Salatiér;Andreotti, Marcelo;Sá, Marco Eustáquio de;Arf, Orivaldo;Megda, Márcio Mohamed;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000500023
Abstract: high wheat yields require good n fertilization management. the objective of this study was to evaluate the effects of different n applications at sowing using entec (n source with nitrification inhibitor) and urea (traditional n source) at covering, on four wheat cultivars. the experiment was conducted in a randomized block design in a factorial scheme, with four replications, at the experimental station of the faculdade de engenharia de ilha solteira - unesp, on a dystrophic, epi-eutrophic alic red latosol with loamy texture, formerly under savannah vegetation. four n rates (0, 60, 120, and 180 kg ha-1) were tested, applied at sowing in the case of entec and top-dressed 40 days after plant emergence in the case of urea, and the four wheat cultivars e 21, e 22, e 42, and iac 370. the yield of the wheat cultivars e 21 and e 42 was highest. plant height and lodging index of cultivar e 22 were greatest, with consequently lowest grain yield. there was no significant difference between entec (applied at sowing) and urea (top-dressed) in terms of grain yield and yield components. nevertheless, urea resulted in a higher n leaf content, and entec in a larger number of undeveloped spikelets. high nitrogen rates influenced the hectoliter mass negatively, affecting wheat grain quality. grain yield increased under n rates of up to 82 kg ha-1 n, through entec applied at sowing or top-dressed urea.
First report of coenurosis in sheep in the State of Mato Grosso do Sul, Brazil
Batista, Fernando Arévalo;Pizzigatti, Dietrich;Martins, Charles Ferreira;Nunes, Marcelo Monteiro;Megda, Tábata Torres;Ribeiro, Olímpio Crisóstomo;Paiva, Fernando;
Revista Brasileira de Parasitologia Veterinária , 2010, DOI: 10.1590/S1984-29612010000400016
Abstract: this paper reports the first case of coenurosis in the state of mato grosso do sul, brazil. this disease is caused by the larval stage of the tapeworm taenia multiceps (leske, 1780). the animal in which the disease was diagnosed was an 18-month-old ewe from an endemic area of southern brazil as an imported animal among a group of 30 sheep. the clinic-pathological condition was that commonly found in herbivores affected by the disease, especially sheep. apathy, nystagmus, intermittent blindness, circling and pressing head against obstacles were the neurological signs reported. the necropsy showed that a brain lesion in the subcortex of the right hemisphere was a bladder-like cyst measuring 4 cm in diameter filled with a translucent fluid with a large number of white spherules (protoscolices) floating. in addition to the identification of the coenurus cerebralis protoscolices, the brain tissue lesion was histopathologically described.
Perfil biopsicossocial de portadores de anoftalmia no sul de Minas Gerais - Brasil
Cabral, Luiz Gustavo Megda;Martelli Júnior, Hercílio;Leite, Denise Moura;Sabatini Júnior, David;Freitas, Amanda Beatriz Dahdah Aniceto de;Miranda, Roseli Teixeira;Swerts, Mário Sérgio Oliveira;Barros, Letízia Monteiro de;
Arquivos Brasileiros de Oftalmologia , 2008, DOI: 10.1590/S0004-27492008000600017
Abstract: purpose: to evaluate the biopsychosocial profile of patients with anophthalmia, with emphasis on the psychological and functional impact of eye loss and the social reintegration of this population. methods: prospective analyses of 84 patients (50 males and 34 females), rehabilitated or in the rehabilitation process with ocular prostheses were interviewed by means of a questionnaire with dimensions involving the etiology of the ocular defect, degree of adaptation to the ocular prosthesis, and impact on professional, family and social activities. result: the right eye was affected in 45.2% of the patients, the left eye in 51.2%, and the rest of the patients had bilateral anophthalmia. difficulty in adapting to monocular vision was reported by 47.6% of the patients. the main causes of anophthalmia in males were eye injuries due to accidents (54%), and, in females, acquired diseases (38.2%). for the total studied population, the eye loss occurred at a mean of 20.5 ± 18.41 years, and the elapsed time until the first rehabilitation with ocular prosthesis was of 8.6 ± 13.10 years. most patients (66.1%) reported satisfaction and good adaptation to the prosthesis. feelings of sadness, shame and shyness were frequently reported. conclusion: anophtalmic patients often exhibit psychic and/or functional disorders which hinder their social, professional and family readaptation, and this is aggravated by both economic factors and lack of public services that provide rehabilitative treatment. public information campaigns could also be useful to prevent causes that lead to ocular loss.
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