oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 56 )

2018 ( 91 )

2017 ( 96 )

2016 ( 87 )

Custom range...

Search Results: 1 - 10 of 41763 matches for " Ronaldo Santos do; "
All listed articles are free for downloading (OA Articles)
Page 1 /41763
Display every page Item
Initial Growth and Gas Exchanges of Plants of Colored Cotton Submitted to Saline Stress  [PDF]
Hallyson Oliveira, Ronaldo do Nascimento, Samuel Silva, José Alberto Ferreira Cardoso, Rafaela Felix Basílio Guimar?es, Elka Costa Santos Nascimento
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.912115
Abstract: The objective of the research was to evaluate the effects of saline stress on the initial growth and physiological parameters of three varieties of cotton plants, being two cultivars of colored fiber (BRS Topázio and BRS Verde) and one of white fiber (BRS 286). The experiment was conducted under greenhouse conditions. After chemical depletion with sulfuric acid, five seeds were seeded in polyethylene pots of 20 kg, leaving only one plant per pot after thinning. The experimental design was completely randomized, with a factorial scheme of 3 × 5, with five replications, totaling 75 plots, being three cotton varieties and five saline stress treatments—1.1; 3.1; 5.1; 7.1; 9.1 dS m1. The evaluations occurred at 15 and 30 days after the beginning of the treatments (DAT) for growth variables (plant height, stem diameter, number of leaves and leaf area) and gas exchange (stomatal conductance, net photosynthesis rate and transpiration. The variety that was most resistant to the salt stress levels studied was BRS 286, followed by BRS Topazio and BRS Verde.
Guidelines for the diagnosis and treatment of schistosomal myeloradiculopathy
Lambertucci, José Roberto;Silva, Luciana Cristina dos Santos;Amaral, Ronaldo Santos do;
Revista da Sociedade Brasileira de Medicina Tropical , 2007, DOI: 10.1590/S0037-86822007000500016
Abstract: schistosomal myeloradiculopathy is the most severe and disabling ectopic form of schistosoma mansoni infection. the prevalence of smr in centres in brazil and africa that specialise in attending patients with non traumatic myelopathy is around 5%. the initial signs and symptoms of the disease include lumbar and/or lower limb pain, paraparesis, urinary and intestinal dysfunctions, and impotence in men. the cerebrospinal fluid of smr patients shows an increase in protein concentration and in the number of mononuclear cells in 90% of cases; eosinophils have been reported in 40%. the use of magnetic resonance imaging is particularly valuable in the diagnosis of schistosomal myeloradiculopathy. the exclusion of other myelopathies and systemic diseases remains mandatory. early diagnosis and treatment with steroids and schistosomicides provide a cure for most patients, whilst delayed treatment can result in irreversible physical disabilities or death. to improve awareness concerning schistosomal myeloradiculopathy amongst public health professionals, and to facilitate the control of the disease, the brazilian ministry of health has launched a program of education and control of this ectopic form of schistosomiasis. the present paper reviews current methods for the diagnosis of smr and outlines protocols for treatment of the disease.
An analysis of the impact of the Schistosomiasis Control Programme in Brazil
Amaral, Ronaldo Santos do;Tauil, Pedro Luiz;Lima, David Duart;Engels, Dirk;
Memórias do Instituto Oswaldo Cruz , 2006, DOI: 10.1590/S0074-02762006000900012
Abstract: the impact of the schistosomiasis control programme (pce) in brazil was analyzed, covering the period 1976 to 2003, using the following indicators: percentage of schistosoma mansoni carriers detected among the population examined in the coproscopic surveys (pps): mortality rate for schistosomiasis, per 100,000 inhabitants (tme): hospitalization rate for schistosomiasis, per 100,000 inhabitants (tie): average age of deaths caused by schistosomiasis (imoe). there was a 38.5% reduction in the pps after the introduction of the pce, attributed to the treatment of carriers. even in hyper-endemic municipalities, such as conde and cuitegí, in the state of paraíba, the pps fell more than 50% after the first year of treatment. the parasitic burden of the carriers also decreased in the two municipalities. the tme was reduced by 63.4% and the tie by 77.3%. the mortality rate was highest among the 50-and-above age group. the country′s imoe rose 32.3%. the imoe was seen to be much lower in the state of minas gerais, where the pce was only initiated in 1983, with very limited coverage.
Aplica??o especial de inseticidas em saúde pública
Arag?o, Mario B.;Amaral, Ronaldo Santos do;Lima, Milton Moura;
Cadernos de Saúde Pública , 1988, DOI: 10.1590/S0102-311X1988000200002
Abstract: the fumigation of insecticides initiated by gorgas and oswaldo cruz had its importance reduced after the introduction of ddt but is use is being resumed with the development of low toxity organophosphate insecticides. at this time, however, the technological development is different. the airplane and the helicopter allowed the spraying of insecticides under the technical grade form and, after that, machines that could be transported in vehicles to perform this task were developed. soon after, the problem of the size of the droplets was resolved and these must be smaller than 20μ for mosquitoes. these applications at ultra low volume were initially used in brazil against culex quinquefasciatus and its use increased after the reintroduction of aedes aegypti. a series of experimental trials with the aim to produce a rapid decrease in the density of this insect was initiated in 1984 by sucam using technical grade sumithion (fenitrothion). subsequently it was tried the concentration of 60% in soybean oil and then sumithion and malathion at 40% with good results. with the machine transported in vehicle (leco) the flow rate was 126 ml/min with the vehicle at a speed of 10 km/hour which, in theory, corresponds to a dose of 300 ml/ha. at the slums of the city of rio de janeiro these, concentrations yielded very good results when applied with the aid of portable machines (microgen and hatsuta) using doses of 12-20 ml/house in steep areas and 4,5 ml/housein plane areas. with these machines the application of these insecticides in concentration of 25%, also in slums, yelded good results. with the portable machines it is necessary to make modifications to decrease the flow rate of the insecticide to improve the spectrum of sizes of the droplets. based in the available literature new experiments with lower concentration are suggested.
Estudo comparativo da eficácia de armadilhas para Aedes aegypti
Lima, Milton Moura;Amaral, Ronaldo Santos do;Arag?o, Mario B.;
Cadernos de Saúde Pública , 1989, DOI: 10.1590/S0102-311X1989000200002
Abstract: in the summer of 1984 and 1985 comparative trials for the surveillance of aedes aegypti were performed. in both occasions the most effective trap was one made by cutting an automobile tire in three parts. the chan′s autocide trap, modified by cheng et al. (1982) was less effective than the tires as well as the baked clay containers routinely used by the "superintendência de campanhas de saúde pública (sucam)." it was found also that plants on the traps increase to a great extent its attractiveness. this procedure however, is not functional for its routine use. the tires must always be taken to the laboratory and filled with water for the hatching of eggs. this practice has duplicated the positivity of the ovitrap. in view of the persistence of non hatched eggs the flaming of the traps must always be done before exposition. the finding of pupae 7 days after exposition shows that this period can not be exceded. tires are more effective traps and have also the advantages of being costless and non breakable.
Estudo das varia??es anat?micas do meato médio de doentes com queixas nasais através da nasofibroscopia flexível
Santos Junior, Ronaldo C.;Santos, Arlete C. G.;Jesus, Eduardo P. F. de;Abud, Lauro do N.;
Revista Brasileira de Otorrinolaringologia , 2003, DOI: 10.1590/S0034-72992003000200009
Abstract: the anatomical variations of the structure of the ostiomeatal complex as the agger nasi, the uncinate process, ethmoidal bulla and the middle turbinate can be properly evaluated by the standardization of the detailed endonasal flexible fiberoptic endoscopy. aim: the anatomical variations concerning sex, different groups of age, and the nasal cavity with variations were evaluated according to the development and pneumatization of the ethmoid bone. study design: clinical prospective. material and method: at the current thesis, 500 patients were studied with nasal complaints (1000 middle meatus). results and conclusions: extensive and bulbous-types conchas bullosas were the most frequent anatomical variation, followed by the overpneumatised agger nasi, paradoxical middle turbinate and medial angulation or medial prominence of the uncinate process. the agger nasi, extensive-type concha bullosa, paradoxical middle turbinate, medial angulation or medial prominence of the uncinate process and the overpneumatised ethmoid bulla tend to be bilateral, while the bulbous-type concha bullosa tend to be unilateral. a significant correlation between the prevalence of the overpneumatised agger nasi and the extensive and bulbous-types conchas bullosas in the same side, was observed. a significant correlation between the prevalence of extensive-type concha bullosa and bulbous-type concha bullosa in the contrary side, was observed. no significant correlation among the prevalence of the anatomical variations of the agger nasi, uncinate process, ethmoid bulla and middle turbinate was observed neither isolatedly nor associated, related to sex.
Estudo das varia es anat micas do meato médio de doentes com queixas nasais através da nasofibroscopia flexível
Santos Junior Ronaldo C.,Santos Arlete C. G.,Jesus Eduardo P. F. de,Abud Lauro do N.
Revista Brasileira de Otorrinolaringologia , 2003,
Abstract: Padronizando a nasofibroscopia flexível detalhada, podemos avaliar as varia es anat micas de estruturas do complexo ostiomeatal, tais como, agger nasi, processo uncinado, bula etmoidal e concha nasal média. OBJETIVO: Avaliar as varia es anat micas em rela o ao sexo, lado acometido e entre diferentes faixas etárias de acordo com o desenvolvimento e pneumatiza o do etmóide. FORMA DE ESTUDO: Clínico prospectivo. MATERIAL E MéTODO: No presente trabalho, foram estudados 500 doentes com queixas nasais (1000 meatos médios). RESULTADOS E CONCLUS ES: As conchas nasais médias globosas, extensiva e bulbosa, foram as varia es anat micas mais freqüentes, seguidas pelo agger nasi hipertrofiado, concha nasal média paradoxal e processo uncinado angulado ou projetado medialmente. O agger nasi, a concha média globosa extensiva, concha nasal média paradoxal, o processo uncinado angulado ou projetado medialmente e a bula etmoidal hipertrofiada tendem a ser bilaterais, enquanto a concha média globosa bulbosa tende a ser unilateral. Houve correla o significante entre a prevalência do agger nasi hipertrofiado e das conchas nasais médias globosas tipo extensiva e bulbosa ipsilateralmente. Houve correla o significante entre a prevalência da concha nasal média globosa tipo extensiva e da concha nasal média globosa tipo bulbosa contralateralmente. N o houve correla o significativa entre a prevalência das varia es anat micas do agger nasi, processo uncinado, bula etmoidal e concha nasal média isoladamente ou associadas, em rela o ao sexo.
Growth and Photosynthetic Pigments of Cotton Cultivars Irrigated with Saline Water  [PDF]
Elka Costa Santos Nascimento, Ronaldo do Nascimento, André Alisson Rodrigues da Silva, Carlos Vailan de Castro Bezerra, Mateus Costa Batista, Luana Lucas de Sá Almeida Veloso, Márcia Cristina de Araújo Pereira, Hallyson Oliveira
Agricultural Sciences (AS) , 2019, DOI: 10.4236/as.2019.101007
Abstract: The cultivation of cotton is a relevant socioeconomic activity in the Brazilian agricultural scenario. In the Brazilian Northeast, however, production is limited by low rainfall, requiring water supplementation, a problem for the cotton cultivation practiced in the semi-arid region, due to the presence of saline ions in several water sources, from where the water is used for irrigation. It is necessary to identify cultivars that better tolerate saline stress in order to provide subsidies for their cultivation under such conditions. In this sense, the objective was to evaluate the tolerance of cotton cultivars to salinity. The experiment was conducted in a greenhouse, belonging to the Natural Resource Technology Center of the Federal University of Campina Grande, Campus I, Campina Grande, Brazil, in a completely randomized design in a 2 × 5 factorial scheme, with four replications, totaling 40 experimental units (BRS 368 RF and BRS SAFIRA) submitted to five saline levels (1.5, 3.0, 4.5, 6.0 and 7.5 dS·mˉ1). Irrigation with water saline of EC from 1.5 dS·mˉ1 affects adversely the growth of cotton cultivars, causing reductions in plant height, stem diameter, leaf area and number of leaves. Saline stress reduced the levels of the photosynthetic pigments of the cotton plants studied.
Neutral Sterols of Cephalic Glands of Stingless Bees and Their Correlation with Sterols from Pollen
Maria Juliana Ferreira-Caliman,Cláudia Inês da Silva,Sidnei Mateus,Ronaldo Zucchi,Fabio Santos do Nascimento
Psyche , 2012, DOI: 10.1155/2012/982802
Abstract: Sterols are essential molecules in the membrane lipid composition and precursors of important sterol hormones that regulate many developmental processes. Insects are unable to synthesize sterols de novo and, thus, all phytophagous insects depend on an exogenous source of sterols for growth, development, and reproduction. The sterol requirements of social bees are not fully known due to the fact that there is no well-defined diet available throughout the year with regard to floral resources. Our study aimed to characterize the sterols present in pollen stored in Melipona marginata and Melipona scutellaris colonies, as well as evaluating their presence in the mandibular, hypopharyngeal, and cephalic salivary gland secretions. We analyzed the chemical composition of pollen stored in the colonies and the composition of the cephalic glands of workers in three adult functional phases (newly emerged, nurses, and foragers) by gas chromatography and mass spectrometry. The results showed that the pollen analyzed contained campesterol, stigmasterol, sitosterol, isofucosterol, lanosterol, and small amounts of cholesterol. The glands showed the same compounds found in the pollen analyzed, except lanosterol that was not found in M. scutellaris glands. Surprisingly, cholesterol was found in some glands with relative ratios greater than those found in pollen. 1. Introduction Sterols are essential molecules in cell membrane, they are precursors of sterol hormones and other important regulators of developmental processes. However, insects are unable to synthesize them and have to purchase sterols from their diet [1]. The dietary needs for sterols in insects were firstly reported by Hobson [2] in the blowfly Lucilia sericata. Moreover, in 1959, Clark and Bloch [3] showed the inability of insects to synthesize sterols de novo, so that they need to purchase these compounds for auxotrophy (from the Greek “to increase” and “nutrition”). Auxotrophic individuals are unable to synthesize organic compounds necessary for its growth. These authors showed the importance of sterols as structural (cholestanol) and metabolic (cholesterol) components in insects. Further studies showed that ecdysteroids derivatives from cholesterol participate in the control of insect growth and maturation [4]. Furthermore, the necessity of sterol ingestion by insects has been demonstrated in different orders including Orthoptera, Hemiptera, Diptera, Lepidoptera, and Hymenoptera [5]. Indeed, all phytophagous insects studied to date rely on exogenous sterol for growth, reproduction and development [6, 7].
Avalia??o de cultivares de mandioca, para consumo in natura, quanto à resistência à mancha parda da folha
Santos, Ronaldo P.;Carmo, Margarida Goréte F. do;Parraga, Mário S.;Macagnan, Dirceu;Lopes, Clarindo Aldo;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000200014
Abstract: two field experiments were conducted to confirm the etiological agent of the cassava 'brown leaf spot', to study the progress of the disease and to evaluate resistance, agronomic and nutritional traits of different cassava cultivars. the experiments were performed in rio de janeiro state, brazil. in the first experiment, six cassava cultivars (amarelinha, marcos op, iac-264, baiana, mantiqueira and sonora), were evaluated from february/1997 to june/1998. in the second experiment, performed from january to august/1999, the same cultivars, plus 'saracura', and 'rosada de sc' were evaluated, in a randomized complete block design, with three replicates. the intensity of the disease, initiated from natural infection, was quantified at seven and 15 days, when the severity and the incidence of injured leaves were considered. at harvest, the severity and incidence of injured leaves, defoliation rates and number of injured leaves were estimated. disease progress curves were built for the incidence and for severity data; the area under the curves was used to calculate the disease severity and infected leaf severity. there were differences among the cultivars in relation to brown leaf spot resistance, caused by cercosporidium henningsii. cultivar 'amarelinha' was the most susceptible, and 'baiana' and 'sonora' the most resistant. there were no differences between the cultivars in yield and root characteristics, except 'amarelinha' with higher root weight. there was a negative and significant correlation between the severity of the disease (expressed by the values of the area under the disease progress curve) and the number and weight of roots.
Page 1 /41763
Display every page Item


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