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Search Results: 1 - 10 of 405155 matches for " Maria do Carmo F. R.;Dantas "
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Trypanocidal activity of isolated naphthoquinones from Tabebuia and some heterocyclic derivatives: a review from an interdisciplinary study
De Moura, Kelly C. G.;Emery, Flávio S.;Neves-Pinto, Cleverson;Pinto, Maria do Carmo F. R.;Dantas, Andrea P.;Salom?o, Kelly;Castro, Solange L. de;Pinto, Ant?nio V.;
Journal of the Brazilian Chemical Society , 2001, DOI: 10.1590/S0103-50532001000300003
Abstract: naphthoquinones isolated from the wood of trees of the families bignoniaceae and verbenaceae have been subjected to an interdisciplinary study since the seventies, when dr. benjamin gilbert, at the federal university of rio de janeiro, launched a program on the chemistry of natural products active against endemic diseases. in this paper we describe the synthesis of five naphthoimidazoles, derived from this program and their activity towards t. cruzi, the etiologic agent of chagas disease. we also review the influence of chemical structure on trypanocidal action of naphthoquinones and of derived heterocycles with imidazole, oxazole, phenoxazine, indole, dipyrane and cyclopentene rings. the overall analysis corroborates the tendency of trypanocidal activity in compounds with an imidazole or oxazole ring linked to a naphthopyrane structure. two naphthoimidazoles presented higher activities (14.5x and 34.8x) than the standard crystal violet. emphasis is given to the biodiversity of the brazilian flora as a starting point for the development of an autonomous and creative medicinal chemistry.
Relato de uma experiência: recupera o e cadastramento de resíduos dos laboratórios de gradua o do Instituto de Química da Universidade Federal do Rio Grande do Sul
Amaral Suzana T.,Machado Patrícia F. L.,Peralba Maria do Carmo R.,Camara Maria Regina
Química Nova , 2001,
Abstract: An experience aiming to promote a residue interchange and recovery between the teaching laboratories of the Chemistry Institute of this University is described. At the present, several residues interchange have already appeared as advantageous. To make the work easier, a software has been developed in order to keep a record of all the residues generated by the teaching laboratories. Standard labels have been developed for the residues in order to organize them. The software and the label design are described.
Prevalence of Frailty Syndrome in the Elderly and Associated Factors in Brazil  [PDF]
Anna Ferla Monteiro Silva Passos, Iris do Céu Clara Costa, Fábia Barbosa de Andrade, Maria do Carmo Eulálio, Anita Liberalesso Neri, R?mulo Lustosa Pimenteira de Melo, Adrianna Ribeiro Lacerda
Health (Health) , 2015, DOI: 10.4236/health.2015.711172
Abstract: This paper aims to identify the prevalence of frailty syndrome and its association with demographic, economic, health, psychological and functional variables in Brazilian population. The study was cross-sectional and composed of 385 elderly aged from 65 years, an average age of 73.92 years. A multivariate Poisson regression was used to check for conditions associated with frailty and to determine the prevalence (α = 0.05). The prevalence of frailty was 8.7% and pre-frailty of 50.4%. The frail and pre-frail older adults showed larger and increasing prevalence ratios for marital status, difficulty performing instrumental activities of daily living, old age, involuntary loss of feces, depression and negative affections. These results can guide the establishment of preventive measures and the development of intervention strategies aimed at minimizing the adverse effects of frailty in elderly people.
Spatial and temporal variation of the nutrients in the sediment and leaves of two Brazilian mangrove species and their role in the retention of environmental heavy metals
Bernini, Elaine;Silva, Maria A. B. da;Carmo, Tania M. S. do;Cuzzuol, Geraldo R. F.;
Brazilian Journal of Plant Physiology , 2010, DOI: 10.1590/S1677-04202010000300005
Abstract: spatial and temporal variation of the nutrient concentrations in leaves and sediment between the roots of laguncularia racemosa (l.) gaertn. f and rhizophora mangle l. was analyzed in the mangrove forest of the estuary of s?o mateus river, espírito santo, brazil. in leaves, the nutrients followed the sequence: n> ca> k> mg> s> p> fe> mn> zn> cu, and there were significant differences between species and sites studied. in general, the levels of k were higher in the dry season compared to the rainy season for both species analyzed while ca and cu showed higher concentrations in the rainy season for laguncularia racemosa. in the sediment, the nutrients followed the sequence: mg> ca> fe> k> mn> p> zn> cu, in general, with lower concentrations at the site where the sediment was sandier. we observed a significant variation of nutrient concentrations in the sediment between the periods analyzed, but the seasonal pattern was not clear for all nutrients. nutrient concentration profile found in leaves of both plant species was not correlated with concentrations found in the respective sediments. the concentration factor was less than 1.0 for fe and between 1.0 and 3.7 for mn, zn and cu. these results provide physiological evidences about the relevance of these tree species for the role of mangroves as biogeochemical barriers to the transit of heavy metals.
Increase in Straight and Coiled Cylindrospermopsis raciborskii (Cyanobacteria) Populations under Conditions of Thermal De-Stratification in a Shallow Tropical Reservoir  [PDF]
Maria do Carmo Bittencourt-Oliveira, Ariadne do Nascimento Moura, Talita Caroline Hereman, Enio Wocyli Dantas
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.34031
Abstract: In recent decades, there have been frequent occurrences of the cyanobacterium Cylindrospermopsis raciborskii in northeastern Brazil. Little is known regarding the response of straight and coiled morphotypes to environmental conditions such as light intensity and water temperature. Samples were collected at the Mundaú reservoir (PE, Brazil) at six sampling depths in the dry and rainy season. Both morphotypes exhibited seasonal and vertical differences in densities. The reservoir was stratified in the dry season, with a predominance of the straight morphotype. The coiled morphotype exhibited greater densities in the lower strata and prove to be more susceptible to light. There was evident thermal de-stratification in the rainy season, with a predominance of the coiled morphotype in the surface layers. Thermal de-stratification favors an increase in both morphotypes by providing adequate conditions for growth, such as low light intensity and milder temperatures, which are characteristic of the winter season in the northeastern Brazil.
A??o do biofertilizante Agrobio sobre a mancha-bacteriana e desenvolvimento de mudas de piment?o
Deleito, Cláudia S.R.;Carmo, Margarida Goréte F. do;Fernandes, Maria do Carmo de A.;Abboud, Antonio Carlos de S.;
Horticultura Brasileira , 2005, DOI: 10.1590/S0102-05362005000100025
Abstract: the agrobio biofertilizer is prepared from fresh cattle manure, water, molasses and minerals in open containers. this product has been widely used by organic and conventional farmers of the rio de janeiro state to control several plant pathogens. this research aimed to elucidate and quantify some of the aspects related to the beneficial effect of agrobio on bell pepper (capsicum annuum l.) transplants under greenhouse conditions. two cultivars, 'cascadura ikeda' and 'cascadura itaipu' were used. four agrobio treatments, all diluted 5% (v/v) in distilled water were used. they consisted of: (a) raw; (b) autoclaved (120oc/20 min); (c) filtered in millipore (0,22 μ diameter) and (d) the fraction retained on the millipore. they were applied as foliage sprays or directly on the substrate. as control treatments, oxytetracicline + streptomycin sulphate (0.8 g l-1), copper oxichloride (2.4 g l-1) and water were used. raw of filtered agrobio, as a foliage spray, resulted in better control of the disease and higher growth of the transplants, compared to autoclaved and fraction retained of the agrobio and substrate sprays. all agrobio treatments resulted in a less satisfactory disease control when compared to the commercial products, copper oxichloride and oxitetracicline + streptomycin sulphate, but more, effective than water. agrobio stimulated the vegetative growth of the transplants, reduced the incidence of bacterial spot, increased the leaf area and promoted a better retention of infected leaves and the bacillus spp. population.
A??o bacteriostática do biofertilizante Agrobio in vitro
Deleito, Cláudia S.R.;Carmo, Margarida Goréte F. do;Fernandes, Maria do Carmo de A.;Abboud, Antonio Carlos de S.;
Horticultura Brasileira , 2005, DOI: 10.1590/S0102-05362005000200023
Abstract: agrobio is a biofertilizer prepared from fresh cattle manure, water, molasses and minerals, fermented under room temperature in open containers during 56 days. this product has been widely used by organic and conventional farmers throughout rio de janeiro state, brazil, to control several plant pathogens of various crops. the antibiotic effect of different concentrations of agrobio against xanthomonas euvesicatoria, in vitro vas evaluated. four bioassays were performed with three isolates of the bacterium. agrobio was tested in three preparation stages (35, 85 and 115 days of fermentation) and applied raw, filtered (0,22 μm) or autoclaved (120oc/20 minutes). the effect of the treatments was assessed by the diameter of the inhibition growth halo on petri dishes. agrobio presented bacteriostatic effect on x. euvesicatoria regardless of the sample age or pre-treatment. growth inhibition occurred above 5% concentration, indicating the feasibility of agrobio, as a bacterial leaf spot control agent, in early fermentation stages (35 days). field experiments are necessary to confirm these results.
Actividad antioxidante, compuestos fenólicos y ácido ascórbico de frutillas en dos sistemas de producción
Cantillano, Rufino Fernando F;ávila, Julia Maria M;Peralba, Maria do Carmo R;Pizzolato, Tania Mara;Toralles, Ricardo P;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000400010
Abstract: the aim of this study was to determine the influence of the crop production system and storage period on weight loss, total phenolic content, total anthocyanin content, ascorbic acid (vitamin c) content, and antioxidant activity in strawberries, as well as their correlations. for this experiment, strawberry fruits of 'camarosa' and 'camino real' at commercial maturity from both organic and conventional crop production systems located in pelotas, brazil, were used. the fruits were cold stored for 0, 2, 5, and 8 days at 1oc and 90-95% rh. in general the total phenolic, total anthocyanin levels and antioxidant activity increased during cold storage. ascorbic acid levels and fresh weight decreased significantly. total phenol and anthocyanin levels showed positive correlations with total antioxidant activity, while the ascorbic acid content showed a negative correlation. strawberries produced by the organic system and cold stored for five days showed higher values of antioxidant activity. after storage at 1oc for eight days, strawberry fruits from the organic production system presented lesser anthocyanin and ascorbic acid degradation than the fruits from the conventional production system.
Anti-acetylcholinesterase and Antioxidant Activity of Essential Oils from Hedychium gardnerianum Sheppard ex Ker-Gawl
Miguel Arruda,Hugo Viana,Nuno Rainha,Nuno R. Neng,José Silvino Rosa,José M. F. Nogueira,Maria do Carmo Barreto
Molecules , 2012, DOI: 10.3390/molecules17033082
Abstract: Acetylcholinesterase inhibition, antioxidant and cytotoxic activities of Hedychium gardnerianum leaf essential oils from S. Miguel Island were determined. All the oils inhibited acetylcholinesterase, with IC50 values of approximately 1 mg/mL, showing no statistical differences between collection sites. Three oils presented mixed inhibition, whilst one was almost truly competitive. This activity can be attributed to the presence of sesquiterpenes, which constituted more than 60% of the composition of the oils. Regarding the antioxidant activity as measured by the DPPH method, all the oils presented activities similar to reference compounds, although with statistical differences between collection sites. Cytotoxicity measured using Artemia salina classified these oils as moderately toxic, with LC50 values ranging from 300 to 500 μg/mL. These results indicate a possible application of these oils in aromatherapy as coadjuvants in the treatment of cognitive diseases such as Alzheimer, since they may contribute to increase acetylcholine in cholinergic neurons and simultaneously fight deleterious oxidations responsible by neurological degeneration.
Colheita, pós-colheita e embalagem de flores tropicais em Pernambuco
Loges, Vivian;Teixeira, Maria do Carmo F.;Castro, Ana Cecília R. de;Costa, Andreza S. da;
Horticultura Brasileira , 2005, DOI: 10.1590/S0102-05362005000300001
Abstract: pernambuco state produces tropical flowers (heliconiaceae, zingiberaceae, costaceae, araceae) mainly in the rain forest zone and coastal lands. the climatic conditions of the region favour the blooming and the obtaining of flowers with good color, size and quality. the flower industry in pernambuco is organized in associations and cooperatives and has increased in the last 10 years, due to private and governmental investments, giving to the farmers financial aid, research support and capacitation for exporting. this work describes the procedures used during harvest and postharvest manipulation of tropical flowers, with the objective of helping growers to reach new market niches.
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