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Search Results: 1 - 10 of 368937 matches for " Cristiane S.;Silva "
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Morphological and chemical aspects of Chlorella pyrenoidosa, Dunaliella tertiolecta, Isochrysis galbana and Tetraselmis gracilis microalgae  [PDF]
Cristiane Mesquita da Silva Gorg?nio, Donato Alexandre Gomes Aranda, S?nia Couri
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.57094
Abstract:

This study evaluates the growth and chemical composition of the following marine microalgae: Dunaliella tertiolecta, Isochrysis galbana, and Tetraselmis gracilis and the chemical composition of Chlorella pyrenoidosa. Microalgae can produce a number of compounds of high commercial value for the industry, mainly for the food industry. The growth kinetics, cell volume, pigments, carbohydrates, proteins, lipids, and fatty acid and amino acid composition were evaluated. I. galbana had the largest number of cells per mL-1 (107), concentration of carotenoids (6.33 μg·mL-1), and carbohydrates (34.32%). D. tertiolecta and T. gracilis had the highest cell volume (560.6 and 592.7 μm3, respectively), the highest amount of total dry biomass. D. tertiolecta

Downeshela oliveirai, a new neotropical predaceous midge from northern Brazil (Diptera, Ceratopogonidae)
Felippe-Bauer, Maria L.;Silva, Cristiane S.;
Iheringia. Série Zoologia , 2008, DOI: 10.1590/S0073-47212008000300016
Abstract: a new species of downeshelea wirth & grogan, 1988, d. oliveirai, is described and illustrated based on male and female characteristics. the specimens were collected in rond?nia and pará states, northern brazil.
Morphological alterations in Neotropical Ceratopogonidae (Diptera)
Felippe-Bauer, Maria L.;Silva, Cristiane S.;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000300001
Abstract: morphological alterations in six different species of females culicoides latreille, 1809 and one of monohelea kieffer, 1917 from brazil, mexico, panama and peru are described. the correlation of the morphological changes with the taxonomy and behavior of the species is discussed.
Antifungal activity of the lemongrass oil and citral against Candida spp.
Silva, Cristiane de Bona da;Guterres, Sílvia S.;Weisheimer, Vanessa;Schapoval, Elfrides E.S.;
Brazilian Journal of Infectious Diseases , 2008, DOI: 10.1590/S1413-86702008000100014
Abstract: superficial mycoses of the skin are among the most common dermatological infections, and causative organisms include dermatophytic, yeasts, and non-dermatophytic filamentous fungi. the treatment is limited, for many reasons, and new drugs are necessary. numerous essential oils have been tested for both in vitro and in vivo antifungal activity and some pose much potential as antifungal agents. by using disk diffusion assay, we evaluated the antifungal activity of lemongrass oil and citral against yeasts of candida species (candida albicans, c. glabrata, c. krusei, c. parapsilosis and c. tropicalis). this study showed that lemongrass oil and citral have a potent in vitro activity against candida spp.
Distribution of lipid compounds in sediments from Concei??o Lagoon, Santa Catarina Island, Brazil
Silva, Cesar A.;Oliveira, Cristiane R.;Oliveira, Inês R. W. Z.;Madureira, Luiz A. S.;
Journal of the Brazilian Chemical Society , 2008, DOI: 10.1590/S0103-50532008000800010
Abstract: lipid compounds from five sediment-water interface samples and a sediment core with 75 cm depth were used to assess sources of organic matter in concei??o lagoon, located on santa catarina island. the results which were based on the molar c:n:p ratios, relative abundance of sterols (dominated by the c27 sterols), n-alkanols (0.2-1.2 μg g-1), n-alkanes (0.4-5.0 μg g-1) and the carbon preference index (cpi), indicated that the organic matter is predominantly of terrestrial origin (c/n > 10 and cpi > 2). total phosphorus (tp, average 5.20 μmol g-1) and organic carbon (toc, average 2.90 mmol g-1) contents were well correlated with the silt and clay fractions at all locations. in the sediment core, chronologically dated with the radionuclide 210pb, the depth interval from 55 to 75 cm was dominated by the sand fraction (> 50%). however, parameters such as toc, tp and n-alkane contents increased considerably at this depth suggesting a change in organic matter input sources.
Systematic study of the employment of enzymatic catalysts on the formation of carbon-heteroatoms Estudo sistemático do emprego de catalisadores enzimáticos na forma o de liga es carbono-heteroátomos
Paula Vanessa S. Rizzo,Ana Claudia S. Lima,érica Cristina da Silva,Cristiane R. Winck
Orbital : the Electronic Journal of Chemistry , 2012,
Abstract: The classic thio-Michael reaction is the one that involves the addition of a sulfur atom like the nucleophile of the reaction to an electrophile α,β -insaturated. There are many reports in the literature which describe the need of the electrophile activation using, for instance, Lewis acid. However, there is a slope that aims this activation using biocatalysts such as enzymes. In this sense, this study aimed to analyze some enzymes on the thio-Michael reaction. Some biocatalysts were tested such as the enzymes like Lipase, Lipozye and Chymosine (Figure 1). The reactions results indicated that the application of these biocatalysts proportioned a shorter reaction time from one day to four hours with high yield levels. A rea o clássica de tia-Michael é a que envolve a adi o de um átomo de enxofre como nucleófilo da rea o a um eletrófilo α,β-insaturado. Muitos s o os relatos da literatura que descrevem a necessidade de ativa o do eletrófilo utilizando-se, por exemplo, ácidos de Lewis. Porém há recentemente uma vertente que visam esta ativa o utilizando-se biocatalisadores como enzimas. Nesse sentido, este estudo objetivou analisar algumas enzimas na rea o de tia-Michael. Neste foram testados como biocatalisadores as enzimas Lipase, Lipozyme e Quimosima (Figura 1). Os resultados das rea es indicaram que a aplica o destes biocatalisadores proporcionou um menor tempo reacional de um dia para 4 horas com altos níveis de rendimento.
Interaction between Bees and the Tristylous Flowers of Oxalis cytisoides Mart. & Zucc. (Oxalidaceae)
Cristiane Krug,Cláudia Inês Silva,Isabel Alves-dos-Santos
Psyche , 2012, DOI: 10.1155/2012/459683
Abstract: The interaction of bees with the tristylous flowers of Oxalis cytisoides Mart. & Zucc. (Oxalidaceae) was evaluated. The study was conducted in a semideciduous forest at the Fritz Plaumann State Park in Concórdia, Santa Catarina state. Two Oxalis cytisoides aggregations were found and the flower visiting bees were observed. The 3 floral morphs were found at the following proportions: 16 long-, 37 mid-, and 34 shortstyled individuals ( ). Anthesis lasted one day (6:30 AM to 3 PM). No fruit was formed in the autogamy test; thus, pollination was dependent on the visitors. The pollen grain size varied between the stamens and morphs and formed subsets in accordance with the stigma height (long/mid/short). We collected 165 bees from 30 species visiting the flowers. Hypanthium divaricatum was the most abundant bee species (34%) and the males were often observed patrolling the flowers in search of females for mating. Analysis of the pollen loads from 34 females showed that 27 carried O. cytisoides pollen. The most frequent bees that carried O. cytisoides pollen grains on their bodies were considered pollinator agents, responsible for transferring pollen grains among the floral morphs. 1. Introduction Heterostyly is a rare phenomenon among plants that has been observed in 28 angiosperm families [1]. Heterostylous species have flowers with different morphs in their populations and may be distylous or tristylous. Each plant holds just one type of flowers. Tristyly is a more complex and rare type of heterostyly, which has been reported in seven botanical families, including Oxalidaceae [1–5]. Charles Darwin formulated an explanation for the adaptive function of heterostyly in 1877, which suggested that the anthers and stigma were positioned to promote cross-pollination between the floral morphs. Darwin [6] also reported observations from Fritz Müller in Santa Catarina for the genus Oxalis, who found that flowers do not produce seeds at sites with only one floral morph. However, when the three morphs were planted in a garden, many seeds were produced. The tristyly species comprises three floral morphs that differ in stamen filament height, pistil style position, pollen grain size and self-compatibility systems. Cross-pollination mediated by insect visitors is favored for this type of flowers [2, 6–9]. The three floral morphs in tristyly populations likely represent the maximum number of sexual polymorphisms in plants that promote cross-pollination through pollinator contact geometry [10]. For legitimate cross-pollination plant requires vectors able to transfer pollen
Uso da lógica fuzzy na caracteriza??o do ambiente produtivo para matrizes gestantes
Pandorfi, Héliton;Silva, Iran J. O.;Guiselini, Cristiane;Piedade, Sonia M. S.;
Engenharia Agrícola , 2007, DOI: 10.1590/S0100-69162007000100001
Abstract: the objective of this research was to estimate the environment of housing systems for pregnant sows, as well as variables that have effect on production system. the trial was conducted out from january 4th to march 11th 2005 in a specialized farm in industrial production of pork, located in elias fausto city, s?o paulo state. in gestation facility 24 gilts were allocated: 12 in individual stalls (t1) and 12 in group housing (t2). basically, this study was divided in two steps in function of the way chosen for data analysis: bioclimatic and air quality analysis; and prediction for environmental thermal comfort patterns. the environmental variables (t, oc; ur, %; tgn, oc) and physiological (respiratory rate, mov min-1; rectal temperature, oc) indicated that the group housing led to be the better natural thermal environment for pregnant gilts. the fuzzy set theory permitted to compare experimental data with those reported in the literature through rules that establish environment thermal comfort for sows during gestation.
The Seroprevalence of Equine Trypanosomosis in the Pantanal
Dávila, Alberto MR;Souza, Silvana S;Campos, Cristiane;Silva, Roberto Aguilar MS;
Memórias do Instituto Oswaldo Cruz , 1999, DOI: 10.1590/S0074-02761999000200014
Abstract: since little information is available on the epizootiological status of trypanosoma evansi in south america and particularly brazil, we evaluated equine serum samples collected in 1993, 1994, 1995 and 1997 for the presence of antibodies against this trypanosome species. our study shows corroborative evidence about the correlation among high t. evansi seroprevalence and the rainy season in the pantanal, brazil. the higher seroprevalence was 79.2% in horses from a ranch located in the nhecolandia sub-region in 1994 and the lower 5.8% in animals from the same ranch in 1997. no seroprevalence was found in 1993. the possible re-introduction of t. evansi in the region as well as the relationship among our results with the outbreaks reported in 1994, are briefly discussed.
New approaches toward anti-Rhipicephalus (Boophilus) microplus tick vaccine
Parizi, Luís Fernando;Pohl, Paula Cristiane;Masuda, Aoi;Vaz Junior, Itabajara da Silva;
Revista Brasileira de Parasitologia Veterinária , 2009, DOI: 10.4322/rbpv.01801001
Abstract: the tick rhipicephalus (boophilus) microplus (formerly boophilus microplus) is the major ectoparasite affecting livestock in america, asia, africa, and oceania. conventional tick control is based on the use of acaricides but immunization of bovines with tick gut proteins induces only a partial protective immune response. based on this information, distinct research groups have explored the possibility of protecting the animals by inducing an immune response against other tick proteins. however, the antigens so far described do not induce the necessary protection for suppressing the use of acaricides. currently, several groups are engaged in identifying new tick proteins to be used as targets for the development of new vaccines. this approach focuses on the enhancement of the immunogenicity of antigens already tested by incorporating new adjuvants or formulations and by searching for new antigens. this paper reviews the work done by brazilian researchers to develop a vaccine against this tick.
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