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Search Results: 1 - 10 of 440515 matches for " Cíntia P. dos;Würdig "
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Fases larvais do mexilh?o dourado Limnoperna fortunei (Dunker) (Mollusca, Bivalvia, Mytilidae) na Bacia do Guaíba, Rio Grande do Sul, Brasil
Santos, Cíntia P. dos;Würdig, Norma L.;Mansur, Maria C. D.;
Revista Brasileira de Zoologia , 2005, DOI: 10.1590/S0101-81752005000300029
Abstract: since the end of 1998 a small invasive bivalve, the golden mussel limnoperna fortunei (dunker, 1857), originating from southeast asia, is present in southern brazil. it was probably brought not intentionally in ballast water to the guaíba basin in rio grande do sul state. in this environment, the golden mussel is causing macrofouling very rapidly with grate financial loss and damages to the native fauna and flora. quali-quantitative samplings twice a month were performed during one year in the guaíba lake, at veludo beach (30°12'35"s, 51°11'68"w) southward of the municipality of porto alegre. each time, 30 litters of water were filtered through plankton net with a mash opening of 36 mm. the different larval stages with the length parameters were briefly described. different stages were recognized: five without valves and four valved. the first one recognized as a ciliated stage develops into the trocophora (length from 80 μm to 125 μm) with four distinct stages. the valved stages include: the "d" - shaped (length 120 μm to 150 μm), the straight-hinged veliger (length 150 μm to 190 μm), umbonated-veliger (length 190 μm to 220 μm) and pediveliger (length 220 μm to 250 μm). when pos-larvae or plantigrades (length about 300 μm), they secrete the byssus thread that permit fixation on the subtract. larvae were present during all the samplings with strong october-december peaks.
Varia??es no comprimento dos indivíduos de uma popula??o do mexilh?o dourado, Limnoperna fortunei (Mollusca: Bivalvia: Mytilidae), ao longo do ano, na Praia do Veludo, Lago Guaíba, Rio Grande do Sul, Brasil
Santos, Cintia P. dos;Mansur, Maria Cristina D.;Würdig, Norma L.;
Revista Brasileira de Zoologia , 2008, DOI: 10.1590/S0101-81752008000300002
Abstract: the individual size of limnoperna fortunei (dunker, 1857) was evaluated twice a month, for a year, based on samples from veludo beach (30o12'35"s, 51o11'68"w) in guaiba lake, southern porto alegre, brazil. physical and chemical data on water quality, such as temperature, transparency, depth, ph, dissolved oxygen, phosphorus, nitrogen, chlorophyll "a", and conductivity were also recorded. adult samples were collected from underwater "sarandi" branches, cephalanthus glabratus (spreng) k. schum (rubiaceae), an aquatic macrophyte available at each site. adults placed on artificial substrates were also checked every six months. data were analyzed by applying multivariate statistics techniques related to the physical and chemical variables of the water and the density of individuals to estimate the patterns of the individual growth over the year. the adults were separated into three groups according to length classes: g1, g2 and g3 (groups 1 through 3). these three groups are related to the differences in behavior, namely, the ability of locomotion and fixation capacity. individuals from group 1 (5 to 7 mm in length) were the most abundant and were present in all the sampled months. adults from artificial substrates were shown to display significant differences in seasonal growth and faster growth during spring and summer months.
Sources of resistance against the Pepper yellow mosaic virus in chili pepper
Bento, Cíntia dos S;Rodrigues, Rosana;Zerbini Júnior, Francisco Murilo;Sudré, Cláudia P;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000200013
Abstract: the pepper yellow mosaic virus (pepymv) naturally infects chili and sweet pepper, as well as tomato plants in brazil, leading to severe losses. this work reports the reaction to the pepymv of 127 capsicum spp. accessions, aiming at identifying resistance sources useful in breeding programs. the experiment was carried out in a completely randomized design, with eight replications, in greenhouse conditions. plants were protected with an insect-proof screen to avoid virus dissemination by aphids. leaves of nicotiana debneyi infected with the pepymv were used as the inoculum source. plants were inoculated with three to four fully expanded leaves. a second inoculation was done 48 hours later to avoid escapes. only the youngest fully expanded leaf was inoculated. two plants were inoculated only with buffer, as negative control. symptoms were visually scored using a rating scale ranging from 1 (assymptomatic plants) to 5 (severe mosaic and leaf area reduction). nine accessions were found to be resistant based on visual evaluation. their resistance was confirmed by elisa. two resistance accessions belong to the species c. baccatum var. pendulum, while the seven other were c. chinense. no resistant accessions were identified in c. annuum var. annuum, c. annuum var. glabriusculum, and c. frutescens.
Effects of Cadmium on Growth, Photosynthetic Pigments, Photosynthetic Performance, Biochemical Parameters and Structure of Chloroplasts in the Agarophyte Gracilaria domingensis (Rhodophyta, Gracilariales)  [PDF]
Rodrigo W. dos Santos, éder C. Schmidt, Roberta de P. Martins, Alexandra Latini, Marcelo Maraschin, Paulo A. Horta, Zenilda L. Bouzon
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.38129
Abstract: This paper aimed to evaluate the effects of different concentrations of cadmium on growth rates, photosynthetic pigments, photosynthetic performance, biochemical parameters and structure of chloroplasts in G. domingensis. To accomplish this, apical segments of G. domingensis were cultivated with different concentrations of cadmium, ranging from 100 to 300 μM, over a period of 16 days, and were processed for transmission electron microscopy analysis. The plants exposed to cadmium showed chloroplast alteration, especially degeneration of thylakoids and a decrease in the concentration of photosynthetic pigments, such as chlorophyll a and phycobiliproteins. However, the volume of plastoglobuli increased. As a defense mechanism, the plants treated with cadmium showed an increase in glutathione reductase activity. These results agree with the decreased photosynthetic performance and relative electron transport rate observed after exposure of algae to cadmium. Taken together, these findings strongly indicate that cadmium negatively affects the ultrastructure and metabolism of the agarophyte G. domingensis, thus posing a threat to the economic vitality of this red macroalga.
Divergência genética em tomate estimada por marcadores RAPD em compara??o com descritores multicategóricos
Gon?alves, Leandro SA;Rodrigues, Rosana;Sudré, Cláudia P;Bento, Cíntia dos S;Moulin, Monique M;Araújo, Maria Luiza de;Daher, Rogério F;Pereira, Telma Nair S;Pereira, Messias G;
Horticultura Brasileira , 2008, DOI: 10.1590/S0102-05362008000300014
Abstract: the estimation of genetic variability in a germplasm bank is important not only for the conservation of the genetic resources, but also for applications in plant breeding. the genetic divergence among 78 tomato accessions was studied, based on 74 rapd markers. also, a correlation between the molecular profile and 27 morphological and agronomic data was performed. cluster analysis (upgma), used to study the data, resulted in 13 groups that were correlated with five descriptors (growth habit, leaf type, fruit color, locule number, and fruit shape). some groups had particularities, such as group iv that assembled accessions with pear shape fruits; group vii, that clustered accessions with bacterial wilt resistance, and group ix, that gathered accessions with potato leaf type. bootstrap analysis revealed few consistent clusters. the results showed a positive and significant correlation between the matrixes generated out of qualitative and molecular data (t = 14.02). mantel's correlation was highly significant, but with a low value (r = 0.39), which suggests that for a wise use of the germplasm bank accessions, both characterization, molecular and morphoagronomic, should be carried out.
Crescimento e produtividade agrícola de cana-de-a?úcar em diferentes fontes de fósforo
Santos, Valdevan R. dos;Moura Filho, Gilson;Albuquerque, Abel W. de;Costa, José P. V. da;Santos, Cícero G. dos;Santos, Alda C. I. dos;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2009, DOI: 10.1590/S1415-43662009000400004
Abstract: this work had as its objective in the evaluation of the growth and production of the sugarcare plant under different phosphorus sources. the experiment was carried out in coruripe, al, brazil with 10 fertilizer treatments: 1) control; 2) nk + micronutrient; 3) super phosphate simple; 4) triple super phosphate; 5) fosmag; 6) gafsa; 7) map; 8) npk 06-26-24 (460 kg ha-1); 9) compost and 10) simple super phosphate - splitdose. the experiment was in random blocks, with four replicates. parameters evaluated were: number of tillers, height of plants, iaf, rate of stalk growth, rate of biomass production of the stalk, relative growth rate, production and p in leaf and available in soil. p sources did not show any significant influence upon the growth of cane-plant due to the residual effect of previous manuring, with average yield of 80 t ha-1. the triple super phosphate produced the best production in the cane-plant, which presented three growth phases: 1st phase: intense tillering until 120 days after planting (dap); 2nd phase:intense growth between 120 and 240 dap; and 3rd phase: maturation, between 240 and 360 dap. the major growth rate and fresh matter stalk production occurred after intense tillering phase between 120 and 240 dap.
Molecular characterization of the Corynebacterium pseudotuberculosis hsp60-hsp10 operon, and evaluation of the immune response and protective efficacy induced by hsp60 DNA vaccination in mice
Marcilia P Costa, John A McCulloch,ntia S Almeida, Fernanda A Dorella, Cristina T Fonseca, Diana M Oliveira, Maria FS Teixeira, Ewa Laskowska, Barbara Lipinska, Roberto Meyer, Ricardo W Portela, Sérgio C Oliveira, Anderson Miyoshi, Vasco Azevedo
BMC Research Notes , 2011, DOI: 10.1186/1756-0500-4-243
Abstract: To construct the DNA vaccine, the hsp60 gene of C. pseudotuberculosis was cloned in a mammalian expression vector. BALB/c mice were immunized by intramuscular injection with the recombinant plasmid (pVAX1/hsp60).This vaccination induced significant anti-hsp60 IgG, IgG1 and IgG2a isotype production. However, immunization with this DNA vaccine did not confer protective immunity.Corynebacterium pseudotuberculosis is a facultative, intracellular, Gram-positive bacterium of the class Actinobacteria, which also includes the genera Mycobacterium, Nocardia and Rhodococcus. The latter three genera, together with Corynebacterium, form a group of potentially pathogenic species termed the CMN group. Corynebacterium pseudotuberculosis is the etiological agent of caseous lymphadenitis (CLA), or cheesy gland, which affects small ruminants (sheep and goats) and occasionally other hosts. This chronic disease is pathognomonically characterized by the formation of suppurative abscesses in superficial and internal lymph nodes. In severe cases, these abscesses are also found in internal organs, such as the lungs, kidneys, liver and spleen, characterizing visceral CLA [1]. The economic relevance of CLA, its widespread occurrence, and a lack of knowledge regarding its molecular mechanisms of virulence, have prompted the investigation of its pathogenesis with the aim to develop efficient treatment strategies against this disease [2].Chemotherapeutic treatment of CLA is difficult because the bacteria are shielded within granulomas, where they are relatively protected from antibiotic drugs [3]. Therefore, attempts to control CLA usually entail immunoprophylaxis by vaccination. Various strategies have been used for developing vaccines against CLA, including the use of inactivated or attenuated C. pseudotuberculosis strains [4,5], fractions of bacterial cells containing bacterial antigens, antigens from culture supernatants, and DNA vaccines [6]. None of the currently commercially available va
Depressive symptoms and C-reactive protein in a Brazilian urban community
Dressler, W.W.;Balieiro, M.C.;Ribeiro, R.P.;Dos-Santos, J.E.;
Brazilian Journal of Medical and Biological Research , 2006, DOI: 10.1590/S0100-879X2006000800003
Abstract: psychological depression is an independent risk factor for coronary artery disease. c-reactive protein has been implicated as a mediator of the effect of psychological depression. several studies have found that individuals, especially men, who report higher levels of psychological depression also have higher levels of c-reactive protein. the current study was undertaken to replicate these results in a brazilian population, in which there is a much wider range of variation in both background characteristics (such as socioeconomic status) and coronary artery disease risk factors. a sample of 271 individuals was interviewed using the center for epidemiological studies depression scale. fasting blood samples were obtained and evaluated for c-reactive protein (assessed by a turbidimetric immunoassay using a dade behring kit) analysis in a subsample (n = 258) of individuals. the mean ± sd c-reactive protein for the entire sample was 0.43 ± 0.44, with 0.42 ± 0.48 for men and 0.43 ± 0.42 mg/l for women. data were analyzed using multiple regression analysis, controlling for age, sex, body mass index, socioeconomic status, tobacco use, and both total cholesterol and low-density lipoprotein cholesterol. higher reported depressive symptoms were correlated with higher c-reactive protein for men (partial r = 0.298, p = 0.004) and with lower c-reactive protein for women (partial r = -0.154, p = 0.059). the differences in the associations for men and women could be a result of differential effects of sex hormones on stress reactivity and immune response. on the other hand, this difference in the associations may be related to gender differences in the disclosure of emotion and the effect that self-disclosure has on physical health and immune response.
Confrontación de criterios de evaluación del aprendizaje ante las apreciaciones de los estudiantes de enfermería
Tanji,S.; Lopes Monteiro Dantas da Silva,C.M. dos S.; Vieira dos Santos Esteves,A.P.; Rodrigues de Oliveira,W.; De Paula,C.;
Enfermería Global , 2010, DOI: 10.4321/S1695-61412010000100008
Abstract: the objective of this study is not only to research the students' perceptions of this new assessment format but also its impact in their learning. the study took place in a university in rio de janeiro, brazil; the participants were 26 students from the third part of nursing studies. data collection was made through an instrument with open questions carried out from april to may of 2008. results were analyzed and described in a thematic unit. three thematic units elaborated are: the evaluation process facilitates a reliable assessment of knowledge, the students' learning; the evaluation process facilitates a critical reflection of the questions; the assessment form requires more student effort. the students' perceptions regarding the evaluation process follow the new perspectives of the curriculum guidelines of nursing studies, mainly in regards to educating critical and reflexive professionals.
Cultura da soja em fun??o da profundidade de semeadura e da carga vertical sobre a fileira de semeadura
Grotta, Danilo C. C.;Furlani, Carlos E. A.;Silva, Rouverson P.;Santos, Leonardo dos;Cortez, Jorge W.;Reis, Gustavo N. dos;
Engenharia Agrícola , 2007, DOI: 10.1590/S0100-69162007000300018
Abstract: the choice of a soil tillage system, aiming the best use and integration between soil and crop, is very difficult. the objective of the present work was to evaluate vertical loads (0; 98; 196 and 294 n) on the press wheels of the seeders working at sowing depths (0.03; 0.05 and 0.07 m) for the soybean. the work was carried out at rural engineering department of unesp - s?o paulo state university, jaboticabal, brazil, in the machines and mechanization laboratory?s area. the experiment design was 4x3 factorial in randomized blocks with three replications, totalling 12 treatments and 36 observations. the emergence, initial and final population of cultivation, index of surving plants, immobilized area in sowing and the yield grain were analyzed. the results showed that, except for mobilized area concerning the working depth of sowing shaft, all the other variables were not influenced by the treatments.
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