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Search Results: 1 - 10 of 552551 matches for " Andréa Carlos Bekner da;Mitsuka "
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Comportamento imunológico e antigênico de cinco amostras de Toxoplasma gondii inoculadas em gatos
Navarro, Italmar Teodorico;Vidotto, Odilon;Silva, Andréa Carlos Bekner da;Mitsuka, Regina;Jankevicius, José Vitor;Shida, Paula Namie;Cortês, José de Angelis;
Ciência Rural , 1998, DOI: 10.1590/S0103-84781998000300017
Abstract: the biology of toxoplasma gondii demonstrate that cats are the complete host responsable for the dissemination of this parasites. two domestic cats were immunised with toxoplasma gondii strains vps (human), liv-iv and liv-v (porcine), cpl (caprine) and cn (feline). live tachyzoites were utilized in intravenous inoculation of 2x107 (first inoculum) and 4x107 (second inoculum - 35 days later), except for strain vps, where one cat died 10 days after the first inoculation and another showed symptoms of acute toxoplasmosis. in all other strains, no clinical signs were detected during 6 months of observation. the antibody response after immunization was monitored by indirect immunofluorescence (if) test by the use of anti-cat igg conjugate. the antibody titers obtained at the 20th day varied from 1:1,024 to 1:4,096 and from 1:1,024 to 1:8,000 at the 40th day. only the vps strain attained titers of 1:16,000 at the 30th day of immunization. homologous and heterologos titers were equivalem without any difference among the strain. when the immune sera were adsorbed with live tachyzoites, a reduction in the antibody titers was demonstrated both in homologous and heterologous levels. these results suggest that although dijferences in virulence for cats are evident among the strains. the surface antigens are commom among the t. gondii strains on the basis of if antibody level. the results also demonstrated that apparently there is no correlation between virulence and serological characteristics of the studied strains of toxoplasma gondii. however the importance of the if test in the laboratorial diagnosis of toxoplasmosis is reinforced.
Distribution of Nutrients and Changes in Phytoplankton Composition in a Tropical Mesotidal Estuary, Northeastern Brazil  [PDF]
Andréa Shirley Xavier da Silva, Carlos Noriega, Maria Luise Koening, Manuel Flores Montes, Moacyr Araujo
Open Journal of Ecology (OJE) , 2017, DOI: 10.4236/oje.2017.77032
Abstract: Abiotic parameters and phytoplankton were collected during 2010 and 2011 with the purpose of describing the phytoplankton distribution and the environmental characteristics. The diatoms were the most representative group in terms of species richness; in terms of density, the Cyanobacteria were more representative. Diversity and equitability were generally low in the estuary due to the dominance of Microcystis aeruginosa, an opportunistic and potentially toxic species of Cyanobacteria. The estuarine region is strongly impacted by high pollutant loads, especially nitrogen and phosphate compounds. Historical series of Apparent Oxygen Utilization (AOU) showed negative trends associated with changes in the estuarine system. The main biological components changed through 1999-2011 period. The dominance of the species changed from the Bacillariophyta in previous studies to the Cyanobacteria in our study. The species Microcystis aeruginosa, through its high density, dominance and frequency of occurrence, was the key species in the area.
Hipotermia induzida na encefalopatia hipóxico-isquémica
Gra?a,André Mendes da; Sampaio,Isabel; Moniz,Carlos;
Nascer e Crescer - Revista do Hospital de Crian?as Maria Pia , 2011,
Abstract: a hipotermia induzida (hi) é considerada actualmente a terapêutica neuroprotectora de elei??o para a encefalopatia hipoxico-isquémica (ehi) moderada a grave no recém-nascido (rn) de termo, já existindo experiência considerável na sua utiliza??o em contexto clínico. consiste na redu??o da temperatura corporal para valores entre 33 e 34oc durante 72 horas, seguida de um reaquecimento progressivo. no momento actual tornou-se crucial que todos os médicos que prestam assistência ao recém-nascido conhe?am as indica-??es para este tratamento e as especificidades da abordagem inicial destes doentes, sendo imprescindível iniciar medidas de hipotermia passiva no local de nascimento, que devem ser man-tidas durante o transporte. o primeiro programa nacional de hi na ehi iniciou-se na unidade de cuidados intensivos neonatais do servi?o de neo-natologia do hospital de santa maria (ucin-hsm) em novembro de 2009. foram tratados nos primeiros 18 meses do programa 29 doentes oriundos de todo o território continental do país. a mediana da idade gestacional foi de 39 semanas, identificando-se um evento agudo intra-parto em cerca de um ter?o dos ca-sos. todos necessitaram de reanima??o avan?ada e apresenta-ram evidência de acidose metabólica na primeira hora de vida. na admiss?o metade apresentavam encefalopatia grave, nove moderada e seis ligeira. a hipotermia passiva iniciou-se no hos-pital de origem antes das três horas de vida e a hipotermia activa iniciou-se sempre antes das 12 horas de vida (mediana de seis horas). durante o tratamento todos os rn estiveram monitoriza-dos com electroencefalograma de amplitude integrada (aeeg), sedados e com suporte ventilatório. ocorreram convuls?es em 22 rn, hipotens?o arterial em 21 e insuficiência renal aguda em nove. o prognóstico baseado na evolu??o clínica, na monitoriza-??o com aeeg e na rmn-ce, considerou-se favorável em oito rn, intermédio em quatro e adverso em 12 casos. cinco rn faleceram, dois ainda durante o tratamento. a implementa?
All-ceramic and porcelain-fused-to-metal fixed partial dentures: a comparative study by 2D finite element analyses
Motta, Andréa Barreira;Pereira, Luiz Carlos;Cunha, Andréia R.C.C da;
Journal of Applied Oral Science , 2007, DOI: 10.1590/S1678-77572007000500005
Abstract: all-ceramic fixed partial dentures (fpds) have an esthetic approach for oral rehabilitation. however, metal-ceramic fpds are best indicated in the posterior area where the follow-up studies found a lower failure rate. this 2d finite element study compared the stress distribution on 3-unit all-ceramic and metal-ceramic fpds and identified the areas of major risk of failure. three fpd models were designed: (1) metal-ceramic fpd; (2) all-ceramic fpd with the veneering porcelain on the occlusal and cervical surface of the abutment tooth; (3) all-ceramic fpd with the veneering porcelain only on the occlusal surface. a 100 n load was applied in an area of 0.5 mm2 on the working cusps, following these simulations: (1) on the abutment teeth and the pontic; (2) only on the abutment teeth; and (3) only on the pontic. relative to the maximum stress values found for the physiological load, all-ceramic fpd with only occlusal veneering porcelain produced the lowest stress value (220 mpa), followed by all-ceramic fpd with cervical veneering porcelain (322 mpa) and metal-ceramic fpd (387 mpa). the stress distribution of the load applied on the abutments was significantly better compared to the other two load simulations. the highest principal stress values were low and limited in a small area for the three types of models under this load. when the load was applied on the pontic, the highest stress values appeared on the connector areas between the abutments and pontic. in conclusion, the best stress values and distribution were found for the all-ceramic fpd with the veneering porcelain only on the occlusal surface. however, in under clinical conditions, fatigue conditions and restoration defects must be considered.
Análise comparativa entre geradores síncronos e geradores de indu??o com rotor tipo gaiola de esquilo para aplica??o em gera??o distribuída
Freitas, Walmir;Vieira Jr., José Carlos M.;Fran?a, André Morelato;Silva, Luiz Carlos P. da;Costa, Vivaldo F. da;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2005, DOI: 10.1590/S0103-17592005000300006
Abstract: this paper presents a detailed comparative analysis between synchronous and induction machines for distributed generation applications. the impacts of these generators on the performance of distribution networks are determined and compared by using different computational simulation tools and models.the technical factors analyzed are steady state voltage profile, electrical losses, voltage stability, transient stability, voltage sags due to unbalanced faults and short-circuit currents. the results show that the most suitable choice depends on the network technical characteristics, i.e. what are the main operating restrictions related to distributed generation.
Disponibilidade de micronutrientes em cinco solos em fun??o do tempo de incuba??o de um composto de lixo
Silva, Fábio C. da;Silva, Carlos A.;Bergamasco, Alessandra F.;Ramalho, André L.;
Engenharia Agrícola , 2006, DOI: 10.1590/S0100-69162006000100025
Abstract: the agricultural use of urban waste compost (wc) is an alternative for a better environmental-economic viability, because this organic residue is a source of nutrients and organic matter. this study was carried out in a greenhouse at the brazilian agricultural research corporation/national soil research center. it had the objective of evaluating the effect of wc doses (0; 25; 50 and 100 mg ha-1) and incubation periods (16; 32; 64 and 150 days) on micronutrients availability cu, fe, mn and zn by mehlich-1, in rio de janeiro and sao paulo soils (red-yellow latosol, red-yellow podzol, chernossolo haplico órtico, planosol and red dusky podzol). most of the micronutrients had their availability reduced at the beginning of incubation, which was dependent of the texture, ph and organic matter content in the soil. continued use of wc, mainly in the highest doses, and especially for the mn and zn, can result in risks of soil contamination, in periods more than 6 months with reduction of availability of the elements.
In vitro analysis of the influence of surface treatment of dental implants on primary stability
Mazzo, Carla Rodrigues;Reis, Andréa Candido dos;Shimano, Antonio Carlos;Valente, Mariana Lima da Costa;
Brazilian Oral Research , 2012, DOI: 10.1590/S1806-83242012005000006
Abstract: surface treatment interferes with the primary stability of dental implants because it promotes a chemical and micromorphological change on the surface and thus stimulates osseointegration. this study aimed to evaluate the effects of different surface treatments on primary stability by analyzing insertion torque (it) and pullout force (pf). eight samples of implants with different surface treatments (ts - external hexagon with acid surface treatment; and ms - external hexagon, machined surface), all 3.75 mm in diameter x 11.5 mm in length, were inserted into segments of artificial bones. the it of each sample was measured by an electronic torquemeter, and then the pullout test was done with a universal testing machine. the results were subjected to anova (p < 0.05), followed by tukey's test (p < 0.05). the it results showed no statistically significant difference, since the sizes of the implants used were very similar, and the bone used was not highly resistant. the pf values (n) were, respectively, ts = 403.75 ± 189.80 and ms = 276.38 ± 110.05. the implants were shown to be different in terms of the variables of maximum force (f = 4.401, p = 0.0120), elasticity in maximum flexion (f = 3.672, p = 0.024), and relative stiffness (f = 4.60, p = 0.01). in this study, external hexagonal implants with acid surface treatment showed the highest values of pullout strength and better stability, which provide greater indication for their use.
Express?o das proteínas p53 e Cox-2 em adenocarcinoma intestinal e mucosa adjacente
Felin, Carlos Roberto;Rocha, Adriana Brondani da;Felin, Izabella Paz Danezi;Regner, Andréa;Grivicich, Ivana;
Revista Brasileira de Coloproctologia , 2008, DOI: 10.1590/S0101-98802008000100002
Abstract: the objective of this study is to establish a possible association between staging and the expression of p53 and cyclooxygenase-2 (cox-2) proteins in intestinal adenocarcinoma. a retrospective study of 40 embedded paraffins with surgical specimens of intestinal adenocarcinoma was performed. the samples were collected during 1998 and 2003 at hospital universitário de santa maria, rs, brasil. samples of non-tumoral tissues (n = 40) were used as a negative control. the expression of p53 and cox-2 was immunohistochemically studied. the expression of p53 and cox-2 proteins was significantly higher in the tumor material when compared to the normal adjacent mucosa. cox-2 expression was found in 100% of tumoral cases, while p53 expression was noted in 70% of tumor blocks. there is significantly association between the expression of p53 protein and astler-coller staging, but no with tnm-stage. there was no significant correlation between cox-2 expression and intestinal adenocarcinoma staging. our findings suggest that the expression of p53 and cox-2 proteins could have association with astler-coller staging.
Renova??o do carbono-13 em figueiras 'Roxo de Valinhos'
Silva, Andréa Carvalho da;Souza, Adilson Pacheco de;Ducatti, Carlos;Leonel, Sarita;
Revista Brasileira de Fruticultura , 2011, DOI: 10.1590/S0100-29452011005000059
Abstract: the aim of this study was to assess carbon-13 turnover in different organs of the fig tree cultivar 'roxo de valinhos'. the experiment was carried out in an orchard at school of agronomical sciences, fca/unesp, botucatu campus, s?o paulo state, brazil. the main photosynthetically active leaf was previously determined based on gas exchanges by means of an open portable photosynthesis system, irga. that leaf was placed in a chamber where the enriched gas injection occurred. the leaf enrichment time was 30 minutes. treatments were constituted of seven fig trees harvested of soil after: 6; 24; 48; 72; 120; 168 and 360 hours of enrichment using 13c, and their parts were sectioned into: apical bud, young leaves, adult leaves (photosynthetically active), lateral sprouts, fruits, and branch. the results allowed the establishment of the carbon-13 metabolism sequence in the studied parts: young leaves > fruits > sprouts > adult leaves > apical bud > branch > labeled leaf. fig trees 'roxo de valinhos' had 13c turnover of 24 hours and carbon-13 half-time shorter than 11 hours.
In vitro analysis of the influence of surface treatment of dental implants on primary stability
Carla Rodrigues Mazzo,Andréa Candido dos Reis,Antonio Carlos Shimano,Mariana Lima da Costa Valente
Brazilian Oral Research , 2012,
Abstract: Surface treatment interferes with the primary stability of dental implants because it promotes a chemical and micromorphological change on the surface and thus stimulates osseointegration. This study aimed to evaluate the effects of different surface treatments on primary stability by analyzing insertion torque (IT) and pullout force (PF). Eight samples of implants with different surface treatments (TS - external hexagon with acid surface treatment; and MS - external hexagon, machined surface), all 3.75 mm in diameter X 11.5 mm in length, were inserted into segments of artificial bones. The IT of each sample was measured by an electronic torquemeter, and then the pullout test was done with a universal testing machine. The results were subjected to ANOVA (p < 0.05), followed by Tukey's test (p < 0.05). The IT results showed no statistically significant difference, since the sizes of the implants used were very similar, and the bone used was not highly resistant. The PF values (N) were, respectively, TS = 403.75 ± 189.80 and MS = 276.38 ± 110.05. The implants were shown to be different in terms of the variables of maximum force (F = 4.401, p = 0.0120), elasticity in maximum flexion (F = 3.672, p = 0.024), and relative stiffness (F = 4.60, p = 0.01). In this study, external hexagonal implants with acid surface treatment showed the highest values of pullout strength and better stability, which provide greater indication for their use.
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