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Search Results: 1 - 10 of 350705 matches for " Mirella F. C. Santos "
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Genetic Structure of Lutzomyia longipalpis Populations in Mato Grosso Do Sul, Brazil, Based on Microsatellite Markers
Mirella F. C. Santos, Paulo E. M. Ribolla, Diego P. Alonso, José D. Andrade-Filho, Aline E. Casaril, Alda M. T. Ferreira, Carlos E. S. Fernandes, Reginaldo P. Brazil, Alessandra G. Oliveira
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074268
Abstract: Background Lutzomyia longipalpis (Diptera: Psychodidae) is the major vector of Leishmania (Leishmania) infantum and thus plays a crucial role in the epidemiology of American visceral leishmaniasis (AVL). This vector is the best studied species of sand fly in the Neotropical region. Many studies claim that this vector is in fact a species complex; however there is still no consensus regarding the number of species that belong into this complex or the geographical distribution of sibling species. The aim of the present study was to analyze the genetic relationships within?Lu. longipalpis?populations in the state of Mato Grosso do Sul (MS), Brazil. Methodology/Principal Findings We collected 30 Lu. longipalpis (15 females and 15 males) from five localities (Campo Grande, Três Lagoas, Aquidauana, Miranda and Bonito) and 30 Lu. Cruzi from Corumbá, totaling 180 sandflies from MS, and 30 Lu. longipalpis from Estrela de Alagoas, state of Alagoas (AL), Northeast Brazil. We show that eight previously described microsatellite loci were sufficient in distinguishing Lu. longipalpis from Lu. Cruzi, which is a closely related species, and in differentiating between Lu. longipalpis collected in MS versus Estrela de Alagoas. Analyses of the genotypes revealed introgression between sympatric Lu. longipalpis and Lu. Cruzi. Conclusions/Significance Our findings support the hypothesis of cryptic species within the Lu. longipalpis complex. Furthermore, our data revealed introgression between Lu. longipalpis and Lu. cruzi. This phenomenon should be further investigated to determine the level and incidence of hybridization between these two species. We also demonstrated that microsatellite markers are a powerful tool for differentiating sand fly populations and species. The present study has elucidated the population structure of Lu. longipalpis in MS and, by extension, the Neotropical Lu. longipalpis complex itself.
Color vision loss in patients treated with chloroquine
Ventura, Dora F.;Silveira, Luiz Carlos L.;Nishi, Mauro;Costa, Marcelo F.;Gualtieri, Mirella;Santos, Ruth M. A. dos;Pinto, Carolina T.;Moura, Ana Laura A. de;Rodrigues, Anderson R.;Sakurada, Claudio;Sauma, Maria de Fátima L. C.;Souza, John M. de;
Arquivos Brasileiros de Oftalmologia , 2003, DOI: 10.1590/S0004-27492003000600002
Abstract: patients that make use of chloroquine or hydroxychloroquine, drugs which are frequently administered for treatment of rheumatoid arthritis, lupus erithromatosus or malaria, may suffer alterations in color vision and in contrast sensitivity. the present work evaluates the visual function of these patients in a joint study of the university of s?o paulo (usp), in s?o paulo, and of the federal university of pará (ufpa), in belém. thirty two chloroquine user patients without alterations in the eye fundus exam were evaluated in s?o paulo (n=10; aged 38 to 71 years; mean=55,8 years) and in belém (n=22; aged 20 to 67; mean=40 years). the prescribed accumulated chloroquine dose was 45 to 430 g (mean=213 g; sd = 152 g) for the s?o paulo group, and 36 to 540 g (mean=174 g; sd=183 g) for the belém group. tests were performed monocularly with corrected eye refractive state. color discrimination was evaluated using the cambridge colour test (cct): the color discrimination threshold was measured first in the protan, deutan and tritan axes and, in succession, three macadam's ellipses were determined. the patient's color vision was also evaluated with color arrangement tests: the farnsworth-munsell 100 hue (fm100), the farnsworth-munsell d15, and the lanthony desaturated (d15d) tests. we also measured the contrast sensitivity for black-and-white sine wave grating of twenty two patients. the results were compared with controls without ophthalmologic or neuro-ophthalmologic pathologies. twenty four patients presented acquired dyschromatopsia. there were cases of selective loss (11 patients) and of diffuse loss (13 patients). although losses were present in the fm100 there was no correlation between the fm100 error score and the ellipse area measured by the cct. moreover, three patients that scored normal in the fm100, failed to reach normal threshold in the cct. the lanthony test was less sensitive than the other two tests, since it failed to indicate loss in about half the patients,
Antimicrobial activity and potential use of monoterpenes as tropical fruits preservatives
Garcia, Roxana;Alves, Eliomara S.S.;Santos, Mirella P.;Aquije, Glória M.F. Viégas;Fernandes, A. Alberto R.;Santos, Reginaldo B. dos;Ventura, Jose A.;Fernandes, Patricia M.B.;
Brazilian Journal of Microbiology , 2008, DOI: 10.1590/S1517-83822008000100032
Abstract: banana, papaya and pineapple are the most consumed tropical fruits in the world, being brazil one of the main producers. fungi colletotrichum musae, colletotrichum gloeosporioides and fusarium subglutinans f.sp. ananas cause severe post harvest diseases and losses in fruits quality. the aim of this work was to evaluate the effectiveness of five monoterpenes to inhibit the mycelial growth and conidia germination of these three phytopathogens. the monoterpenes citral, citronellal, l-carvone, isopullegol and a-pinene were diluted in ethanol to final concentrations from 0.2 to 1%. all monoterpenes were found to inhibit the growth of the three studies fungi in a dose-dependent manner. citral was the most effective of the oils tested and showed potent fungicidal activity at concentrations above 0.5%. also, in vivo evaluation with these tropical fruits demonstrated the efficiency of citral to inhibit fungal growth. these results indicate the potential use of citral as a natural pesticide control of post-harvest fruit diseases.
The electrostatic field of a point charge and an electrical dipole in the presence of a conducting sphere
F C Santos,A C Tort
Physics , 2004, DOI: 10.1088/0143-0807/25/6/018
Abstract: We evaluate the electrostatic potential and the electrostatic field created by a point charge and an arbitrarly oriented electrical dipole placed near a grounded perfectly conducting sphere. Induced surface charge distributions as well as electrostatic energy, force and torque associated with this configuartion are fully discussed. Possible variants of the problem are also discussed.
Confined Maxwell Field and Temperature Inversion Symmetry
A. C. Tort,F. C. Santos
Physics , 2000, DOI: 10.1016/S0370-2693(00)00498-6
Abstract: We evaluate the Casimir vacuum energy at finite temperature associated with the Maxwell field confined by a perfectly conducting rectangular cavity and show that an extended version of the temperature inversion symmetry is present in this system.
The Casimir energy of a massive fermion field revisited
F. C. Santos,A. C. Tort
Physics , 2002,
Abstract: We introduce a general, simple and effective method of evaluating the zero point energy of a quantum field under the influence of arbitrary boundary conditions imposed on the field on flat surfaces perpendicular to a chosen spatial direction. As an example we apply the method to the Casimir effect associated with a massive fermion field on which MIT bag model type of boundary conditions are imposed.
Duality Transformations and temperature inversion symmetry
F C Santos,A C Tort
Physics , 2001,
Abstract: We argue that the temperature inversion symmetry present in the original Casimir setup and also in other Casimir systems for which symmetrical boundary conditions are imposed is not related to the duality transformations that in the context defined in Ref. [1] are transformations relating spatial extension and temperature, and pressure and energy density. We provide an example of a Casimir system for which in principle there is no temperature inversion symmetry but nevertheless these duality transformations can be found.
Structure and property relationships of amorphous CNx: a joint experimental and theoretical study
Santos, M.C. dos;Alvarez, F.;
Brazilian Journal of Physics , 2000, DOI: 10.1590/S0103-97332000000300005
Abstract: amorphous cnx and cnx:h have been prepared by the ion beam assisted deposition technique. samples were characterized through x-ray and uv photoemission, ir absorption and raman spectroscopies. these spectra have been interpreted with the aid of quantum chemical calculations based upon the hartree-fock theory on several molecular models. the understanding of the electronic and structural properties of the amorphous alloy as a function of nitrogen content could help in the task of synthesizing the metastable silicon-nitride like-phase b-c3n4 , a solid which has been predicted to be as hard as diamond. the physical picture emerging from the present study helps to clarify the difficulties in obtaining the crystalline phase of the material, suggesting new experimental directions for syntheses.
The first steps in vision in the classroom
Santos, A.C.F;
Revista Brasileira de Ensino de Física , 2010, DOI: 10.1590/S1806-11172010000200003
Abstract: we examine, using the particle-in-the-box model, the transient absorption measurements of the cis-trans isomerization by the visual pigment rhodopsin present in the retina [r.w. schoenlein et al., science 254, 412 (1991)], which contains the retinene group, a conjugated system, which is formed by single and double carbon-carbon atoms, and works as a light antenna in the process of photon absorption. the present approach is directly applicable to the classroom in undergraduate chemistry and physics major courses.
A note on spherical f--tilings by right triangles
C. P. Avelino and A. F. Santos
Abstract: In this paper we present some spherical f-tilings by two (distinct) right triangles. We classify the group of symmetries of the presented tilings and the transitivity classes of isohedrality are also determined.
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