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Search Results: 1 - 10 of 589680 matches for " Paz María;Solorio-Cibrián "
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Influence of temperature and humidity on the biology of Triatoma mexicana (Hemiptera: Reduviidae: Triatominae) under laboratory conditions
Martínez-Ibarra, José Alejandro;Salazar-Schettino, Paz María;Solorio-Cibrián, Miriam;Cabrera Bravo, Margarita;Novelo-López, Mónica;Vences, Mauro Omar;Montes-Ochoa, Jazmín Yesenia;Nogueda-Torres, Benjamín;
Memórias do Instituto Oswaldo Cruz , 2008, DOI: 10.1590/S0074-02762008000700015
Abstract: several biological parameters related to the triatoma mexicana life-cycle were evaluated in this study. three cohorts were maintained under different combinations of temperature and relative humidity (rh): 25oc/50% rh; 25oc/75% rh; and 30oc/75% rh. observed hatching rates varied from 49-57.5% whereas the average time of hatching varied from 19.5-22.7 days. in the three cohorts studied, the mean time-lapse between presentation of the blood meal and the beginning of feeding was less than 5 min in all instars; the mean feeding time was longer than 10 min in all the instars; the post-feed defecation delay was over 10 min in all the instars. less than 50% of nymphs in each cohort completed the cycle and the average time from 1st instar nymph to adult was more than 255 days for the three cohorts. the number of blood meals before molt at each nymphal instar varied from 1-9. our results appear to indicate a lack of influence of temperature and rh on the biological parameters of t. mexicana that were studied, which could reflect the adaptation capacity of this species. we also conclude that t. mexicana can not be considered an effective transmitter of trypanosoma cruzi to human populations in areas where this species is currently present.
Biology of three species of North American Triatominae (Hemiptera: Reduviidae: Triatominae) fed on rabbits
Martínez-Ibarra, José Alejandro;Alejandre-Aguilar, Ricardo;Paredes-González, Edgar;Martínez-Silva, Miguel Alejandro;Solorio-Cibrián, Miriam;Nogueda-Torres, Benjamín;Trujillo-Contreras, Francisco;Novelo-López, Mónica;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007000800006
Abstract: aspects related to hatching, lifetime, number of blood meals for molting, mortality, feeding time, and postfeeding defecation delay were evaluated and compared in each instar of three north american triatominae: triatoma gerstaeckeri, triatoma lecticularia and triatoma protracta, all of them fed on rabbits. no significant differences (p > 0.05) were found among the three species regarding mean hatching rate, which was close to 20 days. egg-to-adult development times were significantly shorter (p < 0.05) for t. lecticularia. number of blood meals for molting to next instar ranged from one to five for t. protracta, and from one to six for t. gerstaeckeri and t. lecticularia. mortality rates were higher in younger nymphs of t. lecticularia and t. protracta, while rates in t. gerstaeckeri were higher in fifth-instar nymphs. mean feeding time was longest in t. gerstaeckeri, followed by t. lecticularia. more than twice the number of t. gerstaeckeri nymphs completed the development process, if compared to the nymphs from the other two species. defecation delay was less than 10 min for t. lecticularia, t. protracta and the youngest nymphs of t. gerstaeckeri. results point out that these three species may be important potential vectors of trypanosoma cruzi for human populations, in areas of mexico where these species are currently present.
Finite One-Dimensional Photonic Crystal with Gaussian Modulation: Transmission and Escape  [PDF]
María de la Luz Silba-Vélez, David-Armando Contreras-Solorio, Rolando Pérez-álvarez, Carlos Iván Cabrera
Optics and Photonics Journal (OPJ) , 2017, DOI: 10.4236/opj.2017.710017
Abstract: This paper studied the transmission coefficient and escape frequencies in a system of planar dielectric layers where the refractive index changes from one layer to another through a Gaussian function. The wave equation with normal incidence is analyzed. For the calculations, the transfer matrix formalism is used. In a previous work, the transmission and escape problem for Gaussian electronic superlattices is investigated. Now it studied the electromagnetic modes for a system formed by layers where the refractive index of the structure is modulated by a Gaussian function. The system presents transparency bands of transmission and gaps without transmission. The escape frequencies \"\" are situated near these transparency bands but they do not coincide with them. is the frequency (mode) and Γ describes the width of the states. For these systems, the escape states are very wide. A non Gaussian system presents resonance peaks in the transmission and the escape states are narrow. The formation of transparency bands in the transmission for a Gaussian system is attributed to the widening of the escape states.
Un tiempo para meditar
María Paz León Bratti
Acta Médica Costarricense , 2000,
Abstract:
Infección por VIH y el 2006, un doble aniversario
María Paz León Bratti
Acta Médica Costarricense , 2006,
Abstract:
Premio Dr. Rodolfo Céspedes Fonseca 2003
María Paz León-Bratti
Acta Médica Costarricense , 2004,
Abstract:
Guía breve para el manejo de las infecciones oportunistas del paciente adulto y adolescente con VIH/sida
María Paz León-Bratti
Acta Médica Costarricense , 2011,
Abstract:
Abstract
María Paz León Bratti
Acta Médica Costarricense , 2003,
Abstract:
Evolución de las características de las arcadas dentarias en dos grupos de edad
Paulino,Vera Susana; Paredes-Gallardo,Vanessa; Gandía-Franco,José Luis; Cibrián-Ortiz de Anda,Rosa María;
RCOE , 2005, DOI: 10.4321/S1138-123X2005000100004
Abstract: introduction: dimensional characteristics of dental arches between two groups of age, adolescents and adults, are compared to analyze the variations associated with age, sex and influence of orthodontic treatment. material and methods: two samples of 88 pairs of stone models from adolescents (average age, 14.05 years) and 65 from adults (average age, 22.15 years) were selected. after cast scanning, a digital program was used to measure dental mesiodistal diameters, intercanine and intermolar widths, arch lengths and lower dental crowding. for the statistic analysis the samples of each age group were divided by sex and by the fact of having been treated or not with orthodontics. results: the values of the mesiodistal diameters in males were greater than in females, and greater in adolescents than in adults, especially in females. the intercanine distance decreased with age in females and the maxillary intermolar distance decreased in untreated females, while the mandibular one increased in males. both arch lengths decreased in both sexes, mainly in the untreated individuals. there is an increase of the anteroinferior dental crowding with age in both sexes in the treated group. conclusions: the loss of dental material with age associated to a greater decrease of arch length could be another factor in the later crowding. also the mesial displacement of the teeth to a narrower part of the arch could explain the decrease in the intercanine and intermolar widths.
New Insights into the Roles of Megalin/LRP2 and the Regulation of its Functional Expression
Marzolo,María-Paz; Farfán,Pamela;
Biological Research , 2011, DOI: 10.4067/S0716-97602011000100012
Abstract: since the discovery of the low-density lipoprotein receptor (ldlr) and its association with familial hypercholesterolemia in the early 1980s, a family of structurally related proteins has been discovered that has apolipoprotein e as a common ligand, and the broad functions of its members have been described. lrp2, or megalin, is a member of the ldlr family and was initially called gp330. megalin is an endocytic receptor expressed on the apical surface of several epithelial cells that internalizes a variety of ligands including nutrients, hormones and their carrier proteins, signaling molecules, morphogens, and extracellular matrix proteins. once internalized, these ligands are directed to the lysosomal degradation pathway or transported by transcytosis from one side of the cell to the opposite membrane. the availability of megalin at the cell surface is controlled by several regulatory mechanisms, including the phosphorylation of its cytoplasmic domain by gsk3, the proteolysis of the extracellular domain at the cell surface (shedding), the subsequent intramembrane proteolysis of the transmembrane domain by the gamma-secretase complex, and exosome secretion. based on the important roles of its ligands and its tissue expression pattern, megalin has been recognized as an important component of many pathological conditions, including diabetic nephropathy, lowe syndrome, dent disease, alzheimer's disease (ad) and gallstone disease. in addition, the expression of megalin and some of its ligands in the central and peripheral nervous system suggests a role for this receptor in neural regeneration processes. despite its obvious importance, the regulation of megalin expression is poorly understood. in this review, we describe the functions of megalin and its association with certain pathological conditions as well as the current understanding of the mechanisms that underlie the control of megalin expression.
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