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Search Results: 1 - 10 of 829257 matches for " A. C. L. de;ROJAS "
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Leishmania (Viannia) panamensis - induced cutaneous leishmaniasis in susceptible and resistant mouse strains
Goto, H.;Rojas, J. I.;Sporrong, L.;Carreira, P. de;Sánchez, C.;?rn, A.;
Revista do Instituto de Medicina Tropical de S?o Paulo , 1995, DOI: 10.1590/S0036-46651995000600001
Abstract: we studied the susceptibility to leishmania (viannia) panamensis in strains of mice. the c57bl/6 strain was resistant and showed self-controlled lesion at the injected foot pad. the balb/c and dba/2j strains were susceptible and showed a foot swelling that started day 20 post-infection and progressed to a tumour-like lesion in later period of observation. the cba/hj strain was found to be of intermediary resistance. in contrast to other known cutaneous leishmaniasis in mice, the lesion in l. (v.) panamensis-infected mice was restricted to the inoculation site in the skin. in addition, we studied the development of cellular response and antibodies against leishmania antigen in balb/c and c57bl/6 strains. the proliferative response of lymph node cells against l. (v.) panamensis antigen was biphasic in both strains. an initial response was seen on day 20, followed by a refractory period between 40 and 80 days and a second response around fourth month post-infection. the response in the latter period was higher in c57bl/6 strain than in balb/c strain. balb/c strain presented much higher anti-leishmania antibody level than c57bl/6 strain. the model and the correlation of immunological variables and the course of the infection are discussed.
Preliminary assessment of heavy metal levels in Mytella falcata (Bivalvia, Mytilidae) from Bacanga River estuary, S?o Luis, State of Maranh?o, Northeastern Brazil
Revista Brasileira de Biologia , 2000, DOI: 10.1590/S0034-71082000000100003
Abstract: the concentrations of cu, zn, pb, and cd were determined in the mussel mytella falcata from the bacanga river estuary, in order to evaluate the potential role of domestic effluents released "in natura" on the quality of the estuarine environment with consequences to shellfish resources. cu concentrations ranged from 5.2 mg.g-1 to 13.1 mg.g-1, while zn concentrations ranged from 49.1 mg.g-1 to 76.3 mg.g-1. pb and cd showed concentrations lower than 2 mg.g-1. the results showed low concentrations of cu, pb and cd in the filter-feeding mytella falcata in the study area in comparison with the maximum values stablished to foods by the brazilian government (decree law no 55,871). finally, zn presented slightly higher values than the maximum ones stablished by the brazilian government.
Preliminary assessment of heavy metal levels in Mytella falcata (Bivalvia, Mytilidae) from Bacanga River estuary, S o Luis, State of Maranh o, Northeastern Brazil
Revista Brasileira de Biologia , 2000,
Abstract: The concentrations of Cu, Zn, Pb, and Cd were determined in the mussel Mytella falcata from the Bacanga River estuary, in order to evaluate the potential role of domestic effluents released "in natura" on the quality of the estuarine environment with consequences to shellfish resources. Cu concentrations ranged from 5.2 mg.g-1 to 13.1 mg.g-1, while Zn concentrations ranged from 49.1 mg.g-1 to 76.3 mg.g-1. Pb and Cd showed concentrations lower than 2 mg.g-1. The results showed low concentrations of Cu, Pb and Cd in the filter-feeding Mytella falcata in the study area in comparison with the maximum values stablished to foods by the Brazilian Government (Decree Law No 55,871). Finally, Zn presented slightly higher values than the maximum ones stablished by the Brazilian government.
Crystal Structure and Physical Properties of U3T3Sn4 (T = Ni, Cu) Single-Crystals
L. Shlyk,P. Estrela,J. C. Waerenborgh,L. E. De Long,A. de Visser,D. P. Rojas,F. Gandra,M. Almeida
Physics , 2000, DOI: 10.1016/S0921-4526(00)00460-9
Abstract: Heat capacity experiments, crystal structure determination and transmission electron microscopy have been carried out on U3Cu3Sn4 single-crystals. U3Cu3Sn4 was confirmed to be a heavy-fermion antiferromagnet (TN=13(1) K) with a low temperature electronic heat capacity coefficient gamma=390 mJ/molUK2. Low temperature heat capacity experiments on a U3Ni3Sn4 single-crystal indicate that below 0.4 K there is a crossover between the previously observed non-Fermi liquid behavior and a Fermi liquid state.
Técnica laparoscópica reversa en el manejo quirúrgico de la endometriosis profunda del tabique rectovaginal: experiencia preliminar
Prado A,Jaime; Larraín de la C,Demetrio; González L,Felipe; Marengo,Francesca; Prado C,Tomás; Rabischong,Benoit; Rojas T,Iván;
Revista chilena de obstetricia y ginecología , 2012, DOI: 10.4067/S0717-75262012000100006
Abstract: background: surgical resection of deep infiltrating endometriosis (die) is complex and it is associated with a high risk of complications. recently, the so-called reverse technique seems to be associated with lower a complication rate when compared to standard technique. aims: to report our preliminary experience and the feasibility of reverse technique in the management of die. method: report of 5 cases from a prospective database. results: mean age was 34.2 years (range: 32-37 years). all patients had chronic pelvic pain and severe dyspareunia and 3 women had previous surgeries for endometriosis. mean operative time was 313 minutes (range: 180-450 minutes). all surgeries were completed by laparoscopy and no complications were noted. histological analysis confirmed endometriosis in all cases. mean follow-up was 4 months (range: 2-8 month). conclusion: reverse laparoscopic technique is feasible and reproductible, however, it should be reserved to teams experienced in advanced laparoscopic surgery.
Pathogenicity island cag, vacA and IS605 genotypes in Mexican strains of Helicobacter pylori associated with peptic ulcers
Fernando Antonio-Rincón, Yolanda López-Vidal, Gonzalo Castillo-Rojas, Eduardo C Lazcano-Ponce, Sergio Ponce-de-León, María L Tabche-Barrera, Germán R Aguilar-Gutiérrez
Annals of Clinical Microbiology and Antimicrobials , 2011, DOI: 10.1186/1476-0711-10-18
Abstract: The cag PAI integrity was performed by detection of eleven targeted genes along this locus using dot blot hybridization and PCR assays. The vacA allelic, cag PAI genotype 1 and IS605 status were determined by PCR analysis.Groups of 16-17 isolates (n = 50) from two patients with NPU, NBPU, and BPU, respectively, were studied. 90% (45/50) of the isolates harbored a complete cag PAI. Three BPU isolates lacked the cag PAI, and two of the NBPU had an incomplete cag PAI: the first isolate was negative for three of its genes, including deletion of the cagA gene, whereas the second did not have the cagM gene. Most of the strains (76%) had the vacA s1b/m1 genotype; meanwhile the IS605 was not present within the cag PAI of any strain but was detected elsewhere in the genome of 8% (4/50).The patients had highly virulent strains since the most of them possessed a complete cag PAI and had a vacA s1b/m1 genotype. All the isolates presented the cag PAI without any IS605 insertion (genotype 1). Combined vacA genotypes showed that 1 NPU, 2 NBPU, and 1 BPU patients (66.6%) had a mixed infection; coexistence of H. pylori strains with different cag PAI status was observed in 1 NBPU and 2 BPU (50%) of the patients, but only two of these patients (NBPU and BPU) had different vacA genotypes.H. pylori is a well-recognized pathogen that chronically infects the stomach of up to 50% of the world's human population. The prevalence of H. pylori is high in developing countries; in Mexico its seroprevalence is 66% of the general population and is common in asymptomatic population [1-5].There are two genotypic characteristics of virulent H. pylori strains: the vacA gene, and the cag PAI region. Virtually all H. pylori strains have a copy of vacA, but the structure among alleles varies in three regions: the signal (s) region that is present as type s1 (subtype a, b and c) or type s2, the intermediate (i) region that exists in subtype 1 and 2, and the middle (m) region that exists in three different
The Gaia-ESO Survey: Separating disk chemical substructures with cluster models
A. Rojas-Arriagada,A. Recio-Blanco,P. de Laverny,M. Schultheis,G. Guiglion,?. Mikolaitis,G. Kordopatis,V. Hill,G. Gilmore,S. Randich,E. J. Alfaro,T. Bensby,S. E. Koposov,M. T. Costado,E. Franciosini,A. Hourihane,P. Jofré,C. Lardo,J. Lewis,K. Lind,L. Magrini,L. Monaco,L. Morbidelli,G. G. Sacco,C. C. Worley,S. Zaggia,C. Chiappini
Physics , 2015,
Abstract: (Abridged) Recent spectroscopic surveys have begun to explore the Galactic disk system outside the solar neighborhood on the basis of large data samples. In this way, they provide valuable information for testing spatial and temporal variations of disk structure kinematics and chemical evolution. We used a Gaussian mixture model algorithm, as a rigurous mathematical approach, to separate in the [Mg/Fe] vs. [Fe/H] plane a clean disk star subsample from the Gaia-ESO survey internal data release 2. We find that the sample is separated into five groups associated with major Galactic components; the metal-rich end of the halo, the thick disk, and three subgroups for the thin disk sequence. This is confirmed with a sample of red clump stars from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. The two metal-intermediate and metal-rich groups of the thin disk decomposition ([Fe/H]>-0.25 dex) highlight a change in the slope at solar metallicity. This holds true at different radial regions. The distribution of Galactocentric radial distances of the metal-poor part of the thin disk ([Fe/H]<-0.25 dex) is shifted to larger distances than those of the more metal-rich parts. Moreover, the metal-poor part of the thin disk presents indications of a scale height intermediate between those of the thick and the rest of the thin disk, and it displays higher azimuthal velocities than the latter. These stars might have formed and evolved in parallel and/or dissociated from the inside-out formation taking place in the internal thin disk. Their enhancement levels might be due to their origin from gas pre-enriched by outflows from the thick disk or the inner halo. The smooth trends of their properties (their spatial distribution with respect to the plane, in particular) with [Fe/H] and [Mg/Fe] suggested by the data indicates a quiet dynamical evolution, with no relevant merger events.
The Gaia-ESO Survey: metallicity and kinematic trends in the Milky Way bulge
A. Rojas-Arriagada,A. Recio-Blanco,V. Hill,P. de Laverny,M. Schultheis,C. Babusiaux,M. Zoccali,D. Minniti,O. A. Gonzalez,S. Feltzing,G. Gilmore,S. Randich,A. Vallenari,E. J. Alfaro,T. Bensby,A. Bragaglia,E. Flaccomio,A. C. Lanzafame,E. Pancino,R. Smiljanic,M. Bergemann,M. T. Costado,F. Damiani,A. Hourihane,P. Jofré,C. Lardo,L. Magrini,E. Maiorca,L. Morbidelli,L. Sbordone,C. C. Worley,S. Zaggia,R. Wyse
Physics , 2014, DOI: 10.1051/0004-6361/201424121
Abstract: (Abridged) We analyzed the stellar parameters and radial velocities of ~1200 stars in five bulge fields as determined from the Gaia-ESO survey data (iDR1). We use VISTA Variables in The Via Lactea (VVV) photometry to obtain reddening values by using a semi-empirical T_eff-color calibration. From a Gaussian decomposition of the metallicity distribution functions, we unveil a clear bimodality in all fields, with the relative size of components depending of the specific position on the sky. In agreement with some previous studies, we find a mild gradient along the minor axis (-0.05 dex/deg between b=-6 and b=-10) that arises from the varying proportion of metal-rich and metal-poor components. The number of metal-rich stars fades in favor of the metal-poor stars with increasing b. The K-magnitude distribution of the metal-rich population splits into two peaks for two of the analyzed fields that intersects the near and far branches of the X-shaped bulge structure. In addition, two lateral fields at (l,b)=(7,-9) and (l,b)=(-10,-8) present contrasting characteristics. In the former, the metallicity distribution is dominated by metal-rich stars, while in the latter it presents a mix of a metal-poor population and and a metal-intermediate one, of nearly equal sizes. Finally, we find systematic differences in the velocity dispersion between the metal-rich and the metal-poor components of each field. Our chemo-kinematical analysis is consistent with a varying field-to-field proportion of stars belonging to (i) a metal-rich boxy/peanut X-shaped component, with bar-like kinematics, and (ii) a metal-poor more extended rotating structure with a higher velocity dispersion that dominates far from the Galactic plane. These first GES data allow studying the detailed spatial dependence of the Galactic bulge populations, thanks to the analysis of individual fields with relatively high statistics.
Linfoma de Hodkin en Chile: Experiencia de 15 a?os del Programa Nacional de Cáncer del Adulto
Cabrera C,M Elena; García L,Hernán; Lois V,Vivian; León R,Alvaro; Pe?a N,Karina; Rossle S,Alberto; Cerda A,Berta; Rojas R,Hernán; Meneses C,Pedro; Merino M,Carlos; Aspillaga M,Augusto; Vittini de R,Cecilia; Oliva L,Jacqueline; Hales D,Cecilia; Rosas H,Janet;
Revista médica de Chile , 2007, DOI: 10.4067/S0034-98872007000300009
Abstract: background: hodgkin lymphoma is a highly curable disease. aim: to evaluate the clinical characteristics and the treatment results of hodgkin lymphoma patients of the national cancer program in chile. patients and methods: prospective assessment of 682 patients treated in 18 adult cancer centers. progression free survival (pfs) and overall survival (os) were calculated. median follow up was 127, 95, 87, 72 and 50 months for c-mopp, radiotherapy (rt), c-mopp/abv, novp and abvd, respectively. results: median age was 37 years (15-84). nodular sclerosis and mixed cellularity were equally expressed. advanced stages (iii & iv) were present at diagnosis in 61% of cases. age over 40 was an adverse prognostic factor (p <0.001). the rate of pfs at 5 and 10 years for early stages was 73% and 66% with rt, 80% and 74% with c-mopp+rt, 73% and 71% with c-mopp/abv, 59% and 59% with novp+rt, and 81% with abvd+rt, at 5 years, being significantly lower for novp (p =0.02). the rate of os at 5 and 10 years for advanced stages was 82% and 70% with rt, 82% and 76% with c-mopp+rt, 82% and 80% with c-mopp/abv, 68% and 60% with novp, and 85% with abvd at 5 years, also significantly lower for novp (p =0.04). for advanced stages, the rate of pfs at 5 and 10 years was 49% and 43% with c-mopp, 69% and 62% with c-mopp/abvd or c-mopp/abv, and 71% at 5 years with abvd, significantly lower for c-mopp (p =0.01). the rate of os at 5 and 10 years was 52% and 46% with c-mopp, 70% and 63% with c-mopp/abvd or c-mopp/abv and 76% with abvd at 5 years, significantly lower for c-mopp (p =0.0002). conclusions: age over 40 years was an adverse prognostic factor. c-mopp/abvd, c-mopp/abv and abvd had comparable results and reached a high tumor control and overall survival in both early and advanced stages
María Fernanda Rojas C,álvaro Burdiles O,Oscar Contreras O,Raúl Rojas C
Revista Chilena de Radiología , 2010,
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