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Search Results: 1 - 10 of 502730 matches for " Carlos A. Luna "
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Primer registro de un ejemplar juvenil de Glyptodon sp. (Cingulata, Glyptodontidae) del Cuaternario de la provincia de Córdoba, Argentina
Luna,Carlos A.; Krapovickas,Jerónimo M.;
Mastozoolog?-a neotropical , 2011,
Abstract: the first record of a juvenile specimen of glyptodon sp. (cingulata, glyptodontidae) from the quaternary of córdoba province, argentina, is reported. the material consists of 90 osteoderms of the dorsal carapace, 19 osteoderms of the caudal armor and some post-cranial bones. this specimen principally presents hexagon shape osteoderms, with high thickness/maximum diameter ratio, circular or subcircular central figure, elevated in relation with the peripheric surface, with central depression, large piliferous perforations, poorly defined or completely absent peripheric figures and with a concave internal surface.
Presencia de Trachemys Agassiz, 1857 (Testudines, Emydidae) en el Pleistoceno tardío del centro de la Argentina
Cabrera,Mario R.; Luna,Carlos A.;
Cuadernos de herpetolog?-a , 2011,
Abstract: the first fossil record at central argentina of both the turtle genus trachemys agassiz, 1857 and the family emydidae rafinesque, 1815 is described. the fossil material, of late pleistocene - early holocene age, is composed of the proneural plate, the right pleurals iv and viii, and fragments of the left pleurals iii and iv, parts of the right epiplastron, hyoplastron and hypoplastron, and three indeterminate fragments. these shell elements were discovered at el silencio site (30°53'20" s, 62°49'29" w), southern coast of the saline mar chiquita lake, córdoba province, argentina, in a siltite level with calcium carbonate intercalations assigned to the tezanos pinto formation, whose deposition occurred between 36000 and 8000 years bp. the fossil record is related to a humid event between 16500 and 15500 years bp that, if marked and temporarily sustained enough, may have favoured the colonization by trachemys (as well as other vertebrate taxa) during the pleistocene into this area where the genus do not live today, 220 km far to the west of its present distribution.
Primer registro de un ejemplar juvenil de Glyptodon sp. (Cingulata, Glyptodontidae) del Cuaternario de la provincia de Córdoba, Argentina
Carlos A. Luna,Jerónimo M. Krapovickas
Mastozoolog?-a neotropical , 2011,
Abstract: Se da a conocer el primer registro de un ejemplar juvenil de Glyptodon sp. del Cuaternario de Córdoba. Se trata de 90 osteodermos del escudo dorsal, 19 de los anillos caudales y restos postcraneales que comprenden diáfisis del fémur y tibia, porciones de ilion izquierdo e isquion derecho, y una vértebra, con bajo grado de osificación. El ejemplar presenta principalmente osteodermos hexagonales, con relación espesor/diámetro máximo alta, figura central circular o subcircular elevada con respecto a la superficie periférica, depresión en el centro, notables perforaciones pilíferas, figuras periféricas pobremente definidas o completamente ausentes y superficie interna cóncava.
Presencia de Trachemys Agassiz, 1857 (Testudines, Emydidae) en el Pleistoceno tardío del centro de la Argentina
Cabrera, Mario R.,Luna, Carlos A.
Cuadernos de Herpetología , 2011,
Abstract: En este trabajo se describen restos del caparazón de una tortuga que constituyen el primer registro del género dulceacuícola Trachemys Agassiz, 1857 y de la familia Emydidae Rafinesque, 1815 en la provincia de Córdoba, y el hallazgo más occidental de ambos en la Argentina. Los materiales recuperados consisten en la placa proneural, las placas pleurales IV y VIII derechas y fragmentos de las placas pleurales III y IV izquierdas, epiplastron, hioplastron e hipoplastron derechos, más tres fragmentos indeterminables. Los restos provienendel Sitio El Silencio (30°53’20" S, 62°49’29" W), un yacimiento paleontológico de edad Pleistoceno tardío - Holoceno temprano, expuesto en la costa de la actual laguna Mar Chiquita, en un nivel de limo con intercalaciones de carbonato de calcio asignado a la Formación Tezanos Pinto, cuya depositación se produjo entre los 36.000 y 8.000 AP. El registro esrelacionado con un evento húmedo acontecido entre los 16.500 y 15.500 a os AP, que pudo haber sido lo suficientemente marcado y sostenido como para posibilitar el ingreso deTrachemys (y otros taxones vertebrados) durante el Pleistoceno a cercanías de la laguna Mar Chiquita, unos 220 km hacia el oeste de su distribución actual.
Range extension of Caligus chelifer (Copepoda: Siphonostomatoida) to coastal lagoons
Alberto Oca?a-Luna,Carlos álvarez-Silva
Revista de Biología Tropical , 2001,
Abstract:
Diabetes and Periodontal Diseases: An Established Two-Way Relationship  [PDF]
Carlos Arana Molina, Luna Florencio Ojeda, María Sevillano Jiménez, Cristóbal Morales Portillo, Isabel Serrano Olmedo, Tomás Martín Hernández, Gerardo Gómez Moreno
Journal of Diabetes Mellitus (JDM) , 2016, DOI: 10.4236/jdm.2016.64024
Abstract: Background: Periodontal diseases (PD), including periodontitis, are chronic inflammatory pathologies caused by bacteria in the subgingival biofilm which affect the periodontal tissues. PD is now considered a localized, chronic, oral infection that activates the host immuno-inflammatory responses both locally and systemically, and also constitutes a source of bacteraemia. It is a known fact that periodontal diseases exercise an important influence on the pathogenesis of numerous systemic diseases, including diabetes mellitus (DM). In the mid-nineties, sufficient scientific evidence emerged to confirm an association between DM and periodontitis, which then began to be regarded as the sixth complication of DM. Current scientific evidence points to a two-way relationship between DM and periodontal disease, whereby DM is associated with an increase in the incidence and progression of periodontitis, while periodontal infection is associated with worsening glycemic control in diabetic patients. This two-way relationship points to a need to promote oral health in DM patients, and to implement a joint management protocol between endocrinologist and dentist that aims to create adequate conditions for early diagnosis and the effective treatment of both diseases.
Uso de glucosa como agente reductor en la determinación semicuantitativa de paraquat en orina
José Rafael Luna,María Luisa Di Bernardo,María Ysabel García,Carlos Ya?ez
RETEL : Revista de Toxicología en Línea , 2007,
Abstract: Paraquat belongs to the Bipyridylium family of herbicides. It is widely used for green weed control since interferes with the mechanism of photosynthesis. The absorption by the intact skin and the respiratory tract is lower than ingestion. Paraquat is highly toxic via ingestion. Precisely, oral administration with either suicidal intent or accidentally is by far the commonest route of entry. The acute toxicological effects depend on the amount ingested. The absorbed paraquat is distributed via the bloodstream to practically all organs and tissues of the body, but it is excreted rapidly by the kidney. In some cases, before prescribing a treatment for people poisoned by paraquat, a spot test may be needed in order to confirm its diagnosis. Survival depends on the accuracy and timeliness of the diagnosis. There is a known spot test for paraquat in the urine which is available on hospitals and emergency centers. This qualitative test is based on the reduction of paraquat to a blue complex in the presence of alkali and sodium dithionite. The main disadvantage of this test is the instability of the blue radical ion in presence of oxygen. In the present research the aforementioned urine color test was reproduced but substituting sodium dithionite by glucose. Glucose was used as reducing agent in order to develop a semi-quantitative method with competitive advantages over the official method. Glucose is cheap, stable and nontoxic. Paraquat reacts with glucose in alkaline medium to yield a blue chromogen with higher stability than that one obtained using sodium dithionite. The colored complex is formed after incubation in water bath. Results showed that the colored complex is stable up to 12 hours and is paraquat-glucose concentration dependent. The proposed qualitative method could be used as a rapid and routinely color test for paraquat in urine samples for a quick confirmation of paraquat poisoning.
GPCA vs. PCA in Recognition and 3-D Localization of Ultrasound Reflectors
Carlos A. Luna,José A. Jiménez,Daniel Pizarro,Cristina Losada,José M. Rodriguez
Sensors , 2010, DOI: 10.3390/s100504825
Abstract: In this paper, a new method of classification and localization of reflectors, using the time-of-flight (TOF) data obtained from ultrasonic transducers, is presented. The method of classification and localization is based on Generalized Principal Component Analysis (GPCA) applied to the TOF values obtained from a sensor that contains four ultrasound emitters and 16 receivers. Since PCA works with vectorized representations of TOF, it does not take into account the spatial locality of receivers. The GPCA works with two-dimensional representations of TOF, taking into account information on the spatial position of the receivers. This report includes a detailed description of the method of classification and localization and the results of achieved tests with three types of reflectors in 3-D environments: planes, edges, and corners. The results in terms of processing time, classification and localization were very satisfactory for the reflectors located in the range of 50–350 cm.
An evaluation of copper biosorption by a brown seaweed under optimized conditions
Antunes,Wallace M.; Luna,Aderval S; Henriques,Cristiane A; da Costa,Antonio Carlos A;
Electronic Journal of Biotechnology , 2003,
Abstract: a basic investigation into the removal of copper ions from aqueous solutions by sargassum sp. was conducted in batch conditions. the influence of different experimental parameters such as initial ph, shaking rate, sorption time, temperature, equilibrium conditions and initial concentrations of copper ions on copper uptake was evaluated. results indicated that for shaking rates higher than 100 rpm no significant changes in copper accumulation were observed, as well as for ph values between 3.0 and 5.0. no marked effect on the biosorption of copper was detected for temperatures between 298 and 328k. the langmuir model better represented the sorption process, in comparison to the model of freundlich. the process followed a second-order kinetics and its calculated activation energy was 5.2 kcal/mol. due to its outstanding copper uptake capacity (1.48 mmol/g biomass) sargassum sp. proved to be an excellent biomaterial for accumulating and recovering copper from industrial solutions.
Sensor Calibration Based on Incoherent Optical Fiber Bundles (IOFB) Used For Remote Image Transmission
José L. Lázaro,Pedro R. Fernández,Alfredo Gardel,Angel E. Cano,Carlos A. Luna
Sensors , 2009, DOI: 10.3390/s91008215
Abstract: Image transmission using incoherent optical fiber bundles (IOFB) requires prior calibration to obtain the spatial in-out fiber correspondence in order to reconstruct the image captured by the pseudo-sensor. This information is recorded in a Look-Up Table (LUT), used later for reordering the fiber positions and reconstructing the original image. This paper presents a method based on line-scan to obtain the in-out correspondence. The results demonstrate that this technique yields a remarkable reduction in processing time and increased image quality by introducing a fiber detection algorithm, an intensity compensation process and finally, a single interpolation algorithm.
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