oscar hernandez reyes - Academia.edu (original) (raw)

Papers by oscar hernandez reyes

Ingeniería e Investigación

This paper presents an experimental investigation aimed at estimating the thermal efficiency of a... more This paper presents an experimental investigation aimed at estimating the thermal efficiency of a heat pipe compared to the most common elements for removing heat from a circuit (i.e., an electric fan and a fin - extended surface). The input voltage frequency for a standard power circuit was changed for the experiments, whilst all the other parameters were kept constant. An experimental statistical design was used as an analytical tool. Unexpectedly, the heat pipe showed the lowest thermal efficiency for all the experiments, although it had the advantage of being a passive element having low volume and no mobile parts.

Proceedings of the International Joint Conference on Computational Intelligence, 2009

EBioMedicine, 2018

Background: Type-2 diabetes mellitus (T2DM) is a major health problem with increasing incidence, ... more Background: Type-2 diabetes mellitus (T2DM) is a major health problem with increasing incidence, which severely impacts cardiovascular disease. Because T2DM is associated with altered gene expression and aberrant splicing, we hypothesized that dysregulations in splicing machinery could precede, contribute to, and predict T2DM development. Methods: A cohort of patients with cardiovascular disease (CORDIOPREV study) and without T2DM at baseline (at the inclusion of the study) was used (n = 215). We determined the expression of selected splicing machinery components in fasting and 4 h-postprandial peripheral blood mononuclear cells (PBMCs, obtained at baseline) from all the patients who developed T2DM during 5-years of follow-up (n = 107 incident-T2DM cases) and 108 randomly selected non-T2DM patients (controls). Serum from incident-T2DM and control patients was used to analyze in vitro the modulation of splicing machinery expression in control PBMCs from an independent cohort of healthy subjects. Findings: Expression of key splicing machinery components (e.g. RNU2, RNU4 or RNU12) from fasting and 4 h-postprandial PBMCs of incident-T2DM patients was markedly altered compared to non-T2DM controls. Moreover, in vitro treatment of healthy individuals PBMCs with serum from incident-T2DM patients (compared to non-T2DM controls) reduced the expression of splicing machinery elements found down-regulated in incident-T2DM patients PBMCs. Finally, fasting/postprandial levels of several splicing machinery components in the PBMCs of CORDIOPREV patients were associated to higher risk of T2DM (Odds Ratio N 4) and could accurately predict (AUC N 0.85) T2DM development. Interpretation: Our results reveal the existence of splicing machinery alterations that precede and predict T2DM development in patients with cardiovascular disease.

Journal of Bacteriology, 1995

We have reevaluated the gene assignments of the proline mutant alleles of some known Pro- Escheri... more We have reevaluated the gene assignments of the proline mutant alleles of some known Pro- Escherichia coli strains. Of nine proline auxotrophs included in the study, five presented phenotypes inconsistent with their previously assigned genotypes. We discuss the possible sources and the consequences of these assignment errors.

Journal of Bacteriology, 1995

Auxotrophic proA mutants of Escherichia coli were complemented by two different classes of Coryne... more Auxotrophic proA mutants of Escherichia coli were complemented by two different classes of Corynebacterium glutamicum genes. One of these was the asd gene. The E. coli asd gene also complements the same proA alleles. Complementation of proA by the asd+ gene requires a high asd dosage and the proB and the proC gene products. The reciprocal complementation pattern (asd by the proA+ gene) was not observed. This complementation appears to be due to multicopy suppression by a proline biosynthetic gene whose product was expected to play a negligible role in this pathway. The other class of complementing clones carries the C. glutamicum proA gene. Complementation of E. coli proA mutants by the C. glutamicum proA+ gene was optimal at high osmolarity.

Universidad Ciencia Y Tecnologia, Jun 1, 2006

Ingenieria E Investigacion, 2010

El presente artículo reporta los resultados de una investigación experimental relacionada con la ... more El presente artículo reporta los resultados de una investigación experimental relacionada con la determinación de la eficiencia térmica de un tubo para la transferencia de calor (TPTC o heat pipe) comparada con la de dos elementos comúnmente utilizados para disipar calor en un circuito, esto es, un ventilador y una aleta. En los ensayos se varió la frecuencia de la alimentación a un circuito de potencia estándar, manteniéndose constantes los demás parámetros. Se utilizó un diseño estadístico de experimentos como herramienta analítica. Para todos los experimentos el TPTC, inesperadamente, tuvo la menor eficiencia térmica, aunque tiene la ventaja de ser pasivo, poseer un pequeño volumen y carecer de partes móviles. Palabras clave: transferencia de calor, disipación de energía en un circuito, efecto Joule.

Memorias Del Xii Simposio Colombiano Sobre Ingenieria De Pavimentos, Jul 1, 1999

Se describe la realizacion de un estudio experimental en el laboratorio, para la determinacion de... more Se describe la realizacion de un estudio experimental en el laboratorio, para la determinacion de los porcentajes optimos de desperdicio de material plastico (llantas viejas, neumaticos usados, bolsas de leche y botellas de agua), mediante la ejecucion de los ensayos Marshall, modulo dinamico y leyes de fatiga. El material plastico es introducido en la mezcla asfaltica en el momento de mezclado del granular y el asfalto, en pedazos de aproximadamente 4 milimetros de lado. Los ensayos de modulo dinamico se realizaron a 10, 20 y 30 grados centigrados y a 1, 10 y 25 hercios de frecuencia; las leyes de fatiga se ejecutaron para tres deformaciones diferentes y a las temperaturas de 10 y 20 grados centigrados. Los resultados principales fueron los porcentajes optimos de cada material, el porcentaje de mejoramiento y la temperatura, la deformacion y la frecuencia empleada en la ejecucion de cada ensayo. Como conclusion general, se determino que existia un porcentaje de desperdicio plastico, dentro del rango especificado, que mejoraba las propiedades mecanicas de la estructura de pavimento, sin importar el ensayo, la frecuencia y la temperatura del mismo. En forma general concluye que las botellas de agua para un porcentaje de 0,4 por ciento y una temperatura de 10 y 20 grados centigrados representan los valores maximos; para 30 grados centigrados el desperdicio seran las llantas viejas a 0,1 por ciento. Ver ficha general ITRD S404191.

Investigacion Y Ciencia Universidad Autonoma De Aguascalientes, 2006

Universidad Ciencia Y Tecnologia, Jun 1, 2006

Ensayos Historia Y Teoria Del Arte, 1998

EscRITA en 1892 el preludio llevaba como título "Preludio, interludio y paráfrasis final para la ... more EscRITA en 1892 el preludio llevaba como título "Preludio, interludio y paráfrasis final para la siesta de un fauno". Con este título resulta imprescindible pensar que se trataba más bien de un acompañamiento para una presentación dramática de la obra de 'Mallarmé'; sin embargo, sólo subsistió su primera parte "Preludio". La intención primera, según su autor, era 'ilustrar' este poema, sin querer, de ninguna manera, una síntesis del poema. Son los decorados sucesivos a través de los cuales se mueven los deseos y los sueños del fauno en el calor de la hora de la siesta. Después, exhausto de perseguir la fuga temerosa de las ninfas y las náyades, se entrega al sueño embriagador, pletórico de ilusiones al fin realizadas, de posesión total en la naturaleza universal. En general, lo que Debussy quiere destacar en su alegoría del poema de Mallarmé es su "impresión", no transportando musicalmente el poema. En Mallarmé el fauno emerge de un sueño, no satisface sus deseos sino, precisamente, sumergiéndose en el sueño mismo. Es la incertidumbre del arte del poeta pues aquí es donde no sabemos si el fauno, en verdad, sueña o, está despierto, o quizás son sueños soñados despiertos. El poema refleja variedad de caracteres o fenómenos distintos intrínsecos al mismo. De un lado, existe una ninfa casta saturada de ilusiones, y del otro, una ninfa experimentada, aspirando al amor. También se escenifican dos faunos, el fauno apetente de los deleites carnales e incontrolables deseos, y, el fauno que entra en el conflicto con el deseo. Lo curioso es que ninguno de los dos ve sus objetivos satisfechos. La búsqueda de las ninfas por el fauno oscila entre la actividad y aquello que no se conmueve. El fauno está a punto de refugiarse en el sueño. En los siguientes versos Debussy se inspira para abrir su obra, en ese solo de flauta un 'solo largo' Quien disimulando en sí el desconcierto de la mejilla Sueña, en un solo largo, que nos entretenemos La belleza de alrededor por confusiones. Falsas entre ella misma y nuestro canto crédulo. Si bien el preludio tuvo aceptación del público no ocurrió lo mismo con la crítica musical especializada. Pero, en cambio, quienes estaban verdaderamente dentro del ámbito propiamente poético-musical recibieron con gran entusiasmo esta obra fundamental. El mismo Mallarmé exclamó, después de haber escuchado la interpretación de Debussy: "yo no esperaba algo parecido! Esta música prolonga la emoción de mi poema y sitúa el adorno más apasionadamente que el color", agregando que su ilustración de la siesta de

Revista Ingenierias Universidad De Medellin, Jul 1, 2009

This article describes the design and construction of a prototype system that senses objects pert... more This article describes the design and construction of a prototype system that senses objects perturbing a uniform electric field generated in a defined volume. To set up this system, an electric circuit capable of detecting any moving object even through a 0.15meter-thick brick wall was designed and built. Although the excellent electrodes sensibility to any object´s position change going into or out the field, it was found the need for a reference electrode. Tests were carried out in order to check the system´s movement sensibility. It was observed that the relative size and shape of the electrodes affects the detector's sensitivity for getting slow movements.

Gene Expression and its Regulation, 1973

The majority of the aminoacyl-tRNA synthetases recognize two or more tRNA species. The extraordin... more The majority of the aminoacyl-tRNA synthetases recognize two or more tRNA species. The extraordinary specificity of the various synthetases for their substrate tRNAs (for a recent review, see ref. 4) could be related to the base sequence of the tRNA, to its overall geometry, or to both features. It is of interest, therefore, to study changes in the tRNA sequence and the effect of such changes in biosynthetic systems.

Soundings, 2004

Two responses to some of the issues raised in our Soundings 26 discussion on the global and the l... more Two responses to some of the issues raised in our Soundings 26 discussion on the global and the local. 1 Oscar Reyes What does it mean to 'think the global locally?' At the most basic level, the contributors to this discussion converged on the view that the global and the local are constructed in relation to each other-which means that the forms that this relationship currently takes remain open to challenge. This is by no means as obvious as it might seem-a point that is well made by drawing a contrast with neo-liberal assumptions, which tend to depoliticise the global/ local relationship under the banner of 'globalisation'. Neo-liberals announce that the global is subject to a market logic that is beyond popular control, and that the local should merely equip us to face the challenges that it brings: There Is No Alternative (TINA). When globalisation operates in this way the results can be profoundly disempowering. We are asked to accept that there can be no significant 1. 'Thinking the global locally: roundtable discussion with Katharine Ainger, Jane Foot, Clare Joy and Doreen Massey', Soundings 26.

Química Nova, 2010

Recebido em 11/6/09; aceito em 11/9/09; publicado na web em 24/2/10 CHEMICAL STUDY AND ANTIFOULIN... more Recebido em 11/6/09; aceito em 11/9/09; publicado na web em 24/2/10 CHEMICAL STUDY AND ANTIFOULING ACTIVITY OF CARIBBEAN OCTOCORAL Eunicea laciniata. The bioassay guided purification of the octocoral Eunicea laciniata organic extract, collected at Santa Marta bay, Colombia, allowed the isolation of the new compound (-)-3β-pregna-5,20-dienyl-β-D-arabinopyranoside (1), along with the known compounds 1(S*),11(R*)-dolabell-3(E),7(E),12(18)-triene (2), 13-keto-1(S),11(R)-dolabell-3(E),7(E),12(18)-triene (3), cholest-5,22-dien-3β-ol (4), cholesterol (5), y brassicasterol (6). The structure and absolute configuration of 1 was determined on based spectroscopic analyses (NMR and CD). The extract showed antifouling activity against five strains of marine bacteria associated to heavy fouled surfaces. Also showed activity against the cypris of the cosmopolitan barnacle Balanus amphitrite, and low toxicity in Artemia salina test.

2014 XIX Symposium on Image, Signal Processing and Artificial Vision, 2014

ABSTRACT The Discrete Wavelet Transform (DWT) is an important technique for signal analysis, comp... more ABSTRACT The Discrete Wavelet Transform (DWT) is an important technique for signal analysis, compressing and denoising due to its excellent locality in the time-frequency domain. The DWT is developed by convolutions which demand both a large number of mathematical operations and a large amount of storage. The lifting scheme reduces both computational and storage requirements. We have developed a computational architecture for inverse DWT using the lifting scheme. The design was developed in VHDL and then implemented into a Virtex 5 FPGA. We aim to reach a high throughput and reduce the design area. The architecture takes 3L + N(1 − 0.5L) clock cycles to compute L levels of 1D reconstruction for a data of size N. Some comparisons suggest that our work could be faster than previous works.

This article presents the main characteristics of the design and con- struction of a prototype to... more This article presents the main characteristics of the design and con- struction of a prototype to measure heat flux, acquiring temperature variation and using noninvasive temperature sensors. The conditions of a post-surgical patient are related to energy consumption as a part of the metabolic answer due to stress that represents the patient decaying condition. One of the actions adopted to

Ingeniería e Investigación

This paper presents an experimental investigation aimed at estimating the thermal efficiency of a... more This paper presents an experimental investigation aimed at estimating the thermal efficiency of a heat pipe compared to the most common elements for removing heat from a circuit (i.e., an electric fan and a fin - extended surface). The input voltage frequency for a standard power circuit was changed for the experiments, whilst all the other parameters were kept constant. An experimental statistical design was used as an analytical tool. Unexpectedly, the heat pipe showed the lowest thermal efficiency for all the experiments, although it had the advantage of being a passive element having low volume and no mobile parts.

Proceedings of the International Joint Conference on Computational Intelligence, 2009

EBioMedicine, 2018

Background: Type-2 diabetes mellitus (T2DM) is a major health problem with increasing incidence, ... more Background: Type-2 diabetes mellitus (T2DM) is a major health problem with increasing incidence, which severely impacts cardiovascular disease. Because T2DM is associated with altered gene expression and aberrant splicing, we hypothesized that dysregulations in splicing machinery could precede, contribute to, and predict T2DM development. Methods: A cohort of patients with cardiovascular disease (CORDIOPREV study) and without T2DM at baseline (at the inclusion of the study) was used (n = 215). We determined the expression of selected splicing machinery components in fasting and 4 h-postprandial peripheral blood mononuclear cells (PBMCs, obtained at baseline) from all the patients who developed T2DM during 5-years of follow-up (n = 107 incident-T2DM cases) and 108 randomly selected non-T2DM patients (controls). Serum from incident-T2DM and control patients was used to analyze in vitro the modulation of splicing machinery expression in control PBMCs from an independent cohort of healthy subjects. Findings: Expression of key splicing machinery components (e.g. RNU2, RNU4 or RNU12) from fasting and 4 h-postprandial PBMCs of incident-T2DM patients was markedly altered compared to non-T2DM controls. Moreover, in vitro treatment of healthy individuals PBMCs with serum from incident-T2DM patients (compared to non-T2DM controls) reduced the expression of splicing machinery elements found down-regulated in incident-T2DM patients PBMCs. Finally, fasting/postprandial levels of several splicing machinery components in the PBMCs of CORDIOPREV patients were associated to higher risk of T2DM (Odds Ratio N 4) and could accurately predict (AUC N 0.85) T2DM development. Interpretation: Our results reveal the existence of splicing machinery alterations that precede and predict T2DM development in patients with cardiovascular disease.

Journal of Bacteriology, 1995

We have reevaluated the gene assignments of the proline mutant alleles of some known Pro- Escheri... more We have reevaluated the gene assignments of the proline mutant alleles of some known Pro- Escherichia coli strains. Of nine proline auxotrophs included in the study, five presented phenotypes inconsistent with their previously assigned genotypes. We discuss the possible sources and the consequences of these assignment errors.

Journal of Bacteriology, 1995

Auxotrophic proA mutants of Escherichia coli were complemented by two different classes of Coryne... more Auxotrophic proA mutants of Escherichia coli were complemented by two different classes of Corynebacterium glutamicum genes. One of these was the asd gene. The E. coli asd gene also complements the same proA alleles. Complementation of proA by the asd+ gene requires a high asd dosage and the proB and the proC gene products. The reciprocal complementation pattern (asd by the proA+ gene) was not observed. This complementation appears to be due to multicopy suppression by a proline biosynthetic gene whose product was expected to play a negligible role in this pathway. The other class of complementing clones carries the C. glutamicum proA gene. Complementation of E. coli proA mutants by the C. glutamicum proA+ gene was optimal at high osmolarity.

Universidad Ciencia Y Tecnologia, Jun 1, 2006

Ingenieria E Investigacion, 2010

El presente artículo reporta los resultados de una investigación experimental relacionada con la ... more El presente artículo reporta los resultados de una investigación experimental relacionada con la determinación de la eficiencia térmica de un tubo para la transferencia de calor (TPTC o heat pipe) comparada con la de dos elementos comúnmente utilizados para disipar calor en un circuito, esto es, un ventilador y una aleta. En los ensayos se varió la frecuencia de la alimentación a un circuito de potencia estándar, manteniéndose constantes los demás parámetros. Se utilizó un diseño estadístico de experimentos como herramienta analítica. Para todos los experimentos el TPTC, inesperadamente, tuvo la menor eficiencia térmica, aunque tiene la ventaja de ser pasivo, poseer un pequeño volumen y carecer de partes móviles. Palabras clave: transferencia de calor, disipación de energía en un circuito, efecto Joule.

Memorias Del Xii Simposio Colombiano Sobre Ingenieria De Pavimentos, Jul 1, 1999

Se describe la realizacion de un estudio experimental en el laboratorio, para la determinacion de... more Se describe la realizacion de un estudio experimental en el laboratorio, para la determinacion de los porcentajes optimos de desperdicio de material plastico (llantas viejas, neumaticos usados, bolsas de leche y botellas de agua), mediante la ejecucion de los ensayos Marshall, modulo dinamico y leyes de fatiga. El material plastico es introducido en la mezcla asfaltica en el momento de mezclado del granular y el asfalto, en pedazos de aproximadamente 4 milimetros de lado. Los ensayos de modulo dinamico se realizaron a 10, 20 y 30 grados centigrados y a 1, 10 y 25 hercios de frecuencia; las leyes de fatiga se ejecutaron para tres deformaciones diferentes y a las temperaturas de 10 y 20 grados centigrados. Los resultados principales fueron los porcentajes optimos de cada material, el porcentaje de mejoramiento y la temperatura, la deformacion y la frecuencia empleada en la ejecucion de cada ensayo. Como conclusion general, se determino que existia un porcentaje de desperdicio plastico, dentro del rango especificado, que mejoraba las propiedades mecanicas de la estructura de pavimento, sin importar el ensayo, la frecuencia y la temperatura del mismo. En forma general concluye que las botellas de agua para un porcentaje de 0,4 por ciento y una temperatura de 10 y 20 grados centigrados representan los valores maximos; para 30 grados centigrados el desperdicio seran las llantas viejas a 0,1 por ciento. Ver ficha general ITRD S404191.

Investigacion Y Ciencia Universidad Autonoma De Aguascalientes, 2006

Universidad Ciencia Y Tecnologia, Jun 1, 2006

Ensayos Historia Y Teoria Del Arte, 1998

EscRITA en 1892 el preludio llevaba como título "Preludio, interludio y paráfrasis final para la ... more EscRITA en 1892 el preludio llevaba como título "Preludio, interludio y paráfrasis final para la siesta de un fauno". Con este título resulta imprescindible pensar que se trataba más bien de un acompañamiento para una presentación dramática de la obra de 'Mallarmé'; sin embargo, sólo subsistió su primera parte "Preludio". La intención primera, según su autor, era 'ilustrar' este poema, sin querer, de ninguna manera, una síntesis del poema. Son los decorados sucesivos a través de los cuales se mueven los deseos y los sueños del fauno en el calor de la hora de la siesta. Después, exhausto de perseguir la fuga temerosa de las ninfas y las náyades, se entrega al sueño embriagador, pletórico de ilusiones al fin realizadas, de posesión total en la naturaleza universal. En general, lo que Debussy quiere destacar en su alegoría del poema de Mallarmé es su "impresión", no transportando musicalmente el poema. En Mallarmé el fauno emerge de un sueño, no satisface sus deseos sino, precisamente, sumergiéndose en el sueño mismo. Es la incertidumbre del arte del poeta pues aquí es donde no sabemos si el fauno, en verdad, sueña o, está despierto, o quizás son sueños soñados despiertos. El poema refleja variedad de caracteres o fenómenos distintos intrínsecos al mismo. De un lado, existe una ninfa casta saturada de ilusiones, y del otro, una ninfa experimentada, aspirando al amor. También se escenifican dos faunos, el fauno apetente de los deleites carnales e incontrolables deseos, y, el fauno que entra en el conflicto con el deseo. Lo curioso es que ninguno de los dos ve sus objetivos satisfechos. La búsqueda de las ninfas por el fauno oscila entre la actividad y aquello que no se conmueve. El fauno está a punto de refugiarse en el sueño. En los siguientes versos Debussy se inspira para abrir su obra, en ese solo de flauta un 'solo largo' Quien disimulando en sí el desconcierto de la mejilla Sueña, en un solo largo, que nos entretenemos La belleza de alrededor por confusiones. Falsas entre ella misma y nuestro canto crédulo. Si bien el preludio tuvo aceptación del público no ocurrió lo mismo con la crítica musical especializada. Pero, en cambio, quienes estaban verdaderamente dentro del ámbito propiamente poético-musical recibieron con gran entusiasmo esta obra fundamental. El mismo Mallarmé exclamó, después de haber escuchado la interpretación de Debussy: "yo no esperaba algo parecido! Esta música prolonga la emoción de mi poema y sitúa el adorno más apasionadamente que el color", agregando que su ilustración de la siesta de

Revista Ingenierias Universidad De Medellin, Jul 1, 2009

This article describes the design and construction of a prototype system that senses objects pert... more This article describes the design and construction of a prototype system that senses objects perturbing a uniform electric field generated in a defined volume. To set up this system, an electric circuit capable of detecting any moving object even through a 0.15meter-thick brick wall was designed and built. Although the excellent electrodes sensibility to any object´s position change going into or out the field, it was found the need for a reference electrode. Tests were carried out in order to check the system´s movement sensibility. It was observed that the relative size and shape of the electrodes affects the detector's sensitivity for getting slow movements.

Gene Expression and its Regulation, 1973

The majority of the aminoacyl-tRNA synthetases recognize two or more tRNA species. The extraordin... more The majority of the aminoacyl-tRNA synthetases recognize two or more tRNA species. The extraordinary specificity of the various synthetases for their substrate tRNAs (for a recent review, see ref. 4) could be related to the base sequence of the tRNA, to its overall geometry, or to both features. It is of interest, therefore, to study changes in the tRNA sequence and the effect of such changes in biosynthetic systems.

Soundings, 2004

Two responses to some of the issues raised in our Soundings 26 discussion on the global and the l... more Two responses to some of the issues raised in our Soundings 26 discussion on the global and the local. 1 Oscar Reyes What does it mean to 'think the global locally?' At the most basic level, the contributors to this discussion converged on the view that the global and the local are constructed in relation to each other-which means that the forms that this relationship currently takes remain open to challenge. This is by no means as obvious as it might seem-a point that is well made by drawing a contrast with neo-liberal assumptions, which tend to depoliticise the global/ local relationship under the banner of 'globalisation'. Neo-liberals announce that the global is subject to a market logic that is beyond popular control, and that the local should merely equip us to face the challenges that it brings: There Is No Alternative (TINA). When globalisation operates in this way the results can be profoundly disempowering. We are asked to accept that there can be no significant 1. 'Thinking the global locally: roundtable discussion with Katharine Ainger, Jane Foot, Clare Joy and Doreen Massey', Soundings 26.

Química Nova, 2010

Recebido em 11/6/09; aceito em 11/9/09; publicado na web em 24/2/10 CHEMICAL STUDY AND ANTIFOULIN... more Recebido em 11/6/09; aceito em 11/9/09; publicado na web em 24/2/10 CHEMICAL STUDY AND ANTIFOULING ACTIVITY OF CARIBBEAN OCTOCORAL Eunicea laciniata. The bioassay guided purification of the octocoral Eunicea laciniata organic extract, collected at Santa Marta bay, Colombia, allowed the isolation of the new compound (-)-3β-pregna-5,20-dienyl-β-D-arabinopyranoside (1), along with the known compounds 1(S*),11(R*)-dolabell-3(E),7(E),12(18)-triene (2), 13-keto-1(S),11(R)-dolabell-3(E),7(E),12(18)-triene (3), cholest-5,22-dien-3β-ol (4), cholesterol (5), y brassicasterol (6). The structure and absolute configuration of 1 was determined on based spectroscopic analyses (NMR and CD). The extract showed antifouling activity against five strains of marine bacteria associated to heavy fouled surfaces. Also showed activity against the cypris of the cosmopolitan barnacle Balanus amphitrite, and low toxicity in Artemia salina test.

2014 XIX Symposium on Image, Signal Processing and Artificial Vision, 2014

ABSTRACT The Discrete Wavelet Transform (DWT) is an important technique for signal analysis, comp... more ABSTRACT The Discrete Wavelet Transform (DWT) is an important technique for signal analysis, compressing and denoising due to its excellent locality in the time-frequency domain. The DWT is developed by convolutions which demand both a large number of mathematical operations and a large amount of storage. The lifting scheme reduces both computational and storage requirements. We have developed a computational architecture for inverse DWT using the lifting scheme. The design was developed in VHDL and then implemented into a Virtex 5 FPGA. We aim to reach a high throughput and reduce the design area. The architecture takes 3L + N(1 − 0.5L) clock cycles to compute L levels of 1D reconstruction for a data of size N. Some comparisons suggest that our work could be faster than previous works.

This article presents the main characteristics of the design and con- struction of a prototype to... more This article presents the main characteristics of the design and con- struction of a prototype to measure heat flux, acquiring temperature variation and using noninvasive temperature sensors. The conditions of a post-surgical patient are related to energy consumption as a part of the metabolic answer due to stress that represents the patient decaying condition. One of the actions adopted to