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Search Results: 1 - 10 of 503678 matches for " Carlos A Botella Valle "
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Complicaciones de la capsulotomía posterior por láser de Nd-Yag en el Centro Oftalmológico "Enrique Cabrera" de La Habana
Botella Valle,Carlos A; Torriente Torriente,Vladimir O; Martínez Legón,Zoila C; Triana Casado,Idalia;
MEDISAN , 2012,
Abstract: introduction: the posterior capsular opacity is the most frequent complication in the cataract surgery and, although capsulotomy with nd-yag laser is a very effective procedure to solve it, it is not free of complications. objective: to describe the complications in patients exposed to capsulotomy with nd-yag laser.methods: a descriptive and prospective study of 104 patients with posterior capsular opacity, assisted in "enrique cabrera" ophthalmological center from havana, was carried out during the 2010. variables of frequency and type of complication, age, sex, pathological ocular and systemic medical history, classification of the capsular opacity, energy used, as well as visual acuity before and after the treatment were analyzed.results: the increase of the intraocular pressure and the cystic macular edema as the most common complications, the 56-75 year-old patients, female sex, as well as the capsular fibrotic opacity and the capsulotomy with more than 8,0 mj prevailed in the case material.conclusions: more than half of the patients presented complications of transitory and reversible type, which were not related to the quantity of energy used; the visual improvement after the procedure was remarkable.
Complicaciones de la capsulotomía posterior por láser de Nd-Yag en el Centro Oftalmológico "Enrique Cabrera" de La Habana Complications of posterior capsulotomy due to Nd-Yag laser in "Enrique Cabrera" Ophthalmological Center from Havana
Carlos A Botella Valle,Vladimir O Torriente Torriente,Zoila C Martínez Legón,Idalia Triana Casado
MEDISAN , 2012,
Abstract: Introducción: La opacidad capsular posterior es la complicación más frecuente de la cirugía de catarata y, aunque la capsulotomía con láser de Nd-Yag es un procedimiento muy efectivo para solucionarla, no está exenta de complicaciones.Objetivo: Describir las complicaciones en pacientes expuestos a capsulotomía con láser de Nd-Yag.Métodos: Se realizó un estudio descriptivo y prospectivo de 104 pacientes con opacidad capsular posterior, atendidos en el Centro Oftalmológico "Enrique Cabrera" de la Habana, durante el 2010. Se analizaron las variables frecuencia y tipo de complicaciones, edad, sexo, antecedentes patológicos personales oculares y sistémicos, clasificación de la opacidad capsular, energía utilizada, así como agudeza visual antes y después del tratamiento.Resultados: En la casuística predominaron el aumento de la presión intraocular y el edema macular quístico como las complicaciones más comunes, los pacientes de 56-75 a os, el sexo femenino, así como la opacidad capsular fibrótica y la capsulotomía con más de 8,0 MJ.Conclusiones: Más de la mitad de los afectados presentaron complicaciones de carácter transitorio y reversible, las cuales no estuvieron relacionadas con la cantidad de energía empleada; la mejoría visual después del proceder fue notable. Introduction: The posterior capsular opacity is the most frequent complication in the cataract surgery and, although capsulotomy with Nd-Yag laser is a very effective procedure to solve it, it is not free of complications. Objective: To describe the complications in patients exposed to capsulotomy with Nd-Yag laser.Methods: A descriptive and prospective study of 104 patients with posterior capsular opacity, assisted in "Enrique Cabrera" Ophthalmological Center from Havana, was carried out during the 2010. Variables of frequency and type of complication, age, sex, pathological ocular and systemic medical history, classification of the capsular opacity, energy used, as well as visual acuity before and after the treatment were analyzed.Results: The increase of the intraocular pressure and the cystic macular edema as the most common complications, the 56-75 year-old patients, female sex, as well as the capsular fibrotic opacity and the capsulotomy with more than 8,0 MJ prevailed in the case material.Conclusions: More than half of the patients presented complications of transitory and reversible type, which were not related to the quantity of energy used; the visual improvement after the procedure was remarkable.
Offset Printing Plate Quality Sensor on a Low-Cost Processor
Jelena Poljak,Guillermo Botella,Carlos García,Sanja Mahovi? Polja?ek,Manuel P. Matías,Francisco Tirado
Sensors , 2013, DOI: 10.3390/s131114277
Abstract: The aim of this work is to develop a microprocessor-based sensor that measures the quality of the offset printing plate through the introduction of different image analysis applications. The main features of the presented system are the low cost, the low amount of power consumption, its modularity and easy integration with other industrial modules for printing plates, and its robustness against noise environments. For the sake of clarity, a viability analysis of previous software is presented through different strategies, based on dynamic histogram and Hough transform. This paper provides performance and scalability data compared with existing costly commercial devices. Furthermore, a general overview of quality control possibilities for printing plates is presented and could be useful to a system where such controls are regularly conducted.
Acute human brain responses to intracortical microelectrode arrays: Challenges and future prospects
Eduardo Fernandez,Bradley Greger,Paul A. House,Carlos Botella,Julio Albisua,Cristina Soto-Sanchez
Frontiers in Neuroengineering , 2014, DOI: 10.3389/fneng.2014.00024
Abstract: The emerging field of neuroprosthetics is focused on the development of new therapeutic interventions that will be able to restore some lost neural function by selective electrical stimulation or by harnessing activity recorded from populations of neurons. As more and more patients benefit from these approaches, the interest in neural interfaces has grown significantly and a new generation of penetrating microelectrode arrays are providing unprecedented access to the neurons of the CNS. These microelectrodes have active tip dimensions that are similar in size to neurons and because they penetrate the nervous system, they provide selective access to these cells (within a few microns). However, the very long-term viability of chronically implanted microelectrodes and the capability of recording the same spiking activity over long time periods still remain to be established and confirmed in human studies. Here we review the main responses to acute implantation of microelectrode arrays, and emphasize that it will become essential to control the neural tissue damage induced by these intracortical microelectrodes in order to achieve the high clinical potentials accompanying this technology.
Recovery Process on Soft-Bottom Macrobenthic Communities after Artificial Disturbance in Tropical Polluted Estuary (Guanabara Bay, Rio de Janeiro, Brazil)  [PDF]
Cecília do Valle Pinto Pereira, Leandro Amaro Pessoa, Marcos Aurélio Vasconcelos de Freitas, Carlos Alejandro Echeverría
Open Journal of Marine Science (OJMS) , 2013, DOI: 10.4236/ojms.2013.34018
Abstract:

The regime of disturbance with natural or anthropogenic origin can lead to the destabilization or even to a mass mortality of benthic communities. Due to the heterogeneity of the disturbance there is a formation of patches in different stages of ecological succession. The aim of this study is to follow and describe the resilience in artificial disturbed sediment in a polluted bay in Rio de Janeiro. The sediment was collected, sterilized and placed inside corers (10 cmdiameter ×15 cmheight) in the same place where it was collected. We allocated the samples in two structures, the difference between them was that one was placed closed to the bottom and the other was placed50 cmheight. We found 2352 organisms distributed in 14 taxons. The class Polychaeta and the order Amphipoda showed the highest density in all the survey and treatments. We identified the factors influencing the scenarium: different mechanisms of dispersal, the position of the structures and life history of each group. Disturbance can be the main cause of the patch’s diversity found in estuaries and coastal areas. Because of this, monitoring of selected areas becomes an important tool to understand the regime of disturbance as a key factor structuring benthic communities in soft sediment, also suggesting a metapopulation dynamics.

Total carbon accumulation in a tropical forest landscape
Carlos A. Sierra, Jorge I. del Valle, Hector I. Restrepo
Carbon Balance and Management , 2012, DOI: 10.1186/1750-0680-7-12
Abstract:
Quantitation of diarrhetic shellfish poisoning toxins in Chilean Mussel using pyrenyldiazomethane as fluorescent labeling reagent
GARCíA,CARLOS; PEREIRA,PAULO; VALLE,LUIS; LAGOS,NéSTOR;
Biological Research , 2003, DOI: 10.4067/S0716-97602003000200007
Abstract: diarrhetic shellfish poisoning (dsp) is a gastrointestinal disease caused by lipid soluble polyether toxins produced by dinoflagellates and accumulated in shellfish. diarrhetic shellfish poisoning is a worldwide threat to public health and the shellfish industry. to date, only four lipid soluble polyethers have been known as diarrhetic shellfish toxins. among them, okadaic acid (oa), dinophysistoxin 1 (dtx-1, 35-methyl oa), dinophysistoxin 2 (dtx-2, oa isomers) and dinophysistoxin 3 (dtx-3, 7-o-acyl-35-methyl oa), all of which have free carboxilic groups. to perform quantitative analysis of dsp toxins in shellfish samples is a requirement, because dsp toxins are endemic in the chilean mollusks of the southern regions, and although human symptoms of dsp appear relatively mild in comparison with the paralytic shellfish poisoning (psp), the necessity of monitoring the chronic effects of continued uptake of low doses of dsp toxins more closely is imperative, since dsp toxins have been described as potent tumor promoters. this paper shows the synthesis pathway of a chromophore, 1-pyrenyldiazomethane (pdam), a fluorescent labeling reagent for determination of carboxilic acids, using high performance liquid chromatography with fluorescence on-line detection . this procedure was developed in order to have a quantitative method for dsp toxins analysis that would be useful for health public services and private shellfish industries. the features of this labeling reagent are compared against adam and used for quantitative analysis of dsp toxins in chilean mussels and cultured dinoflagellates samples.
Quantitation of diarrhetic shellfish poisoning toxins in Chilean Mussel using pyrenyldiazomethane as fluorescent labeling reagent
CARLOS GARCíA,PAULO PEREIRA,LUIS VALLE,NéSTOR LAGOS
Biological Research , 2003,
Abstract: Diarrhetic shellfish poisoning (DSP) is a gastrointestinal disease caused by lipid soluble polyether toxins produced by dinoflagellates and accumulated in shellfish. Diarrhetic shellfish poisoning is a worldwide threat to public health and the shellfish industry. To date, only four lipid soluble polyethers have been known as diarrhetic shellfish toxins. Among them, Okadaic acid (OA), Dinophysistoxin 1 (DTX-1, 35-methyl OA), Dinophysistoxin 2 (DTX-2, OA isomers) and Dinophysistoxin 3 (DTX-3, 7-O-acyl-35-methyl OA), all of which have free carboxilic groups. To perform quantitative analysis of DSP toxins in shellfish samples is a requirement, because DSP toxins are endemic in the Chilean mollusks of the southern regions, and although human symptoms of DSP appear relatively mild in comparison with the Paralytic Shellfish Poisoning (PSP), the necessity of monitoring the chronic effects of continued uptake of low doses of DSP toxins more closely is imperative, since DSP toxins have been described as potent tumor promoters. This paper shows the synthesis pathway of a chromophore, 1-pyrenyldiazomethane (PDAM), a fluorescent labeling reagent for determination of carboxilic acids, using High Performance Liquid Chromatography with fluorescence on-line detection . This procedure was developed in order to have a quantitative method for DSP toxins analysis that would be useful for health public services and private shellfish industries. The features of this labeling reagent are compared against ADAM and used for quantitative analysis of DSP toxins in Chilean mussels and cultured dinoflagellates samples.
A Low Cost Matching Motion Estimation Sensor Based on the NIOS II Microprocessor
Diego González,Guillermo Botella,Uwe Meyer-Baese,Carlos García,Concepción Sanz,Manuel Prieto-Matías,Francisco Tirado
Sensors , 2012, DOI: 10.3390/s121013126
Abstract: This work presents the implementation of a matching-based motion estimation sensor on a Field Programmable Gate Array (FPGA) and NIOS II microprocessor applying a C to Hardware (C2H) acceleration paradigm. The design, which involves several matching algorithms, is mapped using Very Large Scale Integration (VLSI) technology. These algorithms, as well as the hardware implementation, are presented here together with an extensive analysis of the resources needed and the throughput obtained. The developed low-cost system is practical for real-time throughput and reduced power consumption and is useful in robotic applications, such as tracking, navigation using an unmanned vehicle, or as part of a more complex system.
Implementation of a Low-Cost Mobile Devices to Support Medical Diagnosis
Carlos García Sánchez,Guillermo Botella Juan,Fermín Ayuso Márquez,Diego González Rodríguez,Manuel Prieto-Matías,Francisco Tirado Fernández
Computational and Mathematical Methods in Medicine , 2013, DOI: 10.1155/2013/287089
Abstract: Medical imaging has become an absolutely essential diagnostic tool for clinical practices; at present, pathologies can be detected with an earliness never before known. Its use has not only been relegated to the field of radiology but also, increasingly, to computer-based imaging processes prior to surgery. Motion analysis, in particular, plays an important role in analyzing activities or behaviors of live objects in medicine. This short paper presents several low-cost hardware implementation approaches for the new generation of tablets and/or smartphones for estimating motion compensation and segmentation in medical images. These systems have been optimized for breast cancer diagnosis using magnetic resonance imaging technology with several advantages over traditional X-ray mammography, for example, obtaining patient information during a short period. This paper also addresses the challenge of offering a medical tool that runs on widespread portable devices, both on tablets and/or smartphones to aid in patient diagnostics. 1. Introduction Medical imaging [1] as a diagnostic technique in medicine requires complex image analysis of image sequences obtained by a plethora of variety, such as ECG, X-ray, MRI, ultrasound, CT, and so forth. Magnetic resonance imaging (MRI) [2] technology is one of the most promising tools over other methods, like conventional X-ray mammography, regarding breast cancer diagnosis. Nowadays, X-ray images still have a higher spatial resolution than MR images, but this technique has the advantages of producing natural tridimensional images and being able to noninvasively monitor the contrast agent concentration in the depicted tissue over time. On other hand, motion estimation is still an open problem with important applications to medical imaging. Attending to the estimation of a pixel motion inside the image sequence, there are many models and algorithms that could be classified as belonging to the matching domain approximations [3], energy models [4], and gradient models [5]. Related to this last family, different studies [6–8] show that this represents an admissible choice for keeping a tolerable trade-off between accuracy and computing resources. For designing systems operating efficiently, many challenges must be dealt with, such as robustness, static patterns, illumination changes, different kinds of noise, contrast invariance, and so forth. Regarding the hardware platform used, the portable industry in recent years has dramatically increased the importance of the processing hardware elements. The iPhone 3GS offered more
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