JUAN CARLOS CASTILLO SILVA - Academia.edu (original) (raw)
Papers by JUAN CARLOS CASTILLO SILVA
HortTechnology
Pecans [Carya illinoinensis (Wangenh. C.) Koch] were harvested weekly for 9 and 7 weeks until nor... more Pecans [Carya illinoinensis (Wangenh. C.) Koch] were harvested weekly for 9 and 7 weeks until normal harvest time during 1986 and 1987, respectively. Kernels were tested for chemical, physical, and sensory properties. Moisture decreased from 13% at initial harvest time to 4% to 6% by normal harvest. Free fatty acids decreased from 0.5% to 0.2% by the third week before normal harvest. Tannins fluctuated, but averaged about 0.8%. Hue angle remained constant from the fourth week to normal harvest. Shear force increased from 90 to 135 N by the second week before normal harvest. Pecans can be harvested about 2 weeks before normal harvest without significant quality deficiencies.
Revista Cubana De Oftalmologia, Jun 1, 2008
... Hernández Silva I ; Katty Naranjo Venegas II ; Marcelino Río Torres III ; Meisy Ramos López I... more ... Hernández Silva I ; Katty Naranjo Venegas II ; Marcelino Río Torres III ; Meisy Ramos López I ; Lucy Pons Castro IV ; Belkys Rodríguez Suárez II. ... En todos los casos hubo un aumento significativo de la agudeza visual sin corrección y con ella, del preoperatorio al posoperatorio. ...
Multimedia Systems, 2013
ABSTRACT As mobile phones become smarter and include a wider and more powerful array of sensory c... more ABSTRACT As mobile phones become smarter and include a wider and more powerful array of sensory components, the opportunity to leverage those capabilities in contexts other than telephony grows. We have in particular identified those sensory capabilities as key components for modern user interfaces that can detect movement, actions and intentions to enrich human-computer interaction in a natural way. In this work, we present research around using smartphones as input controllers in the context of exertion videogames. We propose a conceptual framework that identifies the core elements of such interfaces, regardless of the underlying technological platforms, and provides a design pattern for their integration into existing videogames without having to change the game’s source code. We present a proof of concept implementation for the framework, with two smartphone input controllers, which using a soft button and accelerometer data, interface to a target-shooting exertion game played while exercising on a stationary bicycle. We present findings from a user experience evaluation.
Http Dx Doi Org 10 1300 J028v04n03_03, Oct 18, 2010
ABSTRACT The storage quality of channel catfish (Ictalurus punctatus), following long term frozen... more ABSTRACT The storage quality of channel catfish (Ictalurus punctatus), following long term frozen storage, fed diets containing 5 and 10 times the normal level of vitamin E for 45 or 60 days prior to harvest, was evaluated. There were no unusual effects of treatment on fish weight, survival or feed conversion ratios. Muscle vitamin E content was higher (P < 0.05) from fed diets containing supplemental vitamin E than in the control. Oxidation as measured by TBARS and sensory analysis values did not differ (P > 0.05) in response to vitamin E supplementation. Lipid oxidation increased as storage time increased. Lack of change in phospholipid and neutral lipid fractions during storage indicated that autoxidations was the major cause of oxidation in catfish. Vitamin E levels up to 10 times the normal amount did not improve the overall quality of catfish fillets.
Gaceta Mexicana De Oncologia, May 1, 2009
Scientia agropecuaria, 2011
Resumen Se evaluó el crecimiento de Tetraselmis suecica. El experimento fue realizado aplicando l... more Resumen Se evaluó el crecimiento de Tetraselmis suecica. El experimento fue realizado aplicando la Metodología de Superficie de Respuesta (MSR) con un Diseño Central Compuesto Rotacional (DCCR) con dos factores; pH y concentración sanguaza/agua de mar, en los rangos de 7-9 y 2-5 % (v/v) respectivamente. Los medios de cultivo fueron agitados por burbujeo de aire constante (0.07 L/s) e iluminados de manera continua con luz fluorescente de 40 W en recipientes de vidrio de 1.5 L de capacidad a una temperatura de 22.5 ± 2.1 °C. Se determinó, utilizando el modelo matemático de Gompertz, que a partir de un pH de 8.0 y una concentración de sanguaza/agua de mar de 3.5% se logra el crecimiento máximo de Tetraselmis suecica. Un pH de 8.71 y una concentración de sanguaza/agua de mar de 4.56% permiten obtener un crecimiento máximo (logN/N 0) de Tetraselmis suecica de 0.659, con un error de 12.3% al aplicar un modelo matemático de 2º orden. Los valores obtenidos con el medio de cultivo sanguaza/agua de mar, superaron al medio de cultivo tradicionalmente usado (Guillard F/2 con agua de mar). Los resultados demuestran la potencialidad de uso del medio sanguaza/agua de mar en estudios escalables a nivel piloto de producción de Tetraselmis suecica, con miras a la producción de biodiesel.
Electroencephalography and Clinical Neurophysiology, 1995
In a previous paper, using the same test for the evaluation of reading-writing abilities, Harmony... more In a previous paper, using the same test for the evaluation of reading-writing abilities, Harmony et al. (1990b) reported that children with severe difficulties had more delta in fronto-temporal regions, and this was interpreted as a sign of underlying cerebral dysfunction. Children with severe and minor difficulties in the test had more diffuse theta absolute and relative powers and less alpha relative power. As theta decreases with age, while alpha increases, these results suggested that children with minor and severe difficulties in reading had a maturational lag with respect to those with normal performance. We conducted this study in order to test this hypothesis. Two different EEG records were obtained with an interval of 2.58-3.15 years in 49 children classified in 3 groups according to their performance in a reading-writing test. Group 1: adequate performance for age and degree (control group); group 2: below level performance with minor difficulties; and group 3: below level performance, with severe difficulties. The mean age of the groups in the first study was 9 years. Absolute (AP) and relative powers (RP) in the delta, theta, alpha and beta bands were computed for each session. In general, groups 3 and 2 showed greater changes than group 1 from session to session. ANOVAs performed by session clearly demonstrate many significant differences between groups in the first study, while few significant differences in parieto-occipital regions in theta RP were observed in the second session. These results point toward a maturational spurt of children from groups 2 and 3.
Electroencephalography and Clinical Neurophysiology, 1995
EEG activation patterns during the performance of tasks involving different components of mental ... more EEG activation patterns during the performance of tasks involving different components of mental calculation
Clinical EEG and Neuroscience, 2002
The sources of different EEG frequencies were studied in 25 normal children and 46 learning disab... more The sources of different EEG frequencies were studied in 25 normal children and 46 learning disabled (not otherwise specified) children between 7 and 11 years old. The EEG sources were computed using Frequency-domain Variable Resolution Electromagnetic Tomography which produces a three dimensional picture of the currents at each EEG frequency. Significant differences between groups were observed. LD children showed more theta activity (3.5 to 7.02 Hz) in the frontal lobes and control children more alpha (9.75 to 12.87 Hz) in occipital areas. These results may support the maturational lag hypothesis, as the neurobiological cause of learning deficiencies not otherwise specified.
Haptics Rendering and Applications, 2012
Colombian Journal of Anesthesiology, 2013
ABSTRACT IntroductionNeurogenic bladder predispose to patients with spinal cord injuria to reflex... more ABSTRACT IntroductionNeurogenic bladder predispose to patients with spinal cord injuria to reflex incontinence, urinary tract infections, autonomic dysreflexia and renal failure, which is one of the key causes of mortality. Neuromodulation of the anterior sacral roots is a treatment for bladder dysfunction. The anesthesiology publications about this procedure are very rarely.Objectives To describe the hemodynamic behavior and the adverse events during the intraoperative and immediate postoperative period of patients undergoing implantation of the sacral anterior roots stimulator.Methods Retrospective, descriptive study of series of cases of patients with chronic spinal cord trauma implanted with the anterior sacral roots stimulator.ResultsOut of 50 patients studied, 34% had an upper chest injury, 58% had a spinal injury secondary to a fire weapon bullet, 40% had a history of autonomic dysreflexia, 98% were had arterial line monitoring, 90% of the patients were hypotensive and 86% required vasopressors; 34% experienced bradycardia and 88% required atropine management.Conclusions Hypotension and bradycardia are the major adverse events in the management of these patients, but they exhibit adequate response to medical treatment. Studies are needed to assess the association between the level of the injury versus the presence of bradycardia and hypotension and the ideal monitoring during the procedure.ResumenIntroducciónLa vejiga neurogénica predispone a los pacientes con traumatismo raquimedular a incontinencia refleja, infecciones del tracto urinario, disreflexia autonómica y fallo renal, el cual es una de las principales causas de mortalidad. La neuromodulación de las raíces sacras anteriores es un tratamiento de la disfunción vesical. Es raro encontrar publicaciones en anestesiología sobre este procedimiento.ObjetivosDescribir el comportamiento hemodinámico y los efectos adversos durante el intraoperatorio y post-operatorio inmediato en los pacientes que han recibido implantación de estimulador de raíces sacras anteriores.MétodosEstudio descriptivo retrospectivo de pacientes con trauma- tismo raquimedular crónico que han recibido implantación de estimulador de raíces sacras anteriores.ResultadosDe 50 pacientes estudiados, el 34% tenían lesión torácica alta, un 58% tenía lesión espinal secundaria a herida por proyectil de arma de fuego, el 40% con antecedente de disreflexia autonómica, el 98% empleo de monitoría con línea arterial, el 90% de los pacientes presentó hipotensión y el 86% requirió manejo vasopresor, el 34% presentó bradicardia y el 88% requirió manejo con atropina.ConclusionesLa hipotensión y la bradicardia son los principales efectos adversos durante el manejo de estos pacientes pero con adecuada respuesta al tratamiento médico. Se deben realizar estudios que evalúen la asociación entre nivel de la lesión con bradicardia e hipotensión y la monitorización ideal durante este procedimiento.
Revista médica de Chile, 2005
Prevalence of antibiotic resistant Enterococcus spp in waste waters in the north of Chile Backgro... more Prevalence of antibiotic resistant Enterococcus spp in waste waters in the north of Chile Background: There is little information available in Chile on the distribution of Enterococcus spp in waste water and its implications in transmission of antibiotic resistance through the water cycle. Enterococcus spp are common in nosocomial infections and may spread antibiotic resistance through the food chain. Aim: To determine the presence of antibiotic resistant Enterococcus spp in the sewage of Antofagasta, Chile. Material and Methods: Samples of sewage from two sewage treatment plants and from the Public Hospital of Antofagasta collector were obtained. Enterococcus spp were isolated on m-Enterococcus agar containing ampicillin, vancomycin and streptomycin. The isolates were identified and subjected to biochemical typing (PhPlate). Minimal inhibitory concentration determination was performed by agar dilution technique. Results: High counts of resistant Enterococcus spp were found on the streptomycin plates, lower on ampicillin and very low on vancomycin plates. A total of 63 Enterococcus spp strains were typed and the identification showed 5 different species; E faecalis (65%), E faecium (14%), E hirae (13%), E durans (6%) and E gallinarum (2%). The typing revealed a high diversity among the isolates. Two biochemical phenotypes were predominant, C1 (21 strains) and C6 (7 strains). Both were highly resistant to gentamycin and streptomycin; moderately resistant to ampicillin, cloramphenicol, tetracycline and ciprofloxacin, and with intermediate susceptibility to vancomycin. Both phenotypes were found in the sewage of the hospital collector and in the treatment plants. Conclusions: In the sewage of Antofagasta we found dominating phenotypes of multiresistant Enterococcus spp. Sewage could be an important way of transmission of these microorganisms (
Survey of Ophthalmology, 2012
We review what is known in each country of the Latin American region with regards to blindness an... more We review what is known in each country of the Latin American region with regards to blindness and visual impairment and make some comparisons to Hispanic populations in the United States. Prevalence of blindness varied from 1.1% in Argentina to 4.1% in Guatemala in people 50 years of age and older, with the major cause being cataract. Diabetic retinopathy and glaucoma are starting to make serious inroads, although epidemiological data are limited, and age-related macular degeneration is now a concern in some populations. Infectious diseases such as trachoma and onchocerciasis are quickly diminishing. Although progress has been made, retinopathy of prematurity remains the major cause of childhood blindness. If VISION 2020 is to succeed, many more epidemiological studies will be needed to set priorities, although some can be of the Rapid Assessment of Avoidable Blindness design. Developing the infrastructure for screening and treatment of ophthalmic disease in Latin America continues to be a challenge.
Journal of Rapid Methods and Automation in Microbiology, 2003
Whole (deheaded and eviscerated) channel catfish were dipped in 1 or 2 % lactic acid or sodium pe... more Whole (deheaded and eviscerated) channel catfish were dipped in 1 or 2 % lactic acid or sodium percarbonate (Pergenox 7. Whole and fillets were also washed with high-pressure water or 8% sodium tripolyphosphate (STPP). Impedance detection time (IDT) was recorded for rinsates of the products. Fish dipped in 2 % lactic acid had higher initial IDT than those dipped in 1 95 lactic acid. Regardless of lactic acid concentration, IDT were the same in products held more than one day at 4C. Similar results were achieved forproducts dipped in Pergenox ' ? Fillets spray-washed in STPP had higher IDT than those dipped or spray-washed with water; the difference being pronounced after six days at 4C. For whole fish, STPP had a very significant initial reduction in microbial counts (higher IDT). Exposing the product to high-pressure spray wash for a short time did not have a signQicant effect on IDT, but the addition of STPP in the water did increase IDT, thus shelf-life.
International Journal of Psychophysiology, 1998
Recent studies have suggested that anxiety disorders such as animal phobias are mediated not only... more Recent studies have suggested that anxiety disorders such as animal phobias are mediated not only by fear but also by
International Journal of Food Microbiology, 2010
Starch-based films impregnated with fresh tannic acid (FTA/starch film) and thermally processed t... more Starch-based films impregnated with fresh tannic acid (FTA/starch film) and thermally processed tannic acid (PTA/starch film) were assessed for inhibition of Escherichia coli O157:H7 and Listeria monocytogenes. Disc-diffusion assay revealed that the PTA/starch film showed larger clear zone around the film on the bacterial lawn than the FTA/starch film at the same tannic acid concentrations (0.45 to 4.5 mg per disc). Viable cell count assays in tryptic soy broth showed that the PTA/starch film also had a stronger antimicrobial activity on these foodborne pathogens than the FTA/starch film. L. monocytogenes did not replicate in trypic soy broth containing the FTA/starch film for the first 8 h but multiplied up to 9.22 log CFU/ml at 48 h of incubation. The PTA/starch film caused a 2.72-log decrease in L. monocytogenes cells over the same time period. While 5-log E. coli O157:H7 cells were inactivated by the FTA/starch film within 48 h, more than 7-log E. coli O157:H7 cells were killed by the PTA/starch film over the same period. The antimicrobial activity of FTA/starch and PTA/starch film was primarily pH independent. HPLC measurement of the FTA or PTA release from starch film in water revealed that their release kinetic curves were in well match with their inactivation curves for E. coli O157:H7 and L. monocytogenes in 0.1% peptone water. In addition to antimicrobial activity, FTA showed antioxidant activity on soybean oil by doubling the induction time of oil oxidation. PTA further enhanced the oxidative stability of the oil by 17%. These results suggested that the use of processed tannic acid in starch films could improve the safety and quality of foods.
Clinical & Experimental Ophthalmology, 2012
Background: To determine if gender inequities exist in Latin America in regard to cataract surger... more Background: To determine if gender inequities exist in Latin America in regard to cataract surgery. Design: Meta-analysis. Participants: Total of 38 992 subjects participating in epidemiological surveys; summary measures were used (not patient-level data). Methods: A literature search and knowledge of rapid assessment of cataract surgical services/rapid assessment of avoidable blindness studies carried out in Latin America found 11 studies with complete cataract surgical coverage (CSC) data. Using summary original study data, a meta-analysis (random effects model) was conducted to analyse the differences in CSC between males and females. Results were adjusted for design effect. Main Outcome Measures: Odds ratio (OR) of receiving cataract surgery comparing women with men. Results: CSC with a visual acuity (VA) <3/60 on an eye basis showed a non-statistically significant OR of 1.01 (95% confidence intervals [CI]: 0.86-1.18) for women receiving cataract surgery in comparison with men. For VA < 6/18, a non-statistically significant OR of 0.94 (95% CI: 0.83-1.07) was obtained for women receiving cataract surgery. On a person basis at a VA of <3/60 and <6/18, non-statistically significant ORs of 1.12 (95% CI: 0.78-1.63) and 0.94 (95% CI: 0.77-1.15) were obtained for women receiving cataract surgery, respectively. Statistical heterogeneity was 0% (I 2 statistic), except for results at a VA of <3/60 on a person basis (I 2 = 30%). Conclusions: In the Latin American countries in which CSC was assessed, gender does not appear to be a significant factor in receiving cataract surgery. However, more data are required to confirm these results.
British Journal of Ophthalmology, 2014
Objective To present regional estimates of the magnitude and temporal trends in the prevalence an... more Objective To present regional estimates of the magnitude and temporal trends in the prevalence and causes of blindness and moderate/severe visual impairment (MSVI) in Latin America and the Caribbean (LAC). Methods A systematic review of cross-sectional population-representative data from published literature and unpublished studies was accessed and extracted to model the estimated prevalence of vision loss by region, country and globally, and the attributable cause fraction by region. Results In the LAC combined region, estimated all-age both-gender age-standardised prevalence of blindness halved from 0.8% (0.6 to 1.1) in 1990 to 0.4% (0.4 to 0.6) in 2010 and MSVI decreased from 4.3% (3.1 to 5.3) to 2.7% (2.2 to 3.4). In the Caribbean, estimated all-age both-gender age-standardised prevalence of blindness decreased from 0.6% (0.4 to 0.8) in 1990 to 0.5% (0.4 to 0.6) in 2010 and MSVI decreased from 3.3% (1.3 to 4.1) in 1990 to 2.9% (1.8 to 3.8). In the LAC regions combined, there was an estimated 2.3 million blind and 14.1 million with MSVI in 2010. In 2010, cataract continues to contribute the largest proportion of blindness, except in Southern Latin America where macular degeneration is most common. In 2010, uncorrected refractive error was the most common cause of MSVI. Conclusions While models suggest a decrease in agestandardised prevalence estimates, better data are needed to evaluate the disparities in the region. The increasing numbers of older people, coupled with the increase in vision loss associated with older age, will require further intervention to continue to reduce prevalence rates and to prevent a rise in absolute numbers of blind.
HortTechnology
Pecans [Carya illinoinensis (Wangenh. C.) Koch] were harvested weekly for 9 and 7 weeks until nor... more Pecans [Carya illinoinensis (Wangenh. C.) Koch] were harvested weekly for 9 and 7 weeks until normal harvest time during 1986 and 1987, respectively. Kernels were tested for chemical, physical, and sensory properties. Moisture decreased from 13% at initial harvest time to 4% to 6% by normal harvest. Free fatty acids decreased from 0.5% to 0.2% by the third week before normal harvest. Tannins fluctuated, but averaged about 0.8%. Hue angle remained constant from the fourth week to normal harvest. Shear force increased from 90 to 135 N by the second week before normal harvest. Pecans can be harvested about 2 weeks before normal harvest without significant quality deficiencies.
Revista Cubana De Oftalmologia, Jun 1, 2008
... Hernández Silva I ; Katty Naranjo Venegas II ; Marcelino Río Torres III ; Meisy Ramos López I... more ... Hernández Silva I ; Katty Naranjo Venegas II ; Marcelino Río Torres III ; Meisy Ramos López I ; Lucy Pons Castro IV ; Belkys Rodríguez Suárez II. ... En todos los casos hubo un aumento significativo de la agudeza visual sin corrección y con ella, del preoperatorio al posoperatorio. ...
Multimedia Systems, 2013
ABSTRACT As mobile phones become smarter and include a wider and more powerful array of sensory c... more ABSTRACT As mobile phones become smarter and include a wider and more powerful array of sensory components, the opportunity to leverage those capabilities in contexts other than telephony grows. We have in particular identified those sensory capabilities as key components for modern user interfaces that can detect movement, actions and intentions to enrich human-computer interaction in a natural way. In this work, we present research around using smartphones as input controllers in the context of exertion videogames. We propose a conceptual framework that identifies the core elements of such interfaces, regardless of the underlying technological platforms, and provides a design pattern for their integration into existing videogames without having to change the game’s source code. We present a proof of concept implementation for the framework, with two smartphone input controllers, which using a soft button and accelerometer data, interface to a target-shooting exertion game played while exercising on a stationary bicycle. We present findings from a user experience evaluation.
Http Dx Doi Org 10 1300 J028v04n03_03, Oct 18, 2010
ABSTRACT The storage quality of channel catfish (Ictalurus punctatus), following long term frozen... more ABSTRACT The storage quality of channel catfish (Ictalurus punctatus), following long term frozen storage, fed diets containing 5 and 10 times the normal level of vitamin E for 45 or 60 days prior to harvest, was evaluated. There were no unusual effects of treatment on fish weight, survival or feed conversion ratios. Muscle vitamin E content was higher (P < 0.05) from fed diets containing supplemental vitamin E than in the control. Oxidation as measured by TBARS and sensory analysis values did not differ (P > 0.05) in response to vitamin E supplementation. Lipid oxidation increased as storage time increased. Lack of change in phospholipid and neutral lipid fractions during storage indicated that autoxidations was the major cause of oxidation in catfish. Vitamin E levels up to 10 times the normal amount did not improve the overall quality of catfish fillets.
Gaceta Mexicana De Oncologia, May 1, 2009
Scientia agropecuaria, 2011
Resumen Se evaluó el crecimiento de Tetraselmis suecica. El experimento fue realizado aplicando l... more Resumen Se evaluó el crecimiento de Tetraselmis suecica. El experimento fue realizado aplicando la Metodología de Superficie de Respuesta (MSR) con un Diseño Central Compuesto Rotacional (DCCR) con dos factores; pH y concentración sanguaza/agua de mar, en los rangos de 7-9 y 2-5 % (v/v) respectivamente. Los medios de cultivo fueron agitados por burbujeo de aire constante (0.07 L/s) e iluminados de manera continua con luz fluorescente de 40 W en recipientes de vidrio de 1.5 L de capacidad a una temperatura de 22.5 ± 2.1 °C. Se determinó, utilizando el modelo matemático de Gompertz, que a partir de un pH de 8.0 y una concentración de sanguaza/agua de mar de 3.5% se logra el crecimiento máximo de Tetraselmis suecica. Un pH de 8.71 y una concentración de sanguaza/agua de mar de 4.56% permiten obtener un crecimiento máximo (logN/N 0) de Tetraselmis suecica de 0.659, con un error de 12.3% al aplicar un modelo matemático de 2º orden. Los valores obtenidos con el medio de cultivo sanguaza/agua de mar, superaron al medio de cultivo tradicionalmente usado (Guillard F/2 con agua de mar). Los resultados demuestran la potencialidad de uso del medio sanguaza/agua de mar en estudios escalables a nivel piloto de producción de Tetraselmis suecica, con miras a la producción de biodiesel.
Electroencephalography and Clinical Neurophysiology, 1995
In a previous paper, using the same test for the evaluation of reading-writing abilities, Harmony... more In a previous paper, using the same test for the evaluation of reading-writing abilities, Harmony et al. (1990b) reported that children with severe difficulties had more delta in fronto-temporal regions, and this was interpreted as a sign of underlying cerebral dysfunction. Children with severe and minor difficulties in the test had more diffuse theta absolute and relative powers and less alpha relative power. As theta decreases with age, while alpha increases, these results suggested that children with minor and severe difficulties in reading had a maturational lag with respect to those with normal performance. We conducted this study in order to test this hypothesis. Two different EEG records were obtained with an interval of 2.58-3.15 years in 49 children classified in 3 groups according to their performance in a reading-writing test. Group 1: adequate performance for age and degree (control group); group 2: below level performance with minor difficulties; and group 3: below level performance, with severe difficulties. The mean age of the groups in the first study was 9 years. Absolute (AP) and relative powers (RP) in the delta, theta, alpha and beta bands were computed for each session. In general, groups 3 and 2 showed greater changes than group 1 from session to session. ANOVAs performed by session clearly demonstrate many significant differences between groups in the first study, while few significant differences in parieto-occipital regions in theta RP were observed in the second session. These results point toward a maturational spurt of children from groups 2 and 3.
Electroencephalography and Clinical Neurophysiology, 1995
EEG activation patterns during the performance of tasks involving different components of mental ... more EEG activation patterns during the performance of tasks involving different components of mental calculation
Clinical EEG and Neuroscience, 2002
The sources of different EEG frequencies were studied in 25 normal children and 46 learning disab... more The sources of different EEG frequencies were studied in 25 normal children and 46 learning disabled (not otherwise specified) children between 7 and 11 years old. The EEG sources were computed using Frequency-domain Variable Resolution Electromagnetic Tomography which produces a three dimensional picture of the currents at each EEG frequency. Significant differences between groups were observed. LD children showed more theta activity (3.5 to 7.02 Hz) in the frontal lobes and control children more alpha (9.75 to 12.87 Hz) in occipital areas. These results may support the maturational lag hypothesis, as the neurobiological cause of learning deficiencies not otherwise specified.
Haptics Rendering and Applications, 2012
Colombian Journal of Anesthesiology, 2013
ABSTRACT IntroductionNeurogenic bladder predispose to patients with spinal cord injuria to reflex... more ABSTRACT IntroductionNeurogenic bladder predispose to patients with spinal cord injuria to reflex incontinence, urinary tract infections, autonomic dysreflexia and renal failure, which is one of the key causes of mortality. Neuromodulation of the anterior sacral roots is a treatment for bladder dysfunction. The anesthesiology publications about this procedure are very rarely.Objectives To describe the hemodynamic behavior and the adverse events during the intraoperative and immediate postoperative period of patients undergoing implantation of the sacral anterior roots stimulator.Methods Retrospective, descriptive study of series of cases of patients with chronic spinal cord trauma implanted with the anterior sacral roots stimulator.ResultsOut of 50 patients studied, 34% had an upper chest injury, 58% had a spinal injury secondary to a fire weapon bullet, 40% had a history of autonomic dysreflexia, 98% were had arterial line monitoring, 90% of the patients were hypotensive and 86% required vasopressors; 34% experienced bradycardia and 88% required atropine management.Conclusions Hypotension and bradycardia are the major adverse events in the management of these patients, but they exhibit adequate response to medical treatment. Studies are needed to assess the association between the level of the injury versus the presence of bradycardia and hypotension and the ideal monitoring during the procedure.ResumenIntroducciónLa vejiga neurogénica predispone a los pacientes con traumatismo raquimedular a incontinencia refleja, infecciones del tracto urinario, disreflexia autonómica y fallo renal, el cual es una de las principales causas de mortalidad. La neuromodulación de las raíces sacras anteriores es un tratamiento de la disfunción vesical. Es raro encontrar publicaciones en anestesiología sobre este procedimiento.ObjetivosDescribir el comportamiento hemodinámico y los efectos adversos durante el intraoperatorio y post-operatorio inmediato en los pacientes que han recibido implantación de estimulador de raíces sacras anteriores.MétodosEstudio descriptivo retrospectivo de pacientes con trauma- tismo raquimedular crónico que han recibido implantación de estimulador de raíces sacras anteriores.ResultadosDe 50 pacientes estudiados, el 34% tenían lesión torácica alta, un 58% tenía lesión espinal secundaria a herida por proyectil de arma de fuego, el 40% con antecedente de disreflexia autonómica, el 98% empleo de monitoría con línea arterial, el 90% de los pacientes presentó hipotensión y el 86% requirió manejo vasopresor, el 34% presentó bradicardia y el 88% requirió manejo con atropina.ConclusionesLa hipotensión y la bradicardia son los principales efectos adversos durante el manejo de estos pacientes pero con adecuada respuesta al tratamiento médico. Se deben realizar estudios que evalúen la asociación entre nivel de la lesión con bradicardia e hipotensión y la monitorización ideal durante este procedimiento.
Revista médica de Chile, 2005
Prevalence of antibiotic resistant Enterococcus spp in waste waters in the north of Chile Backgro... more Prevalence of antibiotic resistant Enterococcus spp in waste waters in the north of Chile Background: There is little information available in Chile on the distribution of Enterococcus spp in waste water and its implications in transmission of antibiotic resistance through the water cycle. Enterococcus spp are common in nosocomial infections and may spread antibiotic resistance through the food chain. Aim: To determine the presence of antibiotic resistant Enterococcus spp in the sewage of Antofagasta, Chile. Material and Methods: Samples of sewage from two sewage treatment plants and from the Public Hospital of Antofagasta collector were obtained. Enterococcus spp were isolated on m-Enterococcus agar containing ampicillin, vancomycin and streptomycin. The isolates were identified and subjected to biochemical typing (PhPlate). Minimal inhibitory concentration determination was performed by agar dilution technique. Results: High counts of resistant Enterococcus spp were found on the streptomycin plates, lower on ampicillin and very low on vancomycin plates. A total of 63 Enterococcus spp strains were typed and the identification showed 5 different species; E faecalis (65%), E faecium (14%), E hirae (13%), E durans (6%) and E gallinarum (2%). The typing revealed a high diversity among the isolates. Two biochemical phenotypes were predominant, C1 (21 strains) and C6 (7 strains). Both were highly resistant to gentamycin and streptomycin; moderately resistant to ampicillin, cloramphenicol, tetracycline and ciprofloxacin, and with intermediate susceptibility to vancomycin. Both phenotypes were found in the sewage of the hospital collector and in the treatment plants. Conclusions: In the sewage of Antofagasta we found dominating phenotypes of multiresistant Enterococcus spp. Sewage could be an important way of transmission of these microorganisms (
Survey of Ophthalmology, 2012
We review what is known in each country of the Latin American region with regards to blindness an... more We review what is known in each country of the Latin American region with regards to blindness and visual impairment and make some comparisons to Hispanic populations in the United States. Prevalence of blindness varied from 1.1% in Argentina to 4.1% in Guatemala in people 50 years of age and older, with the major cause being cataract. Diabetic retinopathy and glaucoma are starting to make serious inroads, although epidemiological data are limited, and age-related macular degeneration is now a concern in some populations. Infectious diseases such as trachoma and onchocerciasis are quickly diminishing. Although progress has been made, retinopathy of prematurity remains the major cause of childhood blindness. If VISION 2020 is to succeed, many more epidemiological studies will be needed to set priorities, although some can be of the Rapid Assessment of Avoidable Blindness design. Developing the infrastructure for screening and treatment of ophthalmic disease in Latin America continues to be a challenge.
Journal of Rapid Methods and Automation in Microbiology, 2003
Whole (deheaded and eviscerated) channel catfish were dipped in 1 or 2 % lactic acid or sodium pe... more Whole (deheaded and eviscerated) channel catfish were dipped in 1 or 2 % lactic acid or sodium percarbonate (Pergenox 7. Whole and fillets were also washed with high-pressure water or 8% sodium tripolyphosphate (STPP). Impedance detection time (IDT) was recorded for rinsates of the products. Fish dipped in 2 % lactic acid had higher initial IDT than those dipped in 1 95 lactic acid. Regardless of lactic acid concentration, IDT were the same in products held more than one day at 4C. Similar results were achieved forproducts dipped in Pergenox ' ? Fillets spray-washed in STPP had higher IDT than those dipped or spray-washed with water; the difference being pronounced after six days at 4C. For whole fish, STPP had a very significant initial reduction in microbial counts (higher IDT). Exposing the product to high-pressure spray wash for a short time did not have a signQicant effect on IDT, but the addition of STPP in the water did increase IDT, thus shelf-life.
International Journal of Psychophysiology, 1998
Recent studies have suggested that anxiety disorders such as animal phobias are mediated not only... more Recent studies have suggested that anxiety disorders such as animal phobias are mediated not only by fear but also by
International Journal of Food Microbiology, 2010
Starch-based films impregnated with fresh tannic acid (FTA/starch film) and thermally processed t... more Starch-based films impregnated with fresh tannic acid (FTA/starch film) and thermally processed tannic acid (PTA/starch film) were assessed for inhibition of Escherichia coli O157:H7 and Listeria monocytogenes. Disc-diffusion assay revealed that the PTA/starch film showed larger clear zone around the film on the bacterial lawn than the FTA/starch film at the same tannic acid concentrations (0.45 to 4.5 mg per disc). Viable cell count assays in tryptic soy broth showed that the PTA/starch film also had a stronger antimicrobial activity on these foodborne pathogens than the FTA/starch film. L. monocytogenes did not replicate in trypic soy broth containing the FTA/starch film for the first 8 h but multiplied up to 9.22 log CFU/ml at 48 h of incubation. The PTA/starch film caused a 2.72-log decrease in L. monocytogenes cells over the same time period. While 5-log E. coli O157:H7 cells were inactivated by the FTA/starch film within 48 h, more than 7-log E. coli O157:H7 cells were killed by the PTA/starch film over the same period. The antimicrobial activity of FTA/starch and PTA/starch film was primarily pH independent. HPLC measurement of the FTA or PTA release from starch film in water revealed that their release kinetic curves were in well match with their inactivation curves for E. coli O157:H7 and L. monocytogenes in 0.1% peptone water. In addition to antimicrobial activity, FTA showed antioxidant activity on soybean oil by doubling the induction time of oil oxidation. PTA further enhanced the oxidative stability of the oil by 17%. These results suggested that the use of processed tannic acid in starch films could improve the safety and quality of foods.
Clinical & Experimental Ophthalmology, 2012
Background: To determine if gender inequities exist in Latin America in regard to cataract surger... more Background: To determine if gender inequities exist in Latin America in regard to cataract surgery. Design: Meta-analysis. Participants: Total of 38 992 subjects participating in epidemiological surveys; summary measures were used (not patient-level data). Methods: A literature search and knowledge of rapid assessment of cataract surgical services/rapid assessment of avoidable blindness studies carried out in Latin America found 11 studies with complete cataract surgical coverage (CSC) data. Using summary original study data, a meta-analysis (random effects model) was conducted to analyse the differences in CSC between males and females. Results were adjusted for design effect. Main Outcome Measures: Odds ratio (OR) of receiving cataract surgery comparing women with men. Results: CSC with a visual acuity (VA) <3/60 on an eye basis showed a non-statistically significant OR of 1.01 (95% confidence intervals [CI]: 0.86-1.18) for women receiving cataract surgery in comparison with men. For VA < 6/18, a non-statistically significant OR of 0.94 (95% CI: 0.83-1.07) was obtained for women receiving cataract surgery. On a person basis at a VA of <3/60 and <6/18, non-statistically significant ORs of 1.12 (95% CI: 0.78-1.63) and 0.94 (95% CI: 0.77-1.15) were obtained for women receiving cataract surgery, respectively. Statistical heterogeneity was 0% (I 2 statistic), except for results at a VA of <3/60 on a person basis (I 2 = 30%). Conclusions: In the Latin American countries in which CSC was assessed, gender does not appear to be a significant factor in receiving cataract surgery. However, more data are required to confirm these results.
British Journal of Ophthalmology, 2014
Objective To present regional estimates of the magnitude and temporal trends in the prevalence an... more Objective To present regional estimates of the magnitude and temporal trends in the prevalence and causes of blindness and moderate/severe visual impairment (MSVI) in Latin America and the Caribbean (LAC). Methods A systematic review of cross-sectional population-representative data from published literature and unpublished studies was accessed and extracted to model the estimated prevalence of vision loss by region, country and globally, and the attributable cause fraction by region. Results In the LAC combined region, estimated all-age both-gender age-standardised prevalence of blindness halved from 0.8% (0.6 to 1.1) in 1990 to 0.4% (0.4 to 0.6) in 2010 and MSVI decreased from 4.3% (3.1 to 5.3) to 2.7% (2.2 to 3.4). In the Caribbean, estimated all-age both-gender age-standardised prevalence of blindness decreased from 0.6% (0.4 to 0.8) in 1990 to 0.5% (0.4 to 0.6) in 2010 and MSVI decreased from 3.3% (1.3 to 4.1) in 1990 to 2.9% (1.8 to 3.8). In the LAC regions combined, there was an estimated 2.3 million blind and 14.1 million with MSVI in 2010. In 2010, cataract continues to contribute the largest proportion of blindness, except in Southern Latin America where macular degeneration is most common. In 2010, uncorrected refractive error was the most common cause of MSVI. Conclusions While models suggest a decrease in agestandardised prevalence estimates, better data are needed to evaluate the disparities in the region. The increasing numbers of older people, coupled with the increase in vision loss associated with older age, will require further intervention to continue to reduce prevalence rates and to prevent a rise in absolute numbers of blind.