103 research outputs found
Rodolfo Devera
No full textAnimar a Rodolfo a terminar su reseña fue muy interesante. Él confiesa que la primera vez que pensó en escribir su biografía fue al cumplir los 50 años, en el 2018, pero sumido en múltiples ocupaciones y sorteando los avatares de la crisis del país lo apartaron rápidamente de la idea. Luego llegó la pandemia que como a muchos, le dio perspectiva, pero no terminó de escribirla. Transcurrieron algunos años y en el 2023, a propósito de una intervención quirúrgica a la que fue sometido, reconoce que “solo ante eventos relacionados con la vida y la muerte es que pensamos cual ha sido tu obra, qué dejamos después de desaparecer y lo más importante que tu obra sea palpable (por escrito) para que las futuras generaciones recuerden tus contribuciones”. Es así como luego de algunos meses intentando escribir sus datos para esta reseña y luego de desechar varias ideas de las muchas que se le ocurrieron, aquí estamos, agradecidos de que Rodolfo, quien obviamente se conoce mejor que nadie, nos permita ahora conocer un trocito de su extensa, brillante y muy interesante vida profesional
Solving problems from the domain of electrical circuits
No full textTITLE: Solving problems from the domain of electrical circuits AUTHOR: Filip Devera DEPARTMENT: Department of Mathematics and Mathematical Education SUPERVISOR: Prof. RNDr. Jarmila Novotná, CSc. ABSTRACT: The subject of this thesis is solving problem from the domain of electrical circuits. Because the theory of electrical circuits itself is a broad subject, this thesis is going to focus only on a small subcategory, mainly electrical circuits, where the power sources supply the current and voltage either at a constant direct flow or with a harmonic waveform. Furthermore these circuits will be discussed only in their stabilized state. This may seem as a gross simplification of the subject, but majority of electronic devices works with direct or harmonic power supply. The goal set for this thesis is to define relationships for the design of selected electrical circuits derived from the much broader theory of electromagnetic field. Various methodologies and procedures for the design of electronic ci- rcuits exist, that are based on these relationships. These methods will be illustrated on solved examples. Aside from the physical characterization of circuits a mathematical apparatus will be needed to solve equations and sys- tem of equations, derived from the physical relationships
Solving problems from the domain of electrical circuits
Get PDFTITLE: Solving problems from the domain of electrical circuits AUTHOR: Filip Devera DEPARTMENT: Department of Mathematics and Mathematical Education SUPERVISOR: Prof. RNDr. Jarmila Novotná, CSc. ABSTRACT: The subject of this thesis is solving problem from the domain of electrical circuits. Because the theory of electrical circuits itself is a broad subject, this thesis is going to focus only on a small subcategory, mainly electrical circuits, where the power sources supply the current and voltage either at a constant direct flow or with a harmonic waveform. Furthermore these circuits will be discussed only in their stabilized state. This may seem as a gross simplification of the subject, but majority of electronic devices works with direct or harmonic power supply. The goal set for this thesis is to define relationships for the design of selected electrical circuits derived from the much broader theory of electromagnetic field. Various methodologies and procedures for the design of electronic ci- rcuits exist, that are based on these relationships. These methods will be illustrated on solved examples. Aside from the physical characterization of circuits a mathematical apparatus will be needed to solve equations and sys- tem of equations, derived from the physical relationships
100 AÑOS DEL DESCUBRIMIENTO DE LA ENFERMEDAD DE CHAGAS
No full textEn abril de 1909, Carlos Chagas (1879-1934), investigador del Instituto Oswaldo Cruz (antes llamado Instituto Manguihos), comunicó al mundo científico el descubrimiento de una nueva enfermedad humana. Chagas identificó el agente causal (Trypanosoma cruzi) y el insecto transmisor. La “triple descubierta” de Chagas, es considerada única en la historia de la medicina, constituye un marco en la historia de la ciencia y la salud brasileñas y latinoamericana. En este trabajo se revisan los aspectos históricos del descubrimiento, la vida de Carlos Chagas y algunos puntos de la historia de la enfermedad en Venezuela. PALABRAS CLAVE: Enfermedad de Chagas, Trypanosoma cruzi, historia. ABSTRACT In April 1909, Carlos Chagas (1878-1934) a researcher at the Oswaldo Cruz Institute (formerly The Manguiñhos Institute), announced the discovery of a new human disease to the scientific world. Chagas identified its causal agent (Trypanosoma cruzi) and the insect vector. Chagas’ “triple discovery” is considered to be unique in the history of medicine and represents a milestone in the history of Brazilian and Latin American science and health. In this study we revise the historic aspects of the discovery, the life of Carlos Chagas and some keypoints in the history of Chagas Disease in Venezuela. KEY WORDS: Chagas disease, Trypanosoma cruzi, history
PAR\uc1SITOS INTESTINALES EN HABITANTES DE LA COMUNIDAD RURAL "LA CANOA", ESTADO ANZO\uc1TEGUI, VENEZUELA
No full textEn febrero de 2013 se realiz\uf3 un estudio transversal para determinar la prevalencia de par\ue1sitos intestinales en habitantes de la comunidad rural "La Canoa" al sur del estado Anzo\ue1tegui. Se realiz\uf3 un muestreo no probabil\uedstico y voluntario. Las muestras fecales obtenidas por evacuaci\uf3n espont\ue1nea fueron analizadas mediante las t\ue9cnicas de examen directo, Kato, sedimentaci\uf3n espont\ue1nea y coloraci\uf3n de Kinyoun. Para el an\ue1lisis estad\uedstico de los datos se us\uf3 la prueba Ji al cuadrado (c2) con un margen de seguridad de 95%, para demostrar la independencia entre las variables estudiadas. De los 158 habitantes evaluados, 95 resultaron parasitados para una prevalencia de 60,1%. Seg\ufan la edad, todos los grupos fueron afectados sin diferencias estad\uedsticamente significativas (?2=3D 8,13 g.l.: 5 p>0,05). Ambos g\ue9neros resultaron parasitados por igual (p>0,05). Se observ\uf3 46,3% de poliparasitismo y 53,7% de monoparasitismo. Ocho especies de enteropar\ue1sitos fueron diagnosticados, siendo los protozoarios (98,9%) m\ue1s prevalentes que los helmintos (1,1%). De los protozoarios, Blastocystis spp. fue el par\ue1sito m\ue1s prevalente con 51,3%. Llam\uf3 la atenci\uf3n el hallazgo de un caso (0,6%) del complejo Entamoeba histolytica/E. dispar/ E. moshkovskii. Igualmente, cabe destacar el diagn\uf3stico de dos casos (1,3%) de Cryptosporidium spp. Hymenolepis nana fue el \ufanico helminto encontrado (0,6%). Las asociaciones m\ue1s comunes fueron Blastocystis spp.-Endolimax nana con 13 casos (29,5%) y Blastocystis spp.-Entamoeba coli con 12 casos (25%). En conclusi\uf3n, se determin\uf3 una elevada prevalencia de par\ue1sitos intestinales (60,1%) en la comunidad rural "La Canoa" del estado Anzo\ue1tegui.
ABSTRACT
INTESTINAL PARASITES IN RESIDENTS FROM "LA CANOA" RURAL COMMUNITY,
ANZO\uc1TEGUI STATE, VENEZUELA
In February 2013 a cross-sectional study was conducted to determine the prevalence of intestinal parasites in residents from "La Canoa" rural community, located in the south of Anzo\ue1tegui state. Voluntary and non-probability sampling was used. Stool samples obtained by spontaneous evacuation were analyzed by direct examination techniques, Kato, spontaneous sedimentation and Kinyoun staining. For statistical data analysis Chi-square test was used (c2) with a safety margin of 95% to demonstrate the independence between the variables studied. Of the 158 people evaluated, 95 were parasitized for a prevalence of intestinal parasites of 60.1%. According to age, all groups were affected without statistically significant difference (?2 =3D 8.13 df: 5 p > 0.05). Both genders were equally parasitized (p> 0.05). 46.3 % had polyparasitism and 53.7 % was infected by one only parasite. Eight species of enteroparasites were diagnosed being protozoa (98.9%) more prevalent than helminths (1.1%). Between the protozoa, Blastocystis spp. was the most prevalent parasite with 51.3 %. Attention ws directed to the finding of one case (0.6%) of Entamoeba histolytica /E. dispar/E. moshkovskii complex. Equally noteworthy was the diagnosis of two cases (1.3%) of Cryptosporidium spp. Hymenolepis nana was the only helminth found (0.6%). The most common associations were Blastocystis spp.-Endolimax nana with 13 cases (29.5%) and Blastocystis spp.-Entamoeba coli with 12 cases (25%). To conclude, a high prevalence of intestinal parasites (60.1%) in the "La Canoa" rural community from Anzo\ue1tegui state was determined
Aislamiento de huevos y larvas de toxocara spp. y otros geohelmintos en suelos de parques de un colegio de ciudad Bolívar, estado Bolívar, Venezuela / Isolation of eggs and larvae of toxocara spp. and other helminthes transmitted by soil in parks of a school from ciudad Bolivar, state Bolivar, Venezuela
Get PDFResumenSe realizó un estudio para determinar la presencia de huevos de Toxocara spp. y otros helmintos en losparques infantiles de un colegio privado de Ciudad Bolívar, estado Bolívar, Venezuela. De cada parque se tomaronmuestras de suelo que fueron analizadas mediante las técnicas de flotación en solución salina saturada de Willis ysedimentación espontánea. Se estudiaron 16 muestras de suelo (8 del parque de escuela primaria y 8 del parque deeducación inicial), en ocho (50%) de las cuales se registró la presencia de huevos o larvas de helmintos. Ademásde la presencia de huevos de Toxocara spp. en 5 de las muestras (31,2%), se encontró una con anquilostomideos(6,2%), otra con Ascaris spp. (6,2%) y cuatro (25%) donde se observaron larvas rhabditoides de Strongyloides spp.En conclusión, existe un riesgo potencial de transmisión de zoonosis causadas por helmintos de animales, debidoal elevado porcentaje de muestras de suelo con huevos de Toxocara spp. en los parques del colegio evaluado.Palabras clave: Toxocara, geohelmintos, solis, parques, Venezuela.ABSTRACTA study was conducted to determine the presence of Toxocara spp. and other helminthes in the playgroundof a private school in Ciudad Bolivar, Bolivar state, Venezuela. Samples of soil were taken from the playgroundsand were analyzed by Willis and spontaneous sedimentation techniques. A total of 16 soil samples (8 from theelementary school playground and 8 from the Kindergarten playground) was obtained, and in eight of them (50%)helminth eggs or larvae were observed. Along with the presence of Toxocara spp. in five samples (31.2%), asample with hookworms (6.2%), another with Ascaris spp. (6.2%) and four (25%) with rhabditoides larvae ofStrongyloides spp. were detected. In conclusion, there is a potential risk of transmission of infectious diseasescaused by helminthes of animals due to the high percentage of Toxocara spp. in the soil of the playgroundsevaluated.Key words: Toxocara, soil-transmitted helminths, suelos, park, Venezuela
PAR\uc1SITOS INTESTINALES EN UNA COMUNIDAD SUBURBANA DE CIUDAD BOL\ucdVAR, ESTADO BOL\ucdVAR, VENEZUELA
No full textSe evaluaron 168 habitantes la comunidad suburbana "Gran Sabana" del estado Bol\uedvar para determinar la prevalencia de par\ue1sitos intestinales. Una muestra fecal obtenida de cada persona fue analizada mediante las t\ue9cnicas de examen directo, Kato, sedimentaci\uf3n espont\ue1nea y coloraci\uf3n de Kinyoun. La prevalencia de par\ue1sitos intestinales fue de 79,6%.
No hubo diferencias con relaci\uf3n a la edad y el sexo de los parasitados. Se diagnosticaron 12 especies de enteropar\ue1sitos. Los protozoarios (97,2%) resultaron m\ue1s frecuentes que los helmintos. Blastocystis sp. fue el parasito m\ue1s prevalente (64,9%). El 61,2% de los infectados estaban poliparasitados (82/134). Las asociaciones parasitarias m\ue1s comunes
fueron Blastocystis sp./ Giardia intestinalis (12,5%), Blastocystis sp./ Entamoeba coli
(12,5%) y Blastocystis sp./ Endolimax nana (11,0%). En conclusi\uf3n, se determin\uf3 una
elevada prevalencia de par\ue1sitos intestinales entre los habitantes de la comunidad suburbana
"Gran Sabana" del estado Bol\uedvar.
ABSTRACT
INTESTINAL PARASITES IN SUBURBAN COMMUNITY OF CIUDAD BOLIVAR, BOLIVAR STATE, VENEZUELA
To determine the prevalence of enteroparasites infection in "Gran Sabana", a suburban
community of Bolivar State, 168 inhabitants were evaluated. A fecal sample was obtained
from each person and analyzed by direct examination, Kato method, spontaneous
sedimentation and Kinyoun staining. The prevalence of intestinal parasites was 79.6%. No
differences in age (p > 0.05) or sexes (p > 0.05) were observed among individuals parasited.
Twelve species of enteroparasites were diagnosed. Protozoans (97.2%) were more frequent
than helminthes. Blastocystys sp. was the most prevalent parasite (64.9%). 61.2% of infected
was poliparasited (82/134). The parasitic associations most common were: Blastocystys sp./
Giardia intestinalis (12.5%), Blastocystys sp./ Entamoeba coli (12.5%) and Blastocystys
sp./ Endolimax nana (11.0%). We conclude that the prevalence of enteroparasites was high
among inhabitants in the suburban community of "Gran Sabana" in Bolivar Sate
Balantidiosis: algunas notas históricas y epidemiológicas en América Latina con especial referencia a Venezuela | Balantidiosis: some historical and epidemiological notes in Latin America with special reference to Venezuela
No full textLa balantidiosis es una zoonosis parasitaria causada por Balantidium coli. Es el único protozoario ciliado que se ha encontrado infectando al hombre, principalmente en el intestino grueso y su transmisión es por vía fecal-oral a partir de las heces del hospedador infectado. En este artículo se revisan la epidemiología y la historia de la balantidiosis en América Latina con especial énfasis en Venezuela.ABSTRACTBalantidiasis is a parasitic zoonosis caused by Balantidium coli. It is the only ciliate protozoan that has been found to infect man, mainly in the large intestine and it is fecal-orally transmitted from the stool of the infected host. In this paper we review the epidemiology and history of balantidiasis in Latin America with particular emphasis on Venezuela
PEDICULOSIS CAPITIS EN HABITANTES DE UNA COMUNIDAD IND\ucdGENA DEL ESTADO BOL\ucdVAR, VENEZUELA.
No full textLa pediculosis capitis es producida por Pediculus capitis, un insecto \ue1ptero que se ha especializado a vivir en el cuero cabelludo humano. Esta ectoparasitosis sigue siendo com\ufan en la actualidad especialmente en ni\uf1os en edad escolar y con deficiencias sociosanitarias. El objetivo de este estudio de tipo transversal, realizado en junio de 2014, fue determinar la prevalencia de pediculosis capitis en habitantes de la comunidad ind\uedgena Itopoicon, estado Bol\uedvar, Venezuela. Previa firma del consentimiento informado, a cada participante se le llen\uf3 una ficha cl\uednico-epidemiol\uf3gica y se le realiz\uf3 un examen del pelo y cuero cabelludo. El diagn\uf3stico parasitol\uf3gico se realiz\uf3 por observaci\uf3n directa de huevos, ninfas y adultos sobre el cuero cabelludo y/o pelo de la persona. Se evaluaron 170 individuos, determin\ue1ndose una prevalencia de 10,6% (18/170). El g\ue9nero femenino result\uf3 m\ue1s afectado (p0,05). Los factores asociados a una mayor prevalencia de pediculosis fueron, adem\ue1s del g\ue9nero femenino, el tener el pelo largo, el haber tenido pediculosis previamente y vivir en hacinamiento. En conclusi\uf3n, se determin\uf3 una prevalencia de pediculosis capitis de 10,6% con predominio de las mujeres con pelo largo y que viv\uedan en hacinamiento. Se requieren implementar campa\uf1as de tratamiento y prevenci\uf3n en esta comunidad que constituye un grupo socialmente vulnerable.
Palabras claves del Autor: infestaci\uf3n por piojos, Pediculus capitis, poblaci\uf3n ind\uedgena
PEDICULOSIS CAPITIS IN AN INDIGENOUS POPULATION, BOLIVAR STATE, VENEZUELA
ABSTRACT
Pediculosis capitis is caused by Pediculus capitis, wingless insect that is specialized to live on the human scalp. This ectoparasitosis remains common today especially in children of school age and with socio sanitary deficiencies. The aim of this cross-sectional study, conducted in June 2014, was to determine the prevalence of head lice in people of the indigenous community Itopoicon, Bol\uedvar State, Venezuela. After signing the informed consent, each participant filled a clinical epidemiological record and underwent an examination of the hair and scalp. The parasitological diagnosis was made by direct observation of eggs, nymphs and adults on the scalp and / or hair of the person. 170 individuals were evaluated, determining a prevalence of 10.6% (18/170). Female gender was more affected (p 0.05). Factors associated with a higher prevalence of pediculosis capitis were also the female gender, having long hair, previously having had lice and live in overcrowded. In conclusion, we determined a prevalence of head lice of 10.6%. It was most common in women with long hair and living in overcrowding. It is required to implement treatment and prevention campaigns in this community which is a socially vulnerable group.
Key words: head lice, Pediculus capitis, Indigenous population<br
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