Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

4 ( 1 )

2020 ( 85 )

2019 ( 475 )

2018 ( 558 )

Custom range...

Search Results: 1 - 10 of 340535 matches for " Jesús; Andrade-Rocha "
All listed articles are free for downloading (OA Articles)
Page 1 /340535
Display every page Item
Parámetros seminales en hombre fértiles de dos poblaciones suramericanas
Berdugo,Jesús; Andrade-Rocha,Fernando; Cardona-Maya,Walter;
Archivos Espa?oles de Urología (Ed. impresa) , 2009, DOI: 10.4321/S0004-06142009000800006
Abstract: objectives: this retrospective study compared semen parameters from fertile men of two south american cities (medellín-colombia and petrópolis-brazil) to investigate their differences in some semen parameters. methods: we evaluated semen volume using a graduated tube, total progressive motility (a + b) using light microscopy (40x) and sperm concentration using a neubauer counting chamber. results: we observed that fertile men from medellín presented a significantly lower volume (p<0.0001), whereas individuals from petrópolis presented a significantly lower percentage of total progressive motility (p<0.0001). on the other hand, no difference was found in sperm concentration (p>0.05). conclusions: in conclusion, this study showed differences in semen parameters between fertile men of these south american populations. we think that these differences could be attributed to the geographical variations, like those observed in other countries. however, new studies are required to investigate this phenomenon and their causes.
Significance of sperm characteristics in the evaluation of adolescents, adults and older men with varicocele
Andrade-Rocha F
Journal of Postgraduate Medicine , 2007,
Abstract: Background: No reports have been published about age-related sperm malformations in varicocele patients. Aim: To investigate the distribution of abnormal sperm characteristics in adolescents, adults and older men with varicocele. Setting and Design: Records of semen analysis of 143 men aged 14 to 53 years who had evident left-sided varicocele detected by physical examination and confirmed by doppler sonography were selected. Materials and Methods: Sperm concentration, vitality, motility, morphology, hypoosmotic swelling test (HOST) and morphology were measured in adolescent males aged 14 to 20 years (n=31), men 21 to 30 years (n=48), 31 to 40 years (n=40) and older men over 40 (n=24) and compared with a control group of fertile men with no varicocele (n=27) and with a group of infertile men with varicocele (n=26). Statistical Analysis: One-way analysis of variance and the Kruskal-Wallis test were used to compare varicocele groups. Comparisons with the control group and infertile group were performed using the unpaired t-test and the Mann-Whitney test. The discriminating ability of significant sperm characteristics in evaluating the sperm quality of varicocele men was also analyzed using receiver operating characteristics curve to select the cut-off level providing the best combination of sensitivity and specificity. Results: Varicocele men displayed similar impairment of vitality, motility and HOST. Sperm morphology analysis revealed a prevalence of small head, slightly and severely amorphous head and particularly combined anomalies in the study groups. Sperm concentration fell within the normal range of the World Health Organization manual. Differences were not significant between the study groups and when compared with infertile group ( P >0.005). However, a comparative study of the varicocele groups and the infertile group with the control group revealed significant differences in sperm vitality, motility, HOST, morphologically normal sperm, pin-headed, tapered and combined anomalies. Morphologically normal sperm and combined anomalies showed higher accuracy in identifying poor sperm quality in varicocele men (83.7% and 77.9%, at cut-off levels of 9% and 38%, respectively). Conclusions: Varicocele harms equally the sperm characteristics of adolescents, adults and older men. Apparently, it affects sperm quality more adversely than it does sperm production.
Assessment of Increased Desquamation of Epididymal Epithelial Cells in Semen of Men as a Predictor of Acute Epididymitis
Fernando Tadeu Andrade-Rocha
Urology Journal , 2011,
Características gerais dos espermatozóides em homens varicocele clínica
Andrade-Rocha, F.T.;Carvalho, P.P.N.G. de;
Revista da Associa??o Médica Brasileira , 1997, DOI: 10.1590/S0104-42301997000100013
Abstract: patients with oligozoospermia show a reduction in the semen quality, independent of the etiology of the disturbance. purpose - to investigate the role of the varicocele in the decrease of the semen quality in oligozoospermic men. methods - ten patients with left clinical varicocele (termed pcv) and 21 patients without this entity (termed psv) attended in a private laboratory from petrópolis, rj, were investigated. sperm count, vitality, motility, and morphology of spermatozoa were examined and the results were compared between them and a control group consisting of 15 patients without clinical varicocele and with normal spermiogram. results - pcv and psv had showed significant decrease in the vitality (43.9% and 34.9% versus 73.0% in the control group), grade (a) (5.3% and 2.4% versus 32.4%) and grade (d) (76.7% and 83.8% versus 44.9%) of sperm progression and in the percentage of oval sperms (25.5% and 22.9% versus 61.2%), amorphous head (25.4% and 23.8% versus 12.5%) and other anomalies (23.8% and 30.5% versus 13.0%). pcv had also showed significant difference in the percentage of tapered sperm (10.9% versus 1.3%), whereas psv had showed significant difference in the grade (b) of sperm motility (11.0% versus 22.0%), both in regard to the control group. between pcv and psv had not been found significant differences. conclusion - varicocele reduces the semen quality in oligozoospermic men, but this reduction also occurs in oligozoospermia of any etiology.
Características gerais dos espermatozóides em homens varicocele clínica
Andrade-Rocha F.T.,Carvalho P.P.N.G. de
Revista da Associa??o Médica Brasileira , 1997,
Abstract: Pacientes com oligozoospermia apresentam uma redu o na qualidade do sêmen, independente da etiologia do distúrbio. OBJETIVO. Investigar o papel da varicocele na redu o da qualidade do sêmen, em homens oligozoospérmicos. MéTODOS. Foram estudados dez pacientes portadores de varicocele clínica esquerda (PCV) e 21 pacientes n o-portadores desta entidade (PSV), atendidos em um laboratório privado, em Petrópolis, RJ. Foram analisados os seguintes parametros seminais: contagem de espermatozóides, vitalidade, motilidade e morfologia espermática. PCV e PSV foram comparados entre si e com um grupo-controle (n=15) de pacientes sem varicocele clínica e com espermograma normal. RESULTADOS. PCV e PSV apresentaram uma redu o significativa na vitalidade (43,9% e 34,9% versus 73,0% no grupo-controle), nos graus (a) (5,3% e 2,4% versus 32,4 %) e (d) (76,7% e 83,8% versus 44,9%) de progress o espermática e nos percentuais de espermatozóides ovais (25,5% e 22,9% versus 61,2%), amorfos (25,4% e 23,8% versus 12,5%) e outras anomalias (23,8% e 30,5% versus 13,0%). PCV ainda apresentou diferen a significativa no percentual de espermatozóides fusiformes (10,9% versus 1,3%) e PSV no grau (b) de progress o espermática (11,0% versus 22,0%), em rela o ao grupo-controle. Entre PCV e PSV, n o foram encontradas diferen as significativas. CONCLUS O. A varicocele reduz a qualidade de semens oligozoospérmicos, mas esta redu o também ocorre em oligozoospermias de outras etiologias.
Educación y tecnologías de información: Herramientas contra la pobreza en Venezuela
Andrade,Jesús Alberto;
Educere , 2009,
Abstract: this paper does an interpretative analysis of the topic of citizen inclusion through information technologies (its) aiming to understand how participation degrees of its in the venezuelan population are evaluated. the premise is that education is held on an ideological baggage that represents an elitist notion, since it excludes a good part of human beings, and today, is still associated to technological determinism that separates any responsibility that we may have in the creation of a new model of society. some of the policies? features that have been used aiming to exclude masses of human beings that have not had access to education, based on an ideological conception that denies people?s participation in social wellbeing. last, an analytical diagnose of the current state if its in venezuela is done in the search of incorporating citizens in higher educational levels, to then make some definite suggestions to reach better and higher levels of citizen incorporation based on digital features.
Structuration to research in information systems
Andrade,Jesús Alberto;
Opción , 2007,
Abstract: information and communications technologies cannot be studied in isolation from their social contexts. structuration is a theory that has been in the information systems field; it might be a promising avenue to better understand how technologies interact within organizations. because technology and information systems cannot usefully be studied in isolation from their social contexts, this paper analyzes how giddens? structuration theory is used to offer a theoretical understanding between technology and information systems, and organizational structure and social practices. the idea being that social systems and information systems and technologies are structures that adapt well to strengthen the role of human beings as actors within the organizations.
Structuration to research in information systems
Jesús Alberto Andrade
Opción , 2007,
Abstract: Las tecnologías de la información y de las comunicaciones no pueden ser estudiadas solo pensando en la utilidad que puedan reportar, independientemente del contexto social. La Estructuración es una teoría que ha sido poco usada en el campo de los sistemas de información; sin embargo, ella puede ser un promisorio camino para entender mejor cómo las tecnologías interactúan en las organizaciones. Debido a que las tecnologías y sistemas de información no pueden ser estudiados separadamente del contexto social, este trabajo analiza cómo la Teoría de la Estructuración formulada por Giddens es usada para ofrecer un entendimiento teórico entre tecnología y sistemas de información con las estructuras organizacionales y las prácticas sociales. Esta idea equivale a decir que los sistemas sociales y los sistemas y tecnologías de información son estructuras que se ajustan bien para fortalecer el rol del ser humano como actores en las organizaciones.
Crisis de las revistas científicas
Jesús Alberto Andrade
Opción , 2009,
Jesús Alberto Andrade
Enlace , 2010,
Abstract: Desde su primera aparición, Enl@ce ha servido como vehículo de difusión de investigacionesrelacionadas con tecnologías de información, cambio social, y políticas de información.Enl@ce es una contribución académica no sólo a la investigación de temas asociados a lainformación, sino que es una contribución a la comprensión y al diálogo entre investigadores delas ciencias de la computación, informática e investigadores de las ciencias sociales con los entesoficiales y gubernamentales venezolanos. Creemos que con ello, nuestra revista contribuye al conocimientode la Sociedad de la Información desde la mirada venezolana; pero también hemos abiertola puerta a trabajos realizados en otros países de habla castellana y que cada día ven en Enl@ce unaopción seria para publicar.Hoy en día, la mayoría de los artículos publicados se sustentan en un entusiasmo generalizadopor el desarrollo de la tecnología y su impacto en la Sociedad de la Información, al tratar problemasrelacionados con las distintas políticas y fuerzas sociales que impiden o promueven el ampliouso de tecnologías de la información.Investigaciones que analizan los problemas sociales de la informatización y el papel democratizadorde las tecnologías en una sociedad que se sustenta en el uso de información han servidode foco central de un gran debate, acerca de la posibilidad que el uso de sistemas informáticos debilitala participación democrática de quienes tienen acceso al conocimiento y, por lo tanto, exigen laformulación de políticas públicas para la libre apropiación tecnológica de la información.La revista incluye trabajos relacionados no sólo con el análisis de las políticas tecnológicasque deberían ponerse en práctica para alcanzar el desarrollo en Iberoamérica, sino los mecanismos,herramientas y técnicas computacionales que permitirían lograrlo. La combinación de áreas técnicasde información asociadas al área social ha permitido que Enl@ce difunda investigaciones clavede la llamada brecha digital social.
Page 1 /340535
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.