Resumen: El objetivo de este estudio fue analizar la relación entre el poder sobre la relación de pareja y la doble moral, y su influencia en la predicción del riesgo de infección de VIH en adolescentes colombianos. La muestra fue de 599 adolescentes (entre 12 y 18 años), de ambos sexos, estudiantes de secundaria de colegios públicos y privados. Para construir el índice de riesgo se utilizaron las siguientes variables (preguntando siempre sobre el período de los últimos 12 meses): Uso consistente del preservativo, núme-ro de parejas sexuales, tener relaciones sexuales bajo los efectos de alguna droga, haber utilizado la píldora del día después, e iniciativa en el uso del preservativo. Los predictores fueron el poder en la relación de pareja y la doble moral. Se obtuvo que las mujeres tienen un mayor poder en sus relaciones de pareja y menor adhesión a la doble moral. La baja adherencia a la doble moral se relacionó con un mayor poder en la relación y éste predijo un menor riesgo de infección por VIH (la doble moral no se relacionó directamente con riesgo de infección de VIH). En varones la adherencia a la doble moral predice un mayor riesgo de infección. Palabras clave: Relaciones de poder en la pareja; doble moral; VIH; adolescentes.Title: Construction of a risk index of HIV infection and its relation to double morale and dyadic power in adolescents Abstract:The current study aimed to analyze the link between power over couple relationship and double morale, and its influence on the prevention of HIV infection risk in Colombian adolescents. The sample was composed of 599 adolescents, males and females aged between 12 and 18 studying in public or private schools. In order to construct the risk index the following variables were used: Consistent condom use, Number of sexual partners, having sexual intercourse under the effects of some drug, Having used the morning-after pill and Self-initiative in condom use. Predictors were power over couple relationship and double morale. Results indicated that women had more power in their couple relationships and lower adherence to double morale. Low adherence to double morale was related to more power in the relationship, which predicted less risk of HIV infection. Double morale was not directly associated with risk of HIV infection. In men, adherence to double morale predicted an enhanced risk of infection. Key words: Power relationships in couple; double morale; adolescents. IntroducciónUn gran número de estudios sobre el uso consistente del preservativo en adolescentes concluyen que las mujeres informan de un menor uso del mismo Fagan y McDonell, 2010;Gayet, Juárez, Pedrosa y Magis, 2003;Gurman y Borzekowski, 2004; Teva, Bermúdez y BuelaCasal, 2009). Una posible explicación a este hecho es que las mujeres tienen menor poder en sus relaciones de pareja (Fernández-Esquer, Atkinson, Diamond, Useche y Mendiola, 2004;Harvey, Beckman, Browner, y Sherman, 2002). A su vez, este bajo poder en las relaciones se explica por el hecho de que, en sociedades patriarcales, se espera que ...

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The aim of this study was to examine characterisctics of precoital sexual behaviors and types of sexual contact in adolescent. A representative sample of 4,456 Spanish high school students participated. These participants were selected by means of a stratified random sampling procedure. They completed a questionnaire about their sexual behaviour. It is a cross-sectional survey study. Differences according to age and gender in characteristics of sexual behaviour before the onset of sexual intercourse were found. Compared to females, males started non penetrative sexual experiences earlier, had a higher number of sexual partners and a higher percentage of males reported having had casual sexual partner. This study not only adds to knowledge about sexual behaviour before the initiation of sexual intercourse among adolescents, it also highlights the importance of developing sexual prevention strategies for young adolescents.

Ubiquitous systems should properly support the connection/disconnection of entities at run-time. Accordingly, the communication of information in this type of systems should be able to adapt themselves to changes in their structure and participant entities without any need of user intervention. In this regard and due to the dynamic nature of these systems, asynchronous communication is more useful than synchronous one. Particularly, the publish/subscribe paradigm is used as it supports, not only asynchronous communications, but also the loose coupling between system entities, which is an important requirement that has to be satisfied in order to deal with the changes in the configuration of the communications between the involved entities. In this paper, we propose a model of dynamically redefinable events in order to support dynamic reconfiguration of communications in ubiquitous systems. We also introduce associated techniques for publishing, subscribing and combining those events. The structure of the events and their intended semantics will be formally specified in an ontology, which enables automated reasoning based on Description Logics. Furthermore, the proposal is described by means of an example and implemented as part of a coordination middleware intended to support the development of ubiquitous systems.

There is an evident epidemiological association between plasma insulin levels and blood pressure. The mechanism that relates insulin to blood pressure and the role of insulin in the pathogenesis of arterial hypertension have not been clearly defined. The present study was designed to examine the effects of chronic hyperinsulinism on blood pressure and to determine different related morphological variables. WistarKyoto rats were subcutaneously injected with insulin (25 UI/Kg of weight) daily during the eight weeks of the experiment. Data were collected on systolic and diastolic arterial pressures and heart rate by plethysmography and direct recording (in the last week), and on morphological variables. A statistically significant elevation of systolic arterial pressure was produced after the sixth week of hyperinsulinaemia. At the end of the treatment, the systolic arterial pressure was 173.7 +/- 26.1 in the hyperinsulinaemic rats versus 153.09 +/- 21.7 in the control group. The values obtained by direct recording and by plethysmography did not differ. These results indicate that chronic hyperinsulinism produces a significant elevation in systolic blood pressure levels in the rats studied.