After the lost decade of the 1980s, the 1990s represent the "decade of hope" for Latin America. A vigorous economic transformation is reducing the role of the state and allowing the private sector to become once again the main engine of development. What is the relation between this growing role of the private sector and the increasingly important need to conserve the environment?   This article explores this relation and establishes that a healthy environment is the foundation over which long-term sustainable development can be built. Furthermore, given the very rich natural resources and environmental characteristics of the region, the main comparative advantages over which prosperous Latin America societies can be built must consider these ecological riches. The beginning of the third millennium provides an excellent opportunity for this paradigm shift to occur.

In hypertensive subjects-carotid sinus stimulation can lower blood pressure to normal or subnormal. The reflection shortens the fatigue of cardiac patients undergoing exercise testing. In acute left ventricular failure accompanied by hypertension-carotid sinus massage is a therapeutic procedure recommended.

By various methods has been possible to obtain all of monophasic action potential in accordance with the theory of the membrane were theoretically predictable. In an injured area resting potential of the membrane may remain unchanged, being zero or supernormal subnormal. Consequently they can register monophasic action potential currents without damage, or injury caused by streams or hipopolarización membrane hyperpolarization. The only essential requirement to record monophasic action potentials is blocking the excitation, the current of injury is a phenomenon that attachment may or may not be present. When the heart muscle is severely injured the excitation process is blocked and then monophasic action potentials are inscribed. By decreasing the damage processes depolarization and repolarization are performed slowly and then enroll QRS-T complex and large widths. When the deterioratio...

There are many researchers who are regarded as precursors of modern ballistocardiography; have also been countless instruments with which for many years has tried to obtain records from the mechanical activity of the heart. The merit of a systematic study and a suitable instrument belongs to STARR, Philadelphia.

Modifications r waves early in the right precordial leads when a left locking occurs due to abnormal excitation current in the septum. The way of activation wave progresses in the regions engaged by the lock and the abnormal orientation of the vectors representing the electric forces in these regions, may explain the QRS-T changes observed in the electrocardiograms at the left locking ensue . Analysis of correlative changes "Waves B" or waves and blocking waves represent the normal ventricular activation clarification pathogenesis of the left blocks. The left blocks are manifested electrocardiographically as "intramural". The different lock types are to be left to the extent and magnitude of functional impairment of specialized muscle fibers in which the activation proceeds very quickly. For its size the left blocks are "partial" or "total". The duration of the ventricular complex does n...

After the lost decade of the 1980s, the 1990s represent the “decade of hope“ for Latin America. A vigorous economic transformation is reducing the role of the state and allowing the private sector to become once again the main engine of development. What is the relation between this growing role of the private sector and the increasingly important need to conserve the environment? This article explores this relation and establishes that a healthy environment is the foundation over which long-term sustainable development can be built. Furthermore, given the very rich natural resources and environmental characteristics of the region, the main comparative advantages over which prosperous Latin America societies can be built must consider these ecological riches. The beginning of the third millennium provides an excellent opportunity for this paradigm shift to occur.

This work was carried out with the objective to determine the sustainability of cocoa farms in the district of Huicungo (San Martín, Perú) by using the “Rapid Agroecological Method”. The study was conducted in the San Martín region, province of Mariscal Cáceres, district of Huicungo. The zone has an annual precipitation of 1, 200 mm and an annual temperature of 30ºC. For the sustainability analysis, we selected “type farms” from each of the three groups found in the area. In each of these, indicators of soil quality and crop health were evaluated using values ranging from 1 to 10 (1: less sustainable, 10: more sustainable). With the collected data, Duncan Test (p ≤ 0.05) was performed to determine the statistical differences between the “type farms”. Results showed the evaluated cacao farms had values greater than five, therefore, they are sustainable. There were no st...

El estudio se realizó en la Microcuenca Cuyani en el distrito de Pichanaki (Perú), con el objetivo de caracterizar fincas productoras de piña. Se trabajó con una organización que cuenta con 45 productores de los cuales se tomó una muestra de 31 productores a través del “Método de Proporciones” y se realizó una encuesta con preguntas relacionadas a los aspectos económicos, sociales, ambientales. Se encontró que el responsable de la finca en su mayoría es varón, por encima de los 33 años y la mayor parte con estudios de secundaria completa. Tienen una finca de 1 a 10 ha; pero solo sólo siembran de 0.25 a 1.5 ha con piña, predomina el sistema de producción convencional, con rendimientos que van de 50 a 80 t/ha en variedades como Hawaiana y MD2 (Golden) y consideran que las malezas y enfermedades son los factores limitantes más importantes del cultivo. El análisis de c...

The objective of this study was to characterize banana farms in the Cuyani Microbasin in the district of Pichanaki, Chanchamayo province (Junín, Peru). We worked with a producer organization that has 400 partners, of which a sample was taken (n = 80) using the proportions method. It was found that the banana farms are very diverse, the person in charge is mostly a man, but there is an interesting percentage of the female gender in the administration of the farms. In general, producers have a basic educational level. The production system is traditional, the banana is grown alone or associated with other crops, such as coffee. Most producers consider that pests and diseases are the main factors limiting production, since they reduce yields and increase production costs. The farms were classified in five groups, the most important of which was 45% of the farms whose owner is a male, betwe...

Se aplicaron encuestas a una muestra de 83 productores de limón de esta provincia, con preguntas estructuradas sobre dimensiones económicas, ecológicas y socioculturales. La sustentabilidad se determinó con técnicas de análisis multicriterio para calcular el Indicador Económico (IK), Indicador Ecológico (IE) e Indicador Sociocultural (ISC), para estimar el Indicador General de Sustentabilidad (IS Gen) de cada finca. El 25,3% de las explotaciones tenían un IK> 2; 60,24% un IE> 2 y 55,4% un ISC> 2. El 74,7% de las fincas tenían un IS Gen <2, lo que indica que las fincas no son sostenibles.