Sympathetic afferent fibers originate from a visceral organ, course in the thoracolumbar rami communicantes, have cell bodies located in dorsal root ganglia, and terminate in the gray matter of the spinal cord. Sympathetic afferent fibers from the heart transmit information about noxious stimuli associated with myocardial ischemia, i. e. angina pectoris. Previous reviews have described the characteristics of cardiovascular sympathetic afferent fibers (Bishop et al. 1983; Malliani 1982). This review summarizes that work and focuses on the neural mechanisms underlying the complexities of angina pectoris. In order to understand anginal pain, cells forming the classical pain pathway, the spinothalamic tract (STn, were chosen for study. These cells were chosen to address questions about anginal pain because they transmit nociceptive informa of pain. Antidromic tion to brain regions that are involved in the perception activation of STT cells provided a means of identifying cells involved with trans mission of nociceptive information in anesthetized animals. Other ascending pathways may also transmit nociceptive information, but many studies show that the STT plays an important role. Visceral pain is commonly referred to overlying somatic structures. The pain of angina pectoris can be sensed over a wide area of the thorax: in the retrosternal, precordial anterior thoracic, and anterior cervical regions of the chest; in the left or sometimes even the right shoulder, arm, wrist, or hand; or in the jaw and teeth (Harrison and Reeves 1968)."

The study of the functional organization of the first synapse of the centripetal visual pathway at the outer plexiform layer level (OPL) ought to be made through the application of combined histological, electrophysiological, and neurochemical techniques. A large amount of new evidence has been accumu lated in the past 20 years on the structure of the retina and on the electrical responses of retinal cells to light stimulus. Also, recently, many substances considered as neurotransmitters in the brain have been found in the retina. The goal of the study of retinal function is to integrate the data obtained by structural and electrophysiological techniques and to identify and determine the role played by neurotransmitters or neuromodulators in the function of the retina. In this study it is important to realize the morphological and biochemical diversi ty displayed by the visual cells in the vertebrate retina which, according to Cresci telli (1972), has been produced "through the interaction of natural selection with diversity in the photic environment." The evidence obtained shows that bipolar and especially horizontal cells, closely related to visual cells, display morphologi cal and probably biochemical differences among classes, genus, and even species according to the photic environment. These differences give peculiarities to the organization of the OPL, which must be taken into account when studying a par ticular retina with electrophysiological or neurochemical techniques."

Este estudio pretende impulsar el desarrollo economico y agroindustrial del municipio de Palestina Caldas (Colombia), mediante la generacion de valor agregado a productos agricolas como la Guayaba, particularmente con la elaboracion de conservas; aprovechando los potenciales recursos disponibles en la region. A traves de estudios de mercados, tecnico, organizacional y financiero, que permitan establecer la factibilidad o pertinencia del montaje de una planta procesadora de frutas, con todos los parametros de calidad necesarios para ofrecer productos inocuos y con excelentes cualidades sensoriales y nutricionales."

El planeta Tierra esta en condiciones deplorables y ya no soporta a esta humanidad inconsciente guerrera. Esta tratando de deshacerse de todo lo que tiene encima por medio de terremotos, inundaciones, deslaves causando la muerte de mucha gente. Los Irinios nos ofrecen su ayuda para escapar antes de que sea demasiado tarde.

La vida de Jesus de Nazaret que escondieron los escritores del Nuevo Testamento, sobre todo la confusion falsa del Barrabas El Bandolero con el BarABBAS, Hijo de Dios. Se presenta a Jesus como el hijo de Dios, pero tambien las consecuencias de haber sido hombre que nos ensena a perdonar y a amar, y ser como hermanos con quienes nos rodean.