Alejandro Heredia

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Demyelination of the myelinated peripheral or central axon is a common pathophysiological step in the clinical manifestation of several human diseases of the peripheral and the central nervous system such as the majority of Charcot-Marie-Tooth syndromes and multiple sclerosis, respectively. The structural degradation of the axon insulating myelin sheath has(More)
Though harvester ants are closely similar in ecology, species differ in their worker size polymorphism as well as in the glandular source of their trail pheromones and defensive compounds. In the harvester ant Messor barbarus, we find that the recruitment trail pheromone is located in the Dufour gland, while defence-alarm substances are produced in the(More)
Combined homicide-suicides have been classified based on the psychopathology of the perpetrator and the nature of the relationship between perpetrator and victim(s). To further understand the nature of this tragic phenomenon and to test the validity and practicality of a previously suggested classification system, investigators systematically collected data(More)
PURPOSE Standard brachytherapy sources emit radiation in a non-preferential direction away from the source. Though treatment outcomes are good, this can lead to late skin and subcutaneous toxicities in sensitive structures. Proposed low dose rate directional sources for interstitial brachytherapy, showed to have an improvement in the dose uniformity within(More)
PURPOSE The purpose of this work is to present results from geometric optimizations of a directional high dose rate brachytherapy (d-HDR) source using MCNP5. Three brachytherapy source designs are presented here; 1)cylindrical d-HDR (Cyl.1), 2) D-shaped d-HDR version 1 (D.1), and 3) D-shaped d-HDR version 2 (D.2). METHODS The sources were modeled using(More)
AIM Symmetry is a property established in many human biological systems and it is reasonable to expect that it may also exist in the mouth. The objective of this study was to examine whether there is a similar left-to-right distribution in periodontal disease. METHOD Records of 197 patients from the Periodontics department of The Royal Dental Hospital of(More)
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