Results: 3072

Extrusión Apical de Barro Dentinario e Irrigante Producidos por Dos Sistemas de Instrumentación de Níquel Titanio al Utilizar Irrigación Pasiva o Activa

RESUMEN: El barro dentinario producido durante tratamiento endodóntico puede ser extruido hacia el tejido periradicular junto con el irrigante, produciendo inflamación y dolor postoperatorio. Comparar la cantidad de extrusión apical de barro dentinario e irrigante, producido durante la preparación qu...

Evaluación in Vitro de la Biocompatibilidad de Cuatro Cementos Selladores con Osteoblastos Humanos

RESUMEN: El correcto sellado apical es un paso importante durante el tratamiento de conductos, para esto, se utilizan puntas de gutapercha y cemento sellador, de este último existen diversas formulaciones químicas en el mercado, por lo cual es importante tomar en cuenta los efectos que estas pueden ten...

Proximate composition of several macroalgae from the coast of Salinas Bay, Ecuador

Rev. biol. trop; 67 (1), 2019
Abstract Seaweeds are accessible and important marine organisms found in coastal zones, which have shown their nutritive potential as food or additive. These organisms are relatively abundant in the coastline of Ecuador, but their biochemical composition has not been adequately studied. Therefore, the ai...

Microbialite-like structures in Cladophora sp. (Ulvophyceae) mats from a subtropical Andean basin: ecological implications

Rev. biol. trop; 67 (1), 2019
Abstract The solubility equilibrium of calcite is influenced by physicochemical, climatic and biological factors. Annual cycles of exceptionally prolonged drought, in conjunction with naturally occurring diffuse organic pollution, generate the unique conditions for the precipitation of lithified carbonat...

Onthophagus landolti and Canthon indigaceus chevrolati (Coleoptera: Scarabaeinae) are attracted to the feces of ivermectin-treated cattle in the Mexican tropics

Rev. biol. trop; 67 (1), 2019
Abstract Ivermectin (IVM) is widely used for parasite control in livestock in the tropics. Residual IVM in feces conserves its insecticide activity for weeks and can harm dung beetle (DB) species. Attraction to the feces of IVM-treated cattle was tested using the DB species Onthophagus landolti (Harold) ...

Essential oil composition in natural population of Lippia origanoides (Verbenaceae) during dry and rainy seasons

Rev. biol. trop; 67 (1), 2019
Abstract Lippia origanoides Kunth. is a medicinal shrub native to some countries in South America, Central America and the Caribbean. This study aims to investigate the chemical composition of the essential oil and the genetic diversity of a natural population of Lippia origanoides in two seasons. Leaf s...

Estudio de alteraciones neurocognitivas en pacientes infectados por el virus de la inmunodeficiencia humana
Study of neurocognitive alterations in patients infected by the human immunodeficiency virus

Gac. méd. Caracas; 127 (1), 2019
El virus de inmunodeficiencia humana, conocido por su impacto en el sistema inmunológico, ocasionamanifestacionesneurológicas progresivas con afectación cognitiva, perturbando funciones de atención, memoria, lenguaje, ejecución y procesamiento de la información, lo cual interfiere de forma negativa...

Phenolic compounds from Virola venosa (Myristicaceae) and evaluation of their antioxidant and enzyme inhibition potential

Acta amaz; 49 (1), 2019
Virola venosa, popularly known in Brazil as ucuuba-da-mata, occurs naturally in the Amazon region and has potential to provide useful natural compounds, as already known for other Virola species. Therefore, the objective of this study was to determine the chemical composition of bark and leaf extracts of...

Alternative vibro-dynamic compression processing of wood-cement composites using Amazonian wood

Acta amaz; 49 (1), 2019
Wood-cement composite (WCC) is a potential construction material for tropical regions, due to its physico-mechanical properties and resistance to decay and fungi attack. However it is important to test alternative production methods and wood materials that are easier and cheaper than those traditionally ...