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Mostrando ítems 769-788 de 4100
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Decreased hyperpolarization-activated cation current (I<sub>h</sub>): a response mechanism to reduce cocaine-induced excitability in VTA DA neurons.
(2022-06-09)The hyperpolarization-activated cation current (I<sub>h</sub>) is a determinant of intrinsic excitability in dopaminergic neurons (DA) of the ventral tegmental area (VTA). I<sub>h</sub> is a slowly activating cation inward ... -
Deep learning for animal audio classification - a foundational approach
(2022-06-10)Despite impressive successes in computer vision, deep learning has made more limited progress for audio data, mostly in voice recognition and speech processing. Furthermore, most such work has depended on spectrograms and ... -
Deep reef fishes off La Parguera insular slope, Puerto Rico, and their connectivity with shallow reefs
(2013)This dissertation characterizes the fish community associated with Mesophotic Coral Ecosystems (MCEs) of the La Parguera shelf-slope between 2007 and 2011 using rebreather trimix technical diving. Fishes were identified, ... -
Definition and deployment of a quality System for a small firm — the model Factory of the mayagüez campus
(2008)This work presents the methodology and results of the deployment of a quality system in a small business environment. This quality system was implemented at the Model Factory of the University of Puerto Rico, Mayagüez ... -
Definition and deployment of quality tools for quality and uptime improvement in a manufacturing environment
(2006)In order to be able to prevail nowadays all companies must have knowledge of the new technologies and advances that arise daily, specially the manufacturing sector regulated by the FDA. As result of this, companies need ... -
Degradación de biodiesel y diversidad bacteriana en suelos arenosos de una zona industrial (Guayanilla, Puerto Rico)
(2005)Biodegradation of biodiesel from an industrial impacted sandy soil (Guayanilla Bay, Puerto Rico) and bacterial diversity was evaluated. Soil samples were amended with 2,500 mg/Kg of biodiesel and incubated during 41 days ... -
Degradación de p-Nitrofenol por bacterias en los ríos Añasco y Guanajibo y la Quebrada de Oro (Puerto Rico)
(2007)Biodegradation of p-nitrophenol and changes in bacterial communities during degradation process in water samples from the Añasco and Guanajibo rivers and Quebrada de Oro were determined. The degradation rate of p-nitrophenol ... -
Degradation of caffeine in coffee pulp by solid-state fermentation
(2015)Coffee pulp is the most abundant solid waste in coffee processing plants. Its reutilization could be a challenge due to the presence of compounds such as caffeine. In the current study the solid-state fermentation was ... -
Del privilegio a los márgenes : la evolución de la representación de los personajes femeninos en Papeles de Pandora de Rosario Ferré, Cuentos traidores de Rubis Camacho y las Negras de Yolanda Arroyo Pizarro
(2023-12-19)En la Década del Setenta del siglo XX, la literatura escrita por mujeres revolucionó la literatura puertorriqueña. Con Papeles de Pandora de Rosario Ferré da inicio la literatura feminista en Puerto Rico. En ese primer ... -
Democratización del arte urbano : un repositorio digital para la conservación del arte efímero
(2021-05-14)El deterioro de edificios y la consiguiente devaluación económica ha abocado a los barrios, muchos de los cuales conforman los cascos antiguos de algunas ciudades y pueblos, a un proceso de transformación de entorno. Por ... -
Densidad poblacional de Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) y su relación fenológica con los cultivos de tomate y maíz
(2007)Helicoverpa zea (Boddie) is the most important insect pest of tomato, Lycopersicum esculentum (Mill.), and corn, Zea mays L. A study was conducted (2003-2004) to estimate the density and phenology of H. zea in commercial ... -
Densidad y altura de corte y su efecto sobre el rendimiento y persistencia de Ubon Stylo (Stylosanthes guianesnsis var. vulgaris x var. pauciflora) en un oxisol de Puerto Rico
(2009)Información sobre el comportamiento de Ubon Stylo (Stylosanthes guianensis; var. vulgaris x var. pauciflora), (95 por ciento de germinación) durante el período de establecimiento es limitante en Puerto Rico. Se evaluó los ... -
Dental caries and diabetes in the elderly population in San Juan, Puerto Rico
(University of Puerto Rico, Medical Sciences Campus, 2010-08)People 65 years or older constitute 11.2% of the population in Puerto Rico, where the prevalence of diabetes is 31.9%. It has been hypothesized that diabetes could be a risk factor for caries due to increased glucose in ... -
Dependence of active mode remote Ft-Ir sensing on angle of incidence, substrate type and analyte surface concentration
(2013-12)A standoff detection scheme for a highly energetic material (HEM) and other threat chemicals deposited on substrates as contamination residues using Fourier transform infrared spectroscopy (FTIR) is described. The HEM used ... -
Deposición de proteína y energía en tilapias (Oreochromis spp.) alimentadas con dietas sub-óptimas en proteína y suplementadas con ácido glutámico, alfacetoglutárico o succínico
(2011)Four experimental diets were formulated in order to determine their effect on weight gain, fat, protein and energy retention, and body composition of tilapias (Oreochromis spp.). The control diet was formulated to contain ... -
Deposición y caracterización de películas delgadas de KTa1-x NbxO3 (ktn) dopadas con litio
(2006)In this research work suitable conditions were found for deposition of epitaxial thin films of potasium niobate-tantalate (KTN) and lithium-doped potassium-niobate tantalate (KLTN) using the Pulsed Laser Deposition (PLD) ... -
Deposition and characterization of thin films of vanadium dioxide
(2019-07-09)In this work, thin films of VO2 and V2O3, were deposited on glass (SiO2) and TiO2 (001) substrates, by D.C. magnetron sputtering, in order to study their structural, electrical, optical and morphological properties. In ... -
Depositional and diagenetic history of Mona and Monito islands, Puerto Rico and La Romana province, Dominican Republic: A regional study
(2016)Two main study sites were covered in this research: (1) Monito Island in the Mona Reef Complex, Puerto Rico and, (2) the intersection at Cḩavón River with Highway El Coral at La Romana Province, Southeast Dominican Republic. ... -
Derecho, política agraria y sociedad : la diversidad del colonato ante el Nuevo Trato en el Este de Puerto Rico, 1933-1940.
(2019-12-16)Al implantarse las políticas y programas del Nuevo Trato en Puerto Rico se impactó no sólo la tenencia de la tierra sino la mano de obra. Las agencias creadas al amparo del Nuevo Trato otorgaron subsidios a los colonos ...