Browsing Theses & Dissertations by Title
Now showing items 199-218 of 2526
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Bacterias antagonistas del nemátodo de quiste de la soya, Heterodera glycines, aisladas de un suelo en Puerto Rico
(2014)Soy bean cyst nematode ( Heterodera glycines) was reported in Puerto Rico in 1999. This represents a threat to the cultivation of soybean Glycine max. Although the parasite is in one location, it is necessary to know if ... -
Bacterias asociadas al cultivo del plátano (Musa sp.) y su relación con el aborto del racimo
(2003)Plantain production (Musa spp.) in Central, South America and the Caribbean is limited by bacterial diseases. In Puerto Rico, the production of the plantain “Hua Moa” is affected by a disease called bunch abortion or choke ... -
Bacterias fototróficas anoxigénicas púrpuras no-sulfurosas en la fitotelmata de bromelias en diversos bosques de Puerto Rico
(2009)Due to the special arrangement of their leaves, plants of the Bromeliaceae family like bromeliad are capable of forming special structures that create an environment called phytotelmata. This aquatic microhabitat serves ... -
Bacterias presentes en el sistema vascular de algunos cítricos en Puerto Rico
(2006)El cultivo de los cítricos es uno de los más importantes y con mayor demanda mundial en la industria de las frutas. Este cultivo está siendo objeto de numerosas investigaciones por las diversas enfermedades que lo afectan; ... -
Bacteriófagos específicos para Rhodobacter sphaeroides: aislamiento, caracterización y potenciales transductores
(2005)Los bacteriófagos son partículas que infectan específicamente bacterias. El desarrollo lítico o lisogénico de su infección, promueve el flujo de nutrientes, el control de comunidades microbianas y la transferencia genética. ... -
Balance de fósforo en vaquerías de Puerto Rico
(2005)On-farm phosphorus (P) balances are of importance in order to identify critical control points in P feeding and management. Phosphorus mass balances were constructed in twelve pasture-based dairy farms of Puerto Rico, using ... -
Ballistic impact analysis of balsa core sandwich composites
(2013)This thesis achieves a reasonable advance in understanding how balsa core sandwich composites with thin carbon fiber skins behave under impact loads through the empirical analysis of single and multiple impacts. It was ... -
Battery-free wireless pressure sensor
(2010-12)In this project two differents battery-free wireless pressure sensors have been developed with the same structure with two major parts: a capacitor that serves as a pressure sensing element and an inductor which works as ... -
BCS class II drug dispersions in hydroxypropyl methylcellulose solutions: The effect of polymer molecular weight and drug loading on the steady-state rheology of HPMC solutions
(2015)Physical biopolymer gels are ideal candidates for the drug delivery of solid pharmaceutical drugs. Nevertheless, inclusion of particles may affect the rheology and gelation of these systems. In this work, we evaluate the ... -
Beachrock characterization and historical shoreline changes in selected locations along the coast of Puerto Rico
(2018-12-10)Beachrock is characterized by rapid cementation, is exposed mainly in the intertidal zone, and it can provide a record of sea level fluctuations, episodic events, and serve as an archeological proxy. The presence of beachrock ... -
Because they said so: Life stories of four college students in Puerto Rico and the influential factors in their English learning process
(2009)This investigation used life history to understand the different factors that have influenced the current motivations to learn English and perceptions about this language of several learners at the University of Puerto ... -
Behavior of corrugated metal panels for use as storm shutters
(2009)This investigation presents a study of the nonlinear dynamics of thin-walled folded plate structures under the localized impact of a rigid object. The research emerges in the context of the structural design and assessment ... -
Bending and shear load rating of an arch ring bridge
(2011)This MS thesis entails an analytical study of the structural behavior of a concrete arch beam from the Lahontan Dam Spillway Bridge located in the city on Fallon, NV. This comes as a necessity from the U.S. Army Corps of ... -
Benefits of electric generation displacement using solar thermal water heaters
(2005)This work presents an estimate in increased efficiency of the power system, due to the reduction of electric losses at the transmission and distribution levels. It further explores the environmental impact due to generation ... -
Benthic algae biological indicators of trophic status in tropical streams
(2014)This study describes the stressor-response relationships between water quality parameters and periphyton biomass on artificial and natural substrates of three tropical streams with contrasting trophic status. At the nutrient ... -
Benthic habitat mapping and bio-optical characterization La Parguera Marine Reserve using passive and active remote sensing data
(2015)Remote sensing techniques are widely useful in the field of oceanography and provide a better understanding of the dynamics of ocean circulation, in monitoring climate change, for navigation and fisheries management, and ... -
Benthic macroinvertebrates as bioindicators of water quality in the Yaguez River, Mayaguez, Puerto Rico
(2008)The objective of this study was to correlate the diversity of aquatic macroinvertebrates with water quality of the Yagüez River in Mayaguez, Puerto Rico. In the year 2005, for a period of eight months (January 27-December ... -
Bifunctional catalysts with improved hydrothermal stability for the hydrolytic hydrogenation of cellulose into polyols
(2014)The increase in the world’s energy needs has caused a renewed interest in finding green ways to produce fuels. In this work, we present a study of the hydrolytic hydrogenation of cellulose on bifunctional catalysts for the ... -
Binning in the chi-square goodness-of-fit test
(2019-07-10)One of the most commonly used goodness-of-fit tests is based on Pearson's chi-square statistic. Since this requires class intervals for the data, questions arise with respect to the method of estimation, types, and the ... -
Bioactivity study and analysis of the volatile constituents and essential oil extracts of Mammea Americana L. fruit by HS-SPME and GC/MS
(2017)Mammea Americana L. is a tropical fruit tree native from the West Indies with bark, seeds, leaves and flowers that have been reported to contain toxic compounds. However, it is the fruit pulp that results attractive for ...