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Now showing items 2142-2161 of 2799
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Factors affecting seed germination and seedling establishment of Harrisia portoricensis (Cactaceae) in Mona Island
(External Scientific Advisory Committe (ESAC), 2009-11)Germination, establishment, and survival of young plants appear to be the most critical phases in the life cycle of cacti (Godínez-Alvarez et al. 2003). Thus, understand factors affecting processes of germination and ... -
Faros de Puerto Rico
(Ediciones Digitales, 2013) -
Fe8-Based MRI Contrast Agents Targeted to Breast and Ovarian Cancer Cells
Magnetic resonance imaging (MRI) contrast agents (CA’s) are of great interest for cancer imaging as a complementary tool in cancer diagnosis. Tumor-targeting MRI-CA conjugates based on an [Fe8O4(pz)12Cl4] paramagnetic ... -
First Report of a Quaternary Crocodylian from a Cave Deposit in Northern Puerto Rico
(Caribbean Journal of Science, Vol. 43, No. 2, 273-277, 2007, 2007-12)The first occurrence of crocodylians from the Quaternary of mainland Puerto Rico is reported from a cave in northern Puerto Rico: this record expands the distribution of crocodylians eastward in the Caribbean region during ... -
Floods, Habitat Hydraulics and Upstream Migration of Neritina virginea (Gastropoda: Neritidae) in Northeastern Puerto Rico
(Caribbean Journal of Science, Vol. 41, No. 1, 55-74, 2005, 2005-04)Massive upstream migrations of neritid snails (Neritidae: Gastropoda) occur in tropical and subtropical streams worldwide, but their seasonality and proximate causes are unknown. We monitored massive upstream migrations ... -
Flower Phenology and Sexual Maturation: Partial Protandrous Behavior in Three Species of Orchids
(Caribbean Journal of Science, Vol. 42, No. 1, 75-80, 2006, 2006-04)Plants have theoretically multiple alternatives for preventing self pollination and consequently the effect of inbreeding, such as sequential flowering, dichogamy and self–incompatibility to name a few. We investigated the ... -
Foraging Behavior, Home Range, Movements and Activity Patterns of Epicrates inornatus (Boidae) at Mata de Plátano Reserve in Arecibo, Puerto Rico
(Caribbean Journal of Science, Vol. 40, No. 3, 343–352, 2004, 2004-12)Observations of foraging behavior of the Puerto Rican boa (Epicrates inornatus) were performed at a cave entrance beginning one hour before sunset until one hour after sunrise. Boas captured bats from 1745 h to 0600 h, but ... -
Forests Surrounding the Joyuda Lagoon, Puerto Rico: 67 Years of Change
(Caribbean Journal of Science, Vol. 43, No. 1, 142-147, 2007, 2007-06)This study describes forest cover changes and the current vegetation in the area surrounding the Joyuda Lagoon in western Puerto Rico.Forest cover increased from 22 ha to 87 ha between 1930 to 1997. This increase is the ... -
Fostering Multidisciplinary Collaboration to Advance Knowledge Management into the University of Puerto Rico’s Graduate Studies
(2007-08)How can the Island of Puerto Rico, a US territory in the Caribbean, be transformed into a knowledge-based economy to play a significant role in the networked global community? This has been one of the critical inquiries ... -
Fractional gaussian estimates and holomorphy of semigroups
(Universidad de Puerto Rico Recinto de Río Piedras, 2019-10)Let Ω ⊂ RN be an arbitrary open set and denote by (e−t(−∆)sRN )t≥0 (where 0 < s < 1) the semigroup on L 2 (R N ) generated by the fractional Laplace operator. In the first part of the thesis we show that if T is a ... -
Fractional gaussian estimates and holomorphy of semigroups
(Universidad de Puerto Rico. Recinto de Rio Piedras, 2019-10)Let Ω ⊂ RN be an arbitrary open set and denote by (e −t(−∆)s RN )t≥0 (where 0 < s < 1) the semigroup on L 2 (R N ) generated by the fractional Laplace operator. In the first part of the thesis we show that if T is a ... -
Francia en la literatura puertorriqueña
(Cuarto Propio, 2009-09)Este ensayo ausculta la influencia francesa en la literatura puertorriqueña. This essay explores the French influence in Puerto Rican literature. -
Francia y Puerto Rico, investigaciones paralelas y colaboración en aspectos de Biología Molecular y Biotecnología
(Universidad de Puerto Rico, 2010-04)Desde finales de los años setenta, en el laboratorio de Biología Molecular de la doctora Candelas, nos hemos dedicado a estudiar los mecanismos moleculares que regulan la síntesis de la seda en la araña Nephila clavipes. ... -
Frugivory in Puerto Rican Anolis lizards and its possible effects on seed dispersal in tropical dry and moist forests on karst
(External Scientific Advisory Committe (ESAC), 2009-11)Feeding is an important component in consumer-resource interactions of population-community ecology and in energy and nutrient transfers of ecosystems ecology (Bengtsson 1998). Food webs are used to describe the complexity ... -
Function and Diversity of Benthic Biofilm Communities in Tropical Stream Ecosystems: The Relevance of Land Use and Reach Factors
Human activities represent an important cause of degradation to aquatic ecosystems. The replacement of forest cover areas by urbanization can cause changes in ecosystem function as well as the loss of species. In stream ... -
Fundamentos morales de las evaluaciones de los contadores: Estudio empírico de Latinoamérica y Estados Unidos.
(Centro de Investigaciones Comerciales e Iniciativas Académicas de la Facultad de Administración de Empresas. Forum Empresarial. Vol.13. Num.1, 2008-05)Existe la necesidad de crear instrumentos de medición precisos y adaptarlos a diferentes culturas o países. En esa dirección, este estudio examina las evaluaciones éticas de estudiantes de contaduría de 10 países ... -
Fusel oil in alcoholic distillation : experimental data on its distribution by plates of continuous distillation columns under different operating conditions
(2010-09-22)En este trabajo se describen los procesos de destilación usados comercialmente. Se discute el comportamiento del aceite de fúsel en destilaciones intermitentes y continuas.