oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 42 )

2018 ( 372 )

2017 ( 374 )

2016 ( 425 )

Custom range...

Search Results: 1 - 10 of 218913 matches for " Nora L. álvarez-Berríos "
All listed articles are free for downloading (OA Articles)
Page 1 /218913
Display every page Item
Mapping Urbanization Dynamics in Major Cities of Colombia, Ecuador, Perú, and Bolivia Using Night-Time Satellite Imagery
Isabel K. Parés-Ramos,Nora L. álvarez-Berríos,T. Mitchell Aide
Land , 2013, DOI: 10.3390/land2010037
Abstract: By 2050, 90% of the population in Latin America will live in cities, but there is a lack of up-to-date spatial information about the urban extent and patterns of urbanization in cities of this region. In this study, we analyzed population growth, urban density and urbanization dynamics between 1992 and 2009 in the major cities of Bolivia, Colombia, Ecuador and Perú using Google Earth and DMSP/OLS night-time lights imagery. We used Google Earth to map the urban extent, and time series of night-time lights to analyze spatial patterns of urban development. The dominant urban development patterns were: high-density compact in Bogotá, Cali, Guayaquil, and Medellín; high-density expansive growth in La Paz/El Alto; low-density expansive in Quito and Santa Cruz; and a mix of high-density compact and suburban growth in Lima. Urban growth occurred largely along the periphery of cities, influenced by the local landscape and by demographic and socioeconomic factors such as immigration and housing prices. Urban density in Colombia (>20,000 per/km 2) was among the highest in the world. Future growth in the region will probably be characterized by densification and slow urban expansion. This study also validates the utility of Google Earth and night-time lights for monitoring urbanization.
Land Change in the Greater Antilles between 2001 and 2010
Nora L. álvarez-Berríos,Daniel J. Redo,T. Mitchell Aide,Matthew L. Clark,Ricardo Grau
Land , 2013, DOI: 10.3390/land2020081
Abstract: Land change in the Greater Antilles differs markedly among countries because of varying socioeconomic histories and global influences. We assessed land change between 2001 and 2010 in municipalities (second administrative units) of Cuba, Dominican Republic, Haiti, Jamaica, and Puerto Rico. Our analysis used annual land-use/land-cover maps derived from MODIS satellite imagery to model linear change in woody vegetation, mixed-woody/plantations and agriculture/herbaceous vegetation. Using this approach, we focused on municipalities with significant change ( p ≤ 0.05). Between 2001 and 2010, the Greater Antilles gained 801 km 2 of woody vegetation. This increase was mainly due to the return of woody vegetation in Cuba, and smaller increases in Puerto Rico and the Dominican Republic. Despite relatively similar environments, the factors associated with these changes varied greatly between countries. In Puerto Rico, Dominican Republic, and Jamaica, agriculture declined while mixed-woody vegetation increased, mostly in montane regions. In contrast, Cuba experienced an extensive decline in sugarcane plantations, which resulted in the spread of an invasive woody shrub species and the increase in woody vegetation in areas of high agricultural value. In Haiti, the growing population, fuelwood consumption, and increase in agriculture contributed to woody vegetation loss; however, woody vegetation loss was accompanied with a significant increase in the mixed woody and plantations class. Most regional analyses often treated the Greater Antilles as a homogeneous unit; our results suggest that historical and socio-economic differences among countries are crucial for understanding the variation in present day land change dynamics.
Rese a de "Investigación de Mercados" de Carl McDaniel & Roger Gates
Rodrigo Berríos L.
Panorama Socioeconómico , 2007,
Abstract:
Expanding protected areas and incorporating human resource use: a study of 15 forest parks in Ecuador and Peru
Lisa Naughton-Treves,Nora Alvarez-Berríos,Katrina Brandon,Aaron Bruner
Sustainability : Science, Practice and Policy , 2006,
Abstract: Data from legal records, management plans, and interviews with 63 local experts reveal the substantial expansion of 15 protected areas (PAs) of forest in Ecuador and Peru during the last two decades. Combining results for these PAs, the area under protection increased by over half, from 5,760,814 to 8,972,896 ha, with the Amazonian PAs adding the greatest expanse. Most of this expanded land was legally designated for strict protection; however, in practice, human resource use and settlement are widespread. Hunting is the most common resource use, followed by logging and livestock grazing. Mining and petroleum extraction also occur in four of the 15 PAs. Together these activities on average affect approximately 30% of the area within eight Peruvian PAs and approximately 45% of the area of seven Ecuadorian PAs, far exceeding previous deforestation estimates. By expanding these PAs, Ecuadorian and Peruvian conservationists have significantly improved the coverage of key ecosystems and endangered habitats. However, they now face the daunting task of managing larger, more complex protected areas that de facto include thousands of local people. Conservation agencies in both countries are turning toward land-use zoning within PAs to integrate resource use with biodiversity conservation.
Calidad de vida en pacientes con hiperhidrosis primaria sometidos a simpatectomía videotoracoscópica
ZAMARíN M,JAIME; EGA?A D,JOSEFINA; BERRíOS S,RAúL;
Revista chilena de cirugía , 2011, DOI: 10.4067/S0718-40262011000500010
Abstract: introduction: primary hyperhidrosis is characterized by excessive sweating that exceeds the physiological needs to maintain thermal homeostasis of the body. this study aims to assess the change in quality of life of patients operated on videothoracoscopic sympathectomy. materials and methods: we included all patients operated with this technique in the period between 2004 and 2010, in fach hospital. a standardized cuestionary was used to measure severity of hyperhidrosis and quality of life during pre and postoperative. results: 61 patients, 57% female and mean age of 25 years. preoperative sweating was barely tolerable or unacceptable in 81%, and preoperative quality of life was poor or very poor in 82% of patients. after surgery sweating was never noticed or tolerable at 85% and the quality of life was better in 84% of patients. 78% of patients developed compensatory sweating; however the 87% were satisfied with the outcome of surgery. conclusion: videothoracoscopic sympathectomy offers excellent results that are measurable in terms of improvement of quality of life, but often associated with the phenomenon of compensatory sweating. despite the development of this sequel, the majorities of operated patients are satisfied with the surgical results and improve their quality of life.
Estudio Clinico y de Laboratorio en Glomerulonefritis Aguda Post Estreptococica: Laboratory and Clinical Features Acute Post Streptococcal Glomerulo-Nephritis
Edda Lagomarsino F,Ximena Berríos C,Alejandro Morales F,Francisco Quesney L
Revista chilena de pediatría , 1985,
Abstract:
Model of chromosome associations in Mus domesticus spermatocytes
Soledad Berríos,Marcia Manterola,Zulita Prieto,Julio López-Fenner
Biological Research , 2010,
Abstract: Understanding the spatial organization of the chromosomes in meiotic nuclei is crucial to our knowledge of the genome's functional regulation, stability and evolution. This study examined the nuclear architecture of Mus domesticus 2n=40 pachytene spermatocytes, analyzing the associations among autosomal bivalents via their Centromere Telomere Complexes (CTC). The study developed a nuclear model in which each CTC was represented as a 3D computer object. The probability of a given combination of associations among CTC was estimated by simulating a random distribution of 19 indistinguishable CTC over n indistinguishable "cells" on the nuclear envelope. The estimated association frequencies resulting from this numerical approach were similar to those obtained by quantifying actual associations in pachytene spermatocyte spreads. The nuclear localization and associations of CTC through the meiotic prophase in well-preserved nuclei were also analyzed. We concluded that throughout the meiotic prophase: 1) the CTC of autosomal bivalents are not randomly distributed in the nuclear space; 2) the CTC associate amongst themselves, probably at random, over a small surface of the nuclear envelope, at the beginning of the meiotic prophase; 3) the initial aggregation of centromere regions occurring in lepto-zygotene likely resolves into several smaller aggregates according to patterns of preferential partitioning; 4) these smaller aggregates spread over the inner face of the nuclear envelope, remaining stable until advanced stages of the meiotic prophase or even until the first meiotic division.
Calidad de vida en pacientes con hiperhidrosis primaria sometidos a simpatectomía videotoracoscópica Quality of life after videothoracic simpathectomy in patients with primary hyperhidrosis
JAIME ZAMARíN M,JOSEFINA EGA?A D,RAúL BERRíOS S
Revista Chilena de Cirugía , 2011,
Abstract: Introducción: La hiperhidrosis primaria se caracteriza por sudoración excesiva que supera las necesidades fisiológicas para mantener la homeostasis térmica del cuerpo. El objetivo de este trabajo es evaluar el cambio en la calidad de vida de los pacientes operados de simpatectomía videotoracoscópica. Material y Método: Estudio de tipo transversal del total de pacientes operados con esta técnica en el Hospital Fuerza Aérea de Chile (FACh) en el período entre 2004 y 2010. Se utilizó una encuesta estandarizada y validada en la literatura para medir severidad de la hiperhidrosis y calidad de vida en período pre y postoperatorio. Resultados: 61 pacientes, 57% de género femenino y promedio de edad 25 a os. La sudoración preoperatoria era apenas tolerable o intolerable en 81% y la calidad de vida preoperatoria era pobre o muy pobre en 82% de los pacientes. Posterior a la cirugía la sudoración nunca se notaba o era tolerable en 85% y la calidad de vida era mejor en 84% de los pacientes. El 78% de los pacientes operados desarrolló sudoración compensatoria, sin embargo, el 87% de los pacientes estaban satisfechos con el resultado de la cirugía. Conclusión: La simpatectomía videotoracoscópica ofrece excelentes resultados que son medibles en términos de mejoría de la calidad de vida, pero asociado frecuentemente al fenómeno de sudoración compensatoria. Pese al desarrollo de esta secuela, la mayoría de los pacientes operados están satisfechos con los resultados quirúrgicos y mejoran su calidad de vida. Introduction: Primary hyperhidrosis is characterized by excessive sweating that exceeds the physiological needs to maintain thermal homeostasis of the body. This study aims to assess the change in quality of life of patients operated on videothoracoscopic sympathectomy. Materials and Methods: We included all patients operated with this technique in the period between 2004 and 2010, in FACh Hospital. A standardized cuestionary was used to measure severity of hyperhidrosis and quality of life during pre and postoperative. Results: 61 patients, 57% female and mean age of 25 years. Preoperative sweating was barely tolerable or unacceptable in 81%, and preoperative quality of life was poor or very poor in 82% of patients. After surgery sweating was never noticed or tolerable at 85% and the quality of life was better in 84% of patients. 78% of patients developed compensatory sweating; however the 87% were satisfied with the outcome of surgery. Conclusion: Videothoracoscopic sympathectomy offers excellent results that are measurable in terms of improvement of quality of life
Robertsonian chromosome polymorphism of Akodon molinae (Rodentia: Sigmodontinae): analysis of trivalents in meiotic prophase Polimorfismo cromosómico Robertsoniano de Akodon molinae (Rodentia: Sigmodontinae)
RAúL FERNáNDEZ-DONOSO,SOLEDAD BERRíOS,JESUS PAGE,MARíA S MERANI
Revista chilena de historia natural , 2001,
Abstract: Akodon molinae (with 2n = 42-43-44 and an FN = 44) shows a remarkable polymorphism of chromosome 1 in natural and laboratory populations. Specimens 2n = 42, named single homozygotes (SH), have a chromosome pair 1 formed by two large metacentric chromosomes. Specimens 2n = 3, heterozygotes (Ht), have one chromosome 1 and two medium-sized subtelocentric chromosomes, 1a and 1b, which are homologous with the long and short arms of chromosome 1 respectively. Specimens 2n = 44 are double homozygotes (DH), with just two pairs of medium-sized subtelocentric chromosomes, 1a and 1b. Analysis of meiotic metaphases I and II showed that anomalous segregation occurs more frequently in spermatocytes carrying the 1a and 1b chromosomes. This would disturb gametogenesis and other reproductive and developmental processes, producing a marked decrease in viability of DH individuals. There is, as yet, no satisfactory explanation for these phenomena. To investigate structural elements which might explain such segregational anomalies, we have studied bivalent and trivalent synapsis in pachytene spermatocytes from SH, Ht and DH specimens. Of a total of 80 spermatocyte nuclei microspreads, the following results were obtained: of 16 microspreads from two SH individuals, 20 autosomic bivalents plus the XY bivalent were observed; of 48 microspreads from three Ht individuals, 19 autosomic bivalents, 1 trivalent and an XY bivalent were seen; and of the 16 microspreads from two DH individuals, 21 autosomic bivalents plus the XY bivalent were found. Trivalents analysed showed complete pairing between the short arms of 1a and 1b, and having an apparently normal synaptonemal complex (SC) with lengths of 1 and 2.8 μm. The trivalent SC showed three telomeric ends, corresponding to arms: q1 and q1a; p1 and q1b; and p1a and p1b, with attachment plates to the nuclear envelope of normal organisation. None of the trivalents showed asynapsis or desynapsis between p1a and p1b, nor an association with the XY bivalent. In 70 % of spermatocytes studied, the XY bivalent showed complete pairing between X and Y, with SC formation along the whole length of the Y chromosome. The remaining 30 % showed partial pairing, with an SC length which varied from the common end. Based on these findings and those of previous studies, we discuss: 1.- that the obliged configuration of the trivalent, with SC formation between the short arms of 1a and 1b, helps to assure a quasi normal segregation between 1, 1a and 1b in anaphase I of Ht meiosis; and 2.- that co-existence in trivalents of chromosomes 1, 1a and 1b in Ht i
Cien declaraciones de las Asambleas Plenarias del Episcopado Chileno (1962-2010): Notas para una hermenéutica teológica
Berríos Medel,Fernando;
Teología y vida , 2011, DOI: 10.4067/S0049-34492011000300005
Abstract: in november 2010, the 100th plenary assembly of the bishops' conference of chile was held. on the occasion of this symbolic event, this paper presents the results of a study of the content of statements emanating from these episcopal assemblies. it first takes an overall historical look at the texts, sorted by decade, then moves on to highlight and briefly analyze their main theological points. finally, to conclude, there is a reflection on some ecclesial perspectives coming from the lessons of history and the present challenges to the church.
Page 1 /218913
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.