Papers by Adriana Sanchez
Taxonomic groups have often been recognized on the basis of geographic distinctions rather than a... more Taxonomic groups have often been recognized on the basis of geographic distinctions rather than accurately representing evolutionary relationships. This has been particularly true for temperate and tropical members from the same family. Polygonaceae exemplifies this problem, wherein the woody tropical genera were segregated from temperate members of the family and placed in the subfamily Polygonoideae as two tribes: Triplarideae and Coccolobeae. Modern phylogenetic studies, especially when inferred from many lines of evidence, can elucidate more probable hypotheses of relationships. This study builds on previous work in the family and aims to test the traditional classification of the tropical woody taxa, which have been understudied and undersampled compared to their temperate relatives
Gran parte de la demanda mundial de energía se satisface hoy en día utilizando combustibles fósil... more Gran parte de la demanda mundial de energía se satisface hoy en día utilizando combustibles fósiles, que son una fuente de energía en declive, además de que causan problemas ambientales. Es urgente revisar alternativas, como la gasificación de biomasa para producir hidrógeno, la cual enfrenta los problemas de disponer de un reactor optimizado a mayor escala y de catalizadores adecuados que permitan hacer más eficiente el proceso. En este trabajo se estudiaron ocho catalizadores fluidizables de Ni promovidos con lantano (La) y cerio (Ce) soportados en γ-Al2O3 sintetizados por un método sencillo de co impregnación por reducción directa a 480 °C (atmósfera libre de oxígeno). La promoción de los catalizadores se efectuó variando La y Ce entre 0.5 y 1.0 % en peso, así como el pH de la solución de impregnación (pH 1 y 4). Los catalizadores se caracterizaron utilizando BET, XRD, AA, TPR, TPD, quimisorción de H2, TEM-EDX y FTIR. El desempeño de los catalizadores se probó en un reactor fluid...
Botanical Journal of the Linnean Society
Specimen records are a major source of species information for biodiversity research. However, sp... more Specimen records are a major source of species information for biodiversity research. However, specimen records currently available may be geographically or environmentally biased. Detailed knowledge of biases is useful for understanding and accounting for errors they introduce into analyses of biodiversity patterns. Here we study geographical and environmental biases in online records representing the flora of the Colombian Andes and explore their effect on sample completeness at different spatial scales. We found a strong geographical and environmental sampling bias. Plant records were concentrated close to cities where herbaria and researchers are located. The highlands > 2000 m are better sampled, whereas mid- and lowlands remain poorly sampled (i.e. montane and lowland forest). Sampling completeness (SC) median across the Colombian Andes is < 75% at the scales studied. We explore possible causes of sampling bias, identify critical gaps and priority areas for plant samplin...
Few studies have addressed the evolutionary relationships within Polygonaceae from a global persp... more Few studies have addressed the evolutionary relationships within Polygonaceae from a global perspective. The convoluted taxonomic history of Polygonaceae is a major barrier to understanding evolution in this group, and only portions of it have been included in systematic treatments. Phylogenetic studies have been limited in both taxon sampling and amount of data. Our objective is to identify clades within Polygonaceae and to provide a global estimate of phylogenetic relationships in this morphologically diverse and geographically widespread group. We include a total of 75 species representing approximately 40 of the 55 named genera in the family. We use three chloroplast regions (rbcL, matK, and ndhF) and the ribosomal internal transcribed spacer to understand the phylogenetic relationships in Polygonaceae. Maximum parsimony and maximum likelihood are used to analyze the data. Symmeria is the sister group to remaining Polygonaceae sampled, and there is strong support for this placem...
<p>* <i>Camponotus sexguttatus, Cephalotes ramiphilus, Dolychoderus bidens.</i>... more <p>* <i>Camponotus sexguttatus, Cephalotes ramiphilus, Dolychoderus bidens.</i></p><p>Percentage of occupancy for <i>Triplaris</i> species based on 184 collections (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0143535#pone.0143535.s006" target="_blank">S3 Table</a>).</p
Cancers
Obesity is correlated with increased incidence of breast cancer metastasis; however, the mechanis... more Obesity is correlated with increased incidence of breast cancer metastasis; however, the mechanisms underlying how obesity promotes metastasis are unclear. In a diet-induced obese mouse model, obesity enhanced lung metastasis in both the presence and absence of primary mammary tumors and increased recruitment of myeloid lineage cells into the lungs. In the absence of tumors, obese mice demonstrated increased numbers of myeloid lineage cells and elevated collagen fibers within the lung stroma, reminiscent of premetastatic niches formed by primary tumors. Lung stromal cells isolated from obese tumor-naïve mice showed increased proliferation, contractility, and expression of extracellular matrix, inflammatory markers and transforming growth factor beta-1 (TGFβ1). Conditioned media from lung stromal cells from obese mice promoted myeloid lineage cell migration in vitro in response to colony-stimulating factor 2 (CSF2) expression and enhanced invasion of tumor cells. Together, these resu...
Signo y Pensamiento, Dec 1, 2011
Origen del artículo Este artículo es resultado del análisis de una experiencia de diseño, constru... more Origen del artículo Este artículo es resultado del análisis de una experiencia de diseño, construcción y puesta en marcha del repositorio COMHISTORIA, Archivo Histórico Digital de Comunicación-Suroccidente de Colombia.
e-Motion: Revista de Educación, Motricidad e Investigación, 2021
Las intervenciones asistidas con animales (IAA), en sus diferentes formas, han mostrado beneficio... more Las intervenciones asistidas con animales (IAA), en sus diferentes formas, han mostrado beneficios en las personas a diferentes niveles. En España, profesionales de diferentes ámbitos llevan a cabo este tipo de intervenciones, destacando la ausencia de profesionales de las ciencias del deporte (CAFYD). Este artículo tiene como objetivo valorar la pertinencia del profesional de CAFYD en las IAA, y más concretamente, dentro de las actividades físicas en la naturaleza. La metodología se ha centrado en la realización de una revisión sistemática de la literatura científica sobre sus beneficios en la condición física. Posteriormente se realizado un análisis crítico sobre la relación entre las IAA y las CAFYD, para posteriormente desarrollar la posible inclusión de las IAA como actividades físicas en el medio natural, de acuerdo con las diferentes clasificaciones existentes y atendiendo a las características propias de este tipo de actividades. Los resultados de la revisión de revisiones m...
Intertax, 2020
On 13 February 2019, the OECD released the document ‘Addressing the Tax Challenges of the Digital... more On 13 February 2019, the OECD released the document ‘Addressing the Tax Challenges of the Digitalisation of the Economy Public Consultation Document’ and requested general and specific comments ranging from technical to policy aspects. Under the first pillar, the document revisited the profit allocation and nexus rules with primarily three different actions: the user participation proposal, the marketing intangibles proposal, and a proposal to update the standard of ‘physical presence’ with a ‘substantial economic presence’ concept. The second pillar, which is focused on the remaining base erosion and profit-shifting (BEPS) issues sets forth an income inclusion rule and rules for the taxation of tax eroding payments. This article analyses these proposals from the perspective of developing countries including low income economies (LIEs), lower-middle income economies (LMIEs) and upper-middles income economies (UMIEs) as classified by the World Bank. Emphasis is given to the administr...
Floods are among the most devastating events that affect primarily tropical, archipelagic countri... more Floods are among the most devastating events that affect primarily tropical, archipelagic countries such as the Philippines. With the current predictions of climate change set to include rising sea levels, intensification of typhoon strength and a general increase in the mean annual precipitation throughout the Philippines, it has become paramount to prepare for the future so that the increased risk of floods on the country does not translate into more economic and human loss. Field work and data gathering was done within the framework of an internship at the former German Technical Cooperation (GTZ) in cooperation with the Local Government Unit of Ormoc City, Leyte, The Philippines, in order to develop a dynamic computer based flood model for the basin of the Pagsangaan River. To this end, different geo-spatial analysis tools such as PCRaster and ArcGIS, hydrological analysis packages and basic engineering techniques were assessed and implemented. The aim was to develop a dynamic flood model and use the development process to determine the required data, availability and impact on the results as case study for flood early warning systems in the Philippines. The hope is that such projects can help to reduce flood risk by including the results of worst case scenario analyses and current climate change predictions into city planning for municipal development, monitoring strategies and early warning systems. The project was developed using a 1D-2D coupled model in SOBEK (Deltares Hydrological modelling software package) and was also used as a case study to analyze and understand the influence of different factors such as land use, schematization, time step size and tidal variation on the flood characteristics. Several sources of relevant satellite data were compared, such as Digital Elevation Models (DEMs) from ASTER and SRTM data, as well as satellite rainfall data from the GIOVANNI server (NASA) and field gauge data. Different methods were used in the attempt to partially calibrate and validate the model to finally simulate and study two Climate Change scenarios based on scenario A1B predictions. It was observed that large areas currently considered not prone to floods will become low flood risk (0.1-1 m water depth). Furthermore, larger sections of the floodplains upstream of the Lilo- an’s Bridge will become moderate flood risk areas (1 - 2 m water depth). The flood hazard maps created for the development of the present project will be presented to the LGU and the model will be used to create a larger set of possible flood prone areas related to rainfall intensity by GTZ’s Local Disaster Risk Management Department and to study possible improvements to the current early warning system and monitoring of the basin section belonging to Ormoc City; recommendations about further enhancement of the geo-hydro-meteorological data to improve the model’s accuracy mainly on areas of interest will also be presented at the LGU.
The FASEB Journal, 2015
Our objective is to test the dictum that secretory ameloblasts cannot divide. Dental biology text... more Our objective is to test the dictum that secretory ameloblasts cannot divide. Dental biology textbooks often present this idea without citation or evidence; its source seems to be studies of rodent incisors from the 1960's. However, rodent incisors are ever-growing, and not acceptable models for enamel epithelia in other mammals. There are two reasons to expect that ameloblasts divide. First, recent studies show that tensile forces induce mitosis in epithelia, and enamel epithelia likely undergo tension as enamel is deposited and the surface area of the growing crown expands. Second, we now know that ameloblasts are subject to the same biorhythms that synchronize proliferation of osteoblasts. If ameloblast division is also coordinated by the brain and occurs at night, it is unlikely to have been observed since most experimental protocols occur in daylight. To test the hypothesis, we first measured enamel area from surface and enamel-dentine junction in Saimiri sciureus tooth sections. We also measured ena...
This is the author’s version of a work that was submitted/accepted for pub-lication in the follow... more This is the author’s version of a work that was submitted/accepted for pub-lication in the following source:
Digital modeling, integrated project delivery and industry transformation: An Australian case stu... more Digital modeling, integrated project delivery and industry transformation: An Australian case study. Buildings, 4(3), pp. 453-466.
Integrating Information in Built Environments, 2017
Water, 2021
Riparian zones (RZs) are transitional environments at the interface between land and freshwater e... more Riparian zones (RZs) are transitional environments at the interface between land and freshwater ecosystems, which are important in terms of socioecological services. In this work, we report a bibliometric-based analysis to unveil the knowledge structure and actors of scientific production on riparian zones for the first 20 years of the 21st century. We performed a literature search, querying for riparian zones publications for the period 2001–2020. The selected 1171 bibliographic records were analyzed by extracting several bibliometric indices of reporting tendencies, location, collaboration dynamics, and top topics. Results show that RZs publications increased considerably from 2001 to 2020, and top journals publishing on the subject are from the water, environmental management, and ecology areas. The US, China, Brazil, and Canada were the most productive countries, while the institutions with higher productivity were the Chinese Academy of Sciences and Oregon University. In terms ...
Construction scholars suggest that procurement processes can be used as mechanisms to change cons... more Construction scholars suggest that procurement processes can be used as mechanisms to change construction industry practices. This paper discusses industry changes as a response to the calls for integration of sustainability ideals into construction practices. Because major infrastructure construction has been identified as a key producer of greenhouse gas emissions (GHGE), this study explores collaborative procurement models that have been used to facilitate mitigation of GHGE. The study focuses on the application of non-price incentives and rewards that work together as a binary mechanism. Data were collected using mixed-methods: government document content analysis was complemented with data collected through focus groups and individual interviews with both clients and contractors. This report includes examples of greening procurement agendas for three Australian road authorities relating to collaborative procurement project delivery models. Three collaborative procurement models...
Integrating Information in Built Environments, 2017
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Papers by Adriana Sanchez