596 research outputs found
SUSTENTABILIDADE AMBIENTAL E DESIGN DE MODA NA PÓS-MODERNIDADE
Este artigo analisa o contexto histórico social em que surge o conceito de sustentabilidade ambiental, a sua relação com a cultura da pós-modernidade e a adequação do produto de moda ao desenvolvimento sustentável
A moda no contexto da sustentabilidade
Este artigo tem como objetivo levantar o estado da arte da moda no contexto da sustentabilidade. A Moda está relacionada com o novo, com o efêmero, com mudanças cada vez mais rápidas, enquanto expressa em produtos, tem uma importância cultural e econômica significativa para a sociedade, por esta razão deve-se questionar e desafiar as suas convenções e os modelos de negócios. Pois, o sistema de moda tem gerado, em especial, grandes impactos ambientais poucos conhecidos pela sociedade. Logo, para que ocorra efetivamente uma mudança significativa no sistema de moda é fundamental uma mudança cultural na produção e no consumo, reduzindo ou eliminando os impactos socioambientais. Conclui-se que há oportunidades do sistema de moda, principalmente, a indústria de transformação, gerar produtos mais sustentáveis com equilÃbrio nas relações socioambientai
Sistema colaborativa para monitoramento e geolocalização de problemas sociais e urbanos
Este artigo apresenta um sistema colaborativo para monitoramento de problemas sociais e urbanos. O trabalho tem por objetivo desenvolver um sistema que mapeie os problemas sociais e urbanos através de geolocalização e disponibilizar estas informações para os usuários que se encontram na região. Os problemas encontrados são relacionados a falta de segurança e informação a respeito das áreas urbanas. Para o desenvolvimento do trabalho foram utilizados conceitos da colaboração, como a gestão de informação colaborativa, pois são os usuários da aplicação que irão gerar as ocorrências e cadastrá-las. Ainda, durante o desenvolvimento foram observadas as caracterÃsticas voltadas a percepção de um sistema colaborativo para dispositivos móveis
AmÃlcar Herrera y la cuestión minera en Argentina
AmÃlcar Herrera fue unos de los más lúcidos representantes del Pensamiento Latinoamericano en Ciencia, TecnologÃa, Desarrollo y Dependencia (PLACTED). En este trabajo se propone rescatar la mirada que como geólogo desarrolló en torno a la problemática minera y su relación con la construcción de un Proyecto Nacional y Regional. Con esta óptica y con el objetivo de resignificar y repensar las polÃticas del sector minero en Argentina, se analizan la relevancia de esta actividad en el paÃs, los conceptos de recursos y reservas minerales y se presentan una serie de propuestas para pensar en posibles rumbos que permitan avanzar sobre nuevas formas de practicar la actividad minera en Argentina y la región.AmÃlcar Herrera was one of the most lucid representatives of Latin American Thought in Science, Technology, Development and Dependency (PLACTED). In this work it is proposed to rescue the view that as a geologist he developed around the mining problem and its relationship with the construction of a National and Regional Project. With this perspective and with the aim of re-signifying and rethinking the policies of the mining sector in Argentina, the relevance of this activity in the country, the concepts of mineral resources and reserves are analyzed and a series of proposals are presented to think about possible directions that allow progress on new ways of practicing mining in Argentina and the region.Fil: Kohler, MarÃa Constanza. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; ArgentinaFil: Guerriero, Lucas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentina. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - La Plata; ArgentinaFil: Barros Cortes, Facundo. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentin
AmÃlcar Herrera e a questão mineira na Argentina
AmÃlcar Herrera fue unos de los más lúcidos representantes del Pensamiento Latinoamericano en Ciencia, TecnologÃa, Desarrollo y Dependencia (PLACTED). En este trabajo se propone rescatar la mirada que como geólogo desarrolló en torno a la problemática minera y su relación con la construcción de un Proyecto Nacional y Regional. Con esta óptica y con el objetivo de resignificar y repensar las polÃticas del sector minero en Argentina, se analizan la relevancia de esta actividad en el paÃs, los conceptos de recursos y reservas minerales y se presentan una serie de propuestas para pensar en posibles rumbos que permitan avanzar sobre nuevas formas de practicar la actividad minera en Argentina y la región.AmÃlcar Herrera was one of the most lucid representatives of Latin American Thought in Science, Technology, Development and Dependency (PLACTED). In this work it is proposed to rescue the view that as a geologist he developed around the mining problem and its relationship with the construction of a National and Regional Project. With this perspective and with the aim of re-signifying and rethinking the policies of the mining sector in Argentina, the relevance of this activity in the country, the concepts of mineral resources and reserves are analyzed and a series of proposals are presented to think about possible directions that allow progress on new ways of practicing mining in Argentina and the region.AmÃlcar Herrera foi um dos mais lúcidos representantes do Pensamento Latino-Americano em Ciência, Tecnologia, Desenvolvimento e Dependência (PLACTED). Neste trabalho, propomos resgatar a perspectiva de AmÃlcar, que, como geólogo, desenvolveu seu pensamento em torno do problema da mineração e de sua relação com a construção de um Projeto Nacional e Regional. Com essa perspectiva e com o objetivo de ressignificar e repensar as polÃticas do setor de mineração na Argentina, o presente artigo se volta a pensar a relevância dessa atividade no paÃs, analisa os conceitos de recursos e reservas minerais e apresenta uma série de propostas para pensar possÃveis rumos que permitam avançar em novas formas para a prática de mineração na Argentina e região.Cátedra Libre Ciencia, PolÃtica y Socieda
Cold-induced changes in plasma signaling lipids are associated with a healthier cardiometabolic profile independently of brown adipose tissue
Cold exposure activates brown adipose tissue (BAT) and potentially improves cardiometabolic health
through the secretion of signaling lipids by BAT. Here, we show that 2 h of cold exposure in young adults increases
the levels of omega-6 and omega-3 oxylipins, the endocannabinoids (eCBs) anandamide and docosahexaenoylethanolamine,
and lysophospholipids containing polyunsaturated fatty acids. Contrarily, it decreases
the levels of the eCBs 1-LG and 2-LG and 1-OG and 2-OG, lysophosphatidic acids, and
lysophosphatidylethanolamines. Participants overweight or obese show smaller increases in omega-6 and
omega-3 oxylipins levels compared to normal weight. We observe that only a small proportion (~4% on
average) of the cold-induced changes in the plasma signaling lipids are slightly correlated with BAT volume.
However, cold-induced changes in omega-6 and omega-3 oxylipins are negatively correlated with adiposity,
glucose homeostasis, lipid profile, and liver parameters. Lastly, a 24-week exercise-based randomized
controlled trial does not modify plasma signaling lipid response to cold exposure.Junta de AndalucÃa, ConsejerÃa de Transformación Económica, Industria, Conocimiento y Universidades Dirección
General de Investigación y Transferencia del Conocimiento (ref. P18-RT-4455, ref. SOMM17/6107/UGR, and DOC 01151) and European Regional
Development Funds (ERDF)Spanish Ministry of Economy and Competitiveness via the Fondo de Investigación Sanitaria del Instituto de Salud Carlos III (PI13/01393)PTA-12264, Retos de la Sociedad (DEP2016-79512-R)Spanish Ministry of Education (FPU19/01609)Fundación Iberoamericana de Nutrición (FINUT)Redes Temáticas de Investigación Cooperativa RETIC (Red SAMID RD16/0022)AstraZeneca HealthCare FoundationUniversity of Granada Plan Propio de Investigación 2016 Excellence actions: Unit of Excellence on Exercise and Health (UCEES)Chinese Scholarship Council fellowships (no. 201707060012 and no. 201607060017)Grant for the requalification of the Spanish university system from the Ministry of Universities of the Government of Spain, financed by the European Union, NextGeneration EU (MarÃa Zambrano program, reference RR_C_2021_04
The Spitzer c2d Survey of Weak-Line T Tauri Stars. III. The Transition from Primordial Disks to Debris Disks
We present 3.6 to 70 {\mu}m Spitzer photometry of 154 weak-line T Tauri stars
(WTTS) in the Chamaeleon, Lupus, Ophiuchus and Taurus star formation regions,
all of which are within 200 pc of the Sun. For a comparative study, we also
include 33 classical T Tauri stars (CTTS) which are located in the same star
forming regions. Spitzer sensitivities allow us to robustly detect the
photosphere in the IRAC bands (3.6 to 8 {\mu}m) and the 24 {\mu}m MIPS band. In
the 70 {\mu}m MIPS band, we are able to detect dust emission brighter than
roughly 40 times the photosphere. These observations represent the most
sensitive WTTS survey in the mid to far infrared to date, and reveal the
frequency of outer disks (r = 3-50 AU) around WTTS. The 70 {\mu}m photometry
for half the c2d WTTS sample (the on-cloud objects), which were not included in
the earlier papers in this series, Padgett et al. (2006) and Cieza et al.
(2007), are presented here for the first time. We find a disk frequency of 19%
for on-cloud WTTS, but just 5% for off- cloud WTTS, similar to the value
reported in the earlier works. WTTS exhibit spectral energy distributions
(SEDs) that are quite diverse, spanning the range from optically thick to
optically thin disks. Most disks become more tenuous than Ldisk/L* = 2 x 10^-3
in 2 Myr, and more tenuous than Ldisk/L* = 5 x 10^-4 in 4 Myr.Comment: 40 pages, 13 figures, 4 tables. Accepted for publication in ApJ on
September 20, 201
Genome sequence of the button mushroom Agaricus bisporus reveals mechanisms governing adaptation to a humic-rich ecological niche
Agaricus bisporus is the model fungus for the adaptation, persistence, and growth in the humic-rich leaf-litter environment. Aside from its ecological role, A. bisporus has been an important component of the human diet for over 200 y and worldwide cultivation of the "button mushroom" forms a multibillion dollar industry. We present two A. bisporus genomes, their gene repertoires and transcript profiles on compost andduringmushroomformation.The genomes encode a full repertoire of polysaccharide-degrading enzymes similar to that of wood-decayers. Comparative transcriptomics of mycelium grown on defined medium, casing-soil, and compost revealed genes encoding enzymes involved in xylan, cellulose, pectin, and protein degradation aremore highly expressed in compost. The striking expansion of heme-thiolate peroxidases and β-etherases is distinctive from Agaricomycotina wood-decayers and suggests a broad attack on decaying lignin and related metabolites found in humic acid-rich environment. Similarly, up-regulation of these genes together with a lignolytic manganese peroxidase, multiple copper radical oxidases, and cytochrome P450s is consistent with challenges posed by complex humic-rich substrates. The gene repertoire and expression of hydrolytic enzymes in A. bisporus is substantially different from the taxonomically related ectomycorrhizal symbiont Laccaria bicolor. A common promoter motif was also identified in genes very highly expressed in humic-rich substrates. These observations reveal genetic and enzymatic mechanisms governing adaptation to the humic-rich ecological niche formed during plant degradation, further defining the critical role such fungi contribute to soil structure and carbon sequestration in terrestrial ecosystems. Genome sequence will expedite mushroom breeding for improved agronomic characteristics
Primordial Circumstellar Disks in Binary Systems: Evidence for Reduced Lifetimes
We combine the results from several multiplicity surveys of pre-main-sequence
stars located in four nearby star-forming regions with Spitzer data from three
different Legacy Projects. This allows us to construct a sample of 349 targets,
including 125 binaries, which we use to to investigate the effect of companions
on the evolution of circumstellar disks. We find that the distribution of
projected separations of systems with Spitzer excesses is significantly
different (P ~2.4e-5, according to the KS test for binaries with separations <
400 AU) from that of systems lacking evidence for a disk. As expected, systems
with projected separations < 40 AU are half as likely to retain at least one
disk than are systems with projected separations in the 40-400 AU range. These
results represent the first statistically significant evidence for a
correlation between binary separation and the presence of an inner disk (r ~ 1
AU). Several factors (e.g., the incompleteness of the census of close binaries,
the use of unresolved disk indicators, and projection effects) have previously
masked this correlation in smaller samples. We discuss the implications of our
findings for circumstellar disk lifetimes and the formation of planets in
multiple systems.Comment: Accepted for publication by ApJ
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