6 documents found, page 1 of 1
Plastic debris in lakes and reservoirs
Nava, Veronica; Chandra, Sudeep; Aherne, Julian; Alfonso, María B.; Geraldes, Ana Maria; Attermeyer, Katrin; Bao, Roberto; Berger, StellaPlastic debris is thought to be widespread in freshwater ecosystems globally(1). However, a lack of comprehensive and comparable data makes rigorous assessment of its distribution challenging(2,3). Here we present a standardized cross-national survey that assesses the abundance and type of plastic debris (>250 mu m) in freshwater ecosystems. We sample surface waters of 38 lakes and reservoirs, distributed acros...
Plastic debris in freshwater systems worldwide
Nava, Veronica; Aherne, Julian; Alfonso, María B.; Geraldes, Ana Maria; Attermeyer, Katrin; Bao, Roberto; Bartrons, Mireia; Berger, StellaPlastic debris is widespread in freshwater ecosystems, but a rigorous assessment of its global distribution has been hindered by a lack of comprehensive and comparable data. We performed the first standardized global survey of lakes to assess the quantity and type of plastics (>250μm). We included 38 lakes located in 23 different countries distributed across five continents, spanning different environmental gra...
Biodegradable nanoparticles designed for drug delivery: The number of nanoparti...
Mendes, Lívia Palmerston; Delgado, Jorge; Costa, Ângela Daniela Alves; Vieira, Marcelo Sousa; Benfica, Poliana Lopes; Lima, ElianaNanostructured drug delivery systems are based on biocompatible and biodegradable components. Composition, size and membrane surface properties are characteristics that may influence cell viability in cytotoxicity assays. In this work, four nanostructured systems commonly used for drug delivery were prepared and cytotoxicity was evaluated on human lymphocytes and Balb/c 3T3 fibroblasts. The hemolytic potential ...
Preparação e caracterização de diferentes nanotransportadores sem substância ativa
Delgado, Jorge; Mendes, L.; Amaral, Joana S.; Lima, ElianaOs nanotransportadores (NT) são sistemas desenvolvidos à escala nanométrica (< 1μm) sendo usados como veículo de substâncias ativas (SA) [1]. Atualmente a maioria dos trabalhos foca o encapsulamento de fármacos e caracterização dos NT obtidos, sendo escassos os dados relativos a NT sem SA. Este trabalho teve como objectivo a preparação e caracterização de diferentes tipos de NT sem SA: lipossomas (L), nanocápsu...
Preparação e caracterização de nanotransportadores (nanocápsulas, nanoesferas, ...
Delgado, JorgeA nanotecnologia é uma área transversal a vários domínios científicos englobando conceitos da biologia, química, engenharia, matemática, computação entre outros. A nanotecnologia aplicada às ciências farmacêuticas, e em particular ao encapsulamento de fármacos, surgiu há relativamente pouco tempo, mas devido aos recentes e rápidos avanços tecnológicos permitiu a descoberta de novas oportunidades de diagnóstico ...
Survey of special needs in telecommunications for elderly people and people wit...
Costa, Ângela Daniela Alves; Delgado, Jorge; Teixeira, João PauloIn lhis work we have done a sludy af lhe speciaJ needs and exi sting technical telecommunicalions help for elderly people and people with disabi lities. A survey is made af services and projects exist in some national companies af telecommunicalions that provide social, professional and educational inclusion for people with disabiJities and the elderly. Through lhe survey datu in national Insti tule of slatisti...