La thèse porte sur l’institutionnalisation de la proximité dans les marchés agroalimentaires et la place qu’occupent un certain nombre d’intermédiaires non économiques (salariés d’association, chercheurs, membres du ministère de l’Agriculture, conseillers des chambres d’agriculture) dans ce processus. En variant les échelles d’enquête, du national au départemental, et en articulant les méthodes qualitatives et quantitatives, ce travail pointe le paradoxe que constitue le développement de ces agents à mesure que la proximité est définie et objectivée comme caractéristique vertueuse de la relation marchande. A partir d’une sociologie des institutions marchandes attentive à l’étude concomitante des conditions historiques et sociales de la construction des marchés et de leurs logiques concrètes de fonctionnement, il s’agit de restituer les luttes pour le monopole de la définition légitime des « circuits courts » entendus comme catégorie d’organisation marchande. Dans un contexte de reconfiguration des alliances qui encadraient et hiérarchisaient jusqu’alors les marchés agroalimentaires, l’analyse montre que le rapprochement des agriculteurs et des consommateurs dans les échanges marchands repose sur la réduction de leur distance sociale et politique. Mais la structuration des « circuits courts » n’est finalement permise qu’au prix de l’autonomisation d’agents d’intermédiations qui contribuent à les légitimer et à les définir, dans le même temps qu’ils tendent à rendre invisible leurs propres pratiques. En accédant à une position réticulaire sur ces marchés, ces intermédiaires participent ainsi à redéfinir les frontières de l’espace des producteurs. / The dissertation deals with the institutionalisation of proximity in agri-food markets and the place occupied in this process by non-economic intermediaries (employees of associations, researchers, members of staff from the ministry of Agriculture, advisers of the chambers of agriculture). By varying the scales of investigation, from the national to the departmental level, and by articulating qualitative and quantitative methods, this work points out the paradox that constitute the development of those intermediary agents, as proximity is progressively defined and objectified as a virtuous component of the merchant relationship. On the basis of a sociology of merchant institutions attentive to study concurrently historical and social conditions of market constructions and their specific operating logics, we aim to restore the struggles for the monopoly of the legitimate definition of “short supply chain”, understood as a category of merchant organization. In the context of reconfiguration of alliances which previously framed and ranked agri-food markets, the analysis shows that the linking of farmers and consumers in market exchange rests on the reduction of their social and political distance. But finally, the structuration of “short supply chain” is only allowed because of the self-empowerment of intermediary agents contributing to legitimize and define them, as in the same time they make invisible their own practices. Therefore, by gaining a reticular position on those markets, the intermediaries contribute to redefine the frontiers of the producers’ space.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-03T21:41:35Z No. of bitstreams: 1 CarlosEduardoCostaDeCampos_TESE.pdf: 4426338 bytes, checksum: 67b2b7d3f8f51f7db4fd599c34e428de (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-04T19:48:12Z (GMT) No. of bitstreams: 1 CarlosEduardoCostaDeCampos_TESE.pdf: 4426338 bytes, checksum: 67b2b7d3f8f51f7db4fd599c34e428de (MD5) / Made available in DSpace on 2016-02-04T19:48:12Z (GMT). No. of bitstreams: 1 CarlosEduardoCostaDeCampos_TESE.pdf: 4426338 bytes, checksum: 67b2b7d3f8f51f7db4fd599c34e428de (MD5) Previous issue date: 2015-02-23 / As Savanas amaz?nicas ocorrem em manchas disjuntas por extensas ?reas de floresta nos Estados do Amap?, Amazonas, Par? e Roraima. Para essas ?reas ? reconhecida varia??o consider?vel na composi??o de esp?cies da anurofauna entre as localidades e as fitofisionomias das Savanas amaz?nicas; no entanto, em fun??o da car?ncia de estudos ecol?gicos, especialmente sobre comportamento reprodutivo, uma amostragem sistem?tica, especificamente na Savana amapaense, ? relevante na Amaz?nia Oriental. Nessa perspectiva, foi estudada uma ?rea de Savana no Estado do Amap? quanto ? composi??o, ecologia e comportamento reprodutivo de anf?bios anuros. Para as amostragens dos anuros, foram realizadas 24 excurs?es para observac?es e/ou coletas, de janeiro de 2009 a dezembro de 2010 em cada fitofisionomia (Savana gram?neo-lenhosa, Savana gram?neo-lenhosa arbustiva, Savana parque e Savana arb?rea); para as an?lises do comportamento reprodutivo foram feitas observa??es durante o per?odo de janeiro a dezembro de 2013, com dura??o de quatro dias consecutivos. As amostragens foram realizadas atrav?s de busca ativa e auditiva ao longo de 20 parcelas de 100x50 metros. Foram registradas 21 esp?cies de anuros, incluindo quatro novos registros de ocorr?ncia para o Estado do Amap?: Dendropsophus walfordi, Scinax fuscomarginatus, Pseudopaludicola boliviana e Elachistocleis helianneae. A an?lise de vari?ncia de Kruskal-Wallis revelou diferen?as significativas quanto a riqueza e a diversidade de esp?cies entre as fitofisionomias (p < 0.05). A an?lise de similaridade de Bray Curtis reconheceu as fitofisionomias em tr?s grupos: Savana arb?rea, Savana gram?neo lenhosa e gram?neo lenhosa arbustiva, e Savana parque. Atrav?s do Ordenamento por escalonamento n?o-m?trico multidimensional, a comunidade de anuros resultou em agrupamentos distintos nas tr?s fitofisionomias amostradas, com diferen?as significativas (ANOSIM, R = 0.823; p < 0.001), indicando diferen?a na composi??o de esp?cies. No estudo de ecologia de comunidades, os valores obtidos para largura dos nichos espacial, temporal e tr?fico sugerem que as esp?cies de anuros da Savana amapaense ? composta predominantemente por esp?cies generalistas. As an?lises de modelos nulos indicaram a ocorr?ncia de estrutura??o na comunidade quanto aos nichos temporal e tr?fico, indicando influ?ncia significativa de fatores ecol?gicos contempor?neos nesse processo. A aus?ncia de estrutura quanto ao nicho espacial pode ser explicada pela segrega??o espacial na distribui??o e ocupa??o dos anuros nas diferentes fitofisionomias da Savana amapaense, resultante de especializa??es. As estrat?gias reprodutivas, 11 esp?cies de anuros foram classificadas com padr?o de reprodu??o prolongado, intrinsecamente ligado ao per?odo chuvoso e ao modo reprodutivo da maioria das esp?cies, que apresentaram desova em corpos d??gua l?nticos. Foram registrados seis modos reprodutivos, com cuidado parental para as esp?cies Leptodactylus macrosternum e L. podicipinus, que apresentaram modos reprodutivos caracterizados pelas desovas em ninhos de espuma. Quanto ?s estrat?gias reprodutivas comportamentais, a estrat?gia do macho vocalizador foi constatada em todas as esp?cies de anuros; a estrat?gia do macho sat?lite foi registrada apenas para as esp?cies D. walfordi, Hypsiboas multifasciatus, S. nebulosus e S. fuscomarginatus; a procura ativa por f?meas foi registrada para as esp?cies Phyllomedusa hypochondrialis e L. fuscus e, a estrat?gia de macho deslocador ocorreu apenas em Rhinella major e R. margaritifera. Dos comportamentos reprodutivos registrados, a exibi??o da regi?o gular e do saco vocal est? relacionado ao comportamento de corte e territorialidade exibido pelos machos. Al?m dos comportamentos de corte, sinais visuais associados foram registrados para os anuros da Savana amapaense. / The Amazon savannas occur as isolated patches throughout extensive areas of forest in the states of Amap?, Amazonas, Par?, and Roraima. There is a considerable variation in the composition of anuran assemblages in the localities and phytophysiognomies of Amazon savannas and given the absence of studies on reproductive behavior, a systematic and geographically wide sampling has been carried out in the Amap? savanna, located in the Eastern Amazon. The study was conducted in a savanna area in the state of Amap? to examine the composition, ecology, and reproductive behavior of anuran amphibians. We carried out 24 field trips in each phytophysiognomy (gramineous-woody savana, gramineous-herbaceous-woody savana, park savana, and arboreal savanna); for analysis of reproductive behavior observations were made during the period January to December 2013, lasting four consecutive days. Samples were collected by active and acoustic search along 20 plots of 100x50 meters. Twenty-one anuran species were recorded, of which four are new records for the state of Amap?: Dendropsophus walfordi, Scinax fuscomarginatus, Pseudopaludicola boliviana e Elachistocleis helianneae. The KruskalWallis ANOVA revealed significant differences between richness and species diversity in the phytophysiognomies (p < 0.05). The Bray-Curtis similarity coefficient divided the phytophysiognomies into three groups: arboreal savana, gramineous-woody savanna and gramineous-herbaceous-woody savanna, and park savanna. According to the non-metric multidimensional scaling, the structure of the anuran community resulted in a separation into three phytophysiognomies, with significant differences in the structure of communities (ANOSIM, R = 0.823; p < 0.001). In the study of community ecology, the results obtained for spatial, temporal, and trophic niche breadth suggest that the assemblage of anurans of the Amap? savanna is not composed of predominantly generalist species. Also, the presence of other specialist anurans may explain the processes of speciation associated with the isolation of habitats, resulting in heterogeneity and spatial discontinuity in the phytophysiognomies with open formations. The null model analysis revealed that the community is structured based on temporal and trophic niche, indicating a significant influence of contemporary ecological factors on the assemblage. The absence of structure based on spatial niche might be explained by the spatial segregation in the distribution and occupation of anurans in the different phytophysiognomies of the Amap? savanna. Regarding the reproductive behavior of anurans, 11 species were classified as having a long breeding season, intrinsically associated with the rainy season and the reproductive mode of most species that lay egg clutches in lentic water bodies. Six reproductive modes were recorded and parental care was observed in Leptodactylus macrosternum and L. podicipinus, whose reproductive mode is characterized by foam nests. Regarding behavioral reproductive strategies, calling males were observed in all species of anurans, satellite males were recorded only for D. walfordi, Hypsiboas multifasciatus, S. nebulosus and S. fuscomarginatus; active search for females was observed for Phyllomedusa hypochondrialis and L. fuscus, and male displacement was recorded only for Rhinella major and R. margaritifera. Of the reproductive behaviors observed, throat and vocal sac display is associated with courtship and territorial behavior exhibited by males. In addition to courtship behavior, visual signals associated with courtship strategies were recorded for the anurans of the Amap? savanna.

Made available in DSpace on 2015-03-13T17:08:25Z (GMT). No. of bitstreams: 1 MariaFAM_reduzido_Opdf.pdf: 5528332 bytes, checksum: 355ca104cbad452325371850cf8f8051 (MD5) Previous issue date: 2009-10-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The Amap? State has an important natural lake system, known as The Amap? Lakes Region . Most of these lakes are on the southern part of Amap? s coastal plain, which has 300 km of extension and it s composed by holocenic sediments deposited at the northern part of Amazon River to the Orange Cape located on the northern part of Amap? state. This region is under influence of the Amazon River discharge which is the largest liquid discharge of about 209.000 m?/s and biggest sediment budget discharged on the ocean in the order 6.108 ton per day. The climate is influenced by the Intertropical Convergence Zone and El Ni?o Southern Oscillation which act mainly under precipitation, nebulosity, local rivers and tidal hidrology. In this region lake belts are Ocidental, Oriental and Meridional Lake Belts. The last one is formed by the by the lakes Comprido de Cima, Botos, Bacia, Lod?o, Ventos, Mutuco and Comprido de Baixo. These lakes are the closest to the Araguari River and are characterized by pelitic sedimentation associated with fluvial and estuarine flood plains under influence of tides. The lakes are interconnected, suffer influence of flood pulses from the Tartarugal, Tartarugalzinho and Araguari rivers and the hydrodynamic and morphodynamic know edge is poor. Volume and area reduction, natural eutrophication, anthophic influence, hidrodynamic alterations, morphological changes and are factors which can contribute to the closing of such lakes on the Meridional Lake Belt. This belt is inside the boundaries of the Biological Reserve of Piratuba Lake, created in 1980 for integral protection. Due to the fragility of the environment together with the poor knowledge of the system and with the study area relevancy it is necessary to know the hydrodynamic and geoenvironmental processes. This work aims the characterization of morphodynamic and hydrodynamic processes in order to understand the geoambiental context of the Meridional Lake Belt, from the Comprido de Baixo Lake to the dos Ventos Lake, including the Tabaco Igarape. Methodology was based on the hydrodynamic data acquisition: liquid discharge (acoustic method), tides, bathymetry and the interpretation of multitemporal remote sensing images, integrated in a Geographic Information System (GIS). By this method charts of the medium liquid discharges of Lake Mutuco and Tabacco Igarape the maximum velocity of flow were estimated in: 1.1 m/s, 1.6 m/s and 1.6 m/s (rainy season) and 0.6 m/s, 0.6 m/s and 0.7 m/s (dry period), the maximum flow in: 289 m?/s, 297 m?/s and 379 m?/s (rainy season) and 41 m?/s , 79 m?/s and 105 m?/s (dry period), respectively. From the interpretation of multitemporal satellite images, maps were developed together with the analysis of the lakes and Tobaco Igarape evolution from 1972 to 2008, and were classified according to the degree of balance in the area: stable areas, eutrophic areas, areas of gain, and eroded areas. Troughout analysis of the balance of areas, it was possible to quantify the volume of lake areas occupied by aquatic macrophytes. The study sought to understand the hydrodynamic and morphodynamic processes occurring in the region, contributing to the elucidation of the processes which cause and/or favor geoenvironmental changes in the region; all such information is fundamental to making the management of the area and further definition of parameters for environmental monitoring and contributing to the development of the management plan of the Biological Reserve of Lake Piratuba. The work activities is a part of the Project "Integration of Geological, geophysical and geochemical data to Paleogeographic rebuilding of Amazon Coast, from the Neogene to the Recent / O Estado do Amap? abrange um importante sistema lacustre natural, conhecido como A Regi?o dos Lagos do Amap? . A maioria desses lagos est? concentrada na parte sul da plan?cie costeira do Amap?. ? uma regi?o altamente influenciada pelas descargas do rio Amazonas, este considerado o maior em descarga l?quida, com cerca de 209.000 m?/s e 6.108 ton.dia-1 de aporte de sedimentos ao Oceano. Esta regi?o tamb?m ? fortemente influenciada da Zona de Converg?ncia Intertropical (ZCIT) e Oscila??o Sul-El Nino (OSEN ou ENSO) que atuam principalmente sobre precipita??o, nebulosidade, hidrologia dos rios locais e mar?. Nesta regi?o, est? localizado os principais cintur?es lacustre do Amap?: Cintur?o Lacustre Ocidental, Cintur?o Lacustre Oriental e Cintur?o Lacustre Meridional. Este ?ltimo cintur?o ? formados pelos Lagos dos Botos, Lago Comprido de Cima, Lago da Bacia, Lago Lod?o, Lago dos Ventos , Lago Mutuco e o Lago Comprido de Baixo. S?o poucos conhecidos do ponto de vista da hidrodin?mica e morfodin?mica, e correm o risco de ter seu funcionamento natural alterado, antes mesmo de serem estudados. Fatores como a redu??o do volume de ?rea, eutrofiza??o por vegeta??o aqu?tica, antropiza??o, altera??es na hidrodin?mica (vaz?o), s?o fatores j? evidenciados e podem contribuir significativamente para seu desaparecimento do Cintur?o Lacustre Meridional. Este Cintur?o est? dentro dos limites da Reserva Biol?gica do Lago Piratuba, criada em 1980, cuja finalidade ? de conserva??o e de prote??o integral. O objetivo principal deste trabalho foi a caracteriza??o dos processos morfodin?micos e hidrodin?micos, visando entender o funcionamento geoambiental do Cintur?o Lacustre Meridional, desde o Lago Comprido de Baixo at? o Lago dos Ventos, incluindo o Igarap? do Tabaco. Teve como base metodol?gica a aquisi??o de dados de descarga l?quida, mar?s, batimetria e a interpreta??o multitemporal de imagens de sensores remotos, integrados em ambiente de Sistema de Informa??o Geogr?fica (SIG). Foram estimados valores m?ximos das velocidades do fluxo e vaz?es do Lago Mutuco e Igarap? Tabaco: 1,173 m/s, 1,685 e 1,684 m/s (per?odo chuvoso) e 0,692 m/s, 0,626 m/s e 0,722 m/s (per?odo seco); as m?ximas vaz?es em: 289 m?/s, 297 m?/s e 379 m?/s (per?odo chuvoso) e 41 m?/s, 79 m?/s e 105 m?/s (per?odo seco), respectivamente. A partir da interpreta??o das imagens de sat?lites, foram elaborados mapas de an?lise multitemporal da evolu??o dos Lagos e Igarap? Tabaco de 1972 a 2008, e foram classificados de acordo com o grau de balan?o de ?rea (km? e m?) em: ?reas est?veis, ?reas eutrofizadas, ?reas de ganho, ?reas erodidas. Os resultados mostram que os tr?s lagos estudados e o Igarap? Tabaco, possuem din?micas diferentes. De 1972 at? 1999, os Lagos sofreram poucas varia??es de ?reas eutrofizadas, ?reas de ganho e ?reas est?veis. Nos per?odos de 1999 at? 2008, a din?mica mudou completamente e os Lagos tendem a reduzir consideravelmente sua ?rea ?til, e os Lagos dos Ventos e Comprido de Baixo, s?o os Lagos mais afetados pela presen?a e ocupa??o das margens pelas macr?fitas aqu?ticas: entre 1972 a 1999, o Lago dos Ventos teve uma redu??o de ?rea de 530401,1m?, de 1999 para 2008, teve redu??o de mais 2038595,3m?, equivalente a mais de 50% de ?rea reduzida em 36 anos. O Lago Comprido de Baixo, teve uma din?mica diferente de balan?o de ?rea de 1972 a 1999, sua ?rea teve aumento significativo nesse per?odo, de 2634011,8m? em 1972, para 1999 obteve um ganho de 365512,9m? aumentando para 2999524,7m?. De 1999 para 2008, sua ?rea total foi reduzida em 1225492,0m?, o equivalente a aproximadamente 60% de ?rea ocupada pelas macr?fitas aqu?ticas. Esses estudos buscaram entender os processos morfodin?micos e hidrodin?micos ocorrentes na regi?o dos Lagos e Igarap? Tabaco, com vista a contribuir na elucida??o dos processos que ocasionam e/ou favorecem as modifica??es geoambientais na regi?o. Todas essas informa??es s?o fundamentais para as tomadas de decis?es de gest?o da ?rea, defini??o posterior de par?metros para monitoramento ambiental e contribui??o para a elabora??o do plano de manejo da Reserva Biol?gica do Lago Piratuba. O desenvolvimento das atividades est? inserido no ?mbito do Projeto AMASIS, e teve apoio dos projetos PETRORISCO-FASE-2 e HIDROSEMA (REDE 05 PETROMAR/2007/CTPETRO/FINEP/PETROBRAS/CNPq)de caracter?sticas multidisciplinares e interinstitucional, em temas envolvendo o monitoramento ambiental

Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-01-16T10:22:16Z No. of bitstreams: 1 2015 - Tatiana da Concei??o Gon?alves.pdf: 5453125 bytes, checksum: 99e70cebe492e0864542a551ea8ebf1c (MD5) / Made available in DSpace on 2017-01-16T10:22:16Z (GMT). No. of bitstreams: 1 2015 - Tatiana da Concei??o Gon?alves.pdf: 5453125 bytes, checksum: 99e70cebe492e0864542a551ea8ebf1c (MD5) Previous issue date: 2015-04-28 / Programa de P?s Gradua??o em Educa??o Agr?cola da UFRuralRJ - UFRRJ / The teaching of Portuguese language applied by the contemporary teacher cannot be dissociated from the guidance and influences of The National Curricular Parameters and from the theoretical postulates of the textual linguistic, which are premised on the doctrinal basis of Mikhail Bakhtin. At the same time, it is important that this teacher organizes his practice from didactical and pedagogical guidelines of teaching through textual genres, which crosses the bias of the didactical sequences of Bernard Scheneuwly and Joaquim Dolz as well as the theoretical interactionist idea of Levy Vygotsky. It is also necessary trying to understand approaches that comprise the multimodal universe of various emerging communication forms, which consolidates several sign systems that interweaves each other in order to establish language uses, and thus the result of human relations expressed by ways of several languages. This implies to mention literacy and multi-literacy, once multimodality is a constitutive characteristic of social communicative forms, which are found in society in accordance with technological development. Not only this emphasizes oral and written interactions, but also includes every communicative technology. Once that new means of organization for academic knowledge are created as a result of this context of continuous changes and that new means of reading, interpreting and producing texts are constantly being produced, this paper presents only those ones focused on the study of languages, which stimulates a didactic and pedagogical transposition flexible to several cultural contexts. From this assumption, this paper aims to present results from a research conducted on the program of post-degree in Agricultural Education (UFRRJ), which intends to create a summary and analyze critically the knowledge and didactical and pedagogical practice of Portuguese Language Teachers of The Federal Institute of Amap?. Thus, this study purposed to see that the Portuguese-speaking school with a didactic and pedagogical practice rooted in the theory of genres , guided at first by the National Curriculum Standards , can help pluridiscursivo language learning , going beyond what is proposed and waiting for this document , achieving citizenship education linked to the context of technological change , in which different genres emerge as the sociocomunicativa needs of individuals in situations of social interaction / O ensino de L?ngua Portuguesa ministrado pelo professor da contemporaneidade n?o pode prescindir das orienta??es e influ?ncias dos Par?metros Curriculares Nacionais e dos postulados te?ricos da Lingu?stica Textual, os quais s?o ancorados nos princ?pios te?ricos de Mikhail Bakhtin. Ao mesmo tempo, ? importante que esse profissional organize sua pr?tica, a partir de orienta??es did?tico-pedag?gicas de ensino com g?neros textuais, as quais perpassam pelo vi?s das sequ?ncias did?ticas de Bernard Schneuwly e Joaquim Dolz, bem como pela vertente te?rica interacionista de Levi Vygotsky. ? necess?rio, tamb?m, buscar compreender abordagens que abranjam o universo multimodal das distintas formas comunicativas emergentes, em que se consolidam diversos sistemas de signos. Isso implica referirmo-nos ao conceito de Letramento(s) e/ou de Multiletramentos, uma vez que a multimodalidade ? um tra?o constitutivo das distintas formas sociocomunicativas que circulam em sociedade, em fun??o do desenvolvimento tecnol?gico. Por conseguinte, sabe-se que, nesse contexto de transforma??es constantes, surgem novos meios de estrutura??o dos conhecimentos cient?ficos; destacando, aqui, apenas aqueles voltados para ?rea de linguagens, os quais suscitam uma transposi??o did?tico-pedag?gica flex?vel aos contextos culturais diversificados, tendo em vista que, a todo instante, s?o instauradas novas maneiras de ler, interpretar e produzir textos. A partir desses pressupostos, este trabalho tem como objetivo principal apresentar resultados de uma pesquisa realizada no ?mbito do Programa de P?s- Gradua??o em Educa??o Agr?cola da (UFRRJ), em uma institui??o Federal de Educa??o, Ci?ncia e Tecnologia do estado do Amap?. Dessa maneira, esse estudo intencionou constatar que o ensino de l?ngua portuguesa com uma pr?tica did?tico-pedag?gico alicer?ada na teoria dos g?neros textuais, orientada, a princ?pio, pelos Par?metros Curriculares Nacionais, pode favorecer o aprendizado pluridiscursivo da l?ngua, indo al?m do que ? proposto e esperado por esse documento, alcan?ando uma forma??o cidad? vinculada ao contexto das transforma??es tecnol?gicas, em que distintos g?neros emergem, conforme a necessidade sociocomunicativa dos indiv?duos nas situa??es de intera??o social

Chemicals offer a wide range of desired functions and are used in a variety of consumer goods and industrial sectors. The number of individual synthetic organic chemicals produced and the total global chemical production volume are increasing. The majority of these anthropogenic chemicals are not monitored in environmental matrices nor in the indoor environment even though some are associated with undesirable consequences and the range of possible chemical impacts is still far from being fully understood. Chemicals that remain in the environment for a long time and/or distribute over a large area have high exposure potential, and will present particularly acute challenges if a currently unknown undesirable effect is discovered.  This thesis describes the development of a set of in silico methods to identify and prioritize chemicals with high exposure potential that are currently not subject to national or international restrictions. In brief, we i) compiled databases of contaminants of potential concern, ii) established models to predict key properties to fill data gaps in the absence of experimental data, and iii) developed and applied methods to screen chemicals to identify those that should be assigned high priority for future study.  Paper I delivers screening-level models to predict partition ratios of organic chemicals between polymeric materials commonly found indoors, and both air and water. These models can be used in high-throughput exposure assessment studies, passive sampling experiments, and models of emissions, fate and transport of chemicals.  Paper II presents a scoring method to prioritize 464 organic chemicals of emerging Arctic concern for their potential to fit a set of four exposure-based hazard profiles. These four profiles represent persistent organic pollutants (POPs) regulated under the Stockholm Convention, very persistent and very bioaccumulative substances (vPvBs) regulated under REACH and for two novel and unregulated profiles derived from the planetary boundary threats framework; airborne persistent contaminants (APCs) and waterborne persistent contaminants (WPCs). APCs and WPCs are chemicals that are mobile in air and water, respectively, and that contaminate the environment in a poorly reversible manner due to their persistence. The prioritization method is based on a reference set of 148 chemicals that is used to contextualize the scoring results.  Paper III describes the prioritization of 8,648 chemicals that were reportedly produced in five OECD countries. Paper III elucidates the relationship between the elemental composition of these chemicals and the exposure-based hazard scores, and presents a strategy to disentangle overlaps among the four exposure hazard profiles by categorizing chemicals according to the spatial coverage of profiles they best fit.  Paper IV focuses on refining the prioritization method described in Papers II and III using a set of 5,600 hypothetical chemicals. The refined method is used to prioritize the chemicals from Papers II and III, and an additional 4,567 chemicals from the REACH database.  The in silico methods developed in this thesis can be applied to conduct screening-level exposure assessments using only chemical structures as a starting point. Substances prioritized as having high potential to be POPs, vPvB, APC, or WPC should be considered for more detailed study to unequivocally determine their identity and physicochemical properties. / <p>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.</p>