<?xml version="1.0" encoding="UTF-8" ?><xb:digital_entity_call xmlns:xb="http://com/exlibris/digitool/repository/api/xmlbeans"><xb:digital_entity><pid>21606</pid><control><label>Biomarcadores genotóxicos e polimosfismos...</label><note>Ladeira, Carina Alexandra Fernandes, 1984-</note><ingest_id>ing1803</ingest_id><ingest_name>ulfcbiol_2010.03_02</ingest_name><entity_type xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><entity_group xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><usage_type>VIEW</usage_type><preservation_level>critical</preservation_level><partition_a>OAI-RUL</partition_a><partition_b xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><partition_c xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><status xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><creation_date>2010-03-18 17:17:55</creation_date><creator>creator:LSARAM</creator><modification_date>2010-03-19 16:40:05</modification_date><modified_by>viewer:internal</modified_by><admin_unit>DUL01</admin_unit></control><mds><md shared="false"><mid>26457</mid><description xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><name>changehistory</name><type>changehistory_md</type><value><![CDATA[<xb:history xmlns:xb="http://com/exlibris/digitool/repository/api/xmlbeans"><events><event xmlID="1"><eventIdentifier><eventIdentifierType>Service</eventIdentifierType><eventIdentifierValue>TechnicalMetadataExtractor</eventIdentifierValue></eventIdentifier><eventType>Technical Metadata Extraction</eventType><eventDateTime>2010-03-19T16:37:50.249Z</eventDateTime><eventDetail>Add some metadata to the digital entity using jhove</eventDetail><linkingAgentIdentifier><linkingAgentIdentifierType>software_used</linkingAgentIdentifierType><linkingAgentIdentifierValue>JHove</linkingAgentIdentifierValue></linkingAgentIdentifier></event></events></xb:history>]]></value></md><md shared="false"><mid>26422</mid><description> </description><name>descriptive</name><type>dc</type><value><![CDATA[<?xml version="1.0" encoding="UTF-8"?><record xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">	<dc:language>por</dc:language>	<dc:type>info:eu-repo/semantics/masterThesis</dc:type>	<dc:format>application/pdf</dc:format>	<dc:title>Biomarcadores genotóxicos e polimosfismos genéticos em trabalhadores expostos a formaldeído</dc:title>	<dc:description>Tese de mestrado, Biologia (Biologia Molecular Humana), 2009, Universidade de Lisboa, Faculdade de Ciências</dc:description>	<dcterms:abstract>O formaldeído é um agente químico, classificado como carcinogénico em humanos e animais experimentais, amplamente utilizado nos laboratórios de Anatomia Patológica. A exposição a esta substância está epidemiologicamente associada a cancro e a alterações nucleares detectáveis através do teste dos micronúcleos por bloqueio da citocinese. Este método é utilizado extensivamente em epidemiologia molecular, uma vez que permite determinar vários biomarcadores de genotoxicidade, tais como: micronúcleos (biomarcadores de quebra ou perda de cromossomas), pontes nucleoplásmicas (biomarcador de re-arranjo cromossómico, má reparação e/ou fusão de telómeros) e protusões nucleares (biomarcador de eliminação de DNA amplificado e/ou complexos de reparação de DNA). O objectivo deste trabalho é investigar a relação entre a frequência de alterações nucleares e factores genéticos e ambientais, em indivíduos expostos e não-expostos ocupacionalmente a formaldeído. Para tal, foram constituídos 2 grupos: 56 indivíduos expostos ocupacionalmente a formaldeído (casos) e 85 indivíduos não expostos (controlos). Foram recolhidos sangue periférico e células epiteliais esfoliadas da mucosa bucal. Realizou-se o estudo dos biomarcadores genotóxicos e extracção de DNA para estudo dos polimorfismos nos genes XRCC3 e ADH3. Os resultados obtidos fornecem evidência inequívoca para associação entre a exposição ocupacional a formaldeído e a presença de alterações nucleares. Os hábitos tabágicos e o consumo de álcool, exercem efeitos significativos na presença de micronúcleos na mucosa bucal, pontes nucleoplásmicas e protusões nucleares. Relativamente aos factores genéticos, verificaram-se associações estatisticamente significativas entre o polimorfismo do gene da ADH3 e a presença de micronúcleos em linfócitos periféricos e do polimorfismo do gene XRCC3 nas protusões nucleares.</dcterms:abstract>	<dcterms:accessRights>open access</dcterms:accessRights>	<dc:subject>Biologia molecular</dc:subject>	<dc:subject>Marcadores genéticos</dc:subject>	<dc:subject>Biomarcadores</dc:subject>	<dc:subject>Formaldeído</dc:subject>	<dc:subject>Teses de mestrado</dc:subject>	<dc:creator>Ladeira, Carina Alexandra Fernandes</dc:creator>	<dcterms:advisor>Gomes, Manuel do Carmo</dcterms:advisor>	<dcterms:advisor>Brito, Rui Miguel Duque de</dcterms:advisor>	<dc:date>2009</dc:date>	<dc:link>http://catalogo.ul.pt/F/?func=item-global&amp;doc_library=ULB01&amp;type=03&amp;doc_number=000576655</dc:link>	<dcterms:abstract>Formaldehyde is a chemical agent, classified as carcinogenic in humans and experimental animals, widely used in laboratories of Pathology. The exposure to this substance is epidemiologically linked to cancer and nuclear changes detected by the cytokinesis-block micronucleus test. This method is extensively used in molecular epidemiology, since it determines several biomarkers of genotoxicity, such as micronuclei (biomarkers of chromosomes breakage or loss), nucleoplasmic bridges (biomarker of chromosome rearrangement, poor repair and / or telomeres fusion) and nuclear buds (biomarker of elimination of amplified DNA). The aim of this study is to investigate the relationship between the frequency of nuclear changes and genetic and environmental factors in individuals exposed and non-occupationally exposed to formaldehyde. To this end, were made 2 groups: 56 individuals occupationally exposed to formaldehyde (cases) and 85 unexposed individuals (controls). It was collected peripheral blood and exfoliated epithelial cells of oral mucosa and carried out the study of biomarkers of genotoxic and DNA extraction for verification of polymorphisms in XRCC3 and ADH3 genes. The results provide unequivocal evidence for association between occupational exposure to formaldehyde and the presence of nuclear changes. The smoking and alcohol consumption have significant effects in the presence of micronuclei in oral mucosa, nucleoplasmic bridges and nuclear buds. For genetic factors, there were significant associations between gene polymorphism of ADH3 and the presence of micronuclei in peripheral lymphocytes and gene polymorphism in XRCC3 and nuclear buds. </dcterms:abstract></record>]]></value></md><md shared="false"><mid>26456</mid><description xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/><name>technical</name><type>text_md</type><value><![CDATA[<?xml version="1.0" encoding="utf-8"?>
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