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Prokaryotic communities show marked asymmetry linked to salinity, with ice microorganisms producing more biopigments than water microorganisms. Spectroscopy identifies fluorescent biomolecules (e.g., humic molecules, tryptophan, likely ß-carotene) and detects chlorophylls and carotenoids in enriched cultures, supporting the first color bio-signature catalogue for icy worlds.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & 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extra-terrestrial life  \nin icy worlds  \nLígia Patrícia Fonseca Coelho  \nSupervisor: Doctor Zita Carla Torrão Pinto Martins  \nCo-Supervisors: Doctor Rodrigo da Silva Costa  \nDoctor João Alfredo Vieira Canário  \nThesis approved in public session to obtain the PhD Degree in  \nBioengineering  \nJury final classification: Pass with Distinction  \nUNIVERSIDADE DE LISBOA  \nINSTITUTO SUPERIOR TÉCNICO  \nAstrobiology analysis of icy biomes as a proxy for extra-terrestrial life in icy  \nworlds  \nLígia Patrícia Fonseca Coelho  \nSupervisor: Doctor Zita Carla Torrão Pinto Martins  \nCo-Supervisors: Doctor Rodrigo da Silva Costa  \nDoctor João Alfredo Vieira Canário  \nThesis approved in public session to obtain the PhD Degree in Bioengineering Jury final classification: Pass with Distinction  \nJury:  \nChairperson: Doctor Joaquim Manuel Sampaio Cabral, Instituto Superior Técnico, Universidade de Lisboa  \nMembers of the Committee:  \nDoctor Warwick Farley Vincent, Faculté des sciences et de genie, Université Laval, Canada Doctor Miguel Nobre Parreira Cacho Teixeira, Instituto Superior Técnico, Universidade de Lisboa Doctor Lisa Kaltenegger, Carl Sagan Institute, Cornell University, EUA  \nDoctor Zita Carla Torrão Pinto Martins, Instituto Superior Técnico, Universidade de Lisboa Doctor Bruno André Cunha de Vallêra Jacques Pedras, Instituto Superior Técnico, Universidade de  \nLisboa  \nFunding Institution – Fundação para a Ciência e Tecnologia  \nAll civilizations become either spacefaring or extinct.  \nCarl Saga  \nResumo  \nUma das questões que a astrobiologia pretende responder é se estamos sozinhos nouniverso. Alguns mundos gelados que orbitam Júpiter, Saturno, e outras estrelas, sãolocais de interesse para procurar vida extraterrestre. Missões espaciais in-situ são oderradeiro método que poderá fornecer uma resposta definitiva a esta questão, e várias missões a estes mundos estão planeadas acontecer nas próximas décadas. No entanto, ainda é necessário trabalho na Terra, com recurso a análogos planetários, para preparar estas missões. Análogos planetários são locais no nosso planeta que reproduzem características de ambientes extraterrestres. No inverno, a Baía de Hudson, no Canadá, é um análogo planetário para alguns mundos gelados. Foi realizado um estudo integrativo na costa da Baía de Hudson para determinar e relacionar a química e a microbiologia doseu gelo e água. Primeiro, foi concebido e testado um protocolo para o processamento degelo após a colheita de amostras, e foi investigado a possível contaminação durante os processos de amostragem e processamento de gelo. Em sequência, a estrutura procariótica das amostras de gelo e água foi explorada, revelando uma assimetria íngreme entre estas comunidades e a sua relação com a salinidade. Os microrganismos de gelo revelaram produzir mais biopigmentos do que os microrganismos na água. Espectroscopia foi aplicada para explorar o conteúdo de biomoléculas fluorescentes. Moléculas húmicas, triptofano, e provavelmente ß-caroteno foram encontrados em amostras de gelo e água, variando ao longo do gradiente de salinidade, e dependendo do grau de degradaçãobiológica. Clorofilas e carotenoides foram detetados em suspensões enriquecidas demicrorganismos cultivados a partir das amostras, e os seus sinais refletiam-se de forma diferente dependendo da disponibilidade de água. Esta abordagem holística de análise astrobiológica do mesmo conjunto de amostras, que inova nas boas práticas de trabalho de campo para amostras de gelo polar, desvendou comunidades procarióticas do gelo e  \nda água da costa Baía de Hudson e suas assinaturas químicas, culminando no primeirocatálogo de bioassinaturas coloridas para procurar vida em mundos gelados.  \nPalavras-Chave: Baía de Hudson, bioassignaturas, biopigmentos, microbiologia polar, espectroscopia  \nAbstract  \nOne of the questions astrobiology aims to answer is whether we ","cbCaiuTRDwr6eVOK","https://ap.wps.com/l/cbCaiuTRDwr6eVOK","pdf",6442322,212,"English","# Resumo\n## Background and motivation\n## Planetary field analogues\n## Hudson Bay study design\n## Sampling and processing protocol\n## Microbial community structure and salinity effects\n## Biopigments and fluorescent biomolecules\n## Spectroscopy outcomes\n## Bio-signature catalogue\n# Palavras-Chave","[{\"question\":\"Why is Hudson Bay used in the thesis?\",\"answer\":\"Hudson Bay in winter is used as a planetary field analogue, reproducing characteristics of icy extraterrestrial environments for astrobiology research.\"},{\"question\":\"What was investigated in relation to the ice and water samples?\",\"answer\":\"The study relates chemistry and microbiology across an ice–water salinity gradient, including prokaryotic community structure and associated chemical signatures.\"},{\"question\":\"How were contamination and sampling procedures addressed?\",\"answer\":\"A clean protocol for processing ice after sampling was designed and tested, and possible ice sampling/processing contaminants were investigated and documented.\"}]","Astrobiology analysis of icy biomes as a proxy for extra-terrestrial life in icy worlds - PhD Thesis | PDF",534]