utilizada para futuras calibrações, pois responde linearmente com a variação da quantidade de material biológico.O resultado da pesquisa mostrou que existem bandas moleculares em comum entre a atmosfera e o material biológico, sendo atribuídas a potenciais marcadores moleculares que, possivelmente, poderão ser detectados de forma remota em futuras missões espaciais.Palavras-chave: bioassinaturas -espectroscopia no infravermelho -exoplanetas -DNA -extremófilos -atmosfera terrestre. AbstractIt is notorious that interest in detecting life beyond Earth has increased in the scientific world. The existence of possible biological markers the terrestrial atmosphere, the presence of living material or organic material decomposed on surfaces and at the sea increase the chances of success of the research. Life on Earth is everywhere and the planet is saturated with its manifestations.The objective of this thesis is the development of a methodology that o↵ers ideas for the detection of bioassinatures outside the Earth, particularly in exoplanets. In terms of molecular biology, the main signature of life is DNA (desoxyribonucleic acid), which organizes and hosts the genetic code all of the living things. Other molecules that denounce the presence of life are chlorophyll, carotenoids, DNA fragments, organic molecules, etc.In an attempt to find bioassinatures in the atmosphere of exoplanets, a requirement must be met: the identification of characteristic bands that allow the detection of a signal associated with a complex biomolecule, preferably in the infrared region, seen in the middle of the peaks of gases atmospheric conditions. Thus, a series of spectral analyzes were performed for DNA samples / cells of the extremophilic microorganism Halobacterium salinarum, to be compared to the infrared spectrum obtained directly from the Earth's atmosphere. The search for specific markers was performed in order to determine the peaks that allow the detection of these singular components when suspended in atmospheric gases.The results of the research show that the Earth's atmosphere is contaminated with complex molecules. There is a total of 37 common absorptions found in the spectrum of the Earth's atmosphere and in Cells or DNA spectra (for example 966, 936, 924, 886 and 866 cm 1 ). Among them, the peaks centered at approximately 1018, 996, 900 and 840