A preocupação das populações de vários países e da comunidade científica global tem sido crescente nos últimos anos com relação às mudanças climáticas. O Aquecimento Global atinge níveis alarmantes e gera apreensão na comunidade internacional que teme danos irreversíveis ao planeta. A intensificação do Efeito Estufa em virtude da emissão excessiva de gases como o dióxido de carbono tem agravado esse cenário. Frente a esse problema, muitos pesquisadores têm dedicado seus esforços para criar tecnologias que visam neutralizar ou compensar os danos gerados pelos gases poluentes. Entre as alternativas disponíveis, o biossequestro de carbono ganhou espaço nos últimos anos, seu objetivo é utilizar organismos vivos para aprisionar o carbono atmosférico de forma a minimizar os impactos do aumento da temperatura do planeta. Esse artigo apresenta uma revisão da utilização de Escherichia coli, Microalgas e Árvores Geneticamente Modificadas, como biossequestradores potenciais de carbono atmosférico.
Cyanogenic glycosides are defense substances that can produce hydrocyanic acid when they undergo hydrolysis as a result of herbivory, a process called cyanogenesis. Galls are neoformed structures of plant tissues induced by species-specific interactions between an inducer organism and a host plant. Earlier studies in Microgramma species have demonstrated that has a variation in cyanogenesis within and between populations, as well as in different plant organs. Microgramma squamulosa is an epiphytic fern that may contain stem galls induced by Tortrimosaica polypodivora (Lepidoptera: Tortricidae). Thus, the aim of the present study was to assess cyanogenesis seasonally and in different tissues (galled and non-galled) of M. squamulosa. The study was conducted in populations located in the Rio de Janeiro state, Brazil. Cyanogenesis was assessed using the Feigl-Anger paper test. A total of 260 galled and non-galled tissues were analyzed, 45 gall samples, 67 sterile leaves, 103 stems and 2 croziers. Cyanogenesis was detected in only three sterile leaf samples. In none of the samples were the stems or galls cyanogenic. The results corroborate the hypothesis that the stems of Microgramma squamulosa galled by Tortrimosaica polypodivora are not cyanogenic.
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