Motores movidos a biodiesel como alternativa para a diversificação da matriz energética brasileira / Biodiesel engines as an alternative for the diversification of the Brazilian energy matrix

Visto a crescente demanda por atividades econômicas sustentáveis, tornam-se necessários estudos científicos que contribuam para a gestão ambiental, visando a melhoria da cadeia produtiva. No caso dos transportes, com a elevada emissão de agentes poluidores provenientes de motores a combustão, tal contexto se faz ainda mais evidente. Desde março de 2021 os motores movidos a diesel têm, por obrigação legal, uma mistura composta por 13% de biodiesel, participando, ainda, timidamente na matriz energética brasileira. Assim, o objetivo deste trabalho foi identificar ações economicamente viáveis que possam introduzir o biodiesel em larga escala, substituindo o modelo tradicional de transportes no Brasil, ainda concentrado no petróleo. Para levantamento de dados foram avaliados diagnósticos de indicadores setoriais. Os resultados demonstraram que cerca de 80% da produção de biodiesel provém da soja, observando-se a necessidade de incentivos para uma maior diversificação de matérias-primas. Além disso, o agricultor poderá ter uma valoração dos serviços ecossistêmicos, pois, além de participar da sua cadeia de produção, contribui para a manutenção da qualidade da água e do solo, sequestro de carbono e até preservação de espécies, podendo ser remunerado por serviços ambientais

O uso da citronela no controle da dengue: revisão

There is a constant concern of the Ministry of Health regarding the epidemic of dengue in Brazil caused by the virus transmitted by the mosquito Aedes Aegypti. This insect is the main vector of diseases, like zika and chikungunya. In search of new forms of prevention, there are numerous studies to reduce the use of chemicals and to make natural repellents gain greater visibility, because they are safer for humans and the environment. Therefore, in this work, it will be presented a review on the use of citronella essential oils in the fight against dengue as a form of mosquito protection repellent. Key words: Aedes egypti, Cymbopogon nardus, natural repellents.Há uma constante preocupação do Ministério da Saúde em relação à epidemia de dengue no Brasil causada pelo vírus transmitido pelo mosquito Aedes aegypti. Este inseto é o principal vetor de doenças como também a zika, e chikungunya. Em busca de novas maneiras de prevenção, existem inúmeros estudos para que se diminua o uso de produtos químicos e para que repelentes naturais ganhem mais visibilidade, pois estes são mais seguros para o ser humano e o meio ambiente. Logo, neste trabalho será apresentado uma revisão sobre o uso de óleos essenciais da citronela no combate à dengue como forma de repelente na proteção contra os mosquitos. Palavras-chave: Aedes aegypti, Cymbopogon nardus, repelentes naturais

Production components in transformed and untransformed ‘Micro-Tom’ tomato plants

ABSTRACT Changes to the amounts of certain proteins have resulted in several studies, among them the so-called heat shock proteins (HSP), which take many forms, most of them constitutive. However, other forms may be inducible by a particular stress factor. The ‘Micro-Tom’ tomato is considered a model for experimental studies due to having suitable characteristics, such as reduced size, short generation time, and ease of transformation. Growth and production components were therefore evaluated in ‘Micro-Tom’ tomato plants transformed for different levels of mitochondrial HSP (MT-sHSP23.6). Plants from genotypes of the ‘Micro-Tom’ tomato (untransformed, and transformed with overexpression and with expression silencing) were grown under controlled conditions of temperature, photoperiod and photon flux density. To obtain the data, successive collections were carried out at regular intervals (21 days) throughout the development cycle of the plants, starting from the 21st day after transplanting (DAT). Total dry matter, leaf area, dry-weight partitioning between the plant organs, and production components were determined in the three genotypes. From interpretation of the results, it was found that plants transformed with overexpression of MT-sHSP23.6 displayed greater production capacity, considering the fresh weight of the fruit; but in general, the data showed that genetic transformation did not bring about major changes in growth, since the three genotypes displayed similar behaviour

Production components in transformed and untransformed ‘Micro-Tom’ tomato plants

<div><p>ABSTRACT Changes to the amounts of certain proteins have resulted in several studies, among them the so-called heat shock proteins (HSP), which take many forms, most of them constitutive. However, other forms may be inducible by a particular stress factor. The ‘Micro-Tom’ tomato is considered a model for experimental studies due to having suitable characteristics, such as reduced size, short generation time, and ease of transformation. Growth and production components were therefore evaluated in ‘Micro-Tom’ tomato plants transformed for different levels of mitochondrial HSP (MT-sHSP23.6). Plants from genotypes of the ‘Micro-Tom’ tomato (untransformed, and transformed with overexpression and with expression silencing) were grown under controlled conditions of temperature, photoperiod and photon flux density. To obtain the data, successive collections were carried out at regular intervals (21 days) throughout the development cycle of the plants, starting from the 21st day after transplanting (DAT). Total dry matter, leaf area, dry-weight partitioning between the plant organs, and production components were determined in the three genotypes. From interpretation of the results, it was found that plants transformed with overexpression of MT-sHSP23.6 displayed greater production capacity, considering the fresh weight of the fruit; but in general, the data showed that genetic transformation did not bring about major changes in growth, since the three genotypes displayed similar behaviour.</p></div