A Constituição do sistema participativo de garantia do sul de Minas

Os Sistemas Participativos de Garantia (SPG) visam assegurar, por meio do processo de avaliação participativa da conformidade, a garantia de que um produto, processo ou serviço atende a regulamentos técnicos da agricultura orgânica. Apesar de ter sido regulamentado em 2009, poucos grupos de agricultores conseguiram constituir um SPG. A experiência do Sul de Minas na constituição do seu SPG tem chamado a atenção de vários grupos. Para realização deste trabalho, utilizou-se da análise documental e observação participante como procedimentos técnicos metodológicos. Seu objetivo foi resgatar o processo de constituição do SPG Sul de Minas, para que possa servir de referência teórica e prática para outros grupos de agricultores e técnicos que queiram conhecer o processo de constituição de um Sistema Participativo de Garantia. Constatou-se que o histórico dos agricultores da região com a Agroecologia e agricultura orgânica e as parcerias foram aspectos que contribuíram para a constituição e consolidação do SPG Sul de Minas

A valorização da sociobiodiversidade na alimentação escolar

O objetivo do trabalho foi investigar a realidade da inserção dos alimentos da sóciobiodiversidade na alimentação escolar das escolas públicas do estado de Minas Gerais e sua relação com as questões ambientais. Tratou-se de uma pesquisa documental de abordagem qualitativa e os materiais de investigação foram as sistematizações elaboradas pelo CECANE IFSULDEMINAS no produto das Oficinas Regionais realizadas em 2018. As oficinas foram realizadas em diferentes regiões do estado, nos municípios de Lavras, Boa Esperança, Bambuí, Uberlândia e Pompéu. Foi constatado um total de 73 itens alimentares diferentes, destes 15 são considerados nativos dos biomas brasileiros e seis Plantas Alimentícias Não Convencionais (PANCs). O resultado do levantamento feito nas oficinas demonstrou pouca diversidade alimentar nos cardápios escolares, sendo que 26 itens foram citados em todas oficinas. Este padrão alimentar é preocupante do ponto de vista ambiental, uma vez que está restrito a poucas espécies de plantas. Por outro lado, o Brasil é um país de grande riqueza biológica, com muitas espécies consideradas propícias para a alimentação humana, onde a simbiose entre homem e natureza acontece nos processos de sociobiodiversidade, um potencial a ser valorizado, em que a escola aparece como um mecanismo estratégico de incentivo

Historical Evolution of the Use of Digital Technology in Teaching Mathematics in Brazilian Classrooms

Digital technologies are important tools to adapt the teaching of mathematics to students, but even with a wide use there are few studies historically detailing this mode of teaching, so this work aims to historically demonstrate the evolution of the technologies used. To achieve this objective, a bibliographic review was carried out in the SCIELO, SBEM, SBM and PROFMAT databases, obtaining as a result 15 articles that use some resources of digital technology as a tool for teaching mathematics, thus managing to have a timeline that includes the computer, diskette, CD/DVD, webcam, digitizing tablet, video projector, digital whiteboard, and some mathematical software, concluding that teachers already use digital technology in the classroom as a means of improving the teaching-learning process

Sistema participativo de garantia Orgânicos Jequitinhonha: o desafio da participação em tempos de pandemia

The Participatory Guarantee System (PGS) is an organic conformity assessment methodology based on the active participation of interested actors who organize themselves in a network. The Covid-19 pandemic imposed several restrictions on social interaction and, as a result, peer and verification visits, the main social control mechanism used by PSG, were suspended in 2020. Aiming to maintain the dynamics of interaction and also contribute to reduce the impacts of social isolation on the lives of farmers, the PGS Orgânicos Jequitinhonha developed a method of remote visits. The objective of this work was to understand how this adaptation took place and what results were achieved. It is an action research, in which the authors actively participated in the implementation of the researched methodology. We highlight as results the social control satisfactorily exercised in a remote system, greater interaction between families, learning in the use of digital technologies that were considered inaccessible by family farmers in Vale do Jequitinhonha.O Sistema Participativo de Garantia (SPG) é uma metodologia de avaliação da conformidade orgânica baseada na participação ativa dos atores interessados que se organizam em rede. A pandemia da Covid-19 impôs diversas restrições de convívio social e, com isso, as visitas de pares e de verificação, principal mecanismo de controle social utilizado pelos SPGs, ficaram suspensas em 2020.  Visando manter a dinâmica de interação e ainda contribuir para diminuir os impactos do isolamento social na vida dos agricultores, o SPG Orgânicos Jequitinhonha desenvolveu um método de visitas remotas. O objetivo deste trabalho foi compreender como se deu essa adaptação e quais os resultados foram alcançados. Trata-se de uma pesquisa-ação, onde os autores participaram ativamente da implantação da metodologia pesquisada. Destacamos como resultados o controle social exercido de forma satisfatória em sistema remoto, a maior interação entre as famílias, a aprendizagem no uso das tecnologias digitais que eram consideradas inacessíveis pelos agricultores familiares do Vale do Jequitinhonha

MOBILITY RESTRICTIONS FOR THE CONTROL OF COVID-19 EPIDEMIC

Objective: To determine whether the SEIR model, associated to mobility changes parameters, can determine the likelihood of establishing control over an epidemic in a city, state or country. Study design and setting: The critical step in the prediction of COVID-19 by a SEIR model are the values of the basic reproduction number (R0) and the infectious period, in days. R0 and the infectious periods were calculated by mathematical constrained optimization, and used to determine the numerically minimum SEIR model errors in a country, based on COVID-19 data until April 11th. The Community Mobility Reports from Google Maps (<https://www.google.com/covid19/mobility>) provided mobility changes on April 5th compared to the baseline (Jan 3th to Feb 6th). The data was used to measure the non-pharmacological intervention adherence. The impact of each mobility component was calculated by logistic regression models. COVID-19 control was defined by SEIR model R0<1.0 in a country. Results: The ECDC has registered 1,653,204 COVID-19 worldwide on April 11th. Sixteen countries presented 78% of all cases. Of the six Google Maps mobility parameters, the “Stay at home” parameter was the strongest one to control COVID-19 in a country: an increase of 50% in mobility trends for places of residence has a 99% chance of outbreak control. Conclusions: Residential mobility restriction presented itself as the most effective measure. The SEIR model associated with mobility parameters proved to be a useful tool in determining the chance of COVID-19 outbreak control

Integration method of non-elementary exponential functions using iterated Fubinni integrals

The present work presents a new method of integration of non-elementary exponential functions where Fubinni\u27s iterated integrals were used. In this research, some approximations were used in order to generalize the results obtained through mathematical series, in addition to integration methods and double integrals. In addition to the integration methods, the Taylor series was used, where the value found and compatible with the values ​​of the power series that are used to calculate the value of the exponential function demonstrated in the work was verified. In addition to the methods described, a comparison of the values ​​obtained by the series and the values ​​described in the method was improvised, where it was noticed that the higher the value of the variable, the closer the results show a stability for the variable greater than the value 4, described in table 01. The conclusions point to a great improvement, mainly for solving elliptic differential equations and statistical functions

Addition of orange, pineapple and beet juices as extenders for cryopreservation of ram semen

Searching for improvements in semen cryopreservation, natural substances are commonly studied focusing to improve the sperm quality. The aim of this study were evaluated the effect of adding orange, pineapple, and beet juices in different concentrations and combinations to the ram semen cryopreservation extender. Five ejaculates from five adult rams were used. The semen pool was diluted in egg yolk-based extender and mixed with the following 15 treatments (at a final concentration of 400.10⁶ sptz/mL): orange 10% (O10) and 15% (O15); pineapple 10% (P10) and 15% (P15); beet 10% (B10) and 15% (B15); pineapple + orange 10% (PO10) and 15% (PO15); pineapple + beet 10% (PB10) and 15% (PB15); beet + orange 10% (BO10) and 15% (BO15); pineapple + beet + orange 10% (PBO10) and 15% (PBO15); and the control group (CON). Post-thaw in 0.25 mL straws semen quality analysis of cryopreserved semen was performed by CASA and flow cytometry. Analysis of variance (PROC GLM) was carried out and the averages were compared using the SNK test. Pearson's correlation test was also performed. No effect was noted in the addition of juices to the semen extender prior to cryopreservation. Post-thawed, although, statistically similar to the control group, the total motility of the B10 group reached acceptable standards of total motility. In addition, B10 group showed the highest values (p<0.05) of progressive motility than control group or other treatments. The addition of 10% beet juice to the ram semen extender can improve the cryopreservation of sperm motility. Keywords: antioxidant; freezing; sperm; semen extender

Effects of Brazil's political crisis on the science needed for biodiversity conservation

The effects of Brazil’s political crisis on science funding necessary for biodiversity conservation are likely to be global. Brazil is not only the world’s most biodiverse nation, it is responsible for the greater part of the Amazon forest, which regulates the climate and provides rain to much of southern South America. Brazil was a world leader in satellite monitoring of land-use change, in-situ biodiversity monitoring, reduction in tropical-forest deforestation, protection of indigenous lands, and a model for other developing nations. Coordinated public responses will be necessary to prevent special-interest groups from using the political crisis to weaken science funding, environmental legislation and law enforcement. Keywords: Brazil, biodiversity, climate change, governance, fundin