Characterization of the surface water of a municipal natural park by quality indexes

As unidades de conservação são importantes para manutenção dos recursos ambientais. Nesse estudo avaliou-se a qualidade da água do Parque Natural de Lages, através de índices comumente utilizados: IQA, BMWP’ e Diversidade de Shannon. Coletou-se água e sedimentos em 7 pontos dentro da UC e um fora. Para avaliação do IQA mediu-se nove parâmetros, sendo o oxigênio dissolvido e temperatura no local, e os demais em laboratório. Para o cálculo dos índices BMWP’ e de Diversidade fez-se a identificação dos macroinvertebrados bentônicos presentes no sedimento. Os índices BMWP’ e Shannon indicaram pior qualidade das águas dos pontos 1, 2, 6, 7 e 8 (águas contaminadas e com menor diversidade) que o IQA (qualidade variando de boa a ótima), os pontos 3, 4 e 5, mostraram-se com águas pouco poluídas pelo BMWP’ e ótimas pelo IQA. Os resultados mostram a contaminação das águas no interior do parque havendo necessidade de uma investigação do seu entorno para averiguar as fontes de contaminação. Também se pôde comprovar a influência que a mata ciliar tem para preservação da qualidade da água. A diferença na sensibilidade dos índices utilizados evidencia a necessidade de se introduzir a análise biológica nos sistemas de monitoramento das águas.Conservation units are important for maintaining environmental resources. In this study, the water quality of the Lages Natural Park was evaluated by commonly used indexes: WQI, BMWP' and Shannon Diversity. Water and sediments were collected at seven points inside the CU and at one point outside it. For the evaluation of the WQI, nine parameters were measured: dissolved oxygen and temperature at the site, and the others at the laboratory. For the calculation of the BMWP' and Diversity indexes, the benthic macroinvertebrates in the sediment were identified. The BMWP' and Shannon indexes indicate a worse quality of the waters at the points 1, 2, 6, 7 and 8 (contaminated water and less diversity) than the WQI (quality ranging from good to optimal). The points 3, 4 and 5 had little polluted water according to BMWP' and optimal according to WQI. The results show the contamination of the water inside the park. There is a need for an investigation of its surroundings to determine the sources of contamination. It was also possible to prove the influence the riparian forest exerts in preserving the quality of the water. The difference in the sensitivity of the indexes proves the need to use biological analysis in water monitoring systems

Cobertura de los superalimentos en la prensa digital iberoamericana durante la pandemia del covid-19

This paper carries out a systematic review of the news about the so-called «superfoods» published in the digital media of Ibero-American countries from the beginning of the pandemic until 2022. Superfoods have no scientific or legal definition and are used in the media and marketing industry. A total of 796 documents were collected, counting only those news items directly related to the study subject and under the Boolean search criterion of superfoods. Once the database was cleaned, the number of documents was reduced to 64 news items from 34 digital media. This way, a descriptive and content analysis was implemented, taking into account the type of information transmitted, the scientific evidence of the news item and the multimedia resources used. In short, it is corroborated that numerous promotional publications of certain foods are considered "super" without a rigorous or scientific informative quality.El presente trabajo examina las noticias sobre los denominados «superalimentos» publicadas en los medios de comunicación digitales de los países iberoamericanos desde el inicio de la pandemia hasta el año 2022. El concepto «superalimentos» no tiene ninguna definición científica ni legal, y se utiliza en los medios de comunicación y en la industria del marketing. Para llevar a cabo la revisión sistemática, se han recopilado un total de 796 documentos, en los que solo se han contabilizado las noticias relacionadas directamente con la temática objeto de estudio bajo el criterio de búsqueda booleana de superalimentos. Una vez limpiada la base de datos, el número de documentos quedó reducido a 64 noticias pertenecientes a 34 medios de comunicación digitales distintos. De esta forma, se ha llevado a cabo un análisis descriptivo y de contenido que contempla el tipo de información transmitida, la evidencia científica de la noticia y los recursos multimedia empleados. En definitiva, se corrobora que existen numerosas publicaciones promocionales de determinados alimentos que son considerados «súper» sin una calidad informativa rigurosa ni científica

Cute Cats on a Rescue Mission: An Obituary to YouTube in Russia?

Bibliographic note POLHEIM, Annemarie. 2022. Cute Cats on a Resue Mission: An Obituary to YouTube in Russia? 67 p. Master thesis. Charles University, Faculty of Social Sciences, Institute of International Studies. Supervisor Mgr. Daniela Kolenovská, Ph.D. Abstract Russia's 2022 invasion of Ukraine has accelerated internet regulation and cutbacks on free expression in Russia. YouTube is one of the most established hybrid media platforms and an important source of information in the country. It is likely that the platform may be banned by Roskomnadzor at any time, as it blocks Russian state channels. The aim of this thesis is to outline the characteristics of the Russian YouTube landscape and to contribute to the understanding of current transformations of the Russian media system. Two datasets of YouTube channel networks, retrieved on January 6 and March 14, 2022, are analysed and compared. The data consists of YouTube channels of the Russian political spectrum and surrounding channels, as well as their links to each other (subscriptions, recommendations). A significant increase in the English-language clusters and the Russian-language educational cluster between January and March, and a decrease in the Russian-language entertainment and political clusters was observed. The findings, however, did not allow a..

Roztomilé kočičky na záchranné misi: nekrolog youtube v Rusku?

Bibliographic note POLHEIM, Annemarie. 2022. Cute Cats on a Resue Mission: An Obituary to YouTube in Russia? 67 p. Master thesis. Charles University, Faculty of Social Sciences, Institute of International Studies. Supervisor Mgr. Daniela Kolenovská, Ph.D. Abstract Russia's 2022 invasion of Ukraine has accelerated internet regulation and cutbacks on free expression in Russia. YouTube is one of the most established hybrid media platforms and an important source of information in the country. It is likely that the platform may be banned by Roskomnadzor at any time, as it blocks Russian state channels. The aim of this thesis is to outline the characteristics of the Russian YouTube landscape and to contribute to the understanding of current transformations of the Russian media system. Two datasets of YouTube channel networks, retrieved on January 6 and March 14, 2022, are analysed and compared. The data consists of YouTube channels of the Russian political spectrum and surrounding channels, as well as their links to each other (subscriptions, recommendations). A significant increase in the English-language clusters and the Russian-language educational cluster between January and March, and a decrease in the Russian-language entertainment and political clusters was observed. The findings, however, did not allow a...Department of Russian and East European StudiesKatedra ruských a východoevropských studiíFakulta sociálních vědFaculty of Social Science