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Se is one of the essential nutrients for human health and animal growth; it participates in various physiological functions, such as antioxidant and immune response and metabolism. Se deficiency is related in the animal industry to poor production performance and the appearance of health problems in humans. Therefore, interest has arisen in producing fortified foods, nutritional supplements, and animal feed products enriched with Se. A sustainable strategy for bio-based products enriched with Se is microalgae. These are characterized by the ability to bioaccumulate inorganic Se and metabolize it into organic Se for product formulations of industrial interest. Although there are some reports on Se bioaccumulation, further exploration is needed to understand the effects of Se bioaccumulation in microalgae. Therefore, this article presents a systematic review of the genes or groups of genes that trigger biological responses associated with the metabolization of Se in microalgae. A total of 54,541 genes related to Se metabolization distributed in 160 different classes were found. Similarly, trends were identified through bibliometric networks on strains of greatest interest, bioproducts, and scientific production.

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Understanding how studies have been carried out in the region helps to understand the Amazon rainforest potential in mitigating climate change. In addition, evaluating scientific production is essential to verify the main methods and places researched. Thus, this study objective was to build an overview and identify the main gaps regarding research related to biomass and carbon stocks with the coverage limit of the Amazon rainforest. Therefore, an analysis of the publications indexed in the Scopus database was developed until 2020, performing a bibliometric analysis and a systematic and state-of-the-art review. Initially 2042 publications were obtained, of which 786 met the inclusion criteria. The first work indexed in the Scopus database related to the theme was published in 1982. Over time, it was possible to observe an increasing behavior in relation to the interest in the theme. Natural environments were the most researched and change in the land use and occupation of the Amazon Rainforest is still poorly evaluated. Brazil is the country with the highest number of studies, followed by Peru and Colombia. Guyana and Suriname appear as possible scientific gaps and potential environments to be studied. Studies preferentially explore the biomass carbon, with the soil being little evaluated when compared to the total amount of papers found. When observing only the biomass studies, the aboveground biomass is the most evaluated, while the roots and necromass are little studied. The main variables used in biomass equations were diameter at 1.3 m above ground and total tree height. The biomass to carbon conversion factor has been widely used, but it can generate unreliable results. It is recommended to carry out local assessments of the carbon content, especially using the dry combustion method, which generates less waste, with more precise results and shorter execution time of the analyses. Such assessments present values for the location that can avoid false or misinterpretations of the biomass and carbon stocks in the Amazon Rainforest.

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Resumen Introducción: la tecnología Biofloc, es un proceso de biorremediación que permite minimizar el intercambio de agua y su uso en los sistemas de acuicultura. Objetivo: presentar tendencias de las publicaciones científicas acerca de la tecnología Biofloc para producción piscícola, utilizando las herramientas de análisis bibliométrico. Materiales y métodos: se empleó la base de datos Web of Science, con una ecuación de búsqueda y procesamiento de la información apoyada por las herramientas BibExcel y VOSviewer. Se realizó un análisis sistemático en los documentos recuperados, teniendo en cuenta: tipo de cultivo, tiempo experimental, rendimiento de crecimiento y proteico, densidad poblacional, calidad del agua, características microbiológicas y fisiológicas del cultivo. Se determinaron categorías en las cuales están definidos los estudios con relación a la tecnología y los principales desafíos identificados en la aplicación de la tecnología. Resultados: se encontraron 258 documentos, el 94,12 % correspondieron a artículos de investigación. La productividad fue mayor en 2014 y 2016. La Universidad Federal de Santa Catarina y la Universidad Federal de Rio Grande FURG en Brasil tienen la mayor producción. En coautorías se identificaron 18 nodos. El 59,3 % de los documentos reportaron investigaciones con camarón y el 18,99 % con tilapia. Los mejores tiempos de producción estuvieron en los rangos de 41-50 días (12,4 %), 21-30 días (11,24 %) y 51-60 días (9,68 %). La relación C: N no fue reportada en el 92,6 % de los trabajos. Sin embargo, el 3,48 % reportaron relaciones de 15:1 y el 1,16 % de 20:1. Las principales categorías fueron rendimiento (44,18 %) y productividad (26,35 %). Conclusiones: la tecnología Biofloc representa una oportunidad para la sustentabilidad en prácticas acuícolas de especies. Se evidenció un crecimiento gradual en los procesos de investigación en los últimos años; los principales estudios están relacionados con el rendimiento en cuanto a crecimiento y optimización de los procesos de conversión proteica en los cultivos analizados bien sean individuales o en policultivo.

Abstract Introduction: Biofloc technology is a bioremediation process that allows minimizing the exchange of water and its use in aquaculture systems. Objective: to present trends in scientific publications about Biofloc technology for fish production, using bibliometric analysis tools. Materials and methods: the Web of Science database was used, with a search equation and information processing supported by the BibExcel and VOSviewer tools. A systematic analysis was carried out on the recovered documents, considering type of culture, experimental time, growth and protein yield, population density, water quality, microbiological and physiological characteristics of the crop. Categories were determined in which the studies related to technology and the main challenges identified in the application of technology are defined. Results: 258 documents were found, 94.12 % corresponded to research articles. Productivity was higher in 2014 and 2016. The Federal University of Santa Catarina and Federal University of Rio Grande FURG in Brazil have the highest production. In co-authorship, 18 nodes were identified. 59.3 °% of the documents reported investigations with shrimp and 18.99 % with tilapia. The best production times were in the ranges of 41-50 days (12.4 %), 2130 days (11.24 %) and 51-60 days (9.68 %). The C:N ratio was not reported in 92.6 % of the studies. However, 3.48 % reported ratios of 15:1 and 1.16 % of 20:1. The main categories were performance (44.18 %) and productivity (26.35 %). Conclusions: Biofloc technology represents an opportunity for sustainability in species aquaculture practices. A gradual growth in research processes was evidenced in recent years; the main studies are related to the performance in terms of growth and optimization of the protein conversion processes in the analyzed crops, whether individual or in polyculture.

Resumo Introdução: a tecnologia Biofloc é um processo de biorremediação que permite minimizar as trocas de água e seu uso em sistemas de aquicultura. Objetivo: apresentar tendências em publicações científicas sobre a tecnologia Biofloc para produção de peixes, utilizando ferramentas de análise bibliométrica. Materiais e métodos: foi utilizada a base de dados Web of Science, com equação de busca e processamento de informações apoiado pelas ferramentas BibExcel e VOSviewer. Foi efetuada uma análise sistemática dos documentos recuperados, tendo em consideração: tipo de cultura, tempo experimental, crescimento e rendimento protéico, densidade populacional, qualidade da água, características microbiológicas e fisiológicas da cultura. Foram definidas categorias nas quais são definidos os estudos relacionados à tecnologia e os principais desafios identificados na aplicação da tecnologia. Resultados: foram encontrados 258 documentos, 94,12 % correspondiam a artigos de pesquisa. A produtividade foi maior em 2014 e 2016. A Universidade Federal de Santa Catarina e a Universidade Federal do Rio Grande FURG no Brasil têm a maior produção. Em coautoria, 18 nós foram identificados. 59,3 °% dos documentos relataram investigações com camarão e 18,99 % com tilápia. Os melhores tempos de produção ficaram nas faixas de 4150 dias (12, %), 21-30 dias (11,24 %) e 51-60 dias (9,68 %). A relação C: N não foi relatada em 92,6 % dos estudos. No entanto, 3,48 % relataram proporções de 15:1 e 1,16 % de 20:1. As principais categorias foram desempenho(44,18 %) e produtividade (26,35 %). Conclusões: A tecnologia Biofloc representa uma oportunidade para a sustentabilidade nas práticas de aquicultura de espécies. Um crescimento gradual nos processos de pesquisa foi evidenciado nos últimos anos; Os principais estudos estão relacionados com o desempenho em termos de crescimento e otimização dos processos de conversão de proteínas nas culturas analisadas, sejam individuais ou em policultura.

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Antineoplastic agents present potential hazards to human health and the environment. For this reason, these compounds have attracted a great deal of attention from researchers in the environmental sciences field. In order to help guide future research, it is important to understand the current state of investigation of the occurrence of these microcontaminants and methods for their removal, especially focusing on Fenton and photo-Fenton processes applied to various aqueous matrices in which this class of pharmaceuticals is present. For this purpose, a systematic review of these topics was performed by bibliometric analysis of articles published during the last decade and available in the Scopus and Web of Science databases. This study enables visualization of the current panorama and trends in this field, providing a guide for future collaborative research and exchange of knowledge. Various strategies have been suggested to improve the efficiency of Fenton and photo-Fenton processes, mainly by means of the application of multiples additions of iron, the use of heterogeneous catalysts, and/or the use of chelating agents. Some studies have evaluated different radiation sources employed for photo-Fenton processes, such as solar and/or artificial radiation. In turn, the identification of transformation products generated by Fenton and photo-Fenton treatments, together with their evaluation by in silico (Q)SAR predictions or experimental toxicological bioassays, are related subjects that have been less reported in published works and that should be studied in depth. These subjects can support treatment evaluations that are more realistic, considering their limitations or potentials.

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RESUMO Este artigo caracteriza o estado da arte na área de logística reversa (LR), verificando as publicações de destaque nas bases de dados ScienceDirect e Web of Science (WoS) por meio das análises bibliométrica e sistêmica. A partir de 462 artigos, os principais periódicos, autores, instituições e países de realização da pesquisa bem como as parcerias de pesquisa foram identificados. Observou-se que as publicações sobre o tema têm aumentado constantemente ao longo dos anos, sendo os Estados Unidos o país com o maior número tanto em publicações quanto em parcerias. Os pesquisadores brasileiros devem buscar parcerias com instituições estrangeiras, pois estas demonstraram o potencial para enriquecer as discussões e fomentar publicações de qualidade. O artigo identificou os principais trabalhos nessa área, assim como as lacunas que podem orientar trabalhos futuros.

ABSTRACT This paper characterizes the state of the art in the area of reverse logistics by analyzing publications in the ScienceDirect and Web of Science (WOS) databases through bibliometric and systematic analysis. From a sample of 462 papers, leading journals, authors, research institutions and countries, as well as research partnerships were identified. It was noted that publications on the subject have steadily increased over the years, with the United States having the largest number of publications and partnerships. Brazilian researchers should seek partnerships with foreign institutions, since they have demonstrated the potential to enrich discussions and foster quality publications. This paper identified the main studies in this area, as well as the gaps that could guide future researches.

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Images function as sources of data and influence our thinking about fieldwork, representation, and intersubjectivity. In this article, I show how both the ethnographic relationships and the working method of photography lead to a more nuanced understanding of a healing event. I systematically analyze 33 photographs made over a 15-minute period during the preparation and application of a poultice (topical cure) in a rural Andean home. The images chronicle the event, revealing my initial reaction and the decisions I made when tripping the shutter. By unpacking the relationship between ethnographer and subject, I reveal the constant negotiation of positions, assumptions, and expectations that make up intersubjectivity. For transparency, I provide thumbnails of all images, including metadata, so that readers may consider alternative interpretations of the images and event.

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