1605 10 20655 http://socictopen.socict.org/files/original/52c7677934144bd9cdf3c53d3b1090b0.pdf 37119058e4993b8ae4241ce5e6ab646f Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualidade pós-colheita de frutas e hortaliças cultivadas de forma orgânica Creator An entity primarily responsible for making the resource Bárbara Bruna Maniçoba Pereira, Emmanuel Moreira Pereira, Yvana Maria Gomes dos Santos, Manoel Tolentino Leite Filho, Sinara Pereira Fragoso Description An account of the resource As frutas e hortaliças movimentam uma grande parte da economia regional e nacional, a produção orgânica vem ganhando cada vez mais destaque, pela qualidade, isenta de contaminantes químicos advindos de agroquímicos. Objetivou-se nesse trabalho determinar a qualidade pós-colheita das hortaliças tipo folha (alface, couve folha e rúcula) e fruto (pimentacumari) assim como as frutas cítricas (toranja e tangerina) em diferentes estádios de maturação, produzidas de forma orgânica no brejo paraibano. O experimento foi conduzido no Laboratório de Pesquisa e Desenvolvimento de Produtos Frutohortícolas pertencente ao Centro de Ciências Humanas Sociais e Agrárias– Bananeiras/PB, pertencente à Universidade Federal da Paraíba. As características analisadas foram: Sólidos solúveis (SS), Acidez titulavel (AT), pH, Vitamina C e Condutividade elétrica (CE). Para as frutas (laranja e toranja) e hortaliça tipo fruto (pimenta), avaliou-se em diferentes estádios de maturação, em função da coloração da casca. A alface, couve e a rúcula apresentam bons teores de sólidos solúveis totais e vitamina C. Para a pimenta Cumari todos os parâmetros com exceção do pH sofreram aumentos consideráveis a medida que avança a maturação. Para tangerina e cravo necessita-se de mais estudos. A toranja apresentou bons teores de vitamina C. Date A point or period of time associated with an event in the lifecycle of the resource 2015 Subject The topic of the resource Agricultura orgânica, Físico-Química, folhosas, frutos Identifier An unambiguous reference to the resource within a given context 10.18378/rvads.v10i2.3441 Source A related resource from which the described resource is derived Revista Verde de Agroecologia e Desenvolvimento Sustentável Publisher An entity responsible for making the resource available Grupo Verde de Agroecologia e Abelhas (GVAA) Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Agriculture (General), Geography. Anthropology. Recreation, Environmental sciences Relation A related resource <a href="http://www.gvaa.com.br/revista/index.php/RVADS/article/view/3441" target="_blank" rel="noreferrer noopener">http://www.gvaa.com.br/revista/index.php/RVADS/article/view/3441</a> http://socictopen.socict.org/files/original/e3d107ff09e3e7853728cd81aaaa2661.pdf 084ced6c80e0a4ed887d0c1f99152e50 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualidade pós-colheita de frutos de mangueira (Mangifera indica L) var. 'Tommy Atkins' sob sistema orgânico no submédio São Francisco (Brasil) Creator An entity primarily responsible for making the resource P.A. da C. Pinto, C.M.M. Choudhury, J.A. de Lins, S. Homma, A.C.C Pinto, C.P da Silva, R.S. Oliveira Description An account of the resource O objetivo do trabalho foi avaliar a qualidade pós - colheita de frutos de mangueira Tommy Atkins, cultivada sob sistema orgânico. Os frutos foram avaliados logo ao chegarem ao laboratório (0) e após armazenamento em câmara fria a 10,5º ± 1 ºC e 85,5º ± 5 % de UR, durante, 14, 28 e 42 dias após a colheita (DAC), sendo que após cada período, foram retirados da câmara fria e mantidos durante quatro dias a 21 ± 1º C e 55-65 % de UR, após o que foram caracterizados física, biológica e químicamente. O delineamento experimental foi em blocos inteiramente ao acaso. As médias foram comparadas pelo teste de Tukey. Os frutos foram avaliados quanto a: perda de água e a aparência, danos mecânicos, coloração da casca, firmeza da polpa, ocorrência de colapso interno, escurecimento de lenticelas, danos por lesões devido ao ataque de Lasiodiplodia, Colletotrichum ou por Alternaria ou por tripes; SST, ATT e o pH da polpa. As mangas estavam aptas para o consumo por volta dos 18 DAC, tempo, mais do que suficiente para se proceder ao transporte do produto até mercados distantes, como o americano e o europeu. Date A point or period of time associated with an event in the lifecycle of the resource 2018 Subject The topic of the resource agricultura sustentável · atributos físicos, biológicos e químicos · agro-ecossistemas Identifier An unambiguous reference to the resource within a given context 10.15304/rr.id5308 Source A related resource from which the described resource is derived Recursos Rurais Publisher An entity responsible for making the resource available Universidade de Santiago de Compostela Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Agriculture (General), Forestry Relation A related resource <a href="https://revistas.usc.es/index.php/rr/article/view/5308" target="_blank" rel="noreferrer noopener">https://revistas.usc.es/index.php/rr/article/view/5308</a> http://socictopen.socict.org/files/original/7b7b9c50d4ddcc9c25c659873ed870dd.pdf 4baf77bcb0244d8a42c9e4f1c85ce46f Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualidade química de frutos do maracujazeiro-amarelo em solo com biofertilizante irrigado com águas salinas Chemical quality of yellow passion fruit in soil with biofertilizer and irrigated with saline water Creator An entity primarily responsible for making the resource Lourival F. Cavalcante, Thiago J. Dias, José L. de O. Freire, José A. M. do Nascimento, Márkilla Z. Beckmann-Cavalcante, Gaudêncio P. dos Santos Description An account of the resource Um experimento foi desenvolvido para avaliar os efeitos da salinidade da água de irrigação e frequências de aplicação de biofertilizante bovino no solo sobre as qualidades químicas de frutos de maracujazeiro-amarelo. Os tratamentos foram distribuídos em arranjo fatorial 5 x 4, correspondendo aos valores de condutividade elétrica da água de irrigação: 0,5; 1,5; 2,5; 3,5 e 4,5 dS m-1 e a quatro frequências de aplicação do biofertilizante: sem a aplicação do biofertilizante (SB); aplicação realizada uma semana antes do transplantio (1 SAT); a cada 90 dias a partir do transplantio (90 DAT); uma semana antes do transplantio e a cada 90 dias após o transplantio (1 SAT + 90 DAT). Pelos resultados se certifica de que o aumento da salinidade da água inibiu o rendimento em polpa, os teores de sólidos solúveis (SS), o pH, a razão sólidos solúveis/acidez titulável (SS/AT) e os teores de vitamina 'C' no suco, proporcionando maior acidez e elevação da condutividade elétrica do suco. O aumento da frequência de aplicação do biofertilizante, apesar de aumentar a condutividade elétrica do suco atenuou os efeitos degenerativos dos sais da água de irrigação ás plantas, resultando em incremento no rendimento em polpa, teores de vitamina 'C' e ainda reduziu a razão SS/AT e o pH da polpa.This work had the objective to evaluate the effects of irrigation water salinity (EC) associated to application frequencies of bovine biofertilizer on chemical qualities of yellow passion fruits. The treatments were distributed using 5 x 4 factorial design corresponding the five EC of irrigation plant water of 0.5, 1.5, 2.5, 3.5 and 4.5 dS m-1, in four frequencies of application of the biofertilizer: without bovine biofertilizer (SB); with application one week before transplanting (1 SAT); application with intervals of 90 days after transplanting (90 DAT); and, with application one week before transplanting and at intervals of 90 days (1 SAT + 90 DAT). From the results it is verified that the increased salinity of water inhibited the pulp yield, the total soluble solids (TSS), pH, the ratio of total soluble solids and titratable acidity (TSS/AT) and vitamin 'C' in juice, providing increased acidity and electrical conductivity of the juice. The increased frequency of application of the biofertilizer, despite increasing the electrical conductivity of the juice diminished the degenerative effects of salts of irrigation water to plants, resulting in an increase in pulp yield, vitamin 'C' and also reduced the ratio TSS/AT and the pH of the pulp of yellow passion fruit. Date A point or period of time associated with an event in the lifecycle of the resource 2011 Subject The topic of the resource Bio-Fertilizer, Caracterização, Efluente orgânico, Passiflora edulis, Passiflora edulis L, Salinidade, Salinity, characterization Identifier An unambiguous reference to the resource within a given context 10.1590/S1415-43662011000300002 Source A related resource from which the described resource is derived Revista Brasileira de Engenharia Agrícola e Ambiental - Agriambi Publisher An entity responsible for making the resource available Universidade Federal de Campina Grande Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Agriculture (General) Relation A related resource <a href="http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S1415-43662011000300002" target="_blank" rel="noreferrer noopener">http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S1415-43662011000300002</a> http://socictopen.socict.org/files/original/360f6c976791e75a58d336c90f75d256.pdf d73accd365f9654bc1f2c58c90b6fa90 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualidade Química na Compostagem de Resíduos Urbanos com Inoculação Biológica Creator An entity primarily responsible for making the resource Egon Nord Description An account of the resource A compostagem é um processo eficiente para estabilização dos resíduos orgânicos que pode ser melhorada com o uso de inoculantes biológicos para uso na agricultura orgânica. Objetivou-se avaliar o efeito de um inoculante biológico na qualidade química de composto orgânico produzido com alguns resíduos urbanos. No experimento de compostagem utilizou-se o delineamento inteiramente casualizado em esquema fatorial 2x2, sendo dois resíduos de alta relação C:N (bagaço de cana e folhas de varrição) e dois níveis de inoculação (com e sem). Foram avaliados teores de macro e micronutrientes, C, pH e a demanda química de oxigênio nos compostos produzidos. A temperatura e a demanda química de oxigênio (DQO) foram os melhores indicadores do processo de compostagem dos materiais testados. Para as condições deste estudo, o inoculante biológico testado não alterou os teores de macro e micronutrientes e não acelerou o processo de compostagem. Conclui-se que há ampla possibilidade de transformação de resíduos orgânicos urbanos em insumos agrícolas, através da aplicação de tecnologia Date A point or period of time associated with an event in the lifecycle of the resource 2014 Source A related resource from which the described resource is derived Revista de Estudos Sociais Publisher An entity responsible for making the resource available Universidade Federal de Mato Grosso Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Regional economics. Space in economics Relation A related resource <a href="http://periodicoscientificos.ufmt.br/ojs/index.php/res/article/view/1971" target="_blank" rel="noreferrer noopener">http://periodicoscientificos.ufmt.br/ojs/index.php/res/article/view/1971</a> http://socictopen.socict.org/files/original/24e7499e2a6eadcb6d6a56be9d272404.pdf 5adc38d630f39c01b0474ce2e070b10a Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualidade sanitária do milho em Santa Catarina no período 1994-99 Creator An entity primarily responsible for making the resource Armando Correa Pacheco Description An account of the resource O objetivo deste trabalho foi avaliar o comportamento das safras de milho no período 1994/99 com relação à qualidade sanitária dos grãos, medida em porcenta­gem de grãos ardidos, bem como alertar para a necessidade de mu­danças nos sistemas de produção, visando a maximização do uso dos fatores que previnam e/ou redu­zam os riscos de epidemias de podridões de espigas de milho. Date A point or period of time associated with an event in the lifecycle of the resource 2021 Subject The topic of the resource Zea, podridão de semente Source A related resource from which the described resource is derived Revista Agropecuária Catarinense Publisher An entity responsible for making the resource available Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina - Epagri Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Agriculture (General) Relation A related resource <a href="https://publicacoes.epagri.sc.gov.br/RAC/article/view/1319" target="_blank" rel="noreferrer noopener">https://publicacoes.epagri.sc.gov.br/RAC/article/view/1319</a> http://socictopen.socict.org/files/original/e8d5cee4268d24bbff9c5fa608127356.pdf dff55a8db2ac10e1d1b9a71c780555ad Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualidade sanitária e produção de alface irrigada com esgoto doméstico tratado Creator An entity primarily responsible for making the resource José T. de Sousa, Beatriz S. O. de Ceballos, Israel N. Henrique, Suzana M. S. Lima, Hélvia W. C. de Araújo Description An account of the resource Resumo A utilização de águas residuárias tratadas na agricultura fornece, ao solo e aos vegetais, água, nutrientes e matéria orgânica, que conservam o solo e agem como fertilizantes orgânicos, podendo ocasionar, entretanto, contaminações no produto final. Na presente pesquisa estudouse, em dois experimentos, a irrigação de alface (Lactuca sativa L.) com água de poço, em solo sem adubação (T1) e com adubação mineral (T2), em comparação com a produtividade e a qualidade sanitária das alfaces irrigadas com água de poço e solo com adubação orgânica (T3), com fertirrigação realizada com efluentes de esgotos domésticos tratados em lagoas de polimento (T4) e efluente decantado (T5). Os resultados mostraram maiores produtividades nos tratamentos com águas de reúso, sendo maior nas alfaces irrigadas com o tratamento T5. O T4 apresentou concentrações médias de coliformes termotolerantes dentro das recomendações da OMS para irrigação irrestrita: (1.000 UFC 100 mL)-1, < 1 ovo de helminto L-1), embora tenha apresentado os maiores valores de pH de todos os efluentes (8,7 e 9,0). O T5 foi o único tratamento com efluente que não alcançou as condições microbiológicas nem parasitológicas para irrigação irrestrita. Date A point or period of time associated with an event in the lifecycle of the resource 2021 Subject The topic of the resource Reuso, irrigação, águas residuárias Identifier An unambiguous reference to the resource within a given context 10.1590/1807-1929/agriambi.v9nsupp21-25 Source A related resource from which the described resource is derived Revista Brasileira de Engenharia Agrícola e Ambiental - Agriambi Publisher An entity responsible for making the resource available Universidade Federal de Campina Grande Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Agriculture (General) Relation A related resource <a href="http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S1415-43662005000500021&amp;tlng=pt" target="_blank" rel="noreferrer noopener">http://www.scielo.br/scielo.php?script=sci_arttext&amp;pid=S1415-43662005000500021&amp;tlng=pt</a> http://socictopen.socict.org/files/original/da721967a577b911a4bcfb0a4018a487.pdf 35a8bbbd4bf5e36a2ec0866f6c4af50a Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Agricultura sostenible Description An account of the resource Dominio científico: Agricultura sostenible Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource QUALIFICAÇÃO DE ÁREAS VERDES NA CIDADE DE SÃO CARLOS (S.P.): UM OLHAR EDUCATIVO E DE GESTÃO AMBIENTAL NA BACIA HIDROGRÁFICA DO CÓRREGO SANTA MARIA DO LEME Creator An entity primarily responsible for making the resource Haydee Torres de Oliveira, Renata Bovo Bovo Peres, Andréia Nasser Figueiredo, Valéria Ghisloti Iared, Pedro Augusto Munhoz Description An account of the resource O objetivo do trabalho foi gerar subsídios para a qualificação do sistema de áreas verdes na cidade de São Carlos/SP com base em uma análise dos usos, adequabilidades e potencialidades educativas das áreas verdes da Microbacia Hidrográfica do Córrego Santa Maria do Leme. O estudo foi dividido em duas fases: a primeira concentrou-se na análise geral das 33 áreas de lazer e das 22 áreas institucionais no território da microbacia, considerando, como categoria principal, a adequabilidade de uso; na segunda fase foram selecionadas cinco áreas públicas para uma avaliação qualitativa mais detalhada considerando aspectos de legislação e gestão, acessibilidade, atributos paisagísticos, flora, fauna, atributos perceptivos e práticas socioculturais. Os resultados mostram predominância de espaços inadequados em termos de usos e funções socioambientais, pois estão mal localizados urbanisticamente e são pouco atraentes para uso coletivo. A presença do corpo hídrico como elemento estruturador de um sistema de áreas verdes é uma potencialidade em termos de conectividade. A análise dos elementos permitiu a problematização das relações entre gestão ambiental e aspectos educativos nas áreas verdes urbanas, importantes para a formulação de políticas públicas que promovam cidades mais integradas socioambientalmente. Date A point or period of time associated with an event in the lifecycle of the resource 2018 Identifier An unambiguous reference to the resource within a given context 10.14393/SN-v30n1-2018-7 Source A related resource from which the described resource is derived Revista Sociedade & Natureza Publisher An entity responsible for making the resource available Editora da Universidade Federal de Uberlândia Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Environmental sciences, Social sciences (General) Relation A related resource <a href="http://www.seer.ufu.br/index.php/sociedadenatureza/article/view/37838" target="_blank" rel="noreferrer noopener">http://www.seer.ufu.br/index.php/sociedadenatureza/article/view/37838</a> http://socictopen.socict.org/files/original/2cbb96998a6cae166a7f3ee9b31fe490.pdf 02645a09bdf746cb3a6ee204c2c8f7bf Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Coronavirus Description An account of the resource Dominio científico: Coronavirus Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualitative Analysis of a Mathematical Model in the Time of COVID-19 Creator An entity primarily responsible for making the resource Thabet Abdeljawad, Kamal Shah, Fahd Jarad, Ibrahim Mahariq Description An account of the resource In this article, a qualitative analysis of the mathematical model of novel corona virus named COVID-19 under nonsingular derivative of fractional order is considered. The concerned model is composed of two compartments, namely, healthy and infected. Under the new nonsingular derivative, we, first of all, establish some sufficient conditions for existence and uniqueness of solution to the model under consideration. Because of the dynamics of the phenomenon when described by a mathematical model, its existence must be guaranteed. Therefore, via using the classical fixed point theory, we establish the required results. Also, we present the results of stability of Ulam’s type by using the tools of nonlinear analysis. For the semianalytical results, we extend the usual Laplace transform coupled with Adomian decomposition method to obtain the approximate solutions for the corresponding compartments of the considered model. Finally, in order to support our study, graphical interpretations are provided to illustrate the results by using some numerical values for the corresponding parameters of the model. Date A point or period of time associated with an event in the lifecycle of the resource 2020 Identifier An unambiguous reference to the resource within a given context DOI: 10.1155/2020/5098598 Source A related resource from which the described resource is derived BioMed Research International Publisher An entity responsible for making the resource available Hindawi Limited Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Medicine http://socictopen.socict.org/files/original/dc7f4e1c121418a76b0915baabb7be25.pdf 14961e9041f151c3fbe6955b4481a6b0 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Coronavirus Description An account of the resource Dominio científico: Coronavirus Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualitative analysis of visual risk communication on twitter during the Covid-19 pandemic Creator An entity primarily responsible for making the resource Joanna Sleigh, Julia Amann, Manuel Schneider, Effy Vayena Description An account of the resource Abstract Background The Covid-19 pandemic is characterized by uncertainty and constant change, forcing governments and health authorities to ramp up risk communication efforts. Consequently, visuality and social media platforms like Twitter have come to play a vital role in disseminating prevention messages widely. Yet to date, only little is known about what characterizes visual risk communication during the Covid-19 pandemic. To address this gap in the literature, this study’s objective was to determine how visual risk communication was used on Twitter to promote the World Health Organisations (WHO) recommended preventative behaviours and how this communication changed over time. Methods We sourced Twitter’s 500 most retweeted Covid-19 messages for each month from January–October 2020 using Crowdbreaks. For inclusion, tweets had to have visuals, be in English, come from verified accounts, and contain one of the keywords ‘covid19’, ‘coronavirus’, ‘corona’, or ‘covid’. Following a retrospective approach, we then performed a qualitative content analysis of the 616 tweets meeting inclusion criteria. Results Our results show communication dynamics changed over the course of the pandemic. At the start, most retweeted preventative messages came from the media and health and government institutions, but overall, personal accounts with many followers (51.3%) predominated, and their tweets had the highest spread (10.0%, i.e., retweet count divided by followers). Messages used mostly photographs and images were found to be rich with information. 78.1% of Tweets contained 1–2 preventative messages, whereby ‘stay home’ and ‘wear a mask’ frequented most. Although more tweets used health loss framing, health gain messages spread more. Conclusion Our findings can inform the didactics of future crisis communication. The results underscore the value of engaging individuals, particularly influencers, as advocates to spread health risk messages and promote solidarity. Further, our findings on the visual characteristic of the most retweeted tweets highlight factors that health and government organisations should consider when creating visual health messages for Twitter. However, that more tweets used the emotive medium of photographs often combined with health loss framing raises concerns about persuasive tactics. More research is needed to understand the implications of framing and its impact on public perceptions and behaviours. Date A point or period of time associated with an event in the lifecycle of the resource 2021 Subject The topic of the resource Public health, covid-19, Pandemic, Risk communication, twitter, visuals Identifier An unambiguous reference to the resource within a given context 10.1186/s12889-021-10851-4 Source A related resource from which the described resource is derived Epidemiology and Health Publisher An entity responsible for making the resource available Korean Society of Epidemiology Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Public aspects of medicine http://socictopen.socict.org/files/original/5d705971b0590f666f23f9b0c945cff7.pdf 03ae1751a8047cce18d9d3548ada683b Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Coronavirus Description An account of the resource Dominio científico: Coronavirus Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Qualitative and Quantitative Analysis of the Major Constituents in Chinese Medical Preparation Lianhua-Qingwen Capsule by UPLC-DAD-QTOF-MS Creator An entity primarily responsible for making the resource Zheng Li, Yan Zhu, Chunhua Wang, Yue-Fei Wang, Miao-Miao Jiang, Guixiang Pan, Weina Jia Description An account of the resource Lianhua-Qingwen capsule (LQC) is a commonly used Chinese medical preparation to treat viral influenza and especially played a very important role in the fight against severe acute respiratory syndrome (SARS) in 2002-2003 in China. In this paper, a rapid ultraperformance liquid chromatography coupled with diode-array detector and quadrupole time-of-flight mass spectrometry (UPLC-DAD-QTOF-MS) method was established for qualitative and quantitative analysis of the major constituents of LQC. A total of 61 compounds including flavonoids, phenylpropanoids, anthraquinones, triterpenoids, iridoids, and other types of compounds were unambiguously or tentatively identified by comparing the retention times and accurate mass measurement with reference compounds or literature data. Among them, twelve representative compounds were further quantified as chemical markers in quantitative analysis, including salidroside, chlorogenic acid, forsythoside E, cryptochlorogenic acid, amygdalin, sweroside, hyperin, rutin, forsythoside A, phillyrin, rhein, and glycyrrhizic acid. The UPLC-DAD method was evaluated with linearity, limit of detection (LOD), limit of quantification (LOQ), precision, stability, repeatability, and recovery tests. The results showed that the developed quantitative method was linear, sensitive, and precise for the quality control of LQC. Date A point or period of time associated with an event in the lifecycle of the resource 2015 Identifier An unambiguous reference to the resource within a given context DOI: 10.1155/2015/731765 Source A related resource from which the described resource is derived The Scientific World Journal Publisher An entity responsible for making the resource available Hindawi Limited Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Technology, Science, Medicine