Vanessa Pecini da Cunha’s scientific contributions

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Publications (3)


AS IMAGENS NO ENSINO DE CIÊNCIAS: O QUE DIZEM OS ESTUDANTES SOBRE ELAS? THE IMAGES IN SCIENCE TEACHING: WHAT DO STUDENTS SAY ABOUT THEM?
  • Article
  • Full-text available

January 2013

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95 Reads

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31 Citations

Revista Caderno Pedagógico

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Daniela Tomio

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Vanessa Pecini Da Cunha

Resumo: Nos livros didáticos e outros gêneros discursivos empregados por professores e estudantes, bem como nas avaliações oficiais, como o ENEM, a leitura de imagens tem sido uma competência valorizada no atual contexto sócio-histórico e, por isso, também, merecido destaque nas pesquisas em ensino de Ciências. Nesse cenário, objetivou-se identificar os sentidos atribuídos por estudantes sobre como empregam e compreendem as imagens em seus processos de aprender Ciências. Para tal, foram coletados dados por meio de um questionário elaborado com recursos do Messenger-MSN e e-mail, respondido por estudantes da 3ª série do Ensino Médio. Além da apresentação de um panorama das pesquisas com uso de imagens no ensino de Ciências, as conclusões sugerem a valorização de processos educativos que incentivem os estudantes à formação de uma cultura visual na leitura de imagens. Palavras-chave: Imagem. Ensino de Ciências. Biologia. Abstract: In textbooks and other discursive genres used by teachers and students, as well as, in official assessments, as ENEM, the reading of images has been a competence valued in the current socio-historical context and also, it has been given more attention in the researches in science teaching. In this context, it was aimed to identify the meanings attributed by students about how they use and understand the images in their process of learning science. For this, data were collected through a questionnaire prepared with resources from MSN-Messenger and e-mail, answered by students in the 3rd grade of High School. Besides presenting an overview of the researches about the use of images in science teaching, the conclusions suggest the enhancement of educational processes that encourage students to construct a visual culture in the reading of images.

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Figure 1. Oxygen consumption measurements of Bothrops jararaca measured at 20 and 30°C using the volumetric system. Each symbol indicates a mean for period and standard errors are shown by the vertical lines. Each horizontal black bar indicates the photophase of the photoperiod. N = 4 snakes per group. ***p < 0.001 20ºC versus 30ºC (Tukey's test). 
Figure 2. Body temperature at 20 to 30°C under a 12:12 light/dark cycles for a 24 h observation period. Each symbol indicates a mean for period and standard errors are shown by the vertical lines. Each horizontal black bar indicates the photophase of the photoperiod. N = 4 snakes per group. **p < 0.01 and ***p < 0.001 20 o C versus 30 o C (Tukey's test). 
The influence of circadian rhythms on the metabolism of the snake Bothrops jararaca (Serpentes, Viperidae) = A influência dos ritmos circadianos no metabolismo da serpente Bothrops jararaca (Serpentes, Viperidae)

July 2008

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289 Reads

Acta Scientiarum Biological Sciences

The thermoregulatory activity has led to an extensive search for correlations between physiological variables, including metabolic functions, and the ideal level of body temperature. Snakes were also often seen basking, when their body temperatures were relatively independent of ambient temperature, indicating successful thermoregulation. Bothrops jararaca were exposed to two different ambient temperatures (20 and 30oC) over a time course of three weeks and oxygen consumption and body temperature were measured. The snakes exhibited a freerunning rhythm of body temperature. Metabolic rate wasincreased at the same circadian phase as the increase in body temperature in the 30oC. The increase of body temperature and oxygen consumption of B. jararaca occurs in the scotophase of the photoperiod, consistent with that of nocturnal species. However, prior to a scotophase period the snakes under 20oC maintain body temperature and oxygen consumption at higher levels during the day. These results demonstrate for the first time that ectothermic animals may display physiologically generated circadian rhythms of bodytemperature similar to those recorded in endotherms. Circadian rhythms allow animals to anticipate environmental changes: physiological parameters such as body temperature andmobilization of energy reserves have to be adjusted before the expected environmental changes actually take place. A atividade termorreguladora conduziu a uma busca extensiva para o entendimento das correlações entre as variáveis fisiológicas, incluindo as funções metabólicas e a temperatura corporal. Frequentes observações mostram que algumas serpentes podem se aquecer, sendo este aumento de temperatura independente da temperatura ambiente, indicando a termorregulação bem sucedida. Bothrops jararaca foramexpostas a dois ambientes com diferentes temperaturas (20 e 30oC) durante três semanas, sendo mensuradas a temperatura corporal e o consumo de oxigênio. O aumento da temperatura corporal e consumo de oxigênio de Bothrops jararaca ocorreram na fase de escuro do fotoperíodo, consistente para espécies noturnas. Entretanto, antecedendo a fase de escuro, as serpentes em 20oC apresentaram os níveis mais elevados durante o dia para temperatura corporal e consumo de oxigênio. Estes resultados indicam pela primeira vezque animais termodependentes podem controlar a temperatura corporal por meio de ritmos fisiológicos circadianos, semelhante aos observados em termoindependentes. Os ritmos circadianos permitem que os animais antecipem as mudanças no ambiente: parâmetros fisiológicos como a temperatura corporal e as reservas de energia ou sua mobilização podem ser ajustadas antes que as mudanças ambientais previstas ocorram realmente.


The influence of circadian rhythms on the metabolism of the snake Bothrops jararaca (Serpentes, Viperidae)

January 2008

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107 Reads

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2 Citations

Acta Scientiarum Biological Sciences

The thermoregulatory activity has led to an extensive search for correlations between physiological variables, including metabolic functions, and the ideal level of body temperature. Snakes were also often seen basking, when their body temperatures were relatively independent of ambient temperature, indicating successful thermoregulation. Bothrops jararaca were exposed to two different ambient temperatures (20 and 30oC) over a time course of three weeks and oxygen consumption and body temperature were measured. The snakes exhibited a freerunning rhythm of body temperature. Metabolic rate was increased at the same circadian phase as the increase in body temperature in the 30oC. The increase of body temperature and oxygen consumption of B. jararaca occurs in the scotophase of the photoperiod, consistent with that of nocturnal species. However, prior to a scotophase period the snakes under 20oC maintain body temperature and oxygen consumption at higher levels during the day. These results demonstrate for the first time that ectothermic animals may display physiologically generated circadian rhythms of body temperature similar to those recorded in endotherms. Circadian rhythms allow animals to anticipate environmental changes: physiological parameters such as body temperature and mobilization of energy reserves have to be adjusted before the expected environmental changes actually take place.

Citations (2)


... No atual contexto social e histórico, a leitura de imagens tornou-se uma habilidade reconhecida em avaliações oficiais, tal como o Exame Nacional do Ensino Médio (ENEM). A utilização dessas ilustrações aparece em livros didáticos e em diversas formas de discursivo, sendo, portanto, reconhecida na pesquisa em ensino de ciências (TOMIO et al., 2013). ...

Reference:

FORMAÇÃO DE PROFESSORES EM TEMPOS DE PANDEMIA ELABORAÇÃO DE SITUAÇÕES-PROBLEMA NO ENSINO DE CIÊNCIAS DA NATUREZA ATRAVÉS DE UMA OFICINA VIRTUAL
AS IMAGENS NO ENSINO DE CIÊNCIAS: O QUE DIZEM OS ESTUDANTES SOBRE ELAS? THE IMAGES IN SCIENCE TEACHING: WHAT DO STUDENTS SAY ABOUT THEM?

Revista Caderno Pedagógico

... Yet, bird taxa vary in metabolic rhythmicitypasserine birds generally show circadian effects on BMR while many polar birds, sea birds, pigeons, and birds of paradise do not (reviewed in Ellis and Gabrielsen, 2019). Among ectotherms, circadian patterns in metabolic rate are displayed by aquatic invertebrates (Chacón et al., 2003;Rosas et al., 1992; but see Diawol et al., 2016), by fishes (Kim et al., 1997;Ross & McKinney, 1988;Svendsen et al., 2014), and by reptiles (Birchard et al., 2006;Blem & Killeen, 1993;da Cruz et al., 2008;Klein et al., 2006;Roe et al., 2004Roe et al., , 2005. In terrestrial arthropods, circadian rhythmicity in SMR has been exhibited by insects (Banks et al., 1975;Crozier, 1979;Shipp & Otton, 1976;Woodring & Clifford, 1986), spiders (Humphreys, 1977; but see Stoltey & Shillington, 2009), and crustaceans (Reddy & Bhagyalakshmi, 1994;Van Senus, 1985). ...

The influence of circadian rhythms on the metabolism of the snake Bothrops jararaca (Serpentes, Viperidae)
  • Citing Article
  • January 2008

Acta Scientiarum Biological Sciences