42 research outputs found

    Assessment of the Fitbit Charge 2 for monitoring heart rate

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    Fitness trackers are devices or applications for monitoring and tracking fitness-related metrics such as distance walked or run, calorie consumption, quality of sleep and heart rate. Since accurate heart rate monitoring is essential in fitness training, the objective of this study was to assess the accuracy and precision of the Fitbit Charge 2 for measuring heart rate with respect to a gold standard electrocardiograph. Fifteen healthy participants were asked to ride a stationary bike for 10 minutes and their heart rate was simultaneously recorded from each device. Results showed that the Fitbit Charge 2 underestimates the heart rate. Although the mean bias in measuring heart rate was a modest -5.9 bpm (95% CI: -6.1 to -5.6 bpm), the limits of agreement, which indicate the precision of individual measurements, between the Fitbit Charge 2 and criterion measure were wide (+16.8 to -28.5 bpm) indicating that an individual heart rate measure could plausibly be underestimated by almost 30 bpm

    Pineus boerneri (Hemiptera: Adelgidae) - pulgão-lanígero-do-pínus - praga introduzida em plantios de Pinus spp. no Brasil.

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    Essigella california (Essig, 1909) (Hemiptera, Aphididae) - praga introduzida em plantios de Pinus spp. no Brasil.

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    Anoplophora glabripennis Motschulsky (Coleoptera: Cerambycidae: Lamiinae) espécie potencialmente quarentenária para o Brasil.

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    bitstream/item/215470/1/com-tec194.pd

    Eulachnus rikeyi (Williams, 1911) (Hemiptera: Aphididae) - praga introduzida em plantios de Pinus spp. no Brasil.

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    Monitoramento e controle de Pissodes castaneus em Pinus spp.

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    bitstream/CNPF-2009-09/42331/1/Circular130.pd

    A Volatile Semiochemical Released by the Fungus Garden of Leaf-Cutting Ants

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    Made available in DSpace on 2020-12-10T19:55:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-03-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The symbiosis between fungi and leaf-cutting ants (Hymenoptera: Formicidae) has aroused the interest of researchers about the mechanism used by ants to select plants. The nutritional needs of the fungus garden, and the absence of potentially deleterious substances from plants, are criteria for selection by foraging workers. This is supported by behavioral experiments using fungicide with baits (citrus pulp) or forage plants highly accepted by leaf-cutting ants. The fungus garden is hypothesized to emit a volatile semiochemical in response to a fungicide, which informs ants that a plant is unsuitable for its growth. The objectives of our study were to identify the volatile compounds released by the fungus garden of leaf-cutting ants in response to a fungicide, as well as to determine the behavioral response of workers to healthy and unhealthy fungus gardens. The results showed no difference in the proportion of volatile compounds released by either healthy or unhealthy fungus gardens. Analysis of the responses of ants to healthy or unhealthy fungus gardens in a dual-choice experiment revealed a strong attraction to the fungus garden, regardless of its health status. We therefore conclude that no volatile semiochemicals are emitted by the fungus garden due to the action of deleterious substances. Univ Estadual Sao Paulo, Dept Protecao Vegetal, Lab Insetos Sociais Praga, UNESP, Botucatu, SP, Brazil Univ Estadual Sao Paulo, Fac Ciencias Agron, Lab Cent, UNESP, Botucatu, SP, Brazil Univ Oeste Paulista UNOESTE, Coll Agr Sci, Agron Dept, Lab Agr Entomol, Presidente Prudente, SP, Brazil Univ Estadual Sao Paulo, Dept Protecao Vegetal, Lab Insetos Sociais Praga, UNESP, Botucatu, SP, Brazil Univ Estadual Sao Paulo, Fac Ciencias Agron, Lab Cent, UNESP, Botucatu, SP, Brazil CNPq: 301718/2013-
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