Results 41 to 50 of about 12,659 (195)

Museu de ciências naturais Carlos Ritter: desafios e perspectivas para museus de ciências naturais universitários [PDF]

, 2018
O Museu de Ciências Naturais Carlos Ritter apresenta em seu acervo uma importante coleção representativa da biodiversidade do Bioma Pampa. Conservar este patrimônio e levar o conhecimento à comunidade são importantes atividades desenvolvidas pelo museu e
Nunes, João Fernando Igansi
core   +1 more source

Seasonality and hydrodistillation time effects on the yield and chemical composition of leaves essential oil of Piper mikanianum (Kunth) Steudel

Eclética Química, 2018
Piper mikanianum from Santa Catarina, southern Brazil, is a well known source of safrole, an arylpropanoid precursor of several bioactive molecules. This work determined the seasonal and hydrodistillation time influence on the essential oil (EO) yield ...
Sabrina M. Clemes, Thalita G. Santos, Ricardo A. Rebelo, Rudi R. Laps, Rosete Pescador   +4 more
doaj   +1 more source

Juvenile and Pubertal Exposure to Polystyrene Nanoplastics Impairs Epididymal Structure and Sperm Quality in Mice

Environmental Toxicology, EarlyView.
ABSTRACT Nanoplastics (NPs) are emerging environmental contaminants capable of crossing biological barriers, accumulating in tissues, and disrupting physiological pathways. The male reproductive system is particularly vulnerable during the postnatal period, a developmental window characterized by intense testicular differentiation and epididymal ...
Gabriel Magalhães Oliveira Rigo, Nicoly Caixêta Gonçalves, Cristiana Livramento Oliveira Pinto, Patrícia Corona Lopes, Raul Silva Santarem, Juliana Reis Machado, Régia Caroline Peixoto Lira, Ana Paula Ramos, Marcos Vinicius da Silva, Hugo Felix Perini, Gláucia Eloisa Munhoz de Lion Siervo   +10 more
wiley   +1 more source

Demographic buffering in natural populations: A multi‐level perspective

Journal of Animal Ecology, EarlyView.
We introduce a multi‐level framework that unites stochastic elasticities with nonlinear selection to test demographic buffering. Applying it across mammals reveals a key insight: ecological robustness to variability often decouples from evolutionary constraint, reshaping how we understand resilience under environmental stochasticity.
Gabriel Silva Santos, Samuel J. L. Gascoigne, André Tavares Corrêa Dias, Maja Kajin, Roberto Salguero‐Gómez   +4 more
wiley   +1 more source

Desenvolvimento atípico e inclusão : concepções de estudantes de Ciências Naturais [PDF]

, 2017
Trabalho de Conclusão de Curso (graduação)—Universidade de Brasília, Faculdade UnB Planaltina, Licenciatura em Ciências Naturais, 2017.Crianças com desenvolvimento atípico são aquelas que têm algum comportamento fora dos padrões normais e que podem ter ...
Souza, Brenda Kevellyn da Silva
core  

Natural quark mixing and inverse seesaw in a left-right model with an axion

Journal of High Energy Physics, 2019
We consider a minimal left-right model with a Peccei-Quinn symmetry, where generalised charge conjugation plays the role of the left-right symmetry. We show how the spontaneous breaking of the Peccei-Quinn symmetry by a scalar singlet can provide us with
Alex G. Dias, Julio Leite
doaj   +1 more source

Stable Isotope Analysis as a Tool to Prevent Illicit Wildlife Trade of Songbirds in Brazil

Animal Conservation, EarlyView.
Feather isotopes provide clear differences between wild and captive songbirds in Brazil. Combining multiple isotopes improved classification accuracy and revealed individuals falsely declared as captive‐bred. These results demonstrate the potential of isotope analysis to detect wildlife laundering in the bird trade.
Luiza Brasileiro, Fábio J. V. Costa, Paulo R. R. Ramos, Vladimir E. Costa, Gabriela B. Nardoto   +4 more
wiley   +1 more source

Aproximações a uma concepção histórico-crítica de objetivo do ensino de Ciências Naturais [PDF]

, 2020
Este texto apresenta e discute aproximações teóricas a uma concepção de objetivo do ensino de ciências naturais, baseando-se na construção coletiva da pedagogia histórico-crítica.
Pereira, Lucas Monteiro, Lunardi Campos, Luciana Maria   +1 more
core   +1 more source

Toxicity and antitumor potential of Mesosphaerum sidifolium (Lamiaceae) oil and fenchone, its major component

BMC Complementary and Alternative Medicine, 2017
Background The essential oil from Mesosphaerum sidifolium (L’Hérit.) Harley & J.F.B.Pastore (syn. Hyptis umbrosa), Lamiaceae (EOM), and its major component, have been tested for toxicity and antitumor activity.
Thaísa Leite Rolim, Déborah Ribeiro Pessoa Meireles, Tatianne Mota Batista, Tatyanna Kelvia Gomes de Sousa, Vivianne Mendes Mangueira, Renata Albuquerque de Abrantes, João Carlos Lima Rodrigues Pita, Aline Lira Xavier, Vicente Carlos Oliveira Costa, Leônia Maria Batista, Marcelo Sobral da Silva, Marianna Vieira Sobral   +11 more
doaj   +1 more source

Hidden Losses: Assessing the Risk of Coextinction Among Ectoparasitic Flies and Their Bat Host Species in Brazil

Animal Conservation, EarlyView.
The potential impact of bat species extinction on the number of their ectoparasitic fly species, based on interaction data for Brazil. As bat host species are removed over time, more connected species (green) would experience steeper declines and lead to greater ectoparasite losses when compared to a random extinction model (gray).
Nathan Lorenzo de Sena Gotti, Jonathan Ramos Ribeiro, Eder Barbier, Enrico Bernard   +3 more
wiley   +1 more source