Population Biology
Mostrando 1-12 de 360 artigos, teses e dissertações.
-
1. Bioprosthetic Aortic Valve Degeneration: a Review from a Basic Science Perspective
Abstract Introduction: The increase in the prevalence of aortic stenosis due to an aging population has led to an increasing number of surgical aortic valve replacements. Over the past 20 years, there has been a major shift in preference from mechanical to bioprosthetic valves. However, despite efforts, there is still no "ideal" bioprosthesis. It is crucial
Brazilian Journal of Cardiovascular Surgery. Publicado em: 2022
-
2. Distant populations of a Xanthosoma (Araceae) species have different floral scents but the same cyclocephaline beetle pollinators
ABSTRACT We report on the reproductive biology, pollinators, and thermogenesis of the widely distributed Araceae species, Xanthosoma striatipes. We analyzed the floral scent in one population and compared it to a previous study. Xanthosoma striatipes was studied at three sites in Brazil, São Paulo, Minas Gerais and Maranhão. The results showed constancy of
Acta Bot. Bras.. Publicado em: 2020-09
-
3. SEQUÊNCIA DIDÁTICA PARA A PROMOÇÃO DE ESTUDO PRÁTICO E MULTIDISCIPLINAR COM MATERIAIS ACESSÍVEIS
Innovation and multidisciplinarity are the way to accelerate improvements in education, as well as the search for contextualized content. The multidisciplinarity between chemistry and Biology, allows to explore various contents, one of them is the environment. Works that offer alternatives to simpler experiments are of great help professors. In this context,
Quím. Nova. Publicado em: 2020-05
-
4. O debate inesgotável: causas sociais e biológicas do colapso demográfico de populações ameríndias no século XVI
Resumo No século XX, estimativas populacionais para o hemisfério ocidental, as Américas, sobre o período que antecedeu à chegada de Colombo variaram entre dez milhões até mais de cem milhões. Essa grande discrepância é fundamental para avaliar o peso das epidemias na brusca redução demográfica que se seguiu. O fato é que houve um colapso demogr
Bol. Mus. Para. Emílio Goeldi. Ciênc. hum.. Publicado em: 02/12/2019
-
5. Cucumber mosaic virus resistance and reproductive biology of brazilian melon accessions
Resumo No meloeiro (Cucumis melo), a resistência ao Cucumber mosaic virus (CMV) e o conhecimento sobre características reprodutivas são importantes para escolha de genitores de populações de melhoramento. Desta forma, objetivou-se verificar se diferentes acessos de meloeiro em um banco de germoplasma brasileiro possuem resistência ao CMV (estirpe FNY)
Rev. Bras. Frutic.. Publicado em: 10/10/2019
-
6. Risk of genetic vulnerability and aspects of the reproductive biology of Psychotria ipecacuanha (Rubiaceae), a threatened medicinal plant species of Brazilian forests
ABSTRACT Psychotria ipecacuanha, commonly known as Ipeca, is a medicinal plant of pharmacological and economic value. The species is distylous; it has populations with two floral morphs, one with long and one with short styles. Apart from the presence of two floral morphs in a balanced ratio (1:1), reciprocal herkogamy of the reproductive organs between alte
Acta Bot. Bras.. Publicado em: 12/09/2019
-
7. Usefulness of a multiplex PCR for the rapid identification of Candida glabrata species complex in Mexican clinical isolates
ABSTRACT Candida glabrata complex includes three species identified through molecular biology methods: C. glabrata sensu stricto , C. nivariensis and C. bracarensis . In Mexico, the phenotypic methods are still used in the diagnosis; therefore, the presence of C. nivariensis and C. bracarensis among clinical isolates is still unknown. The aim of this study w
Rev. Inst. Med. trop. S. Paulo. Publicado em: 08/08/2019
-
8. Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, Brazil
RESUMO Um estudo de campo sobre a proporção sexual, relação peso-comprimento, tamanho de primeira maturação gonadal e o período reprodutivo da pirarara, Phractocephalus hemioliopterus foi realizado na região do Médio Rio Xingu, na Amazônia oriental. Os espécimes foram coletados trimestralmente entre setembro de 2012 e janeiro de 2014, utilizando r
Neotrop. ichthyol.. Publicado em: 18/07/2019
-
9. Relative growth and population dynamics of Macrobrachium iheringi (Decapoda, Palaemonidae)
Abstract During the ontogenetic development of crustaceans, the relative growth of some structures may change, especially during the transition from juvenile to adult. This study describes the relative growth of body structures of Macrobrachium iheringi, and provides information on its population dynamics, such as structure, fecundity, and morphological sexu
Pap. Avulsos Zool.. Publicado em: 20/05/2019
-
10. Sexual dimorphism in the catfish Genidens genidens (Siluriformes: Ariidae) based on otolith morphometry and relative growth
RESUMO Genidens genidens é uma espécie suscetível a declínios populacionais, tendo em vista as peculiaridades de sua reprodução. Diferenças morfométricas entre os sexos são observadas na literatura, e essas diferenças também devem ser evidentes no desenvolvimento dos otólitos. O padrão de crescimento é uma das características biológicas mais
Neotrop. ichthyol.. Publicado em: 25/04/2019
-
11. Population and reproductive biology of two caprellid species (Crustacea: Amphipoda) associated to Sargassum cymosum (Phaeophyta: Fucales) on the southeast coast of Brazil
Abstract Caprellid amphipods are common crustaceans at Sargassum beds of southeastern Brazil and constitute an important link between primary producers and marine consumers. The goal of this study is to evaluate population and reproductive biology of two caprellid species: Paracaprella tenuis Mayer, 1903 and Pseudaeginella montoucheti Quitete, 1971. Sargassu
Nauplius. Publicado em: 28/03/2019
-
12. Genetic diversity and population structure of naturally rare Calibrachoa species with small distribution in southern Brazil
Abstract Calibrachoa is a South-American genus comprising 27 species, several considered endemic or rare; few were subjects in genetic studies. We attempted to generate new data about the phylogenetically related and rare species C. eglandulata, C. sendtneriana, C. serrulata, and C. spathulata concerning their genetic diversity and population structure, whic
Genet. Mol. Biol.. Publicado em: 11/03/2019