Results 81 to 90 of about 5,655 (187)

Manganese‐Doped Mesoporous Bioactive Glasses

open access: yesInternational Journal of Ceramic Engineering &Science, Volume 8, Issue 4, July 2026.
Mn‐containing, P2O5‐free 85S mesoporous bioactive glasses (MBGs) with the composition (85SiO2–(15 − x)CaO–xMnO mol%, x = 1, 2, 3, and 4) were synthesized and characterized. The glasses retained mesoporosity, enabling rapid hydroxycarbonate apatite formation and supporting cytocompatibility.
Emanuela C. Luna   +7 more
wiley   +1 more source

Ictiofauna do rio Una, Vale do Paraíba do Sul Paulista, sudeste do Brasil

open access: yes, 2018
Made available in DSpace on 2019-09-11T20:51:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2018Resumo: Este trabalho teve como objetivo realizar o inventário da ictiofauna do rio Una, afluente do rio Paraíba do Sul na região do Vale do Paraíba ...
Honorio, Juliano Rodrigues   +1 more
core   +1 more source

Characterisation of Drought and Wet Events in the Paraíba do Sul River Basin—Brazil

open access: yesInternational Journal of Climatology, Volume 46, Issue 9, July 2026.
Trend analysis identified statistically significant reductions in precipitation (at the 5% significance level) at specific pluviometric stations in São Paulo and Rio de Janeiro, while other areas, mainly in Minas Gerais, experienced significant increases in annual and seasonal rainfall, particularly during summer and spring. These significant trends at
Gildo Rafael de Almeida Santana   +4 more
wiley   +1 more source

QUALIDADE DA ÁGUA DO RIO PARAÍBA DO SUL

open access: yes, 2018
O rio Paraíba do Sul é um ecossistema de grande importância, pois suas águas são utilizadas, tanto para consumo doméstico e industrial, como para a produção de energia, suprindo cerca de 90% da demanda do município do Rio de Janeiro e arredores. O trecho
Coelho, Gabriel Ávila   +2 more
core  

Conflitos pelo acesso e uso da água : integração do rio São Francisco com a Paraíba (eixo leste) [PDF]

open access: yes, 2013
No Brasil, ao longo do tempo, quase sempre as lutas por terra antecederam as lutas por água. No entanto, neste momento, o conflito que mais se destaca na região Nordeste é o que envolve o a “Transposição do Rio São Francisco”, atualmente nominado de ...
Franklyn Barbosa de Brito   +1 more
core  

Thymus and Leishmania at the Crossroads: Autoimmunity and Cancer

open access: yesImmunology, Volume 178, Issue 3, Page 377-386, July 2026.
Conceptual ‘Crossroads Model’ linking Leishmania, thymic infection and immune dysregulation: an integrative model is proposed in which Leishmania infection disrupts thymic architecture and stromal–thymocyte interactions. These alterations converge to promote defective tolerance, increased autoimmune risk and a microenvironment permissive to malignant ...
Alef Batista Bezerra Barros   +5 more
wiley   +1 more source

Caracterização Fotoestratigráfica e Petrofaciológica dos Cordões Arenosos Litorâneos do Delta do Rio Paraíba do Sul, RJ

open access: yes, 2019
O estudo do delta holocênico do rio Paraíba do Sul (RJ) a partir da interação de dados fotoestratigráficos, texturais e de minerais pesados, permitiu a delineação de petrofácies relacionadas a diversas rochas-fonte e processos sedimentares.
Silveira, Luís Fernando   +5 more
core  

Habitat Suitability for a Unique, Fully Marine American Manatee (Trichechus manatus) Population Primarily Depends on Presence of Submarine Freshwater Springs

open access: yesMarine Mammal Science, Volume 42, Issue 3, July 2026.
ABSTRACT The American manatee (Trichechus manatus) requires freshwater mainly from rivers and springs to maintain osmoregulatory balance in saline environments. However, in Brazil's semi‐arid Potiguar Basin, manatees now rely solely on submarine freshwater springs because hypersaline estuaries have become unsuitable sources of freshwater.
A. C. O. Meirelles   +7 more
wiley   +1 more source

Spatiotemporal Evolution of Hydroclimatic Variables in the Brazilian Semi‐Arid Region Through the Aridity Index and Susceptibility to Desertification

open access: yesInternational Journal of Climatology, Volume 46, Issue 8, 30 June 2026.
Over the past 60 years, noticeable changes have been observed in the main hydroclimatological variables, driven by both natural and anthropogenic factors. In the context of climate change, such behaviour may adversely affect the state's economic activities, as well as increase the recurrence of extreme events in the region.
Ronaldo Guilherme Santos Lima   +4 more
wiley   +1 more source

A ocupação humana e o rio Paraíba do Sul no Vale do Paraíba paulista entre os séculos XVI e XVIII

open access: yes, 2023
A história do Vale do Paraíba paulista está intimamente ligada ao rio Paraíba do Sul e aos outros corpos d’água que integram a sua bacia. A análise busca a reflexão sobre as formas de utilização do rio Paraíba do Sul em seu território paulista ...
Almeida, Giovana Guedes
core  

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