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    <title>DSpace Coleção: Artigo em periódico indexado (CPAA)</title>
    <link>https://www.alice.cnptia.embrapa.br/alice/handle/item/97</link>
    <description>Artigo em periódico indexado (CPAA)</description>
    <pubDate>Thu, 09 Jul 2026 20:05:35 GMT</pubDate>
    <dc:date>2026-07-09T20:05:35Z</dc:date>
    <item>
      <title>Efeito anti-helmíntico in vitroda espécie Andira vermifugacontra Neoechinorhynchus buttnerae.</title>
      <link>https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188102</link>
      <description>Título: Efeito anti-helmíntico in vitroda espécie Andira vermifugacontra Neoechinorhynchus buttnerae.
Autoria: PEREIRA, T. B.; LOPES, E. V.; CHAGAS, E. C.; PEREIRA, D. da S.; POHLIT, A. M.
Conteúdo: RESUMO: A infecção pelo acantocéfaloNeoechinorhynchus buttneraeconstitui um dos principais entraves à produção de tambaqui (Colossoma macropomum) na Amazônia. Este estudo avaliou a atividade anti-helmíntica in vitrode extratos e frações deAndira vermifugacontraN. buttnerae. As folhas foram secas, trituradas e submetidas à maceração sequencial com solventes de polaridade crescente (hexano, acetato de etila e metanol). O extrato metanólico e as frações hidroalcoólicas dos extratos hexânico e de acetato de etila foram testados in vitrocontra acantocéfalos de tambaquis naturalmente infectados. Todas as amostras promoveram 100% de mortalidade deN. buttneraeapós 24 h nas concentrações de 25 e 50 mg/L. A fração hidroalcoólica do extrato em acetato de etila foi a mais promissora, atingindo 100% de mortalidade em 6 h a 25 mg/L e apresentando elevada eficácia mesmo em baixas concentrações. Os resultados evidenciam o potencial de extratos de média polaridade de plantas amazônicas como fonte de compostos antiparasitários eficazes no controle de infecções que afetam a piscicultura do tambaqui. ABSTRACT: Infection by the acanthocephalan Neoechinorhynchus buttnerae is one of the main obstacles totambaqui (Colossoma macropomum) production in the Amazon. This study evaluated the in vitro anthelmintic activity of extracts and fractions of Andira vermifuga against N. buttnerae. The leaves were dried, crushed, and subjected to sequential maceration with solvents of increasing polarity (hexane, ethyl acetate, and methanol). The methanolic extract and the hydroalcoholic fractions of the hexane and ethyl acetate extracts were tested in vitro against acanthocephalans of naturally infected tambaqui. All samples promoted 100% mortality of N. buttnerae after 24 h at concentrations of 25 and 50 mg/L. The hydroalcoholic fraction of the ethyl acetate extract was the most promising, achieving 100% mortality in 6 hours at 25 mg/L and showing high efficacy even at low concentrations. The results highlight the potential of medium-polarity extracts from Amazonian plants as a source of effective antiparasitic compounds for controlling infections affecting tambaqui fish farming. RESUMEN: La infección por el acantocéfalo Neoechinorhynchus buttnerae es uno de los principales obstáculos para la producción de tambaquí (Colossoma macropomum) en la Amazonía. Este estudio evaluó la actividad antihelmíntica in vitro de extractos y fracciones de Andira vermifuga contra N. buttnerae. Las hojas se secaron, trituraron y se sometieron a maceración secuencial con solventes de polaridad creciente (hexano, acetato de etilo y metanol). El extracto metanólico y las fracciones hidroalcohólicas de los extractos de hexano y acetato de etilo se probaron in vitro contra acantocéfalos de tambaquí infectado naturalmente. Todas las muestras promovieron una mortalidad del 100% de N. buttnerae después de 24 h a concentraciones de 25 y 50 mg/L. La fracción hidroalcohólica del extracto de acetato de etilo fue la más prometedora, alcanzando una mortalidad del 100 % en 6 horas a 25 mg/L y mostrando una alta eficacia incluso a bajas concentraciones. Los resultados destacan el potencial de los extractos de polaridad media de plantas amazónicas como fuente de compuestos antiparasitarios eficaces para el control de infecciones que afectan a la piscicultura de tambaquí.</description>
      <pubDate>Thu, 01 Jan 2026 00:00:00 GMT</pubDate>
      <guid isPermaLink="false">https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188102</guid>
      <dc:date>2026-01-01T00:00:00Z</dc:date>
    </item>
    <item>
      <title>Geographical traceability of Manilkara huberi (Ducke) A. Chev. by chemical signature.</title>
      <link>https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187826</link>
      <description>Título: Geographical traceability of Manilkara huberi (Ducke) A. Chev. by chemical signature.
Autoria: SILVA, A. C. L. da; LOPES, M. T. G.; TOMAZ, J. S.; VALENTE, M. S. F.; BEZERRA, C. de S.; CAPUCHO, H. L. V.; MARQUES, R. L. S.; LOPES, R.; PEREIRA, A. M.; FERREYRA RAMOS, S. L.
Conteúdo: This study evaluated the potential of Total Reflection X-ray Fluorescence (TXRF) as a geochemical traceability method for wood from Manilkara huberi (Ducke) A. Chev., a species of high commercial and ecological value widely exploited in the Legal Amazon. Wood samples were collected in eight locations in the states of Amazonas, Pará, Rondônia, and Roraima, representing different edaphic, geological, and climatic conditions in the context of Amazonian edaphic and geological variability. The multielemental analysis revealed significant variations in trace element and macronutrient concentrations (Fe, Mn, K, Ca, Sr, Rb), reflecting the specific geochemical signatures of each region. Multivariate analyses (PCA and NMDS) showed distinct groupings among the populations, confirming the discriminatory capacity of TXRF in the differentiation of geographical origins. Significant correlations between elements such as K × Rb and Cr × Fe demonstrated consistent patterns of coaccumulation and antagonism associated with local geochemistry. The results prove the efficiency of TXRF as a non-destructive, sensitive, and low-cost technique for origin authentication and forensic investigation of Amazonian wood, strengthening sustainable management policies and combating illegal exploitation. The proposed methodology is a scientific advance in forest traceability and biodiversity conservation, contributing to the transparency and legality of timber production chains in the Amazon.</description>
      <pubDate>Thu, 01 Jan 2026 00:00:00 GMT</pubDate>
      <guid isPermaLink="false">https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187826</guid>
      <dc:date>2026-01-01T00:00:00Z</dc:date>
    </item>
    <item>
      <title>A modeling framework to assess climate vulnerability and future distributions of tropical tree species: a case study on Brazilian ipês.</title>
      <link>https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187793</link>
      <description>Título: A modeling framework to assess climate vulnerability and future distributions of tropical tree species: a case study on Brazilian ipês.
Autoria: BORBA, F. de C.; BEZERRA, C. de S.; TOMAZ, J. S.; MARQUES, M. J.; CAPUCHO, H. L. V.; SOUZA, S. F. de; FERREYRA RAMOS, S. L.; LOPES, R.; MENESES, C. H. S. G. de; LOPES, M. T. G.
Conteúdo: Assessing climate vulnerability of tropical trees requires ecological niche modeling frameworks capable of integrating multiple sources of uncertainty. Here, we present an integrated modeling approach that combines climatic, edaphic, and topographic predictors, dimensionality reduction, multi-algorithm calibration, and ensemble forecasting to evaluate future environmental suitability under climate change. Using two Brazilian Handroanthus species as a case study, occurrence data were spatially filtered, predictors were summarized through principal component analysis, and models were built using six algorithms with performance-weighted consensus projections. Future distributions were projected for three time periods (2041–2060, 2061–2080, and 2081–2100) under intermediate and high emission scenarios (SSP2-4.5 and SSP5-8.5). The framework showed high predictive reliability and revealed contrasting vulnerability patterns, including severe suitability losses for one species and greater stability for the other across phytogeographic domains. Beyond species-specific outcomes, results demonstrate how integrated Ecologial Niche Modeling (ENM) frameworks can identify climate-driven risk gradients and support climate-informed conservation, forest management, and territorial planning in tropical regions.</description>
      <pubDate>Thu, 01 Jan 2026 00:00:00 GMT</pubDate>
      <guid isPermaLink="false">https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187793</guid>
      <dc:date>2026-01-01T00:00:00Z</dc:date>
    </item>
    <item>
      <title>Characterization and selection of native rhizobia from amazonian soils for Vigna unguiculata (l.) Walp.</title>
      <link>https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187603</link>
      <description>Título: Characterization and selection of native rhizobia from amazonian soils for Vigna unguiculata (l.) Walp.
Autoria: MAJOLO, C.; SANTOS, J. P. dos; PERIN, R.; RIBEIRO, N. H. S.; ABREU, J. A. A. de; SANTOS, S. F.; SILVA, E. L. da; REIS, V. R.; NOGUEIRA, M. A.; MUNIZ, A. W.
Conteúdo: ABSTRACT: Cowpea (Vigna unguiculata) is a legume of great socioeconomic importance in Brazil, particularly in the North and Northeast regions, where it accounts for about 30% of the country’s total bean production. It plays a critical role in food security and income generation for smallholder farmers, especially in challenging environments such as the Amazon. However, cowpea yield remains limited due to low technology adoption and poor management practices. Biological nitrogen fixation (BNF), mediated by symbiotic bacteria such as Bradyrhizobium and Rhizobium, offers a sustainable alternative to chemical fertilizers. This study aimed to isolate and characterize rhizobia from distinct Amazonian soils (Floodplain, Amazonian dark earth, and Oxisol). The isolates were evaluated in greenhouse conditions for cowpea growth promotion and characterized by 16S rRNA gene sequencing. Shoot dry mass (SDM) ranged from 736.67 to 2,220 mg per plant, and shoot dry mass nitrogen (SDMN) from 17.09 to 66.85 mg per plant. Most isolates promoted nodulation, with Rhizobium predominating, and several isolates showed similar agronomic performance, not statistically different from the recommended strain SEMIA 6462. The results indicate the potential of these native isolates for use as bioinoculants adapted to Amazonian conditions. These findings highlight the potential of native rhizobia as candidates for the development of bioinoculants adapted to Amazonian conditions. Caracterização e seleção de rizóbios nativos de solos amazônicos para Vigna unguiculata (l.) Walp. RESUMO: O feijão-caupi (Vigna unguiculata) é uma leguminosa de grande importância socioeconômica no Brasil, especialmente nas regiões Norte e Nordeste, onde responde por cerca de 30% da produção nacional de feijão. Sua relevância está associada à segurança alimentar e à geração de renda para pequenos produtores, sobretudo em ambientes de cultivo adversos, como os da Amazônia. Entretanto, sua produtividade é limitada pelo baixo uso de tecnologias e manejo inadequado. A fixação biológica de nitrogênio (FBN), mediada por bactérias simbióticas como Bradyrhizobium e Rhizobium, constitui uma alternativa sustentável aos fertilizantes químicos. Este estudo teve como objetivo isolar e caracterizar rizóbios oriundos de solos amazônicos distintos (várzea, terra preta de índio e latossolo). As bactérias isoladas foram avaliadas em casa de vegetação quanto à promoção de crescimento do caupi e caracterizadas por sequenciamento do gene 16S rRNA. A massa seca da parte aérea (MSPA) variou de 736,67 a 2.220 mg por planta, e o acúmulo de nitrogênio (N-MSPA), de 17,09 a 66,85 mg por planta. A maioria dos isolados promoveu nodulação, com predominância do gênero Rhizobium, e vários isolados apresentaram desempenho agronômico semelhante, não diferindo estatisticamente da estirpe recomendada SEMIA 6462. Os resultados indicam o potencial desses rizóbios nativos como candidatos para o desenvolvimento de bioinoculantes adaptados às condições amazônicas.</description>
      <pubDate>Thu, 01 Jan 2026 00:00:00 GMT</pubDate>
      <guid isPermaLink="false">https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187603</guid>
      <dc:date>2026-01-01T00:00:00Z</dc:date>
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