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  Subjects -> HISTORY (Total: 1486 journals)
    - HISTORY (895 journals)
    - History (General) (58 journals)
    - HISTORY OF AFRICA (59 journals)
    - HISTORY OF ASIA (60 journals)
    - HISTORY OF AUSTRALASIA AREAS (9 journals)
    - HISTORY OF EUROPE (201 journals)
    - HISTORY OF THE AMERICAS (153 journals)
    - HISTORY OF THE NEAR EAST (51 journals)

HISTORY (895 journals)                  1 2 3 4 5 | Last

Showing 1 - 200 of 452 Journals sorted alphabetically
40 [degrees] South     Full-text available via subscription   (Followers: 3)
Aboriginal History     Full-text available via subscription   (Followers: 9)
Abstracta Iranica     Open Access   (Followers: 14)
Acadiensis : Journal of the History of the Atlantic Region / Acadiensis : revue d'histoire de la region Atlantique     Full-text available via subscription   (Followers: 4)
Accounting History Review     Hybrid Journal   (Followers: 20)
Acta Amazonica     Open Access   (Followers: 6)
Acta Historiae Artium     Full-text available via subscription   (Followers: 4)
Acta Musei Nationalis Pragae ? Historia litterarum     Open Access  
Acta Orientalia     Full-text available via subscription   (Followers: 19)
Actes d'Història de la Ciència i de la Tècnica     Open Access   (Followers: 1)
Advances in Historical Studies     Open Access   (Followers: 7)
Advances in Software Engineering     Open Access   (Followers: 10)
Africa Confidential     Hybrid Journal   (Followers: 21)
Africa Research Bulletin: Political, Social and Cultural Series     Hybrid Journal   (Followers: 11)
Africa Today     Full-text available via subscription   (Followers: 19)
African and Asian Studies     Hybrid Journal   (Followers: 25)
African Diaspora     Open Access   (Followers: 9)
African Historical Review     Hybrid Journal   (Followers: 17)
African Natural History     Open Access   (Followers: 2)
Agora     Full-text available via subscription   (Followers: 5)
Agricultural History Review     Full-text available via subscription   (Followers: 11)
Akroterion     Full-text available via subscription   (Followers: 6)
Al-Masaq: Islam and the Medieval Mediterranean     Hybrid Journal   (Followers: 27)
albuquerque : revista de história     Open Access  
Almagest     Full-text available via subscription  
Altorientalische Forschungen     Hybrid Journal   (Followers: 7)
American Archivist     Hybrid Journal   (Followers: 189)
American Communist History     Hybrid Journal   (Followers: 18)
American Jewish History     Full-text available via subscription   (Followers: 16)
American Nineteenth Century History     Hybrid Journal   (Followers: 25)
American Periodicals : A Journal of History, Criticism, and Bibliography     Full-text available via subscription   (Followers: 7)
American Review of Canadian Studies     Hybrid Journal   (Followers: 7)
American Studies     Full-text available via subscription   (Followers: 21)
Amérique Latine Histoire et Mémoire     Open Access   (Followers: 2)
Amsterdamer Beitrage zur alteren Germanistik     Full-text available via subscription   (Followers: 2)
Anadolu Araştırmaları     Open Access  
Anais do Museu Paulista : História e Cultura Material     Open Access  
Analecta Bollandiana     Full-text available via subscription   (Followers: 2)
Anales de Historia del Arte     Open Access   (Followers: 6)
Anatolica     Full-text available via subscription   (Followers: 13)
Ancient Civilizations from Scythia to Siberia     Hybrid Journal   (Followers: 12)
Ancient History : Resources for Teachers     Full-text available via subscription   (Followers: 6)
Ancient Mesoamerica     Hybrid Journal   (Followers: 10)
Anglican Historical Society Journal     Full-text available via subscription   (Followers: 3)
Anglo-Saxon England     Hybrid Journal   (Followers: 34)
Annales historiques de la Révolution française     Open Access   (Followers: 9)
Annali dell'Istituto e Museo di storia della scienza di Firenze     Hybrid Journal  
Annuaire de l'Ecole pratique des hautes etudes. Section des sciences historiques et philologiques     Open Access   (Followers: 6)
Annual Bulletin of Historical Literature     Hybrid Journal   (Followers: 12)
ANQ: A Quarterly Journal of Short Articles, Notes, and Reviews     Hybrid Journal   (Followers: 1)
Antike und Abendland     Hybrid Journal   (Followers: 10)
Antiteses     Open Access  
Anuario de Estudios Atlánticos     Open Access   (Followers: 1)
Anuario de Historia de la Iglesia     Open Access   (Followers: 2)
Anuario de la Escuela de Historia     Open Access  
Anuario del Departamento de Historia y Teoría del Arte     Open Access  
Arabian Humanities     Open Access   (Followers: 4)
Arabica     Hybrid Journal   (Followers: 11)
ARAM Periodical     Full-text available via subscription   (Followers: 3)
Araucaria. Revista Iberoamericana de Filosofía, Política y Humanidades     Open Access   (Followers: 1)
Archeion     Full-text available via subscription  
ArcheoArte. Rivista Elettronica di Archeologia e Arte     Open Access   (Followers: 8)
Architectural Heritage     Hybrid Journal   (Followers: 24)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 6)
Archives of Natural History     Hybrid Journal   (Followers: 7)
Area     Hybrid Journal   (Followers: 13)
Arenal. Revista de historia de las mujeres     Open Access   (Followers: 1)
Aristotelian Society Supplementary Volume     Hybrid Journal   (Followers: 3)
Arizona Journal of Hispanic Cultural Studies     Full-text available via subscription   (Followers: 3)
Armstrong Undergraduate Journal of History     Open Access  
Art History     Hybrid Journal   (Followers: 290)
Art History & Criticism     Open Access   (Followers: 1)
Arthuriana     Full-text available via subscription   (Followers: 5)
Arys: Antigüedad, Religiones y Sociedades     Open Access   (Followers: 1)
Aschkenas     Hybrid Journal   (Followers: 3)
Asia Pacific Business Review     Hybrid Journal   (Followers: 8)
Asia Pacific Journal of Education     Hybrid Journal   (Followers: 21)
Asia-Pacific Journal : Japan Focus     Open Access   (Followers: 9)
Asian Journal of Social Psychology     Hybrid Journal   (Followers: 6)
Asian Perspectives     Full-text available via subscription   (Followers: 9)
Asian Philosophy: An International Journal of the Philosophical Traditions of the East     Hybrid Journal   (Followers: 8)
Asian Review of World Histories     Hybrid Journal   (Followers: 2)
Asian Studies Review     Hybrid Journal   (Followers: 19)
Aspasia     Full-text available via subscription  
Astérion     Open Access   (Followers: 1)
Aurora Journal     Full-text available via subscription  
Austral Ecology     Hybrid Journal   (Followers: 16)
Australasian Journal of Irish Studies, The     Full-text available via subscription   (Followers: 8)
Australasian Review of African Studies, The     Full-text available via subscription   (Followers: 2)
Australian Antarctic Magazine     Free   (Followers: 4)
Australian Cultural History     Hybrid Journal   (Followers: 10)
Australian Historical Studies     Hybrid Journal   (Followers: 13)
Australian Journal of Legal History     Full-text available via subscription   (Followers: 15)
Australian Journal of Politics & History     Hybrid Journal   (Followers: 15)
Australian Slavonic and East European Studies     Open Access   (Followers: 6)
Austrian History Yearbook     Full-text available via subscription   (Followers: 9)
Balkanologie : Revue d'Études Pluridisciplinaires     Open Access   (Followers: 3)
Baltic-Pontic Studies     Open Access   (Followers: 1)
Baroque     Open Access  
Behemoth     Open Access   (Followers: 3)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 10)
BIBLOS - Revista do Departamento de Biblioteconomia e História     Open Access   (Followers: 7)
BibNum     Open Access  
Biographical Memoirs of Fellows of the Royal Society     Full-text available via subscription   (Followers: 1)
Biography     Full-text available via subscription   (Followers: 17)
Bochumer Philosophisches Jahrbuch für Antike und Mittelalter     Hybrid Journal   (Followers: 2)
Body & Society     Hybrid Journal   (Followers: 26)
Boletim Cearense de Educação e História da Matemática     Open Access  
Boletim do Arquivo da Universidade de Coimbra     Open Access  
Book History     Full-text available via subscription   (Followers: 136)
Boom : A Journal of California     Full-text available via subscription   (Followers: 1)
Britain and the World     Hybrid Journal   (Followers: 6)
British Catholic History     Hybrid Journal   (Followers: 1)
British Journal for Military History     Open Access   (Followers: 27)
British Journal for the History of Science     Hybrid Journal   (Followers: 24)
British Journal of Canadian Studies     Hybrid Journal   (Followers: 12)
British Journal of Middle Eastern Studies     Hybrid Journal   (Followers: 29)
British Mycological Society Symposia Series     Full-text available via subscription   (Followers: 1)
British Review of New Zealand Studies     Full-text available via subscription   (Followers: 4)
Bryn Mawr Classical Review     Open Access   (Followers: 44)
BSHM Bulletin: Journal of the British Society for the History of Mathematics     Hybrid Journal   (Followers: 5)
Buildings & Landscapes: Journal of the Vernacular Architecture Forum     Full-text available via subscription   (Followers: 14)
Bulletin d'histoire politique     Full-text available via subscription   (Followers: 3)
Bulletin de la Sabix     Open Access  
Bulletin de Philosophie Medievale     Full-text available via subscription   (Followers: 4)
Bulletin du centre d’études médiévales d’Auxerre     Open Access   (Followers: 4)
Bulletin d’études Orientales     Open Access   (Followers: 9)
Bulletin of Hispanic Studies     Hybrid Journal   (Followers: 11)
Bulletin of Latin American Research     Hybrid Journal   (Followers: 16)
Bulletin of Spanish Studies: Hispanic Studies and Researches on Spain, Portugal and Latin America     Hybrid Journal   (Followers: 31)
Bulletin of the Ecological Society of America     Open Access   (Followers: 4)
Bulletin of the John Rylands Library     Hybrid Journal   (Followers: 16)
Bulletin of the School of Oriental and African Studies     Hybrid Journal   (Followers: 21)
Bustan     Hybrid Journal  
Byzantine and Modern Greek Studies     Hybrid Journal   (Followers: 12)
Byzantinische Zeitschrift     Hybrid Journal   (Followers: 14)
Byzantion Nea Hellás     Open Access   (Followers: 2)
C@hiers du CRHIDI     Open Access  
Cabo     Full-text available via subscription  
Cadernos de História     Open Access  
Cadernos de História UFPE     Open Access  
CADUS - Revista de Estudos de Política, História e Cultura     Open Access  
Cahiers d'histoire     Full-text available via subscription   (Followers: 2)
Cahiers d'histoire. Revue d'histoire critique     Open Access   (Followers: 12)
Cahiers de l'Urmis     Open Access   (Followers: 1)
Cahiers des études anciennes     Open Access   (Followers: 7)
Cahiers du Centre de recherches historiques     Open Access   (Followers: 6)
Cahiers du Monde Russe     Open Access   (Followers: 11)
Cahiers d’études africaines     Open Access   (Followers: 9)
Cahiers « Mondes anciens »     Open Access   (Followers: 4)
California Italian Studies Journal     Full-text available via subscription   (Followers: 6)
Cambridge Journal of Regions, Economy and Society     Hybrid Journal   (Followers: 11)
Camden Fifth Series     Full-text available via subscription   (Followers: 3)
Canadian Historical Review     Full-text available via subscription   (Followers: 12)
Canadian Journal of History     Full-text available via subscription   (Followers: 10)
Canadian Journal of Linguistics / La revue canadienne de linguistique     Full-text available via subscription   (Followers: 9)
Canadian Review of American Studies     Full-text available via subscription   (Followers: 2)
Canadian-American Slavic Studies     Hybrid Journal   (Followers: 6)
Caribbean Studies     Full-text available via subscription   (Followers: 11)
Catholic Historical Review     Full-text available via subscription   (Followers: 15)
Cemoti, Cahiers d'études sur la méditerranée orientale et le monde turco-iranien     Open Access   (Followers: 3)
Central Asian Survey     Hybrid Journal   (Followers: 9)
Central Europe     Hybrid Journal   (Followers: 6)
Central European History     Full-text available via subscription   (Followers: 31)
Chaucer Review     Full-text available via subscription   (Followers: 7)
Childhood in the Past : An International Journal     Hybrid Journal   (Followers: 5)
Chinese Studies in History     Full-text available via subscription   (Followers: 10)
Chronica Nova. Revista de Historia Moderna de la Universidad de Granada     Open Access   (Followers: 2)
Chronique d'Egypte     Full-text available via subscription   (Followers: 5)
Church History and Religious Culture     Hybrid Journal   (Followers: 54)
Church History: Studies in Christianity and Culture     Full-text available via subscription   (Followers: 71)
Cihannuma : Journal of History and Geography Studies     Open Access  
Circe de clásicos y modernos     Open Access  
Civil War History     Full-text available via subscription   (Followers: 19)
Cleveland Studies in the History of Art     Full-text available via subscription   (Followers: 2)
CLIO : Revista de Pesquisa Histórica     Open Access  
Clio y Asociados     Open Access  
Clio. Femmes, Genre, Histoire - Articles     Open Access   (Followers: 8)
Clio. Women, Gender, History     Open Access   (Followers: 4)
Cliodynamics     Open Access   (Followers: 1)
Collections électroniques de l'INHA     Open Access   (Followers: 1)
Collingwood and British Idealism Studies     Full-text available via subscription  
Colonial Latin American Review     Hybrid Journal   (Followers: 10)
Comitatus : A Journal of Medieval and Renaissance Studies     Full-text available via subscription   (Followers: 17)
Comparative Legal History     Full-text available via subscription   (Followers: 7)
Comparative Studies of South Asia, Africa and the Middle East     Full-text available via subscription   (Followers: 27)
Comptabilités     Open Access  
Concorso. Arti e lettere     Open Access  
Conservative Judaism     Full-text available via subscription   (Followers: 4)
Conserveries mémorielles     Open Access  
Contemporaneity : Historical Presence in Visual Culture     Open Access   (Followers: 4)
Contemporary Arab Affairs     Hybrid Journal   (Followers: 4)
Contemporary British History     Hybrid Journal   (Followers: 24)
Contemporary European History     Hybrid Journal   (Followers: 26)
Contemporary French and Francophone Studies     Hybrid Journal   (Followers: 12)
Convivium     Full-text available via subscription  
Creativity Studies     Open Access   (Followers: 3)
Crime, Histoire & Sociétés     Open Access   (Followers: 6)
Critical Historical Studies     Full-text available via subscription   (Followers: 8)

        1 2 3 4 5 | Last

Journal Cover
Acta Amazonica
Journal Prestige (SJR): 0.36
Citation Impact (citeScore): 1
Number of Followers: 6  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0044-5967
Published by SciELO Homepage  [726 journals]
  • Relevance of wood anatomy and size of Amazonian trees in the determination
           and allometry of sapwood area

    • Abstract: ABSTRACT Hydrological processes in forest stands are mainly influenced by tree species composition and morpho-physiological characteristics. Few studies on anatomical patterns that govern plant hydraulics were conducted in tropical forest ecosystems. Thus, we used dye immersion to analyze sapwood area patterns of 34 trees belonging to 26 species from a terra firme forest in the central Brazilian Amazon. The sapwood area was related with wood anatomy and tree size parameters (diameter-at-breast-height - DBH, total height and estimated whole-tree volume). Exponential allometric equations were used to model sapwood area using the biometrical variables measured. Sapwood area traits (cross-section non-uniformity and heartwood visibility) varied significantly among and within species even though all were classified as diffuse porous. DBH was strongly and non-linearly correlated with sapwood area (R 2 = 0.46, P < 0.001), while no correlation was observed with vessel-lumen diameter (P = 0.94) and frequency (P = 0.58). Sapwood area and shape were also affected by the occurrence of vessel obstruction (i.e., tyloses), hollow stems and diseases. Our results suggest that sapwood area patterns and correlated variables are driven by intrinsic species characteristics, microclimate and ecological succession within the stand. We believe that individual tree sapwood characteristics have strong implications over water use, hydrological stand upsaling and biomass quantification. These characteristics should be taken into account (e.g., through a multi-point sampling approach) when estimating forest stand transpiration in a highly biodiverse ecosystem.RESUMO Processos hidrológicos de povoamentos florestais são predominantemente influenciados pela composição de espécies arbóreas e suas características morfo-fisiológicas. No entanto, existem poucos estudos sobre os padrões anatômicos que determinam o sistema hidráulico de plantas em ecossistemas tropicais. Por isso, nosso objetivo foi o de analisar os padrões da área do xilema ativo em 34 árvores de 26 espécies de uma floresta de terra firme na Amazônia central por meio de imersão em solução de corante. A área do xilema ativo foi relacionada a características autoecológicas das espécies, anatomia da madeira e parâmetros de crescimento (diametro à altura do peito - DAP, altura total e volume total). Equações alométricas exponenciais foram utilizadas para ajustar a área do xilema às variáveis medidas. Características do alburno (área transversal não-uniforme e visibilidade do cerne) variaram significativamente entre e dentro de espécies, apesar de que todas as espécies apresentaram vasos difusos. DAP foi fortemente e não-linearmente correlacionado à área do alburno (R 2 = 0,46; P < 0,001), enquanto diâmetro (P = 0,94) e frequência (P = 0.58) de vasos não apresentaram nenhum grau de relacionamento. O tamanho e forma do alburno foram afetados pela ocorrência de obstrução de poros (tilose) e troncos ocos. Estes padrões sugerem que a área do xilema é influenciada por características intrínsicas de cada espécie, microclima e estágio sucessional dentro do povoamento. Nossos resultados implicam que características individuais de árvores podem fortemente influenciar o transporte de água e, consequentemente, os processos hidrológicos e a quantificação de biomassa do povoamento. Essas caracteristicas deveriam ser consideradas (por exemplo, por meio da coleta de amostras da área do xilema ativo ao longo da área transversal) ao estimar-se a transpiração de uma floresta altamente biodiversa.
       
  • Feeding frequency affects feed intake and growth in juvenile pirarucu
           (Arapaima gigas)

    • Abstract: ABSTRACT Pirarucu is one of the main fish species for the development of aquaculture in the Amazon. In this study, the optimal feeding frequency for juvenile pirarucu was assessed based on growth and feed efficiency. Juvenile pirarucu weighing ca. 80 g were fed once, twice, three or four times daily until apparent satiation for 63 days. Fish fed three or four times per day presented higher growth, feed intake, and fat body content than those fed once or twice per day. There was no significant difference for feed conversion ratio, and protein and energy retention rates among treatments, suggesting that increased feeding frequency did not affect feed utilization efficiency. Mean feed intake per meal was higher when fish were fed once per day, possibly causing hyperphagic behavior. Results suggest that feeding three times per day was sufficient to secure adequate feeding and growth of juvenile pirarucu.RESUMO O pirarucu é uma das principais espécies de peixe para o desenvolvimento da aquicultura na região amazônica. Neste trabalho foi avaliada a frequência de alimentação ideal para juvenis de pirarucu com base em crescimento e eficiência alimentar. Juvenis de aproximadamente 80 g foram alimentados uma, duas, três ou quatro vezes ao dia até a saciedade aparente durante 63 dias. Maior crescimento, ingestão alimentar e gordura corporal foram observados nos peixes alimentados três ou quatro vezes ao dia em comparação com aqueles alimentados uma ou duas vezes ao dia. Não houve diferença significativa para as taxas de conversão alimentar, retenção proteica e retenção energética entre os tratamentos, indicando que o aumento da frequência de alimentação não resultou em prejuízo da eficiência de utilização do alimento. O consumo médio de alimento por refeição foi maior nos peixes alimentados apenas uma vez ao dia, que provavelmente desenvolveram comportamento hiperfágico. Os resultados sugerem que três refeições diárias foram suficientes para garantir o consumo de alimento e crescimento adequados nessa fase.
       
  • A new termite species of the genus Dihoplotermes Araújo (Blattaria,
           Isoptera, Termitidae) from the Brazilian Amazonian rainforest

    • Abstract: ABSTRACT Dihoplotermes, a previously monotypic genus, is now composed of two species. Dihoplotermes taurus sp. nov., a new Termitinae termite species, is illustrated and described based on morphological characters from soldiers, workers, and imago. The new species is distinguished from Dihoplotermes inusitatus Araujo by having a spine-like protuberance with blunt apex on the postmentum, the presence of a spine on the gizzard and the absence of dimorphic soldiers. Furthermore, the internal morphological characteristics of a Dihoplotermes worker are described for the first time. Both internal and external morphological characters were used to improve the characterization of the species.RESUMO Dihoplotermes, que era um gênero monotípico, agora é composto por duas espécies. Dihoplotermes taurus sp. nov., uma nova espécie de cupim Termitinae, é descrita e ilustrada com base nos caracteres morfológicos dos soldados, operários e imago. A nova espécie se diferencia de Dihoplotermes inusitatus Araujo por apresentar uma protuberância em forma de espinho não pontiagudo no posmento, presença de um espinho na moela e ausência de soldados dimórficos. Além disso, são descritas pela primeira vez as características morfológicas internas de um operário de Dihoplotermes e utilizamos ambos caracteres morfológicos internos e externos para melhor caracterizar as espécies.
       
  • Predation of an American fruit-eating bat (Artibeus sp.) by an Amazon tree
           boa (Corallus hortulanus) in the northern Brazilian Amazon

    • Abstract: ABSTRACT We report an observation of predation by an Amazon tree boa, Corallus hortulanus, on an American fruit-eating bat, Artibeus sp., in an area of seasonal forest close to a small stream in the northern Brazilian Amazon. While bats appear to be one of the main food items of C. hortulanus, our observation is only the fourth such event to be recorded in the Brazilian Amazon. The Artibeus sp. individual was observed making distress (agony) calls continuously over a period of three hours, much longer than recorded on previous observations. Records of this type are important to further our knowledge on bat predators, and the defensive behavior of bats.RESUMO Nós relatamos uma observação de predação por uma serpente Corallus hortulanus sobre um morcego do gênero Artibeus em uma área de floresta estacional perto de um córrego, no norte da Amazônia brasileira. Enquanto os morcegos parecem ser um dos principais itens alimentares de C. hortulanus, a nossa observação representa somente o quarto relato para a Amazônia brasileira. O indivíduo de Artibeus sp. foi observado vocalizando com chamados de distress (agonia) durante um período de três horas, o que representa uma duração muito maior do que o reportado em registros anteriores. Registros deste tipo são extremamente importantes para aumentar o nosso conhecimento sobre os predadores de morcegos e sobre o comportamento de defesa dos morcegos.
       
  • Foliar anatomy of Rhynchosia spp. (Leguminosae, Papilionoideae) from
           Roraima state, northern Brazilian Amazon

    • Abstract: ABSTRACT Comparative studies on the structure of foliar anatomy in four species of Rhynchosia from Roraima state (northern Brazilian Amazon) were carried out to identify additional morphological characters to support the definition of the systematic boundaries among the species. Fully expanded leaves, including the petioles, were collected from the upper nodes of a plant’s stem. Anatomical characters were observed in cross-sections of the middle portion of leaflets and petiole segments. Presence and distribution of glandular trichomes, continuity of sclerenchyma around the vascular bundles in leaflet blades and the conformation of the area between the two ridges of petioles were important characters to distinguish among the species of Rhynchosia. For the first time we report a distinct multicellular gland-like structure which we found in the petioles of three species.RESUMO Estudos comparativos da estrutura anatômica foliar foram realizados para identificar caracteres morfológicos adicionais para a caracterização sistemática de quatro espécies de Rhynchosia ocorrentes em Roraima. Folhas completamente expandidas, incluindo o pecíolo, foram coletadas nos nós superiores da planta. Os caracteres anatômicos foram estudados a partir de observações de cortes tranversais da região mediana de folíolos e pecíolos. A presença e a distribuição de tricomas glandulares, a continuidade do esclerênquima em torno dos feixes vasculares nos folíolos e a conformação da região entre as duas alas nos pecíolos se mostraram importantes caracteres para a distinção das espécies amazônicas de Rhynchosia. Também foi registrada pela primeira vez a ocorrência de uma diferenciada estrutura similar a glândula nos pecíolos de três espécies.
       
  • New records of three Neotropical arboreal ant species of Camponotus,
           subgenus Dendromyrmex (Hymenoptera: Formicidae) for the southern Amazon,
           including biological information

    • Abstract: ABSTRACT Camponotus (Formicinae) is the most specious and abundant genus of the family Formicidae. The genus is represented by ants that both forage and nest in the most diverse terrestrial and arboreal environments. Among the arboreal species of Camponotus are those of the subgenus Dendromyrmex. We recorded, for the first time, evidence of Camponotus chartifex (Smith, 1860) in the state of Mato Grosso, Brazil, and expanded the distributions of Camponotus nidulans (Smith, 1860) and Camponotus apicalis (Mann, 1916). We include information on the biology of the species and a discussion on the sampling of arboreal and winged ants.RESUMO Camponotus é um dos gêneros mais especiosos e abundantes da subfamília Formicidae. O gênero é representado por formigas que se alimentam e nidificam nos mais diversos habitats de ambientes terrestres e arbóreos. Entre as espécies arborícolas de Camponotus, estão as do subgênero Dendromyrmex. Registramos, pela primeira vez, Camponotus chartifex (Smith, 1860) para o estado de Mato Grosso, Brasil, e expandimos a distribuição de Camponotus nidulans (Smith, 1860) e Camponotus apicalis (Mann, 1916), incluindo informações biológicas sobre as espécies e uma discussão sobre a amostragem de formigas arborícolas e aladas.
       
  • Evaluation of the antioxidant potential of Copaifera multijuga in Ehrlich
           tumor-bearing mice

    • Abstract: ABSTRACT Copaifera multijuga, commonly known as copaiba, is popularly used in the form of tea for various conditions due to the presence of antioxidant substances in its composition, which protect cells against damage caused by free radicals. Its oleoresin is also used as an anti-inflammatory and antitumoral agent. The present study investigated the antioxidant effect of the ethanolic extract of copaiba stem bark on Swiss mice inoculated with solid Ehrlich tumors. Mice were inoculated subcutaneously with 1x106 Ehrlich’s tumor cells and treated via gavage with ethanolic extract of copaiba for thirty days, with doses varying between 100 and 200 mg kg-1. Biochemical analyses of enzymatic antioxidants [superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST)], non-enzymatic antioxidants [reduced glutathione (GSH) and ascorbic acid (ASA)], substances reactive to thiobarbituric acid (TBARS) and protein carbonylation (carbonyl) in different tissues were significantly affected. The extract administered at 200 mg kg-1 presented higher antioxidant capacity in the liver, increased CAT, GST, GSH and decreased TBARS, as well as increased CAT activity and protein carbonylation in brain tissue. The results showed that the copaiba extract was able to reverse the oxidative stress caused by solid Ehrlich tumor, probably due to the presence of antioxidant compounds, and had potential antineoplasic effect after a 30-day treatment.RESUMO Copaifera multijuga, ou copaíba, é utilizada popularmente como chá para o tratamento de diversas afecções, o que se deve à presença de substâncias antioxidantes em sua composição, que protegem as células contra danos causados pelos radicais livres. O óleo-resina da árvore é usado como antiinflamatório e antitumoral. O presente estudo avaliou o efeito antioxidante do extrato etanólico da casca da copaíba sobre camundongos Swiss machos inoculados com tumor sólido de Ehrlich. Os camundongos foram inoculados subcutaneamente com 1x106 células de tumor de Ehrlich e foram tratados, via gavagem durante 30 dias, com doses de extrato etanólico de copaíba variando de 100 a 200 mg kg-1. Realizou-se análise bioquímica dos antioxidantes enzimáticos [superóxido dismutase (SOD), catalase (CAT), glutationa-S-transferase (GST)], antioxidantes não-enzimáticos [glutationa reduzida (GSH) e ácido ascórbico (ASA)], substâncias reativas ao ácido tiobarbitúrico (TBARS) e carbonilação proteica (carbonil) em diferentes tecidos e apresentando resultados significativos. O extrato administrado na concentração de 200 mg kg-1 apresentou melhor capacidade antioxidante no fígado, aumentando a CAT, GST, GSH e diminuindo TBARS, além de aumentar a atividade da CAT e da carbonilação proteica no tecido cerebral. Os resultados mostram que o extrato de copaíba foi capaz de reverter o estresse oxidativo causado pelo tumor sólido de Ehrlich, provavelmente por conter compostos antioxidantes, e possivelmente teve um efeito antineoplásico após 30 dias de tratamento.
       
  • Phenolic compounds from Virola venosa (Myristicaceae) and evaluation of
           their antioxidant and enzyme inhibition potential

    • Abstract: ABSTRACT Virola venosa, popularly known in Brazil as ucuuba-da-mata, occurs naturally in the Amazon region and has potential to provide useful natural compounds, as already known for other Virola species. Therefore, the objective of this study was to determine the chemical composition of bark and leaf extracts of V. venosa, and to test the antioxidant capacity and α-glucosidase inhibition potential of their compounds. Polar extracts showed to be more active in both assays, therefore a bioactivity-guided fractionation was performed to identify the compounds that were responsible for the recorded activities. Using a combination of LC-MS/MS analysis and isolation with NMR identification, eight phenolic compounds were identified. Assays with pure compounds of the active fraction revealed that ferulic acid was the main contributor compound to the observed bioactivity in the crude extracts.Resumo Virola venosa, popularmente conhecida como ucuuba-da-mata, ocorre naturalmente na região amazônica e tem potencial para fornecer compostos naturais úteis, como já foi mostrado para outras espécies de Virola. Por isso, o objetivo deste estudo foi determinar a composição química dos extratos do tronco e das folhas de V. venosa e os possíveis potenciais antioxidantes e de inibição contra α-glucosidase de seus compostos. Os extratos polares mostraram-se mais ativos em ambos os testes, portanto, um fracionamento guiado por bioatividade foi realizado para designar os compostos responsáveis pelas atividades registradas. Através da combinação de análise CL-EM/EM e isolamento com identificação por RMN, foram identificados oito compostos fenólicos. Testes com os compostos puros principais das frações mais ativas indicaram o ácido ferúlico como o principal contribuinte das atividades biológicas observadas para os extratos brutos, e, consequentemente, o princípio ativo principal de V. venosa.
       
  • Hydrological calibration and validation of the MGB-IPH model for water
           resource management in the upper Teles Pires River basin in the
           Amazon-Cerrado ecotone in Brazil

    • Abstract: ABSTRACT The upper Teles Pires River basin is located in the Brazilian agriculture frontier in the north of Mato Grosso state and has experienced significant changes in land use and cover, which can cause major changes in its hydrological dynamics. Climatic and hydrologic data are scarce in the region, which poses uncertainties in the decision-making process aiming at the sustainable management of water resources in this strategic area. The aim of this study was to evaluate the performance of the Large-Scale Distributed Hydrological Model (MGB-IPH) to assess water availability of the upper Teles Pires basin and support water resource management in the Amazon-Cerrado ecotone. The MGB-IPH model was calibrated and validated using data from three streamflow stations available in the basin. In order to verify the model performance, the Nash-Sutcliffe (NS) and the PBIAS statistical parameters were applied. Our results show that, by using the MGB-IPH model with generally available data, the maximum and minimum flow regimes can be successfully assessed in the upper Teles Pires basin. The continuity curves of daily flow simulated by the model showed a good fit with the observed flow. Overall, the results demonstrated the applicability of the MGB-IPH model for water resource assessment and management in the basin.RESUMO A bacia do alto Rio Teles Pires está localizada na região de fronteira agrícola no norte de Mato Grosso, onde significativas mudanças no uso e cobertura do solo vem ocorrendo, o que, por sua vez, pode resultar em alterações importantes na dinâmica hidrológica da bacia. Dados climáticos e hidrológicos são escassos na bacia, o que gera dificuldades para a gestão sustentável dos recursos hídricos nesta região estratégica. No presente trabalho, avaliamos o desempenho do Modelo de Grandes Bacias (MGB-IPH) para a estimativa da disponibilidade hídrica da bacia do alto Teles Pires, visando o suporte à tomada de decisões para a gestão hídrica no ecótono Amazônia-Cerrado. O modelo MGB-IPH foi calibrado e validado utilizando séries históricas de três estações hidrométricas presentes na bacia. Para avaliação da qualidade do modelo, foram empregados os índices estatísticos de desempenho de Nash-Sutcliffe (NS) e a porcentagem BIAS (PBIAS). Com base nos resultados é possível afirmar que a utilização do modelo MGB-IPH possibilita a estimativa das vazões mínimas e máximas da bacia do alto Teles Pires de forma satisfatória. As curvas de continuidade das vazões diárias simuladas pelo modelo apresentaram um bom ajuste com os dados observados. Os resultados demonstram a aplicabilidade do modelo MGB-IPH como ferramenta de apoio à avaliação e gestão dos recursos hídricos na bacia.
       
  • Diversity of yeasts during fermentation of cocoa from two sites in the
           Brazilian Amazon

    • Abstract: ABSTRACT The purpose of this study was to identify the yeasts involved in spontaneous fermentation of cocoa from the Brazilian Amazon region. The fermentation process was carried out experimentally with cocoa seeds from two sites (Medicilândia and Tucumã), State of Pará, northern Brazil, during a six-day period. Totals of 44 yeasts were isolated from Medicilândia and 29 from Tucumã. Molecular identification was carried out by sequencing the D1/D2 region fragment of the rRNA 26S gene, expanded with universal primers for the NL1GC and LS2 eukaryotes. Pichia manshurica and Saccharomyces cerevisiae were identified in Medicilândia and five yeast species (Pichia fermentans, P. kudriavzevii, P. manshurica, S. cerevisiae and Zygosaccharomyces bailii) were identified in Tucumã. The results showed that P. manshurica and S. cerevisiae may have potential for use as starter cultures in future studies to improve the quality of cocoa seeds fermented in the Brazilian Amazon region.RESUMO A proposta deste estudo foi identificar as leveduras envolvidas na fermentação espontânea de cacau da Amazônia brasileira. A fermentação foi realizada em Medicilândia e Tucumã, Pará, Brasil, durante 6 dias. Em total foram obtidos 44 isolados de leveduras de Medicilândia e 29 de Tucumã. A identificação molecular foi realizada por sequenciamento do fragmento da região D1/D2 do gene rRNA 26S, amplificado com primers universais para eucariotos NL1GC e LS2. Em Medicilândia, foram identificadas Pichia manshurica e Saccharomyces cerevisiae. Em Tucumã foram identificadas cinco espécies (Pichia fermentans, P. kudriavzevii, P. manshurica, S. cerevisiae e Zygosaccharomyces bailii). Os resultados sugerem que P. manshurica e S. cerevisiae podem ter potencial para uso como culturas starter em estudos futuros, para melhorar a qualidade das sementes de cacau fermentadas na Amazônia brasileira.
       
  • First record of Aedes (Stegomyia) albopictus in the state of Amapá,
           northern Brazil

    • Abstract: ABSTRACT We report the first record of Aedes albopictus (Diptera: Culicidae) in the state of Amapá, northern Brazil. Two female specimens were collected from a Shannon trap in the locality of Ilha de Santana, municipality of Santana, Amapá. The occurrence of the species was confirmed with the installation of ten ovitraps. Aedes albopictus is a species of epidemiological importance for the transmission of arboviruses. Amapá was one of two Brazilian states without any record of this species.RESUMO Relatamos o primeiro registro de Aedes albopictus (Diptera: Culicidae) no Estado do Amapá, no norte do Brasil. Dois espécimes foram coletados em uma armadilha de Shannon na localidade de “Ilha de Santana”, município de Santana, no Amapá. O registro foi confirmado com a instalação de dez ovitrampas. Aedes albopictus é uma espécie com importância epidemiológica na transmissão de arboviroses. O Amapá era um de dois estados brasileiros sem registro dessa espécie.
       
  • Alternative vibro-dynamic compression processing of wood-cement composites
           using Amazonian wood

    • Abstract: ABSTRACT Wood-cement composite (WCC) is a potential construction material for tropical regions, due to its physico-mechanical properties and resistance to decay and fungi attack. However it is important to test alternative production methods and wood materials that are easier and cheaper than those traditionally used, in order to create a higher demand for this product. The aim of this work was to evaluate the use of wood from four Amazonian species (Eschweilera coriaceae, Swartzia recurva, Manilkara amazonica and Pouteria guianensis) in the production of wood-cement composites through a vibro-dynamic compression process, an alternative method to the use of a hydraulic press. The inhibition degree caused by the wood to the cement cure, measured by the factor CA, indicated that all species were compatible with Portland cement (CP II-Z). WCC with densities higher than 1,100 kg m-3 (produced with E. coriaceae and S. recurva particles) showed compressive strength values higher than 10 MPa, which fulfills the minimum requirement for lightweitgh reinforced concrete blocks for structural use.RESUMO Compósito madeira-cimento é um potencial material de construção para regiões tropicais, devido a suas propriedades físico-mecânicas e resistência ao ataque de fungos e podridão. Contudo, é importante testar métodos alternativos de produção e madeiras que sejam mais simples e baratos do que os tradicionalmente usados, para que se alcance uma maior demanda para esse produto. O objetivo deste estudo foi avaliar o uso de madeira de quatro espécies amazônicas (Eschweilera coriaceae, Swartzia recurva, Manilkara amazonica e Pouteria guianensis) na produção de compósitos de madeira-cimento (WCC) pelo processo de compactação vibro-dinâmica, um método alternativo que dispensa o uso de prensas hidráulicas. O grau de inibição à pega do cimento causado pela presença da madeira foi medido pelo fator CA e indicou que todas as quatro espécies foram compatíveis com o cimento Portland (CP II-Z). Compósitos com massa específica superior a 1.100 kg m-3 (produzidas com partículas de E. coriaceae e S. recurva) apresentaram valores de compressão axial acima de 10 MPa, requisito mínimo para classificar como blocos de concreto reforçados leves de uso estrutural.
       
 
 
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