3,458 results match your criteria Anais Da Academia Brasileira De Ciencias[Journal]

The Annals of the Brazilian Academy of Sciences.

An Acad Bras Cienc 2022 May 6;94(1):e20220372. Epub 2022 May 6.

Universidade Federal do Rio de Janeiro, Museu Nacional, Laboratório de Sistemática e Tafonomia de Vertebrados Fósseis, Departamento de Geologia e Paleontologia, Quinta da Boa Vista, s/n, São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil.

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Different land use types influence Red-browed Amazon (Amazona rhodocorytha) ccurrence in Southeastern Brazil.

An Acad Bras Cienc 2022 6;94(1):e20191227. Epub 2022 May 6.

Universidade Federal do Paraná, Departamento de Zoologia, Setor de Ciências Biológicas, Av. Cel. Francisco H. dos Santos, 100, 81531-970 Curitiba, PR, Brazil.

The habitat loss is the main threat for many parrot species worldwide. However, the disturbed environments can influence the occurrence of the species positively or negatively, depending on its structure and potential use as an alternative environment. Therefore, this work aims to determine the relationship between land use types and the occurrence of the threatened Red-browed Amazon, identifying the land use types related to species' occurrence and the direction of these relationships. Read More

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Synergistic combination of duloxetine hydrochloride and fluconazole reduces the cell growth and capsule size of Cryptococcus neoformans.

An Acad Bras Cienc 2022 9;94(2):e20211021. Epub 2022 May 9.

Universidade Estadual Paulista (UNESP), Instituto de Ciência e Tecnologia, Departamento de Biociências e Diagnóstico Oral, Av. Engenheiro Francisco José Longo, 777, 12245-000 São José dos Campos, SP, Brazil.

This study aimed to evaluate the effect of duloxetine hydrochloride (DH) on Cryptococcus neoformans. DH minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) were 18.5 µg/mL, and the combination with fluconazole (FLZ) reduced the MIC value by 16-and 4-fold for DH and FLZ, respectively. Read More

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Molecular data reveal multiple lineages of Scinax nebulosus (Spix, 1824) (Anura: Hylidae) with Plio-Pleistocene diversification in different Brazilian regions.

An Acad Bras Cienc 2022 9;94(2):e20200733. Epub 2022 May 9.

Programa de Pós-Graduação Bionorte, Universidade Federal do Sul da Bahia (UFSB), Instituto Sosígenes Costa de Humanidades, Artes e Ciências, Centro de Formação em Ciências Ambientais, Departamento de Ciências Biológicas, Grupo Biodiversidade da Fauna do Sul da Bahia, Laboratório de Zoologia, Rod. Porto Seguro, BR 367, Km 10, Eunápolis, 45810-000 Porto Seguro, BA, Brazil.

To understand the organism's history, we can start assessing the complexity of the biome where they occur. In this study, we used a region of the mitochondrial genome, the rRNA 16S, to evaluate the genetic differentiation in Scinax nebulosus along with its geographical range highlighting important Brazilian biomes as Restinga, Cerrado, Amazon, and Atlantic Forest. Geographically structured genetic divergence was observed within the species S. Read More

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Current extraction methods and potential use of essential oils for quality and safety assurance of foods.

An Acad Bras Cienc 2022 9;94(2):e20191270. Epub 2022 May 9.

Universidade Estadual de Maringá/UEM, Departamento de Engenharia de Alimentos, Av. Colombo nº 5.790, 87020-900 Maringá, PR, Brazil.

Essential oils (EOs) or vegetable oils have become the focus of several studies because of their interesting bioactive properties. Their application has been successfully explored in active packaging, edible coatings, and as natural flavoring to extend the shelf life of various types of food products. In addition, alternative methods of extraction of EOs (ultrasound-assisted extraction, microwave-assisted extraction, pressurized liquid extraction and supercritical fluid extraction) have been shown to be more attractive than traditional methods since they present better efficiency, shorter extraction times and do not use toxic solvents. Read More

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Hepatotoxicity and Mutagenicity assessment during chronic in vivo exposure to aqueous extracts from Peperomia pellucida.

An Acad Bras Cienc 2022 9;94(2):e20191255. Epub 2022 May 9.

Department of Chemistry, College of Science, De La Salle University, 2401 Taft Avenue, Manila 0922 Philippines.

Studies on herbal medicine have exposed some toxic effects on humans. Peperomia pellucida (L.) HBK (P. Read More

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Melon genotypes with resistance to Liriomyza sativae Blanchard (Diptera: Agromyzidae).

An Acad Bras Cienc 2022 9;94(2):e20191244. Epub 2022 May 9.

Centro Nacional de Pesquisa de Agroindústria Tropical, Embrapa Agroindústria Tropical, Rua Doutora Sara Mesquita, 2270, Pici, 60511-110 Fortaleza, CE, Brazil.

The vegetable leaf miner (Liriomyza sativae) is considered one of the main melon pests, causing serious problems for producers in all growing regions. A promising type of pest control has been use of resistant cultivars, in isolation or associated with other types of control. This study aimed to evaluate the resistance of melon genotypes to L. Read More

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Chemical composition and in situ degradability of sugarcane tip hay subjected to alkaline treatment.

An Acad Bras Cienc 2022 9;94(2):e20190996. Epub 2022 May 9.

Instituto Federal do Piauí, Campus Paulistana, Rodovia BR 407, Km 5, s/n, Lagoa dos Canudos, 64750-000 Paulistana, PI, Brazil.

The present study aimed to evaluate the effect of alkaline treatments with urea, NaOH and Ca(OH)2 on chemical composition and in situ ruminal degradability of dry matter, crud protein and neutral detergent fiber of sugarcane tip hay. Samples were incubated in the rumen of three cannulated cattle for up to 72 hours in a split plot randomized block design. Ammoniation with 6% urea increased (p<0. Read More

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The marine carbonate system along the northern Antarctic Peninsula: current knowledge and future perspectives.

An Acad Bras Cienc 2022 9;94(suppl 1):e20210825. Epub 2022 May 9.

Universidade Federal do Rio Grande, Instituto de Oceanografia, Laboratório de Estudos dos Oceanos e Clima (LEOC), Av. Itália, s/n, 96203-900 Rio Grande, RS, Brazil.

Among the regions of the Southern Ocean, the northern Antarctic Peninsula (NAP) has emerged as a hotspot of climate change investigation. Nonetheless, studies have indicated issues and knowledge gaps that must be addressed to expand the understanding of the carbonate system in the region. Therefore, we focused on identifying current knowledge about sea-air CO2 fluxes (FCO2), anthropogenic carbon (Cant) and ocean acidification along NAP and provide a better comprehension of the key physical processes controlling the carbonate system. Read More

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An inventory of glacial lakes in the South Shetland Islands (Antarctica): temporal variation and environmental patterns.

An Acad Bras Cienc 2022 4;94(suppl 1):e20210683. Epub 2022 May 4.

Universidade Federal do Rio Grande do Sul, Centro Polar e Climático, Avenida Bento Gonçalves, 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil.

Monitoring and inventorying proglacial lakes in the Maritime Antarctica region is essential for understanding the effects of climate change on these environments. This study uses Landsat images to create a map of lakes in ice-free areas of the South Shetlands Islands (SSI) for 1986/89, 2000/03 and 2020, and verification of patterns of change in lake areas and numbers. Normalized water difference index (NDWI) products, image segmentation, field records, and cartographic products from other studies were used to validate the results. Read More

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Antarctic biological soil crusts surface reflectance patterns from landsat and sentinel-2 images.

An Acad Bras Cienc 2022 9;94(suppl 1):e20210596. Epub 2022 May 9.

Universidade Federal do Rio Grande do Sul, Centro Polar e Climático, Departament of Geography, Av. Bento Gonçalves, 9500, 91501-970 Porto Alegre, RS, Brazil.

The remote sensing techniques must be used to obtain long-term information in remote areas, like the Antarctic continent, to monitor the environmental productivity and its changes. The aim of this work was to analyze the surface reflectance profile patterns for the Antarctic biological soil crusts (algae, lichens, and mosses) in an area of Nelson Island (South Shetland Islands, maritime Antarctic), calculated from Landsat and Sentinel-2 images to identify its similarities and differences due to targets, sensors and acquired date. The surface reflectance values for Antarctic biological soil crusts are similar for those observed for biological soil crusts in other Earth extreme environments, like deserts. Read More

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Relative contributions of fossil fuel and biomass burning sources to black carbon aerosol on the Southern Atlantic Ocean Coast and King George Island (Antarctic Peninsula).

An Acad Bras Cienc 2022 29;94(suppl 1):e20210805. Epub 2022 Apr 29.

Universidade Federal do Paraná, Departamento de Engenharia Ambiental, Centro Politécnico, Setor de Tecnologia/Edifício de Admnistração, 3° andar, Rua Francisco H. dos Santos, 210, Jardim das Américas, 81531-980 Curitiba, PR, Brazil.

Carbonaceous aerosols can affect climate, especially particles containing black carbon (BC). BC originated from the incomplete combustion of fossil fuel and biomass, which can heat the atmosphere and increase ice melting, but little is known about BC sources to Antarctica. We quantified the contribution of distant origin (biomass burning) and local emissions (fossil fuel) to atmospheric BC concentration in the King George Island (Antarctic Peninsula) and the Southern Ocean. Read More

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Increase in the number of explosive low‒level cyclones around King George Island in the last three decades.

An Acad Bras Cienc 2022 29;94(suppl 1):e20210633. Epub 2022 Apr 29.

Coordenação Geral de Ciências da Terra,Instituto Nacional de Pesquisas Espaciais/ INPE, Av. dos Astronautas, 1758, 12227-010 São José dos Campos, SP, Brazil.

This paper documents an increase in the number of observed explosive cyclones (EC) at King George Island, South Shetland Islands, Antarctica, over the 1989‒2020 period. In ECs at 60o latitudes the surface atmospheric pressure drops ≥24 hPA in 24 hours. The annual EC frequency time series shows a significant positive trend of ~2. Read More

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Polycyclic Aromatic Hydrocarbons in Antarctic Ice Core: Prior Study by Homogeneous Liquid-Liquid Extraction and High-Performance Liquid Chromatography.

An Acad Bras Cienc 2022 29;94(suppl 1):e20210628. Epub 2022 Apr 29.

Laboratorio de Educación, Centro de Modelamiento Matemático, Beauchef 851, Postal Code 8370285, Santiago, Región Metropolitana, Chile.

Organic contamination has been less investigated in Antarctic snow and ice than in other matrices due to analytical operational problems. In this study, the concentration of 14 Polycyclic Aromatic Hydrocarbons was determined in a shallow firn core by Homogeneous Liquid-Liquid Extraction and High-Performance Liquid Chromatography with a Fluorescence Detector. This investigation aimed to develop a simple analytical methodology for future application directly in fieldwork, taking advantage of the simplicity and small sample volumes. Read More

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Taxonomic and functional diversity from Antarctic ice-tephra microbial community: ecological insights and potential for bioprospection.

An Acad Bras Cienc 2022 29;94(suppl 1):e20210621. Epub 2022 Apr 29.

Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Departamento de Microbiologia, Imunologia e Parasitologia, Rua da Prefeitura Universitária, s/n, Setor F, Bloco F, Sala F710, 88040-900 Florianópolis, SC, Brazil.

Antarctic active volcanoes can disperse pyroclastic minerals at long distances, transporting nutrients and microorganisms to the surrounding glacial environment. The sedimented volcanic materials - called tephras - may interact with glacier ice and produce a unique environment for microbial life. This study aimed to describe the microbial community structure of an Antarctic glacier ice with tephra layers in terms of its taxonomic and functional diversity. Read More

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Highlights of ionospheric investigations at Comandante Ferraz Brazilian Antarctic Station.

An Acad Bras Cienc 2022 29;94(suppl 1):e20210600. Epub 2022 Apr 29.

Universidade Presbiteriana Mackenzie, Centro de Rádio Astronomia e Astrofísica Mackenzie, Rua da Consolação, 930, 01302-907 São Paulo, SP, Brazil.

The ionospheric investigations have improved our understanding of the space weather role in the upper atmosphere conditions, particularly at higher latitudes where the geospace phenomena print their signatures. The simultaneous observations using multi-instruments have improved our knowledge of the coupling processes inside the ionosphere, and their connection with the magnetosphere and neutral atmosphere processes under the space weather phenomena. The ionosphere probing at EACF started on 1986 using an analogical very low frequency (VLF) system, and after the year 2004 using digital VLF system, global navigation satellite system (GNSS), riometers and Canadian digital ionosonde (CADI). Read More

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Blood biochemistry and antioxidant status altered by anthropogenic impact in Adélie penguins (Pygoscelis adeliae).

An Acad Bras Cienc 2022 29;94(suppl 1):e20210579. Epub 2022 Apr 29.

Laboratorio de Ecofisiología y Ecotoxicología, Instituto Antártico Argentino, 25 de Mayo 1143, B1650HMK San Martín, Buenos Aires, Argentina.

Human activities are increased in Antarctica during decades, primarily due to the logistic and tourism operations, which consequent negative impact on penguin populations, altering their physiological responses. Therefore, we aimed to assess the blood biochemistry and oxidant/antioxidant balance of Adélie penguins (Pygoscelis adeliae) inhabiting two selected colonies: Potter Peninsula, considered as a low impacted colony, and Esperanza/Hope Bay as a high impacted colony. The levels of calcium, uric acid, and fructosamine, showed significant high values (p<0. Read More

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Geophysical investigation in sediment cores and its relationship with the governing sedimentary processes at Bransfield Basin, Antarctica.

An Acad Bras Cienc 2022 29;94(suppl 1):e20210551. Epub 2022 Apr 29.

Programa de Pós-Graduação em Dinâmica dos Oceanos e da Terra, Universidade Federal Fluminense (DOT-UFF), Instituto de Geociências, Av. Gal. Milton Tavares de Souza, s/n, Campus da Praia Vermelha, Boa Viagem, 24210-346 Niterói, RJ, Brazil.

This research aims to investigate sediment cores from a glaciomarine environment based on their petrophysical parameters to elucidate lithological and sedimentary issues, as well as to identify a geophysical signature based on their parameter's response. To achieve this objective, six marine sediment cores were collected in the Central Bransfield Basin - Antarctica, the lengths ranging from 1.5 to 5. Read More

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Pellets of Stercorarius spp. (skua) as plant dispersers in the Antarctic Peninsula.

An Acad Bras Cienc 2022 29;94(suppl 1):e20210436. Epub 2022 Apr 29.

Programa de Pós-Graduação em Ciências Biológicas, Universidade Federal do Pampa, Laboratório de Taxonomia de Fungos, Av. Antonio Trilha, 1847, Centro, 97300-162 São Gabriel, RS, Brazil.

The Antarctic Peninsula has experienced some of the most accelerated warming worldwide, resulting in the retreat of glaciers and creation of new areas for plant development. Information regarding the plant dispersal processes to these new niches is scarce in Antarctica, despite birds being important vectors elsewhere. Many bird pellets (with feed remains such as bones and feathers) are generated annually in Antarctica, which are light and easily transported by the wind and include vegetation that is accidentally or purposely swallowed. Read More

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Anthropogenic trace elements (Bi, Cd, Cr, Pb) concentrations in a West Antarctic ice core.

An Acad Bras Cienc 2022 29;94(suppl 1):e20210351. Epub 2022 Apr 29.

Universidade Federal do Rio Grande do Sul/UFRGS, Instituto de Geociências, Centro Polar e Climático, Av. Bento Gonçalves, 9500, 90650-001 Porto Alegre, RS, Brazil.

Trace elements are emitted to the atmosphere from natural and anthropogenic sources. The increase in industrialization and mining occurring from the late 19th century released large quantities of toxic trace elements into the Earth's atmosphere. Here we investigate the variability of concentrations of bismuth, cadmium, chromium, and lead in two Mount Johns - MJ (79°55'28"S, 94°23'18"W, 2100 m a. Read More

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Does being infected with SARS-CoV-2 in the first-trimester increase the risk of miscarriage?

An Acad Bras Cienc 2022 2;94(2):e20211283. Epub 2022 May 2.

Erzincan Binali Yildirim University, Medical Faculty, Obstetrics and Gynaecology Department, Basbaglar District, Haci Ali Akin Street, 32, 24100, Center, Erzincan, Turkey.

Aim of this study is to investigate whether the risk of miscarriage increases in pregnant women who had COVID-19 in first trimester. Our study included 52 patients with SARS-CoV-2 infection detected by RT-PCR and 53 patients with negative RT-PCR test in samples taken with nasopharyngeal swab in the first trimester between March 1 and December 31, 2020. Complete abortion, incomplete abortion, blighted ovum, intrauterine exitus, biochemical pregnancies were accepted as in the miscarriage group (MG). Read More

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Fatty acid synthase as a potential new therapeutic target for cervical cancer.

An Acad Bras Cienc 2022 2;94(2):e20210670. Epub 2022 May 2.

Universidade Federal do Rio Grande do Sul, Faculdade de Farmácia, Av. Ipiranga, 2752, 90610-000 Porto Alegre, RS, Brazil.

Fatty acid synthase (FASN) is the rate-limiting enzyme for the de novo synthesis of fatty acids in the cytoplasm of tumour cells. Many tumour cells express high levels of FASN, and its expression is associated with a poorer prognosis. Cervical cancer is a major public health problem, representing the fourth most common cancer affecting women worldwide. Read More

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Feeding ecology of endemic frogs of the Atlantic Forest in southern Brazil.

An Acad Bras Cienc 2022 2;94(2):e20210282. Epub 2022 May 2.

Universidade Tecnológica Federal do Paraná - UTFPR, Linha Santa Bárbara, s/n, 85601-970 Francisco Beltrão, PR, Brazil.

Our objective was to describe and compare the diet of endemic anurans of the Atlantic Forest, as well as to evaluate the influence of biotic factors on the trophic ecology of the species. We conducted the study in Mananciais da Serra (Piraquara-PR), a transition region between mixed and dense ombrophilous forest, between January 2019 and February 2020. In this work, we describe the diet of eight species: Aplastodiscus albosignatus, Boana semiguttata, Bokermannohyla circumdata, Ischnocnema henselii, Leptodactylus notoaktites, Proceratophrys boiei, Rhinella abei and Scythrophrys sawayae. Read More

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Analysis of the number of deaths in Brazil between 2003 and 2020 and possible inferences about the COVID-19 pandemic and history of other diseases.

An Acad Bras Cienc 2022 2;94(2):e20210205. Epub 2022 May 2.

Universidade do Estado do Rio de Janeiro, Instituto de Física, Rua São Francisco Xavier, 524, Maracanã, 20550-900 Rio de Janeiro, RJ, Brazil.

The historical number of yearly deaths in Brazil has a growing tendency since always. In recent years were observed increases in this number beyond the tendency, probably associated to epidemics. In this work it was implemented an analysis on public data, using the total number of deaths from violence, respiratory diseases, and deaths in hospitals. Read More

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Diagnostic Value of Serum Cytokines in Predicting a Complicated Acute Appendicitis.

An Acad Bras Cienc 2022 2;94(2):e20201947. Epub 2022 May 2.

Bakirkoy Dr. Sadi Konuk Training and Research Hospital, Department of General Surgery, Zuhuratbaba Neighborhood, Tevfik Saglam Road, Number 11, 34147, Bakirkoy, Istanbul, Turkey.

The diagnostic role of serum cytokines depends on the etiology and pathogenesis of acute appendicitis but the clinical significance of these cytokines in the differential diagnosis of complicated acute appendicitis remains unclear. To investigate the prediction of progression and diagnostic values of interleukin-6, interleukin-1 beta, and tumor necrosis factor-alpha in complicated acute appendicitis. This study was conducted in 100 patients with a definitive diagnosis of acute appendicitis and 20 individuals assigned for the control group. Read More

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Plasma antioxidant capacity in cervical cancer patients.

An Acad Bras Cienc 2022 2;94(2):e20201733. Epub 2022 May 2.

Universidade Federal do Maranhão, Curso de Medicina, Laboratório de Fisiopatologia e Investigação Terapêutica, Av. da Universidade, s/n, Dom Afonso Felipe Gregory, 65915-240 Imperatriz, MA, Brazil.

The oxidative pathway and the alteration of the antioxidant defense have drawn attention to the pathophysiology of cervical cancer (CC). In our preliminary study, it was possible to corroborate the findings regarding the antioxidants of patients affected by CC. The total antioxidant activity and lipid peroxidation (LP) were evaluated in 14 people diagnosed with CC and 14 volunteers without CC (control group). Read More

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Studies on aquatic fungi in Dikarya: a review of the literature from Southern Cone of South America.

An Acad Bras Cienc 2022 2;94(2):e20201210. Epub 2022 May 2.

UNLP-CONICET (CCT La Plata), Instituto de Limnología "Dr. Raúl Ringuelet", Bv. 120 y 62, n°1437, 1900 La Plata, Buenos Aires, Argentina.

A bibliographic analysis was carried out to update the state of knowledge about aquatic fungi belonging to the subkingdom Dikarya in the Southern Cone of South America. The exhaustive search resulted in 38 articles reported. These papers correspond to those on taxonomic, ecological and biogeographic topics and include studies from lotic environments of the temperate ecoregions of Chile and Argentina. Read More

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"I am a scientist, but nobody needs to know": towards an understanding about professional self-designation among university professors in Brazil.

An Acad Bras Cienc 2022 2;94(2):e20200763. Epub 2022 May 2.

Universidade Federal de Minas Gerais, Núcleo de Educação e Comunicação em Ciências da Vida e da Saúde - Neducom, Departamento de Genética, Ecologia e Evolução, Instituto de Ciências Biológicas, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil.

As in many countries, in Brazil science is conducted mostly inside universities by professors and their graduate students and post-docs. This article aims at assessing the circumstances under which university professors of a biological sciences institute of a public university are willing to adopt the term 'scientist' as a form of self-designation. Using an online questionnaire (n=21) and two focus groups (n=12) we investigated how these professionals call or describe themselves under different situations and for distinct publics. Read More

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Protective effect by low-intensity downhill running training against muscle damage and oxidative stress after high-intensity downhill running in rats.

An Acad Bras Cienc 2022 2;94(2):e20200265. Epub 2022 May 2.

Selçuk University, Division of Sports Physiology, Department of Physiology, Faculty of Medicine, Selçuklu, 42131, Konya, Turkey.

This study examined the effects of low-intensity eccentric exercise training performed before high-intensity eccentric exercise on muscle damage markers, oxidative stress and antioxidant defense. Twenty-two rats were divided into 3 groups; control (CON; n = 6), high-intensity eccentric exercise (HE; n = 8) and low-intensity eccentric exercise training plus high-intensity eccentric exercise (LET + HE; n = 8). Rats in the HE group performed HE at once. Read More

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Effects of lysine levels on performance, blood parameters, and nutrient digestibility of Duroc barrows in the starter phase.

An Acad Bras Cienc 2022 2;94(2):e20190516. Epub 2022 May 2.

Universidade Federal Rural de Pernambuco, Rua Manoel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.

The objective of this study was to evaluate the effects of different levels of digestible lysine, at fixed amino acid ratios, in performance, blood parameters and diet digestibility of barrows from 15 to 30 kg. Fifty barrows of the Duroc breed with an average initial body weight of 14.95±3. Read More

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