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    1872 results match your criteria Anais da Academia Brasileira de Ciencias[Journal]

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    Landslides Zonation Hazard: relation between geological structures and landslides occurrence in hilly tropical regions of Brazil.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Instituto de Geociências e Ciências Exatas, Departamento de Geologia Aplicada, Avenida 24A, 1515, Bela Vista, 16506-900 Rio Claro, SP, Brazil.
    This paper presents a new approach of landslides zonation hazard studies, based on an integrated study of structural data along with geomorphological and external factors, in a hilly regions of Brazil, covered by a tropical humid rain-forest, called Serra do Mar. The Serra do Mar consists of a hilly region along the east coast of Brazil, with high slopes and many geological structures in a gneiss - migmatitic terrain. In contrast to traditional approaches, this method proposes that structural data (foliation, fractures and bedding planes) and its relation with the slope geometry, is important to be consider in the landslide zonation hazard, along with declivity, relative relief, soil and rock properties, land use and vegetation cover and hydrogeological and climate factors. Read More

    Biological Activity of Piper aduncum extracts on Anticarsia gemmatalis (Hübner) (Lepidoptera: Erebidae) and Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae).
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Instituto de Biotecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, 95070-560 Caxias do Sul, RS, Brazil.
    Piper aduncum found naturally in the Amazon and southeastern Brazil, is known for its secondary metabolites that have activity on insects. Anticarsia gemmatalis and Spodoptera frugiperda are among the major insect pests associated with agricultural production. This research evaluated the biological activity of hexane, ethyl acetate, and ethanol extracts of P. Read More

    New seminal variety of Stevia rebaudiana: Obtaining fractions with high antioxidant potential of leaves.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    State University of Maringa, Department of Biochemistry, Av. Colombo, 5790, Jardim Universitário, 87020-900 Maringá, PR, Brazil.
    The aim of this study was to determine the composition and antioxidant potential of leaves of a new variety of Stevia rebaudiana (Stevia UEM-13). Stevia leaves of UEM-13 contain rebaudioside A as the main glycoside, while most wild Stevia plants contain stevioside. Furthermore can be multiplied by seed, which reduces the cost of plant culture techniques as other clonal varieties are multiplied by buds, requiring sophisticated and expensive seedling production systems. Read More

    Remote sensing of the chlorophyll-a based on OLI/Landsat-8 and MSI/Sentinel-2A (Barra Bonita reservoir, Brazil).
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Department of Cartography, São Paulo State University, Rua Roberto Simonsen, 305, 19060-900 Presidente Prudente, SP, Brazil.
    In this present research, we assessed the performance of band algorithms in estimating chlorophyll-a (Chl-a) concentration based on bands of two new sensors: Operational Land Imager onboard Landsat-8 satellite (OLI/Landsat-8), and MultiSpectral Instrument onboard Sentinel-2A (MSI/Sentinel-2A). Band combinations designed for Thematic Mapper onboard Landsat-5 satellite (TM/Landsat-5) and MEdium Resolution Imaging Spectrometer onboard Envisat platform (MERIS/Envisat) were adapted for OLI/Landsat-8 and MSI/Sentinel-2A bands. Algorithms were calibrated using in situ measurements collected in three field campaigns carried out in different seasons. Read More

    Leaf area estimation from linear measurements in different ages of Crotalaria juncea plants.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Universidade Federal do Pampa, Campus Itaqui, Rua Luiz Joaquim de Sá Britto, s/n, Promorar, 97650-000 Itaqui, RS, Brazil.
    The goal of this study was to estimate the leaf area of Crotalaria juncea according to the linear dimensions of leaves from different ages. Two experiments were conducted with C. juncea cultivar IAC-KR1, in the 2014/2015 sowing seasons. Read More

    Preparation and characterization of alginate and gelatin microcapsules containing Lactobacillus rhamnosus.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Universidade Federal de Pernambuco, Centro Acadêmico de Vitória, Alto do Reservatório, s/n, Bela Vista, 55608-680 Vitória de Santo Antão, PE, Brazil.
    This paper describes the preparation and characterization of alginate beads coated with gelatin and containing Lactobacillus rhamnosus. Capsules were obtained by extrusion method using CaCl2 as cross linker. An experimental design was performed using alginate and gelatin concentrations as the variables investigated, while the response variable was the concentration of viable cells. Read More

    Oral insulin improves metabolic parameters in high fat diet fed rats.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Department of Medicine, State University of Ponta Grossa, Av. General Carlos Cavalcanti, 4748, Bairro Uvaranas, 84030-900 Ponta Grossa, PR, Brazil.
    Introduction/aim: The gut has shown to have a pivotal role on the pathophysiology of metabolic disease. Food stimulation of distal intestinal segments promotes enterohormones secretion influencing insulin metabolism. In diabetic rats, oral insulin has potential to change intestinal epithelium behavior. Read More

    Efficiency of essential oils of Ocimum basilicum and Cymbopogum flexuosus in the sedation and anaesthesia of Nile tilapia juveniles.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Instituto de Biologia, Universidade Federal da Bahia, Rua Barão de Geremoabo, 147, Campus Ondina, 40170-290 Salvador, BA, Brazil.
    This study aimed to verify the sedative and anaesthetic effect of the essential oils of basil (Ocimum basilicum) (EOOB) and lemongrass (Cymbopogum flexuosus) (EOCF) in Nile tilapia juveniles. The fish were transferred to aquaria containing different concentrations of each essential oil: 10, 25, 50, 100, 200, 400 and 600 μL L-1. The time of sedation ranged from 7 to 31 seconds and the recommended concentration was 10 or 25 μL L-1 for both essential oils. Read More

    A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the Upper Cretaceous of Shandong, China.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Key Laboratory of Vertebrate Evolution and Human Origins of the Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, PO Box 643, Beijing, 100044, China.
    A new saurolophine hadrosaurid, Laiyangosaurus youngi gen. et sp. nov. Read More

    Antifungal and antioxidant activity of fatty acid methyl esters from vegetable oils.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Campus Centro-Oeste Dona Lindu, Universidade Federal de São João Del Rei, Rua Sebastião Gonçalves Coelho, 400, Chanadour, 35501-296 Divinópolis, MG, Brazil.
    Fatty acid methyl esters (FAMEs) were obtained from vegetable oils of soybean, corn and sunflower. The current study was focused on evaluating the antifungal activity of FAMEs mainly against Paracoccidioides spp., as well as testing the interaction of these compounds with commercial antifungal drugs and also their antioxidant potential. Read More

    Agronomic viability of New Zealand spinach and kale intercropping.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Universidade Estadual Paulista 'Júlio de Mesquita Filho', Faculdade de Ciências Agrárias e Veterinárias, Departamento de Produção Vegetal, Câmpus Jaboticabal, Via de acesso Prof. Paulo Donato Castellane, s/n, 14884-900 Jaboticabal, SP, Brazil.
    The intercropping is a production system that aims to provide increased yield with less environmental impact, due to greater efficiency in the use of natural resources and inputs involved in the production process. An experiment was carried out to evaluate the agronomic viability of kale and New Zealand spinach intercropping as a function of the spinach transplanting time. (0, 14, 28, 42, 56, 70, 84 and 98 days after transplanting of the kale). Read More

    The influence of non-steroidal anti-inflammatory drugs and paracetamol used for pain control of orthodontic tooth movement: a systematic review.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Departamento de Odontologia, Universidade Federal de Sergipe, Avenida Governador Marcelo Déda, s/n, 49400-000 Lagarto, SE, Brazil.
    The present study aimed to perform a systematic literature review to determine if there is a non-steroidal anti-inflammatory drug (NSAID) that interferes less within tooth movement. This research was performed according to the PRISMA statement. Articles were searched in eight electronic databases (PubMed, Scopus, Embase, Web of Science, LILACS, SciELO, Google Scholar, and Open Grey). Read More

    The use of Proteinase K to access genitalia morphology, vouchering and DNA extraction in minute wasps.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Universidade Federal do Espírito Santo, Departamento de Ciências Biológicas, Av. Fernando Ferrari, 514, 29075-910 Vitória, ES, Brazil.
    Genitalia are rich source of characters in insect taxonomy. Usually, they are examined after dissection and cleaning with potassium hydroxide (KOH), procedure that may damage both genital morphological structures and intracellular molecular contents. Enzymatic procedure with Proteinase K has been used to clean muscle off the genitalia while extract DNA, but its damage to the genital structures has not been evaluated. Read More

    Brazilian science communication research: national and international contributions.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Visiting Scholar, Australian National Centre for the Public Awareness of Science, Australian National University, 56 Vasey Cres, Campbell, Act 2612, Australia.
    Science communication has emerged as a new field over the last 50 years, and its progress has been marked by a rise in jobs, training courses, research, associations, conferences and publications. This paper describes science communication internationally and the trends and challenges it faces, before looking at the national level. We have documented science communication activities in Brazil, the training courses, research, financial support and associations/societies. Read More

    Assessment of cow and farm level risk factors associated with Ureaplasma diversum in pasture-based dairy systems - A field study.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    College of Veterinary and Animal Sciences, Federal University of Goias, Campus Samambaia, Av. Esperança, s/n, Campus Universitario, 74690-900 Goiania, GO Brazil.
    Potential risk factors for Ureaplasma diversum in the vaginal mucus of 1,238 dairy cows were included in a multivariate logistic regression model, based on the cow level (i.e., granular vulvovaginitis [+GVV], yearly milk production [4500 kg or more], pregnancy, predominance of Bos taurus [+Bos Taurus], score of corporal condition [at least 2. Read More

    A possible relationship between gluconeogenesis and glycogen metabolism in rabbits during myocardial ischemia.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Laboratório de Clínica e Cirurgia Animal/CCTA and Unidade de Experimentação Animal, Universidade Estadual do Norte Fluminense Darcy Ribeiro/UENF, Av. Alberto Lamego, 2000, Parque Califórnia, 28013-602 Campos dos Goytacazes, RJ, Brazil.
    Ischemia is responsible for many metabolic abnormalities in the heart, causing changes in organ function. One of modifications occurring in the ischemic cell is changing from aerobic to anaerobic metabolism. This change causes the predominance of the use of carbohydrates as an energy substrate instead of lipids. Read More

    Carbon and nutrient stocks of three Fabaceae trees used for forest restoration and subjected to fertilization in Amazonia.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    National Institute for Research in Amazonia (INPA), Laboratory of Plant Physiology and Biochemistry, Ave. André Araújo, 2936, Aleixo, 69011-970 Manaus, AM, Brazil.
    Amazonia is crucial to global carbon cycle. Deforestation continues to be one of the main causes of the release of C into the atmosphere, but forest restoration plantations can reverse this scenario. However, there is still diffuse information about the C and nutrient stocks in the vegetation biomass. Read More

    Influence of substrate on the richness and composition of Neotropical cave fauna.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Laboratório de Estudos Subterrâneos, Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos, Rodovia Washington Luís, Km 235, Caixa Postal 676, 13565-905 São Carlos, SP, Brazil.
    The food base in the subterranean environment consists mainly of allochthonous materials. In this environment the resources are distributed generally in a heterogeneous dispersed way and the distribution of resources and their availability determine where the terrestrial invertebrates will reside, which is important for understanding ecological relationships and to establish conservation strategies. Thus, we tested how the complexity of substrates influences the richness and composition of the subterranean terrestrial invertebrates in the Presidente Olegário karst area, southeastern Brazil. Read More

    Correlations of condition factor and gonadosomatic, hepatosomatic and lipo-somatic relations of Leptodactylus macrosternum (ANURA: Leptodactylidae) in the Brazilian Semi-arid.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
    The objective of this study was to assess variations of the condition factor (K1) in relation to the gonadosomatic- RGS and energy reserves (hepatosomatic - RWL and liposomatic - RFB relations) of Leptodactylus macrosternum and their relationship to climate variation in the Northeast of Brazil, Caatinga area, state of Paraiba. The animals were captured fortnightly through active collecting, between January and December 2013. Significant differences were observed in the monthly variations of K1, RGS and RFB indices in male and female L. Read More

    Detection, purification and characterization of a lectin from freshwater green algae Spirogyra spp.
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Rua José Aurélio Câmara, s/n, Pici, 60440-970 Fortaleza, CE, Brazil.
    Freshwater algae are rich sources of structurally biologically active metabolites, such as fatty acids, steroids, carotenoids and polysaccharides. Among these metabolites, lectins stand out. Lectins are proteins or glycoproteins of non-immune origin which bind to carbohydrates or glycoconjugates, without changing ligand structure. Read More

    Assessment of the antiproliferative and antigenotoxic activity and phytochemical screening of aqueous extracts of Sambucus australis Cham. & Schltdl. (ADOXACEAE).
    An Acad Bras Cienc 2017 Aug 31. Epub 2017 Aug 31.
    Departamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil.
    The purpose of this study was to evaluate the antiproliferative and antigenotoxic activity of Sambucus australis Cham. & Schltdl. aqueous extracts on the cell cycle of Allium cepa L. Read More

    Animal models in biological and biomedical research - experimental and ethical concerns.
    An Acad Bras Cienc 2017 Sep 4. Epub 2017 Sep 4.
    Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo/USP, Rua do Matão, Travessa 14, 05508-090 São Paulo, SP, Brazil.
    Animal models have been used in experimental research to increase human knowledge and contribute to finding solutions to biological and biomedical questions. However, increased concern for the welfare of the animals used, and a growing awareness of the concept of animal rights, has brought a greater focus on the related ethical issues. In this review, we intend to give examples on how animals are used in the health research related to some major health problems in Brazil, as well as to stimulate discussion about the application of ethics in the use of animals in research and education, highlighting the role of National Council for the Control of Animal Experimentation (Conselho Nacional de Controle de Experimentação Animal - CONCEA) in these areas. Read More

    Phosphate solubilization by endophytic bacteria isolated from banana trees.
    An Acad Bras Cienc 2017 Sep 4. Epub 2017 Sep 4.
    Programa de Pós-Graduação em Produção Vegetal no Semiárido, Universidade Estadual de Montes Claros, Departamento de Ciências Agrárias, Campus de Janaúba, Av. Reinaldo Viana, 2630, 39400-000 Janaúba, MG, Brazil.
    Forty isolates of endophytic bacteria isolated from banana tree roots were assessed as to their capacity to solubilize phosphate in a solid culture medium supplemented with different inorganic and one organic source of phosphorus. The amount of phosphorus (P) in each liquid medium was quantified, and an indirect assessment of acid phosphatase activity was performed. All assays had a fully randomized design, with three repetitions. Read More

    Mercury content in the fur of jaguars (Panthera onca) from two areas under different levels of gold mining impact in the Brazilian Pantanal.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Laboratório de Ecologia de Paisagem e de Vertebrados, Programa de Pós-Graduação em Ciências Ambientais, Universidade do Extremo Sul Catarinense/UNESC, Av. Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil.
    The Pantanal is the largest inland wetland in the world and is under increasing anthropogenic threats, including long-term regionally intensive gold mining practices. Gold mining activities are known to cause the release of harmful pollutants such as mercury (Hg) to the surrounding environment. Jaguars (Panthera onca (Linnaeus, 1758)) are apex predators, and therefore show great potential to accumulate Hg by biomagnification. Read More

    Occurrence of arbuscular mycorrhizal fungi on King George Island, South Shetland Islands, Antarctica.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Programa de Pós-Graduação em Ciência do Solo, Universidade Federal de Lavras /UFLA, Departamento de Ciência do Solo, Caixa Postal 3037, 37200-000 Lavras, MG, Brazil.
    Arbuscular mycorrhizal fungi make up an important ecological niche in ecosystems, and knowledge of their diversity in extreme environments is still incipient. The objective of this work was to evaluate the density and diversity of arbuscular mycorrhizal fungi in the soil of King George Island in the South Shetland Islands archipelago, Antarctica. For that, soil and roots of Deschampsia antarctica were collected at the brazilian research station in Antarctica. Read More

    The quantification of testicular cells during the postnatal development in two Caviomorph rodents: the guinea pig (Cavia porcellus) and the cutia (Dasyprocta agouti).
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Departmento de Cirurgia, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo /FMVZ-USP, Av. Prof. Dr. Orlando Marques de Paiva, 87, Cidade Universitária, 05508-270 São Paulo, SP, Brazil.
    The germinative, Sertoli and Leydig cells of two caviomorph rodents (Cavia porcellus and Dasyprocta agouti) were counted as well as the estimation of the total volume of the testis and the total volume of seminiferous tubules and interstitium in prepubertal, pubertal and adult animals. The number of spermatogonia, spermatocytes and spermatids cells increased during the pubertal phase in both rodents, notably the spermatid cells. The spermatocyte and spermatid slightly decreased in the adult of both rodents, but the increment in spermatogonia cells number was seen, mainly in cutias. Read More

    Selection of alfalfa genotypes for resistance to the foliar pathogen Curvularia geniculata.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Deapartment of Forage Plants and Agrometeorology, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 7712, 91501-970 Porto Alegre, RS, Brazil.
    Foliar diseases impose severe restrictions on the persistence and productivity of Medicago sativa, both of which may be increased by developing disease resistant and more competitive genotypes that can improve pasture quality. We found Curvularia geniculata as the principal alfalfa foliar pathogen in the Brazilian state of Rio Grande do Sul (RS). Growth chamber experiments evaluated the resistance of alfalfa genotypes 'E1C4', 'CPPSul', 'ABT 805' and 'CUF-101' to C. Read More

    Is Forced Swimming Immobility a Good Endpoint for Modeling Negative Symptoms of Schizophrenia? - Study of Sub-Anesthetic Ketamine Repeated Administration Effects.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Laboratório de Psicofarmacologia Experimental, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Av. Ipiranga, 2752, 90610-000 Porto Alegre, RS, Brazil.
    Immobility time in the forced swimming has been described as analogous to emotional blunting or apathy and has been used for characterizing schizophrenia animal models. Several clinical studies support the use of NMDA receptor antagonists to model schizophrenia in rodents. Some works describe the effects of ketamine on immobility behavior but there is variability in the experimental design used leading to controversial results. Read More

    Palisadegrass effects on N fertilizer dynamic in intercropping systems with corn.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Escola Superior de Agricultura Luiz de Queiroz/ESALQ, Universidade de São Paulo/USP, Av. Pádua Dias, 11, 13418-900 Piracicaba, SP, Brazil.
    Corn grain yield, nitrogen (N) fertilizer efficiency and distribution to corn alone and three forms of corn and palisadegrass (Urochloa spp.) intercropping implantation was investigated. A field experiment with 15N labeling fertilizer was performed in randomized block design. Read More

    Development and evaluation of an inhalation chamber for in vivo tests.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Universidade Federal do Rio de Janeiro, Faculdade de Farmácia, Av. Carlos Chagas Filho, 373, Bloco A, 2º andar, sala 10, 21941-902 Rio de Janeiro, RJ, Brazil.
    The bioavailability, toxicity, and therapeutic efficacy of a drug is directly related to its administration route. The pulmonary route can be accessed by inhalation after fumigation, vaporization or nebulization. Thus, pharmacological and toxicological evaluation accessed by an apparatus specifically designed and validated for this type of administration is extremely important. Read More

    Sodium reduction in margarine using NaCl substitutes.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Departamento de Ciência dos Alimentos, Universidade Federal de Lavras, Caixa Postal 3037, 37200-000 Lavras, MG, Brazil.
    Sodium chloride is traditionally used as a food additive in food processing. However, because of its high sodium content, NaCl has been associated with chronic diseases. Margarine is a popular product that is used in several preparations, but it includes high sodium content; therefore, it is among the products whose sodium content should be reduced. Read More

    Spider species richness and sampling effort at Cracraft´S Belém Area of Endemism.
    An Acad Bras Cienc 2017 Aug 17. Epub 2017 Aug 17.
    Museu Paraense Emílio Goeldi, Coordenação de Zoologia, Avenida Perimetral, 1901, Caixa Postal 399, 66077-530 Belém, PA, Brazil.
    A list of spider species is presented for the Belém Area of Endemism, the most threatened region in the Amazon Basin, comprising portions of eastern State of Pará and western State of Maranhão, Brazil. The data are based both on records from the taxonomic and biodiversity survey literature and on scientific collection databases. A total of 319 identified species were recorded, with 318 occurring in Pará and only 22 in Maranhão. Read More

    Consequences of gestational diabetes to the brain and behavior of the offspring.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    School of Pharmacy, Carlos Chagas Filho Street, 373, Building A, Underground, Room 024, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, RJ, Brazil.
    Gestational diabetes mellitus (GD) is a form of insulin resistance triggered during the second/third trimesters of pregnancy in previously normoglycemic women. It is currently estimated that 10% of all pregnancies in the United States show this condition. For many years, the transient nature of GD has led researchers and physicians to assume that long-term consequences were absent. Read More

    Climatic characteristics of the 2010-2016 drought in the semiarid Northeast Brazil region.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    CEMADEN, Estrada Doutor Altino Bondesan, 500, Distrito de Eugênio de Melo, 12247-016 São José dos Campos, SP, Brazil.
    This study discusses the climatological aspects of the most severe drought ever recorded in the semiarid region Northeast Brazil. Droughts are recurrent in the region and while El Nino has driven some of these events others are more dependent on the tropical North Atlantic sea surface temperature fields. The drought affecting this region during the last 5 years shows an intensity and impact not seen in several decades in the regional economy and society. Read More

    First record of Scybalocanthon nigriceps (Harold, 1868) (Coleoptera: Scarabaeidae: Scarabaeinae) in Rio Grande do Sul state, southern Brazil.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Programa de Pós-Graduação em Ecologia, Conservação e Manejo da Vida Silvestre, Instituto de Biologia, Laboratório de Ecologia de Insetos, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos, 6627, Pampulha, 31270-910 Belo Horizonte, MG, Brazil.
    The dung beetle, Scybalocanthon nigriceps (Harold, 1868), is recorded in Rio Grande do Sul state, Brazil, for the first time, at the Moreno Fortes Biological Reserve, municipality of Dois Irmãos das Missões, northwest region of the state, expanding the area of occurrence and distribution of this species in the country. Read More

    A scientific survey on 1550 cases of oral lesions diagnosed in a Brazilian referral center.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Department of Dentistry, Federal University of Sergipe, Av. Governador Marcelo Déda Chagas, 13, São José, 49400-000 Lagarto, SE, Brazil.
    The present study aimed to perform an epidemiological survey on the prevalence rate of oral lesions diagnosed in a referral center in Brazil and to establish association between the lesions and the age and gender of the affected patients. This analytical observational study analyzed 3521 medical records of anatomopathological exams of the Pathological Anatomy and Cytopathology Laboratory of the Cancer Hospital of the state of Mato Grosso (Brazil), from December 2011 to September 2015. A total of 1550 relevant medical records was detected. Read More

    Poly(methylene blue)-modified electrode for indirect electrochemical sensing of OH radicals and radical scavengers.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Centro de Ciências Exatas e Tecnológicas, Centro Universitário UNIVATES, Avenida Avelino Talini, 171, 95914-014 Lajeado, RS, Brazil.
    A new modified electrode for indirect sensing of OH· and radical scavengers was described. The electrochemical polymerization of methylene blue in aqueous solutions and the properties of the resulting films on a glassy carbon electrode were carried out using cyclic voltammetry. A surface coverage of 1. Read More

    Nutrition facts and limits for micronutrients in tree species used in urban forestry.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Programa de Pós-Graduação em Engenharia Florestal, Universidade do Estado de Santa Catarina, Centro de Ciências Agroveterinárias, Av. Luiz de Camões, 2090, Conta Dinheiro, 88520-000 Lages, SC, Brazil.
    There is a huge lack of researches that evaluate the nutritional limits in tree species used in urban forestry, especially in terms of micronutrients. This study aimed to establish limits and range of micronutrients levels for the proper development of tree species utilized in urban forestry. The study was conducted in the city of Santa Maria-RS-Brazil. Read More

    Terpene Esters from Natural Products: Synthesis and Evaluation of Cytotoxic Activity.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Departamento de Fisiologia e Farmacologia, Universidade Federal do Ceará, Centro de Ciências da Saúde, Av. Coronel Nunes de Melo, 1127, Rodolfo Teófilo, 60430-270 Fortaleza, CE, Brazil.
    Natural steroids and triterpenes such as b-sitosterol, stigmasterol, lupeol, ursolic and betulinic acids were transformed into its hexanoic and oleic esters, to evaluate the influence of chemical modification towards the cytotoxic activities against tumor cells. The derivatives were evaluated against five tumor cell lines [OVCAR-8 (ovarian carcinoma); SF-295 (glioblastoma); HCT-116 (colon adenocarcinoma); HL-60 (leukemia); and PC-3 (prostate carcinoma)] and the results showed only betulinic acid hexyl ester exhibits cytotoxic potential activity. Read More

    Forage potential of native ecotypes of Paspalum notatum and P. guenoarum.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Programa de Pós-Graduação em Zootecnia, Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 7712, 91501-970 Porto Alegre, RS, Brazil.
    The Paspalum genus includes several species that are important for livestock in Rio Grande do Sul, such as P. notatum and P. guenoarum, typical of native pastures of the Pampa biome. Read More

    First Assessment of Carbon Stock in the Belowground Biomass of Brazilian Mangroves.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Universidade do Estado do Rio de Janeiro, Faculdade de Oceanografia, Departamento de Oceanografia Biológica, Núcleo de Estudos em Manguezais, Rua São Francisco Xavier, 524, 4023-E, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil.
    Studies on belowground roots biomass have increasingly reported the importance of the contribution of this compartment in carbon stock maintenance in mangrove forests. To date, there are no estimates of this contribution in Brazilian mangrove forests, although the country has the second largest area of mangroves worldwide. For this study, trenches dug in fringing forests in Guaratiba State Biological Reserve (Rio de Janeiro, Brazil) were used to evaluate the contribution of the different classes of roots and the vertical stratification of carbon stock. Read More

    Leaf area estimation of cassava from linear dimensions.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Universidade Estadual Paulista/UNESP, Faculdade de Ciências Agronômicas, Departamento de Produção e Melhoramento Vegetal, Rua José Barbosa de Barros, 1780, 18603-970 Botucatu, SP, Brazil.
    The objective of this study was to determine predictor models of leaf area of ​​cassava from linear leaf measurements. The experiment was carried out in greenhouse in the municipality of Botucatu, São Paulo state, Brazil. The stem cuttings with 5-7 nodes of the cultivar IAC 576-70 were planted in boxes filled with about 320 liters of soil, keeping soil moisture at field capacity, monitored by puncturing tensiometers. Read More

    Modeling and mapping basal area of Pinus taeda L. plantation using airborne LiDAR data.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Departamento de Engenharia Florestal, Universidade Federal do Paraná, Avenida Prefeito Lothário Meissner, 900, Jardim Botânico, 80210-170 Curitiba, PR, Brazil.
    Basal area (BA) is a good predictor of timber stand volume and forest growth. This study developed predictive models using field and airborne LiDAR (Light Detection and Ranging) data for estimation of basal area in Pinus taeda plantation in south Brazil. In the field, BA was collected from conventional forest inventory plots. Read More

    Avian Communities in the Amazonian Cangas Vegetation: Biogeographic Affinities, Components of Beta-Diversity and Conservation.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Departamento de Zoologia, Museu Paraense Emílio Goeldi, Av. Perimetral, 1901, 66077-530 Belém, PA, Brazil.
    The Amazonian cangas is a vegetation type distributed as patches of open vegetation embedded in a matrix of tropical forest and that grows over iron-rich soils in the Serra dos Carajás region. To characterize cangas avifauna, we surveyed birds in eight patches varying from 43 to 1,366 hectares. Cangas avifauna has compositional affinities with savannas widespread throughout the Amazon and other biomes, and we estimate that more than 200 bird species occurs in this habitat. Read More

    Cytotoxicity and bacterial membrane destabilization induced by Annona squamosa L. extracts.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Laboratório de Produtos Naturais Bioativos, Departamento de Bioquímica, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Rua José Lourenço Kelmer, s/n, São Pedro, 36036-900 Juiz de Fora, MG, Brazil.
    This study aimed to further investigate the cytotoxicity against tumor cell lines and several bacterial strains of Annona squamosa and its mode of action. Methanol extracts of A. squamosa leaves (ASL) and seeds (ASS) were used. Read More

    Evaluation of cell proliferation and endometrial thickness of bitches in different periods of diestrus.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Faculdade de Ciências Agrárias, Universidade do Oeste Paulista/UNOESTE, Campus II, Rod. Raposo Tavares, Km 572, Limoeiro, 19067-175 Presidente Prudente, SP, Brazil.
    This study aimed to determine the histological features of the endometrium of bitches, as well as the cell proliferation at specific moments of diestrus, 10, 20, 30, 40, 50 and 60 days post ovulation, correlating the endometrial thickness with the uterine cell proliferation and the metabolic state (weight, blood glucose and plasma cholesterol) of the animals. Therefore, the right and left uterine horns of 26 clinically healthy bitches submitted to ovariohysterectomy were histologically analyzed 10, 20, 30, 40, 50 and 60 days post ovulation. The hematoxylin-eosin and AgNOR staining techniques were performed. Read More

    Fatty acid profile in vertical strata of elephant grass subjected to intermittent stocking.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Departamento de Produção Animal e Alimentos, Universidade do Estado de Santa Catarina/UDESC, Av. Camões, 2090, 88520-000 Lages, SC, Brazil.
    The milk and meat from animals with a pasture-based diet have higher proportions of CLA and C18:3 and lower omega-6:omega-3 ratios than products from animals with diets based on corn silage and concentrate. However, most of the published studies have evaluated fatty acid profiles in temperate climate grasses and the literature with tropical grasses is scarce. Thus, the aim of this study was to evaluate the morphological and fatty acid compositions in the vertical strata of elephant grass (Pennisetum purpureum Schum. Read More

    Where is sugarcane cropping expanding in the brazilian cerrado, and why? A case study.
    An Acad Bras Cienc 2017 Aug 14. Epub 2017 Aug 14.
    Plant Production Systems, Wageningen University, P.O. Box 430, 6700AK Wageningen, The Netherlands.
    Sugarcane growing area in Brazil sharply expanded between 2000 and 2010 due to the increasing world demand for sugar and ethanol. Since this expansion of sugarcane is said to occur in areas covered by degraded pastures, it is likely not threatening the environment or food production. In order to verify this assumption, we investigate at farm and field levels which types of land use sugarcane cropping replaced between 2005 and 2010 and the reasons for farmers shifting or not shifting to sugarcane, as a case study in two counties in the state of Goiás. Read More

    Assessment of the occurrence and richness of arbuscular mycorrhizal fungal spores by direct analysis of field samples and trap culture - a comparative study.
    An Acad Bras Cienc 2017 Aug 7. Epub 2017 Aug 7.
    Departamento de Ciência do Solo, Universidade Federal de Lavras, Av. Doutor Sylvio Menicucci, 1001, Bairro Kennedy, 37200-000 Lavras, MG, Brazil.
    In this work, we hypothesized that two spore-based methods, direct analysis of field samples and trap cultures, simultaneously used for assessment of occurrence and species richness of arbuscular mycorrhizal fungi (AMF) may vary in their efficiency according to the environmental conditions and the total AMF species richness of the evaluated ecosystem. The performance of both methods was analyzed based on two datasets: 1) a complete site x species matrix compiled from two studies in different land uses in the Amazon using direct analysis of field samples and trap cultures. 2) Total number of AMF morphotypes detected by both methods in published manuscripts across several ecosystems. Read More

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