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Anais da Academia Brasileira de Ciências

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https://www.readbyqxmd.com/read/28273246/distributional-patterns-of-aptian-albian-paleoichthyofauna-of-brazil-and-africa-based-on-track-analysis
#1
Thaís C C Parméra, Valéria Gallo, Hilda M A DA Silva, Francisco J DE Figueiredo
The Aptian-Albian paleoichthyofauna in Brazil and Africa is quite diverse, yet their geographic patterns still require accounts. This work consists of a panbiogeographical analysis of paleoichthyofauna from Aptian-Albian through track analysis. Geographic coordinates were obtained and converted into paleocoordinates. Individual Tracks (ITs) and Generalized Tracks (GTs) were built with the aid of ArcView GIS v3.2 program using Trazos2004 extension. As a result, four GTs and tree Biogeographic Nodes (A, B and C) had been identified...
March 2, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28177052/reassessment-and-relationships-of-%C3%A2-scutatuspinosus-itapagipensis-teleostei-clupeomorpha-%C3%A2-ellimmichthyiformes-from-the-neocomian-of-rec%C3%A3-ncavo-basin-northeastern-brazil
#2
Francisco J DE Figueiredo, Douglas R M Ribeiro
Clupeomorphs are found in many assemblages of the northeastern Brazil, whose ages range from the Neocomian to Paleogene. Ten species were described. Among them †Scutatuspinosus itapagipensis, a torpedo-like fish found in shales of the Marfim Formation from Bahia, remains poorly known. At first it was positioned within †Scutatuspinosinae and indicated as closely related to †Diplomystus. Diagnoses for the subfamily and genus were based on certain characters masking relationships. Recently it was placed in †Ellimmichthyiformes, but its systematic position remains controversial...
February 6, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423086/evaluation-of-cytogenotoxicity-antioxidant-and-hypoglycemiant-activities-of-isolate-compounds-from-mansoa-hirsuta-d-c-bignoniaceae
#3
Joquebede R Pereira, Raphael F Queiroz, Erlânia A DE Siqueira, Ana Christina Brasileiro-Vidal, Antônio E G Sant'ana, Daniel M Silva, Paulo R A DE Mello Affonso
Mansoa hirsuta (Bignoniaceae) is a native plant from caatinga in Brazilian semiarid. This plant has been locally used as antimicrobial and hypoglycemiant agents, but their action mechanisms and toxicity remain largely unknown. Therefore, we evaluated the composition and antioxidant, cytoprotective and hypoglycemiant effects of raw extract, fractions and compounds from leaves of M. hirsuta. The cytogenotoxic effects of ursolic and oleanolic acids, the main phytotherapic components of this plant, were assessed...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423085/molecular-survey-of-anaplasma-platys-and-ehrlichia-canis-in-dogs-from-campo-grande-mato-grosso-do-sul-brazil
#4
Rodrigo Soares, Carlos Alberto Ramos, Thatianna Pedroso, Verônica Babo-Terra, Herbert Cleveland, Flábio DE Araújo
This study investigated the frequency of infection by Anaplasma platys and Ehrlichia canis in dogs submitted to animal health centers in Campo Grande, state of Mato Grosso do Sul, Brazil. E. canis and A. platys showed infection frequencies of 55.75% and 16.96%, respectively. The identity of the two species was confirmed by DNA sequencing.
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423084/immune-system-dysfunction-in-the-elderly
#5
Eduardo Fuentes, Manuel Fuentes, Marcelo Alarcón, Iván Palomo
Human aging is characterized by both physical and physiological frailty that profoundly affects the immune system. In this context aging is associated with declines in adaptive and innate immunity established as immunosenescence. Immunosenescence is a new concept that reflects the age-associated restructuring changes of innate and adaptive immune functions. Thus elderly individuals usually present chronic low-level inflammation, higher infection rates and chronic diseases. A study of alterations in the immune system during aging could provide a potentially useful biomarker for the evaluation of immune senescence treatment...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423083/autophagy-protects-against-neural-cell-death-induced-by-piperidine-alkaloids-present-in-prosopis-juliflora-mesquite
#6
Victor D A Silva, Carlos Cuevas, Patricia Muñoz, Monica Villa, Ulises Ahumada-Castro, Sandro Huenchuguala, Cleonice C Dos Santos, Fillipe M DE Araujo, Rafael S Ferreira, Vanessa B DA Silva, Juliana H C E Silva, Érica N Soares, Eudes S Velozo, Juan Segura-Aguilar, Silvia L Costa
Prosopis juliflora is a shrub that has been used to feed animals and humans. However, a synergistic action of piperidine alkaloids has been suggested to be responsible for neurotoxic damage observed in animals. We investigated the involvement of programmed cell death (PCD) and autophagy on the mechanism of cell death induced by a total extract (TAE) of alkaloids and fraction (F32) from P. juliflora leaves composed majoritary of juliprosopine in a model of neuron/glial cell co-culture. We saw that TAE (30 µg/mL) and F32 (7...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423082/comparative-analysis-of-two-different-models-of-swimming-applied-to-pregnant-rats-born-small-for-pregnant-age
#7
Silvana B Corvino, Débora C Damasceno, Yuri K Sinzato, Aline O Netto, Nathália C D Macedo, Elena Zambrano, Gustavo T Volpato
The aim of this study was to compare two models of swimming applied to pregnant rats born small for pregnancy age (SPA). Diabetes was chemically induced in adult female rats to develop an inadequate intrauterine environment, leading to birth of a SPA offspring. In adulthood, the female SPA rats were mated and submitted to different swimming programs. The exercise program 1 (Ex1) consisted of swimming for 15 minutes, followed by 15 minutes of rest and another 15 minutes of swimming, 3 days a week before and during pregnancy...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423081/long-wavelength-sensitive-opsin-lws-gene-variability-in-neotropical-cichlids-teleostei-cichlidae
#8
Thomaz M C Fabrin, Sonia Maria A P Prioli, Alberto José Prioli
Cichlid fishes are an important group in evolutionary biology due to their fast speciation. This group depends widely of vision for feeding and reproduction. During the evolutionary process it plays a significant role in interspecific and intraspecific recognition and in its ecology. The molecular basis of vision is formed by the interaction of the protein opsin and retinal chromophore. Long-wavelength sensitive opsin (LWS) gene is the most variable among the opsin genes and it has an ecological significance...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423080/s-and-r-linalool-a-comparison-of-the-in-vitro-anti-aeromonas-hydrophila-activity-and-anesthetic-properties-in-fish
#9
Lenise L Silva, Luana S Balconi, Letícia T Gressler, Quelen I Garlet, Fernando J Sutili, Agueda P C Vargas, Bernardo Baldisserotto, Ademir F Morel, Berta M Heinzmann
Linalool is the main compound of many essential oils and occurs in two isomeric forms: S-(+)- and R-(-)-linalool. This study aimed to determine if linalool isomers have different antimicrobial and anesthetic properties in fish. For this purpose, these compounds were previously isolated from Lippia alba (Mill.)N. E. Brown and Ocimum americanum L. essential oils. Antimicrobial effects were evaluated through the microdilution test against Aeromonas hydrophila, an important fish disease etiologic agent. Induction time until sedation, anesthesia and recovery time were determined in silver catfish (Rhamdia quelen) through bath exposure (60, 180, 300 or 500 μL L-1)...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423079/the-partitioning-of-food-resources-between-two-rodents-in-the-subtropical-region-of-southern-brazil
#10
Fábio P Espinelli, Fabiano Corrêa, Elton P Colares, Ioni G Colares
The capybara (Hydrochoerus hydrochaeris) and nutria (Myocastor coypus) are herbivorous semi-aquatic rodents. Although these rodents occur in sympatry in southern South America, little is known about how the two species interact in relationship to food resources. In this context, the aim of this study was to analyze the food resource overlap, the feeding strategy and the diversity of the diet of capybaras and nutria. A micro-histological analysis of feces was used to study the diets. A total of 48 plant species belonging to 10 families were identified in the diet of H...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423078/characterization-and-bioactivities-of-a-novel-polysaccharide-obtained-from-gracilariopsis-lemaneiformis
#11
Chen-Shan Shi, Ya-Xin Sang, Gui-Qing Sun, Tian-Ye Li, Zheng-Si Gong, Xiang-Hong Wang
Gracilariopsis lemaneiformis is a type of red alga that contains seaweed polysaccharide agar. In this study, a novel non-agar seaweed polysaccharide fraction named GCP (short of crude polysaccharide obtained from Gracilariopsis lemaneiformis) was isolated from Gracilariopsis lemaneiformis. Structural analysis showed that GCP shows triple helical chain conformation when dissolved in water and has many branches and long side chains. Also, 1→3 linkage is the major linkage and the sugar structures are galactopyranose configurations linked by β-type glycosidic linkages...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423077/early-devonian-late-emsian-shark-fin-remains-chondrichthyes-from-the-paran%C3%A3-basin-southern-brazil
#12
Martha Richter, Elvio P Bosetti, Rodrigo S Horodyski
We report on the pioneering discovery of Devonian fish remains in the Paraná Basin, which represents the southernmost record of fishes from that period in mainland South America. The material comes from an outcrop at the lower portion of the São Domingos Formation, within Sequence C of the Paraná-Apucarana sub-basin in Tibagi, State of Paraná. Marine invertebrates are abundant in the same strata. The dark colored fish remains were collected in situ and represent natural moulds of partially articulated shark fin rays (radials)...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423076/transmissivity-of-aquifer-by-capture-zone-method-an-application-in-the-sete-lagoas-karst-aquifer-mg-brazil
#13
Paulo Galvão, Todd Halihan, Ricardo Hirata
Transmissivity is an important hydraulic parameter to determine the amount of water passed horizontally across a given saturated thickness of an aquifer. The techniques to quantify this parameter, such as grain size analyses or pumping tests, can have limitations of time/spatial scale, viability, or economically. One technique that can be used, but little adopted, is the capture zone analysis. In this paper, capture zone analytical equations were used to estimate transmissivity values in order to verify the effectiveness of this methodology as alternative in situations where other traditional methods present implementation difficulties...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423075/glass-microbeads-in-analog-models-of-thrust-wedges
#14
Taynara D'Angelo, Caroline J S Gomes
Glass microbeads are frequently used in analog physical modeling to simulate weak detachment zones but have been neglected in models of thrust wedges. Microbeads differ from quartz sand in grain shape and in low angle of internal friction. In this study, we compared the structural characteristics of microbeads and sand wedges. To obtain a better picture of their mechanical behavior, we determined the physical and frictional properties of microbeads using polarizing and scanning electron microscopy and ring-shear tests, respectively...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423074/7-epi-griffonilide-a-new-lactone-from-bauhinia-pentandra-complete-1h-and-13c-chemical-shift-assignments
#15
Macia C S DE Almeida, Luciana G S Souza, Daniele A Ferreira, Francisco C L Pinto, Débora R DE Oliveira, Gilvandete M P Santiago, Francisco J Q Monte, Raimundo Braz-Filho, Telma L G DE Lemos
A new lactone, 7-epi-griffonilide (1), and six known compounds, 2, 3a - 3c, 4a and 4b, were isolated from the leaves of Bauhinia pentandra (Fabaceae). The structures elucidation of 1 and 2 were based on detailed 2D NMR techniques and spectral comparison with related compounds, leading to complete assignment of the 1H and 13C NMR spectra.
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423073/purification-of-inulinases-by-changing-the-ionic-strength-of-the-medium-and-precipitation-with-alcohols
#16
Simone Golunski, Marceli F Silva, Camila T Marques, Vanusa Rosseto, Rosilene R Kaizer, Altemir J Mossi, Diane Rigo, Rogério M Dallago, Marco DI Luccio, Helen Treichel
The present study evaluated the purification of inulinase by changing the ionic strength of the medium by addition of NaCl and CaCl2 followed by precipitation with n-propyl alcohol or iso-propyl alcohol. The effects of the concentration of alcohols and the rate of addition of alcohols in the crude extract on the purification yield and purification factor were evaluated. Precipitation caused an activation of enzyme and allowed purification factors up to 2.4-fold for both alcohols. The purification factor was affected positively by the modification of the ionic strength of the medium to 0...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423072/editors-of-brazilian-journals-a-hard-life-that-is-getting-harder
#17
EDITORIAL
Alexander W A Kellner
No abstract text is available yet for this article.
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423071/on-topological-groups-with-an-approximate-fixed-point-property
#18
Cleon S Barroso, Brice R Mbombo, Vladimir G Pestov
A topological group G has the Approximate Fixed Point (AFP) property on a bounded convex subset C of a locally convex space if every continuous affine action of G on C admits a net ( x i ) , x i ∈ C , such that x i - g ⁢ x i ⟶ 0 for all g ∈ G . In this work, we study the relationship between this property and amenability.
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28423070/the-extended-log-logistic-distribution-properties-and-application
#19
Stênio R Lima, Gauss M Cordeiro
We propose a new four-parameter lifetime model, called the extended log-logistic distribution, to generalize the two-parameter log-logistic model. The new model is quite flexible to analyze positive data. We provide some mathematical properties including explicit expressions for the ordinary and incomplete moments, probability weighted moments, mean deviations, quantile function and entropy measure. The estimation of the model parameters is performed by maximum likelihood using the BFGS algorithm. The flexibility of the new model is illustrated by means of an application to a real data set...
January 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28273247/richness-and-density-of-aquatic-benthic-macroinvertebrates-after-exposure-to-fungicides-and-insecticides-in-rice-paddy-fields
#20
Alana C D Wandscheer, Enio Marchesan, Sandro Santos, Renato Zanella, Marília F Silva, Guilherme P Londero, Gabriel Donato
The objective of this study was to verify the richness and density of aquatic benthic macroinvertebrates after exposure to fungicides and insecticides of the rice paddy fields. In the crop seasons of 2012/13 and 2013/14, field experiments were performed, which consisted of single-dose applications of the fungicides trifloxystrobin + tebuconazole and tricyclazole, and the insecticides lambda-cyhalothrin + thiamethoxam and diflubenzuron, in 10 m2 experimental plots, over rice plants in the R3 stage. Control plots with and without rice plants were maintained in order to simulate a natural environment...
January 2017: Anais da Academia Brasileira de Ciências
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