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  • 1
    In: Geological Magazine, Cambridge University Press (CUP), Vol. 158, No. 7 ( 2021-07), p. 1253-1268
    Abstract: The recently discovered massive and stockwork sulphide mineralization of Semblana-Rosa Magra and Monte Branco, situated ESE of the Neves–Corvo volcanogenic massive sulphide (VMS) deposit in the Iberian Pyrite Belt (IPB) is presented. Geological setting and tectonic model is discussed based on proxies such as palynostratigraphy and U–Pb zircon geochronology. The mineralization is found within the IPB Volcano-Sedimentary Complex (VSC) Lower sequence, which includes felsic volcanic rocks (rhyolites) with U–Pb ages in zircons of 359.6 ± 1.6 Ma, and black shales of the Neves Formation of late Strunian age. Massive sulphides are enveloped by these shales, implying that felsic volcanism, mineralization and shale sedimentation are essentially coeval. This circumstance is considered highly prospective, as it represents an important exploration vector to target VMS mineralization across the IPB, in areas where the Lower VSC sequence is present. The Upper VSC sequence, with siliciclastic and volcanogenic sedimentary rocks of middle–late Visean age, shows no massive mineralization but a late Tournaisian (350.9 ± 2.3 Ma) volcanism with disseminated sulphides was also identified. Nevertheless, stratigraphic palynological gaps were found within the Strunian and in the Tournaisian sediments, between the Lower and Upper VSC sequences, reflecting probable erosion and uplift mechanisms linked with extensional tectonics. The Semblana and Monte Branco deposits and the Rosa Magra stockwork are enclosed by tectonic sheets that dismembered the VSC sequence in a fold-and-thrust tectonic complex, characteristic of the NE Neves–Corvo region. The methodologies used allow a geological comparison between Neves–Corvo and other IPB mine regions such as Lousal–Caveira, Herrerias, Tharsis and Aznalcollar.
    Type of Medium: Online Resource
    ISSN: 0016-7568 , 1469-5081
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2021
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  • 2
    In: Parasitology, Cambridge University Press (CUP), Vol. 147, No. 11 ( 2020-09), p. 1216-1228
    Abstract: In previous studies, we have identified several families of 5-nitroindazole derivatives as promising antichagasic prototypes. Among them, 1-(2-aminoethyl)-2-benzyl-5-nitro-1,2-dihydro-3 H -indazol-3-one, (hydrochloride) and 1-(2-acetoxyethyl)-2-benzyl-5-nitro-1,2-dihydro-3 H -indazol-3-one (compounds 16 and 24, respectively) have recently shown outstanding activity in vitro over the drug-sensitive Trypanosoma cruzi CL strain (DTU TcVI). Here, we explored the activity of these derivatives against the moderately drug-resistant Y strain (DTU TcII), in vitro and in vivo. The outcomes confirmed their activity over replicative forms, showing IC 50 values of 0.49 (16) and 5.75 μ m (24) towards epimastigotes, 0.41 (16) and 1.17 μ m (24) against intracellular amastigotes. These results, supported by the lack of toxicity on cardiac cells, led to better selectivities than benznidazole (BZ). Otherwise, they were not as active as BZ in vitro against the non-replicative form of the parasite, i.e. bloodstream trypomastigotes. In vivo , acute toxicity assays revealed the absence of toxic events when administered to mice. Moreover, different therapeutic schemes pointed to their capability for decreasing the parasitaemia of T. cruzi Y acute infected mice, reaching up to 60% of reduction at the peak day as monotherapy (16), 79.24 and 91.11% when 16 and 24 were co-administered with BZ. These combined therapies had also a positive impact over the mortality, yielding survivals of 83.33 and 66.67%, respectively, while untreated animals reached a cumulative mortality of 100%. These findings confirm the 5-nitroindazole scaffold as a putative prototype for developing novel drugs potentially applicable to the treatment of Chagas disease and introduce their suitability to act in combination with the reference drug.
    Type of Medium: Online Resource
    ISSN: 0031-1820 , 1469-8161
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    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2020
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  • 3
    In: Journal of Tropical Ecology, Cambridge University Press (CUP), Vol. 38, No. 6 ( 2022-11), p. 462-471
    Abstract: The home-field advantage (HFA) hypothesis establishes that plant litter decomposes faster at ‘home’ sites than in ‘away’ sites due to more specialized decomposers acting at home sites. This hypothesis has predominantly been tested through ‘yes or no’ transplanting experiments, where the litter decomposition of a focal species is quantified near and away from their conspecifics. Herein, we evaluated the occurrence and magnitude of home-field effects on the leaf litter decomposition of Myrcia ramuliflora (O.Berg) N. Silveira (Myrtaceae) along a natural gradient of conspecific litterfall input and also if home-field effects are affected by litter and soil traits. Litter decomposition of M. ramuliflora was assessed through litterbags placed in 39 plots in a tropical heath vegetation over a period of 12 months. We also characterized abiotic factors, litter layer traits, and litter diversity. Our results indicated the occurrence of positive (i.e. Home-field advantage) and negative (i.e. Home-field disadvantage) effects in more than half of the plots. Positive and negative effects occurred in a similar frequency and magnitude. Among all predictors tested, only the community weighted mean C/N ratio of the litterfall input was associated with home-field effects. Our results reinforce the lack of generality for home-field effects found in the literature and thus challenge the understanding of litter-decomposer interaction in tropical ecosystems.
    Type of Medium: Online Resource
    ISSN: 0266-4674 , 1469-7831
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2022
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  • 4
    In: Journal of Dairy Research, Cambridge University Press (CUP), Vol. 88, No. 4 ( 2021-11), p. 457-460
    Abstract: In this Research Communication we focus the food industry´s broad tendency to decrease sugar content in food products onto dulce de leche (DL) and examine the influence of sucrose reduction on the detrimental deposits formed during the production process. The method used to identify the impact produced directly on the heat exchanger during the production of this product with low sucrose content required varying the quantity of sucrose in the milk. Different percentages of sucrose (20, 15, 10, 5 and 0% w/w) were submitted to the DL concentration process in a process simulator. After concentration, the quantification of the deposits formed in each was carried out and these deposits were characterized according to their composition. Methods such as Kjeldahl, Pregl-Dumas and sem -EDS were used. Thus, the work highlights the need to change the product manufacturing process due to changes in the formulation that directly impact the formation of deposits in the equipment used (fouling). This deposit changes significantly in relation to its quantity as well as in relation to the composition and chemical characteristics as the gradual reduction of the sucrose content in the production takes place. Therefore, these impacts must be considered in order to maintain better manufacturing and ensure efficient cleaning of equipment.
    Type of Medium: Online Resource
    ISSN: 0022-0299 , 1469-7629
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2004
    In:  Journal of the Marine Biological Association of the United Kingdom Vol. 84, No. 4 ( 2004-08), p. 857-859
    In: Journal of the Marine Biological Association of the United Kingdom, Cambridge University Press (CUP), Vol. 84, No. 4 ( 2004-08), p. 857-859
    Abstract: Information on Balaenoptera edeni strandings along the Brazilian south-east coast and feeding associations with other marine vertebrates are reported. A total of 19 strandings were observed from 1972 to 2003 along ≈1200 km of coast. Strandings were evenly distributed among seasons with no distinguishable peaks. Besides the stranding data, opportunistic observations on Bryde's whales engaged in feeding activities were reported from nine cruises along São Paulo and Rio de Janeiro State coasts (22–24°S). Bryde's whales were observed preying on Brazilian sardines ( Sardinella brasiliensis ) in at least three events, and possibly two others. Associations with other marine vertebrates were observed, and included dolphin fish ( Coryphaena hippurus ), little tunny ( Euthynnus alletteratus ), unidentified sharks, terns ( Sterna hirundinacea , Sterna spp.), brown boobies ( Sula leucogaster ), frigate birds ( Fregata magnificens ), parasitic jaeger ( Stercorarius cf . parasiticus ), albatrosses ( Thalassarche spp.), and bottlenose dolphins ( Tursiops truncatus ). Stranding data and on-board observations support the hypothesis that Bryde's whales are common in coastal waters of south-eastern Brazil.
    Type of Medium: Online Resource
    ISSN: 0025-3154 , 1469-7769
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2004
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  • 6
    In: Proceedings of the International Astronomical Union, Cambridge University Press (CUP), Vol. 14, No. S351 ( 2019-05), p. 89-92
    Abstract: The VISCACHA (VIsible Soar photometry of star Clusters in tApii and Coxi HuguA † ) Survey is an ongoing project based on deep and spatially resolved photometric observations of Magellanic Cloud star clusters, collected using the SOuthern Astrophysical Research (SOAR) telescope together with the SOAR Adaptive Module Imager. So far we have used 〉 300h of telescope time to observe ∼150 star clusters, mostly with low mass ( M 〈 10 4 M ⊙ ) on the outskirts of the LMC and SMC. With this high-quality data set, we homogeneously determine physical properties using deep colour-magnitude diagrams (ages, metallicities, reddening, distances, mass, luminosity and mass functions) and structural parameters (radial density profiles, sizes) for these clusters which are used as a proxy to investigate the interplay between the Magellanic Clouds and their evolution. We present the VISCACHA survey and its initial results, based on our first two papers. The project’s long term goals and expected legacy to the community are also addressed.
    Type of Medium: Online Resource
    ISSN: 1743-9213 , 1743-9221
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2019
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    SSG: 16,12
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  • 7
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2017
    In:  Cardiology in the Young Vol. 27, No. 3 ( 2017-03), p. 518-529
    In: Cardiology in the Young, Cambridge University Press (CUP), Vol. 27, No. 3 ( 2017-03), p. 518-529
    Abstract: Bicuspid aortic valve is the most common CHD. Its association with early valvular dysfunction, endocarditis, thoracic aorta dilatation, and aortic dissection is well established. Objective The aim of this study was to assess the incidence and predictors of cardiac events in adults with bicuspid aortic valve. Methods We carried out a retrospective analysis of cardiac outcomes in ambulatory adults with bicuspid aortic valve followed-up in a tertiary hospital centre. Outcomes were defined as follows: interventional – intervention on the aortic valve or thoracic aorta; medical – death, aortic dissection, aortic valve endocarditis, congestive heart failure, arrhythmias, or ischaemic heart disease requiring hospital admission; and a composite end point of both. Kaplan–Meier curves were generated to determine event rates, and predictors of cardiac events were determined by multivariate analysis. Results A total of 227 patients were followed-up over 13±9 years; 29% of patients developed severe aortic valve dysfunction and 12.3% reached ascending thoracic aorta dimensions above 45 mm. At least one cardiac outcome occurred in 38.8% of patients, with an incidence rate at 20 years of follow-up of 47±4%; 33% of patients were submitted to an aortic valve or thoracic aorta intervention. Survival 20 years after diagnosis was 94±2%. Independent predictors of the composite end point were baseline moderate–severe aortic valve dysfunction (hazard ratio, 3.19; 95% confidence interval, 1.35–7.54; p 〈 0.01) and aortic valve leaflets calcification (hazard ratio, 4.72; 95% confidence interval, 1.91–11.64; p 〈 0.005). Conclusions In this study of bicuspid aortic valve, the long-term survival was excellent but with occurrence of frequent cardiovascular events. Baseline aortic valve calcification and dysfunction were the only independent predictors of events.
    Type of Medium: Online Resource
    ISSN: 1047-9511 , 1467-1107
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2017
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  • 8
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2008
    In:  Journal of the Marine Biological Association of the United Kingdom Vol. 88, No. 7 ( 2008-11), p. 1417-1423
    In: Journal of the Marine Biological Association of the United Kingdom, Cambridge University Press (CUP), Vol. 88, No. 7 ( 2008-11), p. 1417-1423
    Abstract: Several crab species are important fishery resources in Brazil and their overexploitation has lead to severe population declines in some regions. The management of populations of these species should take into account the degree of gene flow among populations in different estuaries. The goal of the present study is to assess the degree of geographical structure in the genetic diversity of the blue land crab, Cardisoma guanhumi , along the Brazilian coast. A fragment of the control region of the mtDNA (750 bp) was sequenced for 95 specimens collected across 5 Brazilian states. Analyses using F-statistics failed to indicate any evidence of geographical structure, a result that was corroborated by a nested clade analysis of the same dataset. Mismatch distribution analyses indicated that populations of the blue land crab have experienced an expansion during their recent evolutionary past. The obtained results are similar to those recently described for another sympatric crab, Ucides cordatus , particularly with respect to the extensive degree of gene flow. However, populations of C. guanhumi seem to be older than those of U. cordatus and do not show the north–south expansion found in that species.
    Type of Medium: Online Resource
    ISSN: 0025-3154 , 1469-7769
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2008
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    SSG: 12
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  • 9
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2020
    In:  Infection Control & Hospital Epidemiology Vol. 41, No. S1 ( 2020-10), p. s250-s251
    In: Infection Control & Hospital Epidemiology, Cambridge University Press (CUP), Vol. 41, No. S1 ( 2020-10), p. s250-s251
    Abstract: Background: Stenotrophomonas maltophilia is an emerging pathogen responsible for high morbidity and mortality rates. Hospital infections caused by this bacteria, especially in intensive care centers, are concerning for the health system, given that the microorganism is multidrug resistant to most antimicrobials available. Objective: Therefore, the present study is built from an analysis of the variables related to nosocomial infections caused by S. maltophilia in hospitals in Brazil, to display points of major concern. Methods: We used the data collected by the Infection Prevention and Control Service to clarify the incidence rate of Stenotrophomonas maltophilia in Brazilian hospitals as well as the gross lethality of these infections and the profiles of infected patients. We collected and analyzed epidemiological data from 10 hospitals in Brazil for the period July 2014 to June 2019 according to the CDC NHSN protocol. Results: In 5 years, 93 Stenotrophomonas maltophilia infections were diagnosed in the hospitals analyzed. Overall, 61 occurred in men (66%) and 32 occurred in women (34%). Furthermore, 47 cases (51%) occurred in adult ICUs; 19 cases (20%) followed zascular surgery; 9 (10%) cases occurred in the neonatal ICU; 7 (8%) cases were from the medical clinic; and 11 (12%) were from other clinics. The incidence rate was 1.2 cases for 10,000 hospitalizations, ranging from 0.0 to 2.8 (Fig. 1). Patients’ ages ranged from 0 to 90 years, with a mean of 55 years (SD, 26 years) and a median of 64 years. Time between admission and diagnosis of infection was 1 to 102 days, with a mean of 24 days (SD, 21 days) and a median of 17 days. The gross lethality for S. maltophilia infection was 43 of 93 (46%) (95% CI, 35.8%–56.9%). The frequencies of specific infections were as follows (Fig. 2): pneumonia, 26 (28%); tracheobronchitism, 22 (24%); primary bloodstream infection, 18 (19%); skin and soft-tissue infection, 13 (14%); local infection, 7 (8%); vascular access infection, 3 (3%); urinary tract infection, 2 (2%); gastrointestinal infection, 1 (1%); and eye, nose, throat, and mouth infections, 1 (1%). Conclusions: Stenotrophomonas maltophilia infection is a rare and highly lethal event that usually occurs after 2 weeks of hospitalization. The most affected region is the respiratory tract, with a higher incidence in patients aged 〉 60 years or in the ICU. Early and accurate investigations of multiresistant microorganisms in a hospital setting are needed to reduce patient morbidity and mortality. Funding: None Disclosures: None
    Type of Medium: Online Resource
    ISSN: 0899-823X , 1559-6834
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2020
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  • 10
    In: Cardiology in the Young, Cambridge University Press (CUP), Vol. 29, No. 7 ( 2019-07), p. 1008-1008
    Type of Medium: Online Resource
    ISSN: 1047-9511 , 1467-1107
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2019
    detail.hit.zdb_id: 2060876-7
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