108 results on '"F. Alves"'
Search Results
2. COVID-19 vaccines effectiveness against symptomatic disease and severe outcomes, 2021–2022: a test-negative case–control study
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C. Brazete, J. Brazete, F. Alves, A. Aguiar, A.M. Gonçalves, M. Cardoso, L. Sá, E. Gonçalves, M. Pinto, and R. Duarte
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Public Health, Environmental and Occupational Health ,General Medicine - Published
- 2023
3. Recovery in normobaric hypoxia as an additional stimulus for high-intensity intermittent training
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C. Dellavechia de Carvalho, G. Marcolino Putti, Y. Figueiredo Foresti, F. Alves Ribeiro, J. Causin Andreossi, G. Ferraz de Campos, and M. Papoti
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Orthopedics and Sports Medicine - Published
- 2023
4. Contrasting Carbon Cycle Responses to Dry (2015 El Niño) and Wet (2008 La Niña) Extreme Events at an Amazon Tropical Forest
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Natalia Restrepo-Coupe, Kleber Silva Campos, Luciana F. Alves, Marcos Longo, Kenia T. Wiedemann, Raimundo Oliveira-Junior, Luiz E. O. C. Aragao, Bradley O'Donnell Christoffersen, Plinio Barbosa de Camargo, Adelaine M. e. S. Figueira, Maurício Lamano Ferreira, Rafael S. Oliveira, Deliane Penha, Neill Prohaska, Alessandro C. da Araujo, Bruce C. Daube, Steven C. Wofsy, and Scott R. Saleska
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- 2023
5. Efficiency comparison of proactive approaches to deal with machine failures*
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Fernanda F. Alves and Martin G. Ravetti
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Control and Systems Engineering - Published
- 2022
6. Papular Lesions With Blaschkoide Distribution in a 51-Year-Old Male
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F. Alves, A. Matos, and J.C. Cardoso
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General Medicine - Published
- 2023
7. [Artículo traducido] Lesiones papulares con distribución blaschkoide en un varón de 51 años
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F. Alves, A. Matos, and J.C. Cardoso
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General Medicine - Published
- 2023
8. Assessing efficiency in public service obligations in European air transport using Data Envelopment Analysis
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António Ramos Andrade, João L. Costa, Tiago M. F. Alves, and Sofia Kalakou
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Ciências Sociais::Sociologia [Domínio/Área Científica] ,Ciências Sociais::Geografia Económica e Social [Domínio/Área Científica] ,Geography, Planning and Development ,Engenharia e Tecnologia::Engenharia Civil [Domínio/Área Científica] ,European air transport ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,Transportation ,Subsidy ,Environmental economics ,Urban Studies ,Benchmarking ,Data Envelopment Analysis ,Order (exchange) ,Data envelopment analysis ,media_common.cataloged_instance ,Profitability index ,Public service ,Business ,European union ,Public service obligations ,Empirical evidence ,Productivity ,media_common - Abstract
In recent years, the use of Public Service Obligations (PSOs) in air transport policy has substantially increased. In remote regions, where air transport services are not profitable, the application of this subsidy program is crucial for the economic and social development of these regions. However, there is a great diversity in the provision of PSO services among different regions in Europe. Therefore, it is essential to assess the performances of the air carriers operating in different PSO routes. The present study uses Data Envelopment Analysis (DEA) to assess the efficiency of PSO routes within the European Union and compares them with the performances of the operating airlines, both when operating under this subsidy program and when operating their regular flights. First, DEA was applied to the annual data of several European airlines, and then applied to the data of their PSO routes, so that a comparison can be made between the performance obtained on regular flights and flights under the PSO regime. The results identify which airlines had the best and worst performances, as well as the routes and respective regions of Europe where the airlines tend to score higher and lower in terms of efficiency. Results suggest that the Nordic European countries and the United Kingdom were the regions where air carriers obtained the lowest results, and thus, this empirical evidence should support the public authorities to consider revisiting their PSO contracts, in order to improve their operation. info:eu-repo/semantics/acceptedVersion
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- 2021
9. Trait interactions effects on tropical tree demography depend on the environmental context
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Vitor de A. Kamimura, Priscilla de P. Loiola, Carlos P. Carmona, Marco A. Assis, Carlos A. Joly, Flavio A.M. Santos, Simone A. Vieira, Luciana F. Alves, Valéria F. Martins, Eliana Ramos, Rafael F. Ramos, and Francesco de Bello
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Plant Science ,Ecology, Evolution, Behavior and Systematics - Published
- 2023
10. Preparation and evaluation of polymeric nanocomposites based on EVA/montmorillonite, EVA/palygorskite and EVA/halloysite as pour point depressants and flow improvers of waxy systems
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Bruna F. Alves, Bruna K.M. Silva, Camila A. Silva, Gustavo G. Celestino, Rita C.P. Nunes, and Elizabete F. Lucas
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Fuel Technology ,General Chemical Engineering ,Organic Chemistry ,Energy Engineering and Power Technology - Published
- 2023
11. Ent-kaurenoic acid-enriched Mikania glomerata leaves-complexed β-cyclodextrin: Pharmaceutical development and in vivo antitumor activity in a sarcoma 180 mouse model
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Ângela V F, Alves, Carlisson R, Melo, José L, Chagas-Neto, Ricardo G, Amaral, Sérgio R, Ambrósio, Monique R, Moreira, Rodrigo C S, Veneziani, Juliana C, Cardoso, Patricia, Severino, Rogério O, Gondak, Eliana B, Souto, and Ricardo L C, de Albuquerque-Júnior
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Pharmaceutical Science - Abstract
The extract obtained from Mikania glomerata leaves rich in ent-kaurenoic acid (ERKA) shows cytotoxic activity in vitro, but its hydrophobic nature and thermosensitivity are issues to be solved prior to in vivo antitumor studies. The purpose of this study was to investigate the antitumor activity of inclusion complexes formed between ERKA and β-cyclodextrin (ERKA:β-CD) in rodents. ERKA:β-CD complexes obtained by malaxation (MX) and co-evaporation (CE) methods were firstly characterized regarding their physical properties, encapsulation efficiency, and cytotoxicity againts L929 cells. The antitumor activity study was then performed in mice with sarcoma 180 treated with saline, 5-fluouracil (5FU) and ERKA:β-CD at 30, 100 and 300 µg/kg. The weight, volume, percentage of inhibition growth, gross and pathological features and positivity for TUNEL, ki67, NFκB and NRF2 in the tumors were assessed. Serum lactate-dehydrogenase activity (LDH), white blood cells count (WBC) and both gross and pathological features of the liver, kidneys and spleen were also evaluated. The formation of the inclusion complexes was confirmed by thermal analysis and FTIR, and they were non-toxic for L929 cells. The MX provided a better complexation efficiency. ERKA:β-CD300 promoted significant tumor growth inhibition, and attenuated the tumor mitotic activity and necrosis content, comparable to 5-fluorouracil. ERKA:β-CD300 also increased TUNEL-detected cell death, reduced Ki67 and NF-kB immunoexpression, and partially inhibited the serum LDH activity. No side effect was observed in ERKA:β-CD300-treated animals. The ERKA:β-CD inclusion complexes at 300 µg/kg displays antitumour activity in mice with low systemic toxicity, likely due to inhibition on the NF-kB signaling pathway and LDH activity.
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- 2023
12. Development and validation of a Paediatric Early Warning Score for use in the emergency department: a multicentre study
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Frank J Smit, Ewout W. Steyerberg, Claudio F. Alves, Ian Maconochie, Henriëtte A. Moll, Johan van der Lei, Susanne Greber-Platzer, Daan Nieboer, Paul Avillach, Joany M Zachariasse, and Maria Tsolia
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Male ,medicine.medical_specialty ,Adolescent ,03 medical and health sciences ,0302 clinical medicine ,030225 pediatrics ,Developmental and Educational Psychology ,medicine ,Humans ,media_common.cataloged_instance ,Prospective Studies ,030212 general & internal medicine ,European union ,Child ,media_common ,medicine.diagnostic_test ,business.industry ,Infant ,Emergency department ,Capillary refill ,Early warning score ,Triage ,Early Warning Score ,Child, Preschool ,Pediatrics, Perinatology and Child Health ,Cohort ,Emergency medicine ,Female ,Observational study ,Ordered logit ,Emergency Service, Hospital ,business - Abstract
Summary Background Paediatric Early Warning Scores (PEWSs) are being used increasingly in hospital wards to identify children at risk of clinical deterioration, but few scores exist that were designed for use in emergency care settings. To improve the prioritisation of children in the emergency department (ED), we developed and validated an ED-PEWS. Methods The TrIAGE project is a prospective European observational study based on electronic health record data collected between Jan 1, 2012, and Nov 1, 2015, from five diverse EDs in four European countries (Netherlands, the UK, Austria, and Portugal). This study included data from all consecutive ED visits of children under age 16 years. The main outcome measure was a three-category reference standard (high, intermediate, low urgency) that was developed as part of the TrIAGE project as a proxy for true patient urgency. The ED-PEWS was developed based on an ordinal logistic regression model, with cross-validation by setting. After completing the study, we fully externally validated the ED-PEWS in an independent cohort of febrile children from a different ED (Greece). Findings Of 119 209 children, 2007 (1·7%) were of high urgency and 29 127 (24·4%) of intermediate urgency, according to our reference standard. We developed an ED-PEWS consisting of age and the predictors heart rate, respiratory rate, oxygen saturation, consciousness, capillary refill time, and work of breathing. The ED-PEWS showed a cross-validated c-statistic of 0·86 (95% prediction interval 0·82–0·90) for high-urgency patients and 0·67 (0·61–0·73) for high-urgency or intermediate-urgency patients. A cutoff of score of at least 15 was useful for identifying high-urgency patients with a specificity of 0·90 (95% CI 0·87–0·92) while a cutoff score of less than 6 was useful for identifying low-urgency patients with a sensitivity of 0·83 (0·81–0·85). Interpretation The proposed ED-PEWS can assist in identifying high-urgency and low-urgency patients in the ED, and improves prioritisation compared with existing PEWSs. Funding Stichting de Drie Lichten, Stichting Sophia Kinderziekenhuis Fonds, and the European Union's Horizon 2020 research and innovation programme.
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- 2020
13. Structural Analysis of the Bulbospongiosus Muscle in Patients With Bulbar Urethral Strictures
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Francisco J.B. Sampaio, Luciano A. Favorito, Edilaine F. Alves, Carla B. M. Gallo, and Waldemar S. Costa
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Male ,medicine.medical_specialty ,Penile Diseases ,Urethral stricture ,Urology ,Urethroplasty ,medicine.medical_treatment ,Bulbospongiosus muscle ,030232 urology & nephrology ,Constriction, Pathologic ,03 medical and health sciences ,Postoperative Complications ,0302 clinical medicine ,Urethra ,medicine ,Humans ,Penile cancer ,Body Weights and Measures ,Correlation of Data ,Urethrostomy ,Urethral Stricture ,business.industry ,Middle Aged ,Plastic Surgery Procedures ,medicine.disease ,Immunohistochemistry ,Hypospadias ,030220 oncology & carcinogenesis ,Elasticity Imaging Techniques ,Urologic Surgical Procedures ,business ,Bulbar urethral stricture ,Brazil ,Penis ,Open Prostatectomy - Abstract
OBJECTIVE To characterize the bulbospongiosus muscle (BSM) in patients with bulbar urethral strictures. MATERIALS AND METHODS We studied 21 patients divided into 2 groups: Stricture Group (n = 14; mean age = 62.00 years) with bulbar stricture submitted to open urethroplasty; and Control Group (n = 7; mean age = 60.14 years) with penile strictures (hypospadias cripples, penile cancer and/or penile infection) who were submitted to perineal urethrostomy. Samples of the BSM were dissected and histologic sections were stained by histochemical and immunohistochemical techniques. Histomorphometric analyzes were performed on photomicrographs. Means were statistically compared using the unpaired Student t test and the Mann-Whitney test (P RESULTS The etiology of bulbar urethral stricture was idiopathic in 2 cases (14.29%), post-TURP in 6 (42.86%), post open radical prostatectomy in 5 (35.71%) and post open prostatectomy in 1 case (7.14%). The average length of the stricture was 2.08 cm. The only parameter analyzed with significant difference between the groups was the vessels (significant difference between the control group: 5.11 ± 1.98% and stricture group: 3.57 ± 1.32%, P = .0460). The quantitative analysis of collagen (Control Group: 10.63 ± 5.37% and Stricture Group: 10.83 ± 4.55%, P = .9296); diameter of BSM muscle fibers (Control Group: 41.71 ± 14.63 µm and Stricture Group: 40.11 ± 8.59 µm, P = .76 and elastic system fibers (Control Group; 3.83 ± 1.54% and Stricture Group: 5.43 ± 2.90%, P = .2601) showed no significant difference. CONCLUSIONS Histologic analysis showed a significant decrease of the BSM vessels in urethral stricture, without changes in elastic fibers, collagen, nerves, and muscle fiber diameter. These findings show that the bulbar urethral stricture causes minimal alterations in the structure of the BSM.
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- 2020
14. A new eco-friendly strategy for chromium determination in stainless steels: Electrolytic dissolution followed by voltammetric detection
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Bruno L.M. Fernandes, Guilherme F. Alves, Thalles P. Lisboa, and Denise Lowinsohn
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Spectroscopy ,Analytical Chemistry - Published
- 2022
15. Experimental slug flow dissipation analysis in pipes with horizontal to inclined downward direction change
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Hedilberto A.A. Barros, Rômulo L.P. Rodrigues, Rafael F. Alves, Cristiane Cozin, Hendy T. Rodrigues, Roberto da Fonseca Junior, Marco J. da Silva, Moisés A. Marcelino Neto, and Rigoberto E.M. Morales
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Fluid Flow and Transfer Processes ,Nuclear Energy and Engineering ,Mechanical Engineering ,General Chemical Engineering ,Aerospace Engineering - Published
- 2022
16. Learning algorithms to deal with failures in production planning
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Fernanda F. Alves, Thiago H. Nogueira, and Martín G. Ravetti
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General Computer Science ,General Engineering - Published
- 2022
17. Strength training with intermittent blood flow restriction improved strength without changes in neural aspects on quadriceps muscle
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F.M.P. de Castro, Enrico Fuini Puggina, Lucas de Paula Oliveira, H. Tourinho Filho, and Guilherme F. Alves
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medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,Strength training ,Quadriceps muscle ,030209 endocrinology & metabolism ,030229 sport sciences ,Electromyography ,Physical strength ,Vascular occlusion ,Blood flow restriction ,03 medical and health sciences ,Neural activity ,0302 clinical medicine ,Physical medicine and rehabilitation ,Medicine ,Orthopedics and Sports Medicine ,Spectral analysis ,medicine.symptom ,business - Abstract
Summary Objective The purpose of this study was to investigate the effects of low-intensity strength training with vascular occlusion on specific parameters of neural drive using amplitude and spectral analysis of surface electromyography. Equipment and methods Twenty individuals were assigned to one of two groups (low-intensity strength training with or without vascular occlusion). The first group performed three sets of knee extension exercises until failure, with a 90 seconds interval between sets, while the second group performed three sets of the mean repetitions of the first group. Both groups performed the exercises with the load set at 20% of estimated 1 maximal repetition. To assess electromyographic parameters, sessions 1, 7 and 12 were evaluated, specifically from the first to third repetitions and the 3 final repetitions. One maximal repetition was measured in the same collection times. Results Our findings demonstrated that low-intensity strength training with vascular occlusion improved muscular strength; however, it did not affect the neural drive, since there were no differences in the investigated parameters between sessions. Conclusion Low-intensity strength training with vascular occlusion is effective for producing muscular strength; however, it is not indicated for increases in neural activity.
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- 2019
18. Effects of hot rolling on the microstructure, thermal and mechanical properties of CuAlBeNbNi shape memory alloy
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Marcus T.M.A. Pedrosa, David D.S. Silva, Ieverton C.A. Brito, Ricardo F. Alves, Rafael E. Caluête, Rodinei M. Gomes, and Danniel F. Oliveira
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Physical and Theoretical Chemistry ,Condensed Matter Physics ,Instrumentation - Published
- 2022
19. High-content multi-frequency impedance cell monitoring for label-free and time-resolved cell toxicity analysis of various cell types
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A. Nörenberg, Krisztina Juhasz, Niels Fertig, M. Ziller, T Johannssen, Ulrich Thomas, F. Alves, O. Reinhardt, Elena Dragicevic, and Sonja Stölzle-Feix
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Cell type ,medicine.anatomical_structure ,Chemistry ,Cell toxicity ,Content (measure theory) ,Cell ,Biophysics ,medicine ,General Medicine ,Toxicology ,Electrical impedance ,Label free - Published
- 2021
20. Isolated Bullae of the Scrotum in an 87 Year-Old-Man
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A. Pinho, J.C. Cardoso, and F. Alves
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medicine.medical_specialty ,Histology ,medicine.anatomical_structure ,business.industry ,Scrotum ,medicine ,Dermatology ,business ,Pathology and Forensic Medicine - Published
- 2021
21. Ampollas aisladas del escroto en un varón de 87 años
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A. Pinho, J.C. Cardoso, and F. Alves
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RL1-803 ,Dermatology ,General Medicine ,Internal medicine ,RC31-1245 - Published
- 2021
22. VOCs profile of Colletotrichum spp. as a potential tool for quality control of açaí pulp
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Raulem Santana dos Santos, Simone S. Silva, Marilene Nunes Oliveira, Sebastião C. Silva, Kézia F. Alves, Darlisson de A. Santos, Adriano de Araújo Gomes, Licarion Pinto, Maria da Conceição F. de Oliveira, and Tatiane da C. Lima
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Quality Control ,Euterpe ,Dried fruit ,engineering.material ,01 natural sciences ,Gas Chromatography-Mass Spectrometry ,Analytical Chemistry ,chemistry.chemical_compound ,0404 agricultural biotechnology ,Colletotrichum ,Food Quality ,Solid Phase Micro Extraction ,Food science ,Solid Phase Microextraction ,Plant Diseases ,Volatile Organic Compounds ,biology ,Cheminformatics ,Pulp (paper) ,fungi ,010401 analytical chemistry ,04 agricultural and veterinary sciences ,General Medicine ,biology.organism_classification ,040401 food science ,Menthone ,Terpenoid ,0104 chemical sciences ,chemistry ,Fruit ,engineering ,Gas chromatography–mass spectrometry ,Food Science - Abstract
Colletotrichum has been identified as responsible for the “dried fruit” disease in acai (Euterpe oleracea). Besides concern for acai pulp quality control, the characterization of Colletotrichum has been difficult, which has motivated the search for chemical markers in the Volatile Organic Compounds (VOCs) profile for use as a tool in the identification of acai pulp contaminated by the fungus. Extracted VOCs by Headspace - Solid Phase Micro Extraction (HS-SPME) were identified through gas chromatography mass spectrometry (GC–MS). From GC–MS analyzes 26 VOCs were identified, with a predominance of the terpenoids. Chemometrically, menthol and menthone were assigned as potential markers of the genus. The analysis of VOCs in acai pulps contaminated by Colletotrichum under different cultivation conditions enabled the detection of menthone. This result illustrated the selectivity of the culture medium and the potential of this tool for use in the quality control of acai pulp.
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- 2021
23. TIBIAL METASTASIS AS INITIAL PRESENTATION OF SQUAMOUS CELL LUNG CANCER
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Carolina Alves, José F. Alves, Ana Mendes, Maria Carolina Carvalho, Margarida Pereira, and Ricardo Jacó de Oliveira
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Pulmonary and Respiratory Medicine ,Oncology ,medicine.medical_specialty ,business.industry ,Internal medicine ,medicine ,Presentation (obstetrics) ,Cardiology and Cardiovascular Medicine ,Critical Care and Intensive Care Medicine ,medicine.disease ,business ,Squamous cell lung cancer ,Metastasis - Published
- 2021
24. The medial preoptic area modulates autonomic function under resting and stress conditions
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América A. Scopinho, Eduardo Albino Trindade Fortaleza, Aline Fassini, Fernando H. F. Alves, and Fernando M.A. Correa
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Male ,Restraint, Physical ,0301 basic medicine ,medicine.medical_specialty ,Mean arterial pressure ,Rest ,Blood Pressure ,Neurotransmission ,Baroreflex ,Autonomic Nervous System ,Body Temperature ,03 medical and health sciences ,0302 clinical medicine ,Heart Rate ,Internal medicine ,Heart rate ,medicine ,Animals ,Rats, Wistar ,business.industry ,General Neuroscience ,ESTRESSE PSICOLÓGICO ,Preoptic Area ,Rats ,Preoptic area ,Autonomic nervous system ,030104 developmental biology ,Endocrinology ,Hypothalamus ,medicine.symptom ,business ,Stress, Psychological ,030217 neurology & neurosurgery ,Vasoconstriction - Abstract
The medial preoptic area (mPOA) participates in the temperature and cardiovascular control. The mPOA receives inputs from limbic structures and sends projections to hypothalamus and brainstem. Moreover, stress elicits pronounced neuronal activation in mPOA, suggesting its involvement in central neural pathway mediating stress responses. In the present study, we report the effect of acute mPOA neurotransmission inhibition using cobalt chloride (CoCl2-nonselective synapse blocker) on the mean arterial pressure (MAP), heart rate (HR), body and tail temperature (Tbody and Ttail, respectively), as well as on the HR component of baroreflex. We also verified the participation of mPOA in the autonomic changes evoked by acute restraint stress (RS). Our results demonstrated that microinjection of CoCl2 into mPOA caused tachycardia, hyperthermia and a Ttail decrease, without altering MAP. The inhibition of mPOA with CoCl2 increased the sympathetic component of cardiac baroreflex when assessed 10min after its administration. In addition, pretreatment of mPOA with CoCl2 increased RS-evoked tachycardic and hyperthermic responses evoked by RS when compared with aCSF-treated animals, without affecting the RS-evoked pressor response and the fall in Ttail. In summary, our results suggest that mPOA exerts a tonic inhibitory influence on the sympathetic cardiac tone under both rest and stress conditions, modulating negatively the sympathetic component of baroreflex. Results also confirm the mPOA involvement in the control of body temperature because its inhibition was followed by a sustained increase in body temperature and vasoconstriction in the tail artery territory.
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- 2017
25. Outcomes of a native bamboo on biomass and carbon stocks of a neotropical biodiversity hotspot
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Talita Soares Reis, Carlos Alfredo Joly, Simone Aparecida Vieira, Luciana F. Alves, and Maíra de Campos Gorgulho Padgurschi
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0106 biological sciences ,Bamboo ,Biomass (ecology) ,biology ,Ecology ,Species diversity ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Biodiversity hotspot ,Geography ,Liana ,Merostachys ,Ecosystem ,Terrestrial ecosystem ,Ecology, Evolution, Behavior and Systematics ,010606 plant biology & botany ,Nature and Landscape Conservation - Abstract
Old-growth tropical forests provide an essential climate regulation service to humans, functioning as carbon (C) sink due to the high productivity, species diversity, and variety of life forms, such as bamboos. Bamboos growth fast and display plastic functional traits, which favor the occupation of environments under different conditions, making them efficient C stockers in addition to providing raw material for local human populations. Asian bamboos are known to sequester considerable amounts of C in a short time, and although is likely that New World bamboo species have the same capacity, this perspective is rarely addressed. To evaluate the impact of a native bamboo on biomass and carbon stocks of an Atlantic Forest Protected Area, we first developed an allometric equation to estimate its live aboveground biomass (AGB) based on the destructive sampling method. We then compare our results to the AGB of forest components previously estimated for the same area, as well as to Asian and other Neotropical bamboo species to place our case study in a global scenario. In four 1-ha permanent plots in Sao Paulo State, Brazil, we made a census of all live culms and collected 20 healthy ones for equations purposes. The Merostachys neesii Rupr. (Poaceae) studied species has 343 clumps ha−1, 3663 culms ha−1, and 12.1 Mg ha−1 of biomass (5.2 Mg C ha−1) or 4% of total AGB and C stocks of the studied area. M. neesii's contributes as much as palms solely, but more than lianas and tree ferns together for the total AGB in the old-growth Montane Atlantic Forest we studied. These results show that the non-inclusion of bamboos may underestimate the role of terrestrial ecosystems in buffering anthropogenic CO2. The comprehension of bamboo ecology is crucial for conservation and management purposes, and it is relevant since, with global warming, the C stored may be released turning these ecosystems into source instead of a sink of C.
- Published
- 2021
26. Power budget of direct-detection ultra-dense WDM-Nyquist-SCM PON with low-complexity SSBI mitigation
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Adolfo V. T. Cartaxo, Tiago M. F. Alves, and Ricardo O. J. Soeiro
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Physics ,business.industry ,Subcarrier multiplexing ,Electrical engineering ,02 engineering and technology ,Spectral efficiency ,Passive optical network ,Power budget ,Multiplexing ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,QAM ,020210 optoelectronics & photonics ,Control and Systems Engineering ,Wavelength-division multiplexing ,0202 electrical engineering, electronic engineering, information engineering ,Optical line termination ,Electronic engineering ,Electrical and Electronic Engineering ,business ,Instrumentation - Abstract
The power budget (PB) of a direct-detection ultra-dense wavelength division/subcarrier multiplexing (SCM) passive optical network (PON) is assessed numerically for downstream, when a low-complexity iterative signal-to-signal beat interference (SSBI) mitigation technique is employed. Each SCM signal, inserted in a 12.5 GHz width optical channel, is comprised of two or three electrically generated and multiplexed 16-quadrature-amplitude-modulation (QAM) or 32-QAM Nyquist pulse-shaped subcarriers, each with a 7% forward error correction bit rate of 10.7 Gbit/s. The PB and maximum number of optical network units (ONUs) served by each optical line terminal (OLT) are compared with and without SSBI mitigation. When SSBI mitigation is realized, PB gains up to 4.5 dB are attained relative to the PB in the absence of SSBI mitigation. The PB gain enabled by the SSBI mitigation technique proposed in this work increases the number of ONUs served per OLT at least by a factor of 2, for the cases of higher spectral efficiency. In particular, for a SCM signal comprised of three subcarriers, the maximum number of ONUs served per OLT is between 2 and 32, and between 8 and 64, in the absence of SSBI mitigation, and when SSBI mitigation is employed, respectively, depending on the fiber length (up to 50 km) and order of QAM.
- Published
- 2017
27. Enhanced magnetic hyperthermia of CoFe2O4 and MnFe2O4 nanoparticles
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André F. Alves, Sofia G. Mendo, Maria Deus Carvalho, J. Ramos, L.P. Ferreira, Margarida Cruz, and Maria Helena Godinho
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Materials science ,Aqueous solution ,Mechanical Engineering ,Metals and Alloys ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,Thermal treatment ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,SQUID ,Magnetic hyperthermia ,Chemical engineering ,Mechanics of Materials ,law ,Mössbauer spectroscopy ,Materials Chemistry ,Magnetic nanoparticles ,Hydrothermal synthesis ,0210 nano-technology - Abstract
CoFe2O4 and MnFe2O4 nanoparticles were obtained by hydrothermal synthesis method in aqueous and in gelatinous media, at 175 °C and 230 °C. The structural, morphological and magnetic characterization of all samples was performed using different techniques: XRD, SEM, TEM, SQUID magnetometry and 57Fe Mossbauer spectroscopy. Their ability to be used as nanoheaters for magnetic hyperthermia applications was evaluated by determining their heating efficiency in aqueous suspension. The mean size of the CoFe2O4 nanoparticles ranges from 4.2 to 6.7 nm, while larger nanoparticles with broader distributions were obtained for the MnFe2O4 nanoparticles (from 4.4 to 17 nm). It was shown that both the temperature of the thermal treatment and the medium influence the mean size and size distribution of the nanoparticles, with the gelatin-assisted synthesis method producing nanoparticles with the highest specific heating ability. MnFe2O4 nanoparticles synthesized at 175 °C in gelatine medium display one of the best reported heating efficiency for manganese ferrite with values comparable to those of commercial magnetic nanoparticles.
- Published
- 2017
28. Main pathways of action of Brazilian red propolis on the modulation of neutrophils migration in the inflammatory process
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Pedro Luiz Rosalen, Thiago M. Cunha, David F. Colón, Bruno Bueno-Silva, Severino Matias de Alencar, Marcelo Henrique Napimoga, Marcelo Franchin, Carina Denny, and Claudiney F. Alves
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Male ,0301 basic medicine ,Chemokine ,Receptors, CXCR3 ,Neutrophils ,PRÓPOLIS ,Chemokine CXCL2 ,Anti-Inflammatory Agents ,Pharmaceutical Science ,Inflammation ,Pharmacology ,Propolis ,03 medical and health sciences ,Peritoneal cavity ,Cell Movement ,Drug Discovery ,medicine ,Animals ,Mice, Inbred BALB C ,biology ,Chemistry ,Anti-Inflammatory Agents, Non-Steroidal ,Chemotaxis ,CXCL1 ,Chemotaxis, Leukocyte ,030104 developmental biology ,medicine.anatomical_structure ,Complementary and alternative medicine ,Mechanism of action ,Immunology ,biology.protein ,Cytokines ,Molecular Medicine ,medicine.symptom ,Brazil ,Intravital microscopy - Abstract
Brazilian propolis is popularly used as treatment for different diseases including the ones with inflammatory origin. Brazilian red propolis chemical profile and its anti-inflammatory properties were recently described however, its mechanism of action has not been investigated yet.Elucidate Brazilian red propolis major pathways of action on the modulation of neutrophil migration during the inflammatory process.The ethanolic extract of propolis (EEP) activity was investigated for neutrophil migration into the peritoneal cavity, intravital microscopy (rolling and adhesion of leukocytes), quantification of cytokines TNF-α, IL-1β and chemokines CXCL1/KC, CXCL2/MIP-2, neutrophil chemotaxis induced by CXCL2/MIP-2, calcium influx and CXCR2 expression on neutrophils.EEP at 10mg/kg prevented neutrophil migration into peritoneal cavity (p 0.05), reduced leukocyte rolling and adhesion on the mesenteric microcirculation (p 0.05) and inhibited the release TNF-α, IL-1β, CXCL1/KC and CXCL2/MIP-2 (p 0.05). EEP at 0.01, 0.1 and 1µg/ml reduced the CXCL2/MIP-2-induced neutrophils chemotaxis (p 0.05) without affect cell viability (p 0.05).EEP at 1µg/ml decreased the calcium influx induced by CXCL2/MIP-2 (p0.05). On the other hand, none of EEP concentrations tested altered CXCR2 expression by neutrophils (p0.05).Brazilian red propolis appears as a promising anti-inflammatory natural product which mechanism seems to be by reducing leukocyte rolling and adhesion; TNF-α, IL-1β, CXCL1/KC and CXCL2/MIP-2 release; CXCL2/MIP-2-induced chemotaxis and calcium influx.
- Published
- 2016
29. A DNS/URANS approach for simulating rough-wall turbulent flows
- Author
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F. Alves Portela and Neil D. Sandham
- Subjects
Fluid Flow and Transfer Processes ,Turbulence ,Mechanical Engineering ,Flow (psychology) ,Direct numerical simulation ,02 engineering and technology ,Mechanics ,Surface finish ,Condensed Matter Physics ,01 natural sciences ,010305 fluids & plasmas ,Physics::Fluid Dynamics ,Momentum ,Boundary layer ,020303 mechanical engineering & transports ,0203 mechanical engineering ,0103 physical sciences ,Reynolds-averaged Navier–Stokes equations ,Mathematics ,Parametric statistics - Abstract
A novel hybrid method combining direct numerical simulation (DNS) and the Reynolds-averaged Navier Stokes (RANS), denoted as a stress-blended method (SBM), has been developed. The SBM is targeted at simulating turbulent flows over arbitrary rough surfaces in which computational savings can be achieved by making the DNS domain as small as possible. Within the SBM framework, a RANS model is enforced above the roughness layer to prevent the momentum build-up which arises in simulations where the computational domain is too small to represent the largest eddies. The SBM is validated for turbulent channel flow, both for smooth wall turbulence and using a parametric forcing approach to mimic roughness effects, with a computational cost that scales linearly with Re τ . The method is then applied to selected subsets of a scanned grit-blasted surface. For the same subset, the roughness function is found to be within 1 % of available DNS. Comparisons of small and large subsets showed differences of over a factor of two in equivalent sand grain roughness, indicating the importance of choosing representative surface samples. Simulations in the fully rough regime are carried out using one to two orders of magnitude fewer points than in a typical DNS. Since no assumptions on the roughness properties or the flow structure (such as outer layer similarity) are made, we expect the SBM to be applicable to non-equilibrium turbulent boundary layer flows.
- Published
- 2020
30. Urban critical infrastructure disruption after a radiological dispersive device event
- Author
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Daniel F. Alves, Claudio A. Federico, Ricardo M. Stenders, Ademir Xavier da Silva, Eduarda Victória S.L. Andrade, André Luiz Queiroga Reis, Edson R. Andrade, and Isabela S. Alves
- Subjects
Urban region ,Nuclear Weapons ,010504 meteorology & atmospheric sciences ,business.industry ,Health, Toxicology and Mutagenesis ,General Medicine ,010501 environmental sciences ,01 natural sciences ,Pollution ,Critical infrastructure ,Transport engineering ,Software ,Cesium Radioisotopes ,Radiation Monitoring ,Public transport ,Radiological weapon ,Health physics ,Radioactive contamination ,Environmental Chemistry ,Environmental science ,Ease of Access ,Computer Simulation ,business ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
This study aims to evaluate the impacts of the activation of a hypothetical radiological dispersal device (RDD) on the urban critical infrastructure (health facilities and public transport). A densely populated urban region was chosen as a scenery. Additionally, the influence of local environmental factors in the post-detonation process was verified. The source term was Cs-137 due to its mobility in the environment and relative ease of access. The approach used for the evaluation of the consequences was a computer simulation by Gaussian modeling. The HotSpot Health Physics Codes software was applied in conjunction with the RESRAD-RDD software. The results suggest that there is a strong influence of the local atmospheric stability classes (Pasquill-Gifford classes) on both the total equivalent effective dose (TEDE) and soil contamination. Consequently, the impacts on critical urban infrastructure follow the same trend. The method used for comparing the simulated and reference limits was the proportional ratio. All calculated values for radioactive contamination were divided by the reference value adopted by the RESRAD-RDD model for urban critical infrastructure. The results indicate that the information compiled is useful to support the decision-making process, although it is not sufficient to provide care and support for longer periods than those considered in the initial response phase.
- Published
- 2020
31. Seasonal variation, chemical composition and biological activity of the essential oil of Cordia verbenacea DC (Boraginaceae) and the sabinene
- Author
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Victoria Regina de Alencar Carvalho, Fernando Gomes Figueredo, João Victor de Alencar Ferreira, João Marcos Ferreira de Lima Silva, Maria Karollyna do Nascimento Silva, Erivania F. Alves, Edinardo F.F. Matias, Henrique Douglas Melo Coutinho, Jaime Ribeiro-Filho, and José Galberto Martins da Costa
- Subjects
Traditional medicine ,biology ,010405 organic chemistry ,Sabinene ,Biological activity ,Boraginaceae ,Seasonality ,medicine.disease ,biology.organism_classification ,01 natural sciences ,0104 chemical sciences ,law.invention ,Cordia verbenacea ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,chemistry ,law ,Botany ,medicine ,Antibacterial activity ,Agronomy and Crop Science ,Chemical composition ,Essential oil - Abstract
Cordia verbenacea DC (Boraginaceae), popularly known as “Erva Baleeira,” has been widely studied with respect to its chemical and pharmacological properties, and its anti-inflammatory, analgesic and anti-ulcerogenic activities have been demonstrated. The objective of this study was to determine the essential oil content with regard to time of collection of leaves and to evaluate the antibacterial activity and antibiotic-modifying activity of the oil, sabinene and sabinene hydrate against multidrug-resistant strains. GC/MS analysis showed that in samples of the essential oil obtained at different times over one year, there was qualitative and quantitative variation in chemical composition, with statistical significance (p
- Published
- 2016
32. Cobalt-catalyzed oxidative cyclization of gem -disubstituted conjugated alkenols
- Author
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Tânia M. F. Alves, Fabiana L. Pedrosa, Mateus Oliveira Costa, Marco A. B. Ferreira, and Beatriz A.D. Bispo
- Subjects
Oxidative cyclization ,010405 organic chemistry ,Aryl ,Organic Chemistry ,chemistry.chemical_element ,Oxidative phosphorylation ,Conjugated system ,010402 general chemistry ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,Catalysis ,chemistry.chemical_compound ,chemistry ,Drug Discovery ,Organic chemistry ,Reactivity (chemistry) ,Cobalt - Abstract
Aryl gem-disubstituted conjugated alkenols underwent oxidative cyclization affording 2,5,5-trisubstituted tetrahydrofurans in reasonable yields and good diastereoselectivities using the reductive termination variation of the Mukaiyama aerobic oxidative reaction. Under oxidative termination, the same alkenols produced diols and ketonic by-products via the double hydration and beta-scission competing pathways. Furthermore, the differences in alkenol reactivity under the reductive and oxidative termination conditions were investigated.
- Published
- 2016
33. Potentiation of antibiotic activity of aminoglycosides by natural products from Cordia verbenacea DC
- Author
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Cassio R. Medeiros, Celestina E.S. Souza, José Galberto Martins da Costa, Maria Karollyna do Nascimento Silva, Erivania F. Alves, Vanessa de Carvalho Nilo Bitu, Aline Augusti Boligon, Margareth Linde Athayde, Fernando Gomes Figueredo, Henrique Douglas Melo Coutinho, Francisco A. V. Santos, Edinardo F.F. Matias, and Victoria Regina de Alencar Carvalho
- Subjects
0301 basic medicine ,Staphylococcus aureus ,medicine.drug_class ,Phytochemicals ,030106 microbiology ,Antibiotics ,Ethyl acetate ,Microbial Sensitivity Tests ,medicine.disease_cause ,Microbiology ,Toxicology ,03 medical and health sciences ,Minimum inhibitory concentration ,chemistry.chemical_compound ,Escherichia coli ,medicine ,Medicinal plants ,Chromatography, High Pressure Liquid ,Biological Products ,Cordia ,Traditional medicine ,Chemistry ,Pseudomonas aeruginosa ,Drug Synergism ,Anti-Bacterial Agents ,Plant Leaves ,Aminoglycosides ,030104 developmental biology ,Infectious Diseases ,Phytochemical ,Antibacterial activity - Abstract
Medicinal plants are often the only therapeutic resource for many communities and ethnic groups. Cordia verbenacea DC., "Erva-baleeira," is one of the species of plants currently used to produce a phytotherapeutic product extracted from its leaves. The present study aimed to establish its chemical profile, antibacterial activity and resistance-modulating potential. The C. verbenacea extracts were prepared from fresh leaves using solvents as methanol and hexane. Ethyl Acetate was used for the preparation of the fraction. Phytochemical screening was carried out using HPLC-DAD for determination and quantification of the secondary metabolites present in the fractions. Antibacterial and resistance-modulation assays were performed to determine minimum inhibitory concentration (MIC) using a microdilution assay. The data were subjected to statistical analysis with two-way ANOVA and Bonferroni posttests. Results of phytochemical prospecting and HPLC analysis of the fractions were in agreement with the literature. The natural products presented moderate antibacterial activity when considering the clinical relevance of a MIC of 256 μg/mL against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, and 512 μg/mL against P. aeruginosa. However, when the fractions were combined with antibiotics we observed a synergic effect, as natural products enhanced the antibacterial effect of aminoglycosides, significantly decreasing the MIC of antibiotics at 12.5%-98.4%. We believe that the data obtained from phytochemical analysis and from antibacterial and resistance modulation assays of C. verbenacea extracts new can open perspectives in the search for new alternatives for the treatment of bacterial infections and stimulate the renewed use of antibiotics with reduced effectiveness due to resistance.
- Published
- 2016
34. Analysis of market quality before and during short-selling bans
- Author
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Victor Mendes, Carlos F. Alves, and Paulo Pereira da Silva
- Subjects
050208 finance ,Actuarial science ,05 social sciences ,Market efficiency ,Monetary economics ,Market liquidity ,Market quality ,0502 economics and business ,Economics ,Business, Management and Accounting (miscellaneous) ,050207 economics ,Volatility (finance) ,health care economics and organizations ,Finance - Abstract
We measure the impact of the August 2011 bans on covered short-selling adopted by several European countries. Our results provide evidence that the impact on prices was short-lived: the positive price impact disappears after ten days. The short-selling restrictions did not contribute to reduce the volatility of the financial stocks subjected to the bans; on the contrary, our findings indicate that volatility actually increased by a greater extent for these stocks than for other financial stocks with similar characteristics. The bans also had a negative impact on liquidity. Moreover, stocks subjected to the bans exhibit a longer delay in the assimilation of negative market news during the banning span.
- Published
- 2016
35. Financial credit analysis via a clustering weightless neural classifier
- Author
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Priscila M. V. Lima, Hugo C. C. Carneiro, Felipe M. G. França, Douglas O. Cardoso, Daniel S. F. Alves, Danilo S. Carvalho, Diego Fonseca Pereira de Souza, and Carlos E. Pedreira
- Subjects
Credit analysis ,0209 industrial biotechnology ,Artificial neural network ,Computer science ,business.industry ,Cognitive Neuroscience ,02 engineering and technology ,Machine learning ,computer.software_genre ,Computer Science Applications ,Support vector machine ,020901 industrial engineering & automation ,Artificial Intelligence ,Robustness (computer science) ,Weightless ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Artificial intelligence ,business ,Cluster analysis ,computer ,Classifier (UML) - Abstract
Credit analysis is a real-world classification problem where it is quite common to find datasets with a large amount of noisy data. State-of-the-art classifiers that employ error minimisation techniques, on the other hand, require a long time to converge, in order to achieve robustness. This paper explores ClusWiSARD, a clustering customisation of the WiSARD weightless neural network model, applied to two different credit analysis real-world problems. Experimental evidence shows that ClusWiSARD is very competitive with Support Vector Machine (SVM) w.r.t. accuracy, with the advantage of being capable of online learning. ClusWiSARD outperforms SVM in training time, by two orders of magnitude, and is slightly faster in test time.
- Published
- 2016
36. Extending SMER-based CPGs to accommodate total support phases and kinematics-safe transitions between gait rhythms of hexapod robots
- Author
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Luciano Santos Constantin Raptopoulos, Daniel S. F. Alves, W.S. Andrade, Felipe M. G. França, C.S. Carvalho, and Max Suell Dutra
- Subjects
Hexapod ,Artificial Intelligence ,Position (vector) ,Computer science ,Cognitive Neuroscience ,Work (physics) ,Robot ,Kinematics ,Swing ,Gait ,Simulation ,Computer Science Applications - Abstract
This work presents a new extension to the artificial CPGs (Central Pattern Generators) based on Scheduling by Multiple Edge Reversal (SMER) proposed by Yang and Franca. The insertion of a total support phase between each particular swing and support legs phase was produced for all different hexapod gait patterns. Thus, pseudo-synchronous gait pattern transitions are easily allowed and walking stability is potentially improved. Moreover, the insertion of such new phases facilitates to work with two distinct time periods: (i) when legs are in the typical swing-support phases, i.e., carrying the body of the robot to its future position, and (ii) during total support phases. All new extended SMER-based gait patterns are presented by means of a kinematic analysis made through simulations of a hexapod walking robot.
- Published
- 2015
37. P-137 High rectal cancer: What’s the best treatment?
- Author
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Anabela Coelho, F. Alves, M. Neves, C. Neves, Ana Carolina Junqueira Vasques, J. Barata, M. Pinto, and A. Mourão
- Subjects
medicine.medical_specialty ,Oncology ,Colorectal cancer ,business.industry ,Internal medicine ,medicine ,Hematology ,medicine.disease ,business ,Gastroenterology - Published
- 2020
38. Influence of solvent solubility parameter on the performance of EVA copolymers as pour point modifiers of waxy model-systems
- Author
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Pedro H.R. Pereira, bruna F. Alves, Elizabete F. Lucas, and Rita C. P. Nunes
- Subjects
Wax ,Molar mass ,Chemistry ,020209 energy ,General Chemical Engineering ,Pour point ,Organic Chemistry ,Energy Engineering and Power Technology ,02 engineering and technology ,Solvent ,Hildebrand solubility parameter ,chemistry.chemical_compound ,Fuel Technology ,020401 chemical engineering ,Chemical engineering ,visual_art ,0202 electrical engineering, electronic engineering, information engineering ,visual_art.visual_art_medium ,Melting point ,Naphthenic acid ,0204 chemical engineering ,Solubility - Abstract
High molar mass paraffins in the crude oil solidify with the reduction of temperature during offshore production, which can reduce production or even block outflow lines. Polymers can be used to inhibit the wax deposition. However, the efficiency of the additives depends on the type of oil and, because it is a complex mixture, this relationship still needs further investigation. The aim of this work is to evaluate the influence of different types of compounds present in petroleum on the action of poly(ethylene-vinyl acetate) as pour point reducers using model systems of paraffins in solvents. The study was carried out based on results of pour point, wax appearance temperature and polymer-solvent interaction. The results showed that only the asphaltenes (C5I and C7I) changed the pour point to lower values. The other compounds, such as naphthalene, naphthenic acid and adamantene, at the concentration used of 1 wt/v%, did not alter the melting point of the model systems or interfere with the additive action. On the other hand, by analyzing the influence of the solvent composition, it was observed that: (i) the wax solubility in the medium affected the WAT but did not affect the pour point (the higher the solubility of the paraffin in the medium, the lower the WAT is); and (ii) the solubility of the additive in the solvent medium did not affect the WAT but significantly affected the pour point (the higher the polymer-solvent interaction, the lower the pour point of the model-system containing the additive).
- Published
- 2019
39. The genus Cordia: botanists, ethno, chemical and pharmacological aspects
- Author
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José Galberto Martins da Costa, Maria Karollyna do Nascimento Silva, Victoria Regina de Alencar Carvalho, Edinardo F.F. Matias, Erivania F. Alves, and Henrique Douglas Melo Coutinho
- Subjects
Flavonoids ,Cordia ,biology ,Terpenes ,lcsh:RS1-441 ,Boraginaceae ,Phytochemical ,biology.organism_classification ,Bioactivity ,lcsh:Pharmacy and materia medica ,Pharmacology, Toxicology and Pharmaceutics(all) ,Genus ,Ethnobotany ,Botany ,Ethnopharmacology ,General Pharmacology, Toxicology and Pharmaceutics - Abstract
Species of the genus Cordia, Boraginaceae, are widely studied with regard to the various ethnobotanical and ethnopharmacological aspects. They are found principally in tropical and subtropical regions of the American, Asian and African continents, where they occur in various countries. In the genus Cordia, there are many species cultivated for ornamental plants, wood and medicinal applications, where they are extensively utilized by traditional communities. In the last decades, scientific studies of Cordia species have intensified, demonstrating the great interest in phytochemical, biological and pharmacological studies. In this review, we describe the principal botanical aspects, ethnopharmacological information and evaluation of the bioactive and pharmacological properties of Cordia, its phytochemical constituents and the most common classes of secondary metabolites identified. The information reported in this work contributes scientifically to recognizing the importance of the genus Cordia as a target in the search for new biotechnological investments. Keywords: Bioactivity, Cordia, Ethnopharmacology, Phytochemical, Flavonoids, Terpenes
- Published
- 2015
- Full Text
- View/download PDF
40. Gibbs–Markov–Young structures with (stretched) exponential tail for partially hyperbolic attractors
- Author
-
José F. Alves and Xin Li
- Subjects
Markov chain ,General Mathematics ,Attractor ,Mathematical analysis ,Tangent space ,Large deviations theory ,Exponential decay ,Invariant (mathematics) ,Riemannian manifold ,Exponential function ,Mathematics - Abstract
In this work we extend the results obtained by Gouezel in [12] to partially hyperbolic attractors. We study a forward invariant set K on a Riemannian manifold M whose tangent space splits as dominated decomposition T K M = E c u ⊕ E s , for which the center-unstable direction E c u is non-uniformly expanding on some local unstable disk. We prove that the (stretched) exponential decay of recurrence times for an induced scheme can be deduced under the assumption of (stretched) exponential decay of the time that typical points need to achieve some uniform expanding in the center-unstable direction. As an application of our results we obtain exponential decay of correlations and exponential large deviations for a class of partially hyperbolic diffeomorphisms considered in [1] .
- Published
- 2015
41. Phytochemical characterization by HPLC and evaluation of antibacterial and aminoglycoside resistance-modifying activity of chloroform fractions of Cordia verbenacea DC leaf extracts
- Author
-
Henrique Douglas Melo Coutinho, Erivania F. Alves, Cassio R. Medeiros, Edinardo F.F. Matias, José Galberto Martins da Costa, Celestina Elba Sobra de Souza, Victoria Regina de Alencar Carvalho, Irwin Rose Alencar de Menezes, Luciene Ferreira de Lima, Maria Karollyna do Nascimento Silva, Fernando Gomes Figueredo, João Victor de Alencar Ferreira, Vanessa de Carvalho Nilo Bitu, and Francisco A. V. Santos
- Subjects
Chloroform ,Traditional medicine ,biology ,medicine.drug_class ,Pseudomonas aeruginosa ,Antibiotics ,Boraginaceae ,medicine.disease_cause ,biology.organism_classification ,High-performance liquid chromatography ,Microbiology ,chemistry.chemical_compound ,Complementary and alternative medicine ,chemistry ,Phytochemical ,Staphylococcus aureus ,medicine ,Antibacterial activity - Abstract
Introduction “Erva-baleeira,” Cordia verbenacea DC. (Boraginaceae), is one of the species of plants currently exploited for the purpose of producing a phytotherapeutic product, which is extracted from the leaves. Methods Extracts of C. verbenacea were prepared from fresh leaves, and chloroform fractions were obtained from the different extracts for evaluation. Phytochemical screening was performed and the phytochemicals were quantified by HPLC-DAD. The microdilution assay was used to determine antibiotic and aminoglycoside-modifying activities (2.4–2500 μg/mL), and the results were analyzed using two-way ANOVA and Bonferroni post-test. Results Phytochemical screening and HPLC analysis of the fractions were in agreement with the literature, which describes the presence of several tannins and flavonoids in C. verbenacea leaves. The fractions showed moderate antibacterial activity when considering clinical relevance with a MIC of 128 μg/mL against a resistant strain of Staphylococcus aureus and 512 μg/mL against a resistant strain of Pseudomonas aeruginosa. However, when they were combined with antibiotics, synergism was observed, significantly lowering the MIC of the antibiotics by 12.5 (P Conclusions Our results indicated that the fractions of C. verbenacea, when combined with an antibiotic, demonstrated significant synergistic activity. Due the extensive use and sale of products derived from C. verbenacea may exert pressure on the populations of this species. The development of management plans for rational and sustainable use of the species and more studies with emphasis on the use of such fractions in the treatment of other diseases are necessary.
- Published
- 2015
42. Expression of IFN-γ, TNF-α, IL-10 and TGF-β in lymph nodes associates with parasite load and clinical form of disease in dogs naturally infected with Leishmania (Leishmania) chagasi
- Author
-
Raul Rio Ribeiro, Oscar Bruna-Romero, Marilene Suzan Marques Michalick, Eliane Perlatto Moura, Maria Norma Melo, Mauro M. Teixeira, Evanguedes Kalapothakis, Cíntia F. Alves, C. F. Alves, Izabela Ferreira Gontijo de Amorim, and Wagner Luiz Tafuri
- Subjects
Male ,Immunology ,Parasite load ,Asymptomatic ,Statistics, Nonparametric ,Dogs ,Zoonoses ,medicine ,Animals ,Parasite hosting ,Dog Diseases ,RNA, Messenger ,Leishmania ,General Veterinary ,biology ,Reverse Transcriptase Polymerase Chain Reaction ,Leishmaniasis ,Leishmania chagasi ,DNA, Protozoan ,medicine.disease ,biology.organism_classification ,Immunohistochemistry ,Visceral leishmaniasis ,Immunoglobulin G ,Cytokines ,Leishmaniasis, Visceral ,Lymph Nodes ,Lymph ,medicine.symptom - Abstract
American visceral leishmaniasis is a zoonosis of the New World. Dogs are the main reservoir of the disease and there is much interest in the understanding of mechanisms implicated in protection against canine infection. Nevertheless, most studies in dogs have not been carried out in organs that are targets of infection. This work is first to report the profile of cytokines and parasite burdens, as determined by real-time PCR, in the lymph nodes of dogs naturally infected with Leishmania chagasi. With this purpose, 18 mongrel dogs were divided in three groups: control non-infected dogs (n=6) and naturally infected animals with L. chagasi, asymptomatic (n=6) and symptomatic (n=6). Parasite burden in lymph nodes was 73-fold greater in symptomatic than asymptomatic animals. Prescapular lymph nodes of asymptomatic dogs had the highest expression of IFN-gamma and TNF-alpha and low parasite burden, indicating that these cytokines play a role in protection against infection. Highest expression of IL-10 and TGF-beta and high parasite burden were observed in symptomatic dogs, suggesting a role for these cytokines in the progression of disease. Hence, the balance of expression of IFN-gamma and TNF-alpha (protective) and IL-10 and TGF-beta (disease progression) in lymph nodes determine parasite burden and clinical expression in naturally infected dogs.
- Published
- 2009
43. Association between drugs and herbal products: In vitro enhancement of the antibiotic activity by fractions from leaves of Croton campestris A. (Euphorbiaceae)
- Author
-
Henrique Douglas Melo Coutinho, Edinardo F.F. Matias, Anne Karyzia Lima Santos de Lavor, Fernando Gomes Figueredo, Liscássia B. B Alencar, Jacqueline Cosmo Andrade, Dara Isabel Vieira de Brito, Nadghia Figueiredo Leite, Celestina E. Sobral-Souza, Rosimeire S. Albuquerque, Luciene Ferreira de Lima, Erivania F. Alves, and Beatriz Sousa Santos
- Subjects
biology ,Chemistry ,Neomycin ,biology.organism_classification ,medicine.disease_cause ,Croton ,Microbiology ,Minimum inhibitory concentration ,Complementary and alternative medicine ,Amikacin ,Staphylococcus aureus ,medicine ,Gentamicin ,Antibacterial activity ,Antagonism ,medicine.drug - Abstract
Introduction The objective of this study was to evaluate the antibacterial activity of methanol (MFEECC) and ethyl acetate (AFEECC) fractions, obtained from the ethanol extract of Croton campestris A. leaves. Methods Antibacterial and modulating activity (on bacterial resistance) was determined by micro dilution method to identify the MIC (Minimum Inhibitory Concentration), performed in triplicate and statistical significance tested by ANOVA (two-way) with Bonferroni post hoc test ( p Results In the antibacterial activity tests the fractions showed a MIC of ≥1024 μg/mL. In regards to modulation of bacterial resistance, MFEECC showed synergism when combined with antibiotic against bacterial strains. In the modulation tests, AFEECC potentiated the effects of amikacin against Staphylococcus aureus and Pseudomonas aeruginosa but had an antagonistic effect against Escherichia coli . AFEECC combined with gentamicin displayed antagonism against S. aureus and E. coli and an antagonistic effect against P. aeruginosa. When AFEECC was combined with Neomycin it resulted in antagonism against P. aeruginosa but did not affect S. aureus and E. coli . Conclusions The results indicate that the extracts and fractions obtained from C. campestris leaves could represent an alternative source of natural products capable of modifying and interfering with bacterial resistance to aminoglycosides.
- Published
- 2014
44. Innate Host Defense Requires TFEB-Mediated Transcription of Cytoprotective and Antimicrobial Genes
- Author
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Amanda C. Wollenberg, Anna-Maria F. Alves, Lyly G. Luhachack, Gary D. Stormo, Lynda M. Stuart, Javier E. Irazoqui, Orane Visvikis, Sid Ahmed Labed, and Nnamdi Ihuegbu
- Subjects
Transcriptional Activation ,Staphylococcus aureus ,animal diseases ,Immunology ,Basic helix-loop-helix leucine zipper transcription factors ,chemical and pharmacologic phenomena ,Article ,Proinflammatory cytokine ,Microbiology ,03 medical and health sciences ,Mice ,0302 clinical medicine ,Transcription (biology) ,RNA interference ,Autophagy ,Enterococcus faecalis ,Basic Helix-Loop-Helix Transcription Factors ,Animals ,Immunology and Allergy ,Pseudomonas Infections ,RNA, Small Interfering ,Caenorhabditis elegans ,Caenorhabditis elegans Proteins ,Transcription factor ,030304 developmental biology ,0303 health sciences ,biology ,Basic Helix-Loop-Helix Leucine Zipper Transcription Factors ,Macrophages ,Salmonella enterica ,biochemical phenomena, metabolism, and nutrition ,Staphylococcal Infections ,biology.organism_classification ,Immunity, Innate ,3. Good health ,Infectious Diseases ,Pseudomonas aeruginosa ,Salmonella Infections ,TFEB ,bacteria ,RNA Interference ,030217 neurology & neurosurgery ,Signal Transduction - Abstract
SummaryAnimal host defense against infection requires the expression of defense genes at the right place and the right time. Understanding such tight control of host defense requires the elucidation of the transcription factors involved. By using an unbiased approach in the model Caenorhabditis elegans, we discovered that HLH-30 (known as TFEB in mammals) is a key transcription factor for host defense. HLH-30 was activated shortly after Staphylococcus aureus infection, and drove the expression of close to 80% of the host response, including antimicrobial and autophagy genes that were essential for host tolerance of infection. TFEB was also rapidly activated in murine macrophages upon S. aureus infection and was required for proper transcriptional induction of several proinflammatory cytokines and chemokines. Thus, our data suggest that TFEB is a previously unappreciated, evolutionarily ancient transcription factor in the host response to infection.
- Published
- 2014
- Full Text
- View/download PDF
45. FLOT versus ECF/ECX peri-operative regimens in real life setting for patients with resectable gastric adenocarcinoma
- Author
-
J. Barata, João Graça, M. Pinto, A. Matos, F. Alves, D. Alberca, P. Chitonho, M. Neves, and André F. T. Martins
- Subjects
medicine.medical_specialty ,Gastric adenocarcinoma ,Oncology ,business.industry ,Internal medicine ,Medicine ,In real life ,Hematology ,Perioperative ,business ,Gastroenterology - Published
- 2019
46. Gemcitabine-based chemotherapy after FOLFIRINOX: a Portuguese retrospective multicenter analysis
- Author
-
João Graça, M. Pinto, M. Vitorino, I.F. Eiriz, J. Barata, M. Neves, André F. T. Martins, F. Alves, Anabela Coelho, G. Nogueira-Costa, and A. Matos
- Subjects
Oncology ,medicine.medical_specialty ,Chemotherapy ,FOLFIRINOX ,business.industry ,medicine.medical_treatment ,Hematology ,Gemcitabine ,language.human_language ,Internal medicine ,medicine ,language ,Portuguese ,business ,medicine.drug - Published
- 2019
47. PCN2 - EFFECTIVENESS AND SAFETY OF PEMBROLIZUMAB IN ADVANCED OR METASTATIC MELANOMA: PRELIMINARY RESULTS FROM REAL WORLD
- Author
-
M.A. Ferreira, F. Alves da Costa, Ana Isabel Miranda, Paula Soares, Rodrigo Murteira, F. Cardoso Borges, Catarina Ramos, and Claudia Furtado
- Subjects
Oncology ,medicine.medical_specialty ,Metastatic melanoma ,business.industry ,Health Policy ,Internal medicine ,Public Health, Environmental and Occupational Health ,medicine ,Pembrolizumab ,business - Published
- 2018
48. PCN4 - EFFECTIVENESS AND SAFETY OF PEMBROLIZUMAB IN ADVANCED OR METASTATIC NON-SMALL CELL LUNG CANCER
- Author
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F. Alves da Costa, F. Cardoso Borges, Catarina Ramos, Rodrigo Murteira, Ana Isabel Miranda, and Matheus Martins Ferreira
- Subjects
Oncology ,medicine.medical_specialty ,business.industry ,Health Policy ,Internal medicine ,Public Health, Environmental and Occupational Health ,medicine ,Non small cell ,Pembrolizumab ,Lung cancer ,medicine.disease ,business - Published
- 2018
49. High content cell monitoring of cancer and cancer treatment-related cardiomyopathy
- Author
-
Krisztina Juhasz, F. Alves, L. Doer, Niels Fertig, Sonja Stölzle-Feix, O. Reinhardt, Elena Dragicevic, and Matthias Beckler
- Subjects
Oncology ,medicine.medical_specialty ,business.industry ,Cell ,Cardiomyopathy ,Cancer ,General Medicine ,Toxicology ,medicine.disease ,Cancer treatment ,medicine.anatomical_structure ,Internal medicine ,medicine ,business - Published
- 2018
50. PCN246 - EVOLUTION OF ONCOLYTICS CONSUMPTION IN PORTUGAL OVER TEN YEARS
- Author
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Claudia Furtado, F. Alves da Costa, Catarina Ramos, and António Moreira
- Subjects
Consumption (economics) ,Geography ,Health Policy ,Public Health, Environmental and Occupational Health ,Agricultural economics - Published
- 2018
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