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da Silva KC, Brum M, Oliveira RS, Barbosa BV, Negrão-Rodrigues V, Teodoro GS. High resilience of campos rupestres plants to the interaction of drought and fire. Plant Biol (Stuttg) 2023. [PMID: 38059684 DOI: 10.1111/plb.13596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 11/01/2023] [Indexed: 12/08/2023]
Abstract
The concurrent impacts of multiple disturbances have the potential to modify ecosystem functioning by diminishing recovery capacity and resilience. Nevertheless, it remains uncertain how plant species from tropical communities respond to the cumulative effects of drought and fire. In this study, we evaluated the responses of six plant species from campos rupestres subjected to a mild drought followed by fire and tested if plants subjected to simulated drought show reductions in carbon uptake and depletion of non-structural carbohydrate (NSC) reserves, thus constraining their resprouting. We monitored monthly variations in leaf gas exchange and aboveground biomass over 18 months. Subsequently, an accidental fire occurred in the study area, leading us to collect samples of belowground structures for NSC analyses on the day of the burn. There were no differences in the frequency of resprouting between the above two conditions. Additionally, gas exchange in most species either remained stable or increased after the fire. Drought had no adverse effects on NSC reserves in the belowground structures and may have contributed to species resprouting after fire. The impact of drought pre-conditions on post-fire aboveground biomass was generally minor for most species, except Vellozia nivea, which displayed roughly a 5% reduction in biomass following the drought. Our findings highlight the remarkable resilience of campos rupestres species, even after enduring 18 months of reduced water availability and an unintended fire event. These species demonstrated the capacity to maintain their physiological functions and resprouting capacities after a fire event, underscoring their strong recovery potential.
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Affiliation(s)
- K C da Silva
- Programa de Pós-graduação em Ecologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil
| | - M Brum
- Programa de Pós-graduação em Ecologia, Institute of Biology, University of Campinas - UNICAMP, Campinas, São Paulo, Brazil
| | - R S Oliveira
- Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil
| | - B V Barbosa
- Programa de Pós-graduação em Ecologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil
| | - V Negrão-Rodrigues
- Programa de Pós-Graduação em Botânica Tropical, Universidade Federal Rural da Amazônia, Museu Paraense Emílio Goeldi, Belém, Pará, Brazil
| | - G S Teodoro
- Programa de Pós-graduação em Biologia Vegetal, Institute of Biology, University of Campinas - UNICAMP, Campinas, São Paulo, Brazil
- Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Pará, Brazil
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Paligi SS, Link RM, Isasa E, Bittencourt P, Cabral JS, Jansen S, Oliveira RS, Pereira L, Schuldt B. Assessing the agreement between the pneumatic and the flow-centrifuge method for estimating xylem safety in temperate diffuse-porous tree species. Plant Biol (Stuttg) 2023; 25:1171-1185. [PMID: 37703535 DOI: 10.1111/plb.13573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 07/06/2023] [Indexed: 09/15/2023]
Abstract
The increasing frequency of global change-type droughts has created a need for fast, accurate and widely applicable techniques for estimating xylem embolism resistance to improve forecasts of future forest changes. We used data from 12 diffuse-porous temperate tree species covering a wide range of xylem safety to compare the pneumatic and flow-centrifuge method, two rapid methods used for constructing xylem vulnerability curves. We evaluated the agreement between parameters estimated with both methods and the sensitivity of pneumatic measurements to the duration of air discharge (AD) measurements. There was close agreement between xylem water potentials at 50% air discharged (PAD), estimated with the Pneumatron, and 50% loss of hydraulic conductivity (PLC), estimated with the flow-centrifuge method (mean signed deviation: 0.12 MPa, Pearson correlation: 0.96 after 15 s of gas extraction). However, the relationship between the estimated slopes was more variable, resulting in lower agreement in the xylem water potential at 12% and 88% PAD/PLC. The agreement between the two methods was not affected by species-specific vessel length distributions. All pneumatic parameters were sensitive to AD time. Overall agreement was highest at relatively short AD times, with an optimum at 16 s. Our results highlight the value of the Pneumatron as an easy and reliable tool to estimate 50% embolism thresholds for a wide range of diffuse-porous temperate angiosperms. Further, our study provides a set of useful metrics for methodological comparisons of vulnerability curves in terms of systematic and random deviations, as well as overall agreement.
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Affiliation(s)
- S S Paligi
- Chair of Ecophysiology and Vegetation Ecology, Julius-von-Sachs Institute of Biological Sciences, University of Würzburg, Würzburg, Germany
| | - R M Link
- Chair of Ecophysiology and Vegetation Ecology, Julius-von-Sachs Institute of Biological Sciences, University of Würzburg, Würzburg, Germany
- Chair of Forest Botany, Institute of Forest Botany and Forest Zoology, Technische Universität Dresden, Tharandt, Germany
| | - E Isasa
- Chair of Ecophysiology and Vegetation Ecology, Julius-von-Sachs Institute of Biological Sciences, University of Würzburg, Würzburg, Germany
| | - P Bittencourt
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - J S Cabral
- Ecosystem Modeling Group, Center for Computational and Theoretical Biology, University of Würzburg, Würzburg, Germany
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
| | - S Jansen
- Institute of Botany, Ulm University, Ulm, Germany
| | - R S Oliveira
- Department of Plant Biology, Instituto de Biologia, University of Campinas, Campinas, SP, Brazil
| | - L Pereira
- Institute of Botany, Ulm University, Ulm, Germany
| | - B Schuldt
- Chair of Ecophysiology and Vegetation Ecology, Julius-von-Sachs Institute of Biological Sciences, University of Würzburg, Würzburg, Germany
- Chair of Forest Botany, Institute of Forest Botany and Forest Zoology, Technische Universität Dresden, Tharandt, Germany
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DaSilva J, Decristoforo C, Mach RH, Bormans G, Carlucci G, Al-Qahtani M, Duatti A, Gee AD, Szymanski W, Rubow S, Hendrikx J, Yang X, Jia H, Zhang J, Caravan P, Yang H, Zeevaart JR, Rodriquez MA, Oliveira RS, Zubillaga M, Sakr T, Spreckelmeyer S. Highlight selection of radiochemistry and radiopharmacy developments by editorial board. EJNMMI Radiopharm Chem 2023; 8:35. [PMID: 37889361 PMCID: PMC10611660 DOI: 10.1186/s41181-023-00218-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 10/13/2023] [Indexed: 10/28/2023] Open
Abstract
BACKGROUND The Editorial Board of EJNMMI Radiopharmacy and Chemistry releases a biannual highlight commentary to update the readership on trends in the field of radiopharmaceutical development. MAIN BODY This selection of highlights provides commentary on 21 different topics selected by each coauthoring Editorial Board member addressing a variety of aspects ranging from novel radiochemistry to first-in-human application of novel radiopharmaceuticals. CONCLUSION Trends in radiochemistry and radiopharmacy are highlighted. Hot topics cover the entire scope of EJNMMI Radiopharmacy and Chemistry, demonstrating the progress in the research field in many aspects.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Xing Yang
- Peking University First Hospital, Beijing, China
| | | | | | - Peter Caravan
- Massuchusetts General Hospital, Harvard University, Boston, USA
| | | | | | | | - Ralph Santos Oliveira
- Brazilian Association of Radiopharmacy Brazil, Brazilian Nuclear Energy Commission - Nuclear Engineering Institute, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Tamer Sakr
- Egyptian Atomic Energy Authority, Cairo, Egypt
| | - Sarah Spreckelmeyer
- Department of Nuclear Medicine, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität Zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1, 13353, Berlin, Germany.
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Barros FDV, Lewis K, Robertson AD, Pennington RT, Hill TC, Matthews C, Lira-Martins D, Mazzochini GG, Oliveira RS, Rowland L. Cost-effective restoration for carbon sequestration across Brazil's biomes. Sci Total Environ 2023; 876:162600. [PMID: 36871717 DOI: 10.1016/j.scitotenv.2023.162600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
Tropical ecosystems are central to the global focus on halting and reversing habitat destruction as a means of mitigating carbon emissions. Brazil has been highlighted as a vital part of global climate agreements because, whilst ongoing land-use change causes it to be the world's fifth biggest greenhouse gas emitting country, it also has one of the greatest potentials to implement ecosystem restoration. Global carbon markets provide the opportunity of a financially viable way to implement restoration projects at scale. However, except for rainforests, the restoration potential of many major tropical biomes is not widely recognised, with the result that carbon sequestration potential may be squandered. We synthesize data on land availability, land degradation status, restoration costs, area of native vegetation remaining, carbon storage potential and carbon market prices for 5475 municipalities across Brazil's major biomes, including the savannas and tropical dry forests. Using a modelling analysis, we determine how fast restoration could be implemented across these biomes within existing carbon markets. We argue that even with a sole focus on carbon, we must restore other tropical biomes, as well as rainforests, to effectively increase benefits. The inclusion of dry forests and savannas doubles the area which could be restored in a financially viable manner, increasing the potential CO2e sequestered >40 % above that offered by rainforests alone. Importantly, we show that in the short-term avoiding emissions through conservation will be necessary for Brazil to achieve it's 2030 climate goal, because it can sequester 1.5 to 4.3 Pg of CO2e by 2030, relative to 0.127 Pg CO2e from restoration. However, in the longer term, restoration across all biomes in Brazil could draw down between 3.9 and 9.8 Pg of CO2e from the atmosphere by 2050 and 2080.
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Affiliation(s)
- F de V Barros
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK.
| | - K Lewis
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - A D Robertson
- Department of Soil and Crop Sciences Colorado State University, Fort Collins, CO 80523, USA; Natural Resources Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA
| | - R T Pennington
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK; Royal Botanic Garden Edinburgh, Edinburgh EH3 5LR, UK
| | - T C Hill
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - C Matthews
- Independent Research, 3 Cultins Rd, Edinburgh EH11 4DF, UK
| | - D Lira-Martins
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP 13083-970, Brazil
| | - G G Mazzochini
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP 13083-970, Brazil
| | - R S Oliveira
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP 13083-970, Brazil
| | - L Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
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5
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Giles AL, Rowland L, Bittencourt PRL, Bartholomew DC, Coughlin I, Costa PB, Domingues T, Miatto RC, Barros FV, Ferreira LV, Groenendijk P, Oliveira AAR, da Costa ACL, Meir P, Mencuccini M, Oliveira RS. Small understorey trees have greater capacity than canopy trees to adjust hydraulic traits following prolonged experimental drought in a tropical forest. Tree Physiol 2022; 42:537-556. [PMID: 34508606 DOI: 10.1093/treephys/tpab121] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Future climate change predictions for tropical forests highlight increased frequency and intensity of extreme drought events. However, it remains unclear whether large and small trees have differential strategies to tolerate drought due to the different niches they occupy. The future of tropical forests is ultimately dependent on the capacity of small trees (<10 cm in diameter) to adjust their hydraulic system to tolerate drought. To address this question, we evaluated whether the drought tolerance of neotropical small trees can adjust to experimental water stress and was different from tall trees. We measured multiple drought resistance-related hydraulic traits across nine common neotropical genera at the world's longest-running tropical forest throughfall-exclusion experiment and compared their responses with surviving large canopy trees. Small understorey trees in both the control and the throughfall-exclusion treatment had lower minimum stomatal conductance and maximum hydraulic leaf-specific conductivity relative to large trees of the same genera, as well as a greater hydraulic safety margin (HSM), percentage loss of conductivity and embolism resistance, demonstrating that they occupy a distinct hydraulic niche. Surprisingly, in response to the drought treatment, small trees increased specific hydraulic conductivity by 56.3% and leaf:sapwood area ratio by 45.6%. The greater HSM of small understorey trees relative to large canopy trees likely enabled them to adjust other aspects of their hydraulic systems to increase hydraulic conductivity and take advantage of increases in light availability in the understorey resulting from the drought-induced mortality of canopy trees. Our results demonstrate that differences in hydraulic strategies between small understorey and large canopy trees drive hydraulic niche segregation. Small understorey trees can adjust their hydraulic systems in response to changes in water and light availability, indicating that natural regeneration of tropical forests following long-term drought may be possible.
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Affiliation(s)
- A L Giles
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
| | - L Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - P R L Bittencourt
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - D C Bartholomew
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - I Coughlin
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Av. Bandeirantes, 3900 - Vila Monte Alegre, Ribeirão Preto SP 14040-900, Brazil
- Research School of Biology, Australian National University, 134 Linnaeus Way, Canberra ACT 2601, Australia
| | - P B Costa
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
- Biological Sciences, Stirling Highway, Perth, WA 6009, Australia
| | - T Domingues
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Av. Bandeirantes, 3900 - Vila Monte Alegre, Ribeirão Preto SP 14040-900, Brazil
| | - R C Miatto
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Av. Bandeirantes, 3900 - Vila Monte Alegre, Ribeirão Preto SP 14040-900, Brazil
| | - F V Barros
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - L V Ferreira
- Museu Paraense Emílio Goeldi, Av. Gov Magalhães Barata, 376 - São Brás, Belém PA 66040-170, Brazil
| | - P Groenendijk
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
| | - A A R Oliveira
- Museu Paraense Emílio Goeldi, Av. Gov Magalhães Barata, 376 - São Brás, Belém PA 66040-170, Brazil
| | - A C L da Costa
- Museu Paraense Emílio Goeldi, Av. Gov Magalhães Barata, 376 - São Brás, Belém PA 66040-170, Brazil
- Biological Sciences, Stirling Highway, Perth, WA 6009, Australia
| | - P Meir
- Research School of Biology, Australian National University, 134 Linnaeus Way, Canberra ACT 2601, Australia
- School of GeoSciences, University of Edinburgh, Drummond St Edinburgh EH9 3FF, UK
| | - M Mencuccini
- CREAF, Campus UAB, Edifici C Campus de Bellaterra Cerdanyola del Vallés 08193, Spain
- ICREA, Passeig de Lluís Companys, 23, Barcelona 08010, Spain
| | - R S Oliveira
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
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Oliveira RS, Pimentel KBA, Moura ML, Aragão CF, Guimarães-E-Silva AS, Bezerra JMT, Melo MN, Pinheiro VCS. Clinical, epidemiological and climatic factors related to the occurrence of cutaneous leishmaniasis in an endemic area in northeastern Brazil. BRAZ J BIOL 2021; 81:557-565. [PMID: 32876165 DOI: 10.1590/1519-6984.224937] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 02/26/2020] [Indexed: 01/19/2023] Open
Abstract
Cutaneous leishmaniasis (CL) is a neglected tropical disease with a wide distribution in the Americas. Brazil is an endemic country and present cases in all states. This study aimed to describe the occurrence, the underlying clinical and epidemiological factors, and the correlation of climatic variables with the frequency of reported CL cases in the municipality of Caxias, state of Maranhão, Brazil. This is a retrospective and descriptive epidemiological study based on data extracted from the Brazilian Information System of Diseases Notification, from 2007 to 2017. Maximum and minimum temperature, precipitation, and relative air humidity data were provided by the Brazilian National Institute of Meteorology. A total of 201 reported autochthonous CL cases were analyzed. The predominance of cases was observed in males (70.1%). The age range between 31 and 60 years old was the most affected, with 96 cases (47.9%). Of the total number of registered cases, 38.8% of the affected individuals were engaged in agriculture-related activities. The georeferenced distribution revealed the heterogeneity of disease occurrence, with cases concentrated in the Western and Southern regions of the municipality. An association was detected between relative air humidity (monthly mean) and the number of CL cases per month (p = 0.04). CL continues to be a concerning public health issue in Caxias. In this context, there is a pressing need to strengthen measures of prevention and control of the disease through the network of health services of the municipality, considering local and regional particularities.
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Affiliation(s)
- R S Oliveira
- Curso de Medicina, Departamento de Ciências da Saúde, Universidade Estadual do Maranhão - UEMA, Campus Caxias - Anexo Saúde, Rua Quinhinha Pires, 746, Centro, CEP 65602-050, Caxias, MA, Brasil
| | - K B A Pimentel
- Programa de Pós-graduação Strictu Sensu em Saúde e Ambiente, Universidade Federal do Maranhão - UFMA, Praça Madre Deus, 02, Madre Deus, CEP 65025-560, São Luís, MA, Brasil
| | - M L Moura
- Curso de Medicina, Departamento de Ciências da Saúde, Universidade Estadual do Maranhão - UEMA, Campus Caxias - Anexo Saúde, Rua Quinhinha Pires, 746, Centro, CEP 65602-050, Caxias, MA, Brasil
| | - C F Aragão
- Programa de Pós-graduação Strictu Sensu em Virologia, Instituto Evandro Chagas - IEC, Rodovia BR 316, Km 07, s/n, Levilândia, CEP 67030-000, Ananideua, PA, Brasil
| | - A S Guimarães-E-Silva
- Programa de Pós-graduação Strictu Sensu em Biodiversidade, Ambiente e Saúde, Laboratório de Entomologia Médica, Universidade Estadual do Maranhão - UEMA, Campus Caxias, Praça Duque de Caxias, s/n, Morro do Alecrim, CEP 65604-380, Caxias, MA, Brasil
| | - J M T Bezerra
- Curso de Ciências Biológicas, Universidade Estadual do Maranhão - UEMA, Campus Lago da Pedra, Avenida Roseana Sarney, s/n, Vila Rocha, CEP 65715-000, Lago da Pedra, MA, Brasil
| | - M N Melo
- Laboratório de Biologia de Leishmania, Departamento de Parasitologia, Universidade Federal de Minas Gerais - UFMG, Av. Presidente Antônio Carlos, 6627, Pampulha, CEP 31270-901, Belo Horizonte, MG, Brasil
| | - V C S Pinheiro
- Programa de Pós-graduação Strictu Sensu em Biodiversidade, Ambiente e Saúde, Laboratório de Entomologia Médica, Universidade Estadual do Maranhão - UEMA, Campus Caxias, Praça Duque de Caxias, s/n, Morro do Alecrim, CEP 65604-380, Caxias, MA, Brasil
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Pouranbarani E, Berg LA, Oliveira RS, Dos Santos RW, Nygren A. Improved Accuracy of Cardiac Tissue-Level Simulations by Considering Membrane Resistance as a Cellular-Level Optimization Objective. Annu Int Conf IEEE Eng Med Biol Soc 2020; 2020:2487-2490. [PMID: 33018511 DOI: 10.1109/embc44109.2020.9176128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cardiac cellular models are utilized as the building blocks for tissue simulation. One of the imprecisions of conventional cellular modeling, especially when the models are used in tissue-level modeling, stems from the mere consideration of cellular properties (e.g., action potential shape) in parameter tuning of the model. In our previous work, we put forward an accurate framework in which membrane resistance (Rm) reflecting inter-cellular characteristics, i.e., electrotonic effects, was considered alongside cellular features in cellular model fitting. This paper, for the first time, examines the hypothesis that considering Rm as an additional optimization objective improves the accuracy of tissue-level modeling. To study this hypothesis, after cellular-level optimization of a well-known model, source-sink mismatch configurations in a 2-dimensional model are investigated. The results demonstrate that including Rm in the optimization protocol yields a substantial improvement in the relative error of the critical transition border which is defined as the minimum window size between source and sink that wave propagates. Model developers can utilize the proposed concept during parameter tuning to increase the accuracy of models.
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8
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Holanda AER, Souza BC, Carvalho ECD, Oliveira RS, Martins FR, Muniz CR, Costa RC, Soares AA. How do leaf wetting events affect gas exchange and leaf lifespan of plants from seasonally dry tropical vegetation? Plant Biol (Stuttg) 2019; 21:1097-1109. [PMID: 31251437 DOI: 10.1111/plb.13023] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 06/25/2019] [Indexed: 06/09/2023]
Abstract
Foliar uptake of dew is likely an important mechanism of water acquisition for plants from tropical dry environments. However, there is still limited experimental evidence describing the anatomical pathways involved in this process and the effects of this water subsidy on the maintenance of gas exchange and leaf lifespan of species from seasonally dry tropical vegetation such as the Brazilian caatinga. We performed scanning electron, bright-field and confocal microscopic analyses and used apoplastic tracers to examine the foliar water uptake (FWU) routes in four woody species with different foliar phenology and widely distributed in the caatinga. Leaves of plants subjected to water stress were exposed to dew simulation to evaluate the effects of the FWU on leaf water potentials, gas exchange and leaf lifespan. All species absorbed water through their leaf cuticles and/or peltate trichomes but FWU capacity differed among species. Leaf wetting by dew increased leaf lifespan duration up to 36 days compared to plants in the drought treatment. A positive effect on leaf gas exchange and new leaf production was only observed in the anisohydric and evergreen species. We showed that leaf wetting by dew is relevant for the physiology and leaf lifespan of plants from seasonally dry tropical vegetation, especially for evergreen species.
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Affiliation(s)
- A E R Holanda
- Graduate Program in Ecology and Natural Resources, Department of Biology, Federal University of Ceará, Fortaleza, Brazil
| | - B C Souza
- Graduate Program in Ecology and Natural Resources, Department of Biology, Federal University of Ceará, Fortaleza, Brazil
| | - E C D Carvalho
- Graduate Program in Ecology and Natural Resources, Department of Biology, Federal University of Ceará, Fortaleza, Brazil
| | - R S Oliveira
- Department of Plant Biology, Institute of Biology, University of Campinas - UNICAMP, Campinas, Brazil
| | - F R Martins
- Department of Plant Biology, Institute of Biology, University of Campinas - UNICAMP, Campinas, Brazil
| | - C R Muniz
- Embrapa Tropical Agroindustry, Fortaleza, Brazil
| | - R C Costa
- Department of Biology, Federal University of Ceará, Fortaleza, Brazil
| | - A A Soares
- Department of Biology, Federal University of Ceará, Fortaleza, Brazil
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9
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De Leo TC, Nascimento Dos Santos S, Del Cistia Andrade C, Ricci E, Turato WM, Lopes NP, Oliveira RS, Bernardes ES, Dias-Baruffi M. Engineering of galectin-3 for glycan-binding optical imaging. Biochem Biophys Res Commun 2019; 521:674-680. [PMID: 31685208 DOI: 10.1016/j.bbrc.2019.10.161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Accepted: 10/22/2019] [Indexed: 12/17/2022]
Abstract
Galectin-3 (Gal-3) is a multifunctional glycan-binding protein that participates in many pathophysiological events and has been described as a biomarker and potential therapeutic target for severe disorders, such as cancer. Several probes for Gal-3 or its ligands have been developed, however both the pathophysiological mechanisms and potential biomedical applications of Gal-3 remain not fully assessed. Molecular imaging using bioluminescent probes provides great sensitivity for in vivo and in vitro analysis for both cellular and whole multicellular organism tracking and target detection. Here, we engineered a chimeric molecule consisting of Renilla luciferase fused with mouse Gal-3 (RLuc-mGal-3). RLuc-mGal-3 preparation was highly homogenous, soluble, active, and has molecular mass of 65,870.95 Da. This molecule was able to bind to MKN45 cell surface, property which was inhibited by the reduction of Gal-3 ligands on the cell surface by the overexpression of ST6GalNAc-I. In order to obtain an efficient and stable delivery system, RLuc-mGal-3 was adsorbed to poly-lactic acid nanoparticles, which increased binding to MKN45 cells in vitro. Furthermore, bioluminescence imaging showed that RLuc-mGal-3 was able to indicate the presence of implanted tumor in mice, event drastically inhibited by the presence of lactose. This novel bioluminescent chimeric molecule offers a safe and highly sensitive alternative to fluorescent and radiolabeled probes with potential application in biomedical research for a better understanding of the distribution and fate of Gal-3 and its ligands in vitro and in vivo.
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Affiliation(s)
- Thais Canassa De Leo
- School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Av. Cafe S/N, CEP 14040-903, Ribeirao Preto, SP, Brazil
| | | | - Camillo Del Cistia Andrade
- School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Av. Cafe S/N, CEP 14040-903, Ribeirao Preto, SP, Brazil
| | - Eduardo Ricci
- Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Walter Miguel Turato
- Department of Clinical and Toxicological Analyses, Faculty of Pharmaceutical Sciences, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Norberto Peporine Lopes
- School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Av. Cafe S/N, CEP 14040-903, Ribeirao Preto, SP, Brazil
| | | | | | - Marcelo Dias-Baruffi
- School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Av. Cafe S/N, CEP 14040-903, Ribeirao Preto, SP, Brazil.
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Moraes OS, Cardoso BF, Pacheco TA, Pinto AZL, Carvalho MS, Hahn RC, Burlamaqui TCT, Oliveira LF, Oliveira RS, Vasconcelos JM, Lemos PS, Nunes MRT, Slhessarenko RD. Natural infection by Culex flavivirus in Culex quinquefasciatus mosquitoes captured in Cuiabá, Mato Grosso Mid-Western Brazil. Med Vet Entomol 2019; 33:397-406. [PMID: 30887540 DOI: 10.1111/mve.12374] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 02/19/2019] [Accepted: 02/27/2019] [Indexed: 06/09/2023]
Abstract
New species of insect-specific viruses (ISV) have been reported worldwide. In the present study, the complete genome of Culex flavivirus (CxFV) and partial sequences of other ISVs in Culex quinquefasciatus Say 1823 females (n = 3425) sampled in 200 urban areas census tracts of Cuiaba, state of Mato Grosso, were identified via reverse transcriptase-polymerase chain reaction for a NS5 region of flaviviruses, nucleotide and high-throughput sequencing, and viral isolation in C6/36 cells. CxFV was detected in 16 of 403 mosquito pools; sequences found in the study presented a high similarity with isolates from São Paulo, Brazil and other countries in Latin American that belong to genotype II, supporting the geographical influence on CxFV evolution. The monthly maximum likelihood estimation for CxFV ranged from 1.81 to 9.94 per 1000 mosquitoes. In addition to the CxFV complete genome, one pool contained an ORF1 sequence (756 bp) that belongs to a novel Negevirus from the Sandewavirus supergroup most similar to the Santana virus (77.1%) and another pool presented an RNA-dependent RNA polymerase sequence (1081 bp) of a novel Rhabdovirus most similar to Wuhan mosquito virus 9 (44%). After three passages in C6/36 cells, only CxFV was isolated from these co-infected pools. The importance of ISVs relies on their possible ability to interfere with arbovirus replication in competent vectors.
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Affiliation(s)
- O S Moraes
- Programa de Pós-Graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, Brazil
| | - B F Cardoso
- Programa de Pós-Graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, Brazil
| | - T A Pacheco
- Programa de Pós-Graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, Brazil
| | - A Z L Pinto
- Programa de Pós-Graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, Brazil
| | - M S Carvalho
- Programa de Pós-Graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, Brazil
| | - R C Hahn
- Programa de Pós-Graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, Brazil
| | - T C T Burlamaqui
- Centro de Inovação Tecnológica, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Brazil
| | - L F Oliveira
- Centro de Inovação Tecnológica, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Brazil
| | - R S Oliveira
- Centro de Inovação Tecnológica, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Brazil
| | - J M Vasconcelos
- Centro de Inovação Tecnológica, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Brazil
| | - P S Lemos
- Centro de Inovação Tecnológica, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Brazil
| | - M R T Nunes
- Centro de Inovação Tecnológica, Instituto Evandro Chagas, Ministério da Saúde, Ananindeua, Brazil
| | - R D Slhessarenko
- Programa de Pós-Graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal de Mato Grosso, Cuiabá, Brazil
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11
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Marques Y, Mizobata WN, Oliveira RS, de Souza M, Figueira MS, Shelykh IA, Seridonio AC. Chiral magnetic chemical bonds in molecular states of impurities in Weyl semimetals. Sci Rep 2019; 9:8452. [PMID: 31186465 PMCID: PMC6560129 DOI: 10.1038/s41598-019-44842-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 05/21/2019] [Indexed: 11/12/2022] Open
Abstract
We demonstrate that chirality of the electron scattering in Weyl semimetals leads to the formation of magnetic chemical bonds for molecular states of a pair of impurities. The effect is associated with the presence of time-reversal symmetry breaking terms in the Hamiltonian which drive a crossover from s- to p-wave scattering. The profiles of the corresponding molecular orbitals and their spin polarizations are defined by the relative orientation of the lines connecting two Weyl nodes and two impurities. The magnetic character of the molecular orbitals and their tunability open the way for using doped Weyl semimetals for spintronics and realization of qubits.
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Affiliation(s)
- Y Marques
- Departamento de Física e Química, Unesp - Univ Estadual Paulista, 15385-000, Ilha Solteira, SP, Brazil
| | - W N Mizobata
- Departamento de Física e Química, Unesp - Univ Estadual Paulista, 15385-000, Ilha Solteira, SP, Brazil
| | - R S Oliveira
- Departamento de Física e Química, Unesp - Univ Estadual Paulista, 15385-000, Ilha Solteira, SP, Brazil
| | - M de Souza
- IGCE, Unesp - Univ Estadual Paulista, Departamento de Física, 13506-900, Rio Claro, SP, Brazil
| | - M S Figueira
- Instituto de Física, Universidade Federal Fluminense, 24210-340, Niterói, RJ, Brazil
| | - I A Shelykh
- Science Institute, University of Iceland, Dunhagi-3, IS-107, Reykjavik, Iceland.,ITMO University, St. Petersburg, 197101, Russia
| | - A C Seridonio
- Departamento de Física e Química, Unesp - Univ Estadual Paulista, 15385-000, Ilha Solteira, SP, Brazil. .,IGCE, Unesp - Univ Estadual Paulista, Departamento de Física, 13506-900, Rio Claro, SP, Brazil.
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12
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Oliveira RS, Flório FM, Oliveira AMG. Self-Perception of Brazilian Adolescents who need Orthodontic Treatment. Pesqui bras odontopediatria clín integr 2018. [DOI: 10.4034/pboci.2018.181.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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13
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Gallo JF, Pinhata JMW, Simonsen V, Galesi VMN, Ferrazoli L, Oliveira RS. Prevalence, associated factors, outcomes and transmission of extensively drug-resistant tuberculosis among multidrug-resistant tuberculosis patients in São Paulo, Brazil: a cross-sectional study. Clin Microbiol Infect 2017; 24:889-895. [PMID: 29175351 DOI: 10.1016/j.cmi.2017.11.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 11/14/2017] [Accepted: 11/16/2017] [Indexed: 10/18/2022]
Abstract
OBJECTIVES To describe the prevalence, associated factors, treatment outcomes and transmission of extensively drug-resistant (XDR) tuberculosis (TB) in the state of São Paulo, Brazil, for 2011 to 2013. METHODS Drug susceptibility testing to first- and second-line drugs was performed by BACTEC MGIT 960 and molecular typing, by IS6110 restriction fragment length polymorphism. Clinical, epidemiologic and demographic data were obtained from surveillance information systems for TB. Patients were divided into three groups: multidrug resistant (MDR) TB (resistance to at least isoniazid and rifampicin), pre-XDR-TB (MDR-TB resistant to a fluoroquinolone or to at least one of the second-line injectable drugs) and XDR-TB (MDR-TB resistant to a fluoroquinolone and to at least one of the second-line injectables). RESULTS Among the 313 MDR-TB patients identified, the prevalence of XDR-TB and pre-XDR-TB was 10.2% (n = 32) and 19.2% (n = 60), respectively. Compared to MDR-TB patients, XDR-TB patients were more likely to be female (odds ratio (OR) = 2.74, 95% confidence interval (CI), 1.29-5.83), have a history of TB (OR = 5.16; 95% CI, 1.52-17.51) and present higher death rates (OR= 3.74; 95% CI 1.70-8.25). XDR-TB transmission was observed in households, between neighbours and between a patient and a healthcare worker in a hospital. CONCLUSIONS The prevalence of XDR-TB in the state of São Paulo is close to that estimated globally. Most of the XDR-TB patients were treated previously for TB and presented the lowest successful outcome rates. Because transmission of XDR-TB occurred, it is important that timely diagnosis of drug resistance is performed.
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Affiliation(s)
- J F Gallo
- Núcleo de Tuberculose e Micobacterioses, Centro de Bacteriologia, Instituto Adolfo Lutz, São Paulo, Brazil
| | - J M W Pinhata
- Núcleo de Tuberculose e Micobacterioses, Centro de Bacteriologia, Instituto Adolfo Lutz, São Paulo, Brazil
| | - V Simonsen
- Núcleo de Tuberculose e Micobacterioses, Centro de Bacteriologia, Instituto Adolfo Lutz, São Paulo, Brazil
| | - V M N Galesi
- Divisão de Controle da Tuberculose, Centro de Vigilância Epidemiológica 'Prof. Alexandre Vranjac', São Paulo, Brazil
| | - L Ferrazoli
- Núcleo de Tuberculose e Micobacterioses, Centro de Bacteriologia, Instituto Adolfo Lutz, São Paulo, Brazil
| | - R S Oliveira
- Núcleo de Tuberculose e Micobacterioses, Centro de Bacteriologia, Instituto Adolfo Lutz, São Paulo, Brazil.
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14
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Luz PB, Stringhini CH, Otto BR, Port ALF, Zaleski V, Oliveira RS, Pereira JT, Lussi A, Rodrigues JA. Performance of undergraduate dental students on ICDAS clinical caries detection after different learning strategies. Eur J Dent Educ 2015; 19:235-241. [PMID: 25495379 DOI: 10.1111/eje.12131] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/17/2014] [Indexed: 06/04/2023]
Abstract
AIM This study aimed to evaluate the effect of a digital learning tool on undergraduate dental students' performance in detecting dental caries using ICDAS. METHODS An experimental digital learning tool (DLT) was created using digital photographs of sound and carious teeth. Thirty-nine students were divided into three groups (n = 13) and each assessed 12 randomly allocated patients before and after learning strategies: G1, ICDAS e-learning program; G2, ICDAS e-learning program plus DLT; G3, no learning strategy. Students (n = 32) reassessed patients 2 weeks after training. RESULTS Comparing before and after the learning strategies, any difference in the values of specificity and area under the ROC curve for all groups was found. Sensitivity was statistically significantly higher for G1 and G2. Comparing the groups, G2 showed a significant increase in sensitivity at the D2 and D3 thresholds. Spearman's correlations with the gold standard before and after the learning strategy were 0.60 and 0.61 for G1, 0.57 and 0.63 for G2, and 0.54 and 0.54 for G3, respectively. The Wilcoxon test showed a statistically significant difference between the values obtained before and after learning strategies for G1 and G2. CONCLUSIONS Use of the DLT after the ICDAS e-learning program tended to increase the sensitivity of ICDAS used by undergraduate dental students. The DLT appeared to improve dental students' ability to use ICDAS.
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Affiliation(s)
- P B Luz
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - C H Stringhini
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - B R Otto
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - A L F Port
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - V Zaleski
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - R S Oliveira
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - J T Pereira
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - A Lussi
- Department of Preventive, Restorative and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - J A Rodrigues
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
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15
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Gomes DC, Jamra SA, Leal LF, Colli LM, Campanini ML, Oliveira RS, Martinelli CE, Elias PCL, Moreira AC, Machado HR, Saggioro F, Neder L, Castro M, Antonini SR. Sonic Hedgehog pathway is upregulated in adamantinomatous craniopharyngiomas. Eur J Endocrinol 2015; 172:603-8. [PMID: 25693592 DOI: 10.1530/eje-14-0934] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OBJECTIVES Pituitary stem cells play a role in the oncogenesis of human adamantinomatous craniopharyngiomas (aCPs). We hypothesized that crosstalk between the Wnt/β-catenin and Sonic Hedgehog (SHH) pathways, both of which are important in normal pituitary development, would contribute to the pathogenesis of aCPs. DESIGN To explore the mRNA and protein expression of components of the SHH signaling pathway in aCPs and their relationship with the identification of CTNNB1/β-catenin mutations and patients outcomes. PATIENTS AND METHODS In 18 aCP samples, CTNNB1 was sequenced, and the mRNA expression levels of SHH pathway members (SHH, PTCH1, SMO, GLI1, GLI2, GLI3, and SUFU) and SMO, GLI1, GLI3, SUFU, β-catenin, and Ki67 proteins were evaluated by quantitative real-time PCR and immunohistochemistry respectively. Anterior normal pituitaries were used as controls. Associations between molecular findings and clinical data were analyzed. RESULTS The aCPs presented higher mRNA expression of SHH (+400-fold change (FC); P<0.01), GLI1 (+102-FC; P<0.001), and GLI3 (+5.1-FC; P<0.01) than normal anterior pituitaries. Longer disease-free survival was associated with low SMO and SUFU mRNA expression (P<0.01 and P=0.02 respectively). CTNNB1/β-catenin mutations were found in 47% of the samples. aCPs with identified mutations presented with higher mRNA expression of SMO and GLI1 (+4.3-FC; P=0.02 and +10.2-FC; P=0.03 respectively). SMO, GLI1, GLI3, and SUFU staining was found in 85, 67, 93, and 64% of the samples respectively. Strong GLI1 and GLI3 staining was detected in palisade cells, which also labeled Ki67, a marker of cell proliferation. CONCLUSIONS The upregulation of SHH signaling occurs in aCPs. Thus, activation of Wnt/β-catenin and SHH pathways, both of which are important in pituitary embryogenesis, appears to contribute to the pathogenesis of aCP.
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Affiliation(s)
- D C Gomes
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - S A Jamra
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - L F Leal
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - L M Colli
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - M L Campanini
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - R S Oliveira
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - C E Martinelli
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - P C L Elias
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - A C Moreira
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - H R Machado
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - F Saggioro
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - L Neder
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - M Castro
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
| | - S R Antonini
- School of Medicine of Ribeirao PretoUniversity of Sao Paulo, Avenida Bandeirantes, 3900 - Monte Alegre, CEP 14049-900, Ribeirao Preto, Sao Paulo, BrazilFederal University of UberlandiaUberlandia, Minas Gerais, Brazil
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16
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Souza CCR, Dombroski TCD, Machado HR, Oliveira RS, Rocha LB, Rodrigues ARA, Neder L, Chimelli L, Corrêa VMA, Larson RE, Martins AR. Myosin Va is developmentally regulated and expressed in the human cerebellum from birth to old age. Braz J Med Biol Res 2015; 46:164-70. [PMID: 23558932 PMCID: PMC3854355 DOI: 10.1590/1414-431x20122627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Accepted: 12/03/2012] [Indexed: 12/04/2022] Open
Abstract
Myosin Va functions as a processive, actin-based motor molecule highly enriched
in the nervous system, which transports and/or tethers organelles, vesicles, and
mRNA and protein translation machinery. Mutation of myosin Va leads to Griscelli
disease that is associated with severe neurological deficits and a short life
span. Despite playing a critical role in development, the expression of myosin
Va in the central nervous system throughout the human life span has not been
reported. To address this issue, the cerebellar expression of myosin Va from
newborns to elderly humans was studied by immunohistochemistry using an
affinity-purified anti-myosin Va antibody. Myosin Va was expressed at all ages
from the 10th postnatal day to the 98th year of life, in molecular, Purkinje and
granular cerebellar layers. Cerebellar myosin Va expression did not differ
essentially in localization or intensity from childhood to old age, except
during the postnatal developmental period. Structures resembling granules and
climbing fibers in Purkinje cells were deeply stained. In dentate neurons, long
processes were deeply stained by anti-myosin Va, as were punctate nuclear
structures. During the first postnatal year, myosin Va was differentially
expressed in the external granular layer (EGL). In the EGL, proliferating
prospective granule cells were not stained by anti-myosin Va antibody. In
contrast, premigratory granule cells in the EGL stained moderately. Granule
cells exhibiting a migratory profile in the molecular layer were also moderately
stained. In conclusion, neuronal myosin Va is developmentally regulated, and
appears to be required for cerebellar function from early postnatal life to
senescence.
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Affiliation(s)
- C C R Souza
- Departamento de Neurologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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17
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Dias PAS, Sampaio MV, Rodrigues MP, Korndörfer AP, Oliveira RS, Ferreira SE, Korndörfer GH. Induction of resistance by silicon in wheat plants to alate and apterous morphs of Sitobion avenae (Hemiptera: Aphididae). Environ Entomol 2014; 43:949-56. [PMID: 25182615 DOI: 10.1603/en13234] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Despite the knowledge about the effects of silicon augmenting antibiosis and nonpreference of plants by apterous aphids, few studies exist on such effects with alate aphids. This study evaluated the effects of silicon fertilization on the biology of alate and apterous morphs of Sitobion avenae (F.) (Hemiptera: Aphididae), and the effect on nonpreference by S. avenae alates for wheat plants with or without silicon fertilization. A method for rearing aphids on detached leaves was evaluated comparing the biology of apterous aphids reared on wheat leaf sections and on whole plants with and without silicon fertilization. Because the use of detached leaves was a reliable method, the effect of silicon fertilization on the biology of apterous and alate S. avenae was assessed using wheat leaf sections. Biological data of aphids were used to calculate a fertility life table. Finally, the effect of silicon fertilization on the nonpreference of alate aphids was carried out for both vegetative and reproductive phases of wheat. Thirty alate aphids were released in the center of a cage, and the number of aphids per whole plant with or without silicon fertilization was observed. Silicon fertilization induced antibiosis resistance in wheat plants to apterous morphs as shown by reduced fecundity, reproductive period, longevity, intrinsic rate of increase, and net reproductive rate; however, alates were unaffected. Plants that received silicon fertilization had fewer alate aphids in both the vegetative and reproductive phases. Thus, silicon fertilization can reduce colonization by alates, enhancing nonpreference resistance, and population growth of apterous S. avenae in wheat plants.
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Affiliation(s)
- P A S Dias
- Agronomy Institute, Federal University of Uberlândia, Caixa Postal 593, CEP 38.408-100, Uberlândia, MG, Brazil
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Brasileiro BP, Silva SA, Souza DR, Santos PA, Oliveira RS, Lyra DH. Genetic diversity and selection gain in the physic nut (Jatropha curcas). Genet Mol Res 2013; 12:2341-50. [PMID: 23315871 DOI: 10.4238/2013.january.4.12] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The use of efficient breeding methods depends on knowledge of genetic control of traits to be improved. We estimated genetic parameters, selection gain, and genetic diversity in physic nut half-sib families, in order to provide information for breeding programs of this important biofuel species. The progeny test included 20 half-sib families in 4 blocks and 10 plants per plot. The mean progeny heritability values were: 50% for number of bunches, 47% for number of fruits, 35% for number of seeds, 6% for stem diameter, 26% for number of primary branches, 14% for number of secondary branches, 66% for plant height, and 25% for survival of the plants, demonstrating good potential for early selection in plant height, number of branches, and number of fruits per plant. In the analysis of genetic diversity, genotypes were divided into 4 groups. Genotypes 18, 19, 20, and 8 clustered together and presented the highest means for the vegetative and production. Lower means were observed in the 17, 12, 13, and 9 genotypes from the same group. We detected genetic variability in this population, with high heritability estimates and accuracy, demonstrating the possibility of obtaining genetic gains for vegetative characters and production at 24 months after planting.
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Affiliation(s)
- B P Brasileiro
- Departamento de Estatística, Universidade Federal de Viçosa, Viçosa, MG, Brasil.
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Oliveira RS, Leicht AS, Bishop D, Barbero-Álvarez JC, Nakamura FY. Seasonal changes in physical performance and heart rate variability in high level futsal players. Int J Sports Med 2012; 34:424-30. [PMID: 23143705 DOI: 10.1055/s-0032-1323720] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this study was to determine the changes in physical performance and resting heart rate variability (HRV) in professional futsal players during the pre-season and in-season training periods. 11 athletes took part in the study (age=24.3±2.9 years; height=176.3±5.2 cm; weight=76.1±6.3 kg), and performed a repeated-sprint ability (RSA) test [6×40 m (20+20 m with a 180° change of direction) sprints separated by 20 s of passive recovery] and Yo-Yo intermittent recovery test level 1 (Yo-Yo IR1) at 3 different moments (M1=beginning of pre-season; M2=end of pre-season; M3=mid in-season). The HRV indices were assessed at the same moments. After the short pre-season (3-week), mean RSA time (RSAmean) (M1=7.43±0.2 s; M2=7.24±0.2 s; P=0.003), decrement in RSA performance (RSAdecrement) (M1=6.7±0.3%; M2=5.0±0.9%; P=0.001), and Yo-Yo IR1 distance (M1=1.244±298 m; M2=1.491±396 m; P=0.002) were significantly improved (P<0.05). During the in-season (i. e., M3), performance in Yo-Yo IR1 and RSAmean were maintained. In contrast, RSAbest (M2=6.89±0.2 to M3=6.69±0.3; P=0.001) was improved and RSAdecrement (M2=5.0±0.9% to M3=6.6±0.9%; P=0.001) was impaired. At M2, there was an increase in HRV vagal-related indices compared with M1 that was maintained at M3. In conclusion, after a short pre-season, futsal players improved their RSA and Yo-Yo IR1 performance with concomitant improvements in HRV. These indices were maintained during the in-season period while RSAbest was improved and RSAdecrement impaired. Frequent monitoring of these performances and HRV indices may assist with identification of individual training adaptations and/or early signs of maladaption.
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Affiliation(s)
- R S Oliveira
- MSc in Physical Education UEL-UEM, Universidade Estadual de Londrina, Londrina, Brazil
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Abstract
AIMS Glyphosate-resistant (GR) soybean production increases each year because of the efficacy of glyphosate for weed management. A new or 'second' generation of GR soybean (GR2) is now commercially available for farmers that is being promoted as higher yielding relative to the previous, 'first generation' (GR1) cultivars. Recent reports show that glyphosate affects the biology and ecology of rhizosphere micro-organisms in GR soybean that affect yield. The objective of this research was to evaluate the microbiological interactions in the rhizospheres of GR2 and GR1 soybean and the performance of the cultivars with different rates of glyphosate applied at different growth stages. METHODS AND RESULTS A greenhouse study was conducted using GR1 and GR2 soybean cultivars grown in a silt loam soil. Glyphosate was applied at V2, V4 and V6 growth stages at three rates. Plants harvested at R1 growth stage had high root colonization by Fusarium spp.; reduced rhizosphere fluorescent pseudomonads, Mn-reducing bacteria, and indoleacetic acid-producing rhizobacteria; and reduced shoot and root biomass. CONCLUSIONS Glyphosate applied to GR soybean, regardless of cultivar, negatively impacts the complex interactions of microbial groups, biochemical activity and root growth that can have subsequent detrimental effects on plant growth and productivity. SIGNIFICANCE AND IMPACT OF THE STUDY The information presented here will be crucial in developing strategies to overcome the potential detrimental effects of glyphosate in GR cropping systems.
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Affiliation(s)
- L H S Zobiole
- Center for Advanced Studies in Weed Research, State University of Maringá, Paraná, Brazil.
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Oliveira RS, Resende C, Campos J, Salgado C. [Surgical approach to sialorrhea: a casuistic review and evaluation of grade of satisfaction]. Cir Pediatr 2010; 23:211-214. [PMID: 21520552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
INTRODUCTION Drooling or sialorrhea is the involuntary, passive spillage of saliva from the mouth due to inability to handle oral secretions. The medical, psychosocial and economic impact of drooling is underestimated. Treatment should always involve a multidisciplinary team and can include a medical or surgical approach. Various surgical techniques are used to manage drooling; re-routing of the salivary ducts is one of the preferred methods in more significant situations. OBJECTIVES To analyze retrospectively the group of children submitted to surgical correction of drooling in São Teotónio's Hospital and evaluate the clinical and caregiver satisfaction outcomes. MATERIAL AND METHODS We analyse the clinical process of children submitted to surgical correction of drooling. Satisfaction scores were obtained by phone interview. RESULTS Between January of 2003 and June of 2009, 16 child were submitted to surgical intervention for drooling, with a total of 17 surgeries. Most of them were males and have ages between 3 and 23 years, with the majority with ages between 10 and 15 years. All of them suffered from neurologic disease, mainly cerebral palsy. The majority were hospitalised for I to 2 days and no surgical complications were observed. In a significant percentage, good results were obtained and in 3 cases total resolution of drooling were reported. In about 44% of caregivers stayed very happy with the results of surgery. CONCLUSIONS Drooling is an important comorbility in child with neuro-muscular disease and is treatment can never be underestimated. By the analyses of the results of our surgical center, the re-routing of salivary ducts method reveals to be effective.
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Affiliation(s)
- R S Oliveira
- Departamento de Cirurgía Pedidtrica, Servicio de Pediatria, Hospital São Teotónio EPE, Viseu, Portugal.
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Santos Oliveira R, Dos Anjos Carneiro-Leão AM. Técnicas para aplicação de FDG-18 na clínica médica oncológica. Acta Sci Health Sci 2008. [DOI: 10.4025/actascihealthsci.v29i2.1085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Oliveira RS, Barros Neto TL, Braga ALF, Raso V, Pereira LAA, Morette SR, Carneiro RC. Impact of acute exposure to air pollution on the cardiorespiratory performance of military firemen. Braz J Med Biol Res 2007; 39:1643-9. [PMID: 17160274 DOI: 10.1590/s0100-879x2006005000046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/06/2006] [Accepted: 09/11/2006] [Indexed: 11/22/2022]
Abstract
The objective of the present study was to determine the impact of acute short-term exposure to air pollution on the cardiorespiratory performance of military firemen living and working in the city of Guarujá, São Paulo, Brazil. Twenty-five healthy non-smoking firemen aged 24 to 45 years had about 1 h of exposure to low and high levels of air pollution. The tests consisted of two phases: phase A, in Bertioga, a town with low levels of air pollution, and phase B, in Cubatão, a polluted town, with a 7-day interval between phases. The volunteers remained in the cities (Bertioga/Cubatão) only for the time required to perform the tests. Cumulative load 10 +/- 2 min-long exertion tests were performed on a treadmill, consisting of a 2-min stage at a load of 7 km/h, followed by increasing exertion of 1 km h-1 min-1 until the maximum individual limit. There were statistically significant differences (P < 0.05) in anaerobic threshold (AT) between Cubatão (35.04 +/- 4.91 mL kg-1 min-1) and Bertioga (36.98 +/- 5.62 mL kg-1 min-1; P = 0.01), in the heart rate at AT (AT HR; Cubatão 152.08 +/- 14.86 bpm, Bertioga 157.44 +/- 13.64 bpm; P = 0.001), and in percent maximal oxygen consumption at AT (AT%VO2max; Cubatão 64.56 +/- 6.55%, Bertioga 67.40 +/- 5.35%; P = 0.03). However, there were no differences in VO2max, maximal heart rate or velocity at AT (ATvel) observed in firemen between towns. The acute exposure to pollutants in Cubatão, SP, caused a significant reduction in the performance at submaximal levels of physical exertion.
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Affiliation(s)
- R S Oliveira
- Escola de Educação Física, Polícia Militar do Estado de São Paulo, Av. Cruzeiro do Sul 548, 03033-020 São Paulo, SP, Brazil.
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Giampaglia CMS, Martins MC, Chimara E, Oliveira RS, de Oliveira Vieira GB, Marsico AG, Mello FCQ, de Souza Fonseca L, Kritski A, da Silva Telles MA. Differentiation of Mycobacterium tuberculosis from other mycobacteria with rho-nitrobenzoic acid using MGIT960. Int J Tuberc Lung Dis 2007; 11:803-7. [PMID: 17609058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023] Open
Abstract
SETTING Mycobacteria growth in media with the addition of inhibitory substances has been used in species identification. Growth of the Mycobacterium tuberculosis complex (MTC) is inhibited by rho-nitrobenzoic acid (PNB), whereas non-tuberculous mycobacteria (NTM) are resistant. OBJECTIVE To develop a rapid PNB test using the automated BACTEC MGIT960 system and to evaluate its usefulness in the screening of mycobacterial isolates. DESIGN PNB tests were performed in 93 MTC strains and 61 NTM strains from the Instituto Adolfo Lutz Culture Collection. PNB was added to Löwenstein-Jensen (LJ) medium and to BACTEC MGIT960 medium. RESULTS The MTC strains were all PNB-susceptible, confirming the original identification. Among 10 NTM species, all were found to be resistant to PNB, except for one strain of M. kansasii and another of M. marinum. The median time to obtain presumptive identification of MTC by inhibition test in the BACTEC MGIT960 system was 6.3 days and for NTM it was 2.5 days. The presumptive identification of MTC in LJ was mostly obtained after day 20. CONCLUSION The key finding of this analysis was the possibility of combining the traditionally accepted method proposed by Tsukamura and Tsukamura in 1964 with the modern, safe and rapid BACTEC MGIT960 methodology.
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Affiliation(s)
- C M S Giampaglia
- Mycobacteria Department, Instituto Adolfo Lutz, Av Dr Arnaldo, 351 São Paulo, Brazil.
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Oliveira RS, Colaço W, Coulaud-Cunha S, Castilho SRD. Revisão sistemática em fitoterapia: padronização internacional de qualidade. Rev bras farmacogn 2007. [DOI: 10.1590/s0102-695x2007000200023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Oliveira RS, Vosátka M, Dodd JC, Castro PML. Studies on the diversity of arbuscular mycorrhizal fungi and the efficacy of two native isolates in a highly alkaline anthropogenic sediment. Mycorrhiza 2005; 16:23-31. [PMID: 16007472 DOI: 10.1007/s00572-005-0010-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2005] [Accepted: 06/09/2005] [Indexed: 05/03/2023]
Abstract
A field survey of the arbuscular mycorrhizal status of herbaceous plant species was conducted in a highly alkaline anthropogenic sediment resulting from the disposal of waste from an acetylene and polyvinyl chloride factory. Most plant species found at the site were mycorrhizal and the dominant mycotrophic plant species was Conyza bilbaoana. Fungal species richness was assessed by identification of spores extracted from the sediment and from continuously propagated trap pot cultures. All of the six species of arbuscular mycorrhizal fungi (AMF) found were from the genus Glomus. Glomus intraradices and G. mosseae were found in field-collected sediment samples and also occurred most frequently in trap cultures. To test the symbiotic effectiveness of these two fungi, seedlings of C. bilbaoana were inoculated with either native G. intraradices BEG163 or G. mosseae BEG198 and non-native G. intraradices BEG75 or G. mosseae BEG25 isolates in sterile and non-sterile sediment collected from the study site. All four isolates were able to colonise C. bilbaoana. However, AMF native to the target sediments were generally more effective than the non-native fungi in promoting plant establishment and growth under highly alkaline conditions. The non-native G. intraradices was, however, more effective than the non-native G. mosseae. The results of this study suggest the use of adapted AMF as inoculants for phytorestoration of alkaline anthropogenic-stressed sediments.
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Affiliation(s)
- R S Oliveira
- Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal
| | - M Vosátka
- Institute of Botany, Academy of Sciences of the Czech Republic, 252 43, Pruhonice, Czech Republic
| | - J C Dodd
- PlantWorks Limited, 1/19 Innovation Building 1000, Kent Science Park, Sittingbourne, Kent, ME9 8AG, UK
| | - P M L Castro
- Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Rua Dr. António Bernardino de Almeida, 4200-072, Porto, Portugal.
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Oliveira RS, Castro PML, Dodd JC, Vosátka M. Synergistic effect of Glomus intraradices and Frankia spp. on the growth and stress recovery of Alnus glutinosa in an alkaline anthropogenic sediment. Chemosphere 2005; 60:1462-70. [PMID: 16054916 DOI: 10.1016/j.chemosphere.2005.01.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2004] [Revised: 01/11/2005] [Accepted: 01/17/2005] [Indexed: 05/03/2023]
Abstract
The presence of actinorhizas and arbuscular mycorrhizas may reduce plant stresses caused by adverse soil conditions. A greenhouse experiment was conducted using a sediment with a high pH, resulting from the disposal of waste originated at an acetylene and polyvinylchloride factory, in which Black alder (Alnus glutinosa) seedlings were inoculated either with Glomus intraradices BEG163 (originally isolated from the same sediment), Frankia spp. or both symbionts. After a 6-month growth period, plants inoculated with both symbionts had significantly greater leaf area, shoot height and total biomass when compared with the uninoculated control, the Frankia spp. and the G. intraradices treatments alone. In dual inoculated plants the N and P leaf content was significantly increased. A defoliation experiment was performed to evaluate the stress recovery of A. glutinosa and plants inoculated with both symbionts had a faster leaf regrowth and produced greater numbers of leaves. The dual inoculation resulted in greater numbers of and larger root nodules than when inoculated with Frankia spp. alone. The length and NADH diaphorase activity of the extraradical mycelium of G. intraradices was also significantly greater when dual inoculation was performed. The inoculation with Frankia spp. alone was shown to improve A. glutinosa growth, whereas G. intraradices alone had no positive effect under these environmental conditions. However, when the two symbionts were inoculated together a synergistic effect was observed resulting in a greater benefit for the plants and for both symbionts. The relevance of these findings for the phytorestoration of anthropogenic stressed sediments with high pH is discussed.
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Affiliation(s)
- R S Oliveira
- Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal.
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Abstract
In order to develop a new experimental animal model of infection with Mycobacterium chelonae in keratomileusis, we conducted a double-blind prospective study on 24 adult male New Zealand rabbits. One eye of each rabbit was submitted to automatic lamellar keratotomy with the automatic corneal shaper under general anesthesia. Eyes were immunosuppressed by a single local injection of methyl prednisolone. Twelve animals were inoculated into the keratomileusis interface with 1 microl of 10(6) heat-inactivated bacteria (heat-inactivated inoculum controls) and 12 with 1 microl of 10(6) live bacteria. Trimethoprim drops (0.1%, w/v) were used as prophylaxis for the surgical procedure every 4 h (50 microl, qid). Animals were examined by 2 observers under a slit lamp on the 1st, 3rd, 5th, 7th, 11th, 16th, and 23rd postoperative days. Slit lamp photographs were taken to document clinical signs. Animals were sacrificed when corneal disease was detected and corneal samples were taken for microbiological analysis. Eleven of 12 experimental rabbits developed corneal disease, and M. chelonae could be isolated from nine rabbits. Eleven of the 12 controls receiving a heat-inactivated inoculum did not develop corneal disease. M. chelonae was not isolated from any of the control rabbits receiving a heat-inactivated inoculum, or from the healthy cornea of control rabbits. Corneal infection by M. chelonae was successfully induced in rabbits submitted to keratomileusis. To our knowledge, this is the first animal model of M. chelonae infection following corneal flaps for refractive surgery to be described in the literature and can be used for the analysis of therapeutic responses.
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Affiliation(s)
- C B D Adan
- Departamento de Oftalmologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, SP, Brazil.
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Oliveira RS, Sircili MP, Oliveira EMD, Balian SC, Ferreira-Neto JS, Leão SC. Identification of Mycobacterium avium genotypes with distinctive traits by combination of IS1245-based restriction fragment length polymorphism and restriction analysis of hsp65. J Clin Microbiol 2003; 41:44-9. [PMID: 12517823 PMCID: PMC149585 DOI: 10.1128/jcm.41.1.44-49.2003] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2002] [Revised: 06/26/2002] [Accepted: 09/26/2002] [Indexed: 11/20/2022] Open
Abstract
One-hundred eight Mycobacterium avium isolates from pigs, humans, birds, and bovines were typed by the IS1245-based restriction fragment length polymorphism (RFLP) method and PCR-restriction enzyme analysis (PRA) of hsp65. Nine clusters of isolates showing more than 80% similarity in their RFLP profiles were detected. The largest cluster (cluster B) included 32 of 79 pig isolates (40.5%), 3 of 25 human isolates (12%), and 1 of 2 bovine isolates, comprising 33% of all isolates. The second largest cluster (cluster A) included 18 pig isolates (22.8%) and 6 human isolates (24%). Six smaller clusters included six pig isolates (clusters C and D), four and two human isolates (clusters E and F, respectively), two pig isolates (cluster I), and two pig isolates plus one bovine isolate and the avian purified protein derivative strain (cluster H). Cluster G represented the "bird-type" profile and included the bird isolate in this series, one pig isolate, plus reference strain R13. PRA revealed four allelic variants. Seventy-seven isolates were identified as M. avium PRA variant I, 24 were identified as M. avium PRA variant II, 6 were identified as M. avium PRA variant III, and 1 was identified as M. avium PRA variant IV. Except for three isolates from cluster B, each of the RFLP clusters was associated with a single PRA pattern. Isolates with unique (nonclustered) RFLP profiles were distributed between PRA variants I and II, and there was one unique isolate of PRA variant IV. These observations are consistent with divergent evolution within M. avium, resulting in the emergence of distinct lineages with particular competence to infect animals and humans.
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Affiliation(s)
- R S Oliveira
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, UNIFESP-EPM, São Paulo, Brazil
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Zanini MS, Moreira EC, Lopes MT, Oliveira RS, Leão SC, Fioravanti RL, Roxo E, Zumarraga M, Romano MI, Cataldi A, Salas CE. Mycobacterium bovis: polymerase chain reaction identification in bovine lymphonode biopsies and genotyping in isolates from Southeast Brazil by spolygotyping and restriction fragment length polymorphism. Mem Inst Oswaldo Cruz 2001; 96:809-13. [PMID: 11562707 DOI: 10.1590/s0074-02762001000600012] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Diagnosis of the Mycobacterium tuberculosis complex by direct PCR of mediastinal lymphnode DNA and microbiological tests were compared in cattle suspicious of bearing tuberculous-like lesions detected during slaughter. The PCR procedure applied on DNA samples (n=54) obtained by adding alpha -casein into the thiocyanate extraction mix was positive in 70% of the samples. PCR confirmed the identification of 23 samples (100%) that grew in culture, 9 samples (60%) that failed to grow in culture, plus 6 (37.5%) samples that resulted in growth of bacterial contaminants. Genotyping by IS6110-RFLP and DR-spoligotyping analysis of seven samples revealed the presence of several polimorphisms. Seven of the isolates contained multiple copies of IS6110, thus defining the existence of five singular genotypes.
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Affiliation(s)
- M S Zanini
- Escola de Veterinária, ICB, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brasil
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Oliveira RS, Sircili MP, Ueki SY, Telles MA, Schnabel B, Briones MR, Leão SC. PCR-restriction enzyme analysis of a bone marrow isolate from a human immunodeficiency virus-positive patient discloses polyclonal infection with two Mycobacterium avium strains. J Clin Microbiol 2000; 38:4643-5. [PMID: 11101612 PMCID: PMC87653 DOI: 10.1128/jcm.38.12.4643-4645.2000] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Polyclonal infection by Mycobacterium avium was detected by hsp65 PCR-restriction enzyme analysis (PRA) in a bone marrow isolate from an AIDS patient. Two M. avium strains, differing in colony morphology, PRA HaeIII digestion pattern, insertion element (IS) 1245 amplification, and restriction fragment length polymorphism fingerprints with IS1245 and IS1311 probes, were isolated.
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Affiliation(s)
- R S Oliveira
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo-Escola Paulista de Medicina, São Paulo, Brazil
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Oliveira RS, Machado HR. Avaliação da velocidade de fluxo sangüíneo cerebral através da utilização do Doppler transcraniano em crianças e adolescentes com hidrocefalia. Acta Cir Bras 2000. [DOI: 10.1590/s0102-86502000000600041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Abstract
The sorption of imidacloprid (1-[(6-chloro-3-pyridinyl)-methyl]-N-nitro-2-imidazolid-inimine ) (IMI) and its metabolites imidacloprid-urea (1-[(6-chloro-3-pyridinyl)-methyl]-2-imidazol-idinone) (IU), imidacloprid-guanidine (1-[(6-chloro-3-pyridinyl)-methyl]-4,5-dihydro-1H-imidazol-2-amine) (IG), and imidacloprid-guanidine-olefin (1-[(6-chloro-3-pyridinyl)methyl]-1H-imidazol-2-amine) (IGO) was determined on six typical Brazilian soils. Sorption of the chemicals on the soil was characterized using the batch equilibration method. The range and order of sorption (Kd) on the six soils was IG (4.75-134) > or = IGO (2.87-72.3) > IMI (0.55-16.9) > IU (0.31-9.50). For IMI and IU, Kd was correlated with soil organic carbon (OC) content and CEC, the latter due to the high correlation between OC and cation exchange capacity (CEC) (R2 = 0.98). For IG and IGO, there was no correlation of sorption to clay, pH, OC or CEC due to the high sorption on all soils. Average Koc values were IU = 170, IMI = 362, IGO = 2433, and IG = 3500. Although Kd and Koc values found were consistently lower than those found in soils developed in non-tropical climates, imidacloprid and its metabolites were still considered to be slightly mobile to immobile in Brazilian soils.
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Affiliation(s)
- R S Oliveira
- Departamento de Agronomia, Universidade Estadual de Maringa, PR, Brazil
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Moreira RC, Castrignano SB, Carmona RDC, Gomes FM, Saes SG, Oliveira RS, Souza DF, Takimoto S, Costa MC, Waldman EA. An exanthematic disease epidemic associated with coxsackievirus B3 infection in a day care center. Rev Inst Med Trop Sao Paulo 1995; 37:235-8. [PMID: 8525269 DOI: 10.1590/s0036-46651995000300009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
An epidemic of exanthematic illness in a day care center is described. Ten children aged 7 to 13 months were affected by the illness. The exanthem was characterized by nonconfluent macular or maculopapular lesions that appeared on the face, body and limbs. Fifty percent of the infected children had fever of up to 39 degrees C at the beginning of the disease. Coxsackievirus B3 (CB3) was isolated from the stool of one ill child. Paired serum samples were obtained from eight ill children and six of them presented seroconversion to CB3. Antibodies to CB3 were detected at titers higher than 16 in a single serum sample collected from the other two patients. Neutralizing antibodies to CB3 were detected in 71.0% of the contact children.
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Abstract
Twenty-five bees, five from each of five hives, were trained to collect food at a table. When the bee reached the table, time was recorded for 12 visits. Then a blue and yellow pan was substituted for the original metal pan, and time and correct responses were recorded for 30 trips (discrimination phase). Finally, food was taken from the pan and extinction was recorded as incorrect responses for 20 visits. Variance analysis was carried out, and genetic variance was undetected for discrimination, but was detected for extinction. It is concluded that learning is very important for bees, so that any impairment in such ability affects colony survival.
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