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Oliveira BR, Marques AP, Ressurreição M, Moreira CJS, S Pereira C, B Crespo MT, Pereira VJ. Inactivation of Aspergillus species in real water matrices using medium pressure mercury lamps. J Photochem Photobiol B 2021; 221:112242. [PMID: 34214837 DOI: 10.1016/j.jphotobiol.2021.112242] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 05/12/2021] [Accepted: 06/10/2021] [Indexed: 11/16/2022]
Abstract
The aim of this work is to understand the inactivation efficiency of medium pressure mercury lamps, measured in terms of growth inhibition as well as cell death, damage and response, using three strains from three different Aspergillus species (A. fumigatus, A. niger and, A. terreus) spiked in filtered surface water. A complete characterization of the effect of the treatment on each strain of the fungal species was assessed considering spores' morphology, cell wall integrity and enzymatic activity, the formation of pyrimidine dimers in the DNA and proteome analysis. Results showed that, when subjected to medium pressure mercury lamps, A. niger is the most resistant to inactivation, that both A. fumigatus and A. niger suffer more morphological changes and present a higher number of damaged spores and A. terreus presented more dead spores. DNA damages detected in A. niger were able to be repaired to some extent, under both light and dark conditions. Finally, proteome analysis showed that the UV radiation treatment triggered different types of stress response, including cell wall reorganization and DNA repair in A. fumigatus and A. terreus, and oxidative stress responses like the increase in production of citric acid and itaconic acid in A. niger and A. terreus, respectively.
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Affiliation(s)
- B R Oliveira
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2780-901 Oeiras, Portugal; Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - A P Marques
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2780-901 Oeiras, Portugal
| | - M Ressurreição
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2780-901 Oeiras, Portugal
| | - C J S Moreira
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - C S Pereira
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - M T B Crespo
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2780-901 Oeiras, Portugal; Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - V J Pereira
- iBET - Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2780-901 Oeiras, Portugal; Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal.
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Silva APF, Da Costa DJ, Vicente DLC, Da Silva AA, Pereira CS. PRODUÇÃO DE MILHO EM DIFERENTES PROFUNDIDADES DE PLANTIO. Revista Brasileira de Engenharia de Biossistemas 2019. [DOI: 10.18011/bioeng2019v13n4p330-338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
O milho (Zea mays L.) é um dos cereais mais utilizados e relevantes, devido às suas propriedades nutricionais, composição química e diversidade de utilização, tanto na alimentação humana quanto animal. Com as constantes inovações no setor agropecuário, buscando-se uma melhor produção e redução de custos, surge um crescente interesse por prover alternativas que maximizem os resultados produtivos do setor. Nesse contexto, o objetivo deste experimento foi analisar os resultados e variações da cultura do milho, em relação ao seu desenvolvimento e produtividade, obtida em diferentes profundidades de plantio. O experimento foi implantado em condições de campo, utilizando o delineamento em blocos casualizados, constituídos de 4 tratamentos e 4 repetições, em 4 linhas, espaçadas a 0,55 metros entre linhas e 16 metros de comprimento, totalizando 35,2m² por parcela. Foram empregados quatro tratamentos: 1, 2, 3 e 4, definidos a 1 cm, 3 cm, 5 cm e 7 cm respectivamente. Foram avaliados os seguintes parâmetros: índice de velocidade de emergência, diâmetro de colmo, altura da planta e produtividade. Com este estudo, observou-se que o índice de velocidade de emergência sofre influência da profundidade de semeadura, quanto menor, mais rápido a planta emerge. Em relação à produtividade, o resultado foi inverso ao IVE, ou seja, quanto maior a profundidade, melhor o índice produtivo da cultura analisada, ratificado pelo melhor índice de diâmetro do colmo, altura e produção.
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Affiliation(s)
| | | | | | - A. A. Da Silva
- UNIFOR - Centro Universitário de Formiga, Formiga, MG, Brasil
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Pinheiro SB, Costa HJS, Freitas JM, Frade PR, Silva AA, Pereira CS. O IMPACTO DO DÉFICIT HÍDRICO E DO TRATAMENTO INDUSTRIAL DE SEMENTES NA GERMINAÇÃO, DESENVOLVIMENTO, VIGOR E PRODUÇÃO DE MATÉRIA SECA EM PLÂNTULAS DE SOJA. Revista Brasileira de Engenharia de Biossistemas 2019. [DOI: 10.18011/bioeng2019v13n3p250-261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
O cultivo da soja exige um alto nível de qualidade em relação às sementes empregadas, além de ser muito dependente da condição hídrica. Dentro dessa sistemática, este estudo avaliou o impacto do déficit hídrico na germinação de sementes na cultura de soja. Foram avaliados 12 tratamentos, com 4 repetições em cada, totalizando 50 sementes de soja por repetição, em que se comparou o rendimento das sementes tratadas industrialmente com standak top 200 ml a cada 100 kg de sementes (piraclostrobina 25g/l + tiofanato metílico 225g/l + fipronil 713g/l), com fungicidas em comparação com as sementes não tratadas. Os resultados obtidos evidenciaram que a ausência de água até 14 dias não impactou na produtividade e rendimento produtivo das plântulas. No entanto, após esse período, a ausência de umidade influenciou na qualidade fisiológica das sementes, comprometendo o stand final. As análises feitas acerca da influência da temperatura e umidade foram pouco significativas. Outra conclusão deste experimento foi que as sementes tratadas obtiveram um resultado aquém do obtido pelas sementes não tratadas. Pressupõe-se, a partir das análises feitas, que o tratamento empregado nas sementes tratadas industrialmente não tenha sido realizado de forma adequada, causando fitotoxidez na semente ou injúrias causadas no momento da inserção da mistura que comprometeram a qualidade fisiológica e química da semente tratada e, por essa razão, seu rendimento não sobrepujou o obtido pelas sementes não tratadas.
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Affiliation(s)
- S. B. Pinheiro
- UNIFOR - Centro Universitário de Formiga, Formiga, MG, Brasil
| | - H. J. S. Costa
- UNIFOR - Centro Universitário de Formiga, Formiga, MG, Brasil
| | - J. M. Freitas
- UNIFOR - Centro Universitário de Formiga, Formiga, MG, Brasil
| | - P. R. Frade
- UFLA - Universidade Federal de Lavras, Lavras, MG, Brasil
| | - A. A. Silva
- UNIFOR - Centro Universitário de Formiga, Formiga, MG, Brasil
| | - C. S. Pereira
- UFMT - Universidade Federal de Mato Grosso, Sinop, MT, Brasil
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Pereira CS, Lopes I, Abrantes I, Sousa JP, Chelinho S. Salinization effects on coastal ecosystems: a terrestrial model ecosystem approach. Philos Trans R Soc Lond B Biol Sci 2018; 374:20180251. [PMID: 30509924 PMCID: PMC6283962 DOI: 10.1098/rstb.2018.0251] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2018] [Indexed: 11/12/2022] Open
Abstract
In coastal areas, intrusion/irrigation with seawater can threaten biodiversity along with crop yields, and the leaching of salts from areas affected by these processes can increase the salinity of water bodies nearby. The aims of this study were to evaluate the effects of salinization on coastal soil ecosystems due to saline intrusion/irrigation. Terrestrial model ecosystems were used to simulate two soil salinization scenarios: (i) seawater intrusion and irrigation with distilled water and (ii) seawater intrusion and irrigation with saline water. Three sampling periods were established: T0-after acclimation period; T1-salinization effects; and T2-populations' recovery. In each sampling period, the abundance of nematodes, enchytraeids, springtails, mites and earthworms, and plant biomass were measured. Immediate negative effects on enchytraeid abundance were detected, especially at the higher level of saltwater via intrusion+irrigation. Eight weeks after the cessation of saline irrigation, the abundance of enchytraeids fully recovered, and some delayed effects were observed in earthworm abundance and plant biomass, especially at the higher soil conductivity level. The observed low capacity of soil to retain salts suggests that, particularly at high soil conductivities, nearby freshwater bodies can also be endangered. Under saline conditions similar to the ones assayed, survival of some soil communities can be threatened, leading to the loss of biodiversity.This article is part of the theme issue 'Salt in freshwaters: causes, ecological consequences and future prospects'.
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Affiliation(s)
- C S Pereira
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, P-3000 456 Coimbra, Portugal
| | - I Lopes
- Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - I Abrantes
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, P-3000 456 Coimbra, Portugal
| | - J P Sousa
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, P-3000 456 Coimbra, Portugal
| | - S Chelinho
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, P-3000 456 Coimbra, Portugal
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Pereira CS, Ribeiro H, Pérez-Cabezas B, Cardoso MT, Alegrete N, Gaspar A, Leão-Teles E, Macedo MF. The GM2 ganglioside inhibits iNKT cell responses in a CD1d-dependent manner. Mol Genet Metab 2018; 125:161-167. [PMID: 30030044 DOI: 10.1016/j.ymgme.2018.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 07/11/2018] [Accepted: 07/11/2018] [Indexed: 02/02/2023]
Abstract
Invariant natural killer T (iNKT) cells are a subset of T lymphocytes that recognize lipid antigens presented on CD1d molecules at the surface of antigen-presenting cells. GM2 is a glycosphingolipid abundant in cellular membranes and known to bind CD1d molecules, but the functional consequences of this binding are not completely clarified. Herein, we analyzed the effect of GM2 in iNKT cell activation. We found that culturing antigen-presenting cells or total peripheral blood mononuclear cells with GM2 did not induce activation of human iNKT cells, implying that this lipid is not antigenic for human iNKT cells. To investigate if this lipid could inhibit iNKT cell activation, we simultaneously incubated antigen-presenting cells with GM2 and the iNKT cell antigen α-Galactosylceramide (α-GalCer) and used them to stimulate iNKT cells. We found that GM2 reduced human iNKT cell activation in a dose-dependent manner. An explanation for this effect could be a direct competition of GM2 with antigenic lipids for CD1d binding. This was demonstrated by the use of an antibody (L363) that stains mouse CD1d:α-GalCer complexes, as in the presence of GM2 the amount of CD1d:α-GalCer complexes are reduced. We further explored the consequences of chronic GM2 overload on human iNKT cells by analyzing iNKT cells in patients diagnosed with GM2 gangliosidoses. We found that pediatric patients present a higher frequency of circulating CD4+ iNKT cells and concomitant lower frequency of CD4-CD8- iNKTs. A lower percentage of iNKT cells expressing the NK marker CD161 was also observed in these patients. In contrast, in two adult patients studied, no differences on iNKT cell phenotype were observed. Altogether, this study uncovers a new role for GM2 in the modulation of iNKT cell activation, thus strengthening the central role of lipid metabolism in iNKT cell biology.
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Affiliation(s)
- C S Pereira
- CAGE, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal; Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
| | - H Ribeiro
- CAGE, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal; Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal; Departamento de Química, Universidade de Aveiro, Aveiro, Portugal
| | - B Pérez-Cabezas
- CAGE, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal; Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
| | - M T Cardoso
- Centro de Referência de Doenças Hereditárias do Metabolismo (DHM) do Centro Hospitalar de São João, EPE, Medicina Interna, Porto, Portugal
| | - N Alegrete
- Centro de Referência de Doenças Hereditárias do Metabolismo (DHM) do Centro Hospitalar de São João, EPE, Ortopedia, Porto, Portugal
| | - A Gaspar
- Centro de Referência para as Doenças Hereditárias do Metabolismo (DHM) do Centro Hospitalar Lisboa Norte (CHLN), Lisboa, Portugal
| | - E Leão-Teles
- Centro de Referência de Doenças Hereditárias do Metabolismo (DHM) do Centro Hospitalar de São João, EPE, Pediatria, Porto, Portugal
| | - M F Macedo
- CAGE, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal; Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal; Departamento de Ciências Médicas, Universidade de Aveiro, Aveiro, Portugal.
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Soares JP, Klein D, Ximenes M, Pereira CS, Antunes EC, Dias L, Borgatto A, Cardoso M, Bolan M. Mouth Breathing and Prevalence of Sleep Bruxism among Preschoolers aged 2 to 5 years. Pesqui bras odontopediatria clín integr 2018. [DOI: 10.4034/pboci.2018.181.46] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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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Deng S, Kain L, Pereira CS, Mata S, Macedo MF, Bendelac A, Teyton L, Savage PB. Psychosine variants as antigens for natural killer T cells. Chem Sci 2016; 8:2204-2208. [PMID: 28507675 PMCID: PMC5408565 DOI: 10.1039/c6sc04218j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 09/20/2016] [Accepted: 12/07/2016] [Indexed: 12/22/2022] Open
Abstract
Natural killer T (NKT) cells play a central role in the interface between innate and adaptive immunity, and alpha-galactosylceramide was recently shown to be an endogenous antigen for these cells. The source of alpha-galactosylceramide has not yet been determined; however, in vivo degradation of alpha-galactosylceramide involves generation of alpha-psychosine (alpha-galactosylsphingosine). Alpha-psychosine stimulates cytokine release from NKT cells and constitutes an endogenous antigen for these cells. Alpha-psychosine contains a single lipid chain, while most antigens for NKT cells have two lipid chains, and we have investigated if other glycolipids with one lipid chain, derived from know antigens for NKT cells, stimulate cytokine release from NKT cells. Only psychosine variants derived from the most potent NKT cell antigens cause stimulation, and this stimulation occurs in vitro as well as in vivo. Truncated forms of weak antigens for NKT cells are not stimulatory.
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Affiliation(s)
- S Deng
- Department of Chemistry and Biochemistry , Brigham Young University , Provo , UT84602 , USA .
| | - L Kain
- Department of Immunology , The Scripps Research Institute , La Jolla , CA 92037 , USA
| | - C S Pereira
- Instituto de Investigação e Inovação em Saúde , Universidade do Porto , Portugal.,IBMC - Instituto de Biologia Molecular e Celular , Universidade do Porto , Porto , Portugal
| | - S Mata
- Department of Chemistry and Biochemistry , Brigham Young University , Provo , UT84602 , USA .
| | - M F Macedo
- Instituto de Investigação e Inovação em Saúde , Universidade do Porto , Portugal.,IBMC - Instituto de Biologia Molecular e Celular , Universidade do Porto , Porto , Portugal.,Department of Medical Sciences , University of Aveiro , Aveiro , Portugal
| | - A Bendelac
- Committee on Immunology and Department of Pathology , Howard Hughes Medical Institute , University of Chicago , Chicago , IL 60637 , USA
| | - L Teyton
- Department of Immunology , The Scripps Research Institute , La Jolla , CA 92037 , USA
| | - P B Savage
- Department of Chemistry and Biochemistry , Brigham Young University , Provo , UT84602 , USA .
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Acosta-Zaldívar M, Andrés MT, Rego A, Pereira CS, Fierro JF, Côrte-Real M. Human lactoferrin triggers a mitochondrial- and caspase-dependent regulated cell death in Saccharomyces cerevisiae. Apoptosis 2015; 21:163-73. [DOI: 10.1007/s10495-015-1199-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Pereira CS, Lopes I, Sousa JP, Chelinho S. Effects of NaCl and seawater induced salinity on survival and reproduction of three soil invertebrate species. Chemosphere 2015; 135:116-122. [PMID: 25930052 DOI: 10.1016/j.chemosphere.2015.03.094] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 11/04/2014] [Revised: 02/27/2015] [Accepted: 03/25/2015] [Indexed: 06/04/2023]
Abstract
The increase of global mean temperature is raising serious concerns worldwide due to its potential negative effects such as droughts and melting of glaciers and ice caps leading to sea level rise. Expected impacts on soil compartment include floodings, seawater intrusions and use of saltwater for irrigation, with unknown effects on soil ecosystems and their inhabitants. The present study aimed at evaluating the effects of salinisation on soil ecosystems due to sea level rise. The reproduction and mortality of three standard soil invertebrate species (Folsomia candida, Enchytraeus crypticus, Hypoaspis aculeifer) in standard artificial OECD soil spiked with serial dilutions of seawater/gradient of NaCl were evaluated according to standard guidelines. An increased sensitivity was observed in the following order: H. aculeifer≪E. crypticus≈F. candida consistent with the different exposure pathways: springtails and enchytraeids are exposed by ingestion and contact while mites are mainly exposed by ingestion due to a continuous and thick exoskeleton. Although small differences were observed in the calculated effect electrical conductivity values, seawater and NaCl induced the same overall effects (with a difference in the enchytraeid tests where a higher sensitivity was found in relation to NaCl). The adverse effects described in the present study are observed on soils not considered saline. Therefore, the actual limit to define saline soils (4000 μS cm(-1)) does not reflect the existing knowledge when considering soil fauna.
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Affiliation(s)
- C S Pereira
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal.
| | - I Lopes
- Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - J P Sousa
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal
| | - S Chelinho
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, 3000-456 Coimbra, Portugal
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Pereira CS, Soares da Costa D, Teixeira J, Pereira S. Organ-specific distribution and subcellular localisation of ascorbate peroxidase isoenzymes in potato (Solanum tuberosum L.) plants. Protoplasma 2005; 226:223-30. [PMID: 16333579 DOI: 10.1007/s00709-005-0120-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2004] [Accepted: 02/24/2005] [Indexed: 05/05/2023]
Abstract
Ascorbate peroxidase (EC 1.11.1.11), a heme-containing homodimeric protein, is a hydrogen peroxide-scavenging enzyme, playing an important role in plants in order to protect them from oxidative stress, thus adverting cellular damage. Several ascorbate peroxidase isoenzymes have been reported but the understanding of their physiological role still depends on a better knowledge of their precise localisation within plant organs. Immunocytochemistry techniques were performed in order to elucidate the peroxisomal and cytosolic ascorbate peroxidase distribution within tissues of leaves and sprouts of potato plants. The peroxisomal isoenzyme was found to have a broad distribution in sprouts, but a differential one in leaves, being restricted to the spongy parenchyma. This differential expression may be associated to the mesophyll asymmetry and the diverse physiological processes that occur in it. The cytosolic isoenzyme was not detected in leaves under the used conditions, probably because it is present in low amounts in these tissues. The results obtained in sprouts were at least curious: cytosolic ascorbate was found to be adjacent to the amyloplasts. Given these results, it is possible to state that apart from their similarity, these two isoenzymes reside in different organelles and seem to take part in different physiological processes as suggested by their organ- and tissue-specific distribution.
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Affiliation(s)
- C S Pereira
- Plant Functional Biology Department, Institute for Cell and Molecular Biology, University of Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal
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Peixoto MGCD, Pereira CS, Bergmann JAG, Penna VM, Fonseca CG. Genetic parameters of multiple ovulation traits in Nellore females. Theriogenology 2004; 62:1459-64. [PMID: 15451254 DOI: 10.1016/j.theriogenology.2004.02.019] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2003] [Accepted: 02/17/2004] [Indexed: 10/26/2022]
Abstract
Variability in superovulatory response is a limiting factor for animal breeding programs using Multiple Ovulation and Embryo Transfer (MOET) nucleus schemes. To evaluate genetic factors affecting superovulory response, 1036 multiple ovulation records from 475 Brazilian Nellore embryo donors (daughters of 139 sires), 2.2-20.5-year olds, were analyzed. Traits used to evaluate superovulatory response included the number of palpable corpora lutea (CL), the total number of recovered structures (RS), and the number of viable embryos (VE). Two data sets were used: data from the first flush only or data from the first three flushes. Genetic parameter estimations were carried out using Restricted Maximum Likelihood (REML) methodology, with single- and multiple-trait animal models. According to the data set used, heritability estimates ranged from 0.47 to 0.57 for CL, from 0.20 to 0.65 for VE, and from 0 to 0.34 for RS, and were higher for the data set that used only the first flushing only. For the first flush, genetic correlations were 0.43 between CL and SF, 0.01 between CL and VE, and 0.73 between SF and VE. Repeatability estimates ranged from 0.47 to 0.51. In conclusion, the use of data from the first flush only might result in better estimates of genetic parameters for MOET traits in Nellore females. Furthermore, moderate to high values for repeatability suggested that selection for a high response to superovulation could be made after the first flush.
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Affiliation(s)
- M G C D Peixoto
- Departamento de Biologia Geral do, Instituto de Ciências Biológicas da, Universidade Federal de Minas Gerais, Caixa Postal 486, 31.270-901, Belo Horizonte, MG, Brazil.
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Jackson PA, Galinha CI, Pereira CS, Fortunato A, Soares NC, Amâncio SB, Pinto Ricardo CP. Rapid deposition of extensin during the elicitation of grapevine callus cultures is specifically catalyzed by a 40-kilodalton peroxidase. Plant Physiol 2001; 127:1065-1076. [PMID: 11706187 DOI: 10.1104/pp.010192] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Elicitation or peroxide stimulation of grape (Vitis vinifera L. cv Touriga) vine callus cultures results in the rapid and selective in situ insolubilization of an abundant and ionically bound cell wall protein-denominated GvP1. Surface-enhanced laser desorption/ionization/time of flight-mass spectrometry analysis, the amino acid composition, and the N-terminal sequence of purified GvP1 identified it as an 89.9-kD extensin. Analysis of cell walls following the in situ insolubilization of GvP1 indicates large and specific increases in the major amino acids of GvP1 as compared with the amino acids present in salt-eluted cell walls. We calculate that following deposition, covalently bound GvP1 contributes up to 4% to 5% of the cell wall dry weight. The deposition of GvP1 in situ requires peroxide and endogenous peroxidase activity. Isoelectric focusing of saline eluates of callus revealed only a few basic peroxidases that were all isolated or purified to electrophoretic homogeneity. In vitro and in situ assays of extensin cross-linking activity using GvP1 and peroxidases showed that a 40-kD peroxidase cross-linked GvP1 within minutes, whereas other grapevine peroxidases had no significant activity with GvP1. Internal peptide sequences indicated this extensin peroxidase (EP) is a member of the class III peroxidases. We conclude that we have identified and purified an EP from grapevine callus that is responsible for the catalysis of GvP1 deposition in situ during elicitation. Our results suggest that GvP1 and this EP play an important combined role in grapevine cell wall defense.
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Affiliation(s)
- P A Jackson
- Instituto de Tecnologia Química e Biológica, Apartado 127, 2781-901 Oeiras, Portugal
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Pereira CS, Cunha AM, Reis RL, Vázquez B, San Román J. New starch-based thermoplastic hydrogels for use as bone cements or drug-delivery carriers. J Mater Sci Mater Med 1998; 9:825-833. [PMID: 15348948 DOI: 10.1023/a:1008944127971] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The development of new biodegradable hydrogels, based on corn starch/cellulose acetate blends, produced by free-radical polymerization with methyl methacrylate monomer (MMA) and/or an acrylic acid monomer (AA), is reported. The polymerization was initiated by a redox system consisting of a benzoyl peroxide and 4-dimethlyaminobenzyl alcohol at low temperature. These hydrogels may constitute an alternative to the materials currently used as bone cements or drug-delivery carriers. Swelling studies were carried out, as a function of pH and temperature, in buffered solutions. The xerogels were further characterized by Fourier transform-infrared spectroscopy. Tensile and compression tests, and dynamic mechanical thermal analysis were used to assess the mechanical performance of the developed materials. The fracture surfaces were observed by scanning electron microscopy. The developed materials are sensitive to the pH, showing a clear reversible transition in a relatively narrow interval of pH, which is just in the range of physiological conditions. These properties make the materials developed in this study very promising for biomedical applications. Fickian-type diffusion is the mechanism predominant in these systems, except for the composition with a higher concentration of AA, that corresponds to the most desirable kinetical behavior for controlled release (case II-transport mechanism). Furthermore, the results obtained in the mechanical tests are in the range of those reported for typical PMMA bone cements, showing that it is possible to develop partially degradable cements with an adequate mechanical behavior.
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Affiliation(s)
- C S Pereira
- INEB-Institute for Biomedical Engineering, Biomaterials Laboratory, Rua do Campo Alegre 823, 4150 Porto, Portugal
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Antunes F, Carvalho C, Tavares L, Botas J, Forte M, del Rio AM, Dutschmann L, Costa A, Abranches P, Pereira CS. Visceral leishmaniasis recrudescence in a patient with AIDS. Trans R Soc Trop Med Hyg 1987; 81:595. [PMID: 3445340 DOI: 10.1016/0035-9203(87)90419-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- F Antunes
- Departamento de Doenças Infecciosas e Parasitárias, Faculdade de Medicina de Lisboa, Hospital de Santa Maria, Lisbon, Portugal
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Lima SV, Pereira CS. Giant diverticulum of the anterior urethra. Br J Urol 1984; 56:335-6. [PMID: 6443561 DOI: 10.1111/j.1464-410x.1984.tb05405.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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