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Silva RB, Ribeiro P, Silva SG, Martins CL. Pre-task Intrinsic Cortical Activity in Novice and Experienced Military Specialists: A Cross-sectional Study. Mil Med 2023; 188:e3514-e3521. [PMID: 37464920 DOI: 10.1093/milmed/usad257] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 04/11/2023] [Accepted: 06/29/2023] [Indexed: 07/20/2023] Open
Abstract
INTRODUCTION Neuroscience studies brain dynamics through the analysis of electrical signals. Cortical activity estimated by electroencephalography brings accurate information about perceptions of human behavior. The examination of resting states in relation to subsequent behaviors indicates that intrinsic cortical activity (ICA) has implications for decision-making processes, especially when inserted in the context of military activities and associated with stress. The objective of this study was to compare the absolute alpha power (AAP) in the ICA in the pre-task moment of novice specialized military (NG) with experienced (ExpG), associating with the level of stress. MATERIALS AND METHODS This was a cross-sectional, observational study with 19 military personnel (32.1 years old), divided into NG (10) and ExpG (9). The ICA was the outcome variable, with the level of stress and the time of specialization in military tasks as the exposure variables. ICA analysis were carried out based on the cortical areas to compare the ICA of the NG with that of the ExpG. The association of stress level with ICA was estimated by linear regression via linear models. RESULTS There was a significant difference in almost all cortical areas, and the averages were always higher in Exp. The high stress level was associated with greater AAP both for the NG and for the ExpG, and at the medium level, the AAP was obtained, varying according to each cortical area. CONCLUSION The AAP in ExpG was significantly higher than that in NG, indicating a lower level of cortical activity and greater efficiency in sensory, motor, and visual tasks.
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Affiliation(s)
- R B Silva
- Military Operations Support Division, Brazilian Army Research Institute of Physical Training, João Luiz Alves Street (without number), Rio de Janeiro 22291090, Brazil
| | - Pedro Ribeiro
- Brain Mapping and Sensory-Motor Integration Laboratory (LabMCISM), Rio de Janeiro 22290140, Brazil
- Graduate Program in Psychiatry and Mental Health (IPUB/UFRJ), Rio de Janeiro 22290140, Brazil
| | - Siqueira Grace Silva
- Health and Quality of life division, Brazilian Army Research Institute of Physical Training, João Luiz Alves Street, Rio de Janeiro 22011090, Brazil
| | - Cx Lilian Martins
- Brain Mapping and Sensory-Motor Integration Laboratory (LabMCISM), Rio de Janeiro 22290140, Brazil
- Graduate Program in Psychiatry and Mental Health (IPUB/UFRJ), Rio de Janeiro 22290140, Brazil
- Research Support Division, Brazilian Army Research Institute of Physical Training, Rio de Janeiro 22091090, Brazil
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Nóbrega S, Monteiro MP, Pereira-da-Silva L, Pereira SS, Hartmann B, Holst JJ, Barbosa Silva R, Cordeiro-Ferreira G. Congenital Glucagon-like Peptide-1 Deficiency in the Pathogenesis of Protracted Diarrhea in Mitchell-Riley Syndrome. J Clin Endocrinol Metab 2021; 106:1084-1090. [PMID: 33382423 DOI: 10.1210/clinem/dgaa916] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Indexed: 11/19/2022]
Abstract
CONTEXT Mitchell-Riley syndrome due to RFX6 gene mutations is characterized by neonatal diabetes and protracted diarrhea. The RFX6 gene encodes a transcription factor involved in enteroendocrine cell differentiation required for beta-cell maturation. In contrast to the pathway by which RFX6 mutations leads to diabetes, the mechanisms underlying protracted diarrhea are unknown. OBJECTIVE To assess whether glucagon-like peptide-1 (GLP-1) was involved in the pathogenesis of Mitchell-Riley syndrome protracted diarrhea. METHODS Two case report descriptions. in a tertiary pediatric hospital. "Off-label" treatment with liraglutide. We describe 2 children diagnosed with Mitchell-Riley syndrome, presenting neonatal diabetes and protracted diarrhea. Both patients had nearly undetectable GLP-1 plasma levels and absence of GLP-1 immunostaining in distal intestine and rectum. The main outcome was to evaluate whether GLP-1 analogue therapy could improve Mitchell-Riley syndrome protracted diarrhea. RESULTS "Off-label" liraglutide treatment, licensed for type 2 diabetes treatment in children, was started as rescue therapy for protracted intractable diarrhea resulting in rapid improvement during the course of 12 months. CONCLUSION Congenital GLP-1 deficiency was identified in patients with Mitchell-Riley syndrome. The favorable response to liraglutide further supports GLP-1 involvement in the pathogenesis of protracted diarrhea and its potential therapeutic use.
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Affiliation(s)
- Sara Nóbrega
- Special Nutrition and Respiratory Care Unit, Hospital Dona Estefânia, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
- Gastroenterology and Hepatology Unit, Hospital Dona Estefânia, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
- Comprehensive Health Research Centre (CHRC), Medicine of Woman, Childhood and Adolescence, NOVA Medical School | Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal
| | - Mariana P Monteiro
- Endocrine, Cardiovascular & Metabolic Research, Unit for Multidisciplinary Research in Biomedicine (UMIB), University of Porto, Porto, Portugal
- Department of Anatomy, Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Luís Pereira-da-Silva
- Comprehensive Health Research Centre (CHRC), Medicine of Woman, Childhood and Adolescence, NOVA Medical School | Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal
- NICU, Hospital Dona Estefânia, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
| | - Sofia S Pereira
- Endocrine, Cardiovascular & Metabolic Research, Unit for Multidisciplinary Research in Biomedicine (UMIB), University of Porto, Porto, Portugal
- Department of Anatomy, Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
- Instituto de Investigação e Inovação em Saúde (I3S), Universidade do Porto, Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Portugal
| | - Bolette Hartmann
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jens J Holst
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Raul Barbosa Silva
- Special Nutrition and Respiratory Care Unit, Hospital Dona Estefânia, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
| | - Gonçalo Cordeiro-Ferreira
- Special Nutrition and Respiratory Care Unit, Hospital Dona Estefânia, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
- Gastroenterology and Hepatology Unit, Hospital Dona Estefânia, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
- Comprehensive Health Research Centre (CHRC), Medicine of Woman, Childhood and Adolescence, NOVA Medical School | Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal
- NICU, Hospital Dona Estefânia, Centro Hospitalar Universitário de Lisboa Central, Lisbon, Portugal
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Silva RB, Aldoradin-Cabeza H, Eslick GD, Phu S, Duque G. The Effect of Physical Exercise on Frail Older Persons: A Systematic Review. J Frailty Aging 2018; 6:91-96. [PMID: 28555710 DOI: 10.14283/jfa.2017.7] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Physical exercise is one of the most effective non-pharmacological interventions aimed to improve mobility and independence in older persons. The effect of physical exercise and the most effective type of exercise in frail older persons remain undefined. This systematic review examines the effectiveness of physical exercise on frail older persons. Seven databases were search for randomized control trials which assessed the effect of exercise on participants who were identified as being frail using specific and validated criteria. Nine articles were reviewed from eight studies, from which seven used a validated definition of frailty. Based on the articles analyzed in our systematic review, the evidence suggests that exercise has a positive effect on various measures used to determine frailty including cognition, physical functioning, and psychological wellbeing. Some studies revealed that exercise may prevent or delay the onset of frailty which can enhance quality of life in older adults. Despite the evidence for exercise interventions in frail older adults, it appears that there is no clear guidance regarding the most effective program variables. The reviewed studies were generally long in duration (≥6 months) with sessions lasting around 60 minutes performed three or more times per week, including multicomponent exercises. In conclusion, although exercise interventions appear to be effective in managing the various components of frailty and preventing/delaying the onset of frailty, the most effective exercise program in this population remains unidentified.
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Affiliation(s)
- R B Silva
- Prof. Gustavo Duque, MD, PhD, FRACP, Australian Institute for Musculoskeletal Sciences (AIMSS), The University of Melbourne and Western Health, Level 3 WCHRE Building, 176 Furlong Road, St Albans VIC 3021, Tel: +61 3 8395 8121; Facsimile: +61 3 8395 8258 ,
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Pereira AG, Silva RB, Dias MM, Penteado-Dias AM. Study on the Hymenoptera parasitoid associated with Lepidoptera larvae in reforestation and agrosilvopastoral systems at Fazenda Canchim (Embrapa Pecuária Sudeste) São Carlos, SP, Brazil. BRAZ J BIOL 2015; 75:783-9. [PMID: 26602340 DOI: 10.1590/1519-6984.21913] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 07/04/2014] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to characterize the local fauna of Hymenoptera parasitoids associated with Lepidoptera larvae in areas of reforestation and agrosilvopastoral systems at Fazenda Canchim (Embrapa Pecuária Sudeste, São Carlos, SP, Brazil). Lepidoptera larvae collected with entomological umbrella were kept in the laboratory until emergence of adults or their parasitoids. From those collected in the agrosilvopastoral system, emerged 267 specimens of hymenopteran parasitoids belonging to 16 genera: Braconidae, Agathidinae (Alabagrus), Braconinae (Bracon), Microgastrinae (Cotesia, Diolcogaster, Glyptapanteles, Pholetesor and Protapanteles), Orgilinae (Orgilus); Ichneumonidae, Campopleginae (Casinaria, Charops and Microcharops); Chalcididae, Chalcidinae (Brachymeria and Conura); Eulophidae, Entedoninae (Horismenus), Eulophinae (Elachertus and Euplectrus). From the Lepidoptera larvae collected in the reforestation, emerged 68 specimens of hymenopteran parasitoids, belonging to 8 genera: Chalcididae, Chalcidinae (Conura); Ichneumonidae, Pimplinae (Neotheronia), Campopleginae (Charops and Microcharops) and Braconidae, Microgastrinae (Apanteles, Diolcogaster, Distatrix, Glyptapanteles and Protapanteles). The results of this study suggest the occurrence of a wide variety of Hymenoptera parasitoids in the studied environments.
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Affiliation(s)
- A G Pereira
- Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos, São Carlos, SP, Brazil
| | - R B Silva
- Departamento de Engenharia Ambiental e Sanitária, Faculdades Santo Agostinho de Sete Lagoas, Sete Lagoas, MG, Brazil
| | - M M Dias
- Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos, São Carlos, SP, Brazil
| | - A M Penteado-Dias
- Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos, São Carlos, SP, Brazil
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Oliveira CM, Camões MF, Bigus P, Fachado AA, Silva RB. Validation of atmospheric aerosols parallel sampling in a multifold device. Environ Monit Assess 2015; 187:380. [PMID: 26013655 DOI: 10.1007/s10661-015-4615-2] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 05/19/2015] [Indexed: 06/04/2023]
Abstract
In this work, particulate matter was collected using an active sampling system consisting of a PM10 (<10 μm) inlet coupled to a multifold device containing six channels, connected to a vacuum pump. Each channel was equipped with a filter holder fitted with adequately chosen filters. The system was fixed on a metallic structure, which was placed on the roof of the laboratory building, at the Faculty of Sciences, in Lisbon. Sampling took place under flow-controlled conditions. Aerosols were extracted from the filters with water, in defined conditions, and the water-soluble fraction was quantified by ion chromatography (IC) for the determination of inorganic anions (Cl(-), NO3 (-) and SO4 (2-)). Equivalent sampling through the various channels was validated. Validation was based on the metrological compatibility of the content results for the various filters. Ion masses are metrologically equivalent when their absolute difference is smaller than the respective expanded uncertainty. When this condition is verified, the studied multifold device produces equivalent samples.
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Affiliation(s)
- C M Oliveira
- Centro de Química Estrutural-Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal,
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Silva RB, Cruz I, Penteado-Dias AM. First report of Dolichozele koebelei Viereck, 1911 (Hymenoptera: Braconidae) on larvae of Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) in maize (Zea mays L.) under different cropping systems. BRAZ J BIOL 2015; 74:S218-22. [PMID: 25627388 DOI: 10.1590/1519-6984.00413] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 07/23/2013] [Indexed: 11/22/2022] Open
Abstract
In the context of the modern agriculture, pest control is important in order to increase productivity in maize (Zea mays L.). However, this control should be done rationally, prioritising environmentally safer methods such as biological control. This paper aims to report the occurrence of Dolichozele koebelei Viereck, 1911 (Hymenoptera: Braconidae) in Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) larvae collected in maize subjected to different cropping systems. The experiment was conducted at the Centro Nacional de Pesquisa de Milho e Sorgo (CNPMS) in Sete Lagoas, Minas Gerais State, Brazil, using organic and conventional production. Ten plants were sampled from each of the 24 plots and for each production system, three times a week during the entire cycle of maize (variety BR 106). In the laboratory, larvae were distributed in individual rearing containers with artificial diet until the end of the biological cycle. An increased number of S. frugiperda larvae was observed in organic single crop maize; hence a higher percentage of S. frugiperda larvae parasitised by Hymenoptera and Diptera also occurred in the maize under this production system. Dolichozele koebelei had not yet been described in association with larvae of S. frugiperda. The percentage of parasitism of S. frugiperda larvae was high in both experiments, indicating the importance of natural control agents in reducing the population density of S. frugiperda, and especially the importance of an appropriate crop management.
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Affiliation(s)
- R B Silva
- Departamento de Ecologia e Biologia Evolutiva - DEBE, Universidade Federal de São Carlos - UFSCar, Programa de Pós-Graduação em Ecologia e Recursos Naturais, São Carlos, SP, Brazil
| | - I Cruz
- Laboratório de Criação de Insetos - Lacri, Embrapa Milho e Sorgo, Sete Lagoas, MG, Brazil
| | - A M Penteado-Dias
- Departamento de Ecologia e Biologia Evolutiva - DEBE, Universidade Federal de São Carlos - UFSCar, Programa de Pós-Graduação em Ecologia e Recursos Naturais, São Carlos, SP, Brazil
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Mendes LR, Silva RB, Bueno CFD, Couto FAP, Dias AN, Fernandes V, Faria Filho DE. The inclusion of coffee in commercial layer diets. Rev Bras Cienc Avic 2013. [DOI: 10.1590/s1516-635x2013000200010] [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] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- LR Mendes
- Universidade Federal de Minas Gerais, Brazil
| | - RB Silva
- Universidade Federal de Minas Gerais, Brazil
| | - CFD Bueno
- Universidade Federal de Minas Gerais, Brazil
| | - FAP Couto
- Universidade Federal de Minas Gerais, Brazil
| | - AN Dias
- Universidade Federal de Minas Gerais, Brazil
| | - V Fernandes
- Universidade Federal de Minas Gerais, Brazil
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8
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Silva RB, Cruz I, Zanuncio JC, Figueiredo MLC, Canevari GC, Pereira AG, Serrão JE. Biological aspects of Eriopis connexa (Germar) (Coleoptera: Coccinellidae) fed on different insect pests of maize (Zea mays L.) and sorghum [Sorghum bicolor L. (Moench.)]. BRAZ J BIOL 2013; 73:419-24. [DOI: 10.1590/s1519-69842013000200025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Accepted: 07/10/2012] [Indexed: 11/22/2022] Open
Abstract
Eriopis connexa (Germar) (Coleoptera: Coccinellidae) occurs in several countries of South America and its mass rearing is important for biological control programmes. This work evaluated biological aspects of E. connexa larva fed on eggs of Anagasta kuehniella (Zeller) (Lepidoptera: Pyralidae) and Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) frozen for one day, fresh eggs of Diatraea saccharalis (Fabricius) (Lepidoptera: Pyralidae), S. frugiperda newly-hatched caterpillars, nymphs of Rhopalosiphum maidis (Fitch) and Schizaphis graminum (Rondani) (Hemiptera: Aphididae). Duration of larva, pupa and larva to adult stages differed among prey offered, whereas the prepupa stage was similar. Larva, pupa, prepupa and larva to adult viabilities were equal or major of 87.5% in all prey, except for larva fed on newly-hatched larvae of S. frugiperda. Eriopis connexa has good adaptation to different prey corroborating its polyphagous feeding habit, which evidences the potential of this natural enemy for controlling corn and sorghum pests.
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Affiliation(s)
- RB Silva
- Universidade Federal de Viçosa – UFV, Brazil; Laboratório de Criação de Insetos – LACRI, Brazil
| | - I Cruz
- Laboratório de Criação de Insetos – LACRI, Brazil
| | - JC Zanuncio
- Universidade Federal de Viçosa – UFV, Brazil
| | | | - GC Canevari
- Universidade Federal de Viçosa – UFV, Brazil
| | - AG Pereira
- Universidade Federal de São Carlos – UFSCar, Brazil
| | - JE Serrão
- Universidade Federal de Viçosa – UFV, Brazil
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Silva RB, Cruz I, Figueiredo MLC, Pereira AG, Penteado-Dias AM. Occurrence and biology of Dinocampus coccinellae (Schrank, 1802) (Hymenoptera; Braconidae: Euphorinae) parasitising different species of Coccinellidae (Coleoptera) in Neotropical region. BRAZ J BIOL 2012; 72:215-9. [PMID: 22437405 DOI: 10.1590/s1519-69842012000100027] [Citation(s) in RCA: 6] [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] [Received: 01/26/2011] [Accepted: 03/28/2011] [Indexed: 11/22/2022] Open
Abstract
Surveys on Coccinellidae (Coleoptera) in Sete Lagoas city, Minas Gerais state, Brazil, indicated the parasitism of adults of the species Coleomegilla maculata De Geer, 1775, Eriopis connexa (Germar, 1824) and Olla v-nigrum (Mulsant, 1866), by Dinocampus coccinellae (Schrank, 1802) (Hymenoptera; Braconidae: Euphorinae). Since then, the parasitoid have been maintained in its original hosts at the Insect Rearing Laboratory - LACRI of the Brazilian Agricultural Research Institution - Embrapa Milho e Sorgo. Besides the citation of occurrence in Brazil, this work also indicates the parasitoid preference for C. maculata (70% of parasitism), followed by O. v-nigrum (43.3% of parasitism) and E. connexa (36.7% of parasitism). Total life cycle of D. coccinellae was longer on C. maculata (32.4 ± 0.48 days), compared to O. v-nigrum (29.5 ± 0.49 days) and E. connexa (27.8 ± 0.4 days). Due to the relatively high percentage of field parasitism, D. coccinellae can reduce the efficiency of biological pest control by Coccinellidae predators especially in the case of C. maculata.
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Affiliation(s)
- RB Silva
- Universidade Federal de São Carlos, Brazil; Embrapa Milho e Sorgo, Brazil
| | - I Cruz
- Embrapa Milho e Sorgo, Brazil
| | | | - AG Pereira
- Universidade Federal de São Carlos, Brazil
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Copetti MV, Santurio JM, Boeck AAP, Silva RB, Bergermaier LA, Lubeck I, Leal ABM, Leal AT, Alves SH, Ferreiro L. Agalactia in mares fed with grain contaminated with Claviceps purpurea. Mycopathologia 2003; 154:199-200. [PMID: 12206321 DOI: 10.1023/a:1016379302055] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 11/12/2022]
Abstract
This article reports an outbreak of intoxication of female horses with Claviceps purpurea in southern Brazil. The outbreak affected twelve pregnant mares which were fed with black oat (Avena strigosa) during the pre-delivery period. Underdevelopment of the mammary gland in the pre-delivery period resulting in post-delivery agalactia was the most pronounced finding. These mares delivered weak and unviable foals, which showed no suckling reflex and died within a few hours of birth. Laboratory analysis of oat samples fed to the animals resulted in the identification of Claviceps purpurea sclerotia. The fungus was identified in 0.22% of the examined seeds.
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Affiliation(s)
- M V Copetti
- Department of Preventive Veterinary Medicine, Universidade Federal de Santa Maria, RS, Brazil
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Mortara RA, Procópio DO, Barros HC, Verbisck NV, Andreoli WK, Silva RB, da Silva S. Features of host cell invasion by different infective forms of Trypanosoma cruzi. Mem Inst Oswaldo Cruz 2000; 94 Suppl 1:135-7. [PMID: 10677700 DOI: 10.1590/s0074-02761999000700014] [Citation(s) in RCA: 16] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Through its life cycle from the insect vector to mammalian hosts Trypanosoma cruzi has developed clever strategies to reach the intracellular milieu where it grows sheltered from the hosts' immune system. We have been interested in several aspects of in vitro interactions of different infective forms of the parasite with cultured mammalian cells. We have observed that not only the classically infective trypomastigotes but also amastigotes, originated from the extracellular differentiation of trypomastigotes, can infect cultured cells. Interestingly, the process of invasion of different parasite infective forms is remarkably distinct and also highly dependent on the host cell type.
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Affiliation(s)
- R A Mortara
- Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, 04023-062, Brasil.
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Silva RB, Collins KE, Collins CH. Effects in high-performance liquid chromatography of a high pH in the mobile phase on poly(methyloctylsiloxane) immobilized by gamma-radiation on titanium-grafted silica. J Chromatogr A 2000; 869:137-41. [PMID: 10720232 DOI: 10.1016/s0021-9673(99)01237-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [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]
Abstract
Effects of high-pH environments on a stationary phase prepared by gamma-radiation immobilization of poly(methyloctylsiloxane) on titanium-grafted silica were investigated by HPLC testing with standard sample mixtures. The HPLC parameters indicate good stationary phase stability to 10000 column volumes each of mobile phases with pH of 7, 9 and 12. At pH 13, the efficiency decreases slowly, although reasonably good separations are still possible until increasing flow resistance no longer allows easy passage of the mobile phase.
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Affiliation(s)
- R B Silva
- Instituto de Química, Universidade Estadual de Campinas, (S.P.), Brazil
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Abstract
Community genetics is a new discipline which aims to provide genetic services to the community as a whole. As a science, community genetics encompasses all research needed to develop and evaluate its application. There is no question that the development of community genetics is necessary in Brazil. The implementation of such programs in our country, especially for hemoglobinopathies, has been recommended by the World Health Organization and other international organizations. Apart from the need for and appeal of community genetics programs, some aspects require serious review. This article discusses various cultural, social, psychological, and economic factors that can make genetic screening an invasion of individual privacy.
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Affiliation(s)
- A S Ramalho
- Departamento de Genética Médica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, C. P. 6111, Campinas, SP 13081-970, Brasil.
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Silva RB. [Tribute to Dr. Francisco Puelma Tupper and Aureliano Oyarzún (author's transl)]. Rev Med Chil 1979; 107:272-83. [PMID: 382324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Silva RB. [Training of pathologists: past, present and future (author's transl)]. Rev Med Chil 1978; 106:645-51. [PMID: 364585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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