Search | SciELO

Need help?

Add field +

Search history

No documents were found for your search

Results: 13

au:Casella, S.

Filters

Collection

All
Brazil

13

Journal + Options

All
Journal of Microwaves, Optoelectronics and Electromagnetic Applications

3
Clinics

2
Arquivo Brasileiro de Medicina Veterinária e Zootecnia

1
Arquivos Brasileiros de Cardiologia

1
Arquivos de Neuro-Psiquiatria

1
Iheringia. Série Zoologia

1
Journal of Aerospace Technology and Management

1
Revista Brasileira de Engenharia Agrícola e Ambiental

1
Revista do Hospital das Clínicas

1
Sba: Controle & Automação Sociedade Brasileira de Automatica

1

Show all...

Language

All
Portuguese

3

Publication Year + Options

All
2012

2
2021

2
1998

1
2000

1
2002

1
2006

1
2008

1
2010

1
2013

1
2020

1
2022

1

SciELO Thematic Areas + Options

All
Health Sciences

5
Engineering

4
Agricultural Sciences

2
Biological Sciences

1
Exact and Earth Sciences

1

Show all...

WoS Subject Categories + Options

All
Engineering

5
Electrical

3
Electronic

3
General

3
Internal

3
Medicine

3
Optics

3
Sciences

2
Systems

2
Aerospace

1
Agricultural

1
Automation

1
Cardiac

1
Cardiovascular

1
Control

1

Show all...

WoS Citation Index + Options

All
Science Citation Index Expanded

6
Social Sciences Citation Index

1

Citables and non citables

All
Citable

13

Type of Literature + Options

All
Article

12
Case report

1

Order by

Page of 1 Next

Select this page

Print | Send to email | Export |

Facebook
Twitter
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

0 Selected itens

List all
Erase all

A 2.4 GHz Coplanar Solar Cell Patch Antenna with a Semi-Analytical Evaluation of Temperature Effects
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Cambero, Eduardo V. V.

; Silva, Vinicius S.

; Paz, Humberto P.

; Doria, Renan T.

; Casella, Ivan R. S.

; Capovilla, Carlos E.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

Journal Metrics
- Sobre o periódico
- SciELO Analytics

mar 2022, Volume 21 N. 1 Pages 194 - 206

Abstract: En | Text: En | PDF: En

Abstract Solar cells integrated with antennas have aroused scientific interest as an attractive energy source alternative in low power devices for IoT and Wireless Sensor Network applications. Since the space for all components in the systems is scarce, different integration ideas have been proposed in this field. However, further analysis of the performance of photovoltaic modules used as structural components of antennas is still lacking. In this context, this work experimentally extracts the necessary parameters to create an equivalent circuit model of a modified solar cell used as a radiator of a 2.4 GHz coplanar patch antenna. The obtained model is then used in the numerical characterization of the Current- Voltage (I-V) curves under temperature variations. Antenna design and performance are described, and the physical modifications of a commercial solar cell used in the prototype are presented. The I-V curves were generated for temperatures ranging from 243 to 325 K. The obtained simulation results within this temperature range showed a 150 mV shift of the optimal operation point, decreasing in approximately 20 mW the supported power with the temperature rise. A predictive methodology is introduced to estimate the possible values for the fill factor, energy conversion efficiency, and current density in a modified solar cell under temperature variations, allowing a fully operational photovoltaic antenna design.

https://doi.org/10.1590/2179-10742022v21i11254187

IEEE 802.11b/g Practical Assessment Using a Low-Cost Quasi-Yagi Rectenna for Indoor RF Energy Harvesting
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Silva, Vinícius S.

; Paz, Humberto P.

; Cambero, Eduardo V. V.

; Vicentini, Ricardo M.

; Martins, Ricardo Q.

; Capovilla, Carlos E.

; Casella, Ivan R. S.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

Journal Metrics
- Sobre o periódico
- SciELO Analytics

mar 2021, Volume 20 N. 1 Pages 143 - 157

Abstract: En | Text: En | PDF: En

Abstract This article presents an experimental analysis of the use of signals transmitted by Wireless Local Area Networks (WLAN) based on the IEEE 802.11b/g standards for Radio Frequency Energy Harvesting (RFEH) applications in indoor environments employing a Quasi-Yagi Rectenna (QYR) topology. This analysis is a crucial point to distinguish the use of the IEEE 802.11b/g standards for ambient RFEH applications and contributes to the debate on the use of different types of energy available for free in modern society. For it, a dedicated setup, developed in a controlled environment to avoid any external interference, was built to carry out the programmed measurements. The results obtained indicate that IEEE 802.11b/g standards have great potential for applications in RFEH, with the IEEE 802.11b average power four times higher than IEEE 802.11g at the rectifier output.

https://doi.org/10.1590/2179-10.1590/2179-10742021v20i11052 300 downloads

Poor Sleep quality and health-related quality of life impact in adolescents with and without chronic immunosuppressive conditions during COVID-19 quarantine
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Helito, Alberto C.

; Lindoso, Livia

; Sieczkowska, Sofia M.

; Astley, Camilla

; Queiroz, Ligia B.

; Rose, Natalia

; Santos, Claudia Renata P.

; Bolzan, Thalis

; Peralta, Rita María I.A.

; Franco, Ruth R.

; Cominato, Louise

; Pereira, Rosa Maria R.

; Tannuri, Uenis

; Campos, Lucia Maria A.

; Lourenço, Benito

; Toma, Ricardo K.

; Medeiros, Karina

; Watanabe, Andréia

; Grangeiro, Patricia Moreno

; Farhat, Sylvia C.

; Casella, Caio B.

; Polanczyk, Guilherme V.

; Gualano, Bruno

; Silva, Clovis A.

; Sallum, Adriana M. E.

; Iraha, Amanda Y.

; Ihara, Bianca P.

; Mazzolani, Bruna C.

; Martinez, Claudia A.

; Strabelli, Claudia A. A.

; Fonseca, Claudia B.

; Lima, Dandara C. C.

; Setoue, Debora N. D.

; Roz, Deborah F. P.

; Smaira, Fabiana I.

; Roschel, Hamilton

; Miyatani, Helena T.

; Marques, Isabela G.

; Oba, Jane

; Ferreira, Juliana C. O.

; Simon, Juliana R.

; Kozu, Katia

; Saccani, Ligia P.

; Martiniano, Lorena V. M.

; Miranda, Luana C. A.

; Silva, Luiz E. V.

; Laurentino, Moisés F.

; Aikawa, Nadia E.

; Sakita, Neusa K.

; Tanigava, Nicolas Y.

; Pereira, Paulo R. A.

; Palmeira, Patrícia

; Angelo, Simone S.

; Lavorato, Sofia S. M.

; Bernardes, Tamires M.

; Franco, Tathiane C.

; Viana, Vivianne S. L.

; Barros, Vera P. M. F. R.

; Zheng, Yingying

Clinics

Journal Metrics
- Sobre o periódico
- SciELO Analytics

2021, Volume 76 elocation e3501

Abstract: En | Text: En | PDF: En

OBJECTIVE: To assess the possible factors that influence sleep quality in adolescents with and without chronic immunosuppressive conditions quarantined during the coronavirus disease 2019 (COVID-19) pandemic. METHODS: This cross-sectional study included 305 adolescents with chronic immunocompromised conditions and 82 healthy adolescents. Online surveys were completed, which included questions on socio-demographic data and self-rated healthcare routine during COVID-19 quarantine and the following validated questionnaires: the Pittsburgh Sleep Quality Index (PSQI), Pediatric Quality of Life Inventory 4.0 (PedsQL4.0), and Pediatric Outcome Data Collection Instrument (PODCI). RESULTS: The median current age [14 (10-18) vs. 15 (10-18) years, p=0.847] and frequency of female sex (62% vs. 58%, p=0.571) were similar in adolescents with chronic conditions compared with healthy adolescents. The frequency of poor sleep quality was similar in both groups (38% vs. 48%, p=0.118). Logistic regression analysis, including both healthy adolescents and adolescents with chronic conditions (n=387), demonstrated that self-reported increase in screen time (odds ratio [OR] 3.0; 95% confidence interval [CI] 1.3-6.8; p=0.008) and intrafamilial violence report (OR 2.1; 95% CI 1.2-3.5; p=0.008) were independently associated with poor sleep quality in these adolescents. However, the PODCI global function score was associated with a lower OR for poor sleep quality (OR 0.97; 95% CI 0.94-0.99; p=0.001). Further logistic regression, including only adolescents with chronic conditions (n=305), demonstrated that self-reported increase in screen time (OR 3.1; 95% CI 1.4-6.8; p=0.006) and intrafamilial violence report (OR 2.0; 95% CI 1.2-3.4; p=0.011) remained independently associated with poor quality of sleep, whereas a lower PODCI global function score was associated with a lower OR for sleep quality (OR 0.96; 95% CI 0.94-0.98; p<0.001). CONCLUSION: Self-reported increases in screen time and intrafamilial violence report impacted sleep quality in both healthy adolescents and those with chronic conditions. Decreased health-related quality of life was observed in adolescents with poor sleep quality.

https://doi.org/10.6061/clinics/2021/e3501

Double Patch Antenna Array for Communication and Out-of-band RF Energy Harvesting
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Silva, Vinícius S.

; Paz, Humberto P.

; Cambero, Eduardo V. V.

; Pereira, Emerson T.

; Casella, Ivan R. S.

; Capovilla, Carlos E.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

Journal Metrics
- Sobre o periódico
- SciELO Analytics

sep 2020, Volume 19 N. 3 Pages 356 - 365

Abstract: En | Text: En | PDF: En

Abstract This paper presents a patch antenna array topology for Simultaneous Wireless Information and Power Transfer (SWIPT) applications. The resulting Double Patch Antenna Array (DPA) is composed of two patch antennas operating at different frequencies and fabricated on a unique substrate. One of the patches operates at the 1.8 GHz mobile communication band and is used for wireless communication, while the other one operates at the 2.4 GHz Industrial, Scientific, and Medical (ISM) band, and is used for Radio Frequency Energy Harvesting (RFEH). The analyzes and measurements carried out have shown that the adopted topology has satisfactory performance for communication, with a gain of 1.5 dBi, and for out-of-band energy harvesting, with a Vout of 160 mV at 2.45 GHz. These results indicate this approach as a promising strategy for low-power wireless applications.

https://doi.org/10.1590/2179-10742020v19i3788 525 downloads

I Diretriz sobre o consumo de gorduras e saúde cardiovascular
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics

Santos, R.D.

; Gagliardi, A.C.M.

; Xavier, H.T.

; Magnoni, C.D.

; Cassani, R .

; Lottenberg, A.M.P.

; Casella Filho, A.

; Araújo, D.B.

; Cesena, F.Y.

; Alves, R.J.

; Fenelon, G.

; Nishioka, S.A.D.

; Faludi, A.A.

; Geloneze, B.

; Scherr, C.

; Kovacs, C.

; Tomazzela, C.

; Carla, C.

; Barrera-Arellano, D.

; Cintra, D.

; Quintão, E.

; Nakandakare, E.R.

; Fonseca, F.A.H.

; Pimentel, I.

; Santos, J.E.

; Bertolami, M.C.

; Rogero, M.

; Izar, M.C.

; Nakasato, M.

; Damasceno, N.R.T.

; Maranhão, R.

; Cassani, R.S.L.

; Perim, R.

; Ramos, S.

Arquivos Brasileiros de Cardiologia

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jan 2013, Volume 100 N. 1 Pages 1 - 40

Abstract: Pt | Text: Pt | PDF: Pt

290296 downloads

Wireless coding deadbeat power control for doubly-fed induction aerogenerators in smart grid applications
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics

Sguarezi Filho, A. J.

; Casella, Ivan R. S.

; Capovilla, C. E.

; Ruppert, E.

Sba: Controle & Automação Sociedade Brasileira de Automatica

Journal Metrics
- Sobre o periódico
- SciELO Analytics

oct 2012, Volume 23 N. 5 Pages 541 - 552

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

As redes inteligentes utilizam uma avançada infraestrutura de telecomunicações para promover o gerenciamento de toda a geração, transmissão e armazenagem de energia sobre uma região de maneira muito mais eficiente do que é feito hoje em dia. Entretanto, nas redes inteligentes, a utilização de tecnologias de comunicação sem fio para a transmissão de sinais de monitoramento e controle requerem uma eficiente proteção contra erros na transmissão dos dados, evitando assim sérios problemas à planta energética. Com esse foco, o trabalho trata do projeto de um sistema de controle deadbeat codificado sem fio de potências para um gerador de indução duplamente alimentado voltado à geração eólica para aplicações em redes inteligentes.

Smart grids comprise advanced communication infrastructure to provide balance supply, demand, and storage of energy over a region in a much more efficient manner than it is done today. However, in a smart grid, the utilization of wireless technologies for transmitting control information requires a powerful error protection to avoid any serious problems to the energétic plant. With this focus, the work is concerned with a wireless coding deadbeat power control system for a variable speed wind doubly-fed induction generator for smart grid applications.

3428 downloads

Attitude Control of a Satellite by Using Digital Signal Processing
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Santana, Adrielle C.

; Martins-Filho, Luiz S.

; Duarte, Ricardo O.

; Arantes Jr., Gilberto

; Casella, Ivan S.

Journal of Aerospace Technology and Management

Journal Metrics
- Sobre o periódico
- SciELO Analytics

mar 2012, Volume 4 N. 1 Pages 15 - 24

Abstract: En | Text: En | PDF: En

Abstract: This article has discussed the development of a three-axis attitude digital controller for an artificial satellite using a digital signal processor. The main motivation of this study is the attitude control system of the satellite Multi-Mission Platform, developed by the Brazilian National Institute for Space Research for application in different sort of missions. The controller design was based on the theory of the Linear Quadratic Gaussian Regulator, synthesized from the linearized model of the motion of the satellite, i.e., the kinematics and dynamics of attitude. The attitude actuators considered in this study are pairs of cold gas jets powered by a pulse width/pulse frequency modulator. In the first stage of the project development, a system controller for continuous time was studied with the aim of testing the adequacy of the adopted control. The next steps had included an analysis of discretization techniques, the setting time of sampling rate, and the testing of the digital version of the Linear Quadratic Gaussian Regulator controller in the MATLAB/SIMULINK. To fulfill the study, the controller was implemented in a digital signal processor, specifically the Blackfin BF537 from Analog Devices, along with the pulse width/pulse frequency modulator. The validation tests used a scheme of co-simulation, where the model of the satellite was simulated in MATLAB/SIMULINK, while the controller and modulator were processed in the digital signal processor with a tool called Processor-In-the-Loop, which acted as a data communication link between both environments.function and required time to achieve a given mission accuracy are determined, and results are provided as illustration.

https://doi.org/10.5028/jatm.2012.04014611 1426 downloads

Monitoring of physiological and blood parameters during perinatal and neonatal period in calves
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics

Piccione, G.

; Casella, S.

; Pennisi, P.

; Giannetto, C.

; Costa, A.

; Caola, G.

Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Journal Metrics
- Sobre o periódico
- SciELO Analytics

feb 2010, Volume 62 N. 1 Pages 1 - 12

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Realizou-se o monitoramento da temperatura retal das frequências cardíaca e respiratória e de alguns parâmetros sanguíneos em oito bezerros da raça Limousine, durante o período perinatal e neonatal. Paralelamente às mensurações da temperatura retal e das frequências cardíaca e respiratória (9h), foram pesquisados, por meio de espectrofotômetro de UV, proteína total, colesterol total, triglicérides, glicose, ácidos graxos não esterificados (NEFA), ureia, creatinina, colinesterose, lactato desidrogenase (LDH), hidroxibutirato, glutamato piruvato transaminases (GOT), direta e total bilirrubina, magnésio, fósforo, cloretos e sódio. Os resultados mostraram efeito significativo dos dias de vida (P<0,05) somente sobre o colesterol total, creatinina e GOT, durante a primeira semana e um significante efeito de dias de vida sobre a temperatura retal, as frequências cardíaca e respiratória, colesterol total, NEFA, creatina e GOT durante o primeiro mês de vida. Observou-se correlação entre os valores individuais para dias de vida e frequência cardíaca durante o primeiro mês de vida. Conclui-se que as modificações desses parâmetros podem ser atribuídas ao desenvolvimento dos bezerros no período neonatal, contribuindo para o conhecimento do processo de adaptação, em bezerros, durante a primeira semana e o primeiro mês de vida.

Rectal temperature, heart and respiratory rates, and the course of some blood parameters were monitored in calves during perinatal and neonatal periods. The study was carried out on eight Limousine calves. From all subjects, rectal temperature, heart rate, and respiratory rate were measured. Blood samples were taken at the same hour (9am) from the external jugular vein, and then centrifuged and stored until analyses. By means of an UV spectrophotometer, the following blood parameters were assessed for each subject: total protein, total cholesterol, triglycerides, glucose, non-esterified fatty acids (NEFA), urea, creatinine, cholinesterase, lactate dehydrogenase (LDH), hydroxybutirate, glutamate pyruvate transaminases (GPT), glutamate oxalacetate transaminases (GOT), direct and total bilirubin, magnesium, iron, potassium, phosphorus, chloride and sodium. The results showed a significant effect of days of life (P<0.05) only on total cholesterol, creatinine and GOT during the first week of life and a significant effect of days of life on rectal temperature, heart rate, respiratory rate, total cholesterol, NEFA, creatinina, and GOT during the first month of life. A correlation among individual values for postnatal age (days of life) and heart rate in calves during the first month of life was observed. In conclusion, modifications of studied parameters could be attributed to functional development of calves in neonatal period and contribute to the knowledge of adaptation processes in calf during the first week and the first month of life resulting useful for the diagnosis and treatment of any neonatal diseases.

38620 downloads Cited 3 times in SciELO

Distribuição geográfica de pequenos mamíferos não voadores nas bacias dos rios Araguaia e Paraná, região centro-sul do Brasil
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics

Cáceres, Nilton C.

; Casella, Janaína

; Vargas, Claudeir F.

; Prates, Lucineia Z.

; Tombini, Alam A. M.

; Goulart, Charla S.

; Lopes, Wellington H.

Iheringia. Série Zoologia

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jun 2008, Volume 98 N. 2 Pages 173 - 180

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Realizaram-se amostragens de pequenos mamíferos em duas bacias hidrográficas do Brasil central pertencentes aos rios Araguaia e Paraná com intuito de descrever a composição de espécies de pequenos mamíferos de hábito florestal e comparar suas distribuições geográficas. Quatorze pontos de coleta foram amostrados, subdivididos em oito na bacia do Rio Paraná e seis na bacia do Rio Araguaia. Foram registradas 20 espécies de pequenos mamíferos na região (oito de marsupiais e 12 de roedores), sendo 16 delas por meio de armadilhas metálicas (5.253 armadilhas-noite) e oito delas por meio de armadilhas de queda (224 baldes-noite), totalizando 161 capturas de 139 indivíduos. A bacia do Rio Paraná apresentou 16 espécies (armadilhas-noite: 3.115; baldes-noite: 104) e a bacia do Araguaia apresentou 11 espécies (armadilhas-noite: 2.138; baldes-noite: 120), sendo que as riquezas foram similares quando aplicado o método da rarefação. Das 20 espécies registradas, sete (35%) ocorreram em ambas as bacias. Apesar da elevada riqueza de espécies amostrada, destacou-se a elevada abundância do marsupial Didelphis albiventris Lund, 1840. As espécies de marsupiais amostradas foram D. albiventris, Caluromys philander (Linnaeus, 1758), Cryptonanus cf. agricolai Voss, Lunde & Jansa, 2005, Gracilinanus agilis (Burmeister, 1854), G. microtarsus (Wagner, 1842), Lutreolina crassicaudata (Desmarest, 1804), Marmosa murina (Linnaeus, 1758), e Philander opossum (Linnaeus, 1758). As espécies de roedores amostradas foram Akodon gr. cursor, Calomys tener (Winge, 1887), Nectomys rattus (Pelzen, 1883), N. squamipes (Brants, 1827), Oecomys bicolor (Tomes, 1860), Oryzomys maracajuensis Langguth & Bonvicino, 2002, Oryzomys cf. marinhus, O. megacephalus (Fischer, 1814), Oligoryzomys fornesi (Massoia, 1973), Oligoryzomys sp., Proechimys longicaudatus (Rengger, 1830) e P. roberti (Thomas, 1901). A ampliação da distribuição de algumas espécies é discutida, assim como aspectos biogeográficos. A Serra dos Caiapós pode ter sido uma barreira geográfica para algumas espécies de pequenos mamíferos em face da retração e expansão das florestas ocorridas no passado.

We collected small mammals in two hydrographic basins in central Brazil, namely the Paraná and Araguaia basins, with the aim of examining the composition of forest dwelling small mammal species and to compare their geographic distributions. Fourteen sites were sampled, eight in the Paraná basin and six in the Araguaia basin. A total of 20 species of small mammals was registered (8 marsupials and 12 rodents), 16 of them in live traps (5,253 trap-nights) and eight in pitfalls (224 trap-nights), adding to a total of 161 captures of 139 individuals. The Paraná basin showed 16 species (trap-nights: 3,115 and 104 respectively) and the Araguaia basin 11 species (trap-nights: 2,138 and 120 respectively), being both richness similar when the rarefaction method was applied. Seven (35%) out of the 20 species recorded occurred in both basins. The marsupial Didelphis albiventris Lund, 1840 was the most abundant species. The marsupials species recorded were D. albiventris, Caluromys philander (Linnaeus, 1758), Cryptonanus cf. agricolai Voss, Lunde & Jansa, 2005, Gracilinanus agilis (Burmeister, 1854), G. microtarsus (Wagner, 1842), Lutreolina crassicaudata (Desmarest, 1804), Marmosa murina (Linnaeus, 1758), and Philander opossum (Linnaeus, 1758). The rodent species recorded were Akodon gr. cursor, Calomys tener (Winge, 1887), Nectomys rattus (Pelzen, 1883), N. squamipes (Brants, 1827), Oecomys bicolor (Tomes, 1860), Oryzomys maracajuensis Langguth & Bonvicino, 2002, Oryzomys cf. marinhus, O. megacephalus (Fischer, 1814), Oligoryzomys fornesi (Massoia, 1973), Oligoryzomys sp., Proechimys longicaudatus (Rengger, 1830) and P. roberti (Thomas, 1901). The range extension of some species is discussed, in addition to biogeographic considerations. The Caiapós Mountains may have been a geographic barrier for some small mammal species in the face of the retraction and expansion of forests in the past.

8339 downloads

10.

Polarized light microscopy of hair shafts aids in the differential diagnosis of Chédiak-Higashi and Griscelli-Prunieras syndromes
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics

Valente, Neusa Y.S.

; Machado, Maria Cecilia M.R.

; Boggio, Paula

; Alves, Ana Cristina F.

; Bergonse, Fabiane N.

; Casella, Erasmo

; Vasconcelos, Dewton Moraes

; Grumach, Anete S.

; Oliveira, Zilda N.P. de

Clinics

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 2006, Volume 61 N. 4 Pages 327 - 332

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

OBJETIVO: Estudar e comparar o aspecto dos cabelos de portadores das síndromes de Chédiak-Higashi e Griscelli-Prunieras, tanto na microscopia óptica convencional quanto com luz polarizada. MÉTODO: Cabelos de dois doentes portadores da síndrome de Chédiak-Higashi e de dois portadores da síndrome de Griscelli-Prunieras foram obtidos e estudados tanto à microscopia convencional quanto com luz polarizada. RESULTADOS: Na microscopia óptica convencional, os cabelos dos doentes portadores da síndrome de Chédiak-Higashi mostraram grânulos de melanina regulares, com distribuição homogênea e de maior tamanho em comparação aos presentes no cabelo normal. À microscopia de luz polarizada notou-se aspecto brilhante e refringência policromática. Diferentemente, os cabelos dos doentes portadores da síndrome de Griscelli-Prunieras apresentaram à microscopia convencional, grânulos de melanina irregulares e maiores do que os presentes no cabelo normal e os presentes nos cabelos dos doentes portadores da síndrome de Chédiak-Higashi, preferencialmente próximos à medula das hastes pilosas. À microscopia de luz polarizada apresentaram aspecto monotonamente esbranquiçado. CONCLUSÃO: O exame dos cabelos pela microscopia convencional nas síndromes de Chédiak-Higashi e Griscelli-Prunieras revela diferenças sutis no reconhecimento dessas doenças. No presente trabalho apresentamos evidência de que o exame das hastes pilosas com microscopia de luz polarizada - não descrito previamente - contribui na diferenciação de ambas doenças sugerindo que esse seja um método diagnóstico útil na distinção entre as síndromes de Chédiak-Higashi e Griscelli Prunieras, especialmente nos casos em que estudos moleculares mais sofisticados não estejam disponíveis.

PURPOSE: To study and compare the appearance of hairs from patients with Chédiak-Higashi and Griscelli-Prunieras syndromes under light and polarized light microscopy. METHOD: Hairs from 2 Chédiak-Higashi and 2 Griscelli-Prunieras patients were obtained and examined under normal and polarized light microscopy. RESULTS: Under light microscopy, hairs from Chédiak-Higashi patients presented evenly distributed, regular melanin granules, larger than those seen in normal hairs. Under polarized light microscopy, shafts exhibited a bright and polychromatic refringence appearance. In contrast, hair from Griscelli-Prunieras patients, under light microscopy, exhibited bigger and irregular melanin granules, distributed mainly near the medulla. Under polarized light microscopy, shafts appeared monotonously white. CONCLUSION: Light microscopic examination of hair shafts of patients with Chédiak-Higashi or Griscelli-Prunieras syndrome reveals subtle differences that are useful in identifying both disorders, but not in distinguishing between them. We provide evidence that polarized light microscopy of hair shafts, an approach that has not been previously described, aids in differentiating between these syndromes. We propose hair study by polarized light microscopy as a helpful complementary diagnostic method for differential diagnosis between CHS and GPS, especially when the more sophisticated molecular studies are not available.

7300 downloads

11.

Spinal cord schistosomiasis in children: analysis of seven cases
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics

Paz, José Albino da

; Valente, Marcelo

; Casella, Erasmo Barbante

; Marques-Dias, Maria Joaquina

Arquivos de Neuro-Psiquiatria

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jun 2002, Volume 60 N. 2A Pages 224 - 230

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Relatamos sete crianças com mielorradiculopatia devida a infecção pelo S. mansoni, com idade entre 2 e 14 anos. Nenhuma apresentou acometimento hepatoesplênico e uma apresentou quadro intestinal. A forma mielorradicular foi observada em quatro pacientes e a pseudotumoral em três. Revendo os achados da literatura, encontramos que a forma pseudotumoral é mais frequente nas crianças que nos adultos, apesar das formas mielíticas e mielorradiculares serem ainda as mais frequentes em todas as idades. O diagnóstico baseou-se nos achados clínicos e epidemiológicos, associados aos laboratoriais. A presença de ovos de S. mansoni nas fezes (5 casos) e/ou a positividade de testes imunológicos específicos no liquido cefalorraquidiano (5 casos), com padrão inflamatório e eosinofilorraquia (entre 1 e 24%) confirmou o diagnóstico. O estudo da imagem de ressonância magnética, apesar de não permitir o diagnóstico etiológico, ajudou a confirmar a forma e o nível medular da lesão.

We describe seven cases of children (ages 2 to 14 years) with myeloradiculopathy caused by infection with S. mansoni. None of them presented hepatosplenic involvement and one presented an intestinal picture. The myeloradicular and pseudotumoral forms were observed in four and three patients, respectively. Comparing the reports in the literature, we found that the pseudotumoral form is more similary frequent among children than in adults, while the myelitic and myeloradicular forms are the most frequent and distributed across all age groups. Diagnosis is based on clinical and epidemiological findings in association with laboratory tests. The diagnosis was confirmed by the presence of S. mansoni eggs in feces (5 cases) and / or the positivity in specific immunological tests (5 cases) associated with a cerebrospinal fluid inflammatory pattern with presence of eosinophils (between 1 and 24%). Magnetic resonance image, although it does not enable an etiological diagnosis, helped to confirm the form and spinal cord level of the lesion.

3013 downloads Cited 2 times in SciELO

12.

Vaccine-associated paralytic Poliomyelitis: a case report of domiciliary transmission
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics

Paz, José A.

; Vallada, Marcelo G.

; Marques, Silvia N. C. H.

; Casella, Erasmo B.

; Marques, Heloisa H. S.

; Marques-Dias, Maria J.

Revista do Hospital das Clínicas

Journal Metrics
- Sobre o periódico
- SciELO Analytics

jun 2000, Volume 55 N. 3 Pages 101 - 104

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A poliomielite associada à vacina oral é definida como a forma paralítica da poliomielite anterior aguda decorrente da cepa vacinal. Uma vez que o comportamento da cepa vacinal é semelhante ao do vírus selvagem, epidemiologicamente podemos distinguir dois tipos de poliomielite associada à vacina, os casos em que o paciente foi vacinado e os casos em que o paciente teve contato com pessoas que receberam a vacina. Apresentamos o caso de um lactente não vacinado, que apresentou quadro de poliomielite anterior aguda associada à vacina oral, cujo irmão havia recebido a vacina Sabin 20 dias antes do início do quadro clínico. Na cultura de fezes do paciente foi isolado o poliovírus tipo 3, cepa vacinal, que apresentava mutação do nucleotídeo 472 (C<FONT FACE="Symbol">®</font>U) na região 5' não codificadora, a qual está significativamente relacionada com a maior virulência da cepa.

Poliomyelitis associated with live strain vaccine is defined as the paralytic form of the acute anterior poliomyelitis related to the vaccine strain. Since these strains behave similarly to the wild-type virus, we can differentiate, epidemiologically, two types of vaccine-associated poliomyelitis: cases in which the patient was vaccinated and cases in which the patient had had contact with vaccinated individuals. We herein present the case of an unvaccinated child, with a clinical picture of an acute anterior poliomyelitis associated with the live strain vaccine, whose brother received the Sabin vaccine 20 days before the onset of the symptoms. Vaccine strain of the type 3 poliovirus was isolated in fecal culture and a presented mutation in nucleotide 472 (C<FONT FACE="Symbol">®</font>U) in the 5' non-coding region, which is strongly related to the higher strain virulence.

4171 downloads

13.

DIÓXIDO DE CARBONO ASSOCIADO À FOSFINA NO CONTROLE DO GORGULHO-DO-MILHO (Sitophilus zeamais)
Facebook Twitter

Other social networks
Google+
LinkedIn
Reddit
StambleUpon
CiteULike
Mendeley
Other networks

Metrics
- SciELO Analytics
- Dimensions
- PlumX
- Altmetric

Casella, Talita Lacaze de Camargo

; Faroni, Lêda Rita D'Antonino

; Berbert, Pedro Amorim

; Cecon, Paulo Roberto

Revista Brasileira de Engenharia Agrícola e Ambiental

Journal Metrics
- Sobre o periódico
- SciELO Analytics

aug 1998, Volume 2 N. 2 Pages 179 - 185

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

RESUMO O objetivo deste trabalho foi avaliar o efeito da utilização de fosfina, associada a atmosferas ricas em dióxido de carbono, no controle efetivo de Sitophilus zeamais, em todas as suas fases de desenvolvimento, em grãos de milho, a temperatura de 29°C e 65% de umidade relativa. Os tratamentos compreenderam a combinação de atmosfera controlada (21% de CO2 e 79% de N2) e três doses de fosfina (0,25, 0,50 e 0,75g.m-3) e atmosfera ambiente e duas doses de fosfina (0,0 e 1,0g.m-3) em três períodos de exposição (24, 72 e 120h) totalizando 15 tratamentos. Para o trabalho, construiu-se uma câmara hermética, à qual foram acoplados um sistema para injeção e exaustão do gás e um dispositivo para umidificação do gás in loco e para controle da temperatura. Para se avaliar a eficácia dos gases em todas as fases de desenvolvimento do S. zeamais, fez-se a contagem do número de insetos adultos sobreviventes e como conclusão, verificou-se que, em se aumentando o período de exposição aumenta-se, também, a eficácia de controle, exceto para larvas de 2o ínstar. O controle efetivo (100%) das fases de desenvolvimento do Sitophilus foi obtido com os tratamentos de atmosfera sintética e 0,50 e 0,75g.m-3, no período de exposição de 120h.

ABSTRACT The object of this study was to evaluate the effect of the use of phosphine, associated with atmospheres rich in carbon dioxide, on the effective control of Sitophilus zeamais, in all developmental phases, in corn stored at 29°C and 65% relative humidity. Treatments consisted of a combination of controlled atmosphere (21% CO2 and 79% N2) with three phosphine doses (0.25, 0.50 and 0.75g.m-3) and ambient atmosphere with two phosphine doses (0.0 and 1.0 g.m-3), plus three exposure periods (24, 72 and 120h), resulting in 15 treatments. To achieve this a hermetic chamber was built, consisting of a system for the gas injection and exhaustion, a device for gas humidification and another for temperature control. To evaluate the efficiency of the modified atmosphere in all developmental phases of S. zeamais, the number of surviving adult insects was counted. It is concluded that by increasing the exposure period, the efficiency of control is increased, except for the second instar larvae. The effective control (100%) of all developing stages of Sitophilus was achieved with the synthetic atmosphere and 0.50 and 0.75 g.m-3 of phosphine, for an exposition period of 120h.

https://doi.org/10.1590/1807-1929/agriambi.v02n02p179-185 841 downloads

Showing

itens per page

Page of 1 Next

Select one or more results

All Alphabetic

Results

Comparative chart Download CSV

Statistics of

Send result

To*

Use ; (semicolon) to insert more emails.

Send to email

This page

Selected records

All references (max. 300)

Your email

Subject

Comments

Export format:

RIS (for EndNote, ProCite, Reference Manager, RefWorks, Citavi, etc.)

BibTeX

Citation

CSV (for Excel, etc)

Export:

This page

Selected itens

All references (max. 2000)

Sem resultados

No documents were found for your search

Glossary and search help

You can enrich your search in a very simple way. Use the search indexes combined with the connectors (AND or OR) and specify more your search.

For example, if you want to search for articles about
cases of dengue in Brasil in 2015, use:
ti:dengue and publication_year:2015 and aff_country:Brasil

See below the complete list of search indexes that can be used:

Index code	Element
ti	article title
au	author
kw	article keywords
subject	subject (title words, abstract and keywords)
ab	abstract
ta	journal short title (e.g. Cad. Saúde Pública)
journal_title	journal full title (e.g. Cadernos de Saúde Pública)
la	publication language code (e.g. pt - Portuguese, es - Spanish)
type	document type
pid	publication identifier
publication_year	publication year of publication
sponsor	sponsor
aff_country	country code of the author's affiliation
aff_institution	author affiliation institution
volume	article volume
issue	article issue
elocation	elocation
doi	DOI number
issn	journal ISSN
in	SciELO colection code (e.g. scl - Brasil, col - Colômbia)
use_license	article usage license code

SciELO - Scientific Electronic Library Online
Rua Dr. Diogo de Faria, 1087 – 9º andar – Vila Clementino 04037-003 São Paulo/SP - Brasil
Email: scielo@scielo.org

All the contents of this site www.scielo.br, except where otherwise noted, is licensed under a Creative Commons Attribution License.
more »