Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 25
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
Breathing pattern and thoracoabdominal motion during exercise in chronic obstructive pulmonary disease BJMBR
Alves,G.S.; Britto,R.R.; Campos,F.C.; Vilaça,A.B.O.; Moraes,K.S.; Parreira,V.F..
Subjects with chronic obstructive pulmonary disease (COPD) present breathing pattern and thoracoabdominal motion abnormalities that may contribute to exercise limitation. Twenty-two men with stable COPD (FEV1 = 42.6 ± 13.5% predicted; age 68 ± 8 years; mean ± SD) on usual medication and with at least 5 years of diagnosis were evaluated at rest and during an incremental cycle exercise test (10 watts/2 min). Changes in respiratory frequency, tidal volume, rib cage and abdominal motion contribution to tidal volume and the phase angle that measures the asynchrony were analyzed by inductive respiratory plethysmography at rest and during three levels of exercise (30-50, 70-80, and 100% maximal work load). Repeated measures ANOVA followed by pre-planned contrasts...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breathing pattern; Chronic obstructive pulmonary disease; Exercise; Plethysmography; Ventilation.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001100001
Imagem não selecionada

Imprime registro no formato completo
Caracteristicas de sementes de gramineas nativas do cerrado. Repositório Alice
CARMONA, R.; MARTINS, C. R.; FAVERO, A. P..
Avaliaram-se caracteristicas de sementes de 22 especies de gramineas nativas do cerrado, como: ocorrencia de esterilidade, massa de sementes cheias e vazias, possibilidade de ventilacao e quantidade de sementes por peso. As especies dos generos Aristida, Ctenium, Diectiomis e Schizachyrium apresentaram os maiores indices de espiguetas ferteis (superior a 50%), enquanto as dos generos Andropogon e Hypogynium apresentaram valores intermediarios (25-49%); em Paspalum, Setaria e Thrazya, a ocorrencia de espiguetas ferteis foi baixa (5-24%), e em Axonopus, muito baixa (inferior a 5%). O numero medio de sementes cheias por grama variou de 20 em Paspalum reduncum a quase 3.000 em Aristida gibbosa; esta informacao e importante na determinacao da taxa de semeadura....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Desaristamento; Espiguetas; Esterelidade de sementes; Massa; Taxa de semeadura; Ventilacao; De-awn; Spikelets; Sterility fo seeds; Weight; Rate of sowing; Ventilation.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/87081
Imagem não selecionada

Imprime registro no formato completo
Cardiovascular and respiratory changes during slow-wave sleep in rats are associated with electrocorticogram desynchronization BJMBR
Dias-dos-Santos,J.R.; Machado,B.H..
In awake rats a single recurrent larger tidal volume (deep breaths) occurs at regular intervals, followed by oscillations in arterial pressure and heart rate. In the present study we recorded the changes in blood pressure, heart rate and ventilation during the wakefulness-sleep cycle identified by electrocorticographic records in order to determine whether the deep breaths and cardiovascular oscillations were associated with changes in the electrocorticogram. During several episodes of slow-wave sleep (SWS) in 7 rats the deep breaths and oscillations in arterial pressure and heart rate were preceded by SWS desynchronization. The interval between deep breaths during SWS was 71 ± 4 s, the period between initial desynchronization and the generation of deep...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Wakefulness-sleep cycle; Ventilation; Cardiovascular regulation; Deep breaths; Ventilatory patterns; Arterial pressure oscillations; Whole body plethysmography.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001100018
Imagem não selecionada

Imprime registro no formato completo
CFD Model of Regenerative Heat Exchanger CIGR Journal
Pavel Kic.
This paper is focused on the Computational fluid dynamics (CFD) modeling of regenerative heat exchanger suitable for animal houses. Buildings used for housing of animals in farms with intensive breeding, like poultry or pig houses, are characterized by high generation of heat inside, partly produced by animals, and in the case of small young animals, supplemented also by heating. On the other side these buildings need intensive ventilation which causes big losses of energy by exhausted air. A good way how to reduce heat losses can be the use of technical systems of heat recovery. There are two principal constructions of heat exchangers for heat recovery. There are either recuperative or regenerative heat exchangers. Industrially produced heat exchangers,...
Palavras-chave: Animal houses; Ventilation; Energy; Parameters; Czech Republic.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3137
Imagem não selecionada

Imprime registro no formato completo
CFD Model of Regenerative Heat Exchanger CIGR Journal
Kic, Pavel.
This paper is focused on the Computational fluid dynamics (CFD) modeling of regenerative heat exchanger suitable for animal houses. Buildings used for housing of animals in farms with intensive breeding, like poultry or pig houses, are characterized by high generation of heat inside, partly produced by animals, and in the case of small young animals, supplemented also by heating. On the other side these buildings need intensive ventilation which causes big losses of energy by exhausted air. A good way how to reduce heat losses can be the use of technical systems of heat recovery. There are two principal constructions of heat exchangers for heat recovery. There are either recuperative or regenerative heat exchangers. Industrially produced heat exchangers,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal houses; Ventilation; Energy; Parameters; Czech Republic.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3137
Imagem não selecionada

Imprime registro no formato completo
Characterizing the chaotic nature of ocean ventilation ArchiMer
Macgilchrist, Graeme A.; Marshall, David P.; Johnson, Helen L.; Lique, Camille; Thomas, Matthew.
Ventilation of the upper ocean plays an important role in climate variability on interannual to decadal timescales by influencing the exchange of heat and carbon dioxide between the atmosphere and ocean. The turbulent nature of ocean circulation, manifest in a vigorous mesoscale eddy field, means that pathways of ventilation, once thought to be quasi-laminar, are in fact highly chaotic. We characterize the chaotic nature of ventilation pathways according to a nondimensional filamentation number, which estimates the reduction in filament width of a ventilated fluid parcel due to mesoscale strain. In the subtropical North Atlantic of an eddy-permitting ocean model, the filamentation number is large everywhere across three upper ocean density...
Tipo: Text Palavras-chave: Ventilation; North Atlantic; Thermocline; Chaos; Mesoscale eddies; Lagrangian trajectories.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00410/52104/52807.pdf
Imagem não selecionada

Imprime registro no formato completo
Design and validation of a mobile air filter testing laboratory for animal agricultural applications CIGR Journal
Smith, Benjamin; Ramirez, Brett; Hoff, Steven; Harmon, Jay; Stinn, John.
The US swine industry is shifting towards filtered fresh-air ventilation systems that use pleated filters to improve breeding herd health and reduce airborne disease outbreak frequency. Loaded filters reduce airflow causing a poor environment and elevated energy use. Typical axial fans cannot efficiently maintain the rated differential pressure (DP; 100 Pa) for pleated filters; hence, a lower design filter DP (37 Pa) is used and consequently, more filters are required to achieve design maximum ventilation. Large, common filter banks for multiple staged fans presents significant challenges in using continuous DP measurement to assess filter life, making it impossible to separate filter loading DP from overall airflow DP. A mobile air filter testing (MAFT)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biosecurity; Disease transmission; PRRS virus; Swine; Ventilation.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5458
Imagem não selecionada

Imprime registro no formato completo
Effects of different levels of positive airway pressure on breathing pattern and heart rate variability after coronary artery bypass grafting surgery BJMBR
Pantoni,C.B.F.; Di Thommazo,L.; Mendes,R.G.; Catai,A.M.; Luzzi,S.; Amaral Neto,O.; Borghi-Silva,A..
The application of continuous positive airway pressure (CPAP) produces important hemodynamic alterations, which can influence breathing pattern (BP) and heart rate variability (HRV). The aim of this study was to evaluate the effects of different levels of CPAP on postoperative BP and HRV after coronary artery bypass grafting (CABG) surgery and the impact of CABG surgery on these variables. Eighteen patients undergoing CABG were evaluated postoperatively during spontaneous breathing (SB) and application of four levels of CPAP applied in random order: sham (3 cmH2O), 5 cmH2O, 8 cmH2O, and 12 cmH2O. HRV was analyzed in time and frequency domains and by nonlinear methods and BP was analyzed in different variables (breathing frequency, inspiratory tidal volume,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Continuous positive airway pressure; Cardiovascular system; Autonomic nervous system; Ventilation; Coronary artery bypass.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000100006
Imagem não selecionada

Imprime registro no formato completo
Effects of inspired oxygen fractions in rabbits anesthetized with isoflurane or sevoflurane, maintained on spontaneous ventilation Arq. Bras. Med. Vet. Zootec.
Horr,M.; Nunes,N.; Biteli,E.G.F.; Lopes,P.C.F.; Gering,A.P.; Moro,J.V.; Rocha,F.D.L..
ABSTRACT It is important to identify the best inspired fraction of oxygen in a variety of situations, including sevoflurane or isoflurane anesthesia, in spontaneously breathing rabbits. For this, 64 rabbits were assigned to eight groups: GI100 (FiO2= 1,0 + isoflurane), GS100 (FiO2= 1,0 + sevoflurane), GI80 (FiO2= 0,8 + isoflurane), GS80 (FiO2= 0,8 + sevoflurane), GI60 (FiO2= 0,6 + isoflurane), GS60 (FiO2= 0,6 + sevoflurane), GI21 (FiO2= 0,21 + isoflurane), GS21 (FiO2= 0,21 + sevoflurane). The induction was performed with (2.5MAC) of the anesthetic. The vaporizer was setted at 1.5 MAC and FiO2 as attributed for each group. After the induction, the concentration was changed to 1 MAC. Measurements of parameters were performed 30 minutes after induction (T0),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Rabbit; Inhalatory anesthesia; Ventilation.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000300944
Imagem não selecionada

Imprime registro no formato completo
Engineered solutions for animal heat stress abatement in livestock buildings. CIGR Journal
Arcidiacono, Claudia.
Heat stress in animal housing is one of the drivers affecting animal productivity and welfare in hot climates, and causing consequent reduced profits for the farmers. The main challenges that livestock breeding faces in hot climates regards how to foster, improve, and assess methods and strategies for animal heat stress abatement. Research studies in this field have generally proposed modifications in herd management and in feeding strategies, breed selection, and engineered solutions aimed at exploiting heat transmission phenomena. In this paper, the most recent engineered solutions for animal heat stress abatement in livestock buildings have been reviewed and described; they have involved new building and ventilation design and modelling, and improved...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Rural buildings livestock buildings; Design; Modelling; Ventilation; Hot climate.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4705
Imagem não selecionada

Imprime registro no formato completo
Glacial and Interglacial Changes in Southwest Pacific Water Mass Ventilation and Circulation ArchiMer
Ronge, Thomas Alexander.
Reconstructions on Antarctic ice cores revealed pronounced, millennial-scale variabilities in atmospheric CO2 over the past 800,000 years (e.g. Lüthi et al., 2008; Monnin et al., 2001; Petit et al., 1999; Raynaud et al., 2005; Siegenthaler et al., 2005). Despite these variabilities are known for several decades, the mechanisms, driving these patterns are still not fully resolved. As the ocean contains up to 60 times more carbon than the entire atmosphere, it is considered to be a major driver of the atmospheric CO2 levels (Broecker, 1982): Storing CO2 during glacials, releasing it during deglaciations. Because changes in the global thermohaline circulation are thought to operate on glacial/interglacial timescales, it has been suggested that during...
Tipo: Text Palavras-chave: 14C; Ventilation; Atmospheric CO2; AAIW; UCDW; LCDW; AABW.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00493/60453/63898.pdf
Imagem não selecionada

Imprime registro no formato completo
Hematological and biochemical profiles of rats (Rattus norvegicus) kept under microenvironmental ventilation system Braz. J. Vet. Res. Anim. Sci.
TEIXEIRA,Maria Araújo; CHAGURI,Luziane do Carmo Andrade Guinski; CARISSIMI,André Silva; SOUZA,Nívea Lopes de; MORI,Claudia Madalena Cabrera; GOMES,Valéria Maria Wanderley; POLI NETO,Adelino; NONOYAMA,Kimiyo; MERUSSE,José Luiz Bernardino.
Previous studies reported that rats (Rattus norvegicus) kept under microenvironmental ventilation systems (MEV) present better productive and health parameters when compared to animals kept under general diluting ventilation (GDV). The objective of the present research trial was to evaluate hematological and biochemical profiles of rats kept under MVS. In order to achieve this objective, two different trials were designed: Trail 1 (E1), in which it was evaluated the reproductive performance of males and females submitted to two different air speed limits - FV1, from 0.03 to 0.26 m / sec and FV2, from 0.27 to 0.80 m / sec. In Trial 2 (E2) it was evaluated different bed change intervals (3, 5, 7 and 9 days), for males kept under constant air speed (0.5 m /...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Laboratory animals; Rats; Hematology; Biochemistry; Ventilation.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962000000500001
Imagem não selecionada

Imprime registro no formato completo
Hyperventilation in panic disorder patients and healthy first-degree relatives BJMBR
Nardi,A.E.; Valença,A.M.; Nascimento,I.; Mezzasalma,M.A.; Lopes,F.L.; Zin,W.A..
Our aim was to observe the induction of panic attacks by a hyperventilation challenge test in panic disorder patients (DSM-IV) and their healthy first-degree relatives. We randomly selected 25 panic disorder patients, 31 healthy first-degree relatives of probands with panic disorder and 26 normal volunteers with no family history of panic disorder. All patients had no psychotropic drugs for at least one week. They were induced to hyperventilate (30 breaths/min) for 4 min and anxiety scales were applied before and after the test. A total of 44.0% (N = 11) panic disorder patients, 16.1% (N = 5) of first-degree relatives and 11.5% (N = 3) of control subjects had a panic attack after hyperventilating (chi² = 8.93, d.f. = 2, P = 0.011). In this challenge test...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Panic attacks; Respiration; Anxiety disorder; Ventilation.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000001100009
Imagem não selecionada

Imprime registro no formato completo
Mimicking Indoor Climate Dynamics and Ammonia Emissions in a Pig Housing Compartment Using Artificial Pigs and an Automatic Urea Spraying Installation CIGR Journal
Tabase, Raphael Kubeba.
The study aims to develop a test platform (TP) compartment that could mimic diurnal variations in indoor climate and NH3 emission in a real pig compartment and to compare diurnal indoor climate and NH3 production between two TP compartments and a real compartment. The objectives were achieved by using a real and TP compartment followed by an ad hoc test that used two TP compartments and another real compartment. The TP had two compartments equipped with mock-up pigs as heat source and automatic urea solution spraying installation to mimic pig urination at the pen floor. The study evaluated indoor climate and NH3 production in a 4-day comparative test between a TP and a real compartment followed by a 3-day comparative test between two TP compartments and a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ammonia; Emission; Modeling; Pig housing; Test platform; Ventilation; Belgium.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5216
Imagem não selecionada

Imprime registro no formato completo
Participation of nitric oxide in the nucleus isthmi in CO2-drive to breathing in toads BJMBR
Gargaglioni,L.H.; Branco,L.G.S..
The nucleus isthmi (NI) is a mesencephalic structure of the amphibian brain. It has been reported that NI plays an important role in integration of CO2 chemoreceptor information and glutamate is probably involved in this function. However, very little is known about the mechanisms involved. Recently, it has been shown that nitric oxide synthase (NOS) is expressed in the brain of the frog. Thus the gas nitric oxide (NO) may be involved in different functions in the brain of amphibians and may act as a neurotransmitter or neuromodulator. We tested the hypothesis that NO plays a role in CO2-drive to breathing, specifically in the NI comparing pulmonary ventilation, breathing frequency and tidal volume, after microinjecting 100 nmol/0.5 µl of L-NAME (a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitric oxide; Amphibian; Hypercapnia; Ventilation; Nucleus isthmi; Toad; CO2; L-NAME.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001100010
Imagem não selecionada

Imprime registro no formato completo
Perfomance of an evaporative cooling system of a finishing phase swine barn Scientia Agricola
Sartor,Valmir; Baêta,Fernando da Costa; Tinôco,Ilda de Fátima Ferreira; Luz,Maira Luciana.
The thermal environment inside of a finishing phase swine barn has great influence on the success of swine production. This environment can be characterized by the black globe temperature and humidity index (BGHI), that represents the air temperature, humidity, wind speed and radiation. Due to the small number of Brazilian reports on this specific subject, this experiment was performed to verify the effect of one kind of evaporative cooling system on the thermal comfort of the animal in a swine barn, during the 98/99 summer at Patos de Minas, MG, Brazil. Two constructions were used, divided in 36 barns, each one with 15 animals, 110 to 150 days old. Along a side of one barn, four cooling devices were installed, with a ventilation system connected to a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ventilation; Thermal environment; Thermal comfort.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100003
Imagem não selecionada

Imprime registro no formato completo
Prevalence of upper respiratory diseases and associated factors in Colombian Creole horses Arq. Bras. Med. Vet. Zootec.
Jaramillo,C.; Gutierrez,M.P. Arias.
ABSTRACT To determine the prevalence of diseases of the upper respiratory tract and associated factors in the Colombian Creole Horse Valley Aburrá in 2015, a random sampling of 15 farms in southern Aburrá Valley under different management conditions was performed. A total of 105 CCC underwent general clinical examination, respiratory endoscopic evaluation and a detailed inspection of housing conditions and management. A low prevalence of upper respiratory tract diseases was observed, including Pharyngeal Lymphoid Hyperplasia 38.1%, Recurrent Laryngeal Neurophaty 12.38%, Dorsal Displacement of the Soft Palate 7.62%, and presence of tracheal secretions not associated with a specific pathology. A bivariate analysis showed association between tracheal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Equine; Respiratory diseases; Handling; Ventilation.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352018000200333
Imagem não selecionada

Imprime registro no formato completo
Radiocarbon Evidence for the Contribution of the Southern Indian Ocean to the Evolution of Atmospheric CO 2 over the last 32,000 years ArchiMer
Ronge, Thomas A.; Prange, M.; Mollenhauer, Gesine; Ellinghausen, Maret; Kuhn, G.; Tiedemann, R..
It is widely assumed that the ventilation of the Southern Ocean played a crucial role in driving glacial‐interglacial atmospheric CO2‐levels. So far however, ventilation records from the Indian sector of the Southern Ocean, are widely missing. Here we present reconstructions of water residence times (depicted as ΔΔ14C and Δδ13C) for the last 32,000 years on sediment records from the Kerguelen Plateau and the Conrad Rise (~570‐2500 m water depth), along with simulated changes in ocean stratification from a transient climate model experiment. Our data indicate that Circumpolar Deep Waters in the Indian Ocean were part of the glacial carbon pool. At our sites, close to or bathed by upwelling deep‐waters, we find two pulses of decreasing ΔΔ14C and δ13C values...
Tipo: Text Palavras-chave: Radiocarbon; Ventilation; Southern Ocean; Younger Dryas; Carbon cycle; Indian Ocean.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00611/72351/71258.pdf
Imagem não selecionada

Imprime registro no formato completo
Relationship between ventilation heterogeneity and exercise intolerance in adults with sickle cell anemia BJMBR
Lopes,A.J.; Marinho,C.L.; Alves,U.D.; Gonçalves,C.E.A.; Silva,P.O.; Botelho,E.C.; Bedirian,R.; Soares,A.R.; Maioli,M.C.P..
Sickle cell anemia (SCA) causes dysfunction of multiple organs, with pulmonary involvement as a major cause of mortality. Recently, there has been growing interest in the nitrogen single-breath washout (N2SBW) test, which is able to detect ventilation heterogeneity and small airway disease when the results of other pulmonary function tests (PFTs) are still normal. Thus, the objectives of the present study were to assess the heterogeneity in the ventilation distribution in adults with SCA and to determine the association between the ventilation distribution and the clinical, cardiovascular, and radiological findings. This cross-sectional study included 38 adults with SCA who underwent PFTs, echocardiography, computed tomography (CT), and 6-min walk test. To...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sickle cell anemia; Respiratory mechanics; Respiratory function tests; Ventilation; Exercise.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000800607
Imagem não selecionada

Imprime registro no formato completo
Role of nitric oxide in hypoxia-induced hyperventilation and hypothermia: participation of the locus coeruleus BJMBR
Fabris,G.; Anselmo-Franci,J.A.; Branco,L.G.S..
Hypoxia elicits hyperventilation and hypothermia, but the mechanisms involved are not well understood. The nitric oxide (NO) pathway is involved in hypoxia-induced hypothermia and hyperventilation, and works as a neuromodulator in the central nervous system, including the locus coeruleus (LC), which is a noradrenergic nucleus in the pons. The LC plays a role in a number of stress-induced responses, but its participation in the control of breathing and thermoregulation is unclear. Thus, in the present study, we tested the hypothesis that LC plays a role in the hypoxia-induced hypothermia and hyperventilation, and that NO is involved in these responses. Electrolytic lesions were performed bilaterally within the LC in awake unrestrained adult male Wistar rats...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitric oxide; Locus coeruleus; Hypoxia; Ventilation; Body temperature; Rat.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001100009
Registros recuperados: 25
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional