Encontrados 12 documentos, a visualizar página 1 de 2
Implicit solutions with consistent additive and multiplicative components
Areias, Pedro; Rabczuk, T.; Dias-da-Costa c, D.d,; Pires, E.B.Use of multiple-point-constraints
Quantificação dos níveis endógenos de auxinas e da actividade enzimática das po...
Serra, C.; Antunes, R.; Hegewald, H.; Teixeira da Costa, C.; Pinto, A.P.; Peixe, A.A actividade enzimática de polifenoloxidases foi avaliada em folhas e na zona apical, média e basal de ramos de duas cultivares de oliveira (Olea europaea L.), comuns no Alentejo ( Galega vulgar e Cobrançosa ), mostrando que a actividade enzimática nas folhas foi muito superior à encontrada em tecidos de ramos do ano. Maior actividade enzimática foi também detectada na variedade Cobrançosa versus Galega vu...
Fecal estradiol and progesterone metabolite levels in the three-toed sloth (Bra...
Mühlbauer,M.; Duarte,D.P.F.; Gilmore,D.P.; da Costa,C.P.The present study was carried out to assess the possibility of measuring fecal steroid hormone metabolites as a noninvasive technique for monitoring reproductive function in the three-toed sloth, Bradypus variegatus. Levels of the estradiol (E2) and progesterone (P4) metabolites were measured by radioimmunoassay in fecal samples collected over 12 weeks from 4 captive female B. variegatus sloths. The validation ...
Electrocardiographic studies of the three-toed sloth, Bradypus variegatus
Silva,E.M.; Duarte,D.P.F.; da Costa,C.P.Electrocardiograms (ECG) obtained with standard limb leads and augmented unipolar limb leads were recorded from 17 unanesthetized adult sloths. The animals were held in their habitual position in an experimental chair. We determined heart rate and rhythm from the R-R intervals, the amplitude and duration of each wave, and the duration of the segments and intervals of the ECG. The mean electrical axes of P and T...
Cardiovascular responses to locomotor activity and feeding in unrestrained thre...
Duarte,D.P.F.; Jaguaribe,A.M.; Pedrosa,M.A.C.; Clementino,A.C.C.R.; Barbosa,A.A.; Silva,A.F.V.; Gilmore,D.P.; Da Costa,C.P.Heart rate (HR) and systolic (SBP), diastolic (DBP) and mean (MBP) blood pressure were recorded by biotelemetry in nine conscious unrestrained sloths for 1 min every 15 min over a 24-h period. The animals were allowed to freely move in an acoustically isolated and temperature-controlled (24 ± 1ºC) experimental room with light-dark cycle (12/12 h). Behavior was closely monitored through a unidirectional visor an...
Circadian rhythms in blood pressure in free-ranging three-toed sloths (Bradypus...
Duarte,D.P.F.; Silva,V.L.; Jaguaribe,A.M.; Gilmore,D.P.; Da Costa,C.P.Blood pressure (BP) profiles were monitored in nine free-ranging sloths (Bradypus variegatus) by coupling one common carotid artery to a BP telemetry transmitter. Animals moved freely in an isolated and temperature-controlled room (24ºC) with 12/12-h artificial light-dark cycles and behaviors were observed during resting, eating and moving. Systolic (SBP) and diastolic (DBP) blood pressures were sampled for 1 m...
The effect of feeding on the respiratory activity of the sloth
Pedrosa,M.A.C.; Lima,A.M.J.; Bezerra,A.P.; Duarte,D.P.F.; Da-Costa,C.P.The aim of the present study was to confirm whether feeding influences the resting breathing rate and to observe possible alterations in blood gas and pH levels produced by feeding in unanesthetized sloths (Bradypus variegatus). Five adult male sloths (4.1 ± 0.6 kg) were placed daily in an experimental chair for a period of at least 4 h for sitting adaptation. Five measurements were made for each sloth. However...
Sloth biology: an update on their physiological ecology, behavior and role as v...
Gilmore,D.P.; Da Costa,C.P.; Duarte,D.P.F.This is a review of the research undertaken since 1971 on the behavior and physiological ecology of sloths. The animals exhibit numerous fascinating features. Sloth hair is extremely specialized for a wet tropical environment and contains symbiotic algae. Activity shows circadian and seasonal variation. Nutrients derived from the food, particularly in Bradypus, only barely match the requirements for energy expe...
An update on the physiology of two- and three-toed sloths
Gilmore,D.P.; Da-Costa,C.P.; Duarte,D.P.F.Physiological and pharmacological research undertaken on sloths during the past 30 years is comprehensively reviewed. This includes the numerous studies carried out upon the respiratory and cardiovascular systems, anesthesia, blood chemistry, neuromuscular responses, the brain and spinal cord, vision, sleeping and waking, water balance and kidney function and reproduction. Similarities and differences between t...
Dinâmica da regulação dos estádios de consciência no primeiro mês de vida.
Gomes Pedro, J; Bento de Almeida, J; Silveira da Costa, C; Barbosa, A; Torgal, F
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