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Aversive stimulation during the stress-hyporesponsive period does not affect the number of corticotroph cells in neonatal male rats BJMBR
Aguiar,C.E.; Cadore,L.P.; Padoin,M.J.; Barbosa-Coutinho,L.M.; Lucion,A.B..
Immunohistochemistry was used to evaluate the effects of neonatal handling and aversive stimulation during the first 10 days of life on the number of corticotrophs in the anterior lobe of the pituitary of 11-day-old male Wistar rats. Since adult rats handled during infancy respond with reduced corticosterone secretion in response to stressors and with less behavior inhibition in novel environments, we assumed that neonatal stimulation could affect pituitary morphology during this critical period of cell differentiation. Three groups of animals were studied: intact (no manipulation, N = 5), handled (N = 5) and stimulated (submitted to 3 different aversive stimuli, N = 5). The percentage of ACTH-immunoreactive cells in the anterior lobe of the pituitary...
Tipo: Info:eu-repo/semantics/article Palavras-chave: ACTH; Immunohistochemistry; Pituitary; Neonatal handling; Stress.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001200013
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Bioelectrical impedance spectroscopy for the assessment of body fluid volumes of term neonates BJMBR
Ferreira,D.M.; Souza,M.N..
The assessment of fluid volume in neonates by a noninvasive, inexpensive, and fast method can contribute significantly to increase the quality of neonatal care. The objective of the present study was to calibrate an acquisition system and software to estimate the bioelectrical impedance parameters obtained by a method of bioelectrical impedance spectroscopy based on step response and to develop specific equations for the neonatal population to determine body fluid compartments. Bioelectric impedance measurements were performed by a laboratory homemade instrument. The volumes were estimated in a clinical study on 30 full-term neonates at four different times during the first month of life. During the first 24 hours of life the total body water,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioelectrical impedance spectroscopy; Body water; Extracellular water; Intracellular water; Neonatal handling.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004001100002
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Brief daily postpartum separations from the litter alter dam response to psychostimulants and to stress BJMBR
Silveira,P.P.; Benetti,C. da Silva; Portella,A.K.; Diehl,L.A.; Molle,R. Dalle; Lucion,A.B.; Dalmaz,C..
Neonatal handling induces several behavioral and neurochemical alterations in pups, including decreased responses to stress and reduced fear in new environments. However, there are few reports in the literature concerning the behavioral effects of this neonatal intervention on the dams during the postpartum period. Therefore, the aim of the current study was to determine if brief postpartum separation from pups has a persistent impact on the dam's stress response and behavior. Litters were divided into two neonatal groups: 1) non-handled and 2) handled [10 min/day, from postnatal day (PND) 1 to 10]. Weaning occurred at PND 21 when behavioral tasks started to be applied to the dams, including sweet food ingestion (PND 21), forced swimming test (PND 28), and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding behavior; Neonatal handling; Psychostimulants; Stress response; Dam behavior.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000500426
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Neonatal handling induces anovulatory estrous cycles in rats BJMBR
Gomes,C.M.; Frantz,P.J.; Sanvitto,G.L.; Anselmo-Franci,J.A.; Lucion,A.B..
Since previous work has shown that stimulation early in life decreases sexual receptiveness as measured by the female lordosis quotient, we suggested that neonatal handling could affect the function of the hypothalamus-pituitary-gonadal axis. The effects of neonatal handling on the estrous cycle and ovulation were analyzed in adult rats. Two groups of animals were studied: intact (no manipulation, N = 10) and handled (N = 11). Pups were either handled daily for 1 min during the first 10 days of life or left undisturbed. At the age of 90 days, a vaginal smear was collected daily at 9:00 a.m. and analyzed for 29 days; at 9:00 a.m. on the day of estrus, animals were anesthetized with thiopental (40 mg/kg, ip), the ovaries were removed and the oviduct was...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Stress; Neonatal handling; Estrous cycle; Ovulation; Female rat.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001000010
Registros recuperados: 4
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