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Biomedical subjects

A J Davis

Publications and source records attributed to A J Davis.

At least 181 records · Page 10Linked to original sources

Employed mothers and family day-care substitute caregivers: a comparative analysis of infant care.

Despite dramatic increases in recent decades in the number of employed mothers with children under 3 years of age and the greater utilization of nonmaternal child-care services (particularly unregulated family day care), little is known about the nature and quality of care provided to these infants by their employed mothers and substitute caregivers. This study was conducted to provide a comparative assessment of maternal and nonmaternal infant caregiving practices in own-home and unregulated family day-care homes, respectively. 30 caregivers (10 employed mothers, 10 substitute caregivers, and 10 nonemployed mothers) were observed in interaction with 5-6-month-old infants using Yarrow, Rubenstein, and Pedersen's Home Environment and Mother-Infant Interaction scales. While no differences were observed in the caregiving of employed and nonemployed mothers, both of these groups exceeded the sitters in socially mediated stimulation, contingent responsiveness, positive affect, and overall level and variety of social stimulation. In addition, employed mothers provided more tactile-kinesthetic, visual, and auditory stimulation to their infants than did the substitute caregivers. However, no differences were found between the infants reared in the home and day-care settings in Bayley Mental and Psychomotor developmental abilities. Evidence implicated group size (total number of children) in the quality of caregiving in family day-care homes. The impact of daily separations and qualitatively different caregiving experiences on infants is discussed.

Child Day Care Centers↗

Child care.

Explore the source record for details and available documents.

Child Care↗

Affinity for the dopamine D2 receptor predicts neuroleptic potency in blocking the reinforcing effect of MFB stimulation.

For each of nine neuroleptics, the dose required to block sustained responding for intracranial stimulation of the medial forebrain bundle was determined in the rat. To check whether the blocking of responding was due to effects on reinforcement as opposed to effects on performance factors, the rats were always tested for task-specific extinction of responding by transferring them to another testing box once they refused to respond in the first testing box. With all the neuroleptics, task-specific extinction was seen in at least some of the animals. Task-specific extinction was not seen in control tests with a general anaesthetic (Chloropent) nor with picrotoxin, a drug that can produce pseudo-extinction. Affinity for the dopamine D2 receptor (from in vitro studies) predicted neuroleptic potency in blocking reinforcement, whereas affinity for other aminergic receptors (D1, D3, the alpha-adrenergic receptor, S1, and S2) did not.

Animals↗

A study of fat absorption in cystic fibrosis patients and controls by a rapid micro procedure: a comparison with fecal fat excretion method.

Fat absorption was studied in 11 Cystic Fibrosis patients and 6 controls by measuring a) fecal fat excretion and b) serum turbidity using a nephelometer between 0 and 2 hours after a butter-fat load. Cystic Fibrosis patients showed a mean +/- SEM fecal fat excretion of 21.6 +/- 5.5%, and controls a mean of 2.7 +/- 0.45%, of the dietary fat. The turbidity change expressed as delta turbidity showed a mean value of 1.37 +/- 0.57 in Cystic Fibrosis patients and 31.8 +/- 5.7 in controls. Fecal fat excretion method showed a good negative correlation with the butter fat method. The butter fat absorption method was also compared with fecal fat excretion in rats with induced malabsorption and control rats. The results obtained were comparable to those in the patients. The method described here is rapid and can be performed with small blood volumes and therefore may be suitable to study fat malabsorption in pediatric patients.

Adolescent↗

Least restrictive alternative: ethical considerations.

Potential ethical dilemmas occur between rights and needs within the context of least restrictive alternative for psychiatric patients. This concept has been viewed primarily as a mechanism for limiting paternalistic interference and promoting individual dignity and autonomy. In addition, it has implied some possible conflicts in supporting such a well intentioned concept as least restrictive alternative without more reflection on the complexities involved.

Authoritarianism↗