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Biomedical subjects

R P Allen

Publications and source records attributed to R P Allen.

At least 91 records · Page 5Linked to original sources
PubMed1975

Growth rebound after termination of stimulant drugs.

To explore further the report of an accelerated weight gain following termination of treatment with a stimulant drug, 66 biannual growth measurements were obtained from 1970 to 1973 on hyperactive schoolchildren who were receiving medication. All received either dextroamphetamine or methylphenidate during the school year; some also received it during the summer. The data revealed that those whose stimulant medication was terminated at the start of summer subsequently grew in weight and height at a significantly greater rate than those who continued to receive medication from June to September. In fact, discontinuance of the medication resulted in a growth rebound for this period which was 15-68% above the age-expected increment.

Adolescent↗
PubMed1975

Alpha fetoprotein: effect of heterologous antiserum on hepatoma cells in vitro.

Hepatoma cells derived from The Jackson Laboratory mouse hepatoma BW7756 synthesized alpha fetoprotein (AFP) in vitro. The AFP was immunologically identical to that circulating in the sera of hepatoma-bearing mice. An in vitro cytotoxic effect of rabbit antiserum to AFP was studied in hepatoma cells obtained both from fresh cell suspensions and short-term cell culture. The use of intact and/or inactivated anti-AFP serum inhibited the growth of the AFP-producing cells. The cytotoxic effects of the antiserum depended on exposure time and serum concentration. The cytotoxicity was complement independent, as demonstrated by studies with heat-deactivated serum devoid of extrinsic complement. The control target cells included fresh cell suspensions of normal mouse liver and mouse muscle fibroblasts grown in short-term culture. Specificity of the antisera for the target cells was demonstrated by absorption with purified mouse AFP. The results could be explained by the presence of AFP on the hepatoma cell surface.

Animals↗
PubMed1975

Stimulant drug treatment of hyperactive adolescents.

The characteristics and classroom behavior changes of hyperactive (HA) school children treated with stimulants during the years, 1969-1974, were evaluated in relation to the age of the child. Fourteen children who began taking stimulants before age 8 were compared to 11 who were initiated on stimulant treatment at age 13-16. Next, 13 children who continued on stimulants into their teens were studied to compare their pre-teen with their teenage drug response. The major findings were: 1) The therapeutic response of stimulants for hyperactivity did not significantly change from age 6 to age 16. 2) Pre-treatment teacher ratings indicated that as a group, teenage HA children were as inattentive as younger HA children, but less aggressive and overactive. 3) The mean dose of stimulant medication to achieve a successful classroom response for school age HA children did not significantly increase with age. 4) Parental resistances to stimulants were not related to the age of the HA child, but behavioral resistances by the child increased significantly during the teens. 5) There were no reports of abuse of stimulants by HA teenagers.

Adolescent↗