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Biomedical subjects

A Murphy

Publications and source records attributed to A Murphy.

26 records · Page 2Linked to original sources
PubMed1977

Transmission of rotavirus gastroenteritis from children to a monkey.

A pooled suspension of rotavirus was prepared from the stools of eight children with acute non-bacterial gastroenteritis. The suspension was infused into the duodenum and stomach of an infant monkey (Nemestrina macaque). Biopsy samples of duodenal mucosa were taken at several intervals after inoculation, examined by light and electron microscopy, and assayed for lysosomal activity. Virus-like particles were seen within and around microvilli and intracellularly within vesicles as early as 20 minutes after the infusion. On the fourth and fifth days, large lysosomal bodies containing numerous virus-like particles were found within epithelial cells of the duodenal villi. No such particles were seen in the pre-inoculation sample or at days 16 or 25 after infection. The present study would appear to be the first demonstration of the transmission of this human virus to another species.

Animals↗
PubMed1977

Assessment of counseling practices at the birth of a child with Down's syndrome.

An attempt was made to analyze 414 parents' perceptions of their experiences at the birth of their child with Down's syndrome. The interpretation of the results and the parents' comments suggest that the counseling of parents with a newborn Down's syndrome child demands tact, truthfulness, and empathetic guidance. The parents should be informed of the child's condition in a kind and sensitive manner as soon as the diagnosis of Down's syndrome has been made. Appropriate terminology should be employed, and both parents should be present when the physician tells them of their misfortune. Unconditional recommendations of institutionalization of the child with Down's syndrome should be practices of the past. The professionals' thoughtful considerations and mature counsel should assist constructively in shaping the child's future.

Adolescent↗
PubMed1976

Status of tRNA charging, trinucleotide acceptor sequence and tRNA nucleotidyltransferase activity in the human placenta.

Samples of tRNA isolated from the cell sap of full-term human placenta were found to have a low capacity for accepting amino acids in the presence of partially purified synthetase preparations made from placental or rat liver cell sap. Gel electrophoresis of placental tRNA showed that part of this could be accounted for by gross degradation. The proportion of chargeable tRNA carrying amino acids was estimated by periodate oxidation followed by stripping and then charging with labeled amino acids. Only 50% of chargeable placental tRNA was in the charged state when isolated, whereas 87% of freshly isolated rat liver tRNA was found to be charged with amino acids. A fraction from placental cell sap was shown to have tRNA nucleotidyltransferase activity. When placental tRNA was incubated with this fraction and [3H]ATP or [3H]CTP, ATP was incorporated into about 12% of the tRNA molecules and CTP into 5-7%. When rat liver tRNA was used in place of placental tRNA, [3H]ATP was incorporated into less than 5% of the tRNA molecules. By using snake-venom diesterase over short periods of incubation, it was confirmed that the ATP had been incorporated terminally as AMP into the placental tRNA. These observations show that, in contrast to rat liver tRNA, tRNA prepared from human placenta is poorly charged with amino acids, many of the molecules lack the acceptor trinucleotide and there is extensive degradation beyond this stage.

Amino Acyl-tRNA Synthetases↗
PubMed1975

Counseling parents of infants with Down's syndrome.

The primary objective in counseling parents of a child with Down's syndrome is to secure realistic goals and an accepted place in the family for the child. A nurturing environment gives the child the best chance to reach full potential.

Child, Preschool↗