PubMed Health⌕ Search

Biomedical subjects

S Payton

Publications and source records attributed to S Payton.

6 recordsLinked to original sources
PubMed1996

Ethylene receptor expression is regulated during fruit ripening, flower senescence and abscission.

Using the Arabidopsis ethylene receptor ETR1 as a probe, we have isolated a tomato homologue (tETR) from a ripening cDNA library. The predicted amino acid sequence is 70% identical to ETR1 and homologous to a variety of bacterial two component response regulators over the histidine kinase domain. Sequencing of four separate cDNAs indicates that tETR lacks the carboxyl terminal response domain and is identical to that encoded by the tomato Never ripe gene. Ribonuclease protection showed tETR mRNA was undetectable in unripe fruit or pre-senescent flowers, increased in abundance during the early stages of ripening, flower senescence, and in abscission zones, and was greatly reduced in fruit of ripening mutants deficient in ethylene synthesis or response. These results suggest that changes in ethylene sensitivity are mediated by modulation of receptor levels during development.

Amino Acid Sequence↗
PubMed1993

A histidine decarboxylase-like mRNA is involved in tomato fruit ripening.

DNA sequencing of a tomato ripening-related cDNA, TOM 92, revealed an open reading frame with homology to several pyridoxal 5'-phosphate histidine decarboxylases, containing the conserved amino acid residues known to bind pyridoxal phosphate and alpha-fluoromethylhistidine, an inhibitor of enzyme activity. TOM 92 mRNA accumulated during early fruit ripening and then declined. Fruit of the ripening-impaired tomato mutant, ripening inhibitor (rin), did not accumulate TOM 92 mRNA, and its accumulation was not restored by treatment of fruit with ethylene. The TOM 92 mRNA was not detected in tomato leaves and unripe fruit.

Amino Acid Sequence↗
PubMed1992

The concept of the person in the parens patriae jurisdiction over previously competent persons.

This article reviews the medieval law background of the parens patriae jurisdiction of the state as it has been exercised over incompetent persons who formerly were competent adults, concluding that the fiduciary standard implied in the statute De Prerogative Regis (1324), which is the basis for modern guardianship status, requires that the court and guardian adopt an attitude of respectful friendship toward the incompetent person, just as though they were to be accountable to the person himself, were he to recover his faculties and become competent once more. This fiduciary responsibility, originating in the device of the "use" or trust employed for the management of the estates of lunatics, contrasts with the self-interested feudal guardianship used for the custody of "natural fools" or "idiots", who were under paternalistic arrangements. The article argues that because the determination of legal incompetence and the consequent transfer of custody of the person and property of an incompetent person to the state would result in a drastic forfeiture of liberty and property interests were it not for the fiduciary obligation owed by the state to the incompetent, the state is under an obligation to exercise its fiduciary duties in good faith and may not impose states policies or advance state interests of its own in the supervision of the affairs of incompetent persons, apart from interests arising legitimately out of the state's institutional interest in providing competent administration for the benefit of the incompetents themselves.

Advance Directives↗