Biomedical subjects

M G Peter

Publications and source records attributed to M G Peter.

20 records · Page 2Linked to original sources

PubMedDate not supplied

The juvenile hormones in blood of larvae and adults of Manduca sexta (Joh.).

The juvenile hormones (JH) in extracts of Manduca sexta blood were converted to 10-(2,4-dichlorobenzoyloxy)-11-methoxy derivatives and quantitatively determined by gas chromatography with electron capture detection. Early IVth instar larvae contained 0.62 ng JH-I, 1.1ng JH-II and 0.07 ng JH-III per ml blood. Early Vth instar larvae, and adult of both sexes contained the hormones in concentration from 0 to 0.24 ng/ml blood. No hormone was detected in late Vth instar (wandering) larvae. The detection limit in our experiments was less than or equal to 0.003 ng/ml blood.

Age Factors↗

PubMedDate not supplied

[Reactions of nascent quinones with methyl beta-alanate in glacial acetic acid and in aqueous solution (author's transl)].

In order to generate a model for the reaction of proteins with nascent quinones, catechol and 4-methylcatechol were oxidized with silver-I-oxide in glacial acetic acid or with mushroom tyrosinase (EC 1.10.3.1) in phosphate buffer, respectively. The structures identified indicate that not only the amine reacts with the quinone by the well known addition-oxidation-mechanism, but also that solvent molecules may participate in product formation. The main product of the oxidation of catechol in glacial acid is N-(2-carbomethoxyethyl)-phenoxaz-2,3-dione.

Acetates↗