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L Bovalini

Publications and source records attributed to L Bovalini.

33 records · Page 2Linked to original sources
PubMedDate not supplied

High performance liquid chromatography analysis of the furanochromones khellin and visnagin in various organs of Ammi visnaga (L.) Lam. at different developmental stages.

The content of the furanochromones khellin and visnagin, in the organs of Ammi visnaga (L.) Lam. at different developmental stages, has been examined. Determinations have been performed by means of a high performance liquid chromatography (HPLC) technique which allows both the separation and the quantitative determination of these chromones. Unripe fruits are the richest in both chromones, but the collection of ripe dry fruits--as it occurs in Egyptian folk-medicine--seems more reasonable because they might not undergo degradation processes during desiccation and storage.

Chromatography, High Pressure Liquid↗
PubMedDate not supplied

Inhibition of cAMP phosphodiesterase by some phototherapeutic agents.

The behaviour of cyclic-3',5'-AMP phosphodiesterase has been studied in the presence of psoralen, 8-methoxy-psoralen (8-MOP), 4,5',8-trimethylpsoralen (TMP) (usually used in PUVA therapy), 4,6,4'-trimethylangelicin (TMA) and khellin recently proposed for the same therapeutical use. TMP and TMA exhibit a significant inhibitory effect on cyclic AMP phosphodiesterase; a light inhibition is produced by khellin at rather high concentration.

3',5'-Cyclic-AMP Phosphodiesterases↗
PubMedDate not supplied

Kinetic properties and physiological regulation of NAD glycohydrolase.

Kinetic studies on horse spleen NAD-glycohydrolase demonstrate that the hydrolysis of NAD+ is extensively inhibited by physiological concentrations of nicotinamide and NADP+. These compounds act as reversibly released product and competitive inhibitor respectively.

Animals↗
PubMedDate not supplied

Occurrence of cyclic AMP and related enzymes during germination of Pinus pinea seeds.

The occurrence of cAMP, adenylate cyclase and cAMP phosphodiesterase has been tested in Pinus pinea seed during germination. The study has been carried out on dormant and imbibed seeds, seedlings, endospermic residues, roots and cotyledons. cAMP has been detected by the protein binding method and its occurrence has been verified by HPLC detections. cAMP phosphodiesterase shows a very high activity at acidic pH, while being completely inactive at pH 7.4. At this pH value, well detectable levels of adenylate cyclase have been observed. Therefore, the classical pathway of synthesis and breakdown of cAMP, already accepted for animal and bacterial cells, seems to be operating in Pinus pinea plant too.

3',5'-Cyclic-AMP Phosphodiesterases↗
PubMedDate not supplied

High performance liquid chromatography separation of the intermediates of pyridine coenzymes metabolism in Ricinus communis L. seedlings.

The metabolism of pyridine coenzymes is not yet well clarified in vegetable cells. We propose a HPLC method to separate the compounds involved in the pyridine nucleotides cycle in less than 32 min. The method has been applied to Ricinus communis seedlings. On the basis of the results obtained, the well known "de novo" and "salvage" pathways, demonstrated in other biological tissues for NAD biosynthesis, are likely to occur in this vegetable system.

Chromatography, High Pressure Liquid↗