The rale which the transamination reaction plays in the metabolism of amino acids is not known exactly. The reaction was at first considered to be general and to involve most amino acids (1). However, results obtained in various laboratories suggested that transamination took place only with glutamic acid, aspartic acid, and alanine, and in a few cases with other amino acids (2-4). The developm...

In the genus Hypericum, cryoconservation offers a strategy for maintenance of remarkable biodiversity, emerging from large inter- and intra-specific variability in morphological and phytochemical characteristics. Long-term cryostorage thus represents a proper tool for preservation of genetic resources of endangered and threatened Hypericum species or new somaclonal variants with unique properti...

Hypericin and pseudohypericin were found in 27 of the 36 evaluated species from Hypericum L., belonging to 17 sections of the genus. Pseudohypericin is reported by us in 15 taxa for the first time. Most of the species contained both components and the amount of pseudohypericin usually exceeded that of hypericin. In H. hirsutum and H. empetrifolium only hypericin was found, whereas H. formosissi...