Ontogeny, allometry and architecture of Psychotria tenuinervis (Rubiaceae)

Cytotoxic activity of polyindoline alkaloids of Psychotria forsteriana (Rubiaceae) (1).

Absence of alkaloids in Psychotria carthagenensis Jacq. (Rubiaceae).

Psychotria viridis and P. carthagenensis are often discussed in relation to the hallucinogenic beverage Ayahuasca, used for religious, medicinal and social purposes. The significance of including Psychotria species in this beverage has been understood on the basis of substantial amounts of tryptamine alkaloids detected on leaves of both P. viridis and P. carthagenensis. Nevertheless, there is a...

Raphide crystal cell development in leaves of Psychotria punctata (Rubiaceae).

The distribution and development of raphide cry8tal cells in nodulated leaves of Psychotria punctata were studied by light and electron microscopy. Crystal cells in the leaf are oriented in various ways depending on whether they occur in the spongy or palisade parenchyma. Crystals are never found within the bacterial nodules and are not concentrated around them. Developing leaf crystal cells be...

Allometry and size in ontogeny and phylogeny.

architecture and engineering of nanoscale sculptured thin films and determination of their properties

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