The Zamiaceae are a family of cycads that are superficially palm or fern-like. They are divided into two subfamilies with eight genera and about 150 species in the tropical and warm temperate regions of Africa, Australia and North and South America.
The Zamiaceae are perennial, evergreen, and dioecious. They have subterranean to tall and erect, usually unbranched, cylindrical stems, and stems clad with persistent leaf bases (in Australian genera).
Their leaves are simply pinnate, spirally arranged, and interspersed with cataphylls. The leaflets are sometimes dichotomously divided. The leaflets occur with several sub-parallel, dichotomously-branching longitudinal veins; they lack a mid rib. Stomata occur either on both surfaces or undersurface only.
Astrocytes and synaptic plasticity Mon, 13 Oct 2008 00:00:00 -0400 (Rockefeller University Press) By mopping up excess neurotrophic factor from neuronal synapses, astrocytes may finely tune synaptic transmission to affect processes such as learning and memory, say Bergami et al. Their report is published in the Journal of Cell Biology. Body's anti-HIV drug explained Sun, 12 Oct 2008 00:00:00 -0400 (University of Southern California) Study in journal Nature reveals atomic structure of enzyme capable of repelling HIV virus, suggesting new approach for drug development. Pectin power Sun, 12 Oct 2008 00:00:00 -0400 (Norwich BioScience Institutes) Scientists from the UK's Institute of Food Research have found a new possible explanation for why people who eat more fruit and vegetables may gain protection against the spread of cancers.They have shown that a fragment released from pectin, found in all fruits and vegetables, binds to and is believed to inhibit galectin 3, a protein that plays a role in all stages of cancer progression.