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Ultrastructural studies on the female gametophyte are restricted to species at relatively derived positions in the angiosperm phylogenetic tree. Therefore, this topic remains mostly unknown for the early-divergent lineages, in which a four-celled megagametophyte is common. Here, ultrastructure of the megagametophyte and micropylar nucellar epidermis was investigated in Cabomba caroliniana A. Gray...
Anther and pollen development in staminate and pistillate flowers of dioecious Melicoccus lepidopetalus (Sapindaceae) were examined by light and electron microscopy. Young anthers are similar in both types of flowers; they consist of epidermis, endothecium, two to four middle layers and a secretory tapetum. The microspore tetrads are tetrahedral. The mature anther in staminate flowers presents compressed...
In this study, we investigated whether dendritic cells (DCs) are altered in classic Kaposi's sarcoma (cKS), a lympho-angioproliferative disorder associated with human herpesvirus-8 (HHV-8) infection. By direct analysis of peripheral blood DCs (PBDCs), we demonstrated that cKS patients have lower frequency of myeloid and plasmacytoid DCs than controls. This reduction was greater in patients with advanced...
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