An integrated stratigraphic analysis of the Coimbra Formation was performed in S. Pedro de Moel outcrops Lusitanian Basin (Portugal). This unit is dated from lower–upper (Oxynotum Chronozone) Sinemurian and subdivided into eight informal subunits. Except for its base, consisting dolostones microbialites, much succession consists bioclastic bioturbated micritic centimetric–decimetric limestones ...

The colorless alga Polytoma obtusum has been found to possess leucoplasts, and two kinds of ribosomes with sedimentation values of 73S and 79S. The ribosomal RNA (rRNA) of the 73S but not the 79S ribosomes was shown to hybridize with the leucoplast DNA (rho - 1.682 g/ml). Nuclear DNA of Polytoma (rho = 1.711) showed specific hybridization with rRNA from the 79S ribosomes. Saturation hybridizati...

Electron microscopic observations of flagella and cilia have indicated a constancy in the number of peripheral and axial fibrils seen in cross-sections (1-3) and a variability in the structure and form of the basal bodies and accessory structures in different organisms (4-8, 17). During recent electron microscope studies of plastids in colorless flagellates (9), observations were made of an add...

BACKGROUND AND AIMS Anthurium is an important horticultural crop from the family Araceae, order Alismatales, a lineage considered to have diverged from other monocots prior to the cereals. Genome size and its distribution in Anthurium were investigated to gain a basic understanding of genome organization in this large genus and to forge a firm foundation for advancement of molecular approaches ...

Peatlands play an important role in the global carbon cycle but have been exploited over many centuries, which reduces their storage capacity. To investigate peatland development during late Holocene and restoration after peat extraction, we applied a multi-proxy paleoecological (pollen, plant macrofossils, testate amoebae, loss on ignition, humification, etc.) approach to undisturbed floating ...

We reported previously that Trichophyton mentagrophytes contains a cytoplasmic macromolecule which specifically binds progesterone. Progesterone is also an effective inhibitor of growth of the fungus. We report here studies which characterize more fully the specific binding properties and the functional responses of T. mentagrophytes and taxonomically related fungi to a series of mammalian ster...