What happens below the cellular level when the heart contracts and relaxes has long been unexplored. Thanks to new ultra-high-resolution electron microscopy techniques, scientists can now watch the ...

Spermatozoal ultrastructure endorses other evidence that Ascaphus is the sister-group of all other anurans. Primitive (plesiomorphic) features of the sperm of Ascaphus, shared with those of urodeles ...

This is a preview. Log in through your library . Abstract Petals in Ranunculales are nectariferous organs referred to as "nectary leaves" and show diversity in shape, color and structure due to ...