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 ...

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 ...

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 ...