Capillary Blood Flow in Frog Web

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Sample clip showing “Blood Flow in the Frog Web” taken from the David Barlow Film Archive. Film category, Microscopy : Blood flow in the frog web.

Differential interference contrast microscopy (DIC), high magnification view of blood flowing in capillaries in the web of juvenile clawed toads. The dark spots are melanocytes. When expanded, these pigmented cells darken the skin which is otherwise transparent. Blood flow through the capillary bed can be regulated through muscles in the larger vessels. These can contract or dilate the vessel to slow down or speed up blood flow depending on external conditions.

The David Barlow Special Effects Film Archive is a unique film and video library. It contains a comprehensive collection of moving images photographed by award winning cinematographer David Barlow. Clips are organised in a hierarchy of subjects and topics covering the following categories :

Animal Development
Human Development
Human Biology
Physiology
Parasitology
Microscopy
Landscapes
Computer Effects
Elements and Textures

David Barlow is a scientist and cinematographer. He has devised a number of scientific techniques for filming microscopic and endoscopic set-ups to achieve optimal visual results. David works to expand the archive of scientific film he has been compiling for 20 years. He also takes commissions to create visual effects sequences, specialising in complex simulated reconstructions of real phenomena on a miniature scale. He uses models and composites to cross the boundaries of scale and create special effects shots for high end TV documentary production.