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Action Spectrum Obtained Working Method Tw Engelmann Spirogyra

The atrioventricular valves are regulated by Chordae Tendinae, fibrous cords connecting the valve flaps to papillary muscles in the ventricular wall.

Atrioventricular valves are regulated by fibrous cords called Chordae Tendinae, which attach the valve flaps to extensions of the ventricular wall known as Papillary Muscles.

Front First action spectrum was obtained by [....] while working on [....]
also what was his method?
Back TW. Engelmann
Spirogyra
aerobic bacteria moved towards part of algal filamnet emitting most Oxygen.

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