STUDIES ON THE PHOTODYNAMIC ACTION 11TH REPORT

Report on the 11th EASD

The Photodynamic Action of Light on Hydra.

Hydra were known to react to light as early as 1744 when Trembley first described their movement towards a light source. This migration of the animal was then further elucidated by Wilson in 1891, who found that Hydra viridis and fusca are maximally sensitive to blue light. Haug ( ' 3 3 ) found that Hydra will react to a light stimulus by contracting first and then orienting; and Rushforth, Bur...

Photodynamic action of the red laser on Propionibacterium acnes*

BACKGROUND Photodynamic therapy is a therapeutic modality that has consolidated its activity in the photooxidation of organic matter, which arises from the activity of reactive oxygen species. OBJECTIVE To evaluate the effect of red laser 660nm with the photosensitizer methylene blue on Propionibacterium acnes in vitro. METHOD The experimental design was distributed into four groups (1 - co...

The Role of Radiation in Photodynamic Action

The literature concerned with photodynamic action is surprisingly reticent upon the subject of the role played by the radiation used to induce the effect. It is tacitly assumed that the radiation,plays its part solely via the so-called 'sensitizing' agent. The possibility of direct action upon the test material appears to have been ignored. Recently (Calcutt, 1950), evidence has been put forwar...

Studies on Enzyme Action

The hydrolyzing actions of various preparations of the adult eel were studied on ten esters in the usual way. The results are presented in the form of curves for the relative actions and in a table for the absolute actions obtained in one complete experiment. The separation of the enzyme material in some cases into an active portion and a co-enzyme, the mixture showing greater actions on some e...