Paul Chrystal

@pwchrystal.bsky.social

Research Associate at University of Toronto studying inherited retinal dystrophy.

“Lost media” no longer! I finally got permission to upload “AL’S BRAIN,” an 11-minute educational 3-D film attraction which ran at the Orange County and Western Washington fairs, and hasn’t been seen publicly since 2009. You can watch the whole thing here: youtu.be/2xujU87ZHt4

Biochemist Florence Seibert developed the Purified Protein Derivative (PPD) in the 1930s. Before her work, TB skin tests were inconsistent & unreliable. Her PPD formula was adopted as the international standard (1952) & remains in use for TB testing today. Died #OTD in 1991. #WomenInSTEM

Vintage black-and-white studio portrait of American biochemist Florence Barbara Seibert (1897–1991), shown from the shoulders up. The young woman has short, dark, wavy 1920s-style hair parted on the side, wears round wire-rimmed eyeglasses, and offers a gentle smile toward the camera. She is dressed in a light-colored blouse with a ruffled collar. A studio imprint reading “A. F. R. S. Chicago” appears in the lower right corner.

Congratulations to Ishmael Majeed from the Tropepe lab who successfully defended his Masters degree! Ishmael has been critical to developing new behavioural tests for visual function testing in our zebrafish mutants. Best of luck with your future graduate studies, Ishmael.