MACROMOLECULAR COMPLEXES 



microspectrophotometer (Strother and Wolken, 1959). The photo- 

 sensitive element is a cadmium selenide photoconductive cell with 

 a light-sensitive surface measuring approximately 0.5 mm X 1 mm. 

 The photocell output is amplified by a transistorized dc amplifier 



400 500 600 



WAVE LENGTH IN mjJ 



700 



Fig. 3. Spectrum of Euglena chloroplastin (digitonin extract of chloroplasts), 

 from Beckman DK-1 recording spectrophotometer, compared to spectrum of 



Euglena chloroplast taken with microspectrophotometer , chloro- 



plast spectrum. , chloroplastin spectrum. 



and displayed on an oscilloscope used as a dc voltmeter. A grating 

 monochromator is used for illumination, and the microscope is fitted 

 with reflecting optics (Fig. 1). Absorption spectra are obtained by 

 plotting readings of the dc output of the photocell at selected wave 



