Abstract
SUMMARYFilaments of Zygnema were blended 3 min in a buffered sucrose solution, and a pyrenoid‐rich cell fraction was obtained by filtration through a 10‐μ filter. The filtrate was placed on a 35%/40%/50% (wt/wt) discontinuous sucrose density gradient and was spun at approximately 50,000 × g for 1/2–1 hr. Pyrenoids, which were collected at the 40%/50% interface, appeared with light microscopy to be firm, intact, spherical, colorless refractive bodies. Although in situ pyrenoids stained with propionocarmine, isolated pyrenoids would not stain, indicating a change in the chemical properties of pyrenoids during the isolation procedure.
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