Figure 6.

Confocal Nomarski micrograph of a sycamore cultured cell after 18 h incubation in culture medium containing 10¹⁴ CdSe/ZnS quantum dots per ml and 1 mg ml⁻¹ d-TR. Cell was observed using an excitation wavelength of 488 nm and emission window of 500–540 nm for CdSe/ZnS fluorescence (A); 543 nm excitation and emission window of 560–700 nm for Texas-Red (B); and white light (C). (D) is a superimposed image of (A–C) showing the sequestration of CdSe/ZnS quantum dots away from the vacuole filled with d-TR.