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NITZCHIA SIGMA:

This diatom reveals striae at as low as 20X; areolae are suggested at 40X, but clear at 100X.

N. sigma oblique illumination
N. sigma 20X objective oblique illumination

N. sigma oblique illumination
N. sigma 40X objective oblique illumination.


N. sigma 40X DIC illumination
N. sigma 40X objective NIC.


N. sigma 100X NIC
N. sigma 100X S-Plan objective NIC.