bio233, microscope lab, morphology

I let students use masked slides to prepare them for practical exams.

Rod and spirilum are often hard to distinguish, especially when cells are pressed during the fixation process. The key is the 'typical' shape.
The rod bacillus cells are often chained together like bamboos. The spirilum can be curly like chained sausages.

Some student focused on the lens. I showed them to move the stage to distinguish dirty lens from slides.

A couple students cannot focus on sample and use the coarse adjustment for fine turing. Some spun unnecessarily. It seemed that most people tend to rotate in the right-hand direction. So when the left-hand rotation is needed for adjustment, student often fumble.

Some sample gram-stain slides started to fade. New slides should be ordered.