In this learning activity you'll observe the growth of gram negative organisms and determine if they're lactose positive or negative.

Learners examine the operation of positive and non-positive displacement compressors used in pneumatic systems.

In this interactive object, the learner practices identifying charges on ions.

In this overview, students examine and identify mannitol positive and mannitol negative bacteria on mannitol salt agar.

This learning activity explains how site structure and organization can have a positive effect on optimization and driving traffic to your website.

Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).

Learners will write effective business messages that incorporate a second-person point of view and focus on the benefit to the reader. This approach is often used to create positive messages, neutral messages, and inquiry messages in business settings.

In this animated object, learners examine how various types of positive and non-positive displacement hydraulic pumps work.

Learners will determine if they are satisfied with their attitudes and then rank tips for regaining a positive disposition in the workplace.