An alternative to chlorine pools, the BioTop Natural Pools use plants to keep water clean and clear. Wikipedia has some more info on natural swimming pools as well. These could make a great addition to a permaculture design site.
karen margolis - 4 layers of abaca paper. holes made with soldering iron. I love the effect created with all these layers and the random arrangement of holes. It makes a very deep texture and a totally unique pattern.
A one-of-a-kind cell model for secondary students to construct from regular copy paper. Strong enough to hold up a textbook! A great alternative to gelatin cell models. Printable pattern and photo illustrated instructions included.
We provide different types of Industrial Air Cleaners which includes electrostatic units, cartridge units, HEPA units and media units in various configurations ranging from duct mounted, machine mounted and portable etc.
In this activity, students are expected to recognize and identify components of a cell membrane as well as construct a membranes correctly using cutouts of the components. After identifying and building the cell membrane, students will be given a set of concentration situations that they must set up using the cutout pieces.