In a typical expression vector, the polyhedrin (polh) gene, which codes for the major protein in the occluded form of the virus, is replaced by a transgene of interest. The transgene can then be expressed under the control of the polh promoter to achieve maximal protein expression in their natural hosts, insect cells.
Commercial rubber is a product that is important to the convenience of our everyday lives. We find it in our tires, our shoes, our flooring, adhesives, and in a plethora of small items that are all made from rubberâwhile the products themselves may be small in size, their significance is usually much larger. In any case, rubber is made from two main sources: naturally-produced latex and petroleum.
Running along the inner edges of a tire are the beads. Beads are high-strength steel, coated in rubber, which gives tires strength while also helping to hold the tire to the wheel. The body of the tire is actually made up of fabric, not rubber. The body is built from layers of fabric (each layer is called a ply).The plies aren't your run-of-the-mill cotton fabric; they're usually a strong composite material.The plies are coated with rubber, not only to help them hold air inside, but also to help them bond to the other parts of the tire.he final part of the tire is the tread. The tread is on the outer edge of the tire. Like the sidewall, it's made of a mixture of natural and synthetic rubber.