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.
Rubber is the name of a material which can stretch and shrink. It is a polymer. It can be either produced from natural sources (eg. natural rubber) or can be synthesised on a industrial scale. Lots of things are made from rubber, like gloves, tires, plugs, and masks and a few things can be made only from rubber. Natural rubber (latex rubber) is made from the white sap of some trees. There is a lot of it in the Hevea brasiliensis (Euphorbiaceae). Nowadays, synthetic rubber is made by a chemical process.