1. The raw materials for many of these synthetic substances come from crude oil. 2. Synthetic substances that are allowed include, for example, copper sulfate, elemental sulfur and Ivermectin.3. A second strategy could use a synthetic substance , perhaps similar to a product called biorubber. 4. Anabolic steroids is the common name for synthetic substances related to testosterone, the male sex hormone. 5. Other options are a partial repair, and reconstruction involving a bridge of biologic or synthetic substances . 6. Using carborundum ( Silicon carbide ) which is a synthetic substance manufactured using modern industrial techniques. 7. These generally have fillers ( wood flour, synthetic substances ) that will not take high temperatures. 8. Our olfactory environment has been radically altered by synthetic substances emerging from the labs of organic chemists. 9. Many of Hesse's constructions and installations are made of synthetic substances like latex, a form of liquid rubber. 10. A good model to assess in vivo effects on stem cell dynamics of natural and synthetic substances are planarian flatworms.
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