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