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Changes in perception and unusual hallucinatory responses are two of the effects produced by peyote . " Ash " in this sense is quite distinct from the ash produced by common combustion because the rocks do not catch fire and burn during a volcanic event . Certain elements used as alloying agents in steel impart characteristic and recognizable variations in the sparks produced by basic carbon steel . The compounds produced by genetically engineered pharma plants are expected to lead to useful products that would have benefi cial effects on human or animal health . The Provost receives all reports ; any regarded as critical of the institution are referred by the Head of the Examinations Office to the Vice-Chancellor , who also receives all reports produced by EdExcel .