activator - (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription. 1  substance - the real physical matter of which a person or thing consists; DNA is the substance of our genes.
In 2006, in cases where police officers intentionally fired a gun at a person, they discharged 364 bullets and hit their target 103 times, for a hit rate of 28.3 percent, according to the departmentâs Firearms Discharge Report. The police shot and killed 13 people last year. In 2005, officers fired 472 times in the same circumstances, hitting their mark 82 times, for a 17.4 percent hit rate. They shot and killed nine people that year.
Police officers in the United States have shot and killed at least 500 people so far in 2015, according to a Washington Post analysis.The 500th gun death at the hands of police officers came Thursday night in Boulder Creek, Calif., after officers were dispatched to a home on reports of a family fight.n Tuesday, officers across the country shot and killed eight people, the most police shootings that have occurred on any single day in 2015. The number of people shot and killed so far this year tracked by The Post easily exceeds the figures reported by the FBI for any single year since 1976.