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.
One in three people in the U.S. knows someone who has been shot. 1 On average, 31 Americans are murdered with guns every day and 151 are treated for a gun assault in an emergency room. 2 Every day on average, 55 people kill themselves with a firearm, and 46 people are shot or killed in an accident with a gun. 3 The U.S. firearm homicide rate is 20 times higher than the combined rates of 22 countries that are our peers in wealth and population. 4