A common class of physics problems asks what happens to a quantity that depends on a certain parameter if that parameter changes by a given amount. Here is an approach to these problems:
Write down the formula that connects the dependent quantity
to the parameter that changes.
Write the formula twice:
Once with label 1.
Once with label 2.
Form a ratio of the two equations.
Insert the factor of change for the parameter expressed as a ratio.
Calculate the change in the dependent quantity.

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

small = small current large mag large current

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.