Articles in scientific journals are called "primary literature". They report the actual study or experiment, the results and conclusions from those results. In the sciences, they usually have been "peer reviewed" - that is deemed worthy of publication by a committee of scientists in the field.
You should approach reading an article in a science research journal with a purpose and a plan. This process is outlined in the, How to Read a Scientific Paper tutorial from Purdue University linked below.
How to Read a Scientific Paper - Purdue Tutorial