BACKGROUND INFORMATION

BACTERIA

Bacteria are unicellular prokaryotic organisms; they lack a nucleus. They have very short life spans varying between minutes and days. Bacteria are the oldest living beings on Earth and they can be found everywhere even on the air we breathe.

Bacteria have a very fast reproduction process and that’s the reason of its short life span. They reproduce asexually by binary fission. (Microinmuno.qb.fcen.uba.ar, 2014)

The necessary conditions for a suitable culture of bacteria are: temperature, amount of humidity, pressure, light, gas presence, the sterility of the means and acidity. It has to contain the necessary nutrients, growth factors and be extent of pollutant microorganisms.

SOLUTION

A solution is a homogeneous mixture of two or more substances. The solutions are formed by the solute and the solvent (usually a lesser amount solute solvent).

Solution = solute + solvent

• Solute: A substance that is dissolved in another.
• Solvent: A substance or liquid capable of dissolving a body or other substance (the solute).

Example: A sugar cube in a glass of water. Sugar would solute and solvent water.

(Chem.purdue.edu, 2014)