A biofilm is any group of microorganisms in which cells stick to each other and often also to a surface. These adherent cells become embedded within a slimy extracellular matrix that is composed of extracellular polymeric substances (EPS).
Career Requirements. Kindergarten teachers in public schools are required to have at least a bachelor's degree in education and teacher certification for the state in which they work. Certification typically requires candidates to complete student teaching requirements and pass any required professional exams.
Preschool teachers help young learners prepare for kindergarten through interactive play and games. Employment as a preschool teacher in a public school requires a bachelor's degree. However, some child care centers employ qualified teachers with a high school diploma and certification or an associate's degree.ublic schools require at least a bachelor's degree; while an associate's degree or high school diploma is acceptable for some child care centers. In many cases, preschool teachers start out as assistant teachers.