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Growing bacteria in agar is a great way to teach children about bacteria, disinfectants, and antiseptics. Use the printable for elementary, middle, and high school. Request our special high school insert too.
Grades 3-4: All About Bacteria! What is Biology? What are bacteria? What is synthetic biology? What is iGEM? Growing bacteria cultures. Duration: 2 days -- Day One: 1 hour and Day Two: 0.5 hour Bacteria are all around us, and younger students are often under the impression that bacteria are all “bad”.
To help bacteria multiply quickly, scientists create an environment that has good conditions for bacteria to grow in. Often, scientists grow bacteria in a petri dish on a gel-like material called agar that has bacteria food mixed into it.
Bacteria have optimal temperatures, pH, salinity, oxygenation, and nutrient concentrations for growth. To perform a growth curve, we must take an aliquot (a subsample) of the culture at defined times.
Science Journal List ways that bacteria can be harmful and ways bacteria can be beneficial. Which list is longer? Why do think that is? Bacterial cells have a gelatinlike, protective coating on the outside of their cell walls. In some cases, the coating is thin and is referred to as a slime layer.
In this chapter, we begin with a review of growth under pure cul-ture conditions, and then discuss how this compares to growth in the environment. Typically, to understand and define the growth of a par-ticular microbial isolate, cells are placed in a liquid medium in which the nutrients and environmental condi-tions are controlled.
Mesophiles are bacteria that grow best at moderate temperatures. Their optimum growth temperature is between 25° and 40°C with maximum below 45°C. Most bacteria are mesophilic and include common soil bacteria and PATHOGENS. Thermophiles are heat-loving bacteria.
