CELLS alive!


This time-lapse sequence shows the growth of Streptococcus pneumoniae over a six-hour period. The resulting sequence begins four times daily (your local time) at midnight, 6 AM, noon, and 6 PM. A fresh image is loaded every minute.


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The length of time between cell divisions is dependent on a number of factors including nutrient concentration, waste concentration, temperature, concentration of gases and more. Can you tell how long it takes for this population of bacteria to double?

Clicking on the decrement and increment buttons above allows you to view any previous frame in the sequence.