IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Erlenmeyer flask with two side tubes ...

If we fill up an Erlenmeyer flask, the liquid surface gets smaller the more liquid is underneath. This inverse correlation severely impedes oxygen transfer if the flask is filled too high.

Now, professor Richard Lenski and colleagues document the process in their analysis of 40,000 generations of bacteria grown in Erlenmeyer flasks, published this week in science journal Nature.

To produce and isolate pyranonigrin E, 1 ml of the A. niger NBRC5374 spore solution (1 × 10 6 spores per ml) was dropped on the potato dextrose agar agar (100 ml) in an Erlenmeyer flask and ...