Petri Dish Lid

Description (Brief)
This object is a petri dish lid with a circular paper grid featuring the numbers 1–100 taped to it. The paper grid was photocopied out of a laboratory manual, most likely one published by the Cold Spring Harbor Laboratory or Maniatis Laboratory.
The lid was used in the laboratory at Genentech, a biotechnology company, as a way to distinguish between bacterial colonies. It was placed under a clean petri dish, and bacterial colonies were transferred onto the dish, one colony per grid square. Colonies could then be tracked using their grid number. A small sample from each colony could be removed and tested to give the characteristics of the entire colony. This system was essential at Genentech where often scientists needed to keep track of 100s to 1000s of colonies per research project.
Source:
Interview with Dan Yansura, Genentech scientist, 12/20/2012
Location
Currently not on view
Object Name
petri dish lid
user
Genentech, Inc.
Physical Description
plastic (overall material)
paper (overall material)
Measurements
overall: 5/16 in x 3 5/8 in; .79375 cm x 9.2075 cm
used
United States: California, South San Francisco
ID Number
2012.0198.30
accession number
2012.0198
catalog number
2012.0198.30
See more items in
Medicine and Science: Biological Sciences
Science & Mathematics
Biotechnology and Genetics
Data Source
National Museum of American History, Kenneth E. Behring Center

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