Random positioning machine
- Random positioning machine
Infobox Laboratory equipment
name = random positioning machine
caption =
acronym =
other_names = 3D clinostat
uses = rotates biological samples around two independent axes to elimante the effect of gravity
inventor = T. Hoson
manufacturer = Dutch Space
model =
related = clinostat, free fall machine
A random positioning machine, or RPM, rotates biological samples along two independent axes to change their orientation in space in complex ways and so eliminate the effect of gravity [Jack J.W.A. van Loon (2007). Some history and use of the random positioning machine, RPM, in gravity related research. Advances in Space Research 39: 1161-1165] .
Description
The RPM is a more sophisticated development of the single axis clinostat. RPMs usually consist of two independently rotating frames. One frame is positioned inside the other giving a very complex net change of orientation to a biological sample mounted in the middle. So the RPM by some wrongly referred to as the 3-D clinostat, is a microweight ('microgravity') simulator that is based on the principle of 'gravity-vector-averaging'. RPM provides a functional volume which is 'exposed' to simulated microweight.
ee also
* gravitropism
* clinostat
References
External links
* ETH Space Biology [http://www.spacebiol.ethz.ch/research/equipment/simulation/equip_1/ "Random Positioning Machine"]
* DESC VU Amserdam [http://www.descsite.nl/RPM_Frames.htm "Standard and desktop Random Positioning Machines"]
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