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Micropipette in action. Piston-driven air displacement pipettes are a type of micropipette, which are tools to handle volumes of liquid in the microliter scale.They are more commonly used in biology and biochemistry, and less commonly in chemistry; the equipment is susceptible to damage from many organic solvents.
Positive displacement pipettes are a type of pipette that operates via piston-driven displacement. [1] [2] Unlike an air displacement pipette, which dispenses liquid using an air cushion in the pipette tip, the piston in a positive displacement pipette makes direct contact with the sample, allowing the aspiration force to remain constant.
As the piston moves upward, driven by the depression of the plunger, a vacuum is created in the space left vacant by the piston. The liquid around the tip moves into this vacuum (along with the air in the tip) and can then be transported and released as necessary. These pipettes are capable of being very precise and accurate.
When the pipette knob is pressed on an air displacement pipette, the piston inside the instrument moves down to let air out. Air is displaced by the piston. The volume of air displaced is equivalent to the volume of liquid aspirated. These pipettes are capable of being very precise and accurate.
The company Eppendorf improved the first "Marburg pipette" apparatus in cooperation with Heinrich Schnitger, and took over the exclusive license of the patent for commercialization. Heinrich Schnitger died in 1964, before the global spread of his invention, due to an accident while swimming in a mountain lake in Upper Bavaria.
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as a scientist who uses pipettes on an hourly basis, and as someone who has worked for companies that make them, just a quick scan turns up some errors, eg "Piston-driven air displacement pipettes Single-Channel Pipettes designed to handle 1-5ml and 100-1000µl with locking system Main article: Air displacement pipette These pipettes are the ...
There are two main types of burette; the volumetric burette and the piston burette. A volumetric burette delivers measured volumes of liquid. Piston burettes are similar to syringes, but with a precision bore and a plunger. Piston burettes may be manually operated or may be motorized. [2] A weight burette delivers measured weights of a liquid. [3]