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A pipette (sometimes spelled as pipet) is a type of laboratory tool commonly used in chemistry and biology to transport a measured volume of liquid, often as a media dispenser. Pipettes come in several designs for various purposes with differing levels of accuracy and precision , from single piece glass pipettes to more complex adjustable or ...
Plastic Pasteur pipettes. An eye dropper, also called Pasteur pipette or simply dropper, is a device used to transfer small quantities of liquids. [1] They are used in the laboratory and also to dispense small amounts of liquid medicines. A very common use is to dispense eye drops into the eye.
A Mohr pipette is designed for use as a drain-out pipette. It has a straight tube and graduation marks indicating 0.10 millilitres (0.0035 imp fl oz; 0.0034 US fl oz) changes volume. This type of pipette does not have its first (lowest) graduation mark until well past the base of the tip.
(These are for Class A pipettes; Class B pipettes are given a tolerance of twice that for the corresponding Class A.) A specialized example of a volumetric pipette is the microfluid pipette (capable of dispensing as little as 10 μL) designed with a circulating liquid tip that generates a self-confining volume in front of its outlet channels. [3]
A Mohr pipette, also known as a graduated pipette, is a type of pipette used to measure the volume of the liquid dispensed, although not as accurately as a volumetric pipette. [1] These use a series of marked lines (as on a graduated cylinder) to indicate the different volumes. [2] They come in a variety of sizes, and are used much like a ...
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.
One employee at the Food and Drug Administration recently tried to put in an order for pipette tips, a basic lab item, Wired reported. However, that order was put on hold. However, that order was ...
[2] [3] They thus are used for smaller-scale transfers than equipment such as graduated pipettes, which come in 5, 10, 25 and 50 mL volumes. The most common type of pipettes can be set to a certain volume within its operational range and are called adjustable. These pipettes commonly have a label with their volume range like "10–100 μL".
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