Dictionary » P » Piston



(Science: machinery) A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes. Piston head, a slide valve, consisting of a piston, or connected pistons, working in a cylindrical case which is provided with ports that are traversed by the valve.

Origin: F. Piston; cf. It. Pistone piston, also pestone a large pestle; all fr. L. Pinsere, pistum, to pound, to stamp. See Pestle, Pistil.

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An interesting PCR smearing...I dont know what to do :(

... of the "nose" of the pipette. It is best to dismantle the pipette and treat only the pieces that can produce aerosols (the nose and the piston inside), and avoid treating the metal part. A 10 to 15 minute path, followed by distilled water rinsing, and 90% EtOH for quick drying works ...

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by canalon
Tue Jul 19, 2011 8:06 pm
Forum: Molecular Biology
Topic: An interesting PCR smearing...I dont know what to do :(
Replies: 9
Views: 8781

A "breathing machine"?

like any piston? http://en.wikipedia.org/wiki/Piston

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by JackBean
Sun Nov 21, 2010 11:11 am
Forum: Cell Biology
Topic: A "breathing machine"?
Replies: 1
Views: 1007


... determines the free energy of the system. When a system's energy is defined as the sum of its "useful" energy, (e.g. that used to push a piston), and its "useless energy", i.e. that energy which cannot be used for external work, then entropy may be (most concretely) visualized ...

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by dipjyoti
Sun Nov 05, 2006 3:27 pm
Forum: Physiology
Topic: Entropy
Replies: 3
Views: 4313

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