ultrafilter

ultrafilter
I. \\|əltrə+\ noun
Etymology: International Scientific Vocabulary ultra- + filter
: a dense filter used for the filtration of a colloidal solution that holds back the dispersed particles but not the liquid
II. transitive verb
: to cause to pass through an ultrafilter

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ultrafiltration /ul'treuh fil tray"sheuhn/, n.
/ul'treuh fil"teuhr/, n.
1. Physical Chem. a filter for purifying sols, having a membrane with pores sufficiently small to prevent the passage of the suspended particles.
2. Math. a filter in a topological space, having the property that no other filter exists in the space having among its subsets all the subsets in the given filter.
v.t.
3. Physical Chem. to purify by means of an ultrafilter.
[ULTRA- + FILTER]

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ultrafilter /ulˈtrə-fil-tər/ (biology and chem)
noun
An extremely fine filter which retains particles as fine as large molecules
transitive verb
To pass through an ultrafilter
ORIGIN:ultra- (2)
• • •
ultrafīlˈtrate noun
A substance that has passed through an ultrafilter
ultrafīltrāˈtion noun
The separation of particles by filtration, under suction or pressure

Useful english dictionary. 2012.

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Look at other dictionaries:

  • Ultrafilter — In the mathematical field of set theory, an ultrafilter on a set X is a collection of subsets of X that is a filter, that cannot be enlarged (as a filter). An ultrafilter may be considered as a finitely additive measure. Then every subset of X is …   Wikipedia

  • Ultrafilter — Ein Ultrafilter ist in der Mathematik ein Mengenfilter auf einer Menge X, so dass für jede Teilmenge A von X entweder A selbst oder ihr Komplement X − A (Differenzmenge) Element des Mengenfilters ist. Ultrafilter sind somit genau diejenigen… …   Deutsch Wikipedia

  • Ultrafilter — ypač tankus filtras statusas T sritis radioelektronika atitikmenys: angl. ultrafilter vok. Ultrafilter, n rus. фильтр сверхтонкой очистки, m pranc. ultrafiltre, m …   Radioelektronikos terminų žodynas

  • ultrafilter — ypač tankus filtras statusas T sritis radioelektronika atitikmenys: angl. ultrafilter vok. Ultrafilter, n rus. фильтр сверхтонкой очистки, m pranc. ultrafiltre, m …   Radioelektronikos terminų žodynas

  • Ultrafilter — ultrafiltras statusas T sritis Standartizacija ir metrologija apibrėžtis Įtaisas didesnėms kaip 0,1 μm dalelėms filtruoti. atitikmenys: angl. ultrafilter vok. Ultrafilter, n rus. ультрафильтр, m pranc. ultrafiltre, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • ultrafilter — ultrafiltras statusas T sritis Standartizacija ir metrologija apibrėžtis Įtaisas didesnėms kaip 0,1 μm dalelėms filtruoti. atitikmenys: angl. ultrafilter vok. Ultrafilter, n rus. ультрафильтр, m pranc. ultrafiltre, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • ultrafilter — ultrafiltration /ul treuh fil tray sheuhn/, n. /ul treuh fil teuhr/, n. 1. Physical Chem. a filter for purifying sols, having a membrane with pores sufficiently small to prevent the passage of the suspended particles. 2. Math. a filter in a… …   Universalium

  • ultrafilter — ul•tra•fil•ter [[t]ˌʌl trəˈfɪl tər[/t]] n. 1) chem. a filter for purifying sols, having a membrane with pores sufficiently small to prevent the passage of the suspended particles 2) chem. to purify by means of an ultrafilter • Etymology: 1905–10… …   From formal English to slang

  • ultrafilter — /ʌltrəˈfɪltə/ (say ultruh filtuh) noun 1. a filter for the separation of solute molecules of different sizes, using a semipermeable membrane filter through which the solute cannot pass. –verb (t) 2. to separate in an ultrafilter …  

  • últrafílter — tra m (ȗ í) teh. naprava za filtracijo, navadno pod zvišanim tlakom, ki se uporablja za ločevanje koloidnih delcev in makromolekulskih snovi od tekočine: ultracentrifuga in ultrafilter …   Slovar slovenskega knjižnega jezika

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