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n. pl. fo·cus·es or fo·ci (-sī′, -kī′)
a. The distinctness or clarity of an image rendered by an optical system.
b. The state of maximum distinctness or clarity of such an image: in focus; out of focus.
c. An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear: a camera with automatic focus.
a. A point at which rays of light or other radiation converge or from which they appear to diverge, as after refraction or reflection in an optical system: the focus of a lens. Also called focal point.
a. A center of interest or activity: "Precisely how diet affects E. coli in livestock is the focus of current research" (Cindy Engel).
b. Close or narrow attention; concentration: "He was forever taken aback by [New York's] pervasive atmosphere of purposefulness—the tight focus of its drivers, the brisk intensity of its pedestrians" (Anne Tyler).
c. A condition in which something can be clearly apprehended or perceived: couldn't get the problem into focus.
4. Medicine The region of a localized bodily infection or disease.
5. Geology The point of origin of an earthquake.
6. Mathematics A fixed point whose relationship with a directrix determines a conic section.
v. fo·cused, fo·cus·ing, fo·cus·es or fo·cussed or fo·cus·sing or fo·cus·ses
1. To cause (light rays, for example) to converge on or toward a central point; concentrate.
a. To render (an object or image) in clear outline or sharp detail by adjustment of one's vision or an optical device; bring into focus.
b. To adjust (a lens, for example) to produce a clear image.
3. To direct toward a particular point or purpose: focused all their attention on finding a solution to the problem.
1. To converge on or toward a central point of focus; be focused.
2. To adjust one's vision or an optical device so as to render a clear, distinct image.
3. To concentrate attention or energy: a campaign that focused on economic issues.

[New Latin, from Latin, hearth (probably in reference to the fact that a lens or parabolic mirror can concentrate sunlight on a single point to start a fire).]

fo′cus·er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.focusing - the concentration of attention or energy on something; "the focus of activity shifted to molecular biology"; "he had no direction in his life"
engrossment, immersion, absorption, concentration - complete attention; intense mental effort
particularism - a focus on something particular
2.focusing - the act of bringing into focus
intensification - action that makes something stronger or more extreme
refocusing - focusing again
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Capillary electrophoresis is again segmented into micellar electrokinetic capillary chromatography, capillary isoelectric focusing, capillary isotachophoresis and others.
First carried isoelectric focusing on pH 3-10 IPG strip, total protein was loaded onto immobilised pH gradient (IPG) strip and rehydrated for 10-12 h.
Small S-region peaks found by HPLC should be confirmed with isoelectric focusing to determine the presence of Hb [A.sub.2]' (4).
Charge heterogeneity of protein sample with or without carboxypeptidase digestion was assessed by cation exchange chromatography (CEXHPLC) and imaged capillary isoelectric focusing (icIEF).
Cambridge, Canada, February 11, 2016 --( AES (Advanced Electrophoresis Solutions Ltd.), a pioneer in designing and manufacturing the most reliable, high performance, and high throughput CEInfinite whole column imaging detection capillary isoelectric focusing (iCIEF) systems, proprietary cartridges, ampholytes, and pI standards for the life science industry, is pleased to announce Isogen Life Science B.V.
SGS Life Science Services has installed and validated instrumentation which uses frequency modulation spectroscopy (FMS) for headspace oxygen analysis of biopharmaceutical container closure systems, as well as imaged capillary isoelectric focusing (icIEF) for analysis of charge distribution and heterogeneity in biopharmaceuticals, at its facility in Mississauga, Canada.
This text explains various aspects of bioanalytical chemistry and how analytical methods are influenced by the properties of biomolecules, discussing the basics of biomolecules, then instrumental techniques and bioanalytical methods: chromatography; electrophoresis, including isoelectric focusing; mass spectrometry, including matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF) and electrospray ionization mass spectrometry (ESI-MS); molecular recognition in immunoassays, biosensors, DNA-arrays, and pyrosequencing; nucleic acid analysis, including the polymerase chain reaction (PCR); and protein analysis.
First dimensional isoelectric focusing: Immobiline DryStrips (pH 3 to 10 nonlinear (NL), pH 6 to 9, and pH 4 to 7 18 cm; GE Healthcare Bio-Sciences, Sweden) were rehydrated in rehydration buffer (6 M Urea, 2 M thiourea, 4% 3-[{3-Cholamidopropyl} dimethylammonio]-1-propanesulfonate [CHAPS]), 0.4% DTT, 2% v/v immobilized pH gradient (IPG) buffer pH 3 to 10, pH 6 to 11, and pH 4 to 7) overnight.
Isoelectric focusing (IEF) was performed on Ettan IPGphor III horizontal electrophoresis unit (GE Healthcare, NJ, USA) at 20[degrees]C.
The scientists used isoelectric focusing to estimate the inhibitor's isoelectric point: 7.6.
We describe 8 individuals with an unknown Hb variant for which the isoelectric focusing (IEF), citrate agar gel, and HPLC characteristics were suggestive for, but not definitively diagnostic of, Hb Austin.