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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.
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
References in periodicals archive ?
ApoE phenotyping was performed on 10 [micro]L of serum from the three patients with the newly identified mutations by isoelectric focusing (IEF) followed by Western blotting using monoclonal antibodies specific for apoE (Dako) (16).
After executing isoelectric focusing (IEF) using pH 3 to 10 NL, pH 6 to 9 and pH 4 to 7 IPG strip gels by mixing three samples labeled with fluorescence CyDye DIGE flour, they were separated in 8% to 16% polyacrylamide gradient gel for SDS-PAGE.
Also, techniques such as isoelectric focusing are very technique-dependant.
3) Similarly, the sample OLI-01 from the M-A 2011 survey was analyzed by isoelectric focusing as shown in Figure 2, A.
IRKP cells were subjected to isoelectric focusing (at a pH ranging from 4 to 7) and 2-DE to determine the ability of EGCg to either induce or suppress protein expression.
For getting an idea about separation accuracy during different purification processes all fractions were tested with inhibitor activity by IEF technique which could be use also as a detection method according to isoelectric focusing point.
This hemoglobin variant was detected by isoelectric focusing moving just ahead of Hb A.
3) A Task Force report from the European Federation of Neurological Science (EFNS) recently described Class I evidence to support the use of isoelectric focusing for both predictive and diagnostic testing in the diagnosis of MS.
Coverage includes common microfabrication techniques utilized to create microfluidic devices and on-chip flow control and mixing microsystems, on-chip electrophoresis and isoelectric focusing methods for quantitative biology, electrical methods for manipulations of droplets via electrowetting and particles via dielectrophoresis for separations and chemical reactions, methods for integrated optical characterization of microfluidic devices and for controlling chemical gradients within devices, microimmunoassay diagnostics, MicroFACS system, and microtubule motors in microfluidics.
Capillary isoelectric focusing (clEF) is another accurate method where the sensitivity of detection of capillary electrophoresis is combined with the automated sampling and data acquisition of HPLC (5,6).