Screening
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Look up screening in Wiktionary, the free dictionary. |
One meaning of screening is the investigation of a great number of something (for instance, people) looking for those with a particular problem or feature.
For example at an airport many bags are screened by x-ray to try to detect any which may contain weapons or explosives, and people are screened by passing through a metal detector.
The investigation of a large population is related; the members of a population are filtered by a metaphorical, rather than physical, screen. If only part of a population is screened, screening is equivalent to sampling in statistics.
Important cases of screening include:
- in biology and medicine
- Screening (microbiology), a technique used to selectively isolate the target microbial species from a vast community of microbes.
- Screening (medicine)
- Fetal screening
- Newborn screening
- Genetic screen
- Two-hybrid screening
- High-throughput screening
- High-content screening
- Virtual screening
- in security
- Screening (economics)
- Mechanical screening
- Screening of articles; selection of articles for a systematic review
- Screening (tactical), a technique in which one military unit provides cover for another in terms of both physical presence and firepower.
Screening can also mean preventing access of something by some sort of barrier. Particular cases:
- Electric field screening
- Electromagnetic shielding in physics, the exclusion of electric, magnetic, or electromagnetic fields by a metallic screen or shield
- In atomic physics and chemistry, the screening effect or atomic shielding is the reduction of effective nuclear charge by intervening electron shells
- Screening (printing), a process that represents lighter shades as tiny dots, rather than solid areas, of ink by passing ink through a perforated screen
- Screening is a process stage when cleaning paper pulp
Other uses:
- Film screening, showing a film by projection onto a screen
- Test screening
- Private screening
[edit] See also
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