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HOOK EFFECT [3 records]

Record 1 2009-10-14

English

Subject field(s)
  • Bioengineering
CONT

High dose hook effect is a phenomenon associated with an immunometric assay, in which extremely high concentrations of a substance give an artifactually lower value when measured by the one-step immunoassay.

Key term(s)
  • high dose hook effect

French

Domaine(s)
  • Technique biologique
DEF

Effet de saturation du système d'immuno-analyse en présence d'excès d'antigène.

Spanish

Save record 1

Record 2 2004-06-10

English

Subject field(s)
  • Anthropology
DEF

The Aztec word for a spear throwing stick device.

OBS

This projectile propulsion device preceded the bow and arrow. In general, a wooden or bone stick or board with a hand grip at one end and a spur or hook at the other end. The atlatl is used as an extension of the arm in throwing a spear or dart. The spear shaft is socketed and fits into the spur or hook of the Atlatl. Essentially the Atlatl lengthens the length of the spear thrower's arm and with loaded, spring-like, motion can provide the benefit of greater force and distance over that of the hand thrown spear. It is hypothesized that sometimes a stone weight(s)(a. k. a. : Bannerstone, Birdstone, Boatstone) was attached to the Atlatl to provide better balance or to load the device with a spring or bending effect or to diminish the "whoosh" noise created during the throwing process.

French

Domaine(s)
  • Anthropologie
CONT

L'atlatl a servi pendant très longtemps à lancer les javelots des chasseurs ou des guerriers. Encore maintenant, ce propulseur mécanique reste utilisé par les chasseurs de l'Alaska et d'Australie. Les hommes installent une extrémité de leur lance dans la planche juste avant de l'envoyer, pour multiplier leur force et donc la vitesse de la lance dans l'air. Grâce à l'atlatl, les lances atteignent des vitesses de 100 km/h sur une distance de 200 mètres.

Spanish

Save record 2

Record 3 1998-07-08

English

Subject field(s)
  • Lithography, Offset Printing and Collotype
DEF

The angle subtended by the paper in contact with the blanket.

CONT

When effective tack is too high, excessive blanket wrap can result, that is the paper adheres to and follows the blanket cylinder surface to a greater extent before releasing than would be expected with lower ink tacks or normal conditions. The effect is usually more prominent in solid printing areas. Momentary increase in tension is experienced in these areas causing localized stretch, resulting in problems with running, side-to-side register, cut-off register, waffling and tail-end hook.

OBS

Not to be confused with blanket wraparound. See this record in TERMIUM.

French

Domaine(s)
  • Lithographie, offset et phototypie
CONT

L'enroulement est exprimé par l'angle formé entre la feuille quittant la surface du blanchet et la tangente au point de contact. Dans les conditions normales d'impression, l'adhérence de la feuille sur le blanchet est proportionnelle au tirant de l'encre.

Spanish

Save record 3

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