Marker

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marker

[′märk·ər]
(immunology)
Any antigen that serves to distinguish cell types.
(ordnance)
A sign or signal for marking a location on land or water; frequently contains pyrotechnics.

Marker

 

a device for guiding a sower or planter to form interrows of a planned width. A marker consists of an extendable bar connected by a hinge to a sower or hitch. On the outer end of the bar is a disk, which is mounted at an angle and rotates freely; as it moves over the field, it leaves a furrow in the un-seeded area. On the next pass of the unit the furrow is used to guide the right front wheel or the inside edge of the right track of a tractor. Sowers and planters usually operate with right and left markers. The overlap (M) of the marker is determined according to the following formulas:

where a is the distance between the front wheels or the inside edges of the tracks, B is the distance between the extreme colters of the sower, and C is the size of the interrow.


Marker

 

an attachment to a single- or double-row sower that ensures parallel rows of seeds in subsequent passes. A marker consists of a beam with a weight on the end; the beam is secured to the front of the tractor. The tractor is steered so that the weight of the marker is above the track left by the planter wheel or marker disk on the preceding pass. Markers are often made reversible so that they can be used on both sides of the tractor.

marker

A sign, plaque, or monument that designates a building, site of historic importance, or boundary.

marker

markerclick for a larger image
Distance to go markers on the sides of runway.
An object displayed above ground level in order to indicate an obstacle or delineate a boundary (ICAO). Markers should be frangible, and those located near a runway or taxiway should be sufficiently low to ensure clearance for propellers and the engine pods of jet aircraft. The various types of markers are the distance-to-go markers, unpaved runway-edge markers, stop-way-edge markers, taxiway-edge markers, taxiway centerline markers, boundary markers, and unpaved taxiway-edge markers.
References in periodicals archive ?
The landmark JUPITER study (The Justification for the Use of Statins in Primary Prevention: An Intervention Trial Evaluating Rosuvastatin) provides an example of how a novel cardiovascular risk marker can function.
Blood pressure is a clear example of a risk marker because it is causally related to CV disease and the reduction in blood pressure induced by an antihypertensive agent is related to the degree of CV risk reduction (2).
Although conventional epidemiologic risk markers provide valuable statements about population risk, especially for the development of coronary heart disease, individual risk prediction still remains the major limitation for applying clinically preventive strategies.
As noted recently in a scientific statement by the American Heart Association (AHA) (7), risk markers should demonstrate independence in multiple prospective cohort studies, must demonstrate incremental information beyond usual risk factors (i.
Until then, hs-CRP is a risk marker that may be useful for some moderately high-risk patients.
Race is most likely a risk marker rather than a risk factor for TB and HIV infection; risk markers may be useful for identifying groups that should be targeted for prevention and education efforts.
More than showing an association of the KRAS-variant with triple-negative breast cancer in premenopausal women, the study clearly shows a novel association of this inherited risk marker and tumor biology," stated Joanne Weidhaas, M.
For a new risk marker to be considered as useful for risk prediction, it must be shown to be a statistically independent predictor after an accounting for established risk factors.
Although the shift in the area under these ROC curves suggests BNP or NTproBNP maybe a valuable risk marker in patients with existing CVD (and perhaps in the lower-risk populations as well), only 2 studies reported measures of calibration or reclassification.
It remains uncertain whether epidural analgesia causes maternal fever or is just a risk marker.
Race is likely a risk marker rather than a risk factor for gonorrhea and other STDs.
Prior research has shown that sensitivity to the stimulating effects of alcohol and other drugs is a risk marker for heavy or problematic use of those substances.

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