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 ?
However, a recent international consensus panel (39) on prognostic markers for bladder cancer concluded that, although certain markers, such as p53, appear promising in predicting the progression of bladder cancer, the data were still heterogeneous.
13] Currently, pre-treatment PSA, Gleason score, stage and SM status are accepted and used prognostic markers.
Expression of E-cadherin and [alpha]-, [beta]-, [gamma]-catenins in patients with bladder cancer: identification of gamma-catenin as a new prognostic marker of neoplastic progression in T1 superficial urothelial tumors.
An ideal prognostic marker would identify patients at a stage where preventive or therapeutic measures might influence the course of the disease.
For example, in diffuse large B-cell lymphoma, one of the most common lymphoma subtypes, immunohistochemical surrogate prognostic marker studies are refined and used in combination with the clinical international prognostic indices to help predict how patients will respond to chemotherapy.
Thus, the concentrations of the individual cleaved uPAR forms could be indicators of the activity of the plasminogen activation system, and the cleavage products may be stronger prognostic markers than the total amount of the uPAR forms.
We should think of it in terms of being a major prognostic marker.
More studies need to be done, but this could provide an important prognostic marker to determine which patients need to be treated more aggressively or watched more closely.
Now that we see palladin is expressed mostly in invasive cells, it raises the question as to whether it might be useful as a prognostic marker.
FLT3 is a commonly mutated gene found in acute myeloid leukemia (AML) patients and its activating mutations have been proven to be a negative prognostic marker for clinical outcome suggesting a possible future role for treatment of AML.
Methylation of serum DNA is an independent prognostic marker in colorectal cancer.