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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

marker

A sign, plaque, or monument that designates a building, site of historic importance, or boundary.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Increases in the level of the tumor markers, CA125 and CA19-9, are noted after six years of treatment.
Tumor markers are gaining an important role in all aspects of cancer care, that includes screening and follow-up after treatment1.
As a result, we suggest that all patients should receive both surgery and chemotherapy to achieve normalization of serum tumor marker levels and eliminate viable cells in the residual tumor.
Correlations of Serum Tumor Marker Levels with the Urinary Albumin to Creatinine Ratio and Other Parameters in Diabetic Patients.
(Markers' sensitivity--Mean probability of determining an elevated tumor marker level--over the "cut-off value"--in a tumor-bearing patient)
17, 2014 * NOLF--Navelbine[R], Gxaliplatin, Leucovorin 5-FU ** PID--Paclitaxel, Ifosfamide, Doxil[R] *** PIC--Paclitaxal, Irinotecan, Cisplatin TABLE 2: TREATMENTS OVER 21 MONTHS The chronology over the 21-month period shows how treatment modifications were able to achieve tumor marker reduction.
(1) The tumor markers have to be tailored to the age, complexity of the mass and history.
D'Alessandro R, Roselli M, Ferroni P, Mariotti S, Spila A, Aloe S, et al.Serum tissue polypeptide specific antigen ( TPS): a complementary tumor marker to CA 15-3 in the management of breast cancer.
The aim of this research was to design and to produce a nanocomposite by using carbon nanotubes and ionic liquids in order to be used in the production of sensitive, repeatable, simple, and cost-effective immunosensors for the measurement of tumor markers, especially, PSA tumor marker.
Monitoring patients through tumor marker quantification is also essential in the follow-up of testicular cancer.

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