Marker

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Related to Markers: DNA markers, Cardiac markers

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 ?
In addition, the company spokesperson said, the Platinum Series of wet erase markers is also perfect for teachers to use in their classrooms, bistro owners to write their menus and business owners to use as window markers to highlight sales.
Cell markers analysis is essential in drug discovery and its use in R&D by pharmaceutical manufacturers and researchers widespread.
A short time later, police were contacted by Starr Scrap Metals that Long was there, trying to scrap the markers and a sewer cover.
To achieve complete automation in process of marker recognition it is proposed to set marker on the end-effector.
Follow-up studies are not necessarily needed for diagnostic markers.
We believe the Singapore markers will serve as valuable reference prices for the industry, while supporting increased price transparency amid the anticipated surge in energy demand from the region in the coming years," said Mike Davis, Director of Market Development, ICE Futures Europe(TM).
Ankle joint centers were estimated in both cases by the average of medial and lateral ankle marker positions, and a knee center was estimated by the average of medial and lateral markers located near the top of the shank piece.
Portable, hand-held equipment is used to find electronic markers by transmitting a radio frequency signal into the ground.
They have Wiccan identifications on their dog tags--and they also should have the right to have the Wiccan Pentacle on the VA-issued grave markers after death.
Surface-mounted cable route markers are made of concrete with a cap made of brass or some other durable metal.
With this similarity in mind, Kobayashi and his staff set out to identify markers that would indicate not only the presence of the cancerous cell, but also its two supporting components.
The technology identifies a cancer marker known as RECAF(tm), which is found on malignant cells from a variety of cancer types but is absent in most normal or benign cells.