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 It might be outdated or ideologically biased.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 ?
The methods section defines the primary and secondary outcomes, subgroup analysis, and surrogate markers. It also provides the statistical reference (type of statistical analysis), confidence intervals, outcome comparisons, and power.
Additionally, such variables often vary by pathogen and host; hence, we measured only surrogate markers for exposure because such exposure is a requirement for disease to occur.
The study with the most positive conclusions (a significant benefit for treatment interruption in terms of surrogate marker responses) was GIGHAART, which used the shortest interruption time and the highest number of drugs in the new treatment regimen.
Our metaprobe approaches provide validated surrogate markers to address some of the clinical issues affecting success in trials, including uneven animal model predictability and difficulties in dose and schedule definition.
Most important, Janssen believes, was the study's "identification that the AIDS diagnosis rate for a hospital can serve as a surrogate marker" for HIV-infection rates, which vary widely by region.
at baseline (p<0.001) and during Follow up study (p<0.001) indicating that albumin could be used as a surrogate marker for immunosuppression in HIV/AIDS patients.
As expected, the effects of canagliflozin versus placebo on the surrogate marker of [HbA.sub.1c] was significantly smaller with lower renal function, with reductions of 0.35%, 0.45%, 0.57%, and 0.76% across the four eGFR subgroups, respectively.
Low levels of CD69 under cell division conditions in AD patients is suggestive of lymphocytic cell cycle dysregulation and a surrogate marker for the neuronal cell cycle dysregulation which has been observed in the brains of AD patients at autopsy.
Cardiovascular phenotyping between the ages of 60 and 64 years with carotid intima media thickness (cIMT; a surrogate marker for cardiovascular events) was used to assess the effect of lifetime exposure to adiposity on cardiovascular risk factors.
The product is in a Phase IIb registrational trial under a Special Protocol Assessment with the US Food and Drug Administration, utilising a surrogate marker registrational endpoint.
In this study, we aimed to develop a SYBR green-based real time PCR (qPCR) to detect the bIaOXA-23 gene directly from respiratory tract specimens in patients under mechanical ventilation, potentially serving as a surrogate marker for the presence of CRAB in those patients.
The objective of this pilot study was to evaluate the chemopreventive effect of metformin on rectal aberrant crypt foci (ACF), which are an endoscopic surrogate marker of colorectal cancer.