annulus

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annulus

 [an´u-lus] (pl. an´nuli) (L.)
alternate spelling of anulus.

annulus

(ăn′yə-ləs)
n. pl. annu·luses or annu·li (-lī′)
1. A ringlike figure, part, structure, or marking, such as a growth ring on the scale of a fish.
2.
a. A ring or group of thick-walled cells around the sporangia of many ferns that functions in spore release.
b. The ringlike remains of a broken partial veil, found around the stipes of certain mushrooms.

annulus

Any ring-like structure (e.g., mitral valve annulus).

annulus

Any ring-like structure.

annulus

  1. the ring of cells in the moss or fern capsule which splits to allow the liberation of spores.
  2. a ring of tissue surrounding the stalk in the fruiting bodies of the BASIDIOMYCOTA fungi.
References in periodicals archive ?
If you would like to have your deer or other game species accurately aged using the cementum annuli method, contact the Wildlife Analytical Laboratory at (512) 756-1989, or visit them online at deerage.com.
Although scales have been used to age sheepshead (Music and Pafford (2); Schwartz, 1990; and Wenner (3)), validation of annuli on scales of sheepshead has indicated that scales are not as reliable as otoliths for aging this species.
Besides spinal instability, greater IDP of L4-L5 intervertebral disc and stress in the annuli will result in rupture of the annulus fibrosus.
and process errors associated with estimating th e number of worn annuli all combine to produce the low precision in age estimates and therefore growth parameters (Tribuzio et al., 2010).
If the smoothed edge analysis and marginal increment data plotted by day of year formed sinusoidal cycles with a frequency of 1 y (a qualitative, not model-based result), the assumption of true annuli was considered validated and the timing of annulus formation was estimated.
When the aggregate power from the L annuli is considered the CF is written as follows:
In particular, an analysis of cementum annuli may be used to estimate age, or to develop population estimates through mark-recapture using a biomarker such as tetracycline (Matson and Kerr 1998).
clarkii, in Figure 3B-D, showing sample annuli from (B) the region near the origin of the aesthetasc array, (C) a region close to the center of the array, and (D) a region just proximal to the tip of the flagellum, the distal termination of the array.
Results: Cadaveric discs, group A, B and C compared with herniated discs A1, B1 and C1, Annuli fib- rosi in herniated discs (A1, B1, and C1) showed significant reduction of cells, disorganized lamellar pattern of collagen, formation of cysts, clefts and numerous new micro-vessels as compared to fresh cadaveric disc tissues (A, B and C).
Methods typically involve enumeration of zones or rings (annuli) formed by annual disruptions or changes in growth of the hardpart.
n-harmonic mappings between annuli; the art of integrating free Lagrangians.