annulus

(redirected from annuli)
Also found in: Dictionary, Thesaurus, Medical.

annulus

[′an·yə·ləs]
(anatomy)
Any ringlike anatomical part.
(botany)
An elastic ring of cells between the operculum and the mouth of the capsule in mosses.
A line of cells, partly or entirely surrounding the sporangium in ferns, which constricts, thus causing rupture of the sporangium to release spores.
A whorl resembling a calyx at the base of the strobilus in certain horsetails.
(mathematics)
The ringlike figure that lies between two concentric circles.
(mycology)
A ring of tissue representing the remnant of the veil around the stipe of some agarics.
References in periodicals archive ?
Govil, "On comparison of annuli containing all the zeros of a polynomial," Applicable Analysis and Discrete Mathematics, vol.
After sending the lower front tooth to Wildlife Analytical Laboratory, the cementum annuli reading was 4 1/4 years old.
Validation of annuli counts was completed through marginal-increment analysis, which provided indirect evidence at the otolith margin of the periodicity of annulus formation.
At the same time, the increased IDP and the maximum von Mises stresses in the annuli in this model indicated a greater load through the intervertebral disc of L4-L5.
Ketchen (1975) developed an algorithm to estimate the number of missing annuli in the worn portion of the fin spine using the relationship between the enamel base diameter and the number of annuli counted on unworn worn fin spines.
Past studies have reported that Atlantic surfclams Spisula solidissima form one annulus per year in the fall, and thus annuli can be counted to determine the year class of the surfclam and final age can be assigned precisely relative to when the last annulus was formed (Almeida & Sheehan 1997).
Because L annuli are considered, the energy accumulated in the battery of the harvester node [N.sub.H] due to the transmitters located in the L annuli is given by
The number of annuli in females and males ranged between 34-36 and 39-45 respectively (Table 1), bodysize was estimated in 67.54 [+ or -] 6.63mm for females (N=6) and 20.39 [+ or -] 2.38mm for males (N=13).
This material is inert and can be used without any reservation in the annuli of the PIP segments.
Key words: cementum annuli, Cougar, gum-line recession, mammal aging, Mountain Lion, Oregon, Puma concolor
After response sequences were obtained from a preparation, the isolated head was left in place in the recording chamber, and the margins of the three stimulating zones within the aesthetasc array along the antennular flagellum were carefully measured, in terms of the identity of included flagellar annuli, using a dissecting microscope.