layer

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layer

1. one of four or more levels of vegetation defined in ecological studies: the ground or moss layer, the field or herb layer, the shrub layer, and one or more tree layers
2. a laying hen
3. Horticulture
a. a shoot or branch rooted during layering
b. a plant produced as a result of layering

layer

[′lā·ər]
(computer science)
One of the divisions within which components or functions are isolated in a computer system with layered architecture or a communications system with layered protocols.
(geology)
A tabular body of rock, ice, sediment, or soil lying parallel to the supporting surface and distinctly limited above and below.
(geophysics)
One of several strata of ionized air, some of which exist only during the daytime, occurring at altitudes between 30 and 250 miles (50 and 400 kilometers); the layers reflect radio waves at certain frequencies and partially absorb others.
(metallurgy)
The stratum of weld metal consisting of one or more passes and lying parallel to the welding surface.

course

course, 1
1. A layer of masonry units running horizontally in a wall or, much less commonly, curved over an arch; it is bonded with mortar.
2. A continuous row or layer of material, as shingles, tiles, etc.

layer

layer

(1) One of several "drawing boards" or "canvasses" for creating elements in a picture. See layers and flatten layers.

(2) One of several levels in a communications protocol. See OSI model.
References in periodicals archive ?
Transverse sections of Thomomys, Cratogeomys, and Geomys incisors reveal varying thickness of the inner uniserial versus the outer radial enamel layers between genera, which may reflect differing fossorial lifestyles.
Dietschi suggested the selection of a composite material to replicate dentin that should have a single hue, a single opacity but a large chroma (beyond the usual four Chroma levels of the VITA system).34,37 He described three different types of enamel as young, adult and old.38 This characterization is based on the changes in value L* and the contrast ratio in relation to the age of the tooth, with the enamel becoming yellower, less opalescent and more translucent with the advancing age.34,37-40 The technique involves the placement of lingual enamel layer, followed by the use of a high chromatic shade to build up the dentin and a last layer of translucent enamel to complete the restoration (Fig 4).41-42
The enamel layer is preserved better and the thickness of the ceramic veneer is standardised.
Criteria for caries assessment of histological tooth sections Score Criteria 0 No demineralisation 1 Enamel demineralisation limited to the outer half (50%) of the enamel layer 2 Enamel demineralisation extending into the inner half of the enamel layer and dentino-enamel junction 3 Dentine demineralisation in its initial layer 4 Frank dentine demineralisation Table 2.
According to Seow [7] pulp stones are formed as the result of the external local irritation because of the thin enamel layer and attrition.
Advantages of the presented technique include a greater stability of color because the final enamel layer consists of a conventional resin that modifies the dental value (ENA HRi, Micerium S.P.A., Avegno, GE, Italy) and a high refractive index, identical to natural enamel (IR = 1.62) [33, 34], These characteristics optimize appearance, leading to a more esthetic restoration, as well as decreasing the clinical restorative time.
These increases were significantly greater than those achieved by conventional topical fluoride and suggest that, related to the surface enamel layer, diode laser increases fluoride uptake when irradiated through topical fluoride application.
The enamel layer hardens as the crystallites grow in width and thickness resulting in a mineralised tissue that contains more than 95% mineral by weight.
These found patterns are defamiliarized into dense, computerized combinations that are rendered in multiple handpainted enamel layers. Her audacious palette of intense yellows, oranges, reds, magentas, blues, and greens is not merely physically bracing; it also nods to biochemistry's use of fluorescent dyes to track the motion of cells and molecules in the body.
In the past, scientists had to cut open teeth to count enamel layers and rings.