sheath

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Related to Leaf sheath: ligules

sheath

1. Biology an enclosing or protective structure, such as a leaf base encasing the stem of a plant
2. the protective covering on an electric cable

sheath

[shēth]
(electricity)
A protective outside covering on a cable.
(electronics)
A space charge formed by ions near an electrode in a gas tube.
(electromagnetism)
The metal wall of a waveguide.
(science and technology)
A protective case or cover.

sheath

In reinforced concrete, an enclosure which encases posttensioned tendons to prevent their being bonded during the placement of concrete.
References in periodicals archive ?
Only the core of the palm tree stem is extracted for trade and food production purposes; leaves and outer and median leaf sheaths are discarded, which generates residue accumulation in the order of 80-90% of the total gross weight.
2 Plan view of a palm leaf with locations of the three distinct types of stem nodal buds and thus branching types; the stem is not drawn but the encircling leaf base is shown, a Axillary branching--the meristem arises in the axil of the leaf; b Abaxial branching-the meristem is located on the base of the leaf sheath, on the abaxial surface of the leaf; and c Leaf-opposed branching-the meristem is borne on the stem of the palm, enclosed by the outer edges of the leaf sheath and opposite to the lamina and petiole
Lower surface of leaf sheath brown-dotted between smaller, pale punctuations; upper leaf surface densely verruculose-papillate throughout; spikelets 23-25 mm long (excluding the sepals); lowest bracteoles 17-18 mm long; anthers ca.
[CL.sup.-] 3.sup.-] (meq/l) (meq/l) 0-33 Silty Clay 2.25 8.44 0.16 2.6 33-66 Silty Clay 2.94 8.28 0.11 4.4 66-99 Silty Clay 2.99 8.28 0.12 8.8 100-150 Silty Clay 3.11 8.17 0.1 9.4 150-200 Silty Clay 3.28 8.21 0.11 8.8 Depth (cm) Texture [Mg.sup.2+] [Ca.sup.2+] OM (meq/l) (meq/l) (%) 0-33 Silty Clay 14.8 14.8 0.63 33-66 Silty Clay 23.7 17.2 0.52 66-99 Silty Clay 22 18.5 0.37 100-150 Silty Clay 17.7 22 0.42 150-200 Silty Clay 18.3 22.5 0.42 Table 3:Percent of leaf sheath moisture of Sugarcane in triple-cropping and double-cropping of Sugarcane.
The highest concentration of Na and Cl in leaf sheaths and stem were found when the maize plants were irrigated throughout the cycle with high salinity water (T5).
pauciflora that we have examined have dense pubescence, particularly on the lower leaf sheaths (some of these had been misidentified as var.
This growing point is surrounded by the lower portions of several leaf sheaths.
* Do you know that bacbac, the dried outer leaf sheath of the abaca stalk (Bacbac is also known as Havana hemp or Havana skin) is used as a raw material for making furniture and craft items like bags, hats, slippers, trays, baskets and other decorative accessories;
h Subapical portion of stem with leaf sheath adhered to the stem (arrowheads), i Detail of leaf sheath showing the suberization process of the external portion, similar to that observed in the stem, with suberized layers (SL)
Itthe fibers from the leaf sheath are made into rope, leaves are woven into household stuffs and seeds made into beads.
(a) Debris deposited by ants around the base of Prosthechea cochleata where orchid mealybugs were concealed; (b) removal of an orchid leaf sheath on a new shoot reveals a large population of mealybugs on P.