(n.) The thin and scarious projection from the upper end of the sheath of a leaf of grass.
(n.) A strap-shaped corolla of flowers of Compositae.
(n.) A band of white matter in the wall of fourth ventricle of the brain.
Example Sentences:
(1) Therefore, lg1 mutant sectors not only fail to induce ligule and auricle, but are also disrupting some form of intercellular communication that is necessary for the normally coordinated development of the ligular region.
(2) The ligule and auricles separate the blade and sheath of normal maize leaves and are absent in liguleless-1 (lg1) mutant leaves.
(3) The Kn1-O mutation is characterized by outpocketings of tissue along lateral veins of the maize leaf and by displacement of ligule tissue from the junction of the blade and sheath into the blade.
(4) To establish which inner leaf layer was required for formation of knots and ectopic ligule we used a closely linked albino mutation to mark X-ray-induced clonal sectors of wild type (kn) tissue in Kn1 plants.
(5) Wild-type internal tissue in direct contact with lg1 epidermis appears able to induce the mutant epidermis to form a rudimentary ligule.
(6) The results indicate that the lg1 gene acts tissue specifically in an early step of ligule and auricle initiation.
(7) This establishes a distinct band of cells, from which the ligule arises via periclinal divisions.
(8) We also show that the ectopic ligule in Kn1 has contributions from both the adaxial epidermal and adaxial mesophyll layer.
(9) The anticlinal divisions preceding ligule formation are altered in the mutant; therefore, the gene acts early in development, before the periclinal divisions, and possibly during basipetal vascularization.
(10) During the second stage, ligule and auricle form, blade grows more rapidly than sheath, divisions in the blade become exclusively transverse in orientation, and differentiation begins.
(11) This pattern is particularly apparent in developing adult leaves on older lg1 plants, in which sporadic ligule vestiges form.
(12) Each mutant alters the position of the ligule boundary.
(13) In a normal maize leaf, a ligule and auricles separate the blade and sheath.
(14) 14), we conclude that the information carried by the Lg1+ gene product acts earlier in development than formation of the ligule proper.
(15) Mutants homozygous for the recessive liguleless-1 (lg1) allele exhibit loss of normal ligule and auricle.
(16) The ligule, a fringe normally found at the junction of leaf blade and sheath, is often displaced and perpendicular to its normal position.
(17) In genetically mosaic leaves, when an lg1 mutant sector interrupts the normal ligule, the ligule is often displaced basipetally on the marginal side of the sector.
(18) The maize leaf is composed of a blade and a sheath, which are separated at the ligular region by a ligule and an auricle.
(19) The recessive lg1 mutation prevents formation of ligules and auricles during leaf development.
(20) Second, the dominant mutants all move the ligule boundary in the same direction.
Sheath
Definition:
(n.) A case for the reception of a sword, hunting knife, or other long and slender instrument; a scabbard.
(n.) Any sheathlike covering, organ, or part.
(n.) The base of a leaf when sheathing or investing a stem or branch, as in grasses.
(n.) One of the elytra of an insect.
Example Sentences:
(1) The oral nerve endings of the palate, the buccal mucosa and the periodontal ligament of the cat canine were characterized by the presence of a cellular envelope which is the final form of the Henle sheath.
(2) Electron microscopic observations of the masseter nerve in the aged cats revealed a disruption of the myelin sheaths and a pronounced increase in collagen fibers in the endoneurium and perineurium.
(3) The authors propose three regular procedures with which they are experienced: repair with a large retromuscular nonabsorbable synthetic tulle prosthesis for extensive epigastric eventrations, fillup aponeuroplasty using the sheath of the rectus abdominis associated with a premuscular patch in case of diastasis or of multiple superimposed orifices and suture associated with a small retromuscular auxiliary patch to treat small incisional hernias.
(4) Extraction tools included flexible, telescoping sheaths advanced over the lead to dilate scar tissue and apply countertraction, deflection catheters, and wire basket snares.
(5) Thirteen soft tissue sarcomas with ultrastructural evidence of nerve sheath differentiation were investigated by immunohistochemistry.
(6) This cell population gives rise initially to oligodendrocytes and then to type-2 astrocytes, both of which apparently collaborate in sheathing axons in the CNS.
(7) Rabbit antirat T-cell serum (ALS(T)) reacted selectively with the surfaces of lymphocytes in the paracortex of lymph node and in the periarteriolar sheath of spleen, and with thymocytes.
(8) After properly fixing the vas deferens with a ring clamp, the surgeon pierces the scrotal skin, vas sheath, and vas deferens in the midline with a curved dissecting clamp held at a 45 degree angle from horizontal.
(9) We immunohistochemically examined the expression of Schwann cell-related markers, nerve growth factor (NGF) receptor, S-100 alpha- and beta-proteins, glial fibrillary acidic protein (GFAP), and galactocerebroside (gal C) in 5 malignant schwannomas, 21 benign peripheral nerve sheath tumors, and 4 apparently normal sural nerves.
(10) The transversalis fascia of the floor of the femoral canal turns down to form the medial wall of the venous compartment of the femoral sheath, and has the support of the curved edge of the lacunar ligament which effectively bars the femoral canal from entering the thigh.
(11) Unique domains of the retinal interphotoreceptor matrix (IPM), termed cone matrix sheaths, are composed largely of chondroitin 6-sulfate proteoglycan in most higher mammalian species.
(12) 2ME treatment caused partial solubilization of the sheaths (45% as determined by amino acid analysis), which could be further improved by combining 2ME with SDS.
(13) The 6.8F ultrasound balloon catheter was placed percutaneously in the right femoral artery through a 9F sheath.
(14) The isolated outer sheath was observed as a triple-layered, closed vesicle carrying a polygonal array by electron microscopy.
(15) These data show that the 515 nm absorbance change is not limited to small closed vesicles like grana, but in the presence of suitable electron donors single lamellae of bundle sheath chloroplasts can also be active.
(16) An outer sheath was isolated from Treponema phagedenis biotype Reiter by our previously developed method (Masuda, K., and Kawata, T. 1982.
(17) Seven tumours were predominantly of blue and spindle-cell, fascicular type, resembling malignant peripheral nerve sheath tumour and at times monophasic synovial sarcoma.
(18) Several additional groups of muscle cells of more limited mass and spatial distribution include the vulval muscles of hermaphrodites, the male sex muscles, the anal-intestinal muscles, and the gonadal sheath of the hermaphrodite.
(19) The notochord, which is composed of a stack of flat cells surrounded by a connective tissue sheath, elongates dramatically and begins straightening between stages 21 and 25.
(20) Under fluoroscopic control a lower polar calix was punctured with 18 G sheathed needle; a guide wire was introduced through the sheet.