(1) Thus, a plant alpha-tubulin exhibits a high degree of homology to the alpha-tubulins of protists and animals.
(2) Molecular distances were computed between the aligned nucleotides of all presently available protist sequences and were used to derive a tentative dendrogram.
(3) The microsporidia are a group of unusual, obligately parasitic protists that infect a great variety of other eukaryotes, including vertebrates, arthropods, molluscs, annelids, nematodes, cnidaria and even various ciliates, myxosporidia and gregarines.
(4) Actin genic regions were isolated and characterized from the heterokont-flagellated protists, Achlya bisexualis (Oomycota) and Costaria costata (Chromophyta).
(5) An RNA polymerase III in vitro transcription system has been developed from the protist Acanthamoeba castellanii.
(6) Unlike the actin-encoding genes (act) of other filamentous fungi, no introns are obvious in the coding region, a feature shared with the act genes of certain protists.
(7) We have undertaken the construction of a broad molecular phylogeny of protists through the comparison of 28S rRNA molecules.
(8) Parasitic amitochondriate protists, representatives of early branches of eukaryote evolution, differ considerably in their central, energy metabolism from mitochondrion-bearing cells.
(9) The emonctory structures, functions and stereotype and their component parts are studied in protists, spongia, coelenterata and coelomata: lower worms, annelids, their hyponeurian descendents (arthropods, molluses) and epineurian descedents echinoderms and protochordates (Stomochordata, Tunicata, Cephalochordata).
(10) The most probable hypothesis is that of a symbiotic origin of the first zygote by association of two protists one signifying a spherical oocell and the other a flagellated spermatozoan; this could be the first step of the metazoan ontogenesis and therefore also of the phylogenesis.
(11) The folding for the D3, D7a and D10 divergent domains has been refined and a consensus model for the protist 24-26S rRNA structure is proposed.
(12) The classification thus seeks to offer a compromise between the protist and protoctist kingdoms of Whittaker and Margulis and to combine a full listing of phyla with grouping of these for synoptic treatment.
(13) The E. gracilis divergence far antedates a period of massive evolutionary radiation that gave rise to the plants, animals, fungi, and certain groups of protists such as ciliates and the acanthamoebae.
(14) It is suggested that, in line with comparable situations in other protists, expansion of the nuclear envelope is chiefly responsible for separation of the nucleus into two daughter nuclei.
(15) This simple binary immunological character was superimposed on a number of published protist phylogenies and seen to fit very well with some of them.
(16) The data show that the cytochrome c oxidase of the protist Euglena is different from other eukaryotic cytochrome c oxidases in number and size of subunits, and also with regard to kinetic properties and substrate specificity.
(17) The ciliated protists (ciliates) offer a unique opportunity to explore the relationship between chemoreception and cell structure.
(18) Glucokinase activities that phosphorylate glucose and glucosamine are inhibited by N-acetyl-glucosamine and xylose, were found to be present in the non-sulphur photosynthetic bacteria Rhodospirillum rubrum, the blue-green algae Anacystis montana, and the protists Chlorella pyrenoidosa and Chlamydomonas reinhardtii (green algae), Hypochytrium catenoides (Hypochytridiomycete) and Saprolegnia Iitoralis (Oomycete).
(19) This interpretation of the identity of nucleus-associated membranes differs from those previously reported for other protists, including members of the Plasmodiophorales.
(20) The reduction of flagella (cilia) is occurring in different taxa independent of the transition of protists from the flagellate type of locomotion to the amoeboid, gliding of metabolizing ones, and in the number of metazoan cells.
Velum
Definition:
(n.) Curtain or covering; -- applied to various membranous partitions, especially to the soft palate. See under Palate.
(n.) See Veil, n., 3 (b).
(n.) A thin membrane surrounding the sporocarps of quillworts Isoetes).
(n.) A veil-like organ or part.
(n.) The circular membrane that partially incloses the space beneath the umbrella of hydroid medusae.
(n.) A delicate funnel-like membrane around the flagellum of certain Infusoria. See Illust. a of Protozoa.
Example Sentences:
(1) MRI revealed cranium bifida and agenesis of anterior medullar velum.
(2) To compare biochemical differences between bivalves with and without endosymbiotic chemoautotrophic bacteria, specimens of Solemya velum, a bivalve species known to contain bacterial endosymbionts, and the symbiont-free soft-shelled clam Mya arenaria, were collected from the same subtidal reducing sediments during October and November 1988.
(3) The Z-plasties facilitate effective dissection and redirection of the palatal muscles to produce an overlapping muscle sling and lengthen the velum without using tissue from the hard palate, which permits hard palate closure without pushback or lateral relaxing incisions.
(4) We now report that, compared to controls, rats with acute EAE exhibit fewer detectable mast cells in their dura mater and velum interpositum.
(5) The superior medullary velum was not recognized in 10 cases and the corpus medullare in 5.
(6) Its efficacy is generally accepted, and its use, especially in cases of obstructive sleep apnea syndrome, is the only treatment of the palatal velum at present practiced.
(7) The axons originate in dorsal dendrites, run dorsally along the border of the gray matter and pierce the velum medullare on the contralateral side.
(8) While coughing the movement of the velum is purely passive because of the exspirational thrust.
(9) The velopharyngeal closure patterns can be grouped into five categories according to the manner of the velum and lateral pharyngeal wall movements.
(10) Few 5-HT nerve terminals occurred only on the roof of the fourth ventricle (velum medullare, lamina epithelialis of the tela chorioidea), and the surface of the choroid plexus epithelia was devoid of such nerves.
(11) The inferior medullary velum and tela choroidea were removed intact from the fourth ventricle, post-osmicated, dehydrated, critical point dried, coated with palladium-gold and examined in a Cambridge Stereoscan S4 scanning electron microscope.
(12) The clinical presentation, radiological findings, and surgical management of two cases of meningioma arising from the velum interpositum without dural attachment are described.
(13) The delta 13C and delta 15N ratios of the amino acids are very similar to the isotope ratios previously found in both the endosymbionts and whole tissues of S. velum.
(14) Five patients evaluated via multi-view videofluoroscopy were found to have incongruous movements between the velum and lateral aspects of the pharyngeal walls.
(15) They are lined on the inside towards the distal part of the velum by thin epithelium and towards the proximal part by ciliated sensory cells.
(16) The cerebellum, the beginning of which was already noted at stages 13 and 14, consists of (1) a rostral part that arises from the alar plate of the isthmic segment and will form the superior medullary velum and part of the corpus cerebelli; and (2) a caudal part that develops from rhombomere 1.
(17) The measuring principle is described and the movements of the velum during speech production are demonstrated in cleft palate patients with different speech results.
(18) In individuals without pharyngeal flap surgery the velum was displaced in the anterior direction and its position could be influenced by the pushback of the mandible.
(19) In addition to this permanement neurogenous myoclonus, there are also rhythmical contractions of the velum, usually considered to be psychogenous.
(20) The second procedure is for use after exeresis involving all or almost all of the soft palate and a half of the posterior pharyngeal wall, and makes use of velum palatinum reconstruction.