(n.) Any worm belonging to the Plathelminthes; also, sometimes applied to the planarians.
Example Sentences:
(1) New Guinea flatworms measure about 5cm long by 5mm wide.
(2) Rice fields that have abundant mosquito populations lack flatworms.
(3) Platydemus manokwari has a distant cousin, the New Zealand flatworm ( Arthurdendyus triangulatus ), which has triggered an invasive-species scare in western Europe.
(4) Three topics are dealt with in some detail: (1) the behavior of the insect vectors of such diseases as malaria and trypanosomiasis; (2) the intermediate hosts of helminths whose behavior is affected in such a way as to make them more susceptible to predation by the definitive host in the life cycle; and (3) the behavior and fecundity of molluscs infected with asexually reproducing parasitic flatworms.
(5) tetrodotoxin distribution in various tissues of the flatworm Planocera multitentaculata was examined.
(6) It was suggested from these findings that flatworms possess tetrodotoxin as a defense or alarm substance against predators.
(7) On the Mekong, Carlo noted rocks that were the natural habitat of tiny snails acting as intermediate hosts of the flatworm.
(8) The schistosome homeodomain sequences are more similar to the higher animals sequences in their respective classes than they are to each other, indicating that the establishment of these three distinctive classes is at least as ancient as the flatworms.
(9) "It is therefore important to consider the implementation of eradication and control of this flatworm."
(10) Although the flatworms and nemertean worms possess a pseudocoelom, a progressive differentiation of several leukocytic types occurred.
(11) The nature of sugar transport in schistosomes and other flatworms is similar to that in vertebrates.
(12) The warning is being sounded over a voracious species called the New Guinea flatworm.
(13) Carlo's work led to innovative approaches in the control of Schistosoma mekongi, a parasitic flatworm causing intestinal schistosomiasis, transmitted only on the river Mekong.
(14) These antisera give positive IR in more advanced flatworm species, indicating a later convergent evolution of vertebrate-like peptides within the phylum Platyhelminthes.
(15) The manner in which the flatworm, Hymenolepis diminuta (Cestoda), regulates the transport of glucose and Na+ across the brush border was examined.
(16) Intestinal protozoa, roundworms, and flatworms are considered with regard to pathogenic, potential and duration of infection.
(17) In flatworms, sensilla that penetrate the syncytial epidermis bear sensory processes derived from cilia.
(18) In this paper we report the discovery of a population in which such limb abnormalities appear to be caused by a parasitic flatworm (trematode) that uses amphibians as intermediate hosts.
(19) A variety of spontaneously active units was measured in the brain of the polyclad flatworm Freemania litoricola.
(20) A tetrodonic acid-like substance which was hardly distinguishable from authentic tetrodonic acid in thin-layer chromatography, high performance liquid chromatography, etc., was successfully purified from the ribbon worm and flatworm by a method consisting mainly of Bio-Gel P-2 column chromatography.
Planarian
Definition:
(n.) One of the Planarida, or Dendrocoela; any turbellarian worm.
Example Sentences:
(1) In planarians bisected transversely through the pharyngeal region, the decolouration occurs only in the cephalic segment, and the caudal segment remains dark.
(2) Comparison of the experimental results with previous observations on respiration of planarians under similar conditions shows that changes in the level of respiration during starvation and feeding correlate with the content of mitochondrial protein.
(3) We have detected sequence heterogeneity in the cytochrome c oxidase subunit I (COI) gene of freshwater planarian, Dugesia japonica, collected in one locality.
(4) Appropriate preparation of food, control of mollusks and planarians, and elimination of rodents are important measures in limiting the further spread of eosinophilic meningitis caused by A. cantonensis.
(5) The spatial proximity and connectivity of the synapses suggest modes of action permitting greater functional complexity to the planarian brain than previously supposed.
(6) These results are at variance with the generally accepted hypothesis that, in planarians, epidermal cells originate from the parenchyma and the epidermis is not an autonomous tissue.
(7) Many morphological, electrophysiological, and pharmacological features of planarian neurons, as well as synaptic organization, are reminiscent of the vertebrate brain.
(8) It is suggested that planarians lack a direct mechanism for DDT detoxification, since two North American and one European species are known to metabolize DDT initially to DDE and DDD.
(9) Planarians developing from isolated regenerates, when pretreated with epinephrine at different periods of their second regeneration, show a higher rate of sugar uptake than the controls, which were not treated with epinephrine.
(10) In the presence of other planarians, the brain exerts an influence (probably neurohormonal) to suppress fissioning.
(11) Research in the field of planarian regeneration on the one hand, and a general survey of embryology on the other, throw doubt upon the reality of supra-cellular controls, which are still at the basis of all modern concepts of morphogenesis.
(12) Treatment of intact planarians with sublethal concentrations of cadmium sulfate and 12-O-tetradecanoylphorbol-13-acetate (TPA) induced a type of infiltrating tumor that proved to be potentially lethal.
(13) The data obtained are to be taken into account in neurobiological studies on planarians.
(14) Treatment with sublethal concentrations of cadmium sulfate produced a benign, but persistent, tumor in a small percentage of the planarians.
(15) Various surgical cuts were made to ablate selected portions of the central nervous system of isolated and grouped planarians in order to ascertain the inhibitory or facilitatory effects of these in the physiological mediation of such control on the SPF system.
(16) The possibility of gastrointestinal pseudoparasitism by the free-living land planarian, Bipalium kewense, was tested by feeding and survival experiments.
(17) In the central nervous system of some species of several invertebrate phyla, including land planarians (Platyhelminthes), ribbon worms (Nemertina), slugs (Mollusca), polychaetes, earthworms and leeches (Annelida), pill bugs (Arthropoda), and beard worms (Pogonophora), salmon calcitonin-immunoreactive cells and rat calcitonin gene-related peptide (CGRP)-immunoreactive cells were found by immunohistochemistry.
(18) The presence of adenylate-cyclase on the membrane suggests that it might mediate different stimulus-secretion coupling by increasing cyclic AMP synthesis in specialized areas of the planarian.
(19) On the basis of these observations, we hypothesize that SP may be one of the postulated growth factors necessary for the stimulation of proliferation, and to a lesser extent differentiation of cells in intact and regenerating planarians.
(20) The extracts of regenerating planarians contain factors which activate and inhibit cell proliferation in culture.