(1) Phyla as diverse as insects, birds, and mammals possess distinct HRAS and KRAS sequences, suggesting that these genes are essential to metazoa.
(2) The ruthenium red method was also used on a number of marine invertebrate embryos and larvae, representing different phyla, to facilitate comparisons between their surface coats.
(3) The presence of the isoenzymic type of PK which was recognized by the monoclonals, (type L), was traced in five phyla of marine invertebrates by the application of the monoclonal antibodies A, B and C. 4.
(4) The complete nucleotide sequence of 16S rRNA from Propionigenium modestum was determined and compared with 380 16S rRNA sequences from representatives of all eu- and archaebacterial phyla known so far.
(5) Proteins in which some or all of the tyrosine side chains are post-translationally modified to dihydroxyphenylalanine have been found in several invertebrate phyla.
(6) Inasmuch as the identified neural circuits discussed in this review pertain only to the nervous systems of two invertebrate species, one may ask whether or not these findings are generally applicable to central nervous oscillators that generate rhythmic movements in animals of other species and phyla, particularly in the vertebrates.
(7) Phylogenetic trees also reveal an adaptive radiation within the eubacteria and another within the eukaryotes for the origins of most major phyla within each group during the Precambrian era.
(8) This shows that cycloartenol, the sterol precursor in plants and algae, is also the sterol precursor in Naegleria species, and that these amoebae, like A. polyphaga, are related by some biosynthetic pathways to photosynthetic phyla.
(9) We show that the sequence of Drosophila cyclin B has greater identity with B-type cyclins from other animal phyla than with Drosophila cyclin A, suggesting that the two cyclins have distinct roles that have been maintained in evolution.
(10) 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.
(11) Different phyla solved the various problems differently; sometimes there was convergent evolution.
(12) The evolutionary importance of a generalized intercellular communication system can be appreciated when one considers the widespread prevalence of gap junctions within animals of all multicellular phyla, and within almost all tissues of vertebrates.
(13) In invertebrates, belonging to the protostomian evolution line, the neuronal parts of the NES predominate markedly, and in the most highly developed phyla, such as artropods and molluscs, clear-cut evidence has been obtained for the presence of cells producing members of the islet hormone families.
(14) Serotonergic terminal fields appeared to be conserved across phyla with additional innervation evident in specialized sensory regions such as the electrosensory nuclei of gymnotiform and mormyriform fish.
(15) egl-5 and mab-5 may constitute a 'mini-cluster' of regional determination genes, similar to those described in other animal phyla.
(16) The first cyclic sterol precursor is cycloartenol, which is the sterol precursor in all photosynthetic phyla.
(17) Besides giving clues about the mechanisms by which tRNA genes move during mitochondrial DNA evolution, this finding leads us to propose a pathway relating the arrangements of other genes in mitochondrial DNAs from four animal phyla.
(18) 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.
(19) The domain, PFMPNLVPPKI is encoded by the 5' region of the cardiac gene exon 10 and is present in hearts across a broad range of phyla.
(20) This generalization spans nearly eight orders of magnitude in body mass and includes two phyla.
Physa
Definition:
(n.) A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond.
Example Sentences:
(1) Bayluscide caused a reduction in the viability of egg-masses produced by treated Physa acuta or Helisoma duryi snails since they produced higher numbers of abnormal eggs containing dead embryo.
(2) Groups of 10 tropical snails (Biomphalaria glabrata) and 10 pond snails (Physa spp) were also exposed to the crude extract in 50 ml of water at concentrations of 0.0, 1.0, 1.5, 2.0, 2.2, 2.5, 3.0, 4.0 or 5.0 ppm.
(3) The present study deals with investigations on the susceptibility of Iraqi B. truncatus, Gyranaulus ehrenbergi, Physa c.f.
(4) Malacophagous larvae of the fly Sepedon scapularis Adams were shown experimentally to be effective predators of three species of aquatic pulmonate snails tested as prey: Bulinus africanus (Krauss) an important intermediate host of Schistosoma haematobium (Bilharz), Bulinus tropicus (Krauss) and the invasive species Physa acuta Draparnaud.
(5) Five kinds of freshwater snails (168 Radix auricularia coreana, 534 Physa acuta, 144 Hippeutis cantori, 56 Cipangopaludina chinensis malleata and 125 Semisulcospira nodifila globus) examined for the cercariae of echinostomes showed negative results.
(6) While removing the vitelline membrane mechanically or by trypsinization, one or two blastomeres were isolated from two-, four- and eight-celled embryos Lymnaea stagnalis, Physa fontinalis and Ph.
(7) It is concluded that S.scapularis is potentially useful as a biological control agent for use against indigenous Bulinus and exotic Physa snails.
(8) Malacological surveys in the gutters, creeks, streams and stagnant waterbodies within the city showed the presence of Lymnaea natalensis, Bulinus forskalii, Pila ovata, Melanoides tuberculata, Physa sp., Lanistes ovum and Segmentorbis sp.
(9) Radioactivity was rapidly incorporated in all lymnaeid species tested (L. stagnalis, L. tomentosa and L. truncatula) whereas no radioactivity could be demonstrated in non-lymnaeid pulmonate species (Aplexa hypnorum, Physa acuta, Physa fontinalis, Anisus vortex, Gyraulus albus and Planorbis planorbis) or in the prosobranchs Valvata cristata and Valvata piscinalis.
(10) Evidence is presented that there are three morphogenetic waves in early development of Physa acuta: a) around 24-cell stage, b) at early gastrula, and c) at early trochophore, using a proflavin biological test.
(11) (Trematoda) metacercariae obtained from Physa heterostropha snails and from adults grown in the upper ileum of the domestic chick.
(12) In the experiments with mollusks Physa, the inhibition of enzyme under the action of pesticides has been revealed.
(13) Bayluscide application caused significant and highly significant reduction in the fecundity of both Physa acuta and Helisoma duryi.
(14) Mother and daughter sporocysts and xiphidiocercariae of Haematoloechus coloradensis develop in the snail, Physa virgata.
(15) When freshwater snails, Cipangopaludina japonica and Physa acuta, were exposed to 0.1 ppm [14C]fenitrothion in a dynamic flow system, the concentrations of fenitrothion and 14C in the body reached equilibrium on Day 1 of exposure.
(16) No development occurred in Physa acuta or Lymnaea lagotis euphratica.
(17) Significantly, more normal cysts were formed in mucus of Helisoma than in mucus of Physa or Lymnaea.
(18) In this study 624 molluscs of the following species were examined: Drepanotrema anatinum, D. lucidum, D. depressissimum, Biomphalaria straminea, D. schrammi, Physa marmorata, Lymnaea columella, Pomacea and Eupera.
(19) Moreover, application of 1 ppm Bayluscide for two hours against Physa acuta caused a decrease in the size of egg-masses produced by treated snails.
(20) The attraction exercised over Schistosoma mansoni miracidia by Biomphalaria straminea, Lymnaea columella and Physa sp using a specially designed apparatus consisting of two circular glass chambers joined by an open channel were studied.