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Showing 1 to 18 of 18 for “"ascidian"”.
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Potent but forgotten: nitrous oxide contributions by an ascidian on warming reefs
… a media analysis. I focus on the habitat-forming ascidian Herdmania grandis, which I show is increasing in abundance on warming temperate reefs where carbon-capturing kelp forests have declined. My findings reveal that H. grandis’ microbiota produces the most N2O under present-day summer extreme …
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The Ecology and Demography of the Invasive Ascidian Botrylloides violaceus in the Coos Estuary
… are highly susceptible to invasion by non-native ascidian species. Botrylloides violaceus, a colonial ascidian, is a cosmopolitan invader of fouling communities in bays and harbors including Oregon’s Coos Estuary. This study documents seasonal and spatial patterns of B. violaceus distribution, …
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A path to biodiscovery: isolating Antarctic ascidian-associated bacteria and screening genomes for secondary metabolite-encoded biosynthetic gene clusters and signatures of cold adaptation
… health challenges. One prominent example is the ascidian Synoicum adareanum, found on the seafloor of coastal regions of Antarctica, of interest in part due to one compound, palmerolide A. Palmerolide A is a cytotoxic macrolide with specific activity towards cancer cells which occurs in high …
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DEVELOPMENT OF THE LARVAL PERIPHERAL NERVOUS SYSTEM IN THE ASCIDIAN CIONA INTESTINALIS: ROLE OF THE RETINOIC ACID AND FGF/WNT SIGNALLING PATHWAYS AND OF THE POU TRANSCRIPTION FACTORS.
The research presented in this document focuses on the development of the larval peripheral nervous system of the Tunicate Ciona intestinalis with two main aims: a) to understand how the interactions between Retinoic Acid (RA) and the FGF/WNT pathways control its development; b) to study the role …
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Taxonomic studies on adult and larval ascidians from California
… is to further morphological studies on larval ascidians and to encourage greater reliance on larval structures in ascidian taxonomy. This may necessitate some revisions in current classifications, but it is hoped that such revisions will lead to a better understanding of the group. Some general …
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Marine Bioinvasions in Anthropogenic and Natural Habitats: an Investigation of Nonindigenous Ascidians in British Columbia
… investigated the distribution of nonindigenous ascidians on Southern Vancouver Island, British Columbia, Canada. Third, I tested methods for in-situ larval inoculations and utilized these techniques to manipulate propagule supply and assess post-settlement mortality of ascidians across habitat …
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The effects of Didemnum vexillum overgrowth on Mytilus edulis biology and ecology
<p>Didemnum vexillum is an invasive colonial ascidian in the Gulf of Maine that readily colonizes hard substrates. These substrates include hard-shelled organisms, such as the common blue mussel Mytilus edulis. Preliminary observations and short-term studies showed potential effects of epibiosis on …
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Studies in Marine Natural Product Synthesis, Isolation and Ecology
… and chemical evaluation of 29 New Zealand ascidians has been performed. Significant biological activity was detected in ten ascidians. Novel metabolites isolated were 2-(3'-bromo-4'-hydroxyphenol)ethanamine (Cnemidocarpa bicomuta) and 1,3-dimethylguanine (unidentified ascidian). Known …
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Isolation and Structure Elucidation of Antiproliferative Natural Products from Madagascar
… from Malleastrum sp. From the Malagasy marine ascidian Trididemnum sp. collected in the Indian Ocean, the identification as well as the potential biosynthetic origin of polyketide derived bistramides is reported. n an attempt to explore other facets of natural products chemistry, the second …
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Aspects of marine fouling in western Cape waters
… developed rapidly, while at 20m depth, ascidian and barnacle-dominated communities developed more slowly. The role of primary film formation in the colonization of substrata by invertebrates was investigated in short-term studies conducted in Simonsbay and Table Bay. Surface-bound …
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Functional studies of <i>Ci-Gsx</i> gene in the developing central nervous system of <i>Ciona intestinalis</i>
… patterning of the vertebrate neural rube. In the ascidian Ciona inlesrinalis, the model organism used in this work, a single Gsx ortholog has been identified, named Ci-gsx, whose zygotic expression is localized in the developing CNS, including the precursors of the ocellus photoreceptor cells. …
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Evolutionary and Developmental Survey of Genes Involved in Chordate Pigmentation
… pigmentation, I analyzed a Kelch-like member in ascidian <i>Ciona robusta</i> (<i>Cr-Klhl21</i>). My results point at this gene as a marker of pigmented cells, with a dynamic expression profile during embryogenesis: from middle tailbud stage, it is expressed specifically in the otolith. Moreover, …
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Total Syntheses of 1,2,4-Thiadiazole Natural Products
… A and B (12 and 13) derived from the ascidian Polycarpa aurata, along with the Isatis indigotica derived insatindigothiadiazoles A-D (33a-d) and the unnamed alkaloids 24a and 24b.Thioacylguanidine 126 underwent a novel one-pot, copper(II)-catalysted benzylic oxidationoxidative …
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Influence of increased sediment exposure on suspension-feeder assemblages in a temperate seagrass meadow
… had no influence on the natural diets of the ascidian Herdmania momus and the bivalve Pinna bicolor. For the sponge Tethya sp, the contribution of sedimentary organic matter to its diet increased at sites with high sediment exposure, suggesting a potential benefit to its diet. Overall, the …
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EMISSIVE PEPTIDE NUCLEIC ACIDS (PNAS): POTENTIAL TOOLS FOR INNOVATIVE DIAGNOSTICS AND THERAPEUTICS
… VI. Anti-miR124 PNAs for in vivo studies in ascidian embryos Besides the work on emissive PNAs, a part of this Ph.D. thesis was also dedicated to the study of anti-miR124 PNAs for in vivo studies using ascidian embryos as animal model. Anti-miR PNAs have been employed for studying miRNA …
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Biogeography and potential factors regulating shallow subtidal reef communities in the western Indian Ocean
… by a high biomass of the filter-feeding ascidian Pyura stolonifera and various species of articulated coralline algae. In the Delagoa Overlap Bioregion, a comparatively high diversity of community types was defined, many dominated by algal turf, P. stoloniferaand various Alcyonacea and …
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Dynamics of baseline stable isotopes within a temperate coastal ecosystem: Relationships and projections using physical and biogeochemical factors
… red alga Amphiroa anceps, and the δ13C in the ascidian Herdmania momus and the bivalve Septifer bilocularis, were influenced by variation at replicates (10s of m) and sites (1s of km) over regions (10s of km). Whereas, the reverse was true for δ13C and δ15N in the foliose red alga Plocamium …