Results 191 to 200 of about 339,700 (227)

Allorecognition Between Compound Ascidian Colonies

Zoological Science, 2013
The compound ascidian Botryllus schlosseri reproduces asexually, and forms colonies to adhere to matrices such as rocks. This species has developed a mechanism to distinguish between self stem cells and invasive parasitizing nonself cells from other individuals of the same species, probably as a defense against parasitism. It is highly likely that such
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Chimeras and histocompatibility in the colonial ascidian Botryllus schlosseri

Developmental & Comparative Immunology, 1988
Chimeras of B. schlosseri were prepared by pairwise combination of colonies sharing one allele at the fusibility gene locus (AD = AC chimeras). A frequent resorption of one of the partners was observed and the resorption time was shown to be significantly correlated with the relative size, the resorbing partner being usually the larger.
A, Sabbadin, C, Astorri
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Cellular and molecular mechanisms of regeneration in colonial and solitary Ascidians.

Developmental Biology, 2019
Regenerative ability is highly variable among the metazoans. While many invertebrate organisms are capable of complete regeneration of entire bodies and organs, whole-organ regeneration is limited to very few species in the vertebrate lineages. Tunicates,
Susannah H. Kassmer, Shane Nourizadeh, A. D. De Tomaso   +2 more
semanticscholar   +1 more source

Novel rhamnose-binding lectins from the colonial ascidian Botryllus schlosseri

Developmental & Comparative Immunology, 2008
In a full-length cDNA library from the compound ascidian Botryllus schlosseri, we identified, by BLAST search against UniProt database, five transcripts, each with complete coding sequence, homologous to known rhamnose-binding lectins (RBLs). Comparisons of the predicted amino acid sequences suggest that they represent different isoforms of a novel RBL,
GASPARINI, FABIO, FRANCHI, NICOLA, SPOLAORE, BARBARA, BALLARIN, LORIANO   +3 more
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Colony specificity and chemotaxis in the compound ascidian Botryllus schlosseri

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2006
We re-investigated the behavior of hemocytes during the non-fusion (rejection) reaction between genetically incompatible colonies of the ascidian Botryllus schlosseri. In the course of the reaction, hemocytes - mainly morula cells - crowd inside the blind ends of marginal vascular vessels (known as ampullae) of the colonial leading edge (LE) facing the
CIMA, FRANCESCA, SABBADIN A, ZANIOLO, GIOVANNA, BALLARIN, LORIANO   +3 more
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Characterization of HCN and cardiac function in a colonial ascidian

Journal of Experimental Zoology Part A: Ecological Genetics and Physiology, 2011
AbstractHyperpolarization‐activated, cyclic nucleotide‐gated (HCN) channels generate the rhythmic beating of mammalian hearts. We identified an HCN homolog in the colonial ascidian Botryllus schlosseri, a nonvertebrate chordate which possesses a tubular heart that beats bidirectionally.
Hellbach, Annette, Tiozzo, Stefano, Ohn, Jungho, Liebling, Michael, de Tomaso, Anthony   +4 more
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Whole body regeneration in a colonial ascidian, Botrylloides violaceus

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, 2009
Abstract Colonial ascidians are the only chordates to undergo whole body regeneration (WBR), the ability to form an entirely new individual from the peripheral vasculature. Here we describe WBR in Botrylloides violaceus , a colonial ascidian that reliably regenerates after ...
Federico D, Brown, Elena L, Keeling, Anna D, Le, Billie J, Swalla   +3 more
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Microbial community associated with the colonial ascidian Cystodytes dellechiajei

Environmental Microbiology, 2006
Summary The ascidian Cystodytes dellechiajei (Della Valle, 1877) (phylum Chordata, class Ascidiacea, family Polycitoridae) is a colonial tunicate that inhabits benthic rock environments in the Atlantic, Pacific and Indian Oceans, as well as the Mediterranean Sea.
Manuel, Martínez-García, Marta, Díaz-Valdés, Gerhard, Wanner, Alfonso, Ramos-Esplá, Josefa, Antón   +4 more
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Vasa expression in a colonial ascidian, Botrylloides violaceus

Evolution & Development, 2007
SUMMARY Evolution of solitary or colonial life histories in tunicates is accompanied by dramatic developmental changes that affect morphology and reproduction. We compared vasa expression in a solitary ascidian and a closely related colonial ascidian, in an effort to uncover developmental mechanisms important during the evolution of these ...
Federico D, Brown, Billie J, Swalla
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Telomerase deficiency in a colonial ascidian after prolonged asexual propagation

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, 2011
In organisms that propagate by agametic cloning, the parental body is the reproductive unit and fitness increases with clonal size, so that colonial metazoans, despite lack of experimental data, have been considered potentially immortal. Using asexual propagation rate as a measure of somatic performance, and telomerase activity and relative telomere ...
Helen Nilsson, Sköld, Maria E, Asplund, Christine A, Wood, John D D, Bishop   +3 more
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