Ascidians
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. BioprospecÃÃo de substÃncias com potencial antitumoral em ascÃdias do litoral cearense: estudos com Eudistoma vannamei Millar, 1977 (Urochordata, Ascidiacea)
Este trabalho avaliou, inicialmente, a citotoxicidade dos extratos hidroalcoÃlicos das 10 espÃcies de ascÃdias mais abundantes do litoral cearense atravÃs dos seguintes mÃtodos: toxicidade aguda em larvas de artemias, inibiÃÃo do desenvolvimento dos ovos de ouriÃo-do-mar, potencial hemolÃtico e inibiÃÃo da proliferaÃÃo celular de linhagens tumor
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/05/2004
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14. Aspectos ecológicos e biológicos de esponjas e de ascídias da região entre-marés da praia do Cabo Branco, João Pessoa, Paraíba, Brasil. / Ecological and biological aspects of sponges and ascidians in the intertidal zone of the Cabo Branco beach, João Pessoa, Paraíba, Brazil. Gama, P.B.
O estudo da freqüência de ocorrência, da zonação, do recrutamento, do crescimento e de alguns aspectos da colonização do substrato, foi realizado na região de entre-marés da praia do Cabo Branco, visando o conhecimento da biologia e da ecologia de espécies de esponjas e ascídias. O assoalho bentônico da região de entre-marés e de suas zonas lim
Publicado em: 2003
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15. "Ascidiacea (Chordata: Tunicata) from brazilian tropical coast" / "Ascidiacea (Chordata: Tunicata) do litoral tropical brasileiro"
Embora tenham sido muito estudadas em diversos pontos do globo, as ascídias do litoral brasileiro são pouco conhecidas. A maior parte do litoral brasileiro está incluída na região tropical, para qual as informações são mais escassas. Com o intuito de se conhecer a fauna de ascídias do litoral tropical brasileiro foram realizadas diversas coletas em
Publicado em: 2002
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16. Identification of chlorophyll b in extracts of prokaryotic algae by fluorescence spectroscopy.
Solvent extracts of three different prokaryotic algae from three species of didemnid ascidians contained pigments identified, on the basis of their fluorescence excitation (E)and fluorescence emission (F)spectral maxima (measured in nm) at 77K, as chlorophyll a (E 449, F 678) and chlorophyll b (E 478, F 658). The release of algae on cutting or freezing Diplo
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17. Slime molds, ascidians, and the utility of evolutionary theory
The National Academy of Sciences.
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18. Ascidian gene-expression profiles
Gene-expression profiling will be particularly informative in studies of ascidians, basal chordates whose genomes and embryology are uniquely suited for mapping developmental gene networks.
BioMed Central.
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19. Early lineage specification of long-lived germline precursors in the colonial ascidian Botryllus schlosseri
In many taxa, germline precursors segregate from somatic lineages during embryonic development and are irreversibly committed to gametogenesis. However, in animals that can propagate asexually, germline precursors can originate in adults. Botryllus schlosseri is a colonial ascidian that grows by asexual reproduction, and on a weekly basis regenerates all
Company of Biologists.
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20. Developmental genetics in primitive chordates.
Recent advances in the study of the genetics and genomics of urochordates testify to a renewed interest in this chordate subphylum, believed to be the most primitive extant chordate relatives of the vertebrates. In addition to their primitive nature, many features of their reproduction and early development make the urochordates ideal model chordates for dev
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21. A functional cellulose synthase from ascidian epidermis
Among animals, urochordates (e.g., ascidians) are unique in their ability to biosynthesize cellulose. In ascidians cellulose is synthesized in the epidermis and incorporated into a protective coat know as the tunic. A putative cellulose synthase-like gene was first identified in the genome sequences of the ascidian Ciona intestinalis. We describe here a cell
National Academy of Sciences.
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22. rRNA genes from the lower chordate Herdmania momus: structural similarity with higher eukaryotes.
Ascidians, primitive chordates that have retained features of the likely progenitors to all vertebrates, are a useful model to study the evolutionary relationship of chordates to other animals. We have selected the well characterized ribosomal RNA (rRNA) genes to investigate this relationship, and we describe here the cloning and characterization of an entir
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23. Alleopathy and spatial competition among coral reef invertebrates
Species of ectoprocts and solitary encrusting animals were subjected in aquaria to homogenates of 11 sympatric species of sponges and colonial ascidians. Five of the nine sponge species and one of the two ascidian species exhibited species-specific allelochemical effects. Evidence suggests that alleochemical provide a wide-spread, specific, and complex mecha
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24. Light-harvesting chlorophyll c-like pigment in Prochloron.
A chlorophyll c-like pigment, similar to magnesium-3,8-divinyl pheoporphyrin a5 monomethyl ester, has been isolated from Prochloron sp. obtained from five species of didemnid ascidians from the Great Barrier Reef, Australia, and from Palau, Micronesia. The pigment represents 4-15% of the total chlorophyll content and is shown to function in a light-harvestin