ASCIDIAN NEWS*
Gretchen and Charles Lambert
206-365-3734
glambert@fullerton.edu or clambert@fullerton.edu
home page: http://depts.washington.edu/ascidian/
Number 57 June 2005
In March and early
April Charlie taught a course that dealt chiefly with ascidians at the
Sugashima Marine Station of Nagoya University with Hitoshi Sawada and Yoshito
Hirada. During this period he also had an opportunity to visit Teruaki
Nishikawa in his lab at
During June and July we will be in
*Ascidian
News is not part of the scientific literature and should not be cited as such.
1. The International Invasive Sea Squirt Conference at Woods Hole,
http://www.whoi.edu/institutes/oli/activities/seasquirt-program.html
Just click on the individual titles to read the abstracts. The Proceedings will be published in the Journal of Experimental Marine Biology and Ecology, with Bob Whitlatch generously donating a great deal of his time to be the guest editor of this special edition. Attendees wishing to submit manuscripts must do so to Bob by July 1. robert.whitlatch@uconn.edu
2. Don’t forget the Third International Tunicata meeting,
3. The January 2005 special issue of Canadian
Journal of Zoology on the Protochordata is now out (vol. 83 number 1): The issue is dedicated to Dr. Norman J.
Berrill. This is the journal’s 4th special review on various invertebrate groups;
earlier ones are annelids (Feb. 2001), echinoderms (July 2001) and cnidarians
(Nov. 2002). The editors K.G. Davey, A.S.M. Saleuddin and M.B. Fenton have
provided a short Foreword. Titles of all the included papers are marked with an
asterisk * in the New Publications section at the end of this
newsletter. You can order a copy of this issue for $35.00 (
4. From Françoise and
Claude Monniot: we continue our taxonomic work at the Museum National
d’Histoire Naturelle in Paris, with most of our time devoted to tropical
ascidians from the western Pacific and Indian Oceans. These specimens have
significantly increased the MNHN collections. A new paper about the
Polyclinidae and Polycitoridae from the western
Numerous splendid photos are sent to us from all parts of the world, but we are sorry to repeat that serious identifications cannot be given if the picture is not accompanied by the specimen.
4. Recipe for Styela clava!!! Available online (and copyrighted) from the Korea National Tourism organization. It’s called Mideodok-chim (steamed Styela clava). Mmmmmmm. Maybe it’s the garlic, shredded beef, clams, green pepper, onions, watercress, bean sprouts, etc. that make it sound so good (and some sake wouldn’t hurt). If anyone has other recipes for ascidians, please send them to us.
http://english.tour2korea.com/05food/LocalFood/gs_13.asp?kosm=m5_3&konum=5
Didemnum sp.
update from Gretchen Lambert: I continue to receive reports of new
sightings of this highly invasive species. We now know of 3 sites in
This information is unpublished, is for readers of Ascidian News only, and must not be cited in any publications!!! This is an ongoing investigation as people around the world struggle to cope with and understand this species.
THESIS ABSTRACTS
1. Yureiboya Comparative Genomics.
(Yureiboya means "ghost ascidian" in Japanese, the common term for
the Ciona genus.) Dave Johnson, Dept. of Genetics,
We use the ascidians Ciona savignyi and Ciona intestinalis, as model systems to investigate current issues in comparative genomics. First, we develop genomics resources for Ciona savignyi, including a genome sequencing effort. We then characterize the relationship between noncoding sequence constraint and function. We find that the high level of sequence divergence, coupled with virtually identical embryology, makes noncoding sequence comparisons between the Ciona species uniquely sensitive. We then use computational and functional methods to characterize the Ciona muscle-specific regulatory module. We find that conserved clusters of muscle-specific motifs are sensitive predictors of function. We search the C. savignyi genome for conserved motif clusters and find new enhancers with complex expression patterns. Finally, we use five exemplary gene families to examine evolutionary trends of 5¹ regions and their corresponding proteins (paralogues and orthologues). We find that constraint in 5¹ regions and proteins sequences are highly correlated. This work demonstrates that Ciona has strong potential to solve problems that are of interest to the greater genomics community.
2.
Ascidians Associated With Coral Reef in
Studies on the different habitats of
ascidians in the Tuticorin sea has not been carried out earlier. Hence a preliminary attempt has been made to
study the ascidians associated with the coral reef of Tuticorin coast. This survey carried out for a period of one
year showed the presence of 34 species of ascidians belonging to 9 families and
20 genera. The number of genera of
ascidians reported from
3. Multidisciplinary
studies of the genus Cystodytes (Ascidiacea): from molecules to
species. Susanna López-Legentil, Fac. of Biol.,
Intraspecies variability is
widespread in marine invertebrates. Previous reports of Cystodytes (Ascidiacea,
Polycitoridae) in the
1. Benthic Ecology
Meeting,
Gross patterns
of settlement have been documented for numerous species, however, few studies
have examined fine-scale patterns of settlement. We used automated in situ sampling devices to monitor diurnal, lunar, and tidal patterns of settlement by invertebrate larvae
in
2.
Didemnum sp. is a rapidly spreading invasive
colonial ascidian that has recently become established on the east and west
coasts of
3. 108th annual meeting of Texas Academy of Science, Univ. of Texas Pan American, Edinburg, Texas, 3-5 March 2005.
Oxidative stress affects late, but not early, embryogenesis in Ascidia interrupta. Anna Stwora, Zen Faulkes,* Univ. of Texas Pan American, Edinburg, TX, and Virginia L. Scofield, Univ. of Texas M.D. Anderson Cancer Center Sci. Park Research Division, Smithville, TX
Ascidians are classic model
organisms for the study of development, and sensitive bioindicators of habitat
degradation. Oxidative stress is a common source of cell damage that can be
caused by many environmental agents. To identify toxic effects of environmental
oxidants on ascidian embryogenesis, we examined the effects of the oxidant
hydrogen peroxide on the development of tadpole larvae of Ascidia interrupta. A.
interrupta were collected from the waters around South Padre Island, Texas.
Gametes were fertilized in vitro. After first cleavage, embryos were subjected
to oxidative stress by bath applying hydrogen peroxide in concentrations ranging
from 0.002 µM to 2 mM. Hydrogen peroxide affected development in a dose
dependent fashion: no gross defects or developmental delays were observed at
concentrations < 20 µM, whereas embryos in concentrations > 20 µM
developed normally until they reached gastrulation, at which point development
halted. These data are consistent with recent research indicating that there
are potent defense mechanisms that protect embryos’ DNA from external stresses
during very early development.
4. VIIth scientific meeting of the
Italian Association for Developmental and Comparative Immunology (IADCI), 10-11
February 2005, Consorzio Universitario Provincia di Trapani, Trapani,
A. Morula cells and non-fusion
reaction in the compound ascidian Botryllus schlosseri
L. Ballarin, F. Parisotto, F. Cima, Dipartimento di Biologia, Università di Padova,
Morula cells (MC) are a common haemocyte-type in the compound ascidian Botryllus
schlosseri, their frequency ranging between 40 and 60% of the circulating
blood cells. They are the effector cells of the non-fusion reaction,
characterised by the appearance of necrotic foci along the contact border,
which occurs when genetically incompatible colonies contact each other. We
previously demonstrated that, in the course of this reaction, MC acquire
immunopositivity to anti-cytokine (IL-1-and TNF-) antibodies, degranulate and
release the enzyme phenoloxidase which is responsible of the cytotoxicity
observed both in vitro (when haemocytes are incubated with blood plasma
(BP) from incompatible colonies) and in vivo (non-fusion reaction).
Subsequently, MC leave the facing marginal ampullae (sausage-like, blind
endings of the colonial marginal vessels to reach the tunic, apparently
attracted by soluble, diffusing factors, where they degenerate and contribute
to the formation of the cytotoxic spots. In the present work, we focussed on
the chemotactic recruitment of MC in the course of the nonfusion reaction. As a
first approach, we studied the distribution of MC inside the facing marginal
ampullae of both contacting colonies (either non-fusible or fusible) and
solitary ones. Results clearly indicates a significantly higher concentration
of MC inside facing marginal ampullae of incompatible colonies with respect to
compatible colonies; the latter concentration is, however, significantly higher
than that inside ampullae from solitary colonies. In addition, we used
Transwell chambers to evaluate whether incompatible BP has chemotactic
properties. We put haemocyte suspensions in filtered sea water (FSW) in the
upper wells and BP from either incompatible or compatible colonies in the lower
wells. We observed a significant increase migration of haemocytes, and of MC in
particular, in the presence of incompatible BP. This migration was
significantly decreased by the addition of anti-cytokine (IL-1- α, TNF- α or IL-8) antibodies, suggesting that
molecules recognised by these antibodies can be responsible for the chemotaxis
observed.
B. Responses of Botryllus
schlosseri immunocytes to exogenous cytokines: results and perspectives. A. Menin,
L. Ballarin. Dipartimento di Biologia, Università di
Padova,
We studied the effects of recombinant TNF-α, IL-1-α and IL-8 and of antibodies
raised against mammalian cytokines (polyclonal anti- TNF-α and anti- IL-1-α, monoclonal anti-IL-8 and anti-IL-12)
on phagocytes of the colonial ascidian Botryllus schlosseri. In
particular, we analysed the ability of phagocytes to assume an amoeboid shape
(expressed as amoebocytic index) and to phagocyte yeast cells (expressed as
phagocytic index). rTNF- α and rIL-1- α have no effects on both the
amoebocytic and the phagocytic index, whereas rIL-8 significantly increases
both the indexes. The observed increase in the phagocytic index was absent in
the presence of calphostin C 0.1 µM, an inhibitor of PKC, and of H89 1 µM, an
inhibitor of PKA, indicating the involvement of both the cAMP and IP3 pathways
in signal transduction required for phagocytosis to occur. The IL-8- induced
increase in amoebocytic and phagocytic index was not observed when haemocytes
were pre-incubated in the presence of suramin 0.7 mM, a protein G inhibitor.
Anti- TNF-α, anti-IL-1-α and anti-IL-8 antibodies significantly
reduce the above indexes; no effects were observed in the presence of
anti-IL-12. Our results suggest the presence of molecules able to cross-react
with mammalian antibodies, involved in the regulation of phagocyte behaviour.
5. XI
International Symposium of Marine Natural Products.
A. Direct
rapid chemotyping of minute samples from tunicates, marine sponges and
associated bacteria with MALDI-TOF Mass Spectrometry. Dieckmann, R.,
López-Legentil, S., Turon, X., von Döhren, H. Fac. of Biol.,
Sessile marine animals
coexisting with and harboring specific microbial populations show variable
morphologies and compositions depending on colony structure, environmental
conditions and genotypes. Probing chemical composition with minimal invasive
techniques with respect to both
metabolites and macromolecules can be accomplished with several highly
sensitive techniques including MALDI-TOF mass spectrometry. In addition to the
characterization of minute environmental samples from different sources, this
technique permits also the rapid dereplication of large numbers of bacteria
with respect to diversity and biosynthetic activities. We have used a mass
spectrometric approach for rapid characterization of metabolites in ascidians
and sponges. In ascidians, we have determined the presence of e.g. didemnines
in Trididemnum solidum and Aplidium albicans,
rubrolides in Synoicum blochmanni and
Ecteinascidins in Ecteinascidia turbinata. For the species Cystodytes dellechiajei, we have
detected the existence of two chemotypes containing the sulfur-containing
pyridoacridines shermilamine B, kuanoniamine D and their deacetylated forms, or
the C9-unsubstituted pyridoacridines ascididemine and 11-hydroxyascididemin.
In sponges, chemotype determination of
the sponges Axinella damicornis and A. verrucosa yielded identical Maldi-tof
spectra, which suggests the presence of similar microbial populations or
a lack of chemical differentiation of these two species. In an analysis of complex
populations of boreal sponges from the European Lophelia reefs prominent metabolites have been directly identified
e.g. from Geodia baretti (barettin)
and Spongosorites (topsentins).
Intact-Cell mass spectrometric profiles (ICM-MS) of metabolites and macromolecules
in the range up to 20 kDa also provide rapid essential information to
dereplicate bacterial isolates from marine sources with respect to
phylogenetic differences and
biosynthetic activities. The ease and speed of the method makes the mass spectral
analysis the method of choice for the screening of large numbers of isolates
and to identify new or rare groups.
B. Intraspecific
variability in the pyridoacridine composition of the ascidian Cystodytes
dellechiajei. Bontemps-Subiélos, N., López-Legentil, S., Jamme,
F., Long, C., Banaigs, B. Fac. of Biol.,
Intraspecies variability has been a long-standing source of taxonomic and biological controversy. Species having a large range of distribution (or cosmopolitans) usually show some morphological differences, usually related to their geographical or bathymetric distribution. Color variation is perhaps the difference most frequently reported, but texture, general shape and other morphological characters may also change from one individual to another. However, the possible implications of these variations in secondary chemistry remain unknown. Cystodytes dellechiajei (Della Valle, 1877) (Aplousobranchiata, Polycitoridae) is a colonial soft-bodied ascidian widely distributed around the world in tropical and temperate waters. Although some spicular and color differences exist, so far there is little basis to split C. dellechiajei into several species mainly because the morphology of zooids is remarkably uniform. Several pyridoacridines, a group of highly colored polycyclic aromatic alkaloids, were reported in C. dellechiajei, among these ascididemin, 11-hydroxyascididemin, cystodytins A-I, shermilamine B, kuanoniamine D and sebastianines A and B.
To determine the relationship between secondary
chemistry and morphotype variation, the pyridoacridine distribution in 4 color
morphs (green, blue, purple and brown) of C.
dellechiajei from the western
Besides, two major chemotypes were found: the first presented the sulfur-containing pyridoacridines shermilamine B and kuanoniamine D, corresponding to the purple morph. The second, presented the C10-unsubstituted pyridoacridines: ascididemin and 11-hydroxyascididemin, corresponding to the blue and green morphs. No alkaloid was observed in the brown form. The pyridoacridine alkaloids identified in this study were characterized by a combination of mass spectrometry and one and two-dimensional NMR techniques on purified compounds. The structure elucidation of the 3 new compounds, deacetylshermilamine B from the purple morph and cystodimines A and B from the blue-green morphs is described together with the 2 chemotypes characterized by high performance liquid chromatography coupled with photodiode array detection or mass spectrometry.
6. XIII
Iberian Symposium on Marine Benthos.
Intraspecies
variability is widespread in marine invertebrates. Size, colour, texture,
general shape and secondary chemistry can differ quite drastically from one
individual or population to another. We chose as case study the colonial ascidian
Cystodytes dellechiajei (Polycitoridae), which presents several
morphotypes differing mainly in color and spicular composition. New molecular
and chemical tools enable us to assess the taxonomic status of these
morphotypes. To determine whether variation observed in Mediterranean C.
dellechiajei has a genetic basis, we sequenced 45 specimens from eight
locations of the western
Titles
of all the papers in the special Protochordate issue of the Canadian Journal of
Zoology are marked with an asterisk *.
Aiello, A.,
Fattorusso, E., Luciano, P., Macho, A., Menna, M. and Munoz, E. 2005. Antitumor
effects of two novel naturally occurring terpene qinones isolated from the
Mediterranean ascidian Aplidium conicum. J. Med. Chem. 48:
3410-3416.
Ballarin, L., Menin,
A., Franchi, N., Bertoloni, G. and Cima, F. 2005. Morula cells and non-self
recognition in the compound ascidian Botryllus schlosseri. Invert.
Survival J. 2: 1-5.
Barenbrock, J. S. and
Kock, M. 2005. Screening enzyme-inhibitory activity in several ascidian species
from
*Bates, W. R. 2005.
Environmental factors affecting reproduction and development in ascidians and
other protochordates.
Bellas, J., Beiras,
R., Marino-Balsa, J. and Fernández, N. 2005. Toxicity of organic compounds to
marine invertebrate embryos and larvae: A comparison between the sea urchin
embryogenesis bioassay and alternative test species. Ecotoxicology 14:
337-353.
Bennett, C. E. and
Marshall, D. J. 2005. The relative energetic costs of the larval period, larval
swimming and metamorphosis for the ascidian Diplosoma listerianum. Mar.
Freshw. Behav. Physiol. 38: 21-29.
Blunt, J. W., Copp, B.
R., Munro, M. H., Northcote, P. T. and Prinsep, M. R. 2005. Marine natural
products. Nat. Prod. Rep. 22: 15-61.
Braithwaite, R. A. and
McEvoy, L. A. 2005. Marine biofouling on fish farms and its remediation. Adv.
Mar. Biol. 47: 215-252.
Bullard, S. G. and
Whitlatch, R. B. 2004. A guide to the larval and juvenile stages of common Long
Island Sound ascidians and bryozoans. Connecticut Sea Grant Communications Office,
Univ. of CT, 1080 Shennecossett Road, Groton, CT 06340, Groton, CT.
*Cameron, C. B. 2005.
A phylogeny of the hemichordates based on morphological characters.
Castilla, J. C.,
Uribe, M., Bahamonde, N., Clarke, M., Desqueyroux-Faúndez, R., Kong,
Christiaen, L.,
Bourrat, F. and Joly, J. S. 2005. A modular cis-regulatory system controls
isoform-specific pitx expression in ascidian stomodaeum. Dev. Biol. 277: 557-566.
*Cone, A. C. and
Zeller, R. W. 2005. Using ascidian embryos to study the evolution of
developmental gene regulatory networks.
Davis, H. H. and
Davis, M. E. 2004. The distribution limits of Styela clava (Tunicata,
Ascidiacea) in European waters. Porcupine Mar. Nat. Hist. Soc. Newsletter 15:
35-43.
Davis, M. H. and
Davis, M. E. 2005. Styela clava (Tunicata: Ascidiacea) -- a new addition
to the fauna of the Portuguese coast. J. Mar. Biol. Ass.
Dolcemascolo, G.,
Gianguzza, P., Pellerito, C., Pellerito, L. and Gianguzza, M. 2005. Effects of
tri-n-butyltin(IV) chloride on neurulation of Ciona intestinalis
(Tunicata, Ascidiacea): an ultrastructural study. Applied Organometal. Chem. 19:
11-22.
Du Pasquier, L. 2004.
Speculations on the origin of the vertebrate immune system. Immunol. Lett. 92:
3-9.
Duckworth, A. R.,
Samples, G. A., Wright, A. E. et al. 2004. In vitro culture of the ascidian Ecteinascidia
turbinata to supply the antitumor compounds ecteinascidins. Aquaculture 241:
427-439.
Edvardsen, R. B.,
Lerat, E., Maeland, A. D., Flat, M., Tewari, R., Jensen, M. F., Lehrach, H., Reinhardt,
R., Seo, H. C. and Chourrout, D. 2004. Hypervariable and highly divergent
intron-exon organizations in the chordate Oikopleura dioica. J. Molec. Evol. 59:
448-457.
Faasse, M. and H., D. B. 2002. De exotische samengestelde zakpijp Botrylloides
violaceus Oka, 1927 in Nederland (Ascidiacea: Pleurogona: Styelidae). Het
Zeepaard 62: 136-141.
Faasse, M. A. 2004. De Aziatische zakpijp Perophora japonica Oka,
1927 in Nederland. Het Zeepaard 64:
179-182.
Fujiwara, S. 2005.
Promoter activity of the retinoic acid receptor gene in the Ciona
intestinalis embryo. Dev. Dyn. 232: 1124-1130.
Fusetani, N. 2004.
Search for drug leads from Japanese marine invertebrates. J. Synthetic Org.
Chem. Japan 62: 1073-1079.
Granato, A. C., de
Oliveira, J. H. H. L., Seleghim, M. H. R., Berlinck, R. G. S., Macedo, M. L.,
Ferreira, A. G., Rocha, R. M., Hajdu, E. M., Peixinho, S., Pessoa, C. O.,
Moraes, M. O. and Cavalcanti, B. C. 2005. Natural products from the ascidian Botrylloides
giganteum, from the sponges Verongula gigantea, Ircinia felix, Cliona
delitrix and from the nudibranch Tambja eliora, from the Brazilian coastline.
Quím. Nova 28: 192-198.
Hamada, T., Asanuma,
M., Ueki, T., Hayashi, F., Kobayashi, N., Yokoyama, S., Michibata, H. and
Hirota, H. 2005. Solution structure of
Vanabin2, a vanadium(IV)-binding protein from the vanadium-rich ascidian, Ascidia sydneiensis samea.
J. Amer. Chem. Soc. 127: 4216-4222.
Hirose, E., Akahori,
M.,
Hirose, E., Oka, A. T.
and Akahori, M. 2005. Sexual reproduction of the photosymbiotic ascidian Diplosoma
virens in the Ryukyu Archipelago, Japan: vertical transmission, seasonal
change, and possible impact of parasitic copepods. Mar. Biol. 146:
677-682.
Hiruta, J., Mazet, F.,
Yasui, K., Zhang, P. and Ogasawara, M. 2005. Comparative expression analysis of
transcription factor genes in the endostyle of invertebrate chordates. Dev.
Dyn. 233 (3, July).
Holland, L. Z. 2005.
Non-neural ectoderm is really neural: evolution of developmental patterning
mechanisms in the non-neural ectoderm of chordates and the problem of sensory
cell homologies. J. Exp. Zool. B: Mol. Dev. Evol. April: 304B.
Hudson, C. and Yasuo,
H. 2005. Patterning across the ascidian neural plate by lateral Nodal
signalling sources. Development 132: 1199-1210.
Ikuta, T. and Saiga,
H. 2005. Organization of Hox genes in ascidians: Present, past, and future.
Dev. Dyn.
Iwanaga, S. and Lee,
B. L. 2005. Recent advances in the innate immunity of invertebrate animals. J.
Biochem. Mol. Biol. 38: 128-150.
Iwasaki, K., Kimura,
T., Kinoshita, K., Yamaguchi, T., Nishikawa, T., Nishi, E., Yamanishi, R.,
Hayashi,
Jiang, D., Munro, E.
M. and Smith, W. C. 2005. Ascidian prickle regulates both mediolateral and
anterior-posterior cell polarity of notochord cells. Curr. Biol. 15:
79-85.
Jiang, D., Tresser, J.
W., Horie, T., Tsuda, M. and Smith, W. C. 2005. Pigmentation in the sensory
organs of the ascidian larva is essential for normal behavior. J. Exp. Biol. 208:
433-438.
Katsuyama, Y., Okada,
T., Matsumoto, J., Ohtsuka, Y., Terashima, T. and Okamura, Y. 2005. Early
specification of ascidian larval motor neurons. Dev. Biol. 278: 310-322.
Kavanaugh, S. I.,
Root, A. R. and Sower, S. A. 2005. Distribution of gonadotropin-releasing
hormone (GnRH) by in situ hybridization in the tunicate Ciona intestinalis.
Gen. Comp. Endocrinol. 141: 76-83.
Kawashima, T., Satou,
Y., Murakami , S. D. and Satoh, N. 2005. Dynamic changes in developmental gene
expression in the basal chordate Ciona intestinalis. Dev. Growth &
Differ. 47: 187-199.
Kelaher, B. P. and
Castilla, J. C. 2005. Habitat characteristics influence macrofaunal communities
in coralline turf more than mesoscale coastal upwelling on the coast of
Keys, D. N., Lee, B.
I., Di Gregorio, A., Harafuji, N., Detter, J. C., Wang, M., Kahsai, O., Ahn,
S., Zhang, C., Doyle, S. A., Satoh, N., Satou, Y., Saiga, H., Christian, A. T.,
Rokhsar, D. S., Hawkins, T. L., Levine, M. and Richardson, P. M. 2005. A
saturation screen for cis-acting regulatory DNA in the Hox genes of Ciona
intestinalis. Proc. Natl. Acad. Sci. 102: 679-683.
Kimura, S. and Itoh,
T. 2004. Cellulose synthesizing terminal complexes in the ascidians. Cellulose 11:
377-383.
Knott, N. A., Davis,
A. R. and Buttemer, W. A. 2004. Passive flow through an unstalked intertidal
ascidian: orientation and morphology enhance suspension feeding in Pyura
stolonifera. Biol. Bull. 207: 217-224.
Knott, N. A.,
Underwood, A. J., Chapman, M. G. and Glasby, T. M. 2004. Epibiota on vertical
and on horizontal surfaces on natural reefs and on artificial structures. J.
Mar. Biol. Ass.
Kott, P. 2004.
Ascidiacea (Tunicata) in Australian waters of the
Kusakabe, T. 2005.
Decoding cis-regulatory systems in ascidians. Zool. Sci. 22: 129-146.
Lacalli, T. C. 2004. Light
on ancient photoreceptors. Nature 432: 454-455.
*Lacalli, T. C. 2005.
Protochordate body plan and the evolutionary role of larvae: old controversies
resolved?
*Lambert, C. C. 2005.
Historical introduction, overview, and reproductive biology of the
protochordates.
Lambert , C. C. 2005.
Signaling pathways in ascidian oocyte maturation: Effects of various inhibitors
and activators on germinal vesicle breakdown. Develop. Growth Differ. 47:
265–272.
Lambert, G. 2005.
First North American record of the ascidian Perophora japonica. J. Mar.
Biol. Ass.
*Lambert, G. 2005.
Ecology and natural history of the protochordates.
*Mackie, G. O. and
Burighel, P. 2005. The nervous system in adult tunicates: current research
directions.
Marshall, D. J. and
Keough, M. J. 2005. Offspring size effects in the marine environment: A field
test for a colonial invertebrate. Austral Ecol. 30: 275–280.
Marshall, K. M. and
Barrows, L. R. 2004. Biological activities of pyridoacridines. Nat. Prod. Rep. 21:
731-751.
Matsuoka, T., Awazu,
S., Shoguchi, E., Satoh, N. and Sasakura, Y. 2005. Germline transgenesis of the
ascidian Ciona intestinalis by electroporation. Genesis 41: 67-72.
*McHenry, M. J. 2005.
The morphology, behavior, and biomechanics of swimming in ascidian larvae.
Meenakshi, V. K. 2004.
New records of five species of colonial ascidians of the genus Ecteinascidia
Herdman, 1880 from the
Meenakshi, V. K. 2004.
Addition to the ascidian fauna of
Meenakshi, V. K. 2004.
Conservation strategies and action plan for the prochordates. 17 – 30.
Meenakshi, V. K. and
Senthamarai, S. 2004. First report of a simple ascidian – Phallusia arabica
Savigny, 1816 from Tuticorin coast of
Meenakshi, V. K. and
Senthamarai, S. 2004. Styela plicata (Lesueur, 1823) – A simple ascidian
new to Indian waters from Tuticorin coast. J.
Meenakshi, V. K. and
Senthamarai, S. 2004. Ascidians associated with coral reefs in Tuticorin.
*Meinertzhagen,
Moody, W. J. 2004.
Subtype-specific mechanisms for regulating K+ channel density during
development. Focus on "The carboxyl tail region of the Kv2.2 subunit
mediates novel developments of channel density". J. Neurophysiol. 92:
3169-3170.
Moret, F., Christiaen,
L., Deyts, C., Blin, M., Vernier, P. and Joly, J. S. 2005. Regulatory gene
expressions in the ascidian ventral sensory vesicle: evolutionary relationships
with the vertebrate hypothalamus. Dev.
Biol. 277: 567-579.
Nakayama, A., Satoh,
N. and Sasakura, Y. 2005. Tissue-specific profile of DNA replication in the
swimming larvae of Ciona intestinalis. Zool. Sci. 22: 301-309.
Nishikawa, T. 2004. A
new deep-water lancelet (Cephalochordata) from off
Nishikawa, T. 2005. An
atrial membrane in the colonial ascidian, Ritterella tokioka Kott, 1992
(Urochordata: Ascidiacea) from
Oda-Ishii,
Pakhomov, E. A. 2004.
Salp/krill interactions in the eastern Atlantic sector of the Southern Ocean.
Deep Sea Res. Part 2 Topical Studies in Oceanog. 51: 2645-2660.
Pakhomov, E. A. and
Froneman, P. W. 2004. Zooplankton dynamics in the eastern Atlantic sector of
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