11 results match your criteria ectoplasmic net

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Erection of a New Genus and Species for the Pathogen of Hard Clams 'Quahog Parasite Unknown' (QPX): Mucochytrium quahogii gen. nov., sp. nov.

Protist 2021 02 29;172(1):125793. Epub 2021 Jan 29.

School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794-5000, USA. Electronic address:

Quahog Parasite Unknown (QPX) is a facultative parasite of the hard clam, Mercenaria mercenaria. Although it has been observed in clams since the 1960's and cultivated since the 1990's, conflicting reports on important aspects of its biology have prevented its formal description. 18S rRNA gene sequences identify QPX as a thraustochytrid, but its production of copious mucus is atypical for this group. Read More

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February 2021

Nutritional intake of Aplanochytrium (Labyrinthulea, Stramenopiles) from living diatoms revealed by culture experiments suggesting the new prey-predator interactions in the grazing food web of the marine ecosystem.

PLoS One 2019 9;14(1):e0208941. Epub 2019 Jan 9.

Institute for Integrative Neurobiology, Konan University, Okamoto, Higashinada, Kobe, Hyogo, Japan.

Labyrinthuleans (Labyrinthulea, Stramenopiles) are recognized as decomposers in marine ecosystems but their nutrient sources are not fully understood. We conducted two-membered culture experiments with labyrinthuleans and diatoms to discover where labyrinthuleans obtain their nutrients from. The results showed that Aplanochytrium strains obtained nutrients by consuming living diatoms. Read More

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September 2019

Nutritional Intake by Ectoplasmic Nets of Schizochytrium aggregatum (Labyrinthulomycetes, Stramenopiles).

Protist 2018 11 18;169(5):727-743. Epub 2018 Jun 18.

Institute for Integrative Neurobiology, Konan University, 8-9-1, Okamoto, Higashinada, Kobe, Hyogo 658-8501, Japan; Faculty of Science and Engineering, Konan University, 8-9-1, Okamoto, Higashinada, Kobe, Hyogo 658-8501, Japan. Electronic address:

Thraustochytrid cells attach to their food via ectoplasmic nets (ENs). Here, we analyzed the cause and effect relationship between the various forms and functions of ENs of Schizochytrium aggregatum. The ENs spread out over a large area forming a fine network to efficiently search for the experimental food source. Read More

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November 2018

Nutrient recycling of lipid-extracted waste in the production of an oleaginous thraustochytrid.

Appl Microbiol Biotechnol 2016 May 22;100(10):4711-21. Epub 2016 Mar 22.

Department of Process Engineering and Applied Science, Faculty of Engineering, Dalhousie University, Sexton House E102, Halifax, NS, Canada.

Improving the economics of microalgae production for the recovery of microbial oil requires a comprehensive exploration of the measures needed to improve productivity as well as to reduce the overall processing costs. One avenue for cost reduction involves recycling the effluent waste water remaining after lipid extraction. This study investigates the feasibility of recycling those wastes for growing thraustochytrid biomass, a heterotrophic microalgae, where wastes were generated from the enzymatic extraction of the lipids from the cell biomass. Read More

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Adjudin disrupts spermatogenesis via the action of some unlikely partners: Eps8, Arp2/3 complex, drebrin E, PAR6 and 14-3-3.

Spermatogenesis 2011 Oct 1;1(4):291-297. Epub 2011 Oct 1.

Center for Biomedical Research; The Population Council; New York, NY USA.

Adjudin, 1-(2,4-dichlorobenzyl)-1H-indazole-3-carbohydrazide (formerly called AF-2364), is a potent analog of lonidamine [1-(2,4-dichlorobenzyl)-1H-indazole-3-carboxylic acid] known to disrupt germ cell adhesion, most notably elongating and elongated spermatids, in the seminiferous epithelium of adult rat testes and thus, leads to infertility in rats. Since the population of spermatogonia and spermatogonial stem cells (SSCs) in the seminiferous tubules is not significantly reduced by the treatment of rats with adjudin, adjudin-induced infertility is highly reversible, which enables reinitiation of spermatogenesis and germ cell re-population of the voided seminiferous epithelium. Furthermore, adjudin appears to exert its effects at the testis-specific atypical adherens junction (AJ) type known as ectoplasmic specialization (ES), most notably the apical ES at the Sertoli cell-spermatid interface. Read More

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October 2011

Labyrinthulomycetes phylogeny and its implications for the evolutionary loss of chloroplasts and gain of ectoplasmic gliding.

Mol Phylogenet Evol 2009 Jan 17;50(1):129-40. Epub 2008 Oct 17.

Department of Botany, #3529-6270 University Blvd., The University of British Columbia, Vancouver, BC, Canada V6T 1Z4.

The labyrinthulomycetes, also known as the 'Labyrinthulomycota' are saprotrophic or less frequently parasitic stramenopilan protists, usually in marine ecosystems. Their distinguishing feature is an 'ectoplasmic net,' an external cytoplasmic network secreted by a specialized organelle that attaches the cell to its substrate and secretes digestive enzymes for absorptive nutrition. In this study, one of our aims was to infer the phylogenetic position of the labyrinthulomycetes relative to the non-photosynthetic bicoeceans and oomycetes and the photosynthetic ochrophytes and thereby evaluate patterns of change from photosynthesis to saprotrophism among the stramenopiles. Read More

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January 2009

Isolation and characterization of a novel thraustochytrid-like microorganism that efficiently produces docosahexaenoic acid.

Biotechnol Lett 2006 Feb;28(3):197-202

Laboratory of Environmental Molecular Biology, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Kita-ku, 060-0810, Japan.

A thraustochytrid-like microorganism (strain 12B) was isolated from the mangrove area of Okinawa, Japan. On the basis of its ectoplasmic net structure and biflagellate zoospores we determined strain 12B to be a novel member of the phylum Labyrinthulomycota in the kingdom Protoctista. When grown on glucose/seawater at 28 degrees C, it had a lipid content of 58% with docosahexaenoic acid (DHA; 22:6 n-3) at 43% of the total fatty acids. Read More

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February 2006

Thraustochytrium gaertnerium sp. nov.: a new thraustochytrid stramenopilan protist from mangroves of Goa, India.

Protist 2005 Nov 2;156(3):303-15. Epub 2005 Aug 2.

National Institute of Oceanography, Dona Paula, Goa - 403 004, India.

Thraustochytrids are ubiquitous, chemo-organotrophic, marine stramenipilan protists belonging to the class Labyrinthulomycetes. Their taxonomy is largely based on life cycle development stages. We describe here a new species of thraustochytrid isolated from mangroves of Goa, India. Read More

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November 2005

Interactions of proteases, protease inhibitors, and the beta1 integrin/laminin gamma3 protein complex in the regulation of ectoplasmic specialization dynamics in the rat testis.

Biol Reprod 2004 Apr 26;70(4):945-64. Epub 2003 Nov 26.

Population Council, Center for Biomedical Research, New York, New York 10021, USA.

During spermatogenesis, developing germ cells migrate progressively across the seminiferous epithelium. This event requires extensive restructuring of cell-cell actin-based adherens junctions (AJs), such as the ectoplasmic specialization (ES, a testis-specific AJ type), between Sertoli cells and elongating/elongate spermatids. It was postulated that proteases and protease inhibitors worked in a yin-yang relationship to regulate these events. Read More

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A new labyrinthulid isolate, which solely produces n-6 docosapentaenoic acid.

Appl Microbiol Biotechnol 2003 Nov 15;63(1):22-8. Epub 2003 May 15.

National Institute of Advanced Industrial Science and Technology, Higashi 1-1, 305-8566 Tsukuba Ibaraki, Japan.

A labyrinthulid strain, L59, was isolated from a leaf floating on seawater collected at the coastal area of Hokkaido Prefecture, Japan. Strain L59 contained only n-6 docosapentaenoic acid ( n-6 DPA) among all the long-chain polyunsaturated fatty acids. The proportion of n-6 DPA in the total fatty acids was 48. Read More

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November 2003

Bile acid transport by the rat liver canalicular bile acid transport/ecto-ATPase protein is dependent on ATP but not on its own ecto-ATPase activity.

J Biol Chem 1994 Jan;269(4):2820-6

Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri 63110.

We have shown that bile acid efflux and ecto-ATPase activities are two distinct properties of a single rat liver hepatocyte canalicular membrane protein (Sippel, C. J., Suchy, F. Read More

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January 1994
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