Asterias
Echinodermata
Cerebrosides
Ca2+ spikes in the flagellum control chemotactic behavior of sperm. (1/14)
The events that occur during chemotaxis of sperm are only partly known. As an essential step toward determining the underlying mechanism, we have recorded Ca2+ dynamics in swimming sperm of marine invertebrates. Stimulation of the sea urchin Arbacia punctulata by the chemoattractant or by intracellular cGMP evokes Ca2+ spikes in the flagellum. A Ca2+ spike elicits a turn in the trajectory followed by a period of straight swimming ('turn-and-run'). The train of Ca2+ spikes gives rise to repetitive loop-like movements. When sperm swim in a concentration gradient of the attractant, the Ca2+ spikes and the stimulus function are synchronized, suggesting that precise timing of Ca2+ spikes controls navigation. We identified the peptide asterosap as a chemotactic factor of the starfish Asterias amurensis. The Ca2+ spikes and swimming behavior of sperm from starfish and sea urchin are similar, implying that the signaling pathway of chemotaxis has been conserved for almost 500 million years. (+info)Yolk granule tethering: a role in cell resealing and identification of several protein components. (2/14)
Homotypic fusion among echinoderm egg yolk granules has previously been reconstituted in vitro, and shown to be a rapid, Ca2+-triggered reaction that can produce extremely large (>10 microm diameter) fusion products. We here show that, prior to Ca2+-triggered fusion, yolk granules in vitro, if isolated in an appropriate buffer, became tethered to one another, forming large aggregates of more than 100 granules. Granule washing with mildly chaotropic salt abolished this tethering reaction, and prevented Ca2+-triggered formation of the large fusion products characteristic of tethered granules. Protein factors present in the wash restored tethering activity and these factors could be substantially enriched by anion exchange chromatography. The enriched fraction behaved under native conditions as a high molecular weight (approximately 670 kDa), multisubunit complex of at least seven proteins. Monoclonal antibodies directed against this complex of proteins were capable of immunodepleting tethering activity, confirming the role of the complex in granule tethering. These antibodies selectively stained the surface of yolk granules in the intact egg. We therefore propose a new role for tethering: it can promote the formation of large vesicular fusion products, such as those required for successful resealing. We have, moreover, identified several proteins that may be critical to this tethering mechanism. (+info)Acrosome reaction is subfamily specific in sea star fertilization. (3/14)
In the fertilization process of sea stars, sperm is activated to go through the acrosome reaction before cell fusion. We focused on induction of the acrosome reaction as a key process in fertilization. Six species of sea stars were used in this study: Asterias amurensis, Asterias rubens, Asterias forbesi, Aphelasterias japonica, Distolasterias nipon, and Asterina pectinifera. Acrosome reaction assays indicate that the acrosome reaction can be induced across species within Asteriinae subfamily. However, cross-fertilization assays indicate that sea stars have species specificity in fertilization. Therefore, steps after the acrosome reaction are responsible for the species specificity. To explain acrosome reaction subfamily specificity at the molecular level, the sugar components of egg jelly were examined and analyzed by principal component analysis. A. amurensis and A. forbesi belong to the same induction group of the acrosome reaction. D. nipon and An. pectinifera are in a unique group. Enzyme-linked immunosorbent assays indicate that Asteriinae subfamily share a common glycan structure, the Fragment 1 of Acrosome Reaction-Inducing Substance from A. amurensis. Fragment 1 plays an important role in the subfamily specificity of acrosome reaction induction. In addition, A. amurensis sperm activating peptide was recognized by sperm from the same superorder. These results demonstrate that the specificity of acrosome reaction induction is present at the subfamily level in sea stars. (+info)Coelomocytes and post-traumatic response in the common sea star Asterias rubens. (4/14)
Coelomocytes are recognized as the main cellular component of the echinoderm immune system. They are the first line of defense and their number and type can vary dramatically during infections or following injury. Sea stars have been used as a model system to study the regeneration process after autotomy or predation. In the present study we examined the cellular and biochemical responses of coelomocytes from the European sea star Asterias rubens to traumatic stress using immunochemical and biochemical approaches. In terms of trauma and post-traumatic stress period, here we consider the experimental arm amputation and the repair phase involved in the first 24 hours post-amputation, which mimicked a natural predation event. Four cell morphotypes were distinguishable in the coelomic fluid of both control and post-traumatic-stressed animals (phagocytes, amoebocytes, vibratile cells, hemocytes), but phagocytes were the major components, accounting for about 95% of the total population. Thus, the effects measured relate to the overall population of coelomocytes. A modest increase in the total number of freely circulating coelomocytes was observed 6 hours post-amputation. Interestingly, a monoclonal antibody (McAb) to a sea urchin embryo adhesion protein (toposome) cross-reacted with isolated sea star coelomocytes and stained the coelomic epithelium of control animals with an increase in trauma-stressed arms. In addition, coelomocytes from trauma-stressed animals showed a time-dependent increase in Hsp70 levels, as detected by both immunocytochemistry and immunoblotting within 24 hours after arm tip amputation, with a peak at 6 hours after amputation. Our findings indicate a clear role for coelomocytes and classic stress molecules in the post-traumatic stress associated with the early repair phase of regeneration. (+info)Can salinity-induced mortality explain larval vertical distribution with respect to a halocline? (5/14)
For the larvae of two echinoderm species that coexist in Atlantic Canada (bipinnaria of the sea star Asterias rubens and 4- and 6-arm echinoplutei of the sea urchin Strongylocentrotus droebachiensis), we examined the effect of short- and long-term exposure to salinity (ranging from 18 to 35) on the probability of larval survival in laboratory experiments. We also related larval vertical distributions in response to sharp haloclines generated in the laboratory to survival probability in the salinity of different layers in the water column. For both species and developmental stages, survival probability decreased with decreasing salinity, and a salinity range of 24-27 emerged as the critical threshold for larval tolerance. The relationship between the proportion of larvae that crossed a halocline into the top water layer and the survival probability of larvae in the salinity of that layer was significant for both species. Interestingly, the shape of this response was species-specific but not stage-specific for S. droebachiensis. Our findings suggest that larval avoidance of low-salinity water layers may be an adaptive behavior that increases survival and indirectly influences larval distribution. (+info)Glycosylceramides obtain from the starfish Asterias amurensis Lutken. (6/14)
Complex lipids in the starfish Asterias amurensis were characterized and the influence of sphingoid bases on human colon carcinoma Caco-2 cells was also investigated. Lipid content of gonad and viscera were 3.3% and 6.8%, respectively, in wet basis. The main lipid class in gonad was ceramide monohexoside (CMH) while triglyceride (TG) was predominant in the viscera. The most abundant fatty acid in the polar lipid was eicosapentaenoic acid (EPA, C20:5n-3), with the gonad and viscera samples having the highest proportion of 41.5% and 32.7%, respectively, of total fatty acids. Starfish internal organ contained enormous amount (0.7% in wet base) of glycosylceramide. Sphingoid bases of the glycosylceramide were mainly consisted of d22:2, d22:1 and d18:3. This sphingoid base exerted an apoptotic activity on Caco-2 cells. Thus, starfish could be used as a potential source of precious and useful complex lipids. (+info)Induced cell proliferation in putative haematopoietic tissues of the sea star, Asterias rubens (L.). (7/14)
(+info)Kistimonas asteriae gen. nov., sp. nov., a gammaproteobacterium isolated from Asterias amurensis. (8/14)
(+info)"Asterias" is a genus of starfish belonging to the family Asteriidae. The name "Asterias" itself does not have a specific medical definition, as it is a term used in the field of marine biology. However, some species of starfish in this genus may have potential medicinal or toxicological significance. For example, the venom of some asteriid starfish has been studied for its potential therapeutic applications, while others may contain toxins that can cause harm if ingested or come into contact with human skin.
It's worth noting that while some species of starfish may have medical relevance, the term "Asterias" does not have a direct medical definition and is not commonly used in medical contexts.
I believe you may be mistakenly using the term "starfish" to refer to a medical condition. If so, the correct term is likely " asterixis," which is a medical sign characterized by rapid, rhythmic flapping or tremulous movements of the hands when they are extended and the wrist is dorsiflexed (held with the back of the hand facing upwards). This is often seen in people with certain neurological conditions such as liver failure or certain types of poisoning.
However, if you are indeed referring to the marine animal commonly known as a "starfish," there isn't a specific medical definition for it. Starfish, also known as sea stars, are marine animals belonging to the class Asteroidea in the phylum Echinodermata. They have a distinctive shape with five or more arms radiating from a central disc, and they move slowly along the ocean floor using their tube feet. Some species of starfish have the ability to regenerate lost body parts, including entire limbs or even their central disc.
Echinodermata is a phylum in the animal kingdom that includes various marine organisms such as sea stars, sea urchins, sand dollars, brittle stars, and sea cucumbers. The name Echinodermata comes from the Greek words "echinos," meaning spiny, and "derma," meaning skin, which refers to the characteristic spiny skin of many echinoderms.
Echinoderms are bilaterally symmetrical as larvae but become radially symmetrical as adults, with their bodies organized around a central axis. They have a unique water vascular system that helps them move and respire, and most species have specialized structures called pedicellariae that help them clean and defend themselves.
Echinoderms are also known for their ability to regenerate lost body parts, and some species can even undergo asexual reproduction through fragmentation. They play important ecological roles in marine ecosystems, including grazing on algae and other organisms, breaking down organic matter, and serving as prey for larger animals.
Cerebrosides are a type of sphingolipid, which are lipids that contain sphingosine. They are major components of the outer layer of cell membranes and are particularly abundant in the nervous system. Cerebrosides are composed of a ceramide molecule (a fatty acid attached to sphingosine) and a sugar molecule, usually either glucose or galactose.
Glycosphingolipids that contain a ceramide with a single sugar residue are called cerebrosides. Those that contain more complex oligosaccharide chains are called gangliosides. Cerebrosides play important roles in cell recognition, signal transduction, and cell adhesion.
Abnormalities in the metabolism of cerebrosides can lead to various genetic disorders, such as Gaucher's disease, Krabbe disease, and Fabry disease. These conditions are characterized by the accumulation of cerebrosides or their breakdown products in various tissues, leading to progressive damage and dysfunction.
Asterias
Asterias rathbuni
Asterias amurensis
Asterias microdiscus
Asterias forbesi
Asterias argonauta
Tisis asterias
Asterias versicolor
Hednota asterias
Astrophytum asterias
Myloplus asterias
Asteranthe asterias
Asterias solaris
Glyphipterix asterias
Asterias rollestoni
Astropecten articulatus
Northern Pacific seastar in Australia
Echinoderm
Starry smooth-hound
Starfish
Spinal cord injury research
Marine invertebrates
Spotted handfish
Handfish
Hermann Fol
Vermes in the 10th edition of Systema Naturae
River Derwent (Tasmania)
California Institute for Regenerative Medicine
Echinocactus
Starfish Foundation
Asterias - Wikipedia
Common starfish (Asterias rubens) - MarLIN - The Marine Life Information Network
Astrophytum Asterias Cactus With A Yellow With Red Bases Flower Potted In A Beautiful Decorative Ceramic Planter Isolated...
Molecular responses as indicators of marine pollution: DNA damage and enzyme induction in Limanda limanda and Asterias rubens.
ASTERIAS EAR CUFF (129) - Shopicelandic
DailyMed - PROSTATE LIQUESCENCE- sabal serrulata, taraxacum officinale, phytolacca decandra, thuja occidentalis, estradiol,...
DailyMed - SHINGLES- chamomilla, echinacea, apis mellifica, arsenicum album, asterias rubens, cantharis, cistus canadensis,...
top view of astrophytum asterias cactus on planting pot Stock Photo | Adobe Stock
MedlinePlus - Search Results for: ARSENIC CATION 3 OR ASTERIAS RUBENS OR CONIUM MACULATUM FLOWERING TOP OR ELYMUS REPENS ROOT...
Storage and depletion of lipid components in the pyloric caeca and ovaries of the seastar Asterias rubens during its annual...
Superior Δωμάτια - Asterias Village Resort
Cohilia Pool Bar - Asterias Village Resort
Children's Courses : Asterias 2: Modern Greek for Children (Αστερίας 2: Νέα Ελληνικά Για Παιδιά )
Mustelus asterias
Zoya - Asterias
lbadmin - Asterias Hotel
Bitter Cocoa - Asterias
Family - Asterias Hotel
ASTERIAS BEACH HOTEL
Astrophytum asterias - Kyle's Plants
asterias Archives - PuertoRico Plants
Careers at Asterias Biotherapeutics
ADW: Asterias forbesi: PICTURES
ASTERIAS HOTEL (3) | Drakos Travel
Villa Asterias - Alonissos Villas Holidays
Astrophytum asterias cv. Nisiki (yellow)
Asterias Hat S22P1255 - Querida Costa,
Astrophytum asterias cv. Shinshowa Red
Rubens6
- It includes several of the best-known species of sea stars, including the (Atlantic) common starfish, Asterias rubens, and the northern Pacific seastar, Asterias amurensis. (wikipedia.org)
- The genus Asterias was first described by Carl Linnaeus in the 10th edition of Systema Naturae in 1758 when he published A. rubens. (wikipedia.org)
- Below are the main rubriks (i.e strongest indications or symptoms) of Asterias Rubens in traditional homeopathic usage , not approved by the FDA. (abchomeopathy.com)
- The common starfish or common sea star ( Asterias rubens ) is the most common and familiar starfish in the north-east Atlantic. (nutrawiki.org)
- One species, Asterias rubens, is the most common in the north-east Atlantic region. (lookformedical.com)
- Six species of sea stars were used in this study: Asterias amurensis, Asterias rubens, Asterias forbesi, Aphelasterias japonica, Distolasterias nipon, and Asterina pectinifera. (lookformedical.com)
Astrophytum6
- Astrophytum asterias cv. (llifle.com)
- Astrophytum asterias (Zucc. (llifle.com)
- Astrophytum asterias var. (llifle.com)
- This form has a very characteristic glabrous stem lacking the white tufts of loose hairy scales typical of the common Astrophytum asterias . (llifle.com)
- This form varies from the typical Astrophytum asterias for the tendency to branch forming small side pups from the areole. (llifle.com)
- Star Cactus ( Astrophytum asterias) is an Endangered plant and part of the Threatened Texas series and is an archival print of original artwork by me, Juliet Whitsett. (giddyupartstudio.com)
Amurensis3
- Asterias amurensis is an invasive species in Australia and can in some years become a pest in the Japanese mariculture industry. (wikipedia.org)
- We identified the peptide asterosap as a chemotactic factor of the starfish Asterias amurensis. (lookformedical.com)
- Extraction, Characterization and Osteogenic Activity of a Type I Collagen from Starfish ( Asterias amurensis ). (bvsalud.org)
Sani Asterias5
- Positioned along a tranquil beachfront in Halkidiki, the five-star Sani Asterias is an intimate boutique-style hotel that appeals to discerning travellers with its 52 Residences, attentive staff, exclusive sandy beach and exceptional waterside restaurant - with a menu by a two Michelin-starred chef. (britishairways.com)
- Sani Asterias is situated in Halkidiki, one of the most popular holiday destinations in northern Greece. (britishairways.com)
- All Residences at Sani Asterias include the additional benefits of the Sani Suite Collection. (britishairways.com)
- Exceptionally spacious ground floor Sani Asterias Suite with separate sitting room, and own private garden, offering magnificent views of the Sani Marina or the Aegean. (amathusholidays.co.uk)
- Those situated at the beach front offer direct access to the Sani Asterias beach. (amathusholidays.co.uk)
Starfish asterias2
- Red Starfish, Asterias, Aster. (abchomeopathy.com)
- Starfish-Asterias is an internationally recognised NGO, registered in Greece. (asterias-starfish.org)
Genus4
- Asterias is a genus of the Asteriidae family of sea stars. (wikipedia.org)
- He split the genus into at least six subgenera, of which subgenus Asterias, section β of the Pentactinid (5-armed) section contained at least four species, three of which are still accepted in the genus today. (wikipedia.org)
- In the early 1900s Addison Emery Verrill, working on the east coast of the US, added a number of new species to the genus, none of which are still in Asterias, and split the genus into numerous new genera and created new genera, moving almost all of the species now recognised as belonging to Asterias to his new genus of Allasterias. (wikipedia.org)
- Soon after, and in the following two decades, Walter Kenrick Fisher, working in California, synonymised or removed all of Verrill's species of Asterias, and synonymised Verrill's new genera of Allasterias and Parasterias with Asterias, leaving the genus with four species, all of which are still recognised today. (wikipedia.org)
Biotherapeutics5
- AST: Message Board for Asterias Biotherapeutics, Inc. (investorvillage.com)
- Asterias Biotherapeutics, Inc. (investorvillage.com)
- Asterias Biotherapeutics, Inc., a clinical-stage biotechnology company, focuses on developing cell-based therapeutics to treat neurological conditions associated with demyelination, and cellular immunotherapies to treat cancer. (marketbeat.com)
- The company was formerly known as BioTime Acquisition Corporation and changed its name to Asterias Biotherapeutics, Inc. in March 2013. (marketbeat.com)
- Asterias Biotherapeutics, Inc. was founded in 2012 and is headquartered in Fremont, California. (marketbeat.com)
Cactus1
- Asterias, a cactus that grows in the mountainous regions of Mexico, lends its name to this new design from Patricia Urquiola. (cvconcept.com)
Dispune1
- Vila Memento Asterias are 3 etaje și dispune de 16 camere. (aventouratravel.ro)
Descriere1
- Descriere ASTERIAS BEACH: hotel reamenajat recent, situat intr-o zona linistita din Aiya Napa, la marginea rezervatiei naturale St Nikandros, pe plaja. (geea.ro)
Village Resort2
- Τα στούντιο του Asterias Village Resort διαθέτουν ένα μεγάλο διπλό κρεβάτι ή δύο μονά κρεβάτια συν ένα επιπλέον μονό κρεβάτι και επομένως μπορούν να φιλοξενήσουν έως και 3 άτομα. (asteriasvillage.gr)
- Στο Asterias Village Resort, το καλό φαγητό είναι προτεραιότητα. (asteriasvillage.gr)
Hotel1
- Asterias Beach Hotel is situated in a quiet location in Ayia Napa, walking distance from local bars and restaurants. (spahotels-cyprus.com)
Beach3
- Vila Memento Asterias este situată la 80 m de plajă, în imediata apropiere a centrului stațiunii Olympic Beach. (aventouratravel.ro)
- Localizare ASTERIAS BEACH: situat la 2 minute plimbare de Makronissos Bay, la plimbare distanta de restaurante, baruri, magazine si la 30 de minute transfer de Aeroportul Larnaca. (geea.ro)
- Asterias Beach has a wellness centre including sauna, hot tub, steam bath and massage facilities. (spahotels-cyprus.com)
Products3
- The company Asterias invitations with headquarters at Agios Dimitrios operates in the design, production and distribution of specialized graphic arts products. (expobrideline.com)
- During the 1990s, Asterias invitations was developed even more by expanding its original range of products and penetrating in new fields such as paper trade, luxury boxes, various accessories from paper and wedding sets with an emphasis on the design and the excellent quality of the raw material. (expobrideline.com)
- Asterias' invitations products are designed according to market requirements, combining originality with design and the highest-quality raw materials. (expobrideline.com)
Star1
- Introduce your students to the space story Asterias , which tells about a little sea star lost in the solar system. (espacepourlavie.ca)
Group1
- If a project for Asterias Project is not listed here, get in touch with Ramon Diaz-Uriarte who is the administrator for the project group. (launchpad.net)
Story1
- The story of Asterias. (aurumiceland.com)
Starfish1
- Asterias, like most starfish genera in the order Forcipulatida, are recognisable externally by their pedicellariae, many thousands of tiny jaw-like structures on the skin which can snap shut to nip at prey or predators. (wikipedia.org)
Species5
- Asterias amurensis is an invasive species in Australia and can in some years become a pest in the Japanese mariculture industry. (wikipedia.org)
- None of these species are accepted or recognised as Asterias today. (wikipedia.org)
- William Stimpson rejected Müller and Troschel's Asteracanthion in a paper presented on 4 December 1861, and named 16 new species, none of which are retained or included in Asterias at present. (wikipedia.org)
- He accepted six species for the Pacific coasts of North America, none of which remain in Asterias at present. (wikipedia.org)
- Species: Silene asterias. (amazonaws.com)
Kabuto1
- synonyms Syowa or Shinshowa kabuto ) is a classic asterias with very fine petals, cut into shreds. (llifle.com)
20211
- 2021 Asterias, All Rights Reserved. (asteriasbeaute.com)
Echinocactus1
- Echinocactus asterias Zucc. (llifle.com)
Varies1
- This cultivar varies from the typical A. asterias for the white flecks that condense, forming characteristic cloud-like patches. (llifle.com)
Hotel1
- Descriere ASTERIAS BEACH: hotel reamenajat recent, situat intr-o zona linistita din Aiya Napa, la marginea rezervatiei naturale St Nikandros, pe plaja. (sfaratoursbistrita.ro)
Sale1
- Asterias.com domain name is for sale. (asterias.com)
Terms1
- By signing up, you accept the terms of Asterias Beaute's Privacy Policy . (asteriasbeaute.com)
View1
- The 3 main bedrooms, all with frontal sea view, king size bed and en-suite shower or bath & toilet, are generously sized. (alonissosvillas.gr)
Types1
- Asterias has two types present -the major, also called straight, pedicellaria, which lie scattered across their skin, and the smaller minor, also called crossed, pedicellaria, which are found in tufts or wreaths around the large dorsal spines -these pedicellariae have tiny, rubbery stalks known as pedicels. (wikipedia.org)
Product1
- Be the first to know about product launches, events, tutorials and all things Asterias. (asteriasbeaute.com)