
	Where results make sense

Topic: Sea urchin

Related Topics

Echinoidea

Urchin

Sand dollar

Sea cucumber

Holothuroidea

Echinoderm

Echinarachnius parma

Echinodermata

Model organism

Karasumi

Uni

Hedgehog

Musci

Embryogenesis

In the News (Tue 10 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Sea Urchin - MSN Encarta
		Sea Urchin, common name for approximately 700 species of echinoderms having rigid, spherical shells, or tests, made up of closely fitting bony plates.
		Sea urchins also have a complicated chewing apparatus called Aristotle's lantern, consisting of five converging jaws and accessory bony plates.
		Sea urchins feed on various types of organic matter, including plants, small animals, and waste material.
	encarta.msn.com /encyclopedia_761560371/Sea_Urchin.html (208 words)

	Sea Urchin Genome Project (Site not responding. Last check: 2007-10-12)
		Sea urchin embryos offer unparalleled advantages for the study of structure and function of cis-regulatory systems, for transcription factor isolation, and for exploration of gene networks, due to their biological characteristics and recent technological developments.
		Sea urchins occupy a unique position in animal evolution because they are the only invertebrate, non-chordate deuterostome for which extensive molecular information exists and they therefore provide an invaluable out-group for studies of chordate gene evolution.
		Sea urchins are the only invertebrate marine organism for which the genomic and molecular basis of adaptations required for existence in the marine environment are likely to be accessible in the near future.
	sugp.caltech.edu /intro (466 words)

	sea urchin - HighBeam Encyclopedia
		Sea urchins feed on all kinds of plant and animal material; some eat sand or mud, digesting out organic material that is present.
		Sea urchins are classified in the phylum Echinodermata, class Echinoidea, subclass Regularia.
		Fisherman's new friend; The humble sea urchin is poised to become a lucrative seafood export.
	www.encyclopedia.com /doc/1E1-seaurchi.html (609 words)

	Ecology of the Not-So-Lowly Green Sea Urchin
		On the east coast of Nova Scotia, the green sea urchin is the dominant grazer of seaweeds or macroalgae in rocky subtidal environments.
		This widespread die-off of sea urchins was a result of a pathogenic amoeba which appears to be associated with unusually high seawater temperatures in the late summer or early autumn.
		By the early 1990's, dense populations of sea urchins had re-occupied the shallow subtidal zone along much of the coast - presumably due to migration of adult sea urchins from deeper water which serves as a thermal refuge from the disease - and kelp beds were once again on the decline.
	www.elements.nb.ca /theme/wildlife/chris/chris.htm (1336 words)

	Underwater World - Red Sea Urchin
		Red sea urchins (Strongylocentrotus franciscanus) are colourful creatures, varying between a uniform red and dark burgundy, that crawl slowly over the sea bottom, using their spines as stilts.
		Sea urchins are readily eaten by some sea stars and crabs, although large adults appear to be less susceptible to predation by virtue of their size, and have few predators.
		Sea urchin fishermen are required as a condition of their licence to provide fishery-based catch, effort and location information through a mandatory submission to their fishing logbooks.
	www.dfo-mpo.gc.ca /zone/underwater_sous-marin/red_sea_urchin/urchin_oursin_e.htm (1016 words)

	The Sea Urchin EXTRAVAGANZA!
		At the center of the test of the sea urchin, there is the anus, the five gonopores, and the madreporite which is used to maintain correct water pressure in the vascular system that pressurizes the tube feet.
		Sea urchins also inhabit dense mats of coralline algae, which is common in the shallow sublittoral of certain areas, because they have consumed all the fleshy algae, leaving the harder material behind (Kenner 1992).
		Fertilization is the fundamental process of life and the fertilization of sea urchins serves as a good example for the fertilization of almost all organisms.
	www.geocities.com /thepoetdog (6372 words)

	sea urchin (Site not responding. Last check: 2007-10-12)
		Sea urchins are assigned to the subclass Regularia or Endocyclica.
		Sea urchins are classified into six families based on the sculpturing and details of their test, and the details of their pedicellariae.
		White urchins require some wave action and are limited in distribution by the degree of flushing in the immediate proximity of their teat and spires.
	biology.fullerton.edu /courses/biol_317/web/Murray/Fall97/sea_urchin.html (1816 words)

	Sea Urchin Embryology
		True sea urchins are radially symmetrical as adults although they are bilaterally symmetrical in the larval stage.
		The purpose of this lab is to observe and record the differences in the sea urchin gametes (sperm and egg); the changes that occur during and shortly after fertilization; and the changes that occur in the developing embryo over a period of several hours and days.
		Sea water should be removed with a pipette and replaced with new sea water.
	www.accessexcellence.org /AE/AEPC/WWC/1994/sea_urchin_embryology.html (2964 words)

	SEA URCHIN TRADE
		The increased demand in sea urchins, whose roe is a Japanese sushi ingredient, is causing the problem of overfishing in California.
		Sea urchin fisheries started in the States in 1971 with a federal program to foster them, but the business became more and more profitable recently as the yen began to rise against the dollar.
		Sea urchins are thought to be possibly raised the latter way with a successful catch rate, since they are largely stationary.
	www.american.edu /TED/URCHIN.HTM (2704 words)

	11-04-03 RED SEA URCHINS DISCOVERED TO BE ONE OF EARTH'S OLDEST ANIMALS
		The red sea urchin appears to be one of the longest living animals on Earth, with a possible lifespan of up to 200 years, according to a new study by marine zoologists at Oregon State University.
		The more mature red sea urchins, in fact, appear to be the most prolific producers of sperm and eggs, and are perfectly capable of breeding even when incredibly old.
		Older sea urchins can help provide more young and therefore may play a key role in creating a sustainable fishery, so a return to harvest policies that limits harvest above a certain size might be prudent, the researchers said.
	oregonstate.edu /dept/ncs/newsarch/2003/Nov03/urchin.htm (1038 words)

	SUE - ANATOMY & PHYSIOLOGY
		Sea urchins are unsegmented and penta-radial as adults.
		Sea urchins have no "brain" as we think of it, instead they have a nerve ring near the hydraulic system used to power the tube feet.
		The tube feet are the primary means of locomotion for the sea urchin (along with moving the spines).
	www.stanford.edu /group/Urchin/anaphys.html (336 words)

	Sea urchin
		Sea urchins live in the mid-level or low-level of a tide pool.
		Sea urchins use these teeth to pull, tear and rip off algae on the rocks.These teeth continue to grow throughout the sea urchin's life.
		A sea urchin's size is about 4 inches and they come in many different colors.
	library.thinkquest.org /J001418/urchin.html (189 words)

	Sea Urchin - Distributed Manipulation
		Sea urchins have an uncanny knack of choosing to roost in exactly the place you need to put a hand or foot when clambering in or out of the water.
		A sea urchin or a starfish is a democracy (the older textbooks talk of a "republic of reflexes") and it works.
		Maoist animals, as indestructible as China, starfish and sea urchins are very common creatures and have been doing very nicely since long before the dinosaurs and certainly for millions of years before the newfangled mammals began to gather illusions about which of us is actually running this planet.
	www.cs.dartmouth.edu /~brd/Research/urchin.html (612 words)

	Echinoderms (starfish, brittle star, sea urchin, feather star, sea cucumber)
		Sea stars are characterized by radial symmetry, several arms (5 or multiplied by 5) radiating from a central body.
		There are two specialized types of sea urchins with an unusual appearance: the sand dollar is very much flattened with very small spines and the heart urchin which are oval and have bristle like spines.
		Sea cucumbers move by means of tube feet which extend in rows from the underside of the body.
	www.starfish.ch /reef/echinoderms.html (2461 words)

	Sea Otters
		Sea otters are the smallest of all marine mammals.
		Sea otters have a strong influence on coastal ecosystems.
		They restrict the sea urchin populations in near-shore habitats, allowing kelp forests to flourish (sea urchins graze heavily on kelp).
	www.hsus.org /marine_mammals/a_closer_look_at_marine_mammals/sea_otters.html (308 words)

	The sea urchin, an amazing animal
		The weather is nice, the sea water is warm, you are going to walk along the seashore, among wave foam which is reaching the beach and refreshing your feet....
		Gastronomic note: in the French Riviera mainly, sea urchins are greatly appreciated by gourmets who cut urchins in two halves and eat the roes.
		Like many marine animals, sea urchins produce a great number of eggs, which are carried away by currents and only few of them become adults.
	www.microscopy-uk.org.uk /mag/artjul00/urchin1.html (752 words)

	Sea Urchin Genome Project
		The HGSC is sequencing the genome of the California Purple Sea Urchin (Strongylocentrotus purpuratus) and portions of the genome of the Green Sea Urchin (Lytechinus variegatus) for comparative analysis.
		The sea urchin occupies an important evolutionary position with respect to vertebrates and humans.
		There is a large body of information about gene expression in the sea urchin and there are a number of genomic resources available, making the sea urchin an ideal organism for learning how pathways of genes and proteins regulate growth and development, with potentially profound implications for understanding human biology.
	www.hgsc.bcm.tmc.edu /projects/seaurchin (337 words)

	Sea Urchin- Enchanted Learning Software
		The sea urchin is a spiny, hard-shelled animal that lives on the rocky seafloor, from shallow waters to great depths.
		Sea urchins have a globular body and long spines that radiate from the body.
		Predators of Sea Urchins: Sea urchins are eaten by crabs, sunflower stars, snails, sea otters, some birds, fish (including wolf eels), and people.
	www.enchantedlearning.com /subjects/invertebrates/echinoderm/Seaurchin.shtml (376 words)

	National Sea Grant Office: News & Events-Farming Sea Urchins
		Feeding over 800 urchins individually, and working 12-hour days, seven days a week, researchers have developed semi-purified and purified dry feeds that promote high rates of growth and survivorship of sea urchins in the laboratory at levels that exceed field populations.
		The promise of sea urchin farming would not only help to alleviate the over-fished sea urchin population and bolster the seafood industry, but has important biomedical applications and the ability for global economic impact.
		Since sea urchins are also of major economic importance in many other regions of the world, interest in their management, as well as the ability to grow them, has increased greatly in recent years.
	www.seagrant.noaa.gov /newsevents/stories/seaurchins.htm (505 words)

	Introduction to Sea Urchins (Site not responding. Last check: 2007-10-12)
		Sea urchins are a useful model system for studying many problems in early development.
		Historically, sea urchins were a key model system in elucidating a variety of classic developmental problems, including the mechanisms of fertilization and egg activation, cleavage, gastrulation, and the regulation of differentiation in the early embryo.
		In addition, the early development of sea urchin embryos is highly synchronous, i.e., when a batch of eggs is fertilized, all of the resulting embryos typically develop on the same time course.
	worms.zoology.wisc.edu /urchins/SUIntro.html (152 words)

	sea urchins
		Urchin health and urchin diseases are neither well understood nor well defined in the scientific literature, particularly in light of the possibility of significant regional differences.
		Sea urchins are the dominant grazer in coastal zones of the Gulf of Maine.
		The green urchin has well developed gonads by the time it is 25 mm in diameter, thought studies have shown that the larger a sea urchin is, the greater its reproductive potential.
	www.state.me.us /dmr/research/sea_urchins.htm (7474 words)

	BBC NEWS \| Science/Nature \| Red sea urchin 'almost immortal'
		The red sea urchin found in the shallow waters of the Pacific Ocean is one of the Earth's longest-living animals.
		The latest work on sea urchin growth rates uses measures of the isotope carbon-14, which has increased in all living organisms following the atmospheric testing of atomic weapons in the 1950s.
		In fact, the indications are that the more mature red sea urchins are the most prolific producers of sperm and eggs, and are perfectly capable of breeding even when incredibly old.
	news.bbc.co.uk /2/hi/science/nature/3232002.stm (480 words)

	Red Sea Urchin: BC Seafood Online (Site not responding. Last check: 2007-10-12)
		Harvest Method: Red sea urchin is hand picked by divers who use hand rakes made of stainless steel to pick the sea urchin off the rocks.
		They then transfer the sea urchin into a harvest bag which is hauled to the surface when full to be tagged and stored.
		The first landings of red sea urchins in BC were recorded in 1978 and the fishery today “uni” is considered a seafood delicacy referred to as the “ocean viagra”.
	www.bcseafoodonline.com /files/red_sea_urchin.html (703 words)

	California Sea Urchin Fishery Newsletter
		The existing procedure for issuing new permits via a random drawing among qualified sea urchin crewmember permittees, was modified to give greater opportunity for obtaining a permit to those crewmembers that have been active in the fishery for a longer period of time.
		Also, the due date for sea urchin fishing activity records was modified from the fifth day of the month to the tenth day in order to make this regulation consistent with Section 190 and with other fisheries.
		The number of sea urchin boats with at least one landing was 207 in 2002, down from 228 in 2001.
	www.dfg.ca.gov /Mrd/seaurchin/su_news_1103.html (799 words)

	Green Sea Urchin Gametogenesis
		It is important to recognize that the size of sea urchin gonads does not necessarily relate to the progress of gametogenesis alone.
		Byrne M (1990) Annual reproductive cycles of the commercial sea urchin Paracentrotus lividus from an exposed intertidal and a sheltered habitat on the west coast of Ireland.
		Kobayashi N, Konaka K (1971) Studies on periodicity of oogenesis of sea urchin I. Relation between the oogenesis and the appearance and disappearance of nutritive phagocytes detected by some histological means.
	zoology.unh.edu /faculty/walker/urchin/gametogenesis.html (678 words)

	The Sea Urchin Gene Catalogue
		The sea urchin system is currently one of the leading models for the generation of GRNs of whole animal development.
		One particular focus in the lab is the generation and analysis of the GRNs responsible for sea urchin Oral-Aboral axis specification, a process comparable to dorso-ventral axis specification in vertebrate embryos and the GRN for neurogenesis.
		Sea Urchin Clones and filters as well as all public Sea Uchin EST Data are available via the Primary Database of the Resource center (RZPD) of the German Human Genome Project and are continually updated.
	www.molgen.mpg.de /~ag_seaurchin (409 words)

	Sea Urchin Model (Site not responding. Last check: 2007-10-12)
		In the last fifteen years, a fishery for the green sea urchin, Strongylocentrotus droebachiensis,has become the seventh largest in the Northeastern United States, and is the third largest in Maine behind lobsters and aquacultured Atlantic salmon (NOAA NR96-11, September, 17, 1996).
		Unsexed whole sea urchins or their processed gonads are shipped primarily to Japanese markets and to markets in France, Belgium, Greece, Italy and Turkey.
		Various mechanisms for sea urchin aquaculture and stock enhancement have been identified and may provide high quality and high dollar value products in the absence of large annual harvests from natural populations.
	zoology.unh.edu /faculty/walker/urchin.html (273 words)

Try your search on: Qwika (all wikis)