Results 51 to 60 of about 1,420,649 (295)

Poster: The Sea Urchin [PDF]

open access: yesScience, 2006
The announcement of the sequencing of the genome of the sea urchin Strongylocentrotus purpuratus is the latest glowing chapter in the long history of contributions from sea urchin researchers to fundamental principles of cell biology, developmental biology, and gene regulation.
openaire   +2 more sources

Eutacticity in Sea Urchin Evolution [PDF]

open access: yesBulletin of Mathematical Biology, 2007
An eutactic star, in a n-dimensional space, is a set of N vectors which can be viewed as the projection of N orthogonal vectors in a N-dimensional space. By adequately associating a star of vectors to a particular sea urchin we propose that a measure of the eutacticity of the star constitutes a measure of the regularity of the sea urchin. Then we study
López-Sauceda, J., Aragón, J. L.
openaire   +3 more sources

Sea Urchin (Echinoidea) Distribution and Abundance in the Intertidal Zone of Bengkayang Regency

open access: yesBiosaintifika: Journal of Biology & Biology Education, 2018
Sea urchins is the member of Echinoidea. This species can be found in tropical marine water to the poles. The study aimed to know the types, the abundance and spread of sea urchins in Bengkayang Regency. The research, used the transect method.
Andi Ristanto   +2 more
doaj   +1 more source

Sea urchins mediate the availability of kelp detritus to benthic consumers

open access: yesProceedings of the Royal Society B, 2019
Detritus can fundamentally shape and sustain food webs, and shredders can facilitate its availability. Most of the biomass of the highly productive giant kelp, Macrocystis pyrifera, becomes detritus that is exported or falls to the seafloor as litter. We
Christie E. Yorke   +2 more
semanticscholar   +1 more source

How to generate pentagonal symmetry using Turing systems [PDF]

open access: yes, 2002
We explore numerically the formation of Turing patterns in a confined circular domain with small aspect ratio. Our results show that stable fivefold patterns are formed over a well defined range of disk sizes, offering a possible mechanism for inducing ...
Aragón, J. L.   +4 more
core   +2 more sources

Density-dependent feedbacks, hysteresis, and demography of overgrazing sea urchins.

open access: yesEcology, 2019
Sea urchin grazing can result in regime shift from productive kelp beds to sea urchin barren grounds that represent an alternative and stable reef state.
Scott D. Ling   +3 more
semanticscholar   +1 more source

Comparative Raman spectroscopy study of the coelomic fluid of grazing sea urchins and their native seawater: prospect for a potential indicator of environmental aggression [PDF]

open access: yesAerul şi Apa: Componente ale Mediului, 2018
Sea urchins have limited ability to move, and they use the watervascular circulation system to pump surrounding sea water in order to set body parts in motion.
F. NEKVAPIL   +2 more
doaj   +1 more source

Effects of eliminating interactions in multi-layer culture on survival, food utilization and growth of small sea urchins Strongylocentrotus intermedius at high temperatures

open access: yesScientific Reports, 2021
Poor growth and disease transmission of small sea urchins Strongylocentrotus intermedius in summer greatly hamper the production efficiency of the longline culture.
Fangyuan Hu   +9 more
doaj   +1 more source

The challenge of managing the commercial harvesting of the sea urchin Paracentrotus lividus: advanced approaches are required [PDF]

open access: yesPeerJ, 2020
Sea urchins act as a keystone herbivore in marine coastal ecosystems, regulating macrophyte density, which offers refuge for multiple species. In the Mediterranean Sea, both the sea urchin Paracentrotus lividus and fish preying on it are highly valuable ...
Simone Farina   +11 more
doaj   +2 more sources

The Protein Precursors of Peptides That Affect the Mechanics of Connective Tissue and/or Muscle in the Echinoderm Apostichopus japonicus [PDF]

open access: yes, 2012
PMCID: PMC3432112This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are ...
Maurice R. Elphick, Paul H. Taghert
core   +3 more sources

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