Results 91 to 100 of about 1,447,789 (299)

The evolutionary modifications of a GoLoco motif in the AGS protein facilitate micromere formation in the sea urchin embryo

eLife
The evolutionary introduction of asymmetric cell division (ACD) into the developmental program facilitates the formation of a new cell type, contributing to developmental diversity and, eventually, species diversification. The micromere of the sea urchin
Natsuko Emura, Florence DM Wavreil, Annaliese Fries, Mamiko Yajima   +3 more
doaj   +1 more source

Species and Abundance of Sea Urchins (Diadematidae) on Different Environmental Pressure Conditions

Journal of Tropical Life Science, 2017
Genetic diversity of sea urchin are very high; there are no two organisms of the same species that are exactly alike. Dense aggregation of sea urchin is responsible for the destruction of marine algae communities on coral reef ecosystem.
Pratama Diffi Samuel, Dewa Gede Raka, Bagyo Yanuwiyadi   +2 more
doaj   +1 more source

Density and Distribution Pattern of Sea Urchin Population (Diadema Setosum) on Coral Reef (Reef Flat) at Setan Island [PDF]

, 2014
Density and distribution population of sea urchin Diadema setosum was conducted in May 2014 at Setan Island. The research aimed to know about its density and distribution pattern. The study used survey method by applying transect and plot.
Nasution, S. (Syafruddin), Silalahi, S. (Steven), Thamrin, T. (Thamrin)   +2 more
core  

Calpain Proteases and the Evolving Signaling Network in Insect Embryonic Patterning

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, EarlyView.
Insect embryonic Dorsal‐Ventral (DV) patterning relies on the BMP and Toll pathways to different extents. Calcium‐dependent cystein proteases of the Calpain family also exert an important function to pattern the DV axis. In Drosophila, Calpain A cleaves the Cactus/IkappaB inhibitor and modifies Toll signals in ventral regions of the embryo. In Rhodnius
Alison Julio, Helena Araujo
wiley   +1 more source

MICROPAPILLAE IN SEA URCHIN EGGS* [PDF]

Development, Growth and Differentiation, 1976
Sea urchin eggs fixed in a glutaraldehyde-calcium chloride mixture have "micropapillae" with a dense content. If these structures are real, they are likely to be sites where a fusion with the spermatozoon can take place. It is possible however that they represent some kind of preparation artefact without a structural counterpart in the living state.
openaire   +2 more sources

Influence of Sea Surface Temperature on the Gonadal development of Sea urchin Temnopleurus toreumaticus from the Gulf of Mannar, South East Coast of India [PDF]

, 2016
This study was conducted for a 20 months period from October 2013 to May 2015 in Gulf of Mannar, south east coast of India. During the investigation the abiotic factors viz., Sea surface temperature (SST), Daylight photoperiod and atmospheric temperature
Ahilan, B, Francis, T, Paulraj, J, Rajagopal, S, Saravanan, Raju   +4 more
core  

Reconstructing Early Human Subsistence in Near Oceania: New Insights From Matenkupkum and Matenbek

International Journal of Osteoarchaeology, EarlyView.
ABSTRACT The colonization of New Ireland ~44–40,000 years ago represents the earliest evidence of human occupation in Near Oceania. Yet, the precise impacts of climatic changes on subsistence strategies during the Late Pleistocene, Last Glacial Maximum, and Holocene remain poorly understood.
Joëlle den Toom, Glenn Summerhayes, Anne Ford, Karen Greig   +3 more
wiley   +1 more source

Benthic megafauna and the functioning of macroalgal forests and urchin barrens

Oikos, EarlyView.
Two temperate rocky reef food‐web models, representing the trophic diversity of the Mediterranean rocky reef communities, were built for the two stable states: macroalgal forests and barren grounds, which are characterized by opposite amounts of erect macroalgal biomass.
Chiara Bonaviri, Davide Agnetta, Stefania Pinna, Luigi Piazzi, Fabio Badalamenti, Giulia Ceccherelli, Davide Iaciofano, Manfredi Di Lorenzo, Francesco Di Trapani, Sabrina Lo Brutto, Vesna Mačić, Anna Maria Mannino, Francesco Mura, Luigi Musco, Laura Tamburello, Tomás Vega Fernández, Salvatrice Vizzini, Trevor Willis, Paola Gianguzza   +18 more
wiley   +1 more source

Micromechanics of Sea Urchin Spines

PLoS ONE, 2012
The endoskeletal structure of the Sea Urchin, Centrostephanus rodgersii, has numerous long spines whose known functions include locomotion, sensing, and protection against predators. These spines have a remarkable internal microstructure and are made of single-crystal calcite.
Tsafnat, Naomi, Fitz Gerald, John D., Le, Hai N., Stachurski, Zbigniew H.   +3 more
openaire   +5 more sources

Hindgut specification and cell-adhesion functions of Sphox11/13b in the endoderm of the sea urchin embryo [PDF]

, 2006
Sphox11/13b is one of the two hox genes of Strongylocentrotus purpuratus expressed in the embryo. Its dynamic pattern of expression begins during gastrulation, when the transcripts are transiently located in a ring of cells at the edge of the ...
Arenas-Mena, César, Cameron, R. Andrew, Davidson, Eric H.   +2 more
core   +1 more source