scholarly journals Stomach Contents of the Sea Urchins, Anthocidaris crassispina and Hemicentrotus pulcherrimus and Characterization of the Marine Algal Community along the Tongyeong Coast of Korea

2012 ◽  
Vol 45 (6) ◽  
pp. 686-693 ◽  
Author(s):  
Nam-Gil Kim ◽  
Jae-Gil Jang
Keyword(s):  
Sea Urchins ◽  
Stomach Contents ◽  
Algal Community ◽  
Marine Algal ◽  
Hemicentrotus Pulcherrimus ◽  
Anthocidaris Crassispina

Molecular cloning and characterization of ryanodine receptor from unfertilized sea urchin eggs

2002 ◽  
Vol 282 (3) ◽  
pp. R727-R737 ◽  
Author(s):  
Mieko Shiwa ◽  
Takashi Murayama ◽  
Yasuo Ogawa
Keyword(s):  
Ryanodine Receptor ◽  
Sea Urchin ◽  
Sea Urchins ◽  
Structural Features ◽  
Release Channel ◽  
Terminal Domain ◽  
Sea Urchin Egg ◽  
Cyclic Adp Ribose ◽  
Hemicentrotus Pulcherrimus

Unfertilized eggs of sea urchins ( Hemicentrotus pulcherrimus) demonstrated cyclic ADP-ribose (cADPR)-induced Ca2+ release and caffeine-induced Ca2+ release, both of which were considered to be mediated through the ryanodine receptor (RyR). We cloned cDNAs for sea urchin egg RyR (suRyR), which encode a 597-kDa protein of 5,317 amino acids. suRyR shares common structural features with known RyRs: the well-conserved COOH-terminal domain, which forms a functional Ca2+ channel, and a large hydrophilic NH2-terminal domain. suRyR shows amino acid sequence identity (43–45%) similar to the three mammalian RyR isoforms. Phylogenetic analysis indicates that suRyR branched from three isoforms of vertebrates before they diverged, suggesting that suRyR may be the only RyR isoform in the sea urchin. Four in-frame insertions were found in suRyR cDNAs, one of which was novel and unique, in that it had a cluster of serine residues. The transcripts with and without these insertions were found in the egg RNA. These results suggest that suRyR may be expressed as a functional Ca2+-induced Ca2+ release channel, which might also be involved in cADPR-induced Ca2+ release.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

scholarly journals Subtidal Marine Algal Community of Jisepo in Geoje, Korea

10.5109/16112 ◽  
2009 ◽  
Vol 54 (2) ◽  
pp. 339-345
Author(s):  
Chang Geun Choi ◽  
Seok Jin Oh ◽  
Ik Joon Kang
Keyword(s):  
Algal Community ◽  
Marine Algal

Subtidal Marine Algal Community and Endangered Species in Dokdo and Ulleungdo, Two Oceanic Islands in the East Sea of Korea

2020 ◽  
Vol 55 (4) ◽  
pp. 537-547
Author(s):  
Seung Wook Jung ◽  
Yoon Sik Oh ◽  
Hyun Soo Rho ◽  
Chang Geun Choi
Keyword(s):  
Endangered Species ◽  
Oceanic Islands ◽  
East Sea ◽  
Algal Community ◽  
Marine Algal
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