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Showing 1 to 20 of 79 for “"Sea Urchin"”.
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Deoxyribonuclease probing on sea urchin embryo chromatin
The role that the sea urchin, Parechinus angulosus, embryo and sperm histone variants play in chromatin structure has been investigated. Chromatin structure has been determined at different levels of resolution in sperm and in developing embryos using micrococcal nuclease, pancreatic …
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Complementary DNA to sea urchin histone messenger RNA
… of 9S RNA was isolated from early blastula sea urchin embryo polyribosomes by phenol extraction followed by repeated sucrose density gradient centrifugation. When incubated in an ascites cell free protein synthesizing system this preparation of RNA was shown to support the synthesis of sea …
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Microstructure and micromechanics of the sea urchin, Colobocentrotus atratus
The purpose of this research is to study the porous microstructure and the micromechanics of the exoskeletal armor of the helmet urchin, Colobocentrotus atratus. Its unusual reduction in spines forms a smooth tiling of millimeter-sized, flattened polygonal protective aboral spines. Each aboral …
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Phenotypic and Genetic Diversity in the Sea Urchin Lytechinus Variegatus
… of color patterns and morphology of the sea urchin <italic>Lytechinus variegatus </italic>. This study had 3 objectives: 1) to describe and quantify phenotypic diversity--color and morphology--throughout the geographic range; 2) to determine the heritability of color in genetic crosses …
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Physical mapping of an early sea urchin gene battery from Parenchinus angulosus
The aim of this project was to characterise an early histone gene battery isolated from Parenchinus angulosus. An early histone gene battery (named H27) which was believed to have been isolated from Parenchinus angulosus, appeared by restriction enzyme mapping and partial sequencing to be identical …
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The Distribution of Rna Template Within The Egg and Embryo of The Sea Urchin
Made available in DSpace on 2014-12-12T01:27:31Z (GMT). No. of bitstreams: 1 7114949.pdf: 3459569 bytes, checksum: ae8833be66992c53ab0bb153110b9c5a (MD5) Previous issue date: 1970
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Acid-base regulation in the sea urchin Parechinus angulosus during CO₂-induced seawater acidification
… rates and weak ability to regulate ion exchange, sea urchins are thought to be particularly weak acid-base regulators. Recent findings showing species-specific capacities for extracellular pH regulation however suggest that species currently exposed to natural CO₂ elevations, such as upwelling …
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Protein purification and cDNA cloning of suGF1 : a sea urchin nuclear DNA-binding factor
… scale from embryonic nuclear extracts of the sea urchin Parechinus angulosus (1, 2). suGF1 binds in vitro to the H1-H4 intergenic region of the early histone gene battery, and the recognition site contains 11 contiguous Gs which are incorporated into a positioned nucleosome core in vitro. …
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Developmental Single-Cell RNA Sequencing in the Sea Urchin Species Lytechinus variegatus and Heliocidaris erythrogramma
… of that process is even more enigmatic. In sea urchin embryos, cell fate specification and differentiation of cell types occurs through gene regulatory networks, or circuits of nodes or genes that interact with and regulate each other’s DNA elements. However, what remains unclear is how a …
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Investigation of the roles of ion channels in the development of the sea urchin embryo
Ion channels and pumps play critical roles during sea urchin development including mediating the blocks to polyspermy, regulating left-right and dorsal-ventral axis specification, directing ventral PMC migration, and controlling biomineralization of the larval skeleton. We performed a screen of …
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The histone H1 of the sea urchin embryo, partial structures, enzymatic modifactions and developmental programme
Developmental biology owes a tremendous debt to sea urchins. These animals have proved to be experimental jewels, and since they are distributed abundantly along the Peninsula coastline, they are readily at hand. Sea urchin embryos have been shown to be extremely well suited for analysis of …
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Biomarkers (lipids, fatty acids and stable isotopes) to examine diet of the sea urchin Evechinus chloroticus.
… improve the knowledge of feeding habits of wild sea urchins from north-eastern New Zealand, revealing a high contribution from Ecklonia radiata to E. chloroticus diets, but also a contribution from Carpophyllum plumosum in the Hauraki Gulf. The use of lipid and fatty acid composition of E. …
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Effects of Bisphenol-A and Styrene on Fertilization and Development of the Purple Sea Urchin (Strongylocentrotus purpuratus)
… and get ingested by marine mammals, turtles, and sea birds, but they also leach chemicals, such as bisphenol-A (BPA) and styrene into the aquatic environment. While some of these chemicals are known to be toxic, few studies have examined their effects on broadcast spawning marine invertebrates, …
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An electrophoretic method for the isolation of isohistones from the embryo of the sea urchin Parechinus Angulosus
It is the aim of this project to isolate sea urchin embryo histone variants by preparative polyacrylamide gel electrophoresis and to prove me identity of the isolated proteins by amino acid composition and partial sequencing. This serves two purposes, namely, the unequivocal identification of …
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Management options for the sustainable development of a common marine resource in Maine : the green sea urchin
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Short-Range Inter-Blastomere Signaling Specifies Ectodermal Fate and is Required for Skeletal Patterning in the Sea Urchin
<p>Sea urchin larvae possess a beautiful, intricately patterned, calcium-carbonate skeleton. Formation of this complex structure results from two independent processes within the developing embryo: specification of the mesenchymal cells that produce the skeletal rods, and patterning inputs from the …
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Immunostimulatory effects of different aspects of aquaculture on the host response in the edible sea urchin, paracentrotus lividus
… aquaculture on the host response of the edible sea urchin, Paracentrotus lividus, which are a prized delicacy (roe) in many Asian and Mediterranean countries. In Chapter 1, the importance of understanding the biology, ecology, and physiology of P. lividus, as well as the current status in the …
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