Results 281 to 290 of about 83,182 (308)
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Sea urchin DNA methyltransferases
Cell Biophysics, 1989DNA methyltransferase activities have been partially purified from unfertilized eggs and blastula nuclei of sea urchin embryos. Comparative studies, using different DNAs as substrates, show that the two preparations are most active on hemimethylated and single-strand DNA, but they methylate, though at a lower rate, also on double-strand DNA.
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Biological Reviews, 1951
Summaryi. The head of the sea‐urchin spermatozoon is pear‐shaped and axially symmetrical. The sub‐microscopic morphology of the middle piece has not been investigated, but the tail, which terminates in an axial fibre, probably contains spiral or coiled structures, as in mammalian spermatozoa.2.
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Summaryi. The head of the sea‐urchin spermatozoon is pear‐shaped and axially symmetrical. The sub‐microscopic morphology of the middle piece has not been investigated, but the tail, which terminates in an axial fibre, probably contains spiral or coiled structures, as in mammalian spermatozoa.2.
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2004
Publisher Summary The chapter describes the structures and functions of sea urchin spermatozoa. Methods for the isolation of different parts of the sea urchin sperm are discussed. Sea urchin sperm are specialized for five functions: (1) oxidative phosphorylation to produce ATP, (2) flagellar motility, (3) the acrosome reaction, (4) binding to the egg,
Victor D. Vacquier, Noritaka Hirohashi
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Publisher Summary The chapter describes the structures and functions of sea urchin spermatozoa. Methods for the isolation of different parts of the sea urchin sperm are discussed. Sea urchin sperm are specialized for five functions: (1) oxidative phosphorylation to produce ATP, (2) flagellar motility, (3) the acrosome reaction, (4) binding to the egg,
Victor D. Vacquier, Noritaka Hirohashi
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Clinical Toxicology, 2005
A 25-year-old female was walking along a shallow tropical reef when she felt a sharp pain in her right great toe. Upon exiting the water, she noted multiple dark spines protruding from the foot.
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A 25-year-old female was walking along a shallow tropical reef when she felt a sharp pain in her right great toe. Upon exiting the water, she noted multiple dark spines protruding from the foot.
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Dermatology, 2005
Sea urchin granuloma is a chronic focal response to the puncture of sea urchin spines, induced by the permanence of prickle remnants in the wound. Until recent years, it was thought to represent a foreign body reaction but, following the description, in 2001, of its several histologic forms, the spectrum of its likely pathogenetic mechanisms has ...
CAPUTO, Valentina, FIORELLA, Santi
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Sea urchin granuloma is a chronic focal response to the puncture of sea urchin spines, induced by the permanence of prickle remnants in the wound. Until recent years, it was thought to represent a foreign body reaction but, following the description, in 2001, of its several histologic forms, the spectrum of its likely pathogenetic mechanisms has ...
CAPUTO, Valentina, FIORELLA, Santi
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1996
Publisher Summary From the first demonstration that the mitotic apparatus could be isolated as a discrete entity, to the identification of the colchicine-binding protein, tubulin, to the purification of an mRNA-polyribosome-microtubule complex, sea urchin eggs and embryos have been a model system for the study of microtubule formation and function ...
Foltz Daggett Ma, Suprenant Ka
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Publisher Summary From the first demonstration that the mitotic apparatus could be isolated as a discrete entity, to the identification of the colchicine-binding protein, tubulin, to the purification of an mRNA-polyribosome-microtubule complex, sea urchin eggs and embryos have been a model system for the study of microtubule formation and function ...
Foltz Daggett Ma, Suprenant Ka
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2016
In the sea urchin morphogenesis follows extensive molecular specification. The specification controls the many morphogenetic events and these, in turn, precede patterning steps that establish the larval body plan. To understand how the embryo is built it was necessary to understand those series of molecular steps.
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In the sea urchin morphogenesis follows extensive molecular specification. The specification controls the many morphogenetic events and these, in turn, precede patterning steps that establish the larval body plan. To understand how the embryo is built it was necessary to understand those series of molecular steps.
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Arylsulfatase of sea urchin sperm
Developmental Biology, 1980Abstract An arylsulfatase is defined as a lysin of sea urchin sperm from the following evidences. (1) The activity is detected in the sperm of all the sea urchins investigated, and the activity is partially liberated from the cells after the acrosome reaction ( Moriya and Hoshi, 1979 ).
Tsuneo Moriya, Motonori Hoshi
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2013
Abstract Immunology is a very important subject and has important consequences for sea urchins in the field and in culture and also in the selection of the wild populations, especially because the sea urchin adults have limited capacity of moving when the environment changes, although dispersal by larvae is possible.
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Abstract Immunology is a very important subject and has important consequences for sea urchins in the field and in culture and also in the selection of the wild populations, especially because the sea urchin adults have limited capacity of moving when the environment changes, although dispersal by larvae is possible.
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