Results 181 to 190 of about 1,686,937 (226)
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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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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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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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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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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.
Tosi L +5 more
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Hyaluronidase in Sea-Urchin Sperm
Nature, 1947A SUBSTANCE liquefying the jelly-coat of sea-urchin eggs was first recovered from the sperm of sea-urchins by Hartmann and Schartau1, who called it 'Androgamone II'. The enzyme nature of this substance was, however, denied2; moreover, it was pointed out that hyaluronidase from bull testis does not dissolve the jelly-coat of sea-urchin eggs3.
A, MONROY, A, RUFFO
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The chromatin of sea urchin sperm
Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression, 1987Digestion of sea urchin sperm nuclei with micrococcal nuclease yields nucleosomal monomer fragments of 151 and 164 base pairs. Prior trypsin treatment of the sperm chromatin does not alter the size of these monomer DNA fragments despite the fact that the H1 histone is reduced to a limit globular peptide of about 83 residues. Heterologous reconstitution
P, Puigdomenech +5 more
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Activation of Sea Urchin Gametes
Annual Review of Cell Biology, 1986CONTENTS INTRODUCTION .••••••••........ 1 SPERMATOZOA . .. . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . ...... . . . . . . . . . . . .. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . 3 Activation of Motility and Respiration... . . . . . . . . . . . . . . . . . . . . .
J S, Trimmer, V D, Vacquier
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The nomenclature of the spinochromes of sea urchins
Experientia, 1951La presente note contient une proposition de nomenclature des pigments naphtoquinoniques des parties calcaires d'Oursins. Les differents spinochromes sont designes par des lettres majuscules,A, B, C, etc. Le tableau donne cette nomenclature.
T W, GOODWIN, E, LEDERER, L, MUSAJO
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2019
Cilia are exceptionally complicated subcellular structures involved in swimming and developmental signaling, including induction of left-right asymmetry in larval stages. We summarize the history of research on sea urchin embryonic cilia. The high salt method to isolate cilia is presented first; methods to block cilia formation and to lengthen cilia ...
Robert L, Morris, Victor D, Vacquier
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Cilia are exceptionally complicated subcellular structures involved in swimming and developmental signaling, including induction of left-right asymmetry in larval stages. We summarize the history of research on sea urchin embryonic cilia. The high salt method to isolate cilia is presented first; methods to block cilia formation and to lengthen cilia ...
Robert L, Morris, Victor D, Vacquier
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