(n.) A mischievous elf supposed sometimes to take the form a hedgehog.
(n.) A pert or roguish child; -- now commonly used only of a boy.
(n.) One of a pair in a series of small card cylinders, arranged around a carding drum; -- so called from its fancied resemblance to the hedgehog.
(a.) Rough; pricking; piercing.
Example Sentences:
(1) CyIIIa.CAT) expression simultaneously in embryos bearing excess competitor regulatory DNA, we developed, and here describe, a new procedure for generating transgenic sea urchin embryos in which all of the cells in many embryos, and most in others, bear the exogenous DNA.
(2) An oligonucleosome 12-mer was reconstituted in the absence of linker histones, onto a DNA template consisting of 12 tandemly arranged 208-base pair fragments of the 5 S rRNA gene from the sea urchin Ly-techinus variegatus (Simpson, R. T., Thoma, F. S., and Burbaker, J. M. (1985) Cell 42, 799-808).
(3) 1c for structure), for continuous measurement of [Ca2+]i from fertilization through the first cleavage of individual eggs of the sea urchin Lytechinus pictus.
(4) The agglutination of the sea urchin spermatozoa was inhibited specifically by ceratain carbohydrates.
(5) The levels of different classes of mitochondrially encoded transcripts are developmentally regulated in sea urchin embryos, as a result of selection between mutually exclusive synthetic pathways.
(6) Antimicrobial activity of polyhydroxynaphthoquinones from sea urchins was studied.
(7) A special type of beta-turn structural motif has been proposed for this sequence, and it has been shown that a segment of the sea urchin sperm H1 N terminus, which has six repeats of the motif (S6 peptide), binds to DNA and competes with the DNA binding drug Hoechst 33258.
(8) The fertilization reaction of echinoderm eggs (Lytechinus pictus, a sea urchin, and Dendraster excentricus, a sand dollar) was followed with intracellular electrodes.
(9) Sperm-specific histone variants in the sea urchin Paracentrotus lividus are replaced early after fertilization with a specific embryonic set of histone variants.
(10) Spermidine is rapidly taken up and becomes bound to protein during the very early hours of sea urchin embryogenesis.
(11) The tandemly repeated genes were expressed at a higher rate in blastula than in gastrula stage relative to the single-copy gene, when the two genes were injected into sea urchin zygotes.
(12) The purine inhibits the detachment of the vitelline layer from the sea-urchin egg plasma membrane after fertilization and this effect leads to polyspermy.
(13) Microtubule assembly is required for the formation of the male and female pronuclei during mouse, but not sea urchin, fertilization.
(14) In situ hybridization of sea urchin (Psammechinus miliaris, Lytechinus pictus and Strongylocentrotus purpuratus) histone messenger RNA has been used to map complementary sequences on polytene chromosomes from Drosophila melanogaster.
(15) We have examined the relationship between the newly synthesized mRNA that enters polysomes in sea urchin embryos and the messengerlike RNA that enters the pool of ribosome-free ribonucleoprotein particles (free RNPs or informosomes).
(16) Individual oocytes of the sea urchin with diameters which ranged from 86 to 102% that of the average diameter for mature eggs from the same female were examined.
(17) Puncture wounds were cuased in 9 patients by sea urchin spines and 1 patient by a date palm thorn.
(18) A method based on the degradation by enzymes and nitrous acid of isotopically labelled glycosaminoglycans has been employed to study the synthesis of these compounds in normal, animalized and vegetalized sea urchin embryos.
(19) From these results, we conclude that USE 1 and perhaps USE 2 in the H2A modulator are upstream transcriptional elements that are recognized by trans-acting factors common to Xenopus and sea urchin.
(20) We have used an in vitro assay to characterize some of the motile properties of sea urchin egg kinesin.