(n.) Any Old Word rodent of the genus Hystrix, having the back covered with long, sharp, erectile spines or quills, sometimes a foot long. The common species of Europe and Asia (Hystrix cristata) is the best known.
(n.) Any species of Erethizon and related genera, native of America. They are related to the true porcupines, but have shorter spines, and are arboreal in their habits. The Canada porcupine (Erethizon dorsatus) is a well known species.
Example Sentences:
(1) It is apparent that seasonal acclimatization of the Cape porcupine is also reflected by these parameters.
(2) The parasites in these and eight cases previously reported from the northern United States and Canada are classified as resembling Dirofilaria ursi, a primarily subcutaneous parasite of bears, or D. subdermata of porcupines, in the same region.
(3) Overall minimal thermal conductance was calculated for newborn and paired adult porcupines.
(4) Trypanosoma cruzi-like parasites were found in 13 different species, and were particularly common in a variety of marsupials (Didelphidae), porcupines (Coendou spp.
(5) The woodchuck had a higher threshold and significantly smaller slope to its CO2 ventilatory response compared to the porcupine, but showed no difference in its hypoxic ventilatory response.
(6) It is suggested therefore that the Caviomorpha (guinea pig-like rodents) and possibly the Hystricomorpha (porcupine-like rodents) should be elevated in taxonomic rank and conferred an ordinal status distinct from the Rodentia.
(7) Aureobasidium pullulans was repeatedly isolated from a cutaneous infection of a porcupine (Erethizon dorsatum).
(8) The Quill Location: Southwark | Floors: 31 | Height: 109m | Architect: SPARRC | Status: approved | Use: student accommodation The Quill What would a building look like if it had a fight with a gigantic porcupine, and the porcupine won?
(9) The results indicate that plasma progesterone-binding proteins in Cape porcupines (Old World hystricomorph) are similar in composition to those in guinea-pigs (New World hystricomorph).
(10) The reproductive tract of the male Cape porcupine is morphologically and histologically similar to that of New World hystricomorph rodents.
(11) The constituent cell types of the ovary of the porcupine were similar to those of New World hystricomorph rodents and accessory corpora lutea and luteal bodies were formed through the luteinization of the membrana granulosa or theca interna of antral follicles.
(12) The woodchuck P50 of 27.8 was hardly different from the porcupine value of 30.7, but the Bohr factor, -0.72, was greater than the porcupine's, -0.413.
(13) This is the first report of notoedric acariasis in the porcupine.
(14) Sled dogs from five native villages on the range of the Artic caribou herd, but not from two villages on the the range of the Porcupine caribou herd, are commonly infected.
(15) Methods used to produce wounds included insertion of porcupine quills, application of constrictive rubber bands, mascara injections and excoriation of healing wounds.
(16) Mass-specific food and water intake of control and lactating porcupines was examined throughout the 68-78 days of lactation.
(17) Sexually mature female Cape porcupines kept under natural conditions of illumination and temperature did not conceive while housed within their natal groups.
(18) The reproductive pattern of porcupines is associated with low juvenile mortality and long adult lifespan (both of which reflect the porcupine's protective morphology), and may be related to the quality of winter diets.
(19) Six of 16 porcupines (Erethizon dorsatum) live-trapped in Sullivan County, Pennsylvania were infested with the mite Notoedres douglasi.
(20) To assess the effect of huddling, these parameters were also measured in adult pairs of porcupines (Ta = 15 and 25 degrees C) kept together in the metabolic chamber and the values were compared with those obtained from single porcupines.
Urchin
Definition:
(n.) A hedgehog.
(n.) A sea urchin. See Sea urchin.
(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.