(n.) A pearly substance which lines the interior of many shells, and is most perfect in the mother-of-pearl. [Written also nacker and naker.] See Pearl, and Mother-of-pearl.
Example Sentences:
(1) When nacreous shell produced by the marine oyster Pinctada maxima, used as a biomaterial in oral surgery, is implanted in human bone, new bone formation occurs, resulting in a tight welding of the bone to the nacre [16].
(2) Dilute suspensions of normal erythrocytes exhibit a pearl-like sheen (nacre) when subjected to flow.
(3) Nacre implanted in vivo in bone is osteogenic suggesting that it may possess factor(s) which stimulate bone formation.
(4) These observations are discussed namely in relation to the problem of structural identification of the EDTA soluble fraction of the nacre conchiolin.
(5) To test this hypothesis, we have evaluated the effect of the simultaneous presence of bone and nacre on human osteoblasts in vitro.
(6) In other areas (along the main course of the mantle), transient adhesions between the outer mantle epithelial cells and the nacre appear to temporally further compartmentalize the extrapallial fluid possibly as a prerequisite for the initial crystallization phenomenon.
(7) Induction of mineralization appeared preferentially in bundles of osteoblasts surrounding the nacre chips.
(8) Nacre chips (1 mm3) were placed at approximately 1 mm distance from a similarly sized bone chip on a layer of first passage human osteoblasts.
(9) The five tissues, extracellularly mineralizing algae, radial and granular foraminifera, mammalian bone, mammalian enamel, and mollusk shell nacre, probably span the entire spectrum.
(10) The degree of nacre can be measured by comparing the intensity of scattered red light at an angle of 45 degrees for the flowing system to that when the effect has disappeared.
(11) The results demonstrated that nacre has strong osteogenic effects on human osteoblasts when placed in proximity to bone in vitro.
(12) These findings are consistent with the possibility that nacre adjacent to bone can locally stimulate osteogenic activity.
(13) These results demonstrate that a complete sequence of bone formation is reproduced when human osteoblasts are cultured in the presence of nacre.
(14) In addition, under the conditions of culture used, nacre can also promote the formation by osteoblasts of a structure with characteristics similar to nacre (e.g., lamellar organic matrix mineralized with aragonite, as demonstrated by Laser Raman Spectroscopy).
(15) Osteoblasts proliferated and were clearly attracted by nacre chips to which they attached.
(16) A woman exposed to the dust of sea-snail shells during the manufacture of nacre buttons had clinical and immunological features typical of hypersensitivity pneumonitis; however, transbronchial lung biopsy showed alveolar-septal amyloidosis.
(17) Nacre chips were placed on a layer of first passage human osteoblasts.
(18) The present study was undertaken to test the hypothesis that nacre can induce mineralization by human osteoblasts in vitro.
(a.) Resembling pearl or pearls; clear; pure; transparent; iridescent; as, the pearly dew or flood.
Example Sentences:
(1) These receptors were subdivided by their morphology in the next groups: pear-shaped receptors with capsule; capsuled spherical receptors located near vascular walls; ovoidal receptors with capsule and glomerular structure; simple or complex mace-shaped receptors without capsule.
(2) This protein was not present in extracts from pears or apples.
(3) The pearly skin of these subjects becomes more translucent and the detail extra-perfect.
(4) Other designs included short ruffle cocktail dresses with velvet parkas slung over the shoulder; blazers made of stringed pearly pink; and gold beading and a lace catsuit.
(5) The aim was to create an infinite number of ways in which the story could be read – though Pears emphasised that Arcadia was not an interactive novel.
(6) Computer taxonomic studies using the nucleotide and inferred amino acid sequence of the MOMP of C. pneumoniae IOL-207 and all known chlamydial MOMP sequences supported the designation of C. pneumoniae as a new species, but electron microscope studies suggested that the presence of pear-shaped elementary bodies (EBs) may not be a reliable taxonomic criterion.
(7) On admission, she had an asymmetrical pear-shaped tumor in the right supraclavicular region and severe hypercalcemia.
(8) Adsorption with extracts from apples and pears had no such effect.
(9) Boiling of spinach, pears, grapes, tomatoes, and wheat, treated with different EBDCs, resulted in 3-30% conversion to ETU.
(10) The stenosis appeared to be caused by a specific change in the pattern of growth leading up to an anterior narrowing ('pear'-like) of the cricoid ring and a conspicuous thickening of the subepithelial layer.
(11) The "startle response" ap peared earlier in the experimental ani mals, as did the development and re sponse of the electroencephalogram to novel stimuli.
(12) At least six different cell types are recognizable: (1) nondifferentiated duct cells; (2) cells containing apical secretory granules; (3) goblet cells; the mucosubstances of type 2 and 3 are PAS- and Alcian-blue-positive, also reacting wih methenamine silver; (4) ciliated cells, containing a single cilium with the microtubular pattern 9+2; (5) tuft cells with extremely long and wide microvilli and a pear-shaped cell body; (6) migrating cells, mainly lymphocytes and some assumed eosinophils, showing reaction to Mg++-activated ATPase.
(13) I was a dancing Fury; I'm told that Peter Pears came but I never saw him."
(14) Such a pear-like geometrical figure is, in fact, formed spontaneously by DNA collapsed under certain conditions in vitro (Eickbush & Moudrianakis, 1978).
(15) The character George Bowling bites into a frankfurter he has bought in an milk bar decorated in chrome and mirrors: "The thing burst in my mouth like a rotten pear.
(16) They were amacrine cells with a pear-shaped soma and dendrites distributed in 3 sublayers within the inner plexiform layer.
(17) We are talking about apples and pears when we compare the two.
(18) Children's author Allan Ahlberg, the mind behind much-loved titles Peepo and Each Peach Pear Plum, has turned down a lifetime achievement award because it is sponsored by Amazon and the idea that his success "should have the Amazon tag attached to it is unacceptable".
(19) These axon endings are supposed to belong to afferent climbing fibers of cerebellum stimulating differentiation of pear-shaped neurons, localization of these fibers causing a certain succession in the development of perisomatic processes.
(20) The trichorhinopharyngeal (TRP) syndrome type I (Giedion, 1966) is characterized clinically by craniofacial dysmorphism with sparse hair, pear-shaped nose and long philtrum, and abnormalities of the extremities (disabling deformities of the hands and feet).