(n.) Silicon dioxide, SiO/. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.
Example Sentences:
(1) We have previously shown that intratracheally instilled silica (quartz) produces both morphologic evidence of emphysema and small-airway changes, and functional evidence of airflow obstruction.
(2) In the German Democratic Republic, patients with scleroderma and history of long term silica exposure are recognized as patients with occupational disease even though pneumoconiosis is not clearly demonstrated on X-ray film.
(3) Human gingival fibroblasts were allowed to attach and spread on bio-glasses for 1-72 h. Unreactive silica glass and cell culture polystyrene served as controls.
(4) The ADAM derivative of carnitine was separated from decomposition products of the reagent and related compounds such as amino acid derivatives on a silica gel column eluted with methanol-5% aqueous SDS-phosphoric acid (990:10:1).
(5) The deactivated columns had the residual silanols on the silica gel chemically inactivated to reduce the interaction with basic groups or analytes.
(6) We have investigated some of the factors which affect the retention times of these substances in reversed-phase HPLC on columns of 5-micron octadecylsilyl silica.
(7) The corresponding hydrides, mono-n-butyltin hydride, di-n-butyltin hydride, tri-n-butyltin hydride, monophenyltin hydride, diphenyltin hydride triphenyltin hydride, are detected by electron-capture gas chromatography after clean-up by silica gel column chromatography.
(8) The length of the hydrocarbon chains of the surface-modified silica supports had no significant influence on the selectivity.
(9) A novel type of ion exchanger was prepared by multipoint covalent binding of polystyrene chains onto the surface of porous silica followed by polymer-analogous modification of the bonded layer.
(10) The analytes were rapidly separated on an affinity column packed with phenylboronate-bonded silica.
(11) Using thin layer chromatography on fluorescent silica gel plates, 5 indoles were identified and 6 unknown substances isolated from the pineal incubate and from both extracts.
(12) Our results clearly demonstrate that capillary GC analysis of amino acids using fused silica bonded-phase columns provides data with good precision and in general excellent agreement with ion-exchange analyses.
(13) Free haem itself was bound to the silica column but could be released by globin.
(14) The methanol-ammonia (20:1) and chloroform-methanol-ammonia (2:2:1) systems, used with silica-gel plates, are the most promising for rapid preliminary screening of tuna fish extracts for histamine.
(15) The presence of Ca2+ in silica gel is responsible for this improved yield of prostaglandin as the divalent metal ion stabilized prostaglandin synthetase activity in a remarkable way.
(16) Silica accumulated linearly in the mediastinal lymph nodes and thymus for several months after cessation of exposure, while negligible amounts were found in kidney, spleen, liver, and blood.
(17) Methods employing electroosmotic flow in an untreated silica capillary were found to provide, at best, only partial resolution of the 23 fragments in a 1-kbp DNA ladder.
(18) The galactose lipid was isolated by column chromatography on DEAE-cellulose and silica gel.
(19) Adsorption experiments were performed by combining virus and silica in 0.1-ionic-strength buffers of pH 4.0, 6.4, and 8.5.
(20) The extracts are analyzed via a gas chromatograph equipped with a DB-1301 widebore fused-silica capillary column and an electron capture detector.
Sponge
Definition:
(n.) Any one of numerous species of Spongiae, or Porifera. See Illust. and Note under Spongiae.
(n.) The elastic fibrous skeleton of many species of horny Spongiae (keratosa), used for many purposes, especially the varieties of the genus Spongia. The most valuable sponges are found in the Mediterranean and the Red Sea, and on the coasts of Florida and the West Indies.
(n.) One who lives upon others; a pertinaceous and indolent dependent; a parasite; a sponger.
(n.) Any spongelike substance.
(n.) Dough before it is kneaded and formed into loaves, and after it is converted into a light, spongy mass by the agency of the yeast or leaven.
(n.) Iron from the puddling furnace, in a pasty condition.
(n.) Iron ore, in masses, reduced but not melted or worked.
(n.) A mop for cleaning the bore of a cannon after a discharge. It consists of a cylinder of wood, covered with sheepskin with the wool on, or cloth with a heavy looped nap, and having a handle, or staff.
(n.) The extremity, or point, of a horseshoe, answering to the heel.
(v. t.) To cleanse or wipe with a sponge; as, to sponge a slate or a cannon; to wet with a sponge; as, to sponge cloth.
(v. t.) To wipe out with a sponge, as letters or writing; to efface; to destroy all trace of.
(v. t.) Fig.: To deprive of something by imposition.
(v. t.) Fig.: To get by imposition or mean arts without cost; as, to sponge a breakfast.
(v. i.) To suck in, or imbile, as a sponge.
(v. i.) Fig.: To gain by mean arts, by intrusion, or hanging on; as, an idler sponges on his neighbor.
(v. i.) To be converted, as dough, into a light, spongy mass by the agency of yeast, or leaven.
Example Sentences:
(1) The popularly used procedure in Great Britain is that in which a sheet of Ivalon sponge is sutured to the sacrum and wrapped around the rectum thus anchoring it in place.
(2) Similar sponges were reintroduced into four ewes at each of the intervals 1, 3, 5, and 7 days later; three ewes served as controls.
(3) After washing for 7 days and freeze drying the resultant collagen sponge was tested with regard to mechanical, physical, enzymatic degradation properties and biological responses.
(4) The substance benzalconium chloride (BZC) was contained in vaginal sponges (n = 46), pessaries (n = 4) and cream (n = 6) at a dose rate of 1.18%.
(5) Depending on depth regions from which the sponges were collected, differences in occurrence of metabolites were observed.
(6) Turn the sponge out onto the paper, then carefully peel off the lining paper.
(7) The concentrations of NaB3H4-reducible collagen cross-links were determined at the time when collagen fibres and bundles are observed in electron micrographs of connective tissue developing around the implanted Ivalon sponge in adult male rats.
(8) Nonetheless, these donor-reactive CTL rarely constitute more than 0.5% of the T cells recovered from sponge allografts, even at the peak of the rejection response.
(9) Attention is given to the poor design of a disposable cellulose sponge that results in frequent hooking of sutures during microsurgical procedures.
(10) The effects of epidermal growth factor (EGF) on granulation-tissue formation and collagen-gene expression were studied in experimental sponge-induced granulomas in rats.
(11) In spite of the growing variety of materials being used in the manufacture of intraabdominal packs (sponges), no data have been published on their adhesion-producing properties.
(12) Of the 19 women, 4 of 6 sponge users (66%) developed a bacterial vaginosis recurrence (RR 2.93, 95% CI: 1.43-6.02).
(13) Explants of a human sacral chordoma were successfully maintained on collagen-coated coverslips, gelfoam sponge matrices, and Millipore filter platforms for up to 30 days.
(14) A fraction prepared from normal human plasma inhibits the migration of polymorphonuclear and mononuclear leucocytes into inflammatory exudates produced by the intrapleural injection of carrageeman or turpentine by the subcutaneous implantation of polyvinyl sponges in the rat.
(15) These sponges were dissociated both mechanically, which leaves the factor on the cell surface, and by Humphrey's (1963) method, which isolates the factor from the cells.
(16) Five new 20,24-bishomoscalarane sesterterpenes, phyllactones A [1], B [2], C [3], D [4], and E [5], are reported from the sponge Phyllospongia foliascens collected in the waters of the Nansha Islands in the South China Sea.
(17) To determine if alloantigen-induced .N = O production might be operative in vivo, cells that had infiltrated a rat sponge matrix allograft were tested for de novo .N = O production as well as .N = O production upon restimulation with the sensitizing alloantigen.
(18) The fine structure of four glioblastomas and two cerebellar astrocytomas maintained in organ culture systems up to 137 days and 43 days, respectively, using either a three-dimensional sponge foam matrix technic or a Millipore filter platform technic, is described and compared.
(19) The intensity-measuring device in both apparatuses has a mobile disk attached to a motionless axis by a spiral spring; the clamps have fixing screws in the butts of a spong.
(20) Initially, 4-5 days post-operative, the plasma clot maintained the grafted cells in a loose sponge-like sack at the site of implantation.