The alloy or metal to be assayed.
To subject, as an ore, alloy, or other metallic compound, to chemical or metallurgical examination, in order to determine the amount of a particular metal contained in it, or to ascertain its composition.
A laboratory procedure to determine the activity of an enzyme isolated from a patient when compared to normal, or the amount of a particular substance found in blood or urine that may be present in excessive amounts.
A test to detect the presence and concentration of a drug or substance in the blood, other body fluids, or body tissues.
A laboratory test performed to quantitatively or qualitatively measure a substance.
The analysis of soils to determine the concentrations of component minerals.
The act of testing gold or silver to determine its purity.
The chemical analysis of an ore, mineral, concentrate or metal to determine the amount of valuable species. Precious metals are usually given in ounces per short ton or grams per metric tonne (like gold and silver), while base metals (copper) are given in percentage or PPM (parts per million).
technique for measuring a biological response.
To analyze a metal to determine its purity.
test or chemical analysis
the testing of an ore sample to determine its precious metal value
Analysis used to determine the presence, absence, or quantity of a substance or biological activity
A method for measuring a biological activity. This may be enzyme activity, binding affinity, or protein turnover. Most assays utilize a measurable parameter such as color, fluorescence or radioactivity to correlate with the biological activity.
Laboratory procedure used to determine biomarker, or tumor marker, levels. The antigen-antibody reaction is the essence of most tumor marker assays.
1. Process of quantitative or qualitative analysis of a component of a sample. 2. Results of a quantitative or qualitative analysis of a component of a sample.
1 The testing of metals for purity of gold or silver content, carried out by an assay office or an institution such as a guild, according to standards set by the government. In Britain there are currently four active assay offices: London, Birmingham, Sheffield and Edinburgh, each with its own distinctive hallmark. 2 The term is also used to describe a sample piece of work by a craftsman or registration with a guild. See HALLMARK, STERLING STANDARD.
Analytical test or trial to ascertain the fineness, or purity, and consistency of precious and other metals. Backwardization: A market situation in which prices are progressively lower in future months than in the nearest month. Opposite of "Contango." Bactericides: Materials, such as silver salts, that kill bacteria. Base metals: Metals that are not noble or precious and serve as a base for any object clad or covered with precious metals. Bear Market: A market where prices are falling or expected to fall.
A method to analyze or quantify a substance in a sample. An assay is an analysis done to determine: 1. The presence of a substance and the amount of that substance. 2. The biological or pharmacological potency of a drug.
Determination of the amount of a particular constituent of a mixture or the biological or pharmacological potency of a drug.
The process of testing a chemical sample for activity against a specific target or cellular response.
The analysis of the proportions of metals in ore, or the testing of an ore or mineral for composition, purity, weight, or other properties of commercial interest.
To provide an exact result which allows an accurate statement on the content or potency of the analyze in a sample (ICH)
Experimental procedure to determine the magnitude of a property of a substance. Usually used in a biological or biochemical context.
Analysis of a substance, especially of a precious metal, to determine its components.
A method of determining the presence or quantity of a component, usually in our case, a bioactive molecule.
an in vitro test system used to estimate the concentration or potency of a substance by measuring its biological response.
a substance that is undergoing an analysis of its components
a written report of the results of an analysis of the composition of some substance
analyze (chemical substances)
an analysis of your blood that tells us what your body is producing and what it is not
a procedure for the determination of
a reproducible procedure for testing a particular reaction
a study done to determine the amount of a particular constituent of a mixture, in this case, VMA (vanillylmandelic acid) and metanephrines (a methylated metabolite of epinephrine excreted in the urine)
The testing of a sample of ore to determine the content of valuable minerals.
Analysis to determine the presence, absence, or quantity of one or more components
a qualitative or quantitative analysis of a substance, especially of an ore or drug.
Test to determine the content or concentration of a substance.
the determination of valuable minerals in a sample
an analysis to determine the components of a sample
the process of establishing the standards of purity of gold, silver and other alloys reach the required legal standard without actually analysing the total composition of the alloy. After successful assay the article is hallmark ed outside the US. dvb regularly assays its finished pieces to ensure standards are maintained though it is not a legal requirement in the US
An independent qualitative and quantitative evaluation of the chemical elements contained in metals. LME contract specifications define the required purity and minimum assay that registered brands must meet.
a procedure for measuring the biological or immunological activity of (a sample).4
The testing of a metal or ore to determine its ingredients, purity and quality.
It is impractical for a refiner to refine each individual shipment of scrap separately. To keep the operation efficient, a sample is taken of each refining shipment to determine its precious metal content. Drilling samples are taken from each end of the bullion. The assay laboratory does a miniature refining process on the two samples to determine the precious content. The bullion karat is actually determined by the percentage of fine gold left following the assaying process. For example, 2-100 milligram samples are taken. The samples are wrapped in lead, placed onto cupels and put into a special assay furnace. As the samples become molten, the base metals, including the lead, vaporize or absorb into the cupels, leaving only the precious metal on top. The precious metal buttons are dissolved in the acid so that the gold content can be determined. The remaining samples are reweighed. If the 100 milligram samples now weigh only 50 milligrams, this means that there is 50% fine gold in the bullion.
Analysis to determine the presence, absence or quantity of a particular chemical or effect.
The independent evaluation of the physiochemical composition of a metal to determine its degree of purity. LME-registered brands must meet specified metal contents and maximum levels of impurity, and are assayed to establish this.
measure of activity of a biological compound
a test of a substance using visual or numerical data that determines the components of that substance
to determine the purity of the metal by scientific means.
(ASSAYER) The test (or tester) of the purity of gold. Often officially appointed and recognised to assay coins and jewellery.
A chemical test performed on a rock, soil or vegetation sample to determine the amount of valuable metals contained within.
To analyze the proportions of metals in an ore, to test an ore or mineral for composition, purity, weight, or other properties of commercial interest.
Pronunciation: (AS-say) A laboratory test to find and measure the amount of a specific substance.
a method of performing a standard test for the quality or quantity of a substance (ex: PSA). Assay results may vary depending on the methods, reagents and equipment used.
the chemical test of rock samples to determine the mineral content.
Examination and determination as to characteristics (as weight, measure, or quality) analysis to determine one or more components. The tabulated results of assaying.
A test that identifies either antigens or antibodies to diagnose an infection.
To test a metal or an oil for purity or quality.
A test performed to determine the weight and purity (fineness) of the precious metal contained in a piece.
a test for measuring a biological response or for determining such characteristics as composition, activity, purity, and weight.
A procedure for detecting the presence, estimating the concentration, and determining the biological activity of a macromolecule, molecule, ion, or cell. Assays are based on measurable parameters that enable the evaluation of differences between samples and controls. Sensitivity, the ability to detect small amounts of a substance, and specificity, the ability to detect only the analyte, are essential featu
A test, usually carried out in a laboratory, to determine the concentration of a particular substance. In biology, this often refers to a test to determine the activity of a biological molecule, for example, an enzyme.
a test to ascertain the fineness and weight of a precious metal.
A test for a specific chemical, microbe, or effect.
an analysis to determine the quantity of one or more elemental components
a test that is used to measure the concentration of a substance.
qualitative (condition) or quantitative (amount) analysis of a substance; a test.
A chemical test performed on a sample of ore or mineralized rock to determine the concentration of metals and other elements.
A test designed to determine the presence and concentration of a substance.
An assay is an analysis done to determine: The presence of a substance and the amount of that substance. Thus, an assay may be done for example to determine the level of thyroid hormones in the blood of a person suspected of being hypothyroid (or hyperthyroid). The biological or pharmacological potency of a drug. For example, an assay may be done of a vaccine to determine its potency. See the entire definition of Assay
An experimental test system for the identification of a substance acting on the biological activity of proteins.
Examination and determination of the characteristics and/or the components of a sample.
A chemical process used to determine the fine precious metal content of materials. Can be expressed as a percentage or carat rating e.g. 9ct.
Analysis of a mixture to determine the presence or concentration of a particular component.
The evaluation or analysis of ore to determine the proportion of gold, silver or other valuable metals. Usually an assay is done by chemical methods and was fairly accurate.
A chemical test by wet or fire methods performed on a rock sample to determine the amount of valuable metal contained.
The testing of metal to establish a level of purity.
A chemical test performed on a sample of ores or minerals to determine the amount of valuable metals contained.
to analyze and determine the characteristics and composition of a metal
The process of testing for silver purity. A small sample of metal is removed from the object and subjected to various chemical processes. The standard marks struck a piece at the assay office are a guarantee of their particular standard for silver purity.
To analyze and determine the purity of metal.
Immunization Purpura Immunoassay
A test system consisting of targets and chemical substances, which is evaluated by measuring instruments in order to determine chemical or biological activity.
Synonymous with test or test method, e.g. enzyme immunoassay or complement fixation test..
An analysis of a collected mineral sample or specimen to identify and measure the presence of base and/or precious metals. Typically recorded in ounces per ton, or grams per tonne of specific metals, i.e., gold, silver, copper, zinc, etc.
To scientifically calculate the purity of metals in a bar or coin generally for gold, silver or platinum.
An analysis of a metal used to determine its purity. A series of assays can be run to determine the alloys in the metal as well.
A laboratory test used to determine parameters such as the strength of a solution, the proportion of a compound in a mixture, the potency of a drug or the purity of a preparation
the examination of a compound or mixture in order to determine the amount of a certain component present (like finding out how many eggs are in a cake). An assay can also be used to describe the potency of a given drug when used in a pharmacological context. In toxicology, the term is used to describe a procedure where living cells (i.e. a cell culture) are used to determine the presence of a given chemical, while in virology an assay is used to establish the effectiveness of a virus on a particular host. [Source: Biotechnology Industry Organization, www.bio.org
Another word for a laboratory test. (example: HIV drug resistance assay)
A test to analyse or quantify a substance in a sample.
An analysis performed on a rock sample to determine its metal content.
A means of estimating the concentration of a substance of clinical relevance to help the practitioner diagnose the origin of a set of symptoms. The results can be either quantitative (for example, the proportion of red cells in a given quantity of blood) or qualitative (generally a "yes" or "no" answer as in the case of a pregnancy test).
an analytical test or procedure to characterize or quantify some aspect of a chemical, material or other substance.
An assay is a test of the purity of an alloy. A tiny piece of metal is scraped from the piece and the percentage of gold or silver is determined. Official assay offices determine whether a piece qualifies for an appropriate hallmark.
A test of the composition, purity, weight, etc., of metals or metallic substances such as ores or alloys.
An analysis of an ore sample, streambed sample, or a gold sample to determine the proportions of gold, silver, platinum, and other valuable metals, to the amount of waste material present in the sample.
a test to determine the metallic content of a coin or bar.
A laboratory technique to quantitatively test an immune response
The analysis of a substance or mixture to determine its constituents and the relative proportion of each.
The physical and chemical analysis of something to decide on its constituent parts and what percentage of the whole each individual substance takes up.
The test made to prove that metal is of the required quality.
A medical term meaning "test."
Experimental test or analysis
a chemical solution that is used to determine the presence of a certain substance in fluid
A method/procedure for detecting the presence, estimating the concentration, and determining the biological activity of a macromolecule, molecule, ion, or cell. Features of an assay include: sensitivity, the ability to detect small amounts of a substance or molecule and specificity, the ability to detect only the analyte. Assays employ measurable parameters that allow for the evaluation of differences between samples and controls.
Analytical procedure to determine purity, concentration, or biological activity of a specific substance in a mixture. In drug discovery, an assay is performed to determine the relative affinity that a ligand has for its respective target.
The analysis of minerals, rocks and mine products to determine and quantify their constituent parts;
The evaluation or testing of a substance for toxicity, impurities, or other variables.
A test for a particular chemical or effect.
Analysis of a substance, or of components in a mixture, or of the biological, chemical, or pharmacological potency of a drug. Forms of assay include: Endpoint assay — a single measurement is made at a fixed time. Kinetic assay — increasing amounts of a product are formed with time, and are monitored at multiple points. Microbiological assay — measurement of the concentration of antimicrobials in biological material. Immunological assay — analysis or measurement is based on antigen-antibody reactions.
There are many types of immunological assays, including agglutination, complement-fixation, precipitation, immunodiffusion, and electrophoretic assays. Each type of assay utilizes either a particular type of antibody or a specific support medium (such as a gel) to determine the amount of antigen present.
Indicators are attached to the antigen or to the antibody to demonstrate that the antigen-antibody reaction has occurred. These assays have enabled measurement of many substances not previously measurable. Among these assays are: Enzyme immunoassay (EIA), Enzyme-linked immunosorbent assay (ELISA), Enzyme-multiplied immunoassay technique (EMIT), Fluorescence immunoassay (FIA), Fluorescence polarization immunoassay (FPIA) andRadioimmunoassay (RIA).
A test of the purity of an alloy by scraping a bit of metal from the piece and determining the percentage of gold or silver. A piece that meets the standards of purity is given a hallmark for use outside of the U.S.
Test of precious metal purity or fineness.
A laboratory assessment of the characteristics of a crude oil that help determine its market value and refining capabilities. Assays of some kind are usually required as part of all crude oil sales.
A chemical analysis of a substance to determine its components.
Means of determining, by analysis, quantities of metals in ore samples.