serw-MX  [xml]  

 DeCS Categories

D01 Inorganic Chemicals .
D01.248 Electrolytes .
D01.268 Elements .
D01.268.150 Carbon .
D01.268.150.200 Diamond .
D01.268.556 Metals, Heavy .
D01.268.557 Metals, Light .
D01.552 Metals .
D01.552.544 Metals, Heavy .
D01.552.547 Metals, Light .
D01.578 Minerals .
D01.578.750 Silicon Dioxide .
D01.578.750.600 Quartz .
D01.650 Oxygen Compounds .
D01.650.550 Oxides .
D01.650.550.825 Silicon Dioxide .
D01.650.550.825.600 Quartz .
D01.786 Salts .
D01.837 Silicon Compounds .
D01.837.725 Silicon Dioxide .
D01.837.725.600 Quartz .
D02 Organic Chemicals .
D02.092 Amines .
D27 Chemical Actions and Uses .
D27.720 Specialty Uses of Chemicals .
D27.720.844 Solvents .
E01 Diagnosis .
E01.370 Diagnostic Techniques and Procedures .
E01.370.350 Diagnostic Imaging .
E01.370.350.350 Image Interpretation, Computer-Assisted .
E01.370.350.350.800 Tomography, Emission-Computed .
E01.370.350.350.800.800 Tomography, Emission-Computed, Single-Photon .
E01.370.350.600 Photography .
E01.370.350.600.350 Image Enhancement .
E01.370.350.600.350.800 Tomography, Emission-Computed .
E01.370.350.600.350.800.800 Tomography, Emission-Computed, Single-Photon .
E01.370.350.710 Radionuclide Imaging .
E01.370.350.710.800 Tomography, Emission-Computed .
E01.370.350.710.800.800 Tomography, Emission-Computed, Single-Photon .
E01.370.350.825 Tomography .
E01.370.350.825.800 Tomography, Emission-Computed .
E01.370.350.825.800.800 Tomography, Emission-Computed, Single-Photon .
E01.370.384 Diagnostic Techniques, Radioisotope .
E01.370.384.730 Radionuclide Imaging .
E01.370.384.730.800 Tomography, Emission-Computed .
E01.370.384.730.800.800 Tomography, Emission-Computed, Single-Photon .
SP4 Environmental Health .
SP4.011 Science .
SP4.011.087 Contamination .
SP4.011.087.723 Environmental Pollutants .
SP4.011.087.723.474 Inorganic Pollutants .
SP4.011.087.723.474.315 Metals, Heavy .
SP4.011.092 Toxicology .
SP4.011.092.758 Metals, Heavy .
SP4.011.097 Chemistry .
SP4.011.097.036 Organic Chemicals .
SP4. Amines .
SP4.011.097.141 Solvents .
SP4.016 Water Resources .
SP4.016.177 Water Pollution .
SP4.016.177.038 Water Pollutants .
SP4. Metals, Heavy .
 Synonyms & Historicals
Metals, Light .
Light Metals .
Metals with low specific gravity, typically smaller than 5, characterized by a single valence (1, 2, or 3), a simple spectrum, strong electromotive force (positive), and colorless compounds. (From Grant & Hackh's Chemical Dictionary, 5th ed) .
Metals, Heavy .
Heavy Metals .
Metallic Pollutants .
Toxic Metals .
Metals with high specific gravity, typically larger than 5. They have complex spectra, form colored salts and double salts, have a low electrode potential, are mainly amphoteric, yield weak bases and weak acids, and are oxidizing or reducing agents (From Grant & Hackh's Chemical Dictionary, 5th ed) .
Salts .
Substances produced from the reaction between acids and bases; compounds consisting of a metal (positive) and nonmetal (negative) radical. (Grant & Hackh's Chemical Dictionary, 5th ed) .
Electrolytes .
Substances that dissociate into two or more ions, to some extent, in water. Solutions of electrolytes thus conduct an electric current and can be decomposed by it (ELECTROLYSIS). (Grant & Hackh's Chemical Dictionary, 5th ed) .
Amines .
A group of compounds derived from ammonia by substituting organic radicals for the hydrogens. (From Grant & Hackh's Chemical Dictionary, 5th ed) .
Quartz .
Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed) .
Solvents .
Liquids that dissolve other substances (solutes), generally solids, without any change in chemical composition, as, water containing sugar. (Grant & Hackh's Chemical Dictionary, 5th ed) .
Diamond .
Diamonds .
Diamond. A crystalline form of carbon that occurs as hard, colorless or tinted isomeric crystals. It is used as a precious stone, for cutting glass, and as bearings for delicate mechanisms. (From Grant & Hackh's Chemical Dictionary, 5th ed) .
Tomography, Emission-Computed, Single-Photon .
Single-Photon Emission CT Scan .
Single-Photon Emission Computer-Assisted Tomography .
Single-Photon Emission Computerized Tomography .
CAT Scan, Single Photon Emission .
CT Scan, Single Photon Emission .
Emission-Computed Tomography, Single-Photon .
Radionuclide Tomography, Single Photon Emission Computed .
Single Photon Emission CT Scan .
Single Photon Emission Computed Tomography .
Single Photon Emission Computer Assisted Tomography .
Single Photon Emission Computerized Tomography .
Tomography, Single-Photon Emission-Computed .
CAT Scan, Single-Photon Emission .
CT Scan, Single-Photon Emission .
Radionuclide Tomography, Single-Photon Emission-Computed .
Single-Photon Emission-Computed Tomography .
Tomography, Single-Photon, Emission-Computed .
A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image. .
Metals .
Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant & Hackh's Chemical Dictionary, 5th ed) .