SPECT : KMLE 의학 검색 엔진 - 의학사전, 의학용어, 의학약어, 의학논문, 약품/의약품 검색

MeSH(Medical Subject Headings) 맞춤 검색 (http://www.nlm.nih.gov) 결과 : 5 페이지: 2

Spectrometry, Mass, Electrospray Ionization - 새창 A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry.
Synonyms : Mass Spectrometry, ESI, Spectrometry, ESI Mass
Spectrometry, Mass, Fast Atom Bombardment - 새창 A mass spectrometric technique that is used for the analysis of a wide range of biomolecules, such as glycoalkaloids, glycoproteins, polysaccharides, and peptides. Positive and negative fast atom bombardment spectra are recorded on a mass spectrometer fitted with an atom gun with xenon as the customary beam. The mass spectra obtained contain molecular weight recognition as well as sequence information.
Synonyms :
Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization - 새창 A mass spectrometric technique that is used for the analysis of large biomolecules. Analyte molecules are embedded in an excess matrix of small organic molecules that show a high resonant absorption at the laser wavelength used. The matrix absorbs the laser energy, thus inducing a soft disintegration of the sample-matrix mixture into free (gas phase) matrix and analyte molecules and molecular ions. In general, only molecular ions of the analyte molecules are produced, and almost no fragmentation occurs. This makes the method well suited for molecular weight determinations and mixture analysis.
Synonyms : MALDI-MS, MS-MALD, SELDI-TOF-MS, Surface Enhanced Laser Desorption Ionization Mass Spectrometry, Laser Desorption Ionization Mass Spectrometry, Matrix Assisted, MALDI MS, Mass Spectrometry, Matrix Assisted Laser Desorption Ionization
Spectrometry, Mass, Secondary Ion - 새창 A mass-spectrometric technique that is used for microscopic chemical analysis. A beam of primary ions with an energy of 5-20 kiloelectronvolts (keV) bombards a small spot on the surface of the sample under ultra-high vacuum conditions. Positive and negative secondary ions sputtered from the surface are analyzed in a mass spectrometer in regards to their mass-to-charge ratio. Digital imaging can be generated from the secondary ion beams and their intensity can be measured. Ionic images can be correlated with images from light or other microscopy providing useful tools in the study of molecular and drug actions.
Synonyms : Secondary Ion Mass Spectroscopy, Secondary Ion Mass Spectroscopy Microscopy
Spectrometry, X-Ray Emission - 새창 The analysis of the spectrum of fluorescent X-RAYS, i.e. X-rays emitted after bombarding matter with high energy particles such as PROTONS; ELECTRONS; or higher energy X-rays. The identification and quantitation of ELEMENTS by this technique is based on the fact that the wavelength and intensity of the fluorescent X-rays are characteristic of specific elements and the concentration of the elements in the matter being analyzed.
Synonyms : Particle Induced X Ray Emission Spectrometry, Proton Induced X Ray Emission Spectrometry, Spectrometry, Particle Induced X Ray Emission, Spectrometry, Proton Induced X Ray Emission, Spectrometry, Xray Emission, Xray Emission Spectroscopy