{"thcode":2,"term":{"code":619,"name":"laboratory methods","parent":734,"scope":"Techniques to analyze and test samples in a place equipped and designed for the work."},"uf":[],"bt":[{"code":734,"name":"methods","parent":1,"scope":"Techniques, methods, procedures, or strategies for research, management, collection, or analysis of scientific information in USGS."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[{"code":955,"name":"Raman spectroscopy","parent":619,"scope":"Non-destructive chemical analysis technique in which a sample of material is irradiated with visible or near-infrared light from a laser, and the wavelength-dependent observations are used to understand chemical structure, phase and polymorphy, crystallinity and molecular interactions of the material."},{"code":1680,"name":"age estimation methods","parent":619,"scope":"Methods used to determine the age of earth materials, typically by laboratory analysis of properties of those materials."},{"code":1670,"name":"camera calibration","parent":619,"scope":"Optical calibration of cameras that are typically used in airborne remote sensing."},{"code":153,"name":"chemical analysis","parent":619,"scope":"Chemical techniques used to identify the composition of substances."},{"code":212,"name":"core analysis","parent":619,"scope":"Study of the composition and layers of cylindrical samples of rocks, trees, ice, and other materials extracted by drilling into a mass. Intended for broad use for the analysis of all types of core samples. The combination of this term with other terms will convey the context of the activity."},{"code":224,"name":"culturing (specimens)","parent":619,"scope":"Growing microorganisms, tissue cells, or other living matter in a specially prepared nutrient medium for diagnostic or scientific use."},{"code":370,"name":"faunal and floral census (microscopic)","parent":619,"scope":"Records of counts of the different microscopic species in a core, soil, sediment, rock or water sample to determine geologic age or other characteristic of the sample.  Use for microscopic examinations."},{"code":493,"name":"grain-size analysis","parent":619,"scope":"Method of studying soils, sediments, sands, or rock by determining the size, distribution, and proportion of selected particles."},{"code":609,"name":"isotopic analysis","parent":619,"scope":"Experimental determination of the proportion of a given isotope (or isotopes) in a sample."},{"code":2088,"name":"laboratory experiments","parent":619,"scope":"Procedures carried out in a laboratory under controlled conditions to test specific scientific hypotheses."},{"code":721,"name":"meristics","parent":619,"scope":"Branch of zoology concerned with classifying animals by counting and measuring body parts."},{"code":740,"name":"microscopy","parent":619,"scope":"Laboratory methods using instruments that employ optical lenses or radiation to study objects too small to be seen by the naked eye."},{"code":860,"name":"paleomagnetic analysis","parent":619,"scope":"Determination of the intensity and direction of residual magnetism in rocks to study changes in the earth's magnetic field during past geologic time."},{"code":880,"name":"petrography","parent":619,"scope":"Use of optical microscopy for the description and classification of rocks."},{"code":907,"name":"plant and animal testing","parent":619,"scope":"Use of live or dead organisms for scientific study."},{"code":2082,"name":"subsampling","parent":619,"scope":"Preparation of study materials by dividing or slicing cores, samples, or other collected materials."},{"code":1160,"name":"therapeutic methods","parent":619,"scope":"Methods of  restoring health with remedial agents or treatments."},{"code":1188,"name":"tree ring analysis","parent":619,"scope":"Study of the variations in width and number of tree rings to date historical events and to study periods of climatic and hydrologic changes."}],"rt":[]}