Radioactive tracer such as a cell or tissue, or as a flow tracer to track fluid flow. Radioactive tracers are also used to determine the location of fractures created by hydraulic fracturing in natural gas production. Radioactive tracers form the basis of a variety of imaging systems, such as, PET scans, SPECT scans and technetium scans. Radiocarbon dating uses the naturally occurring carbon-14 isotope as an isotopic label. Isotopes of a chemical element differ only in the mass number. For example, the isotopes of hydrogen can be written as H, H and H, with the mass number at top left. When the
Guar gum for humans and animals. Because it is gluten-free, it's also used as an additive to replace wheat flour in baked goods. It has also been shown to be beneficial to health. It has been shown to reduce serum cholesterol and lower blood glucose levels. Additional benefits have been seen in one's efforts to lose weight where, when ingested, its water-absorbing properties cause it to swell in the stomach giving one that 'full' sensation sooner. Guar gum is economical as well. Because it has almost eight times the water-thickening ability of other agents, cornstarch for example, only a very small quantity