Rigour (BrE) or rigor (AmE) (see spelling differences) describes a condition of stiffness or strictness. Rigour frequently refers to a process of adhering absolutely to certain constraints, or the practice of maintaining strict consistency with certain predefined parameters.
PLA stands for polylactic acid and is a resin made from corn starch. PLA is used to make clear compostable containers and PLA lining is used in cups and containers as an impermeable liner. PLA is biodegradable, and fully compostable. It uses 65 percent less energy to produce than conventional oil-based plastics and generates 68 percent fewer greenhouse gasses and contains no toxins.
The CEA test may be used: 1  To monitor the treatment of people diagnosed with colon cancer. 2  It may also be used as a marker for medullary thyroid cancer and cancers of the rectum, lung, breast, liver, pancreas, stomach, and ovaries.3  An initial CEA test is typically ordered prior to treatment as a baseline value. An initial CEA test is typically ordered prior to treatment as a baseline value. 2  If the level is elevated, then the test can be used to monitor a person's response to therapy and to determine whether the cancer has progressed or recurred.