Chemotaxis (from chemo- + taxis) is the movement of an organism in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment.
It will be good for up to six months, in the vacuum seal, if stored in the refrigerator. If frozen in the vacuum seal, it can last for about 1 year. Once the sample is removed from the vacuum seal, it should not remain at room temperature for more than 18 hours. It will keep in the refrigerator, unsealed, for 30 days.
Confidence votes 821. THC is non-existent in urine, when screening for urine it is only the metabolites and byproducts of the drug that are tested for. For a frequent user, the substance may stay in the system up to 40 days after abstaining from use of cannabis or cannabis containing substances. For seldom users, the detection period is from 2-10 days.