(redirected from positive chemotaxis). Also found in: Dictionary/thesaurus, Medical, Wikipedia. see taxis taxis, movement of animals either toward or away from a stimulus, such as light (phototaxis), heat (thermotaxis), chemicals (chemotaxis), gravity (geotaxis), and touch (thigmotaxis). The turning movements of plants in response to stimuli are called tropisms...... Click the link for more information. .
USPS first class mail takes anywhere from 3 days to 14 days depending on when they process it, if the address is legible, etc.The average seems to be 7-10 days as of lately, unless you are shipping it within the same city.f it's international shipping, the only first class option is airmail which has no tracking and can take from 7-21 days. If you go with priority international mail, it's much more expensive - $15 and up-and takes around 7 days.
Re: USPS Priority Mail - Fast? â12-20-2012 08:37 PM. Had a U.S. seller ship an item Dec.8th 'First Class International' from California to Niagara ON (no shipping but does provide a 'scan' number as proof on U.S.P.S. tracking page that at least it has been accepted and sent), the package arrived Dec.19th.