If you do smoke frequently, expect to test positive on a marijuana drug screen for anywhere from 3 weeks to almost 2 months. If you smoke everyday or several times a day, you can test positive for 2 months or more. Detection times also vary depending upon your weight, metabolism, and other person factors.
Definition: A transducer is a device that converts one form of energy â typically a signal â into another. Example: A speaker is a type of transducer that converts electrical energy (the audio signal) into mechanical energy (vibration of the speaker cone/diaphragm).
Signal transduction will involve a receptor for the first messenger and may involve both transducers and effectors. In the field of receptors, a transducer may be defined as a molecule that translates one form of energy (e.g., the neurotransmitter) into another form, the second messenger. Effector is a molecule that mediates a specific effect (e.g., an ion channel).