The most commonly used diagnostic tool for tuberculosis is a simple skin test, though blood tests are becoming more commonplace. A small amount of a substance called PPD tuberculin is injected just below the skin of your inside forearm. You should feel only a slight needle prick.
The structure has a double bond and an adjacent atom with a lone pair, so it could have resonance. The possible resonance structures are below. The first structure has the most common bonding pattern for all of its atoms, so it is a reasonable Lewis structure.
In physics, resonance is the tendency of a system to oscillate at maximum amplitude at certain frequencies, known as. the system's resonance frequencies (or resonant frequencies). At these frequencies, even small periodic driving forces. can produce large amplitude vibrations, because the system stores vibrational energy. When damping is small, the.