1.0 milliseconds -- cycle time for frequency 1 kHz
1 ms -- duration of light for typical photo flash strobe
2.27 ms -- cycle time for the A above middle C in music (440 Hz). If an electric tuning device for musical instruments generates just one tone, this is probably that tone.
... are bacteria which use hydrogen sulfide instead of water in their photosynthetic pathway:
CO2 + 2 H2S → CH2O + H2O + 2S
Some of these produce globules of sulfur ...