The TTL output stage is a rather complicated pushâpull circuit known as a totem-pole output (the transistors, diode, and resistor in the right-most slice of this TTL logic gate circuit). It sinks currents better than it sources current.
The theory for spontaneous generation refers to the idea that life can produced from nonliving things. Lazzaro Spallanzani proposed in his experiement that air was necessary for spontaneous generation.
The term Caravaggism describes the techniques of tenebrism and chiaroscuro popularized by the radical Italian Mannerist painter Michelangelo Merisi da Caravaggio (1571-1610), and used by him in his religious art, genre paintings and still life, which was subsequently widely adopted by other contemporary artists in Italy and across Europe.