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.
Contagion theory is a theory of collective behavior which explains that the crowd can cause a hypnotic impact on individuals. The theory is first developed by Gustave Le Bon in his book called âthe crowd: a study of popular mind in Franceâ in 1885. As a historian and philosopher his works reflected more of political and social opinions.