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.
Lazzaro Spallanzani (10 January 1729 - 12 February 1799) was an Italian biologist and physiologist who made important contributions to the experimental study of bodily functioâ¦ns, animal reproduction, and essentially discovered echolocation. His research of biogenesis paved the way for the investigations of Louis Pasteur.