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 other theory was the heliocentric or Copernican theory which held that the sun was the center of the universe and that day and night were due to the rotation of the earth. This theory was named after a Catholic canon, Nicolaus Copernicus, who published a book on it 21 years before Galileo was born.he other theory was the heliocentric or Copernican theory which held that the sun was the center of the universe and that day and night were due to the rotation of the earth. This theory was named after a Catholic canon, Nicolaus Copernicus, who published a book on it 21 years before Galileo was born.