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 Contributions of Mazzini, Garibaldi and Cavour in the Unification of Italy were as follows: Mazzini. (i) He was the founder of the Young Italy movement with the aim of ending Austrian rule over Italy and to make it a Republic. (ii) He wanted unification through a democratic revolution but his lofty ideals were not supported by the peasants and middle classes.