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.
exists and is an alternate of . M. Lomonosov and A. Lavoisier are credited for the enunciation of the law of conservation of mass: but many other were involved in this discovery, from the antiquity to XIXth century and this case is common for many discoveries.