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.
Sforza was a ruling family of Renaissance Italy, based in Milan. They acquired the Duchy of Milan from the previously ruling Visconti family in the mid-15th century, and lost it to the Spanish Habsburgs about a century later. condottiero from Romagna, he served the Angevin kings of Naples and became the most successful dynast of the condottieri. His son Francesco I Sforza ruled Milan, having acquired the title of Duke of Milan (1450-1466) after the extinction of the Visconti family in 1447.