Trickle-up theory (reverse adaptation) 1  It starts from street fashion to high fashion. 2  Since 1960s designers and manufactures pay more attention to the customers innovations 3  . They watch people on street to find ideas. 4  The âgypsyâ look is a good example of a street look which reached the runway.
Plague. Plague is an infectious disease caused by bacteria called Yersinia pestis. These bacteria are found mainly in rodents, particularly rats, and in the fleas that feed on them.Other animals and humans usually contract the bacteria from rodent or flea bites.ersinia pestis bacteria are found in animals throughout the world, most commonly in rats but occasionally in other wild animals, such as prairie dogs. Most cases of human plague are caused by bites of infected animals or the infected fleas that feed on them.
Y. pestis causes diseases through the bite of an infected rat or flea, but can also be transmitted by air. Fleas can become infected by taking the blood of other infected animals.Y. pestis grows in the midgut and eventually blocks the proventriculus, starving the flea for blood (1) .ell structure and metabolism. Yersinia pestis is a rod shaped gram-negative bacteria that can also have a spherical shape. It is also covered by a slime envelope that is heat labile. When the bacteria is in a host, it is nonmotile (incapable of self-propelled movement), but when isolated it is motile (1) .