The flashlight fish has an organ under its eye that emits light, which startles predators, attracts prey, and allows the fish to communicate with other fish. some species can rotate the organ, so the light appears to flash on and off. the light is actually emitted by bacteria that live in the organ in a mutualistic relationship with the fish. (the bacteria receive nutrients from the fish.) the bacteria must multiply until they reach a certain density in the organ, at which point they all begin emitting light at the same time. there is a group of six or so genes, called lux genes, whose gene products are necessary for light formation. given that these bacterial genes are regulated together, propose a hypothesis for how the genes are organized and regulated.

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w