BIOL 1201 Lecture : Bad Sleeping Notes 1
Document Summary
Scientists: employ a variety of techniques to investigate the natural world, make their explanations public through presentations and publications, critique the explanations proposed by other scientists. Our typical experience: body temperature 37c, 1 atm pressure. Range of conditions of life: cell/body temperatures from -2c to 132c, range pressures 1 atm to 1100 atm, conditions at the average depth of the ocean 2c to 4c, 380atm pressure, no sunlight. Antarctic fishes: fishes with -2c body temperature, ectatherms. Penguins: keep warm at similar temperatures, endotherms. Diving seals: holding breathe for as long as 90 minutes, dive down to 1500 m for as long as 90 min. Deep-sea fishes: down 7000m, high pressure, cold temperature, low food availability. Piezophiles: bacteria, barophiles, pressure loving, thrive at pressure that kill surface bacteria. Thermophiles: bacteria at temperatures up to 132c grow at 122c, hydrothermal vents. Live in molar urea in their tissues: endotherm. Halophiles: halophilic bacteria live in osmotic equilibrium with 3 molar salt.
