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Liposomes are promising molecules in gene transfer technology because of their similarity to cell membranes and their charge interactions with negatively charged DNA. Estimate the charge on the outside surface of a liposome of diameter 1 um. Suppose a typical phospholipid head has a diameter of 1 nm and carries a charge of one proton (1.6021 x 10^-19 C). Assume that the surface of the spherical liposome is comprised of phospholipid heads packed together as tightly as possible in a configuration known as hexagonal packing, which minimizes the inevitable vacant space that occurs when circles pack against one another.
a factory has a large liquid propane storage tank. the propane is to be used as vapor. evaporation of the liquid
At a section in a passage, the pressure is 150 kPa (abs), the temperature is 10 deg C, and the speed is 120 m/s. For isentropic flow of air, determine the Mach number at the point where the pressure is 50 kPa (abs). Sketch the passage shape.
determine the mass of methane gas stored in a 2 m3 tank at ?30degc 3 mpa. estimate the percent error in the mass
two steel plates a572 fy 50ksi are welded together to form an inverted t-beam. determine the maximum bending stress
there are two gears one with radius r and the other with radius 2.2r. the larger hear is subjected to an external
a steady flow centrifugal compressor is supplied with saturated water vapor at 15kpa and 500kg of the water is
in a tempering process glass plate which is initially at a uniform temperature ti is cooled by suddenly reducing the
an air conditioning unit with refirigerant-134a as the working fluid is used to keep a room at 26 degrees celcius by
a machine of total mass 100 kg is mounted on a suspension which has a static deflection under the weight of the machine
A bird flying at a constant speed at an altitude 100 m is being tracked by a person located directly below the line of flight. If this angle is decreasing at 0.02 rad/s when the angle between the horizon line and the line of site is 45 degrees.
with a sphygmomanometer as pressure is released the height of the mercury column is recorded at two points as blood
a 50-cm diameter pipeline in the arctic carries hot oil at 30 degrees celsius and is exposed to a surrounding
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