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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.
determine the maximum theoretical speed that may be achieved over a distance of 360ft by a car of weight w starting
the african elephant has developed the pinna or external ear that functions as a radiator-convector. the pinna can be
a solid object of aisi 302 steel at a temperature of 850?c is quenched in mineral oil at a temperature of 25?c. the oil
estimate the annual emissions of co2 and so2 from a 1500 mwth steam generation plant if the boiler operates at 1800 k
a machine of mass 20 kg is acted upon by a harmonic force having a maximum value of 25 n at a frequency of 120
An electronics company has a contract to deliver
tank a initially contains 100 gallons of pollutant and no water. pure water flows from a source to tank a at a rate of
the top cycle of a combined cycle power plant has a pressure ratio of 12. air enters the compressor at 300 k at a rate
Cantilever Beam with maximum tensile strength. A cantilever beam is to be made using a symmetrical I section beam. The cantilever is to carry a load of 40kN at a distance 2.5m from the fixed end. The situation allows for a depth of I beam to be no..
a gas is contained in a vertical frictionless piston-cylinder device. the piston has a mass of 4kg and a cross
initially 0.05 kg of air is contained in a piston-cylinder device at 200 degc and 1.6 mpa. the air then expands at
The roof is supported by cables. If the cables exert FAB = 100N and FAC = 120N on the wall hook at A, determine the magnitude of the resultant force acting at A.
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