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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 rigid tank has a volume of 23.3 m^3 and due to safety requirements its pressure should not exceed 105 bar. If the tank has been filled with 1000kg of water vapor and is heated to 360°C check to see if it is within safety requirements.
an old fashioned glass apothecary jar contains a patent medicine. the neck is closed with a rubber stopper that is 20
An ogee spillway of a gravity dam is to be modeled using water. The spillway section is 40 feet high, its crest length is 60 feet and the maximum discharge is 3,000 CFS when the head on the crest of the spillway is 5 feet. Using a model scale of 1:10..
Gravitational forces pull the two stars together. What is the speed of each star at the moment of impact?
The maximum flow past a circular cylinder is 2 X the Up stream velocity. The max velocity occurs at the center line of the top of the cylinder.
a single-pass cross flow heat exchanger shown below is utilized to transfer heat from fluid a to fluid b. right after
find the isentropic and the second law efficiencies for a turbine. it receives steam at 3000 kpa 500c and has two exit
State the sequence in which the cylinders operate on the operation of the start valve and show, with the aid of a schematic diagram, how an electronic controller could be included in the circuit to control the sequence of cylinder operations.
An airplane flies at 400 mph at 1600 ft altitude on a standard day. The plane climbs to 50,000 ft and flies at 725 mph. Calculate the Mach number of flight in both cases.
a steam plant uses 3.045 tonne of coalh. the steam is fed to a turbine the output of which is 4.1 mw. the calorific
water is pumped at a rate of 1.57 cfs from one large open tank into another through a 6 in diameter cast iron pipe 400
a concentric tube heat exchanger uses water which is available at 15?c to cool ethylene glycol from 100 to 60c. the
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