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The flux (F) of a molecule present at concentration C through a circular hole of diameter d on a surface that is adjacent to a fluid that it is diffusing in is given by F = 4DdC
The total that can be transferred is the per pore capacity times the number of pores formed. Calculate the flux allowed though each pore if the diffusion coefficient is 106 cm2=sec, the concentration is 1 mM, and the pore diameter is 1.5 nm. Discuss your results and try to estimate how many pores are needed to reach meaningful cell-to-cell communications. With the per pore flux estimated above, derive the time constant for transfer of a metabolite from a particular cell to a neighboring cell. Assume that these are two epithelial cells whose geometry can be approximated as a box and that the two adjacent boxes are connected with transfer occurring through n pores.
Why is it important - where does galvanising fit into possible corrosion protection strategies?)
What results can be expected in the near-term? The mid-term? The long-term? Nanotech's development can usefully be divided into stages, for example:
For total yearly payments of $5000 for 10 years, compare the compound amount accumulated at the end of 10 years if the payments are (a) end-of-year, (b) weekly, and Cc) continuous. The effective (annual) interest is 20 percent and payments are uni..
HEAT TRANSFER PROBLEM NO 2O- The hot fluid flows through a well mixed stirred tank which is provided with a cooling jacket . the fluid in cooling jacket can also be assumed to be well mixed . what is the heat transfer area of the jacket required?
And if the reactant was in excess to the waste stream and was modeled with 2nd order kinetics equal to k = 1000 g-moles per liter minute --- what does this mean?
To be satisfactory quality the ratio of 'A' to 'B' in the mixture must be 100 to 1or higher. 'D' reacts with both 'A' and 'B' as follows;A + D?R-rA= 21 CACDB + D?S-rB= 147 CBCDAssuming that the reaction go to completion, how much 'D' need be added..
In a 1-1 shell and tube heat exchanger , steam is condensing on the shell side at Tso c and the cold fluid is being heated on the tube side from t1 oc to t2 oc . the following equation relates t2 to the other vari..
The product may bemobile or immobile; since the reaction is irreversible, it does not matter. Thisreaction shows the solute's penetration across the film. Write mass balancesfor the solute and the immobile reagent.
Large blooms of algae result from high nutrient loading in rivers and lakes, for example, as a result of runoff of fertilizers from agricultural fields.
She wishes to calculate a project's PW with estimated costs of $35,000 now and $7000 per year for 5 years beginning 1 year from now with increases of 10 % per year thereafter for the next 8 years. Use a real interest rate of 12% per year to make t..
Chemical Oxygen Demand (COD, microbiological quality of drinking waters, Oxygen Sag curves, landfill gas, integrated hazardous waste management plan
This is a fluid dynamics experiment involving the filling and emptying of tanks. The objectives of the experiment include: Determination of the discharge coefficient of the orifice and the equivalent length of a pipe mounted at the outlet of the two..
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