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A strain of Escherichia coli has been genetically engineered to produce human protein. A batch culture is started by inoculating 12 g cells into a 100-1itre bubble-column fermenter
containing 10 g l- 1 glucose. The maximum specific growth rate of the culture is 0.9 h- 1; the biomass yield from glucose is 0.575 g g -1 .
(a) Estimate the time required to reach stationary phase.
(b) What will be the final cell density if the fermentation is stopped after only 70% of the substrate is consumed?
When 4g of sodium hydroxide (NaOH) was dissolved in 100g of water, a value of 10C was obtained for ?T. Calculate the value (calories) for the heat of solution of 4g of NaOH.
Give three reasons why spectrophotometric analyses are performed using a narrow wavelength band centered at ? max. Give the purpose of the following commands:
what is the maximum kinetic energy of a photo electron ejected from cesium by 555nm light? note that if the wavelength of the light used to irradiate the cesium surface become longer than 600 nm, no photoelectrons are emitted.
Ferrophosphorus reacts with pryite producing iron(II) sulfide and a compound that is 27.82% P and 72.13% S by mass and has a molar mass of 444.56 g/mol. a) determine the empirical and molecular formulas of this compound. b) Write a balanced chemic..
use a sketch to show the change that occurs as a sulfur atom becomes a sulfide ion. describe how the distance from the
If the container is compressed to 2.40 L and the temperature is increased to 36 degree celsius, what is the new pressure,P2 , inside the container? Assume no change in the amount of gas inside the cylinder.
How many electrons can be removed from element 79 before it is reduced to its core electron configuration? For the purposes of this question, the core electron configuration is the configuration of the next lightest rare gas atom.
Compute the molar mass of vitamin C if a solution of 22.7 g in 100. g of water freezes at -2.40 oC. The Kf of water is 1.858 oC kg/mol.
Presume complete dissociation of the solute, Explain how many grams of KNO3 must be added to 275mL of water to produce a solution that freezes at -14.5. The freezing point for pure water is 0.0 and Kf is equal to 1.86
100g of metal x (csp=.21 j/gC) at 200C is put into 55g of water (Csp=4.184j/gC) at 24C. what is the final temperature
Expalin how you would prepare 500.0mL of a solution that is 0.100 M of H2SO4 from concentrated 18.0 M of H2SO4, which is a liquid with density 1.82g/mL
A sample of nitrogen of mass 3.12 g at 23 C is allowed to expand reversibly and adiabatically from 400 cm^3 to 2 dm^3
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