Dr. broncho used an afm system with a spherical indenter tip (diameter 0.8 um) to probe the stiffness of the cultured mesenchymal stem cells. he measured a cell indentation of 0.08 jum under the quasi-static load of 80 pn. assume the poisson's ratio for these cells are 0.45 (a) estimate the young's modulus of these stem cells. (b) dr. broncho then treated these cells with cytochalasin d and did the similar afm test again, he found that only 28-pn load was needed to cause 0.08 am indentation on the treated cells. dr. broncho determine the young's modulus of the treated cells. briefly describe why this result is quite different compared with the value for untreated cells. (c) if dr. broncho wants these cells to become osteoblast-like cells after culture, what would be the magnitude of the elasticity of the substrate he needs to use? why?

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

If i add water to oil what will happen

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2