Do the polymers shown in Question 8 undergo biodegradation? (write yes or no) If yes, which one of the two erosion mechanisms does each of the three polymers undergo in an aqueous solution?  If no, state how you could alter the material to allow biodegradation.  Please list a, b, and c and then your answers for each. a) b) c)

After characterizing structural morphology, you determine pore properties of the scaffolds and you find that the scaffold produced using the approach shown in Figure A in question 12 has two pore-related problems that make it unsuitable for tissue engineering use. What are the problems likely to be? 

Briefly explain why heterobifunctional linkers are preferable compared to homobifunctional linkers when conjugating a biomolecule to a tissue engineering scaffold surface:

Given the information in the previous questions regarding contact angle and the bioactivity of adsorbed proteins on each surface,  infer the relative amount of cell adhesion (in terms of number of cells adhered as lowest, highest, moderate/in the middle) you expect on each surface and EXPLAIN briefly why.   In your answer, please list A, B, and C with a specific answer for each. A –   B –   C –

In lecture, an example was shown and discussed that showed a greater percentage of cells with well-defined stress fibers on surfaces where peptides (of the same type) were conjugated to surfaces using star PEG (where more than one peptide was conjugated per PEG tether) rather than one-arm PEG (where only 1 peptide was conjugated per PEG tether), but the total peptide density was the same in both conditions.  What most likely contributed to the increase in well-formed stress fibers?  

List 2 reasons why we want scaffolds to degrade in tissue engineering.  Also, name 2 ways properties of a scaffold may change as it degrades.  

The images below show MSCs on two different surfaces (A and B).  Which material is more favorable for MSC adhesion?  Explain two reasons why you can conclude this.   

Alginate is a natural polysaccharide material that forms a very hydrophilic hydrogel that resists protein adsorption, yet due to being a natural material, mammalian cells will recognize it directly.

According to Gibbs Law of free energy:  ∆G = ∆H – T(∆ S)  In order for protein adsorption to occur spontaneously, ∆G must be a positive number.

During human embryonic development, the notochord goes on to become the brain and spinal cord.