The vivaciousness of
do you mean vivacity :)
the essay fits ok with the prompt because it's talking about how you learned something new and how your interest in science was reinvigorated.
it provides a good look into your interests and qualities, but i feel like you almost are writing an essay about an influential person (that doesn't really matter though because Dr. Crenshaw conributed to your intellectual vitality i guess).
She spoke ardently of her graduate work on Sickle-cell anemia, a disease that had claimed the life of her childhood friend and mused her ever since. Her passion was contagious, and it certainly affected me.
maybe you could take out the blue part because it doesn't have anything meaningful about you. and then comine those two sentences: "... work on sickle cell anemia, and her passion was contagious." or "...and her passion certainly affected me."
please take a look at my kpop essay if you have time!