u' - marginal utility
u'' - related to risk aversion
u''' - related to precautionary saving (prudence)
u'''' - ??
I heard once that @mileskimball had intuition for the roles of 4th & higher-order derivatives of u() -- would love to be able to break that out at an Econ party
The derivatives of the Position vector with respect to time have interesting names:
— Fermat's Library (@fermatslibrary) October 19, 2018
Velocity (v) = change in Position
Acceleration (a) = change in Velocity
Jerk (j) = change in Acceleration
Snap (s) = change in Jerk
Crackle (c) = change in Snap
Pop (p) = change in Crackle
\U0001f9d0 pic.twitter.com/fo7RNjum6f
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Viruses and other pathogens are often studied as stand-alone entities, despite that, in nature, they mostly live in multispecies associations called biofilms—both externally and within the host.
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Viruses and other pathogens are often studied as stand-alone entities, despite that, in nature, they mostly live in multispecies associations called biofilms—both externally and within the host.
https://t.co/FBfXhUrH5d
Microorganisms in biofilms are enclosed by an extracellular matrix that confers protection and improves survival. Previous studies have shown that viruses can secondarily colonize preexisting biofilms, and viral biofilms have also been described.
...we raise the perspective that CoVs can persistently infect bats due to their association with biofilm structures. This phenomenon potentially provides an optimal environment for nonpathogenic & well-adapted viruses to interact with the host, as well as for viral recombination.
Biofilms can also enhance virion viability in extracellular environments, such as on fomites and in aquatic sediments, allowing viral persistence and dissemination.