# Biological Physics with New Art by David Goodsell: Errata

"The laws of nature will defend themselves;--but error--(he would add,
looking earnestly at my mother)--error, Sir, creeps in thro' the minute
holes and small crevices which human nature leaves unguarded." -- Laurence
Sterne, *Tristram Shandy*

The current version of the book is the 8th printing (2017).
I'll be grateful to hear of any errors not already on this list.

Thanks, Philip Nelson

## Errata to the 5th printing:

### Big corrections:

Figure 7.10: Both in the figure and in the caption, the curve that rises on the left involves the charge density divided by the proton charge e, not the permittivity epsilon, as seen from eq 7.29.
### Clarifications and small corrections:

Chapter 1 further reading: the web site www.biopyhsics.org/btol/ has been discontinued.

Fig 2.24: The caption states that initiation and elongation factors are not shown. Actually, they are visible flanking the tRNA at the lower left of the figure.

Problem 2.4: The web site listed has been discontinued. Use http://ligand-expo.rscb.org .

Problem 2.5: The web site persweb.wabash.edu/facstaff/fellers/ has been discontinued.

Example solution on page 209: In part (b),
The temperature T should be replaced by the larger final temperature T_eq. Moreover, the force f should be replaced by the smaller f_eq (force decreases as the spring extends).

Problem 7.7 is stated in a potentially misleading way. You are to expand each of the exponentials on the right side of the Poisson-Boltzmann equation out to linear order in the potential function.

Problem C.6.13:
Remark: In this problem, you are asked to treat the electromagnetic field as a plane wave and the bead's response as a point electrostatic dipole. Neither of these approximations is accurate for visible light with beam width and particle diameter as given in the problem, so your answer will not be quantitatively precise. However, this approach to the problem does give the right order of magnitude for the force, and explains why any transverse force at all will arise.
### Spelling etc:

Page 265 fig 7.8 caption: Behavior of counterionS.

Page 524 Fig 12.7 labels: subscript the ion names, not superscript.

Page 528, second line from the top: (Figure 12.5a on page 519)

Page 528, below eq 12.20, "page 514" should be "page 515".