# Biological Physics: Errata to the updated first edition

"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 5th printing (2014).
This list will grow as errata are found.
I'll be grateful to hear of any errors not already on this list.

Thanks, Philip Nelson

## Errata to the 5th printing:

### 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.

## Errata to the 4th printing:

### Clarifications and small corrections:

On page 36, and elsewhere, a human striated muscle cell is called a "myofibril". Actually, in mammal Anatomy and Physiology, a striated muscle cell is called a muscle fiber, a myocyte or a myofiber. A "myofibril" is actually a component of a myofiber, a bundle of actin and myosin filaments. Many of these form the contractile apparatus in myofibers. (http://en.wikipedia.org/wiki/Myofibril; thanks to Vasco Fachada).

On page 199, perhaps the statement of the Statistical Postulate would be clearer like this:
"Rather, AMONG ALL POSSIBLE PROBABILITY DISTRIBUTIONS OF MICROSTATES, EQUILIBRIUM IS THE ONE THAT HAS the greatest possible disorder allowed by..."
On page 464, Figure 10.30: Horizontal axis label should read
"1000/T, K^{-1}." It may not be obvious, but this is a semilogarithmic plot.
### Spelling etc:

On page 269: "10^9 k_BT" should be "10^9 k_BT_r."

On page 358: "such a effect" should be "such an effect".

On page 415 "... same mechaism" should be "... same mechanism".