We give an overview of the literature on ionization front structure and propagation and comment on recombination front structures. We discuss the formation of cometary tails by photoionization of globules and note the importance of including the diffuse component of the ionizing radiation field. We finally briefly comment on the formation of small scale structures in H II regions.

In the preceding Comment it is alleged that a " hidden loophole " in the proof of Hara's theorem has been found, which purportedly invalidates the conclusions of the paper commented upon. I show that there is no such loophole in the constituent quark model, and that the " counterexample " presented in the Comment is not gauge invariant.

We show that the criticism of a recent comment [1] on the insecurity of a quantum secret sharing protocol proposed in [2] is based on a misconception about the meaning of security and hence is invalid. The same misconception also appears in another comment of the authors [3] on the security of an entangled-based quantum key distribution protocol [4, 5].

In this Comment, we point out that the Euler-Lagrange equations, which are referred to as the general equilibrium equations by Zhao et al. [Phys. Rev. E 74, 032801 (2006)] are incorrect along with the equations which are derived from them. The correct equations are provided in this Comment. We produce new numerical results with the use of the correct equations.

When the editor invites comment on a response to an analysis of a criticism of a protocol already defended by the author in this journal, the issue is clearly contentious. I will comment briefly on Thomas's paper in this issue of the journal, and look at points of agreement as well as dissent.

This is a comment on the previously published paper "Enhancement of nonlinear optical properties of BaTiO3 nanoparticles by the addition of silver seeds," [Opt. Express20, 26511 (2012)10.1364/OE.20.026511]. An erroneous equation given in the manuscript is corrected with a more accurate equation in this comment.

COMMENT. The authors comment that the benefit in persistent migraine relief rates found for dexamethasone in this study should be interpreted with caution because this was a subgroup analysis. Becker WJ, Kryscio RJ, in an editorial (Neurology 2007;69:2034-2035), note that others have reported benefits of dexamethasone, especially with larger doses and with headache endpoints beyond 24 hours pos...

We respond to the comment submitted by Xian Feng on our recent Letter, Opt. Lett.38, 4679 (2013). The comment addressed the attenuation of our oxide tellurite glass labeled TWPN/I/6. We provide the originally measured absorbance spectrum of the glass and correct values of its mid-infrared attenuation.