Regular order reductions of ordinary and delay-differential equations

We present a C program to compute by successive approximations the regular order reduction of a large class of ordinary differential equations, which includes evolution equations in electrodynamics and gravitation. The code may also find the regular order reduction of delay-differential equations.Comment: 4 figure

Exact Solution of the Landau-Lifshitz Equations for a Radiating Charged Particle in The Coulomb Potential

We solve exactly the classical non-relativistic Landau-Lifshitz equations of motion for a charged particle moving in a Coulomb potential, including radiation damping. The general solution involves the Painleve transcendent of type II. It confirms our physical intuition that a negatively charged classical particle will spiral into the nucleus, supporting the the validity of the Landau-Lifshitz equation.Comment: 2 figures; Figure added, also minor comments and correction

Orientation and dynamics of transmembrane peptides: the power of simple models

In this review we discuss recent insights obtained from well-characterized model systems into the factors that determine the orientation and tilt angles of transmembrane peptides in lipid bilayers. We will compare tilt angles of synthetic peptides with those of natural peptides and proteins, and we will discuss how tilt can be modulated by hydrophobic mismatch between the thickness of the bilayer and the length of the membrane spanning part of the peptide or protein. In particular, we will focus on results obtained on tryptophan-flanked model peptides (WALP peptides) as a case study to illustrate possible consequences of hydrophobic mismatch in molecular detail and to highlight the importance of peptide dynamics for the experimental determination of tilt angles. We will conclude with discussing some future prospects and challenges concerning the use of simple peptide/lipid model systems as a tool to understand membrane structure and function

Risks Associated with Intramuscular Injections in the Dorsal Gluteal Site

All of the articles that were reviewed agreed that the dorsal gluteal injection site has risks and is not the best site for intramuscular injections. Four of the seven articles identified the possible risk of the dorsal gluteal intramuscular injection being injected into subcutaneous tissue instead of muscle. Five of the seven articles identified nerve damage as a potential risk to giving a dorsal gluteal injection. And one article mentioned the possibility of blood vessel damage. Two of the articles identified both nerve damage and injection into the subcutaneous tissue as a possibility in a dorsal gluteal injection. All of the articles reviewed suggested using the ventral gluteal site instead of the dorsal gluteal site for intramuscular injections in adults