Structural Changes Induced By Addition Of A Hydrocarbon To Water/amphiphile Mixtures

The phase conditions in a system of water, hexadecane, sodium dodecyl sulphate, and di-ethylene glycol dodecyl ether showed the W/O microemulsions to be obtained first after destabilization of a liquid crystalline phase by addition of the hexadecane. The original lamellar liquid crystalline phase was moved towards higher surfactant/cosurfactant ratios and a new phase with inverse amphiphile cylinders in a hexagonal packing appeared. © 1983 Steinkopff

Preparation Of Cationic Polymer Surfaces By Grafting Polymerization

A cationic polymer surface with extensive capacity for adsorption of anionic surfactants was prepared by graft polymerization of vinyl pyridine onto a plasma‐treated polypropylene surface. The nitrogen was quaternized in order to obtain the cationic sites. The concentration dependence of adsorption from high eletrolyte solution of the anionic surfactant was similar to the one a solid surface from solutions with no added electrolyte. The hydrophobic contribution to the adsorption was experienced at surfactant concentrations far below its critical micellization. Copyright © 1982 John Wiley & Sons, Inc

Making Space for Failure in the Scholarship of Teaching and Learning: A Blueprint

In this essay, we offer a typology of failure in the scholarship of teaching and learning (SoTL) to serve as the foundation for a new line of inquiry to be featured in this new section of Teaching & Learning Inquiry — SoTL in Process. Through the typology, we advocate for making space to talk about failure and its many forms in SoTL. Read the corresponding ISSOTL blog post here

Does this comatose survivor of cardiac arrest have a poor prognosis?

Neurological prognostication in comatose survivors of cardiac arrest requires a multimodal approach combining clinical and diagnostic tests. Most patients with good outcomes recover consciousness within 72–120 h of arrest, and therefore the suggested timing for prognostication is 72 h from ROSC, or later. Results of earlier prognostic tests, such as status myoclonus and NSE levels, should also be considered at this time point. A careful clinical neurological examination is the cornerstone of prognostic assessment [and it should be performed after major confounders, (e.g. residual sedation,neuromuscular blockade, metabolic derangements) have been excluded.Although absent or extensormotor responses to pain are not specific for predicting a poor neurological outcome, they are highly sensitive for identifying those patients who require neurological prognostication

Quantum limits to center-of-mass measurements

We discuss the issue of measuring the mean position (center-of-mass) of a group of bosonic or fermionic quantum particles, including particle number fluctuations. We introduce a standard quantum limit for these measurements at ultra-low temperatures, and discuss this limit in the context of both photons and ultra-cold atoms. In the case of fermions, we present evidence that the Pauli exclusion principle has a strongly beneficial effect, giving rise to a 1/N scaling in the position standard-deviation -- as opposed to a $1/\sqrt{N}$ scaling for bosons. The difference between the actual mean-position fluctuation and this limit is evidence for quantum wave-packet spreading in the center-of-mass. This macroscopic quantum effect cannot be readily observed for non-interacting particles, due to classical pulse broadening. For this reason, we also study the evolution of photonic and matter-wave solitons, where classical dispersion is suppressed. In the photonic case, we show that the intrinsic quantum diffusion of the mean position can contribute significantly to uncertainties in soliton pulse arrival times. We also discuss ways in which the relatively long lifetimes of attractive bosons in matter-wave solitons may be used to demonstrate quantum interference between massive objects composed of thousands of particles.Comment: 12 pages, 6 figures. Submitted to PRA. Revised to include more references as well as a discussion of fermionic center-of-mas

Assessment of female sex as a risk factor in atrial fibrillation in Sweden: nationwide retrospective cohort study

Objective To determine whether women with atrial fibrillation have a higher risk of stroke than men