By comparing a collisionless cosmological N-body simulation (DM) to a smoothed particle hydrodynamics simulation (SPH) with the same initial conditions, we investigate the correspondence between the dark matter subhalos produced by collisionless dynamics and the galaxies produced by dissipative gas dynamics in a dark matter background. When galaxies in the SPH simulation fall into larger groups...

In order to determine whether sphingomyelin (SPH) affects the rate of cholesterol esterification by plasma lecithin-cholesterol acyltransferase (LCAT), we studied the effects of its incorporation in to defined proteoliposome substrates containing phosphatidyl choline (PC), unesterified cholesterol, and apoprotein A-I, on the activity of purified LCAT. Cholesterol esterification was inhibited by...

We report on the metal ion exchange between Co(2+) and CdS-based molecular clusters. These studies demonstrate that exchange into the smaller [Cd4(SPh)10](2-) clusters is facile compared to the larger [Cd10S4(SPh)16](4-) and [Cd17S4(SPh)28](2-) clusters. This trend correlates with the rate of benzenethiolate interconversion and μ-S(2-) and μ-SPh(-) content among the clusters.

PURPOSE To describe spherical equivalent (sph eq) refractive errors in preschool members of a Native American tribe with a high prevalence of astigmatism. METHODS Cycloplegic autorefraction measurements were obtained for 819 three- and four-year-old Tohono O'odham children, with follow-up measurements in 146 after 4 to 8 years. RESULTS Mean sph eq was significantly more hyperopic in the ast...

The smoothed particle hydrodynamics (SPH) method is a useful numerical tool to study a variety of astrophysical and planetlogical problems. However, it turned out that the standard SPH algorithm has problems in dealing with hydrodynamical instabilities. This problem is due to the assumption that the local density distribution is differentiable. In order to solve this problem, a new SPH formulat...

In 2007, the results from a comparison study of grid based codes and SPH codes on multiphase interactions in compressible fluids were presented [1]. The main conclusion from this study was that whilst the grid codes are able to describe important dynamical instabilities, such as KelvinHelmholtz (KH) and Richtmyer-Meshkov (RM), these processes are poorly described by existing SPH codes. It was l...

سابقه و هدف: گیاه­ پالایی مقرون­ به­ صرفه سازگار با محیط زیست است که در آن گیاه از توانایی‌‌های طبیعی خود برای بازیابی استفاده ‌‌می‌‌‌کند. گیاهان مورد باید توانایی انباشت مقادیر زیادی آلاینده‌‌های فلزی را بدون ایجاد سمیت آنها داشته باشند. امروزه افزایش جمعیت جهان به دنبال توسعه صنایع کارخانه‌‌ها، بر میزان پساب‌‌های وارده غالبا حاوی فلزات سنگین مختلف ‌‌می‌‌‌باشند، افزوده ‌‌می‌‌‌شود. تاثیرات مخرب...