We have performed soft X-ray spectroscopy of two hot white dwarfs with the Chandra observatory using the Low Energy Transmission Grating. The first target is the hot DA white dwarf LB1919 (T eff =69 000 K). This star is representative of a small group of hot DAs whose metallicities lie well below predictions from radiative levitation theory. The Chandra spectrum shows a rich absorption line spe...

Cell-cell fusion proteins are essential in development. Here we show that the C. elegans cell-cell fusion protein EFF-1 is structurally homologous to viral class II fusion proteins. The 2.6 Å crystal structure of the EFF-1 trimer displays the same 3D fold and quaternary conformation of postfusion class II viral fusion proteins, although it lacks a nonpolar "fusion loop," indicating that it does...

611 Electrons propagating through the bidimensional structure of graphene have a linear relation between energy and momentum, and thus behave as massless Dirac fermions1–3. Consequently, graphene exhibits electronic properties for a two-dimensional (2D) gas of charged particles described by the relativistic Dirac equation, rather than the non-relativistic Schrödinger equation with an eff ective...

The neutrino energy density of the Universe can be conveniently parametrized in terms of the so-called effective number of neutrinos, N eff ν . This parameter enters in several cosmological observables. In particular it is an important input in those numerical codes, like CMBFAST, which are used to study the Cosmic Microwave Background anisotropy spectrum. By studying the neutrino decoupling wi...

Œe widespread global deployment of smart meters o‚ers a unique opportunity for utilities to understand the energy use lifestyles and needs of their consumers. It also presents a new challenge: mining these massive datasets and translating €ne-grained consumption data into meaningful insights for purposes of eciency and interpretability. In this paper, we focus on the segmentation of consumer l...

Sexually transmitted infections other than HIV are important global health issues. They have, however, been neglected as a public-health priority and control eff orts continue to fail. Sexually transmitted infections, by their nature, aff ect individuals, who are part of partnerships and larger sexual networks, and in turn populations. We propose a framework of individual, partnership, and popu...

Evolution of a large part low-mass X-ray binaries (LMXBs) leads to the formation rapidly rotating pulsars with helium white dwarf (He WD) companion. Observations indicate that some He WDs in binary pulsar systems are ultracool (with effective temperatures $T_{\rm eff}\lesssim$ 4000\, K). It is hard cool down WD such low within Hubble time, because thick hydrogen envelope was left behind around ...

By means of density functional theory plus dynamical mean-field (DFT+DMFT) calculations and resonant inelastic x-ray scattering (RIXS) experiments, we investigate the high-pressure phases spin-orbit-coupled $J_{\rm{eff}}=3/2$ insulator GaTa$_4$Se$_8$. Its metallic phase, derived from Mott state by applying pressure, is found to carry moments. The characteristic excitation peak in RIXS spectrum ...

BACKGROUND Regulatory and biophysical mechanisms of cell-cell fusion are largely unknown despite the fundamental requirement for fused cells in eukaryotic development. Only two cellular fusogens that are not of clear recent viral origin have been identified to date, both in nematodes. One of these, EFF-1, is necessary for most cell fusions in Caenorhabditis elegans. Unregulated EFF-1 expression...

eFF overcomes the difficulties of modeling potentially non-adiabatic systems by evaluating the energy of the system as a function of the nuclear coordinates and electron coordinates with a small set of universal electron parameters. This ensures that energy may be partitioned separately into nuclear and electronic degrees of freedom, thus electrons may hop between states without concomitant nuc...