Intracellular calcium handling plays an important role in cardiac electrophysiology. Using two fluorescent indicators, we developed an optical mapping system that is capable of measuring calcium transients and action potentials at 256 recording sites simultaneously from the intact guinea pig heart. On the basis of in vitro measurements of dye excitation and emission spectra, excitation and emis...

We improve the identification and isolation of individual stellar populations in Galactic halo based on an updated set empirically calibrated isochrones Sloan Digital Sky Survey Pan-STARRS 1 photometric systems. Along prime meridian (l = 0° 180°), where proper motions parallaxes from Gaia DR2 can be used to compute rotational velocities stars rest frame Milky Way, we use observed double color–m...

We report the discovery of emerged tidal tails around open cluster IC 4756 ($\sim$ 1 Gyr) based on 644 members identified from {\it Gaia} EDR3. Three-dimensional spatial positions, two-dimensional tangential velocities $\left( x, y, z, \kappa \cdot \mu_{\alpha}^{*}/\varpi, \mu_{\delta}/\varpi \right)$ are utilized to determine co-moving member candidates 4756. Using a Bayesian method, we correc...

Polar performance diagrams are commonly used to predict the of a sailing vessel under given wind conditions. They are, in particular, an essential part robotic vessels and basis for weather routing algorithms. In this paper we introduce new framework scientific work with such diagrams, which make available as open source Python package. It contains model creation polar from measurement data sup...

We present Hand K-band spectroscopy of OB and Wolf-Rayet (WR) members of the Milky Way cluster 1806–20 (G10.0–0.3), to obtain a revised cluster distance of relevance to the 2004 giant flare from the SGR 1806–20 magnetar. From GNIRS spectroscopy obtained with Gemini South, four candidate OB stars are confirmed as late O/early B supergiants, while we support previous mid WN and late WC classifica...

We determine the relative ages of the open cluster NGC 188 and selected Hipparcos field stars by isochrone fitting, and compare them to the age of the thick disk globular cluster 47 Tuc. The best fit age for NGC 188 was determined to be 6.5 ±1.0 Gyr. The solar metallicity Hipparcos field stars yielded a slightly older thin disk age, 7.5 ±0.7 Gyr. Two slightly metal-poor ([Fe/H] = −0.22) field s...

Observations show that nearly all star clusters and stellar populations contain blue straggler stars (BSs). BSs in a cluster can significantly enhance the integrated spectrum of the host population, preferentially at short wavelengths, and render it much bluer in photometric colours. Current theoretical simple stellar population (SSP) models constructed within the traditional framework of singl...

Differential EV −I variations of up to ∼ 0.2 mag on a scale of arcminutes across NGC 3201 are presented in the form of an extinction map. This map, created by calculating average EV −I values for stars in small subregions of the field with respect to a fiducial region, greatly improves the appearance of the CMD of the cluster. We describe how we implemented this technique in detail with our dat...

We model three dSph galaxies, Draco, Ursa Minor and Fornax, as axisymmetric stellar systems embedded in spherical dark-matter potentials, which are in dynamical equilibrium without significant external tidal forces. We construct non-parametric twoand three-integral models that match the observed surfacedensity profiles and the current kinematic samples of∼ 150−200 stars per galaxy; these models...