-recognition process of hydrogen-bonded and geometrical features extracted from x-ray coordinates. Cooperative secondary structure is recognized as repeats of the elementary hydrogen-bonding patterns “turn ” and “bridge. ” Repeating turns are “helices, ” repeating bridges are “ladders, ” connected ladders are “sheets

Three-dimensional model and quaternary structure of the human eye lens protein yS-crystallin based on 0- and y-crystallin X-ray coordinates and ultracentrifugation

The potassium channel from Streptomyces lividans is an integral membrane protein with sequence similarity to all known K1 channels, particularly in the pore region. X-ray analysis with data to 3.2 angstroms reveals that four identical subunits create an inverted teepee, or cone, cradling

A*. Methods. The observations have been carried out using the NACO adaptive optics (AO) instrument at the2 Eckart, Baganoff, Morris, Schödel et al.: Simultaneous NIR/X-ray Flare from Sgr A* European Southern Observatory’s Very Large Telescope ⋆ and the ACIS-I instrument aboard the Chandra X-ray Observatory

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Operation of an X-ray spectrometer based on a spherical variable-line-spacing (VLS) grating is analyzed using dedicated ray-tracing software allowing fast optimization of the grating parameters and spectrometer geometry. The analysis is illustrated with optical design of a model spectrometer

X-ray tomographic image reconstruction consists in determining an object function from its projections. In many ap- plications such as non destructive testing, we look for a default region (air) in a homogeneous known background (metal). The image reconstruction problem becomes

The information content of the autocorrelation function (ACF) of intensity fluctuations of the X–ray background (XRB) is analyzed. The tight upper limits set by ROSAT deep survey data on the ACF at arcmin scales imply strong constraints on clustering properties of X–ray sources at cosmological

Results are reported from the first survey of X-ray emission from galaxies in pairs. The sample consists of fifty-two pairs of galaxies from the Catalog of Paired Galaxies (CPG) Karachentsev (1972) whose coordinates overlap ROSAT Position Sensitive Proportional Counter (PSPC) pointed observations

,5,9,13-monobenzotetraazacyclo[15]tetradecine, was identified by X-ray diffraction analysis.