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Highly sensitive imaging observations of the Galactic center () at high energies with an angular resolution of order 10 arcminutes, is a very recent development in the field of high-energy astrophysics. The Ibis/Isgri imager on the Integral observatory detected for the first time a hard X-ray source, IGR J17456–2901, located within 1 arcminute of(More)
This Letter presents the first results of an observational campaign to study the Galactic center with INTEGRAL, the Internaltional Gamma-Ray Astrophysics Laboratory. Mosaicked images were constructed using data obtained with ISGRI, the soft gamma-ray instrument of the coded aperture IBIS imager, in the energy ranges 20–40 and 40–100 keV. These give a yet(More)
BACKGROUND An increasingly common application is the use of silver nanoparticles for antimicrobial coatings, wound dressings, and biomedical devices. In this present investigation, we report, biomedical potential of silver nanopaticles synthesized from calli extract of Citrullus colocynthis on Human epidermoid larynx carcinoma (HEp -2) cell line. METHODS(More)
We present the highly significant detection of a quasi-periodic flux modulation with a period of 22.2 min seen in the X-ray data of the Sgr A * flare of 2004 August 31. This flaring event, which lasted a total of about three hours, was detected simultaneously by EPIC on XMM-Newton and the NICMOS near-infrared camera on the HST. Given the inherent difficulty(More)