Mkn 421 was observed for about two days with BeppoSAX, prior to and partly overlapping the start of a 1 week continuous exposure with ASCA in April 1998, as part of a worldwide multiwavelength campaign. A pronounced, well defined, flare observed in X-rays was also observed simultaneously at TeV energies by the Whipple Observatory's 10 m gamma-ray telescope. These data provide the first evidence...

“Cometary” Blue Compact Dwarf Galaxies (iI,C BCDs) are characterized by an off–center starburst close to the end of their elongated stellar bodies. This rare phenomenon may carry some clues on how collective star formation ignites and propagates in gas–rich low–mass stellar systems. This off– center burst may be a fortuitous enhancement of the otherwise moderate star–forming activity of a dwarf...

It was recently suggested that possible small violations of Lorentz invariance could explain the existence of UHECR beyond the GZK cutoff and the observations of multi-TeV gamma-rays from Mkn 501. Our analysis of Lorentz-violating kinematics shows that in addition to the modified threshold conditions solving cosmic ray puzzles we should expect a strong suppression of electromagnetic processes l...

We fit the SEDs of the TeV blazar Mkn 501 adopting the homogeneous SynchrotronSelf Compton model to simultaneous X-ray and TeV spectra recently become available. We present detailed model spectra calculated with the above constraints and taking into account the absorption of TeV photons by the IR background. We found that the curved TeV spectra can be naturally reproduced even without IRB absor...

The blazar type active galaxy Mkn 421 was observed during an active phase in January and February 2001 with the X-ray satellite RXTE and with the ground-based HEGRA system of TeV Cherenkov telescopes. Observations were coordinated to allow for simultaneous data taking. Both instruments observed time-dependent variations of the flux and the spectral shape in X-rays and TeV γ-rays. Variability an...

It was recently suggested that possible small volations of Lorentz invariance could explain the existence of UHECR beyond the GZK cutoff and the observations of multi-TeV gamma-rays from Mkn 501. Our analysis of Lorentz-violating kinematics shows that in addition to the modified threshold conditions solving cosmic ray puzzles we should expect a strong suppression of electromagnetic processes li...

aim : the aim of this study is to design multi-walled carbon nanotubes (mwcnts) loaded with paclitaxel (ptx) anti-cancer drug and investigate its anti-cancerous efficacy of human gastric cancer. the sidewall surfaces of pristine mwcnts are highly hydrophobic. a major goal in carbon nanotube chemistry has been functionalization for aqueous solubility, and exploiting nano-tubes as macromolecules ...

The status of the HEGRA imaging air Cherenkov telescopes is summarized. We present results from a survey of the Galactic plane for point sources with a limiting flux of approximately a third of the flux seen from the Crab Nebula. For Mkn 421 (z = 0.031) we present the detection of spectral variability correlated with the flux. Finally, we summarize results of observations carried out on the mos...