Slow ion irradiation of sugar: astrobiological implications

An IR study of pure and ion irradiated frozen formamide

The chemical evolution of formamide (HCONH2), a molecule of astrobiological interest that has been tentatively identified in interstellar ices and in cometary coma, has been studied in laboratory under simulated astrophysical conditions such as ion irradiation at low temperature.

Electron spin resonance study of DNA irradiated with an argon-ion beam: evidence for formation of sugar phosphate backbone radicals.

In this study, the effects of high-LET radiation on DNA were investigated and compared with the effects of gamma radiation. Hydrated DNA samples at 77 K were irradiated with argon-ion beams ((36)Ar or (40)Ar beam at energies between 60 and 100 MeV/nucleon). The individual free radicals formed were identified and their yields were investigated by electron spin resonance spectroscopy. Argon-ion i...

Physical Controls on Antarctic Dry Valleys Permafrost Geomorphol- Ogy and Soil Ecosystem Habitability: Cold-desert Processes and Mars Astrobiological Implications

Slow Heating Methods in Tandem Mass Spectrometry

Several approaches to ion activation in tandem mass spectrometry have been developed in recent years for use in ion trapping instruments that allow for conditions to be reached wherein rates of ion activation and deactivation are comparable. These approaches are deÐned as slow heating methods and include continuous-wave laser infrared multiphoton dissociation, dissociation driven by blackbody r...

Induction of cancer stem-like cells in A549 cells after exposure to carbon ions and X-rays

Background: Cancer stem-like cells (CSCs) play a crucial role in the initiation, progression, and recurrence of cancer. Evidence indicates that the high linear energy transfer (LET) carbon ion beam is more effective against CSCs than the conventional X-ray beam. Carbon ion radiotherapy is considered as a promising cancer strategy, however, information about whether, or not, new CSCs are induced...