The limited angular resolution of γ–ray telescopes prevents the straight identification of the majority of the sources detected so far. This is particularly true for the low latitude, probably galactic ones, only 10 % of which has been identified. Most of the counterparts are Isolated Neutron Stars, both radio–loud and radio–quiet, characterised by an extremely high value of fX /fopt. The best ...

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the Nuclear Regulatory Com mission (NRC) by the Society ofNuclear Medicine and the American College ofNuclear Physiciansover four years ago is finally getting some response. The reaction from the peti tion's original author, however, has been less than favorable. Carol S. Marcus, PhD, MD, Director of Nuclear Medicine and Outpatient Clinic atHarbor-UCLAMedicalCenter and the principalauthorof the...

Page 3. It is not entirely clear what causal model the authors have in mind, and specifically whether they consider smoking and air pollution as mediators or confounders of the association between SES and respiratory health. In paragraph two, page 1, they imply mediation (â##â#¦strongly influenced by SES..â##) but in paragraph three, confounding is implied (â##....competing factorsâ#¦â##). This...