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[en] In the effort to find the reasons lead to unstabilization of low radiation dose effects, the influence of the Persistent, Bioaccumulative and Toxic chemicals such as Arsenic, Cadmium and other heavy ion to chromosome aberrations in Human lymphocytes exposed to gamma rays was investigated. The presentation of the agents that prevented repair of DNA breaks by irradiation can induced more breaks than not. With a suggest that Cadmium is a factor that can cause damages in DNA molecular and inactivated repair enzyme also, the investigating chromosome aberrations induced in human lymphocytes by combined action of Cadmium and gamma rays is conducted with 4 groups: Cd; gamma; Cd/gamma and Gamma/Cd. Different with Arsenic, the observed results presented that Cadmium in the single concentrations 0.05 μg/ml and 0.10 μg/ml were not aspect to mitotic index and chromosome aberrations also. In the combined treatments, the difference on frequencies of Dicentric and Fragment in lymphocytes treated with variable Cadmium concentrations in the same group of gamma rays dose was clearly. Following the increasing of Cd concentrations in the combinations exposed to the same radiation dose, the frequencies of Dicentrics were decreasing but the frequencies of Fragments were increasing. The difference on frequencies of chromosome aberrations was not detected in the Cadmium concentrations 0.05 μg/ml and 0.10 μg/ml of the combinations of post-exposed to gamma rays, it means that Cadmium do not aspect to the induction of chromosome aberrations after repair time. We suggest that Cadmium is not directly causing chromosome aberrations but aspect to the DNA damage repair progress of lymphocytes. The Cadmium can induced the increasing fragments (blocking of cohensive free ends) by bound the blunt free-end of DSB or create near site DSB (unblunt free-end) that lead to difficulty in joint together.(author)
[en] The 21. annual World Energy Markets Observatory (WEMO) reveals a world struggling to balance the desire for continued economic growth with the need to take deliberate and drastic steps against climate change. In 2018, global energy consumption rose 2.3 percent - nearly twice the average rate since 2010 - as driven by a robust worldwide economy. Despite the rapid growth of renewables in some regions, oil, gas and coal accounted for nearly three-quarters of the increase in total energy demand, their highest share in five years. As a result, greenhouse gas emissions climbed 2 percent globally, a significant break from the plateau of 2014 to 2016. While renewables remain the fastest-growing energy source worldwide, investments during the first half of 2019 declined 14 percent compared with the same period in 2018. Population growth, as well as a lack of anticipated technical breakthroughs over the next two decades, further contribute to a bleak medium- and long-term landscape. This year's WEMO report explores these issues in greater detail and presents new ideas for how utilities, policy-makers and private companies can embrace a long-term strategy that balances growth and change - and draws opportunity from crisis.