The peopling of the last Green Sahara revealed by high-coverage resequencing of trans-Saharan patrilineages

Little is known about the peopling of the Sahara during the Holocene climatic optimum, when the desert was replaced by a fertile environment

Atti del IV Congresso Nazionale di Medicina Preventiva dei Lavoratori della Sanit\ue0\ua0 "Tutela e promozione della salute e della sicurezza nella progettazione e ristrutturazione dei presidi ospedalieri"

Giornale Italiano di Medicina del Lavoro e Ergonomi

Raman-generated pump impact on Optical Parametric Amplification

Continuous-wave (CW) Raman-generated pump impact on a fiber optical parametric amplifier (OPA) is analyzed. Different noise contributions associated to the pump are experimentally and theoretically evaluated. Gain and noise figure of the amplifier are presented and commented for different OPA configurations. By tightly filtering the CW Raman-generated pump an OPA noise figure approaching the 3 dB limit is achieved

COLOR-VISION LOSS IN WORKERS EXPOSED TO ELEMENTAL MERCURY-VAPOR

We evaluated colour vision in 33 workers exposed to elemental mercury (Hg) vapour and in 33 referents matched for sex, age, alcohol consumption and cigarette smoking. The results were expressed as colour confusion index (CCI). In the workers urinary excretion of Hg (HgU) ranged from 28 to 287 mu g/g creatinine. Subclinical colour vision loss, mainly in the blue-yellow range, was observed in the workers. This effect was related to exposure, as indicated by the correlation between HgU and CCI (r = 0.488, P < 0.01). In the workers whose HgU exceeded 50 mu g/g creatinine, mean CCI was significantly increased compared to the matched referents. The results suggest that exposure to elemental Hg inducing HgU values exceeding 50 mu g/g creatinine can induce a dose-related colour vision loss