ABSTRACT
This paper describes lake sediment spheroidal carbonaceous particle (SCP) profiles from Laguna Chica San Pedro, located in the Biobío Region, Chile (36 degrees 51' S, 73 degrees 05' W). The earliest presence of SCPs was found at 16 cm depth, corresponding to the 1915-1937 period, at the very onset of industrial activities in the study area. No SCPs were found at lower depths. SCP concentrations in Laguna Chica San Pedro lake sediments were directly related to local industrial activities. Moreover, no SCPs were found in Galletué lake (38 degrees 41' S, 71 degrees 17.5' W), a pristine high mountain water body used here as a reference site, suggesting that contribution from long distance atmospheric transport could be neglected, unlike published data from remote Northern Hemisphere lakes. These results are the first SCP sediment profiles from Chile, showing a direct relationship with fossil fuel consumption in the region. Cores were dated using the 210Pb technique.
Subject(s)
Environmental Pollutants/analysis , Fossil Fuels/analysis , Geologic Sediments/analysis , Air Pollutants/analysis , Calcium Carbonate/analysis , Chile , Environmental Monitoring/methods , Environmental Pollution , Fresh Water , Lead Radioisotopes/analysis , Microscopy, Electron, Scanning , Particle Size , Time FactorsABSTRACT
A 48 year-old male presented with a 6 month history of a dementia syndrome, memory deficit, impairment of judgement, and right sligth hemiplegia, and sexual promiscuity, ELISA for HIV was negative; the VDRL and FTA-abs for syphilis were positive (1/8 and 3 mas respectively); VDRL int the CSF was positive (1/8) making the diagnosis of neurological syphilis. In addition, significant NMR images are presented. The patient received penicilin I.V. with clinical, neurological and radiological improvement.
