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The 1980 National Natality Survey (NNS) and 1980 National Fetal Mortality Survey (NFMS) provide a unique opportunity to examine variation in exposure to radiation during pregnancy for mothers of live-born and stillborn infants. Maternal race, age, education, and marital status in both surveys and low birth weight in the 1980 NNS are characteristics used to(More)
Excessive production of active oxygen radicals by macrophages is proposed to play an important role in asbestos-related diseases. The purpose of this study was to examine the capacity and mechanisms of action of various forms of asbestos to stimulate superoxide anion production by guinea pig alveolar macrophages. Chrysotile, but not the amphiboles(More)
A 27-year-old man with a history of intravenous-narcotic abuse presented with signs and symptoms suggesting fungal endophthalmitis. He underwent core vitrectomy with intravitreal injection of amphotericin B. Aspergillus flavus grew from cultures of the vitreous aspirate. There was no evidence of extraocular infection, and the patient was treated(More)
Three organophosphate compounds, dichlorvos, parathion and diisopropylfluorophosphate were tested as an unconditioned stimulus in the conditioned taste aversion (CTA) test. All organophosphates caused a dose-dependent CTA in rats at doses which did not induce any other signs of toxicity. Experiments with dichlorvos showed that the minimum dose which caused(More)
Simulations have been made of atmospheric-transmittance spectra over a 5.1-km sea-level path measured by the Naval Research Laboratory, Washington, D.C. New CO(2) line-profile form factors were used that had been obtained previously from experiment. The simulations were found to agree well with the field spectra, supporting the validity of the CO(2) line(More)
The frequencies of CO(2) lines in the 3.77-4.26-microm region, which were obtained experimentally, have been compared with those listed on two tapes of the AFCRL Atmospheric Absorption Line Parameters Compilation. The experimental line frequencies were obtained in absorption using a high-resolution Michelson interferometer. Discrepancies between the present(More)
We describe a fast reciprocating Langmuir probe and drive system, which has four main new features: (1) use of high-temperature, vacuum, circuit boards instead of cables to reduce weight and increase to 21 the number of possible connections, (2) rotatable and removable shaft, (3) 10 tip construction with designed hardware bandwidth up to 10 MHz, and (4) a(More)