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  • 1
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The experimental images of the sidescattered light from a plasma, created by the multiterawatt laser pulse propagating in a hydrogen gas jet, exhibit clear dependence on both gas jet pressure and laser power. Two- and three-dimensional simulations of wave propagation, in presence of the relativistic electron mass increase and the ponderomotive expel of electrons, have been performed to reproduce the Thomson radiation from the plasma electrons. They show electron cavitation induced by the beam focusing, self-focusing, self-guiding, smoothing of the beam nonuniformities and, at larger power, beam filamentation. A bremsstrahlung model with account of the ionization, heating, expansion, and recombination dynamics of the gas, provides the plasma emission background. Both Thomson emission and bremsstrahlung are required to recover the experimental emission patterns. Among the interpretations, a scenario of laser self-guiding over five Rayleigh lengths can be found for 10 TW laser power and 5×1018 cm−3 electron density, which surprisingly disappears at larger powers and densities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two diagnostics for the study of hard x-ray emission produced by plasmas during inertial confinement fusion experiments, are described: (i) a hard x-ray spectrometer to measure the high-energy tail of the spectrum, with eight spectral bands in the 50–400-keV range, by fluorescence and simple filter techniques; (ii) a time-integrated pinhole imaging device using a microchannel plate converter tube and a 7.5-μm-thick tantalum photocathode adjusted for a mean spectral sensitivity around 200 keV. Adjustment and test of these diagnostics have been performed with a pulsed hard x-ray generator using a plasma focus device. Absolute calibration of the spectrometer detectors (scintillator Photomultiplier) was obtained on an x-ray tube with fluorescent emission lines (10–100 keV) and with a cobalt radioactive source at 1.23 MeV.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5604-5609 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Calibrated thermoluminescence dosimeters have been used to measure the angular and spectral dependence of hard x-ray emission produced from intense subpicosecond laser irradiation of solid targets. A dosimeter detector set with nine filter channels (13.5–400 keV) has been tested successfully. Total bremsstrahlung conversion up to 0.23% and conversion of 8×10−5 from laser energy to Ta Kα line emission (photon energy ≈57 keV) was determined. The scaling of the hard x-ray yield with laser intensities ranging from 3×1016 to 3×1018 W/cm2 was investigated. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 41 (1999), S. 0 
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 35 (1996), S. 0 
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 55 (1990), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of brine concentration (5.7.10.15 and 20% NaCl) on pre-treatment of capers to improve preservation and packing conditions (3–10% salt, 0–1.5% acetic acid and pasteurization) on product stability were studied. All brines containing 10% salt and higher proved equally adequate for the preservation of capers at least for 27 months. The finished products manufactured from stock held in such brines had typical texture flavor and color. The use of lower concentration brines led to off-flavor development and softening of the product. Pasteurization (80°C, 15 min) of the finished product proved efficient for preventing spoilage. Non-pasteurized samples required high salt (ca 6%) and acid (ca 1%) levels for preservation. Otherwise, a yellow sediment developed as a consequence of microbial growth.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1238
    Keywords: Multiple trauma ; Intensive care ; Mortality ; Trauma severity indices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective Analysis of epidemiologic aspects in a trauma intensive care unit (TICU) and assessment of predicted outcomes. Design Prospective study. Samples collected over a 2-year period. Setting A Spanish TICU at a tertiary care centre. Patients A group of 404 trauma patients. Interventions TRISS methodology was applied. Main results Mean age was 35.8±17 years. Mortality was 19.6% over a median ISS=17. Blunt trauma was more frequent than penetrating trauma (90.1% versus 9.9%). Car accident was the major aetiological factor (32.4%) and the highest mortality was among struck pedestrians (26.4%). The cranial region showed the highest incidence of lesion (57.9%) and the neurological complications on stage were the commonest reported on the discharge forms (49.7%). Mechanical ventilatory support (MVS) was applied in 53.2% of patients, with a relative mortality of 35.8%. Survivors differed significantly from nonsurvivors in terms of age, Glasgow Coma Scale rating, RTS, ISS, TRISS, stage and number of complications reported. The risk factors found to be associated with mortality were injury to cranial and abdominal/pelvic regions and age over 65. The TRISS total accuracy was 0.88 (sensitivity=0.67; specificity=0.93; area under the ROC curve=0.85±0.03). Forward stepwise logistic regression analysis selected age, ISS and RTS as the best predictors of survival. When our TRISS results were compared with those anticipated on the basis the MTOS, an injury severity mismatch appeared (z=0.02; M=0.78). Conclusions We found a 19.6% mortality in the TICU. Cranial and abdominal/pelvic injury and age over 65 were the main risk factors on admittance. Clinically, we finally agreed with the majority of TRISS outcome predictions. However, we could not statistically validate the apparent clinical goodness of the TRISS methodology.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 115 (1993), S. 161-171 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The naturally occurring radionuclide 210Po is useful as a tracer of diets of marine organisms. Data for 210Pb, the grandparent of 210Po, are less abundant: we therefore report here 210Pb concentrations in a substantial collection of marine biota obtained from the Antarctic Ocean during the SIBEX II cruise in 1985. The general levels of 210Pb are within the range of previously published data but, as in the case of 210Po, there are differences which can be associated with variations in the diet of the organism. The levels of 210Pb in the krill Euphausia superba show seasonal changes which can be interpreted in terms of changing diet. In a simple classification of the pelagic food chain, the levels of 210Pb tend to increase from omnivores to filter-feeders to predators.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1574-4647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have investigated the effects on blood and liver lipoperoxide levels of turmeric, a potent antioxidant (from the rhizome of Curcuma Longa) which is extensively used as a food additive in India and other Asiatic and Central American countries. This study was performed on female Swiss mice that were 17±2 week old at the start of the experiment. A control group of 20 mice was fed the standard diet and another 20 animals received in their food 4 mg/Kg mouse/day of hydroalcoholic extract of turmeric, equivalent to 0.4 mg/Kg mouse/day of the phenolic antioxidant curcumin. This concentration is similar to that used in our current testing of turmeric on human subjects. The effects of the treatment were determined weekly by measuring food intake, body weight and muscular and CNS function (evaluating performance of mice subjected to string and T-maze tests). After four weeks of treatment, the mice were sacrificed and blood and liver samples were removed for determination of lipid peroxidation (measuring malondialdehyde content by the thiobarbituric acid method). The treatment with turmeric did not result in any toxic effects on the above physiological, behavioral and biochemical parameters. On the other hand, our data show a decrease in the level of both plasma and liver lipid peroxides. In our opinion, these preliminary data justify further animal investigations on the effects of treatment with this antioxidant not only on lipid peroxidation, but also on atherogenesis and senescence, since, according to the radical theory of aging, they man be linked to peroxidative changes.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1574-4647
    Keywords: Atherosclerosis ; atherogenesis ; lipoperoxides ; LDL ; turmeric ; curcuma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Extracts from the rhyzome of Curcuma longa are widely used as food additives in India and other Asiatic and Central American countries. It has been shown that these extracts (“turmeric”), as well as “curcumin” and related phenolic compounds isolated from Curcuma, have a powerful antioxidant action when tested in in vitro systems. Moreover, previous research from our laboratories has shown significant decreases in the levels of lipid peroxides in the blood of both mice and human subjects administered “turmeric.” Our present research complements the previous data, showing that a daily intake of turmeric equivalent to 20 mg of the phenolic antioxidant curcumin for 60 days decreases the high levels of peroxidation of both the HDL and the LDL, in vivo, in 30 healthy volunteers ranging in age from 40 to 90 years. The effect was quite striking in the persons with high baseline values of peroxidized compounds in these lipoproteins, while no apparent change took place in the persons having low baseline values. In view of current concepts on the atherogenic role played by peroxidized HDL, and especially by peroxidized LDL, as inducers of foam and smooth cell proliferation in the arterial wall, this preliminary experiment suggests that the Curcuma phenolic antioxidants, because of their high antioxidant activity and lack of toxicity, might be a useful complement to standard hypo-lipidemic drugs in the prevention and treatment of atherosclerosis.
    Type of Medium: Electronic Resource
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