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  • Humans
  • Life and Medical Sciences
  • 2005-2009
  • 2000-2004
  • 1995-1999  (2)
  • 1965-1969
  • 1996  (2)
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  • 2005-2009
  • 2000-2004
  • 1995-1999  (2)
  • 1965-1969
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  • 1
    ISSN: 0197-8462
    Schlagwort(e): exposure chamber ; psychophysics ; detection ; environmental guidelines ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Physik
    Notizen: The objective of this study was to assess the ability of humans to detect the presence of DC electric fields and ion currents. An exposure chamber simulating conditions present in the vicinity of high-voltage DC (HVDC) lines was designed and built for this purpose. In these experiments, the facility was used to expose observers to DC electric fields up to 50 kV/m and ion current densities up to 120 nA/m2. Forty-eight volunteers (25 women and 23 men) between the ages of 18 and 57 years served as observers. Perception of DC fields was examined by using two psychophysical methods: an adaptive staircase procedure and a rating method derived from signal-detection theory. Subjects completed three different series of observations by using each of these methods: one was conducted without ion currents, and the other two involved various combinations of electric fields and ion currents. Overall, subjects were significantly more likely to detect DC fields as the intensity increased. Observers were able to detect the presence of DC fields alone, but only at high intensities; the average threshold was 45 kV/m. Except in the most sensitive individuals, ion current densities up to 60 nA/m2 did not significantly facilitate the detection of DC fields. However, higher ion current densities were associated with a substantial lowering of sensory thresholds in a large majority of observers. Data analysis also revealed large variations in perceptual thresholds among observers. Normative data indicating DC field and ion current intensities that can be detected by 50% of all observers are provided. In addition, for the most sensitive observers, several other detection proportions were derived from the distribution of individual detection capabilities. These data can form the basis for environmental guidelines relating to the design of HVDC lines. © 1996 Wiley-Liss, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 1996-11-22
    Beschreibung: Despite its high prevalence, very little is known regarding genetic predisposition to prostate cancer. A genome-wide scan performed in 66 high-risk prostate cancer families has provided evidence of linkage to the long arm of chromosome 1 (1q24-25). Analysis of an additional set of 25 North American and Swedish families with markers in this region resulted in significant evidence of linkage in the combined set of 91 families. The data provide strong evidence of a major prostate cancer susceptibility locus on chromosome 1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, J R -- Freije, D -- Carpten, J D -- Gronberg, H -- Xu, J -- Isaacs, S D -- Brownstein, M J -- Bova, G S -- Guo, H -- Bujnovszky, P -- Nusskern, D R -- Damber, J E -- Bergh, A -- Emanuelsson, M -- Kallioniemi, O P -- Walker-Daniels, J -- Bailey-Wilson, J E -- Beaty, T H -- Meyers, D A -- Walsh, P C -- Collins, F S -- Trent, J M -- Isaacs, W B -- CA58236/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1996 Nov 22;274(5291):1371-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Center for Human Genome Research, National Institutes of Health, Bethesda, MD, USA. jtrent@nchgr.nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8910276" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adult ; Aged ; Aged, 80 and over ; *Chromosome Mapping ; *Chromosomes, Human, Pair 1 ; Dinucleotide Repeats ; *Genes ; Genetic Linkage ; Genetic Markers ; Genetic Predisposition to Disease ; Humans ; Likelihood Functions ; Male ; Middle Aged ; North America ; Oncogenes ; Pedigree ; Prostatic Neoplasms/*genetics ; Risk Factors ; Statistics, Nonparametric ; Sweden
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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