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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of epidemiology 14 (1998), S. 491-494 
    ISSN: 1573-7284
    Keywords: Altitude ; Gastric cancer ; Geographic location ; Healthy subjects ; Helicobacter pylori infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It is a cross-sectional study, comparing the prevalence of Helicobacter pylori infection (prevalence of IgG antibodies to H. pylori) in the healthy population of Ubrique and Grazalema (mountain location, mortality from stomach cancer 20/100,000) and in Barbate, (coastal location, mortality from stomach cancer 10/100,000) in the province of Cádiz, southern Spain. The subjects were randomly selected, 163 men and 169 women, 18 years or older; 179 persons were studied in the inland, and 154 in the littoral in January 1997. Of the 332 subjects investigated, 43% were positive, a mean antibody titer of 337 IU/l (95% CI: 254–420), and 56% were negative, with a mean titer of 18 IU/l (95% CI: 15–19). In the coastal population, 30% has positive titers and 54% in the mountain location. By age: 18–40 years, 30% of littoral and 41% of inland population had positive titers; 41–60 years, 35% of those living in the littoral and 58% of inland population had positive titers; 〉 60 years, 24% of coastal inhabitants and 62% of those living in the inland had positive titers. Living in mountain locations in the province of Cádiz involves a greater ecological risk for H. pylori infection (p 〈 0.05).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1536
    Keywords: Micelles ; micelle size ; fluorescence ; polar additives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The steady-state fluorescence quenching technique was used to investigate the effect of the presence of a series of alcohol homologues of mid-sized straight chain on the size of mixed micelles of sodium dodecyl sulfate (SDS). We used pyrene at concentration of ca. 10−6M, where only its monomer exhibits any fluorescence, as fluorescent probe, and cetylpiridinium chloride at concentrations in the range (1–9)×10−5 M as quencher. This technique allows one to determine the micellar aggregation number. The number of alcohol molecules per micelle was calculated from reported values for the micelle-water partition coefficient. On the assumption of spherical micelles, their hydrophobic radii was then calculated. The hypothesis that micelle size is determined by the available surface area per charged headgroup is discussed in the light of the results obtained.
    Type of Medium: Electronic Resource
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