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Träfflista för sökning "WFRF:(Scott R) srt2:(1995-1999)"

Sökning: WFRF:(Scott R) > (1995-1999)

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  • Dunham, I, et al. (författare)
  • The DNA sequence of human chromosome 22
  • 1999
  • Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 402:6761, s. 489-495
  • Tidskriftsartikel (refereegranskat)
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  • Clarke, Robert, et al. (författare)
  • Lowering blood homocysteine with folic acid based supplements : Meta-analysis of randomised trials
  • 1998
  • Ingår i: British Medical Journal. - : BMJ. - 0959-8146. ; 316:7135, s. 894-898
  • Forskningsöversikt (refereegranskat)abstract
    • Objective: To determine the size of reduction in homocysteine concentrations produced by dietary supplementation with folic acid and with vitamins B-12 or B-6. Design: Meta-analysis of randomised controlled trials that assessed the effects of folic acid based supplements on blood homocysteine concentration. Multivariate regression analysis was used to determine the effects on homocysteine concentrations of different doses of folic acid and of the addition of vitamin B-12 or B-6. Subjects: Individual data on 1114 people included in 12 trials. Findings: The proportional and absolute reductions in blood homocysteine produced by folic acid supplements were greater at higher pretreatment blood homocysteine concentrations (P < 0.001) and at lower pretreatment blood folate concentrations (P < 0.001). After standardisation to pretreatment blood concentrations of homocysteine of 12 μmol/l and of folate of 12 nmol/l (approximate average concentrations for Western populations), dietary folic acid reduced blood homocysteine concentrations by 25% (95% confidence interval 23% to 28%; P < 0.001), with similar effects in the range of 0.5-5 mg folic acid daily. Vitamin B-12 (mean 0.5 mg daily) produced an additional 7% (3% to 10%) reduction in blood homocysteine. Vitamin B-6 (mean 16.5 mg daily) did not have a significant additional effect. Conclusions: Typically in Western populations, daily supplementation with both 0.5-5 mg folic acid and about 0.5 mg vitamin B-12 would be expected to reduce blood homocysteine concentrations by about a quarter to a third (for example, from about 12 μmol/l to 8-9 μmol/l). Large scale randomised trials of such regimens in high risk populations are now needed to determine whether lowering blood homocysteine concentrations reduces the risk of vascular disease.
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  • Dawson, George J., et al. (författare)
  • Prevalence studies of GB virus-C infection using reverse transcriptase-polymerase chain reaction
  • 1996
  • Ingår i: Journal of Medical Virology. - 1096-9071. ; 50:1, s. 97-103
  • Tidskriftsartikel (refereegranskat)abstract
    • Among the three recently described GB viruses (GBV-A, GBV-B, and GBV-C), only GBV-C has been linked to cryptogenic hepatitis in man. Because of the limited utility of currently available research tests to determine antibody response to GBV-C proteins, the prevalence of GBV-C RNA in human sera was studied using reverse transcription-polymerase chain reaction (RT-PCR). The prevalence of GBV-C is higher among volunteer blood donors with elevated serum alanine aminotransferase (ALT) levels (3.9%) than among volunteer blood donors with normal ALT levels (0.8%). Higher rates were also noted among commercial blood donors (12.9%) and intravenous drug users (16.0%). GBV-C was frequently detected in residents of West Africa, where the prevalence was > 10% in most age groups. Approximately 20% of patients diagnosed with either acute or chronic hepatitis C virus (HCV) were found to be positive for GBV-C RNA. In addition, GBV-C RNA sequences were detected in individuals diagnosed with non-A-E hepatitis, with clinical courses ranging from mild disease to fulminant hepatitis. Fourteen of sixteen subjects with or without clinically apparent hepatitis were positive for GBV-C RNA more than 1 year after the initial positive result.
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  • Hacker, R Scott (författare)
  • The Effect of Residential Crowding on Labor Productivity with Evidence from the Twilight of Polish Socialism
  • 1999
  • Ingår i: Real estate economics (Print). - : Wiley. - 1080-8620 .- 1540-6229. ; 27:1, s. 135-167
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper considers the effect of low per capita housing stock on labor productivity. Theoretically, a negative effect may be expected. Low per capita housing leads to greater difficulty in finding housing, which in turn leads to reduced labor mobility and a less productive allocation of labor. A dynamic model is developed which displays this relationship and which takes into account inter-regional migratory flows induced by regional labor productivity differentials. The empirical part of the paper focuses on cross-sectional information, using primarily 1989 Polish data aggregated at the regional level.
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