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  • 1
    Electronic Resource
    Electronic Resource
    Increased neurotransmitter biosynthesis in phenylketonuria induced by phenylalanine restriction or by supplementation of unrestricted diet with large amounts of tyrosine (1988)
    Springer
    European journal of pediatrics 148 (1988), S. 238-245 
    Details
    ISSN: 1432-1076
    Keywords: Attention ; Dopamine ; PKU ; Serotonin ; Tyrosine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Seven phenylketonuria (PKU) patients aged 15–24 years were allowed unrestricted diet for 3 weeks. Three of these patients performed well on unrestricted diet according to visual reaction time variability (RTv 50–100 ms) and did not show significant changes when returning to the phenylalanine-restricted diet (RTv 70–100 ms). Neither did the concentrations of homovanillic acid (HVA) and 5-hydroxyindoleacetic acid (5-HIAA) in cerebrospinal fluid (CSF) change significantly. Four of the patients, however, performed rather poorly (RTv 120–220 ms) on unrestricted diet and improved significantly (P〈0.03) when the diet was restored (RTv 70–150 ms). The improvements were accompanied by significant (P〈0.01 and P〈0.02) increases (mean 52% and 109%) in CSF levels of HVA and 5-HIAA. Five PKU patients aged 15–23 years were allowed unrestricted diet or unrestricted diet supplemented with various amounts of tyrosine (106–194 mg/kg per 24 h). Two of these patients performed very well on unrestricted diet (RTv 60 ms) and showed little change when the unrestricted diet was supplemented with tyrosine (RTv 70 ms and 80 ms). The three other patients, who performed rather poorly (RTv 120–220 ms), improved significantly (P〈0.03) when the unrestricted diet was supplemented with tyrosine (RTv 70–140 ms). HVA in CSF increased significantly (P〈0.01) with the tyrosine supplement when the amount exceeded a threshold of approximately 80 mg/kg per 24 h. The simultaneous increase in CSF level of 5-HIAA showed a positive correlation (r=0.90; P〈0.02) with the increase in HVA concentration suggesting a functional interrelation between the dopaminergic and the serotoninergic nervous systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00441411
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  • 2
    Electronic Resource
    Electronic Resource
    Corn production as influenced by irrigation and salinity — Utah studies (1978)
    Springer
    Irrigation science 1 (1978), S. 47-59 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This paper reports the results of a two-year field study at Logan, Utah which was one of a series of similar experiments carried out at Ft. Collins, Colorado, Davis, California and Yuma, Arizona. A range of water application rates were imposed using the line-source system (Hanks et al., 1976) and in some treatments water was withheld during certain growth stages. Salinity variables were imposed by presalinization before planting and by the use of saline irrigation water. Regardless of irrigation or salinity regime, corn grain and total dry matter production were linearly related to evapotranspiration, which was measured as the sum of irrigation, rainfall and soil water depletion minus drainage. Presalinization of the soil decreased yields in proportion to the salinity imposed, the decrease being associated with reductions in evapotranspiration caused by reduced soil water depletion as compared to the nonsalinized treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00269007
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Biopterin, neopterin and tyrosine responses to combined oral phenylalanine and tetrahydrobiopterin loading tests in two normal children and in a girl with partial biopterin deficiency (1985)
    Springer
    Journal of inherited metabolic disease 8 (1985), S. 95-96 
    Details
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01811475
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    Paper (German National Licenses)
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