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  • arsenic  (2)
  • proteins  (2)
  • Dinucleotides  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Human Evolution 14 (1985), S. 725-738 
    ISSN: 0047-2484
    Keywords: Faroes ; blood groups ; enzymes ; genetic distance ; polymorphism ; proteins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Human Evolution 14 (1985), S. 725-738 
    ISSN: 0047-2484
    Keywords: Faroes ; blood groups ; enzymes ; genetic distance ; polymorphism ; proteins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-1432
    Keywords: Human genome ; Dinucleotides ; Introns ; II-III codon positions ; G + C content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have studied the behavior of the dinucleotide preferences under G + C content variation in human genes. The doublet preferences for each dinucleotide were compared between two functionally distinct zones in genes, the II-III codon positions, and the introns. The 16 dinucleotides have been tentatively classified in three groups: AA, AC, CC, CT, and GA, doublets showing no difference between introns and II-III codon positions in the full range of G + C variation TG and TA, which differ in the full range of G + C variation AT, AG, GT, TC, TT, GG, GC, CG, and CA, which show differences in regions over 50% G + C A remarkable pattern observed concerns the behavior of GG, GC, and TC, which showed opposite trends in II-III codon positions and in introns. If codon positions and introns are under the same structural requirements and the same mutational bias, our results indicate that the differences observed could be related to post-transcriptional constraints acting on mRNA.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-5036
    Keywords: arsenic ; phytotoxicity ; speciation ; rice ; straighthead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Arsenic absorption by rice (Oryza sativa, L.) in relation to the chemical form and concentration of arsenic added in nutrient solution was examined. A 4 × 3 × 2 factorial experiment was conducted with treatments consisting of four arsenic chemical forms [arsenite, As(III); arsenate, As(V); monomethyl arsenic acid, MMAA; and dimethyl arsenic acid, DMAA], three arsenic concentrations [0.05, 0.2, and 0.8 mg As L-1], and two cultivars [Lemont and Mercury] with a different degree of susceptibility to straighthead, a physiological disease attributed to arsenic toxicity. Two controls, one for each cultivar, were also included. Arsenic phytoavailability and phytotoxicity are determined primarily by the arsenic chemical form present. Application of DMAA increased total dry matter production. While application of As(V) did not affect plant growth, both As(III) and MMAA were phytotoxic to rice. Availability of arsenic to rice followed the trend: DMAA〈As(V)〈MMAA〈As(III). Upon absorption, DMAA was readily translocated to the shoot. Arsenic(III), As(V), and MMAA accumulated in the roots. With increased arsenic application rates the arsenic shoot/root concentration decreased for the As(III) and As(V) treatments. Monomethyl arsenic acid (MMAA), however, was translocated to the shoot upon increased application. The observed differential absorption and translocation of arsenic chemical forms by rice is possibly responsible for the straighthead disorder attributed to arsenic.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 152 (1993), S. 245-253 
    ISSN: 1573-5036
    Keywords: arsenic ; phytoavailability ; rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Arsenic absorption by rice (Oryza sativa, L.) in relation to As chemical form present in soil solution was examined. Rice plants were grown in soil suspensions equilibrated under selected conditions of redox and pH, affecting arsenic solubility and speciation. A decrease in pH led to higher dissolved arsenic concentrations. When the soil redox potential dropped below 0 mV, most of the arsenic was present as As(III). Under more oxidizing conditions both As(III) and As(V) are present. Chemical speciation of As in the watersoluble fraction affected its phytoavailability. Most indigenous arsenic taken up by the plants remained in the root. Plant arsenic availability increased with increasing arsenic concentration in solution (lower soil pH) and with increasing amounts of soluble As(III) (lower soil redox). We also studied the uptake of monomethyl arsenic acid (MMAA), a widely used defoliant and herbicide, as affected by soil redox-pH condition. Amended MMAA was approximately two times more phytoavailable than the indigenous inorganic As forms and increased with decreasing pH and redox.
    Type of Medium: Electronic Resource
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