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An In Vitro Skin Irritation Test (SIT) using the EpiDerm Reconstructed Human Epidermal (RHE) Model
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An In Vitro Skin Irritation Test (SIT) using the EpiDerm Reconstructed Human Epidermal (RHE) Model

Published on: July 13, 2009

[Determination of alkali resistance by skin patch testing]

K Fritz, M Römer, G Veltman

    Zeitschrift Fur Hautkrankheiten
    |October 15, 1985
    PubMed

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    Alkali Metals03:06

    Alkali Metals

    Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
    Table 1: Properties of the alkali metals
    Extraction: Effects of pH00:53

    Extraction: Effects of pH

    Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...