Urea measurement by X-ray microanalysis in 50 picoliter specimens
نویسندگان
چکیده
منابع مشابه
X-Ray microanalysis of stratified specimens
This paper presents a description of the state of the art methodology and software for the application of x-ray microanalysis to thin surface layers and more generally to the characterization of stratified specimens. The sensitivity of the technique to near-surface segregation is demonstrated. Some emphasis is given on the eS(pz) function (the distribution in depth of the primary generated x-ra...
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The use of ion exchange beads is proposed as standards for the estimation of various elements in biological tissues. Elements to be detected or quantitated in biological tissues occur in three forms: as free ions or salts, in a crystalline phase, and bound to a matrix. For the latter category a standard system using ChelexlOO -jon exchange beads is proposed. Cations can be attached in a control...
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In a thin specimen X-ray absorption and fluorescence can, to a first approximation, be ignored and the observed X-ray intensity ratios, Ia/Ie, can be converted into weight fraction ratios, CA/CB, by multiplying by a constant kaB; CA/C B = kAB I A/IB. kAB values can be calculated or determined experimentally. The major correction which may have to be made to the calculated weight fraction ratio ...
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ژورنال
عنوان ژورنال: Kidney International
سال: 1977
ISSN: 0085-2538
DOI: 10.1038/ki.1977.135