Mostrando 761 - 780 Resultados de 370,052 Para Buscar '"Standard ', tiempo de consulta: 1.37s Limitar resultados
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  14. 774
    por Canfield, L. Randall, Swanson, Nils
    Publicado 1987
    “…A description is given of the NBS program in which special photodiodes for the far ultraviolet spectral region (5–254 nm) are made available as transfer standards. These detectors are calibrated in terms of quantum efficiency (photoelectrons per incident photon) as a function of wavelength. …”
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    “…This paper describes the preparation, analysis, and certification of a new series of standard samples. These samples consist of commercially pure titanium containing hydrogen at three levels (32 ppm, 98 ppm, and 215 ppm) and have been designated National Bureau of Standards Standard Samples Nos. 352, 353, and 354, respectively.…”
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  17. 777
    por Zamudio, Gabriel S., José, Marco V.
    Publicado 2017
    “…In this work, we determine the biological and mathematical properties that are sufficient and necessary to uniquely determine both the primeval RNY (purine-any base-pyrimidine) code and the standard genetic code (SGC). These properties are: the evolution of the SGC from the RNY code; the degeneracy of both codes, and the non-degeneracy of the assignments of aminoacyl-tRNA synthetases (aaRSs) to amino acids; the wobbling property; the consideration that glycine was the first amino acid; the topological and symmetrical properties of both codes.…”
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    “…Currently, Kazakhstan has no standard requirements and protocols for biomedical organizations. …”
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