Home Reference • 70 preguntas curiosas (Las Tres Edades / Nos Gusta Saber) by Ariane Hoffmann, Verena von Keitz, Thomas Liesen, Katja

70 preguntas curiosas (Las Tres Edades / Nos Gusta Saber) by Ariane Hoffmann, Verena von Keitz, Thomas Liesen, Katja

By Ariane Hoffmann, Verena von Keitz, Thomas Liesen, Katja Nellissen, Sascha Ott

¿Por qué somos más altos por l. a. mañana que por l. a. noche? ¿Con qué sueñan los ciegos? ¿cómo se mide l. a. altura de las montañas? ¿Cómo se forma un nudo en l. a. garganta? ¿Cómo sería l. a. Tierra sin los angeles Luna? ¿Por qué a veces se nos pega una canción? ¿por qué las olas siempre llegan a los angeles playa en línea recta? ¿Beben agua los peces? Este sorprendente y divertido libro reúne las respuestas a 70 curiosas preguntas sobre nuestro cuerpo, el mundo animal, las plantas, l. a. ciencia, l. a. tecnología y otras inquietudes o dudas que todos hemos tenido alguna vez.

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E. 1978. Sulfur isotope measurement using SO2 and SF6. Geochim. Cosmochim. Acta, 42, 383-389. K. B. COPLEN US Geological Survey, Reston, Virginia, United States of America Abstract Aliquots of seven different reference materials were distributed for an interlaboratory comparison of stable nitrogen-isotope-ratio measurements. Results from 15 laboratories were compiled and evaluated selectively to yield provisional values of 515N for each material, i, with respect to atmospheric N2 (o1SN,7air). The 515N values reported by the different laboratories are correlated in such a way that some of the major discrepancies may be removed by normalization (/.

3 + 180 1. INTRODUCTION The primary standard for relative nitrogen (N)-isotope-ratio measurements is atmospheric 15 nitrogen (N^ gas, which is widespread and homogeneous and, by convention, has a 5N value of 0%o ([1, 2, 3] and see Appendix A for notation). Despite the long history of Nisotope-ratio measurements in the natural sciences, there has never been a set of common-use secondary reference materials with widely accepted isotopic compositions. Secondary reference materials with a large range of isotopic compositions are essential for reporting or expressing isotopic compositions far from that of the primary standard on normalized scales.

024 * The first column contains the results reported from 17 laboratories b Outliers excluded on the 2a criterion c The final column gives the accepted analyses together with 6m, a„ n and am (= 4. 5 mg portions were taken from the bulk sample of NZ1 and analysed for their sulphur isotopic composition on a VG Micromass 1202E mass spectrometer. 2 %o which is the estimated maximum combined error for our chemical and mass spectrometric processes. Therefore for the sample sizes taken the standard is homogeneous.

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