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documento electrónico
Article : texto impreso
UCAR, G. ; STACCIOLI, C.G. ; STOLL, M. |Dos tallos bien preservados del fósil Sequoiadendron giganteum excavados en Turquía fueron estudiados utilizando el microscopio electrónico y métodos químicos. El análisis químico incluyó la determinación de los constituyentes principales (ligni[...]
documento electrónico
DANIEL BURKE, Autor ; LINDSEY MACKAY, Autor | 2008Highly accurate measurements of the amount of substance of organic molecules in a test material can be obtained using exactly matched calibration solutions and internal standards that are labeled with stable isotope atoms by measuring the amount[...]Article : texto impreso
La madera fósil de la mina de lignito de S. Barbara ( cuenca del Arno, Italia ) fué investigada para hallar su contenido de terpenos. Se hizo la comparación con las muestras de la misma mina, recientemente identificadas como Taxodioxylon gypsace[...]
texto impreso
ISABELLE SCHMITZ-AFONSO, Autor ; JORGE E. LOYO-ROSALES, Autor ; MARIA DE LA PAZ AVILES, Autor ; BARNETT A. RATTNER, Autor ; CLIFFORD P. RICE, Autor | 2003A quantitative method for the simultaneous determination of octylphenol, nonylphenol and the corresponding ethoxylates (1 to 5) in biota is presented. Extraction methods were developed for egg and fish matrices based on accelerated solvent ext[...]Article : texto impreso
Un método de cromatografía de gases/ espectrometría de masas (GC/MS) ha sido desarrollado para permitir la determinación del contenido de antraquinona de pulpas, papeles, y licores. Un extracto en cloroformo concentrado conteniendo antraquinona [...]
documento electrónico
LUKAS TAUJENIS, Autor ; VILMA OLSAUSKAITE, Autor ; AUDRIUS PADARAUSKAS, Autor | 2014
texto impreso
Hepatotoxic microcystins (MCs) are the most commonly reported cyanotoxins in eutrophic freshwaters. In 1996, human intoxications by MCs caused deaths of 76 patients at Caruaru dialysis centers in Brazil. So far, there have been no direct evidenc[...]
texto impreso
documento electrónico
TAO PANG, Autor ; Z. YUAN, Autor ; Y. DAI, Autor ; CH. WANG, Autor ; J. YANG, Autor ; L. PENG, Autor ; GUOWANG XU, Autor | 2007HPLC-atmospheric pressure chemical ionization MS (HPLC-APCI-MS) was used to screen and identify glycosides in tobacco leaf. MS/MS and MS3 and photodiode array (PDA) detection were also used in the characterization. A total of 12 glycosides were [...]
texto impreso
documento electrónico
KAREN W. PHINNEY, Autor ; RIMMER, CATHERINE, Autor ; JEANICE BROWN THOMAS, Autor ; SANDER, LANE C., Autor ; SHARPLESS, KATHERINE E., Autor ; WISE, STEPHEN A., AutorVitamins are essential to human health, and dietary supplements containing vitamins are widely used by individuals hoping to ensure they have adequate intake of these important nutrients. Measurement of vitamins in nutritional formulations is ne[...]
texto impreso
J. IGNACIO GARCIA ALONSO, Autor ; PABLO RODRÍGUEZ GONZÁLEZ, Autor | Cambridge [REINO UNIDO] : Royal Society of Chemistry | 2013Isotope Dilution Mass Spectrometry (IDMS) has become an essential tool in research laboratories and is increasingly used in routine analysis labs (including environmental, food safety and clinical applications). This is the first textbook to pre[...]
documento electrónico
In this book, I have tried to show the way in which high performance liquid chromatography–mass spectrometry (LC–MS) has developed, somewhat slowly it has to be said, into a powerful hybrid analytical technique.In the first chapter, I have discu[...]
documento electrónico
C. M. COMPADRE, Autor ; R. A. HUSSAIN, Autor ; N. P. NANAYAKKARA, Autor ; J. M. PEZZUTO, Autor ; A. D. KINGHORN, Autor | 1988Steviol (ent-13-hydroxykaur-16-en-19-oic acid), the aglycone of various plant-derived glycoside sweeteners consumed by human populations, is known to be mutagenic toward Salmonella tymphimurium strain TM677 when metabolically activated using a 9[...]
