A process for preparing .beta.-carotene, represented by Formula 3 ##STR1## staring from a sulfone compound of Formula B ##STR2##

Un proceso para preparar el beta.-caroteno, representado por el ## del ## STR1 de Formula 3 que mira fijamente de un compuesto del sulfone del ## del ## STR2 del fórmula B

 
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> Method and device for measuring the absorption of radiation in a portion of tissue

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