ADC Specifications

For a spectrum measured between v ax and Vmin at a resolution of Av, there are M resolution elements, where 

Let us consider what spectral dynamic range can be accommodated by a 16-bit 

A 16-bit ADC has a resolution of 2 (65,536), but at least 1 bit is needed for noise, so the effective resolution is 2 (32,768). A mid-infrared spectrum that has a bandpass of 3600 cm (4000 to 400 cm ) and is recorded at a resolution of 4 cm has 900 resolution elements (3600/4). If the spectrum is assumed to have the same intensity at all wavenumbers, the dynamic range of the interferogram can be approximated by the square root of the number of resolution elements (M multiplied by the dynamic range of the spectrum. Thus, the dynamic range of the spectrum is the resolution of the ADC ( 30,000) divided by (30), 

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As in Nicotiana, it was debatable whether ADC or ODC might provide the putrescine incorporated. This possibility was tested by growing roots in the presence of DFMO and DFMA (Robins and Walton, 1993) in experiments analogous to those performed in Nicotiana. Inhibition of ADC specifically depressed hyoscyamine accumulation and the pools of intermediates, indicating that ADC might be more important for the tropane alkaloid pathway. 

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