Bioactive Natural products part E by Atta-Ur-Rahman Atta-Ur-Rahman
By Atta-Ur-Rahman Atta-Ur-Rahman
Ordinary items play an necessary and ongoing position in selling a number of facets of medical development, and lots of elements of easy study courses are in detail with regards to ordinary items. the importance, as a result, of the reports in typical Product Chemistry sequence, edited by means of Professor Atta-ur-Rahman, can't be overvalued. This quantity, based on earlier volumes, provides us with state of the art contributions of significant value.
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Only in a few O-rich AGB stars the magnesium isotopic ratios have been derived showing, however, solar ratios. (2004) attempt to derive these isotopic ratios in C-rich AGB-stars with s-element enhancements. Unfortunately, the very crowded spectral regions available for that, prevented them to derive even upper or lower limits. Therefore, the issue of the 22 Ne neutron source role still remains open from the observational point of view. 2 CNO Isotopes One of the most surprising results concerning the chemical composition of AGB stars is the fact that the overwhelming majority of the galactic C-rich AGBs show a C/O ratio only slightly exceeding the unity.
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The abundance gradient: Fig. 1d). In the latter panel we have also used information coming in part from our spectroscopic work (, ), and in part from literature (, , ). While photometric and spectroscopic metallicities do reasonably agree (the most discrepant cases being NGC6253 for which the spectroscopic value is only preliminary, and 10 A. Bragaglia & M. Tosi Fig. 1. Results based on 17 OC’s: (a) Diﬀerence in magnitude between the red clump and the turn-oﬀ as a function of age; (b) and (c) age distribution with Galactocentric distance or metallicity; (d) radial distribution of metallicity (ﬁlled dots refer to photometric metallicity; when metallicity from high resolution spectroscopy is also available it is represented by asterisks and photometric metallicity by open dots).