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Sterol is an organic compound [1] with formula C 17 H 28 O , whose molecule is derived from that of gonane by replacement of a hydrogen atom on C3 position by a hydroxyl group.
A chart or table of nuclides maps the nuclear, or radioactive, behavior of nuclides, as it distinguishes the isotopes of an element.It contrasts with a periodic table, which only maps their chemical behavior, since isotopes (nuclides that are variants of the same element) do not differ chemically to any significant degree, with the exception of hydrogen.
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Nuclear stability is limited to those combinations of protons and neutrons described by the chart of the nuclides, also called the valley of stability.The boundaries of this valley are the neutron drip line on the neutron-rich side, and the proton drip line on the proton-rich side. [2]
The predominant sterol in fungal cell membranes is ergosterol. [46] Sterols are steroids in which one of the hydrogen atoms is substituted with a hydroxyl group, at position 3 in the carbon chain. They have in common with steroids the same fused four-ring core structure.
Of the known chemical elements, 80 elements have at least one stable nuclide. These comprise the first 82 elements from hydrogen to lead, with the two exceptions, technetium (element 43) and promethium (element 61), that do not have any stable nuclides.
In this chart of nuclides, isobars occur along diagonal lines running from the lower right to upper left.The line of beta stability includes the observationally stable nuclides shown in black; disconnected 'islands' are a consequence of the Mattauch isobar rule.