Download Biology by Numbers: An Encouragement to Quantitative by Richard F. Burton PDF

By Richard F. Burton

ISBN-10: 0521576989

ISBN-13: 9780521576987

A realistic undergraduate textbook for maths-shy biology scholars exhibiting how easy maths unearths vital insights.

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The same problem was found by Martins et al. 2. To date, this discrepancy still lacks any explanation, but one might speculate about a relation to magnetic fields, since only low field strengths are necessary to induce significant effects on the wind topology (see above). 2V) with a very large B-field (Tab. 6) is probably affected by the weak wind problem. Clumping in hot star winds was the objective of an international workshop held in Potsdam 2007. The following is only a very brief summary of the status quo.

Translated to the intrinsic vrot distribution, this can be approximated by a Gaussian, with peaks at 100 km s−1 for the LMC and 175 km s−1 for the SMC (Hunter et al. 2008a). The latter value is consistent with the O-/early B-star results from Mokiem et al. (2006). Comparison with evolutionary models: efficiency of rotational mixing. In addition to measuring v sin i, Hunter et al. (2008b) have derived surface abundances, in particular those of nitrogen, which is a key-element for stellar evolution.

The Teff -scale of OB-stars has become lower due to the effects of line- and windblanketing accounted for in present-day atmospheric models. 2. Particularly for supergiants, there is a significant spread in Teff for a given spectral sub-type, probably related to different degrees of mass-loss. 3. For a given spectral sub-type, the effective temperatures of OB-dwarfs increase with decreasing metallicity. 4. The “mass-discrepancy” has been solved for O-sgs, but there are still problems for dwarfs and giants.

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Biology by Numbers: An Encouragement to Quantitative Thinking by Richard F. Burton


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