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Predicting age-age genetic correlations in tree-breeding programs: a case study of Pinus taeda L. (2000)

Gwaze, D. P. ; Bridgwater, F. E. ; Byram, T. D. ; [et al.]

Springer

Theoretical and applied genetics 100 (2000), S. 199-206

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ISSN: 1432-2242

Keywords: Key words Age-age genetic correlations ; Phenotypic correlations ; Conifers ; Tree breeding ; Woody perennials

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract A meta-analysis of 520 parents and 51,439 individuals was used to develop two equations for predicting age-age genetic correlations in Pinus taeda L. Genetic and phenotypic family mean correlations and heritabilities were estimated for ages ranging from 2 to 25 years on 31 sites in the southern U.S. and Zimbabwe. Equations for predicting age-age correlations based on P. taeda populations from west and east of the Mississippi River proved statistically different. Both predictive equations proved conservative for validation datasets consisting of younger tests in the U.S. and Zimbabwe. Age-dependent log-linear predictive equations were favored over growth-dependent equations. All P. taeda predictive equations based on genetic correlations favored earlier selection when compared to a generalized conifer predictive equation based on phenotypic correlations. The age-age correlations structure showed stability independent of planting density and across a wide range of family sizes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s001220050027

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Mass spectrometry of benzylamines and benzylamine derivatives (1972)

Couch, M. W. ; Williams, C. M.

Chichester : Wiley-Blackwell

Biological Mass Spectrometry 6 (1972), S. 21-32

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ISSN: 0030-493X

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The mass spectra of benzylamine, N-ethylbenzylamine, N,N-dimethylbenzylamine, p-methoxybenzylamine and 4-hydroxy-3-methoxybenzylamine, and their acetamide and trimethyl- silyl (TMS) derivatives have been recorded. Low and high resolution spectroscopy were employed in conjunction with ion kinetic energy (IKE) determinations to establish the empirical formulae of the fragment ions and their modes of fragmentation. In the case of the acetamide derivatives the acyl group is lost by acetoxy elimination giving rise to the [M - 1] ion of the parent amine which then undergoes fragmentation very similar to the original amine. The TMS derivatives present more complex fragmentation patterns which involve rearrangement of the TMS side chain during decomposition. Consequently the acetamide derivative of an unknown aromatic amine is preferred for diagnostic purposes.

Additional Material: 3 Ill.