Thesis (doctoral)--Sveriges Lantbruksuniversitet, Umeå, 1981. / English summary. Includes bibliographical references (p. 210-220).

This research approach focused on 2x8 and 2x10 lumber sizes, in lengths ranging from 12- to 16t. Lumber sample data collection included: growth rings per inch (RPI), specific gravity (SG) and presence of pith. The lumber was tested in static bending per ASTM D 198. Small clear samples were then cut and used for compression testing using ASTM D 143. Lumber for this project was collected from retail lumber stores across the Southeastern United States. The larger 'host' study focused on generating current material property data from over 2000 southern pine boards to help establish more accurate and up to date lumber standards. The sampling, dubbed the 'production-weighted sampling' procedure, utilized in this study mimics the requirements of ASTM 1990. Moreover, the findings from this study are beneficial for industry and research communities alike as several smaller projects, including this one, highlight advances ranging from new lumber design values to non-destructive testing technique innovations evaluating wood. All data were analyzed using IBM SPSS version 25 software. Bivariate correlations were run in conjunction with linear regressions. Compression parallel to grain (C?) and compression perpendicular to grain (C?) were statistically tested with RPI, SG and the presence/absence of pith as independent variables. Initially, the independent variables were tested across all data for each lumber size. Then, a series of data segmentation techniques were employed among each of the independent variables: RPI, SG and pith presence. For RPI, the segments were categorized: less than 3 RPI, 3 to 5 RPI, and more than 5 RPI. Secondly, SG segments were developed in groups: less than 0.4, 0.4 to 0.5, more than 0.5. Lastly, the pith data were segmented: no pith, pith one end and pith both ends. Compression parallel and perpendicular to grain were not predictable by RPI, although the SG values by RPI segments did exhibit a stronger statistical relationship. The SG segments themselves did not reveal statistical significance; however, the pith segments yielded higher r2 values. For compression parallel to grain, r2 values were almost double than perpendicular to grain r2 values, across all pith segments and both lumber sizes.

We studied genetic polymorphism and phylogeny using nuclear random amplified polymorphic DNA markers (RAPDs) and mitochondrial DNA (mtDNA) restriction fragment length polymorphisms (RFLPs) in the three California Closed-Cone Pines: Pinus attenuata Lemm., P. muricata D. Don, and P. radiata D. Don. A total of 343 to 384 trees derived from 13 populations were analyzed using 13 mitochondria' gene probes and two restriction enzymes, and more than 90 RAPD loci generated by 22 primers. Southern hybridization was used to test homology among comigrating RAPD markers. Segregation analysis and Southern hybridization were carried out to distinguish between RAPD fragments of nuclear and organellar origin. Estimates of genetic diversity and population differentiation, and phylogenetic analyses based on RAPD and RFLP markers, were compared with those based on allozymes from a similar study. Twenty-eight distinct mtDNA haplotypes were detected among the three species. All three species showed limited variability within populations, but strong differentiation among populations. Based on haplotype frequencies, genetic diversity within populations (Hs) averaged 0.22, and population differentiation (GsT and 0) exceeded 0.78. Analysis of molecular variance (AMOVA) also revealed that more than 90% of the variation resided among populations. Species and populations could be readily distinguished by unique haplotypes, often using the combination of only a few probes. Twenty-eight of 30 (93%) comigrating RAPD fragments tested were homologous by Southern hybridization. Hybridization with enriched mtDNA, and chloroplast DNA (cpDNA) clones, identified one fragment as being of mtDNA origin and two as being of cpDNA origin, among 142 RAPD fragments surveyed. RAPD markers revealed moderately higher intrapopulation gene diversity and significantly higher total genetic diversity and population differentiation than did allozyme markers for each species. Simulation analysis to study effects of dominance on RAPD diversity suggested that dominance substantially depressed values of diversity within populations and inflated values of differentiation among populations. By comparison to our empirical analyses, we inferred that the underlying diversity of RAPD markers is substantially greater than that of allozymes. Results of phylogenetic analysis of RAPD markers were largely consistent with those from allozyme analysis, though they had many minor differences. Joint phylogenetic analysis of both the RAPD and allozyme markers strongly supported a common ancestor for P. radiata and P. attenuata, and south to north migration histories for all three species. Dendrograms based on mtDNA analysis, however, strongly disagreed with those based on allozymes, RAPDs, chloroplast DNA and morphological traits, suggesting convergent genome evolution. / Graduation date: 1999

Thesis(M.S.)--Auburn University, 2006. / Abstract. Vita. Includes bibliographic references.

Thesis (Ph. D.)--Oregon State University, 2008. / Includes bibliographical references. Also available via the World Wide Web.

Thesis (M.S.)--Oregon State University, 1990. / Typescript (photocopy). Includes bibliography (leaves 64-67). Also available on the World Wide Web.

No description available.

Thesis (Ph. D.)--Oregon State University, 1984. / Typescript (photocopy). Includes bibliographical references (leaves 52-59). Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1981. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1981. / Typescript (photocopy). Includes bibliographical references (leaves 63-71). Also available on the World Wide Web.