In order to identify plant genes involved in the Rhizobium/legume root nodule symbiosis, host gene expression during soybean nodule development was studied. The hybridization of complementary DNA (cDNA) probes with homologous and heterologous polyadenylated polysomal RNAs showed that most of the 20,000-25,000 RNA sequences expressed were common to uninfected root and nodule tissues. There was a marked increase in the relative concentration of leghaemoglobin and moderately abundant nodule sequences following infection by Rhizobium. A nodule-specific cDNA probe (NS-cDNA), prepared by eliminating common root sequences by cascade hydroxylapatite chromatography, was used to characterize a small population of nodule-specific sequences. Hybridization of NS-cDNA to DNA from soybean embryos and not to Rhizobium demonstrated that these sequences are encoded by the host genome. Hybridization with nuclear RNA from uninfected tissues showed that the primary mode of regulation of these sequences is at the level of transcription. Expression of these small nodule-specific-mRNAs is differentially modulated by ineffective strains of Rhizobium. The relative concentration of nodule-specific and common moderately abundant sequences increased to varying extents, in parallel with leghaemoglobin, reaching a peak when nitrogen fixation commences. These data suggest that host gene expression is coordinately regulated during early nodule development. Indoleacetic acid appeared to modulate the expression of common moderately abundance sequences, but had no detectable effect upon leghaemoglobin or nodule-specific sequences. Preliminary characterization of 26 cDNA clones indicated that, in addition to leghaemoglobin and other positively regulated sequences, there were two clones whose mRNA concentration decreased during nodule development.

No description available.

Single-visit root canal treatment was first documented in 1887. The controversy and debate within the dental community has been ongoing for over a century without resolution. The concept of evidence-based health practice has provided a structure on which the clinically-relevant questions in this debate can be dealt with systematically. When clinicians are faced with choices of which treatment regimen should be offered to patients, the central issues that should be considered are effectiveness, complications, patient/operator preference/satisfaction, and cost. Systematic review and meta-analysis techniques were used to reach definitive conclusions where high quality primary studies are available. The issue of satisfaction was studied using a quality of life concept, while the issue of cost was addressed by an economic evaluation (cost-minimization analysis). Treatment effectiveness and complications of single- and multiple-visit approach were similar. Patients overwhelmingly preferred single- over multiple-visit treatment with high satisfaction scores for both regimens. Australian endodontists were reluctant to embrace single-visit root canal treatment. Single-visit root canal treatment costs society less than multiple-visit treatment. On balance single-visit treatment offers substantial advantages with no identified adverse effects.

Theses (Ph. D. - Plant Pathology)--University of Arizona, 1982. / Includes bibliographical references (leaves 38-40).

Thesis (M.D.S. 1979) from the Department of Dental Health, University of Adelaide.

Thesis (M.D.S.)--University of Hong Kong, 2008. / Includes bibliographical references (p. 69-81).

Thesis (M.S.)--University of Michigan, Ann Arbor, 1967. / Typescript (carbon copy). Includes bibliographical references (leaves 43-44). Also issued in print.

Thesis (Ph. D.)--University of Minnesota, 1923. / Vita. Reprinted from Minnesota. Agricultural experiment station. Technical bulletin no. 22, 1924. "Literature cited": p. 64-67. Also issued in print.

Thesis (Th. M.)--Calvin Theological Seminary, 1989. / Abstract. Includes bibliographical references (leaves [156]-166).

Thesis (S.T.M.)--Concordia Seminary, 1990. / Includes bibliographical references (leaves 149-158).