372 research outputs found

    Light in August: Platonic Parody and Paradox

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    This thesis examines William Faulkner\u27 s aesthetic rendering of Plato\u27s ideas in The Republic within Light in August. It asks, given Faulkner\u27s persistent rejection of ideas and ideologies, where and why are they in the novel? It is suggested that the text is imbued with a Greek and Hellenic aura consistently invoking Platonic Absolute Idealism. Faulkner \u27 s insistence upon the future relevance of his works is used to challenge conventional interpretation as merely repressive patriarchal, religious, and racial codes of the tum of the century American South. The argument proposes another view that accommodates a future ideological matrix of Faulkner\u27 s sought after audience, The Jones of 4057. Faulkner\u27 s invocation of The Republic and Plato\u27s seminal allegory of the Cave offer more than a formula and deductive theory of Light in August, and suggests a conceptual unity under which divergent plurisignation of other systems of thought might be timelessly subsumed. The argument is advanced that Light in August does not use Plato \u27 s allegory and epistemological theory to depict victimizing oppressive ideological forces , but rather oppressive ideological forces are the inevitable end of absolute idealism found in Platonism. Faulkner does not reverently use Platonism in Light in August; instead, he doggedly uses Light in August to indict Platonism. There is a specific symbol matrix shared between Plato\u27s Cave and Light in August that is identified, explicated, and proposes Light in August as an anti-Platonic text. The novel\u27s irreverent and ubiquitous infusion of Platonic symbol and theory suggests a unity in its persistent rejection of Absolute Idealism. Bakhtinian hybridization within Light in August is explored revealing a Faulknerian non-authoritarian and Platonic authoritarian heteroglossia which character, plot, and structure are in service. A critical examination of the novel\u27 s symbols argues how the abstract language of the Truth can never quite b e truth; it must be inextricably bound to the visceral language of the everyday. The thesis contends that Faulkner is a strange sort of modernist. invoking something of the ideal, God, virtue, and eternity by wrestling it away from the stranglehold of abstract systems of isolated Idealism. Faulkner\u27s Light in August is not modernism as usual in its eliciting a sense of vital continuum and vital abstraction that includes ideals

    Yang's gravitational theory

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    Yang's pure space equations (C.N. Yang, Phys. Rev. Lett. v.33, p.445 (1974)) generalize Einstein's gravitational equations, while coming from gauge theory. We study these equations from a number of vantage points: summarizing the work done previously, comparing them with the Einstein equations and investigating their properties. In particular, the initial value problem is discussed and a number of results are presented for these equations with common energy-momentum tensors.Comment: 28 pages, to appear in Gen. Rel. Gra

    Jasmonate promotes auxin-induced adventitious rooting in dark-grown Arabidopsis thaliana seedlings and stem thin cell layers by a cross-talk with ethylene signalling and a modulation of xylogenesis

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    Background: Adventitious roots (ARs) are often necessary for plant survival, and essential for successful micropropagation. In Arabidopsis thaliana dark-grown seedlings AR-formation occurs from the hypocotyl and is enhanced by application of indole-3-butyric acid (IBA) combined with kinetin (Kin). The same IBA + Kin-treatment induces AR-formation in thin cell layers (TCLs). Auxin is the main inducer of AR-formation and xylogenesis in numerous species and experimental systems. Xylogenesis is competitive to AR-formation in Arabidopsis hypocotyls and TCLs. Jasmonates (JAs) negatively affect AR-formation in de-etiolated Arabidopsis seedlings, but positively affect both AR-formation and xylogenesis in tobacco dark-grown IBA + Kin TCLs. In Arabidopsis the interplay between JAs and auxin in AR-formation vs xylogenesis needs investigation. In de-etiolated Arabidopsis seedlings, the Auxin Response Factors ARF6 and ARF8 positively regulate AR-formation and ARF17 negatively affects the process, but their role in xylogenesis is unknown. The cross-talk between auxin and ethylene (ET) is also important for AR-formation and xylogenesis, occurring through EIN3/EIL1 signalling pathway. EIN3/EIL1 is the direct link for JA and ET-signalling. The research investigated JA role on AR-formation and xylogenesis in Arabidopsis dark-grown seedlings and TCLs, and the relationship with ET and auxin. The JA-donor methyl-jasmonate (MeJA), and/or the ET precursor 1-aminocyclopropane-1-carboxylic acid were applied, and the response of mutants in JA-synthesis and -signalling, and ET-signalling investigated. Endogenous levels of auxin, JA and JA-related compounds, and ARF6, ARF8 and ARF17 expression were monitored. Results: MeJA, at 0.01 μM, enhances AR-formation, when combined with IBA + Kin, and the response of the early-JA-biosynthesis mutant dde2–2 and the JA-signalling mutant coi1–16 confirmed this result. JA levels early change during TCL-culture, and JA/JA-Ile is immunolocalized in AR-tips and xylogenic cells. The high AR-response of the late JA-biosynthesis mutant opr3 suggests a positive action also of 12-oxophytodienoic acid on AR-formation. The crosstalk between JA and ET-signalling by EIN3/EIL1 is critical for AR-formation, and involves a competitive modulation of xylogenesis. Xylogenesis is enhanced by a MeJA concentration repressing AR-formation, and is positively related to ARF17 expression. Conclusions: The JA concentration-dependent role on AR-formation and xylogenesis, and the interaction with ET opens the way to applications in the micropropagation of recalcitrant species

    Characterization of the Tomato ARF Gene Family Uncovers a Multi-Levels Post-Transcriptional Regulation Including Alternative Splicing

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    Background: The phytohormone auxin is involved in a wide range of developmental processes and auxin signaling is known to modulate the expression of target genes via two types of transcriptional regulators, namely, Aux/IAA and Auxin Response Factors (ARF). ARFs play a major role in transcriptional activation or repression through direct binding to the promoter of auxin-responsive genes. The present study aims at gaining better insight on distinctive structural and functional features among ARF proteins. Results: Building on the most updated tomato (Solanum lycopersicon) reference genome sequence, a comprehensive set of ARF genes was identified, extending the total number of family members to 22. Upon correction of structural annotation inconsistencies, renaming the tomato ARF family members provided a consensus nomenclature for all ARF genes across plant species. In silico search predicted the presence of putative target site for small interfering RNAs within twelve Sl-ARFs while sequence analysis of the 59-leader sequences revealed the presence of potential small uORF regulatory elements. Functional characterization carried out by transactivation assay partitioned tomato ARFs into repressors and activators of auxin-dependent gene transcription. Expression studies identified tomato ARFs potentially involved in the fruit set process. Genome-wide expression profiling using RNA-seq revealed that at least one third of the gene family members display alternative splicing mode of regulation during the flower to fruit transition. Moreover, the regulation of several tomato ARF genes by both ethylene and auxin, suggests their potential contribution to the convergence mechanism between the signaling pathways of these two hormones. Conclusion: All together, the data bring new insight on the complexity of the expression control of Sl-ARF genes at the transcriptional and post-transcriptional levels supporting the hypothesis that these transcriptional mediators might represent one of the main components that enable auxin to regulate a wide range of physiological processes in a highly specific and coordinated manner
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