3,652 research outputs found
Volatile-mediated inhibitory activity of Rhizobacteria as a result of multiple factors interaction: the case of Lysobacter capsici AZ78
No full textPlant beneficial rhizobacteria may antagonize soilborne plant pathogens by producing a vast array of volatile organic compounds (VOCs). The production of these compounds depends on the medium composition used for bacterial cell growth. Accordingly, Lysobacter capsici AZ78 (AZ78) grown on a protein-rich medium was previously found to emit volatile pyrazines with toxic activity against soilborne phypathogenic fungi and oomycetes. However, the discrepancy between the quantity of pyrazines in the gaseous phase and the minimum quantity needed to achieve inhibition of plant pathogens observed, lead us to further investigate the volatile-mediated inhibitory activity of AZ78. Here, we show that, besides VOCs, AZ78 cells produce ammonia in increased amounts when a protein-rich medium is used for bacterial growth. The production of this volatile compound caused the alkalinization of the physically separated culture medium where Rhizoctonia solani was inoculated subsequently. Results achieved in this work clearly demonstrate that VOC, ammonia and the growth medium alkalinization contribute to the overall inhibitory activity of AZ78 against R. solani. Thus, our findings suggest that the volatile-mediated inhibitory activity of rhizobacteria in protein-rich substrates can be regarded as a result of multiple factors interaction, rather than exclusively VOCs productio
Author, Philosopher Alexandra Stoddard to Speak March 2 at Williams Library
No full textOXFORD, Miss. – Contemporary philosopher, author, interior designer and speaker Alexandra Stoddard gives an inspirational lecture and reading March 2 at the University of Mississippi
Stages for the More Sustainable Farm
No full textCurrently, agricultural farm units are faced with a double and most times contradictory challenge, in order to be successful: on the one hand the invested capital has to be profitable and the economic performance has to be maximised. On the other hand, given the socio-environmental situation, it is necessary to preserve and to protect the environment and natural resources. Given the potential conflict of the two aims, since the satisfaction of one implies the underperformance of the other (and vice versa), the question then is: which is the solution to choose? We intend, in this work, to formulate a farm plan with the purpose of reconciling the criteria of environmental sustainability with that of economic competitiveness. For this achievement we proceed to the comparative study of sustainability of different groups of farms identified in the study area (first evaluation cycle) through MESMIS (“Marco para la Evaluación de Sistemas de Manejo de Recursos Naturales Mediante Indicadores de Sustentabilidad” - Framework for Evaluation of Natural-Resource Systems Handling through Sustainability Indicators) methodology, that allowed to select the more sustainable group of farms. Based on the found potentialities and weakness on these production systems, we stepped to the planning of a production unit of bovine meat, which obeys simultaneously to economic and environmental objectives, using Multicriteria Decision. We finished the work with the sustainability evaluation between groups of farms identified previously and the planned farms (second evaluation cycle), based, again, in the MESMIS methodology, to confirm (or not) the greatest sustainability of the last ones. Analyses of the results allow us to confirm the greatest relative sustainability of the planned farm, for the diverse traced scenarios.Decision taking, planning, sustainability, Environmental Economics and Policy, Farm Management,
Exhibiting Fashion Symposium: Dr. Alexandra Palmer “Fashion Exhibitions: The Good, the Bad, and the Pointless”
No full textThe Museum at FIT presented Exhibiting Fashion, its twenty-first academic symposium on Friday, March 8, 2019. This symposium explored the history of fashion curating, the different ways fashion is displayed in museum settings, and how national and regional identities influence fashion exhibitions. The symposium was organized in conjunction with Exhibitionism: 50 Years of The Museum at FIT, which commemorated the rich history of the museum, the site of more than 200 exhibitions since the 1970s.Dr. Alexandra Palmer is the Nora E. Vaughan Senior Curator at the Royal Ontario Museum. She has curated numerous exhibitions including Christian Dior, and she is the author of the book Christian Dior: History and Modernity, 1947–1957
Reescrita de si pelo outro: identidade portuguesa e paródia em Deus-dará, de Alexandra Lucas Coelho / Rewriting oneself through the other: Portuguese identity and parody in Deus-dará, by Alexandra Lucas Coelho
No full textResumo: O artigo aponta o modo como o romance Deus-dará de Alexandra Lucas Coelho, escritora portuguesa contemporânea, pode ser compreendido como um exercício de renegociação da identidade portuguesa em relação a questões referentes à colonização no Brasil. Mais do que isso, problematiza-se como, por meio da estratégia da paródia no texto ficcional, a autora consegue expressar uma necessidade e possibilidade de se redefinir pelo outro em um movimento contrário ao do discurso colonial – o que também ocorre em suas entrevistas e em suas narrativas de viagens, tais como em Vai, Brasil e Cinco Voltas na Bahia e um beijo para Caetano Veloso. Palavras-chave: identidade portuguesa; paródia; pós-modernismo; escrita portuguesa contemporânea; Alexandra Lucas Coelho. Abstract: The article observes how the novel Deus-dará, by Alexandra Lucas Coelho, a Portuguese contemporary writer consists in an exercise of renegotiation for the Portuguese identity in relation to issues that refer to the colonization process in Brazil. Moreover, this text seeks to show how parody as a fictional literary strategy helps the author in expressing a necessity and a possibility of redefining oneself through the other, in a direction that goes in the opposite way of the colonial speech. This necessity and this possibility also appear in the author’s interviews and travel books, such as Vai, Brasil and Cinco Voltas na Bahia e um beijo para Caetano Veloso, which will also be mentioned in this article.Keywords: Portuguese identity; parody; post-modernism; Portuguese contemporary writing; Alexandra Lucas Coelho
Author Rights Workshop
No full textLearning material associated with Alexandra Kohn's presentation as a part of the ABC Copyright 2020 Fall Speaker Series, hosted by the University of Alberta Copyright Office
Downy mildew symptoms on grapevines can be reduced by volatile organic compounds of resistant genotypes
No full textVolatile organic compounds (VOCs) play a crucial role in the communication of plants with other
organisms and are possible mediators of plant defence against phytopathogens. Although the role
of non-volatile secondary metabolites has been largely characterised in resistant genotypes, the
contribution of VOCs to grapevine defence mechanisms against downy mildew (caused by Plasmopara
viticola) has not yet been investigated. In this study, more than 50 VOCs from grapevine leaves
were annotated/identifed by headspace-solid-phase microextraction gas chromatography-mass
spectrometry analysis. Following P. viticola inoculation, the abundance of most of these VOCs was
higher in resistant (BC4, Kober 5BB, SO4 and Solaris) than in susceptible (Pinot noir) genotypes.
The post-inoculation mechanism included the accumulation of 2-ethylfuran, 2-phenylethanol,
β-caryophyllene, β-cyclocitral, β-selinene and trans-2-pentenal, which all demonstrated inhibitory
activities against downy mildew infections in water suspensions. Moreover, the development of
downy mildew symptoms was reduced on leaf disks of susceptible grapevines exposed to air treated
with 2-ethylfuran, 2-phenylethanol, β-cyclocitral or trans-2-pentenal, indicating the efcacy of these
VOCs against P. viticola in receiver plant tissues. Our data suggest that VOCs contribute to the defence
mechanisms of resistant grapevines and that they may inhibit the development of downy mildew
symptoms on both emitting and receiving tissues
Athaliah and Alexandra: Gender and Queenship in Josephus [Author Accepted Manuscript]
No full textAthaliah and Alexandra were the only two women to rule as queens of Judah/Judaea in their own right and both women’s reigns are reported in Josephus’ writings. Despite their uniqueness, however, Athaliah and Alexandra are rarely compared in scholarship; the former is usually dismissed, and focus centred on the latter. This article contends that there are historical similarities between the two, but literary differences. Josephus could have referred to Athaliah or used elements of her portrayal in his presentation of Alexandra but does not, creating the impression that Alexandra was completely different to her predecessor. It may be instructive, therefore, to consider why Josephus literarily isolates the queens and what this means for his interpretation of Alexandra
Ferromagnetism and magnetic anisotropy in exfoliated flakes of CrTe2
No full textAuthor Alexandra Wagner, BScMasterarbeit Johannes Kepler Universität Linz 202
spp. volatile organic compounds protect grapevine plants by activating defense‐related processes against downy mildew
No full textVolatile organic compounds (VOCs) are produced by soil-borne microorganisms and play crucial roles in fungal interactions with plants and phytopathogens. Although VOCs have been characterized in Trichoderma spp., the mechanisms against phytopathogens strongly differ according to the strain and pathosystem. This study aimed at characterizing VOCs produced by three Trichoderma strains used as biofungicides and to investigate their effects against grapevine downy mildew (caused by Plasmopara viticola). A VOC-mediated reduction of downy mildew severity was found in leaf disks treated with Trichoderma asperellum T34 (T34), T. harzianum T39 (T39) and T. atroviride SC1 (SC1) and 31 compounds were detected by head space-solid phase microextraction gas chromatography-mass spectrometry. Among the Trichoderma VOCs annotated, -farnesene, cadinene, 1,3-octadiene, 2-pentylfuran and 6-pentyl-2H-pyran-2-one reduced downy mildew severity on grapevine leaf disks. In particular, 6-pentyl-2H-pyran-2-one and 2-pentylfuran increased the accumulation of callose and enhanced the modulation of defence-related genes after P. viticola inoculation, indicating an induction of grapevine defence mechanisms. Moreover, 6-pentyl-2H-pyran-2-one activated the hypersensitive response after P. viticola inoculation, possibly to reinforce the grapevine defence reaction. These results indicate that Trichoderma VOCs can induce grapevine resistance, and these molecules could be further applied to control grapevine downy mildew
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