Effects of gamma radiation on the growth of Alternaria alternata and on the production of alternariol and alternariol monomethyl ether in sunflower seeds

The objective of the present study was to evaluate the effects of different gamma radiation doses on the growth of Alternaria alternata and on the production of toxins alternariol (AOH), and alternariol monomethyl ether (AME) in sunflower seed samples. After irradiation with 2, 5 and 7 kGy, the spore mass was resuspended in sterile distilled water and the suspension was inoculated into sunflower seeds. The number of colony-forming units per gram (CFU/g) was determined after culture on Dichloran Rose Bengal Chloramphenicol and Dichloran Chloramphenicol Malt Extract Agar. The presence of AOH and AME was investigated by liquid chromatography coupled to mass spectrometry. The radiation doses used resulted in a reduction of the number of A. alternata CFU/g and of AOH and AME levels when compared to the nonirradiated control group. Maximum reduction of the fungus (98.5%) and toxins (99.9%) was observed at a dose of 7 and 5 kGy, respectively. Under the present conditions, gamma radiation was found to be an alternative for the control of A. alternata and, consequently, of AOH and AME production in sunflower seeds. (C) 2009 Elsevier Ltd. All rights reserved.

Production of Australian freshwater crayfish in earthen-based systems using pelleted diets and forage crops as food

Juvenile Cherax destructor (commonly called theyabby) were cultured in earthen-based ponds and tanks for 70–105d, and were fed pellets and/or a forage crop of the perennialwhiteclover, Trifolium repens. Three supplementary feedingstrategies were evaluated. Yabby growth on pellets consistently exceeded (by67–159%) that obtained on clover. Base-line yields for extensiveproduction systems are around 400 kg ha^–1. Thesupplementary addition of T. repens produced yields of 635kg ha^–1 (in ponds) to 1086 kgha^–1 (in tanks). The sequential addition of cut-cloverto tanks stimulated growth to levels approaching those achieved on pellets.Yabbies stocked into ponds at 17 m^–2 and fed 33%protein pellets for 100 d, resulted in a yield of 1117 kgha^–1.Pellet inputs at a rate of 129–249 g m^–2(dry matter) and 38–83 g m^–2 (protein) over70–100 d resulted in acceptable growth and feed utilisationindices. Clover inputs of 534–682 g m–2 (asdry matter) or 84–177 g m^–2 (as protein)produced reasonable growth rates but poor feed utilisation indices. Aconsiderable quantity of the dry matter and protein content of clover waseitherinefficiently utilised or directed into other production pathways. In tanks,clover inputs from 113–296 g m^–2 (drymatter) and 24–54 g m^–2 (protein) weresufficient to maintain high growth rates for 4 weeks, while in ponds, inputs of21 g m^–2 (dry matter) and 4.3 gm^–2 (protein) were sufficient for 3 weeks. During theearly weeks of production no growth advantage was gained by providing pelletstoanimals cultured in forage-based systems. Forage depletion occurred after3–4 weeks and was probably a major growth limiting factor.

Pectinase production by solid fermentation from Aspergillus niger by a new prescription experiment

The Ordos Plateau in China is covered with up to 300,000 ha of peashrub (Caragana) which is the dominant natural vegetation and ideal for fodder production. To exploit peashrub fodder, it is crucially important to optimize the culture conditions, especially culture substrate to produce pectinase complex. In this study, a new prescription process was developed. The process, based on a uniform experimental design, first optimizes the solid substrate and second, after incubation, applies two different temperature treatments (30 °C for the first 30 h and 23°C for the second 42 h) in the fermentation process. A multivariate regression analysis is applied to a number of independent variables (water, wheat bran, rice dextrose, ammonium sulfate, and Tween 80) to develop a predictive model of pectinase activity. A second-degree polynomial model is developed which accounts for an excellent proportion of the explained variation (R² = 97:7%). Using unconstrained mathematical programming, an optimized substrate prescription for pectinase production is subsequently developed. The mathematical analysis revealed that the optimal formula for pectinase production from Aspergillus niger by solid fermentation under the conditions of natural aeration, natural substrate pH (about 6.5), and environmental humidity of 60% is rice dextrose 8%, wheat bran 24%, ammonium sulfate ((NH₄)₂SO₄) 6%, and water 61%. Tween 80 was found to have a negative effect on the production of pectinase in solid substrate. With this substrate prescription, pectinase produced by solid fermentation of A. niger reached 36.3 IU/(g DM). Goats fed on the pectinase complex obtain an incremental increase of 0:47 kg day^-1 during the initial 25 days of feeding, which is a very promising new feeding prospect for the local peashrub. It is concluded that the new formula may be very useful for the sustainable development of arid and semiarid pastures such as those of the Ordos Plateau.

Conversations on convergence : insiders' views on news production in the twenty-first century

Convergence is a major topic of discussion at professional and academic journalism conferences and seminars around the world. This book presents the insights of major players and academics in the field of convergence. Here is your chance to read what the experts think about one of the most significant changes that journalism faces. It should be on the desk of all managers keen to know where the future will take us, and on the reading list of every student of journalism and media.

Educational research in a global economy of knowledge production : what troubles a traveling textworker?

The first (and most specific) postcolonial intersection to which this paper refers was constituted initially by an Australian-South African institutional links project (funded by the Australian federal government) and subsequent collaborations and partnerships between Australian and South African academics arising (directly or indirectly) from this project. In this paper I will focus on activities that were intended to enhance research capacity in educational leadership and in environmental education, with particular reference to appropriate methodologies and supervision practices. Other postcolonial intersections to which this paper will refer include those that have been formed as a result of international students from various locations in Africa and Asia studying at Deakin (either on-campus or by distance modes). My purposes in the paper are (i) to examine, through cases and examples, some ways in which difference (with particular reference to race, ethnicity, language and location) might be linked to individual and/or community dispositions to take up (or to reject) specific research methodologies and epistemologies, and (ii) to consider the implications of such differences and dispositions for academic practices directed towards developing 'communities of understanding' at postcolonial intersections.

The manifestation of varieties of blended learning pedagogy (BLP) : interplay between academic, institutional and global pedagogy

Despite the increased recognition of the potential use of online technologies to deliver flexible and student-centered learning environments in higher education, there are numerous critiques that its usage does not transform the daily practices of teaching and learning. This paper draws on some of the findings from three case studies that explored the manifestation of blended learning pedagogies (BLP). Six academics teaching at three different higher education contexts at two different countries, namely Australia and Malaysia were interviewed. The study aimed to interrogate the different manifestation of BLP at the different contexts of higher education, highlighting the complex interplay between the users (academics), technology and the specific socio-cultural contexts. Focusing on the academic identities that are shaped and reshaped within its socio-cultural context, this study demonstrated the complexity and fluidity of the manifestation of the different varieties of BLP. It contributes to further understanding the ways in which online technologies are used in teaching and learning within context of global knowledge economy that emphasizes flexibility and active co-production of knowledge.

The interaction of discipline and culture in academic writing

Work in contrastive rhetoric has often sought to examine the impact of culturally-based writing conventions on text production and has outlined cultural differences in texts in different languages. At the same time. the study of specialised languages has often claimed a degree of uniformity in text construction both at the level of culture and at the level of the discipline. It appears however that approaches which consider just culture or just discipline miss part of the picture. This paper argues that considerations of discipline and culture are. complex and interrelated and that this complexity and interrelationship can be seen at several different levels in specialised academic texts.

Operationalising persona : the academic public identity

Academics operate semi-autonomously: On one level they are believed to be independent experts in their field of study and both impart their knowledge to students and to other academics. On another level, they are employees in an elaborate system of higher education where the expectations are constantly there to connect to university strategic plans and to adopt the discourse of their institution in order that they might rise in the ranks and esteem within their microworlds. The contemporary academic identity can resemble what has emerged in the world of entertainment, sport and politics: a career driven by recognition, a sense of trying to draw attention to one’s work, and a constant effort to build reputation. By implication, the university benefits from the success that their academics achieve in reaching for these ends.

Very little research has engaged how academics manage their reputation and their personas in this elaborate higher education prestige economy. Academics work to define their identities as teachers and there are efforts by individual academics to build their teaching persona. Likewise, academics generally try to
produce a research persona that may intersect with their teaching identities, but is constituted quite differently through connection to peers and evaluation by leaders in their fields. They may even try to build a reputation for “service” and administration within their institution that defines a third kind of persona. Overlaying all of this work is the way that reputations can be built has shifted somewhat in the era of online culture and social media. The contemporary academic now must often build a persona through the techniques of connection
and networking that are now privileged in the knowledge economy. With universities imagining that they are operating at the centre of the production of the future of the knowledge economy, academics are now at the forefront of online reputation management - in other words, they need to construct their public persona
online.

This paper reports a study of 15 academics and how they are managing and building their online academic persona. The study operated with a certain pragmatism: it asked academics what they were currently doing online and asked what they would like to do to manage their reputations. Through a longitudinal study of their online engagements, the study looked at how they could alter/improve their management and reputation online. This paper will include commentary from one of the participants in the project and then an open discussion about the contemporary academic persona.

Use of the wound-inducible NtQPT2 promoter from Nicotiana tabacum for production of a plant-made vaccine

The wound-inducible quinolinate phosphoribosyl transferase promoter from Nicotiana tabacum (NtQPT2) was assessed for its capacity to produce B-subunit of the heat-labile toxin (LTB) from enterotoxigenic Escherichia coli in transgenic plant tissues. Comparisons were made with the widely used and constitutive Cauliflower Mosaic Virus 35S (CaMV35S) promoter. The NtQPT2 promoter produced somewhat lower average concentrations of LTB protein per unit weight of hairy root tissue but allowed better growth thereby producing similar or higher overall average yields of LTB per culture batch. Transgenic tobacco plants containing the NtQPT2-LTB construct contained LTB protein in roots but not leaves. Moreover, wounding NtQPT2-LTB transgenic plants, by removal of apices, resulted in an approximate 500% increase in LTB levels in roots when analysed several days later. CaMV35S-LTB transgenic plants contained LTB protein in leaves and roots but wounding made no difference to their LTB content.

The films of John Hughes: a history of independent screen production in Australia

ABSTRACTIn The Films of John Hughes: A history of independent screen production in Australia filmmaker and academic John Cumming tells the ongoing story of Hughes’ work illustrating the delicate balance of individual, collective and corporate agendas that many contemporary artists need to negotiate. This story begins in the 1960s with a generation of intelligent, socially engaged young people who challenge established power structures, conventions and stereotypes in art, politics and the media. Experiments were being made with grassroots democracy, with new social formations and new ways of seeing and communicating. The book also pays attention to earlier periods of cultural and political activism that captured Hughes’ imagination in the 1970s and became the subject of a number of his films over a period of nearly forty years. Through these films Cumming traces the outline of post-war film culture and production in Melbourne from the 1940s and sets this history within the context of international trends in independent filmmaking throughout the 20th Century and into the 21st.The work of an independent filmmaker has always included a great deal more than directing films. Working in an artisanal mode, he or she often performs, or has a hand in, every aspect of craft at the same time as engaging in discussion and organisation around the wider sphere of screen culture and industry. In addition to having proficiency as a producer, photographer, sound recordist, editor, distributor and exhibitor of films, there is research, organisation, lobbying, entrepreneurship and mentoring to be done. As an independent producer-director, John Hughes has engaged in all of these activities – often simultaneously. He is also a scholar, writer, organiser, activist and teacher. As a television bureaucrat he was both eminent and innovative, and through his filmmaking he has become a leading historian of Australian documentary cinema. ‘… that view – that art and politics are inherently at odds – is still lurking around. It is at the heart of cultural conservatism; and John Hughes’s film-making, from the 1970s to the present, confounds its proponents. His cinema is at once crowded, detailed, elegant and absolutely lucid; at the same time, it is shot through with political and historical understandings.’ Sylvia Lawson, ‘Such a Bloody Wonderful Place’, Inside Story, 28 April 2013.

Understanding the emerging contemporary public intellectual: Online academic persona and The Conversation

At its core, the power of the public intellectual is the capacity to make ideas move through a culture. This article looks at what kind of academic persona – that is, what kind of public self whose original status comes from intellectual work and thinking – navigates effectively through online culture and communicates ideas in the contemporary moment. Part of the article reports on a research project that has studied academic personas online and explores what can be described as ‘registers of online performance’ that they inhabit through their online selves. The research reveals that public intellectuals have to interpret effectively that online culture privileges what is identified as ‘presentational media’: the individual as opposed to the media is the channel through which information moves and is exchanged online, and it is essentially a presentation of the self that has to be integrated into the ideas and messages. From this initial analysis/categorisation of academic persona online, the article investigates the online magazine The Conversation, which blends journalism with academic expertise in its production of news stories. The article concludes with some of the key elements that are part of the power of the public intellectual online.

Weed interference on coffee fruit production during a four-year investigation after planting

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Comparative biology and production costs of Podisus nigrispinus (Hemiptera: Pentatomidae) when fed different types of prey

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)