Edible oil from Tiger nut (Cyperus esculentus L.): mechanical pressing and aqueous enzymatic extraction methods

The tiger nut tuber of the Cyperus esculentus L. plant is an unusual storage system with similar amounts of starch and lipid. The extraction of its oil employing both mechanical pressing and aqueous enzymatic extraction (AEE) methods was investigated and an examination of the resulting products was carried out. The effects of particle size and moisture content of the tuber on the yield of tiger nut oil with pressing were initially studied. Smaller particles were found to enhance oil yields while a range of moisture content was observed to favour higher oil yields. When samples were first subjected to high pressures up to 700 MPa before pressing at 38 MPa there was no increase in the oil yields. Ground samples incubated with a mixture of α- Amylase, Alcalase, and Viscozyme (a mixture of cell wall degrading enzyme) as a pre-treatment, increased oil yield by pressing and 90% of oil was recovered as a result. When aqueous enzymatic extraction was carried out on ground samples, the use of α- Amylase, Alcalase, and Celluclast independently improved extraction oil yields compared to oil extraction without enzymes by 34.5, 23.4 and 14.7% respectively. A mixture of the three enzymes further augmented the oil yield and different operational factors were individually studied for their effects on the process. These include time, total mixed enzyme concentration, linear agitation speed, and solid-liquid ratio. The largest oil yields were obtained with a solid-liquid ratio of 1:6, mixed enzyme concentration of 1% (w/w) and 6 h incubation time although the longer time allowed for the formation of an emulsion. Using stationary samples during incubation surprisingly gave the highest oil yields, and this was observed to be as a result of gravity separation occurring during agitation. Furthermore, the use of high pressure processing up to 300 MPa as a pre-treatment enhanced oil yields but additional pressure increments had a detrimental effect. The quality of oils recovered from both mechanical and aqueous enzymatic extraction based on the percentage free fatty acid (% FFA) and peroxide values (PV) all reflected the good stabilities of the oils with the highest % FFA of 1.8 and PV of 1.7. The fatty acid profiles of all oils also remained unchanged. The level of tocopherols in oils were enhanced with both enzyme aided pressing (EAP) and high pressure processing before AEE. Analysis on the residual meals revealed DP 3 and DP 4 oligosaccharides present in EAP samples but these would require further assessment on their identity and quality.

Stress, time pressure, and decision making

This study surveys parents with children who are deaf or hard of hearing from one private school in St. Louis, Missouri. The issue of stress and time pressure on decision making is addressed and the importance of how stress and time pressure effect parents’ decisions regarding their children who are deaf and hard of hearing.

Language and Identity at School and at Home : Language Shift among Mennonites in Paraguay

This essay has investigated the question of an ongoing language shift from Plattdeutsch and German to Spanish among the Mennonites in Paraguay and the role of the school in this process. The aims of the study were to compare the use of languages among the Mennonites in Asuncion and in the Menno colony and to identify the importance that parents give to the languages and to compare this with a school leader perspective. The aim was also to identify factors that influence the language shift and identify the influence that the shift excerpts on Mennonite values and identity. The results are based on my own observations, interviews with Mennonite women and interviews with key informants who have insight into the school policy issues. The outcome may be used as a basis for educational and language planning. There is a need to consciously sit down and re-define the Mennonite identity and to make the community and the school aware of their responsibility in language maintenance.

Animalism and Person as a Basic Sort

In this paper Animalism is analysed. It will be argued that Animalism is correct in claiming (i) that being of a certain sort of animal S is a fundamental individuative substance sortal concept (animal of the species Homo Sapiens), (ii) that this implies that Animalism is correct in claiming that persons such as us are, by necessity, human beings, (iii) that remaining the same animal is a necessary condition for our identity over time. Contrary to Animalism it will be argued that this does not imply that person should be understood as a phased sortal concept. It will be argued that Animalism rests upon a prior conception of person, and that this implies that person must be understood as a basic substance sortal concept through which we have to individuate ourselves and others. It is further argued that this, together with the insights of Animalism, implies that persons, by necessity, are beings of a biological nature.

A displaced Britishness: Welsh Patagonians in Canada and Australia

This paper focuses on a unique group of British emigrants in their double migration experience from Wales to Patagonia in the second half of the nineteenth century and thence to Canada or Australia in the early twentieth. The history of the Welsh Patagonian settlements in the Chubut Valley of Argentina and the Andes foothills has been extensively documented. Less is known about the two subsequent migrations from Patagonia to Canada in 1902, and from Patagonia to Australia between 1910 and 1915. What distinguishes these movements is that, in each case, the settlers migrated as a group and placed a high priority on taking up adjoining land. In their three adopted countries they established discrete Welsh communities, some more enduring than others.

There is a general consensus that the initial move from Wales to Patagonia in 1865 was for nationalistic, cultural and linguistic reasons but for those who followed later, economic motives were more common. By the time of the migration from Patagonia to Canada in 1902, there was no illusion that Welsh nationalism could be preserved intact or autonomy guaranteed. Historians dispute the primary motivation for this particular move, some arguing that socio-economic and political factors in Patagonia were paramount, others that it resulted from inducements and political manoeuvrings from Canada and Great Britain. What is clear is the desire of the settlers to return to a country 'under a British flag'.

This paper addresses these issues relating to the Welsh Patagonian migration to Canada in the context of a comparison with the migration to Australia some years later. Such a comparative analysis has not previously been undertaken. Notions of identity and an erstwhile ‘Britishness’ are explored, in terms of the migrant’s sense of self and the political implications of citizenship, military service, reception and assimilation in the
host societies.

Corners, squares and urban identities: perceptions, attitudes and values

In February 2000, the new Victorian Labor Government announced that they were removing the western shard from Lab Architecture Studio's winning Melbourne Federation Square design. then under construction. The specific 'contested terrain' at the intersection of Flinders Street and Swanston Street Walk. Melbourne, allows the exploration of the politics of place construction over time, through an examination of Young and Jackson's Hotel [1861]. St Paul's Cathedral [1886). Flinders Street Station [1912]. the Westin Hotel [1999) and Federation Square. This site brings together architectural and social history, questions public space and identity, and looks at Melburnian's perceptions, attitudes and values. It further demonstrates that the fragmentation of the professions, and fragmentary histories. lead to the preservation of 'bits' of architecture and the destruction of the urban/landscape context, jeopardizing the Identity of place.

Why we interview now-reflexivity and perspective in a longitudinal study

This paper discusses a longitudinal, interview-based study of Australian secondary school students that explores the interaction between school ethos and forms of subjectivity. The study was designed to enable prospective and retrospective understandings of identity over time. It is suggested that this methodology encourages a reflexive self-positioning for both participants and researchers and, in the accumulation of an archive of perspectives, responds to poststructuralist critiques of contingency and construction in research interviews. Second, it is argued that the richness of longitudinal research invites more than one kind of analysis, and that working with and across conventionally divergent theoretical approaches can be fruitful. This is discussed with reference to Bourdieu's account of social field and habitus, and Hollway and Jefferson's notion of the 'defended subject'.

Who is `us`? Students negotiating discourses of racism and national identification in Australia

This article explores the political beliefs and the forms of reasoning about racism, national identity and Other developed by young Australian women and men from different ethnic and class backgrounds. The interviews on which the discussion is based are drawn from a larger longitudinal study of Australian secondary school students which examines how young people develop their sense of self and social values over time. The present article has two overall purposes: to add to understandings of how the cultural logic of racism functions in one national setting, and to consider political reasoning about race and ethnicity in relation to processes of young people's identity positioning. Three main lines of argument are developed. The first concerns students' positioning of themselves vis-a `-vis the current 'race debate' in Australia, and in relation to us as researchers, including their negotiation of the protocols for speaking about 'race' and racism. This includes consider ation of the methodological and political effects of white Anglo women asking questions about racism and ethnicity to ethnic minority students who are routinely constituted as 'Other': what blindnesses and silences continue to operate when posing questions about racism directly? A second and related focus is the range of emotional responses evoked by asking questions about racism and about an Australian politician (Pauline Hanson), who has been prominent in race debates. Third, the authors examine young people's construction of 'us and them' binaries and hierarchies of Otherness and whiteness. They argue throughout that reasoning about race, national identity and Others, and the taking up of 'political positions', is intimately linked to identity formation and to how we imagine ourselves in the present, the past and the future.

Indigenous Australian accountants : why so few? A historical and cultural perspective

At a time when there is a growing call for Indigenous Australians to become self-sustainable and self-governing (Smith, 2002, Dodson & Smith, 2003, Martin, 2003) the very small number of Indigenous Australians in the accounting profession raises the question "why so few?" The number of Certified Practicing Accountants and Chartered Accountants of Australia is approximately 150,000 and to date only nine (9) qualified Indigenous Australian accountants have been located, representing 0.006%. This paper analyses the barriers faced by Indigenous Australians within the context of theories of cultral identity and colonisation of Australia. These theories are propounded as a means of exploring why there are so few Indigenous Australians represented in the accounting profession. An overview of colonial rule implemented by the British government from settlement of Australia in 1788, through to modern day Australia will be forwarded in an effort to draw out the implication of colonial rule on the development of Indigenous Australians whilst paying particular attention to the cultural identity of Indigenous Australians and the influence this has had on their career choices.

Of great love and immense hate: the ambivalence of the other in a local/global school

In recent times, and in times of insurgent globalisation, modern notions of identity and with them, conceptions of essential and primordially defined difference seem to have fallen apart. Identity is understood as post-modern, a ‘moveable feast’ of ever-in-process, negotiated differences. The examination of the material and conceptual terms and conditions that position these logics otherwise suggests that these arguments remain tied within conceptions of ourselves made through the ambivalent conceptions of others. In this paper, I trace these paradoxical relations as they are represented in a particular local Melbourne school at each end of a decade and at a time of increasing demographic change and global transformation. Teachers and parents understood and defined their identities and the identities of others in ways that were increasingly fragmented, changing and complex. Beneath these changing patterns, they continued to define others as different and as not us in ways that were ambivalent and extreme. These negotiations took place differently in recent years as the definitions of essential notions of identity changed and became more complex to define. Nevertheless, they continued as ambivalent stories of otherness that transversed the tortuous spectrum between orientalism and nativism speculated upon in post-colonial writings.

A model of superiors and subordinates' aggressive communication in the workplace

In the workplace, superiors and subordinates may engage in a spiral of aggressive communication and emotional reaction that can lead to negative attitudes and unproductive organisational outcomes and higher staff turnover. In the manuscript, we develop and propose a model of superiors' and subordinates' aggressive communication and emotional reactions. In our model we suggest that organisational context (culture) and individual personal characteristics (personality, trust, self-esteem) influence superiors' and subordinates' aggressive communication. We also suggest that individual emotional characteristics (positive/negative affect, emotional intelligence) influence the protagonists' emotional reactions. Finally, we propose that subordinates' emotional reactions and organisational culture influence their attitudes (organisational identity, perception of a masculine vs. feminine organisation) and their considered behaviours (performance, turnover). We conclude with a discussion of potential limitations, and implications for theory, research, and practice.

What about the mother and family when an infant doesn`t sleep?

Becoming a new parent is a time of enormous change in the lifestyle of women, particularly as women are expected to take on prime responsibly for caring for the child. Motherhood can be exhausting and lonely as women cope with the demands of a new baby. These demands are exacerbated when infants do not sleep. This causes many parents to seek professional intervention with persistent infant sleep problems. Through focus group interviews, this study sought to understand the experiences of 28 women and families in how they coped with and managed an infant with sleep problems. Results indicated that women experienced major role confusion as they internalised the image that 'a good mother does it all'. Persistent infant crying and their own sleep deprivation exacerbated their loss of identity and shattered their self image, and caused anger and confusion in some partners. Each woman sought primary health care support through a five day residential stay in an Early Parenting Centre in Victoria. The women found that this professional support facilitated confidence building and feelings of normality. Most important, staff encouraged the women to feel good about themselves and their ability to manage future sleep problems.

Whose identity? Valuing the culture built heritage in diverse and tensioned societies

The UNESCO declaration on cultural diversity in 2002 has raised more questions than answers. More recent events around the World have highlighted the immediate need for legislative actions to protect cultural built heritage in tensioned societies. This paper discusses the potential global risks that face cultural built Heritage. The paper argues that such risks are not only limited to regions where military operations are taking place but also to nations where questions of identity and cultural diversity are raised. The paper questioned the reasons and the impact of the rise of ethno nationalism on the protection of cultural built heritage. The different discourses of these groups that will lead to destruction of cultural artefacts are also explored. In order to properly legislate means for the protection of vulnerable cultural built heritage in conflict areas, the underline value system should be clarified and the values under threat identified. The paper concludes with a plea to move our understanding and definition of culture from the previous 'old' definition with relation to "people' to a 'new' one which is more relevant to context.

Building brand identity : Does it pay? An investigation into cultural and recreational services

This conceptual paper aims to contribute to current services branding literature by conceptualising the relationship between brand identity and critical antecedents and empirically verifying whether the creation of a strong brand identity results in the ultimate pay off in terms of improved organisational performance. A conceptual model is developed in the context of the cultural and recreational services sector and central constructs and subsequent propositions are discussed.

The influence of leisure preference, life priority and making time on regular participation in leisure time physical activity

Using an attitude-behaviour theory approach this study examined the direct and indirect influence of preference, life priority and time allocation on regular participation in leisure-time physical activity (LTPA). The crosssectional study used self-report questionnaires to collect data from a random sample of 250 people aged 19 to 87 years living in an Australian city. The findings suggest that people’s regular participation in LTPA is not directly influenced by their preference for it. Rather, making LTPA a high life priority and allocating time for LTPA are intervening factors that explain the relationship. The outcomes emphasise the importance of encouraging the formation of a preference for physical activity in young children. They suggest all levels of government and the leisure profession emphasise work/life balance by prioritising LTPA, educating people about time management and helping them to develop time management skills.