Copper-dependent iron assimilation pathway in the model photosynthetic eukaryote chlamydomonas reinhardtii

The unicellular green alga Chlamydomonas reinhardtii is a valuable model for studying metal metabolism in a photosynthetic background. A search of the Chlamydomonas expressed sequence tag database led to the identification of several components that form a copper-dependent iron assimilation pathway related to the high-affinity iron uptake pathway defined originally for Saccharomyces cerevisiae. They include a multicopper ferroxidase (encoded by Fox1), an iron permease (encoded by Ftr1), a copper chaperone (encoded by Atx1), and a copper-transporting ATPase. A cDNA, Fer1, encoding ferritin for iron storage also was identified. Expression analysis demonstrated that Fox1 and Ftr1 were coordinately induced by iron deficiency, as were Atx1 and Fer1, although to lesser extents. In addition, Fox1 abundance was regulated at the posttranscriptional level by copper availability. Each component exhibited sequence relationship with its yeast, mammalian, or plant counterparts to various degrees; Atx1 of C. reinhardtii is also functionally related with respect to copper chaperone and antioxidant activities. Fox1 is most highly related to the mammalian homologues hephaestin and ceruloplasmin; its occurrence and pattern of expression in Chlamydomonas indicate, for the first time, a role for copper in iron assimilation in a photosynthetic species. Nevertheless, growth of C. reinhardtii under copper- and iron-limiting conditions showed that, unlike the situation in yeast and mammals, where copper deficiency results in a secondary iron deficiency, copper-deficient Chlamydomonas cells do not exhibit symptoms of iron deficiency. We propose the existence of a copper-independent iron assimilation pathway in this organism.

A legacy of assimilation : abuse in Canadian native residential schools

Unlike the position in Australia, Canada has appropriately responded to the revelations of forced removal of indigenous children by apologising to those persons who suffered through the Native Residential Schools - Canada has also sought to facilitate settlements with many of these persons with validated claims.

Selection, exclusion and assimilation: the project lambert of 1931 on the reform of French immigration policy

The unemployment crisis of 1926-7 focused attention onto the question of immigration. Historians of this period have generally focused on the crisis of public policy and popular antipathies towards foreigners; more recently historians have become attuned to voices of racism. Less attention has been paid to attempts to redress the policy weaknesses through a new legislative regime on immigration. This paper reviews one such proposal, made by Charles Lambert, a deputy from the Rhone, in 1931. Instrumental in a revision of the naturalization law in 1927 to encourage the assimilation of foreigners through the acquisition of French citizenship, Lambert proposed a comprehensive statute on immigration to select “desirable” foreigners and exclude the “undesirables” to promote the assimilation of the “better” elements. The paper argues that his rationale betrays a profound fear of mounting French weakness in the face of economic and demographic decline, and grave anxieties for the future health of the French nation.

The stolen generations- Canada and Australia. The legacy of assimilation

Comparison of issues regarding the policy of Australian and Canadian governments of removing aboriginal children from their families and placing them in institutions - some Canadian claimantThis article provides a comparative overview of issues pertaining to the stolen generation in Canada and Australia. It includes a historical overview of the removal and detaining of aboriginal children in Canada and Australia. As a consequence of the revelations of this past practice, litigation has been undertaken by members of the stolen generations in both Canada and Australia. The article includes a summary of the key cases in Canada and Australia. Unlike in Australia, some Canadian aboriginal claimants have successfully brought actions for compensation against the federal Canadian government for the damages stemming from their experiences in the aboriginal residential schools. In the course of this discussion, the various causes of actions relied upon by the plaintiffs are examined While the plaintiffs in these leading Canadian cases were ultimately successful under at least one of their heads of claim, the approaches in these cases in regard to the Crown's liability for breaching fiduciary duties, the duty of care, and non-delegable duties is inconsistent. Thus even in regard to the Canadian jurisprudence key legal issues pertaining to the Crown's liability for the aboriginal residential school experience continues to be unresolved.

Retaining the frisson of the 'other' : imperialism, assimilation, integration and multiculturalism in Australian schools

In Australia, the 1960s saw a broadening of music offerings from other cultures in school materials from the Australian Broadcasting Commission (ABC). This is a useful indicator for changing perceptions. Since then, increasingly 'authentic' materials have become available but how far have we really come? Blacking (How musical is man? University of Washington Press, Seattle, 1973) identified the difficulty of acquiring and understanding, skill and authenticity in the music of another culture. He stressed that musical acquisition should occur in a cultural context. Removing music from one culture and presenting it in the symbolic gestures of another may strip its meaning. This is particularly true for musics from cultures removed from the Western paradigm. The further we move from our cultural norm, the harder it is to produce authentic experiences for students. By considering the African music resources offered to schools by the ABC, we can explore the attempts we have made to move from colonialism to multiculturalism.

Dietary assimilation and the digestive strategy of the omnivorous anomuran land crab Birgus latro (Coenobitidae).

On Christmas Island, Indian Ocean, the diet of robber crabs, Birgus latro (Linnaeus) was generally high in fat, storage polysaccharides or protein and largely comprised fruits, seeds, nuts and animal material. The plant items also contained significant amounts of hemicellulose and cellulose. In laboratory feeding trials, crabs had similar intakes of dry matter when fed artificial diets high in either fat or storage polysaccharide, but intake was lower on a high protein diet. Assimilation coefficients of dry matter (69–74%), carbon (72–81%), nitrogen (76–100%), lipid (71–96%) and storage polysaccharide (89–99%) were high on all three diets. B. latro also assimilated significant amounts of the chitin ingested in the high protein diet ( 93%) and hemicellulose (49.6–65%) and cellulose (16–53%) from the high carbohydrate and high fat diets. This is consistent with the presence of chitinase, hemicellulase and cellulase enzymes in the digestive tract of B. latro. The mean retention time (27.2 h) for a dietary particle marker (⁵⁷Co-labelled microspheres) was longer than measured in leaf-eating land crabs. The feeding strategy of B. latro involves the selection of highly digestible and nutrient-rich plant and animal material and retention of the digesta for a period long enough to allow extensive exploitation of storage carbohydrates, lipids, protein and significant amounts of structural carbohydrates (hemicellulose, cellulose and chitin).

Other musics in the classroom: from assimilation to multiculturalism in Australian school music

This paper considers the notion of 'other musics' within the Australian school context. It presents a theoretical overview of such terms as 'imperialism', 'assimilation', 'integration' and 'multiculturalism' - all terms that we use to summarise our inclusion of 'other' in Australian culture. By providing an historical overview of its development within educational settings, the examples cited articulate the archaic: assimilation of 'the other' matters within a multicultural society. By considering examples of past and present practice we hope to illuminate our use of other musics in Australian schools.

Resisting assimilation : the mild aesthetics and wild perceptions of the migrant house

The physical adaptation, remaking and maintenance, or building of the house plays a significant role in immigrants’ sense of belonging to a community, especially in contexts of first generation elderly immigrants with minimal English language skills. Psychoanalytic theories propose that objects are integral to a subject’s identity, but that the path of effect between the subject and object is not causal or direct, rather it goes via the unconscious. This paper seeks to examine the relationship between immigrants and their houses through these theories adapting them to an analysis of the houses. It draws its data from field research of three elderly immigrant households. The iconography of the house has always been perceived as central to the analysis of dreams, here the thesis is that the house is the most significant object of the immigrant because it mediates the many worlds inherent to the migrant’s imaginary landscapes. The analysis will seek to understand this role of the house.

Secondly, while many houses in which migrants live can barely be differentiated in clear physical ways from the typology of houses built in Australia, the perception that they are different is a strong myth. At the least it has resulted in very little, if any, study of this vernacular of new Australian houses. It would be easy to argue that to build a house in Australia is the most important mode of assimilation because a way of life is intrinsically set by this suburban paradigm. But for the reason of this perception of difference I will explore an idea about ethnic aesthetics as a mode of resisting assimilation. In writing on taste in his seminal book, Distinction, the sociologist, Pierre Bourdieu, has argued that taste is a way of classifying people into classes, race, culture, but it is also a way for dominant and ruling classes to resist challenges from other parties, and maintain a particular hierarchy of society. In this case those other parties are ethnic communities in Australia whose tastes are not always the same as that of the dominant Anglo-Celtic community.

Problem assimilation and offender rehabilitation

Whilst the overall effectiveness of offender rehabilitation programs in reducing recidivism is now well established, there has been less discussion of the reasons why rehabilitation programs may be unsuccessful for some offenders. In this paper we suggest that the Assimilation model of change (Stiles et al., 1991) may have utility in explaining how offender rehabilitation programs bring about change, and argue that those offenders who have particularly low levels of problem awareness may be at increased risk of treatment failure. Methods of measuring problem awareness and treatment readiness are discussed along with possible methods of intervention, including the Pennebaker method.

Chemical composition and tissue energy density of the cuttlefish (Sepia apama) and its assimilation efficiency by Diomedea albatrosses.

The cuttlefish Sepia apama Gray (Mollusca: Cephalopoda) is a seasonally abundant food resource exploited annually by moulting albatrosses throughout winter and early spring in the coastal waters of New South Wales, Australia. To assess its nutritional value as albatross forage, we analysed S. apama for water, lipid protein, ash contents, energy density and amino acid composition. Because albatrosses consistently consume S. apama parts preferentially in the order of head, viscera and mantle, we analysed these sections separately, but did not identify any nutritional basis for this selective feeding behaviour. The gross energy value of S. apama bodies was 20.9 kJ/g dry mass, but their high water content (>83%; cf <70% for fish) results in a relatively low energy density of 3.53 kJ/g. This may contribute to a need to take large meals, which subsequently degrade flight performance. Protein content was typically >75% dry mass, whereas fat content was only about 1%. Albatrosses feed on many species of cephalopods and teleost fish, and we found the amino acid composition of S. apama to be comparable to a range of species within these taxa. We used S. apama exclusively in feeding trials to estimate the energy assimilation efficiency for Diomedea albatrosses. We estimated their nitrogen-corrected apparent energy assimilation efficiency for consuming this prey to be 81.82 ± 0.72% and nitrogen retention as 2.90 ± 0.11 g N kg^-1 d^-1. Although S. apama has a high water content and relatively low energy density, its protein composition is otherwise comparable to other albatross prey species. Consequently, the large size and seasonal abundance of this prey should ensure that albatrosses remain replete and adequately nourished on this forage while undergoing moult.

Post-war migrant built heritage in Melbourne : from assimilation to multiculturalism

If place identities are created by ascribing subjective meaning to sites and buildings it follows that diverse groups will consider place meaning differently. This poses a challenge for the selection and interpretation of heritage sites in plural societies where notions of architectural significance are likely to conflict. Basing heritage policy on the premise of a shared heritage is particularly challenging when the cultural traditions of the past underlie definitions of architectural significance in a more culturally diverse present. This paper presents an introduction to research exploring the inclusion of twentieth century migrant built heritage in Australia. Through selected examples of recently recognised heritage sites in Melbourne, the paper considers how migrant heritage is included and what this reveals about the cultural traditions underlying Australian heritage discourses. The inclusion of migrant places suggests that there is an initial shift in heritage discourses where notions of architectural significance have expanded to include the history of post-war migration. However, the examples raise questions about the nature of cultural inclusivity in heritage frameworks.

Individuals' absorptive capacity in enterprise system assimilation

The capability of an individual to absorb knowledge about enterprise resource planning (ERP) is a critical element in the development of an organisation’s absorptive capacity (ACAP) during assimilation phase of ERP. Prior research have tended to overlook the roles that individuals play in identify external and internal knowledge, assimilate and exploit ERP knowledge. By defining ACAP at the individual level, we seek to enrich our understanding of how individual learn ERP knowledge and how such efforts facilitate the ERP assimilation within organisations. We develop a theoretical model to investigate the assimilation of enterprise systems in the post-implementation stage. Specifically, this model explains how communication climate and top management participation moderates the impact of Individuals’ ACAP on the assimilation of ERP systems.

Linking BI competency and assimilation through absorptive capacity: a conceptual framework

Business intelligence (BI) can help support decision-making processes and so contribute to improved BI assimilation and organisational performance. However, a BI undertaking may be effective and profitable for some organisations but not others. How can these differing outcomes be explained for those firms that have adopted BI systems? Drawing on the literature pertaining to absorptive capacity theory, IT competency, and BI assimilation we develop a conceptual framework to investigate the relationships between BI competency, absorptive capacity, and BI assimilation. This research provides insights for BI stakeholders in understanding the mediating role of organisational absorptive capacity within a complex BI environment, enabling many organisations that have implemented BI to leverage the benefits from their costly investments. The conceptual framework provides a sound basis for further research to shed light on the effects of BI competency and organisational absorptive capacity on BI assimilation. Contributions to research and practice are discussed.