Conformational changes in redox pairs of protein structures

Disulfides are conventionally viewed as structurally stabilizing elements in proteins but emerging evidence suggests two disulfide subproteomes exist. One group mediates the well known role of structural stabilization. A second redox-active group are best known for their catalytic functions but are increasingly being recognized for their roles in regulation of protein function. Redox-active disulfides are, by their very nature, more susceptible to reduction than structural disulfides; and conversely, the Cys pairs that form them are more susceptible to oxidation. In this study, we searched for potentially redox-active Cys Pairs by scanning the Protein Data Bank for structures of proteins in alternate redox states. The PDB contains over 1134 unique redox pairs of proteins, many of which exhibit conformational differences between alternate redox states. Several classes of structural changes were observed, proteins that exhibit: disulfide oxidation following expulsion of metals such as zinc; major reorganisation of the polypeptide backbone in association with disulfide redox-activity; order/disorder transitions; and changes in quaternary structure. Based on evidence gathered supporting disulfide redox activity, we propose disulfides present in alternate redox states are likely to have physiologically relevant redox activity.

Atom probe tomography investigation of heterogeneous short-range ordering in the 'komplex' phase state (K-state) of Fe-18Al (at.%)

We study an Fe-18Al (at.%) alloy after various thermal treatments at different times (24-336 h) and temperatures (250-1100 °C) to determine the nature of the so-called 'komplex' phase state (or "K-state"), which is common to other alloy systems having compositions at the boundaries of known order-disorder transitions and is characterised by heterogeneous short-range-ordering (SRO). This has been done by direct observation using atom probe tomography (APT), which reveals that nano-sized, ordered regions/particles do not exist. Also, by employing shell-based analysis of the three-dimensional atomic positions, we have determined chemically sensitive, generalised multicomponent short-range order (GM-SRO) parameters, which are compared with published pairwise SRO parameters derived from bulk, volume-averaged measurement techniques (e.g. X-ray and neutron scattering, Mössbauer spectroscopy) and combined ab-initio and Monte Carlo simulations. This analysis procedure has general relevance for other alloy systems where quantitative chemical-structure evaluation of local atomic environments is required to understand ordering and partial ordering phenomena that affect physical and mechanical properties.

Epidermal growth factor-induced epithelio-mesenchymal transition in human breast carcinoma cells

PMC42-LA cells display an epithelial phenotype: the cells congregate into pavement epithelial sheets in which E-cadherin and beta-catenin are localized at cell-cell borders. They abundantly express cytokeratins, although 5% to 10% of the cells also express the mesenchymal marker vimentin. Stimulation of PMC42-LA cells with epidermal growth factor (EGF) leads to epithelio-mesenchymal transition-like changes including up-regulation of vimentin and down-regulation of E-cadherin. Vimentin expression is seen in virtually all cells, and this increase is abrogated by treatment of cells with an EGF receptor antagonist. The expression of the mesenchyme-associated extracellular matrix molecules fibronectin and chondroitin sulfate proteoglycan also increase in the presence of EGF. PMC42-LA cells adhere rapidly to collagen I, collagen IV, and laminin-1 substrates and markedly more slowly to fibronectin and vitronectin. EGF increases the speed of cell adhesion to most of these extracellular matrix molecules without altering the order of adhesive preference. EGF also caused a time-dependent increase in the motility of PMC42-LA cells, commensurate with the degree of vimentin staining. The increase in motility was at least partly chemokinetic, because it was evident both with and without chemoattractive stimuli. Although E-cadherin staining at cell-cell junctions disappeared in response to EGF, beta-catenin persisted at the cell periphery. Further analysis revealed that N-cadherin was present at the cell-cell junctions of untreated cells and that expression was increased after EGF treatment. N- and E-cadherin are not usually coexpressed in human carcinoma cell lines but can be coexpressed in embryonic tissues, and this may signify an epithelial cell population prone to epithelio-mesenchymal-like responses.

Factors associated with functioning style and coping strategies of familes with a child with an autism spectrum disorder

A survey of parents/caregivers of a child with an autism spectrum disorder (ASD) was conducted to examine the relationship between ASD characteristics, family functioning and coping strategies. Having a child with ASD places considerable stress on the family. Primary caregivers of a child with ASD from a regional and rural area in Victoria, Australia (N = 53) were surveyed concerning their child with ASD, family functioning (adaptability and cohesion), marital satisfaction, self-esteem and coping strategies. Results suggest that these caregivers had healthy self-esteem, although they reported somewhat lower marital happiness, family cohesion and family adaptability than did norm groups. Coping strategies were not significant predictors of these outcome variables. Results highlight the need for support programmes to target family and relationship variables as well as ASD children and their behaviours, in order to sustain the family unit and improve quality of life for parents and caregivers as well as those children.

Where in the world is room N101? Engaging with first year education students' experiences of transition

National reports on students’ experiences in their first year of tertiary study suggest that many students, particularly those coming directly from  secondary schools, find the transition into university life particularly difficult. These reports suggest that while many students find the experience to be a challenging hurdle others feel disengaged and unconnected to academic life. Reports also note that many students enter university with the expectation that their university experience should 'fit into their lives' rather than vice-versa.

Additionally, research indicates that successful transitional experiences for undergraduate students are critical in promoting effective learning habits, positive attitudes and openness to new knowledge. Establishing positive practices in the early days of the undergraduate course can enable students to utilise these experiences and knowledge as a part of their life-long professional habits. However, in order for this to occur, connections must be made, and relationships built, between students and their new peer groups and with the wider academic community. Connections must also be made between students' prior experiences and their new knowledge.

In light of the findings of recent research and reports, Deakin University has instituted a First Year Initiative to assist students in their transitions. Alongside and complementary to this, the Faculty of Education has developed a new three year Education Studies Major program which began this year.

In this paper, we discuss the ways in which the first two units of this new educational program aim to address some of the issues that students face when making the transition into university life. We see the implementation of the first two units as a 'pilot study' and while at this stage, evaluation of these units is only beginning, here we will consider some of the pedagogical strategies, resources, organisational structures and 'grounded' experiences that are being trialled as means to help students make the connections and take the first successful steps in their journey to becoming professional educators. Ways in which these new approaches aim to build important relationships between students, with staff and, as well, help them connect their prior experiences with new knowledge, will be considered in light of the literature on first year student transitions.

Responding to self-harm in borderline personality disorder : from clinician frustration to therapeutic enquiry

Pessimistic attitudes and reactive behavioural management strategies act as a major barrier to effective service provision for patients with borderline personality disorder. This paper reviews research on countertransference reactions (negative professional attitudes) towards these patients and the professional response to the common presentation of self harm in this particular client group. The psychotherapeutic treatment of patients with borderline personality disorder is complex and both professionally and personally demanding. A clinical framework is proposed that enables clinicians to develop a more nuanced and empathic understanding of self harm within the context of personality disorder in order to facilitate enhanced therapeutic engagement with these challenging patients. A clinical case study illustrates the use of this framework and the potential for enhanced therapeutic management in conjunction with the recognition and reduction of clinician indifference and rejection, thus improving patient outcomes. (editor abstract)Pessimistic attitudes and reactive behavioural management strategies act as a major barrier to effective service provision for patients with borderline personality disorder. This paper reviews research on countertransference reactions (negative professional attitudes) towards these patients and the professional response to the common presentation of self harm in this particular client group. The psychotherapeutic treatment of patients with borderline personality disorder is complex and both professionally and personally demanding. A clinical framework is proposed that enables clinicians to develop a more nuanced and empathic understanding of self harm within the context of personality disorder in order to facilitate enhanced therapeutic engagement with these challenging patients. A clinical case study illustrates the use of this framework and the potential for enhanced therapeutic management in conjunction with the recognition and reduction of clinician indifference and rejection, thus improving patient outcomes.

Considerations for performing arts organisations in a climate of transition to the open market context in Vietnam

The emergence of a global economy and culture has created a worldwide climate of change since the 1980s. These changes impact on the growth of a national economy and change the significance of sectors in society, for example the service sector, which increasingly accounts for an important part of the economy (Burbules & Torres, 2000). The arts have also been profoundly influenced by social changes, and technological development. While these changes pose new challenges for the arts, most of which struggle for financial viability in an era of globalisation, privatisation and reduced public funding, the developments also open new opportunities for arts companies/artists but require them to possess the capability to identify and adapt to change. This process underlines the necessary new capacities of arts management, arts marketing, arts leaders and artists.

Doi moi - Vietnamese economic reforms in 1986 - provided impetus for change in every sector, resulting in growth of the service sector in Vietnam (UNDP, 2002). Arts organisations in Vietnam found themselves operating in a more competitive environment, forcing them to adjust to this new economic structure. Improved Vietnamese living standards helped to create more demands for a diverse entertainment industry and allowed both the government and individuals to spend more on the arts. A new cultural policy - socialisation (somewhat equivalent to privatisation in Western countries) was implemented in the arts and cultural sector, producing for performing arts organisations (PAOs) as well as a broader cultural milieu in Vietnam, challenges of being self-sustaining but also more autonomy and greater funding diversity. Simultaneously, this led to upgraded artistic standards, improved infrastructure and higher musicians’ salaries; the latter having only experienced slow improvement during the subsidised era.

This paper investigates how social changes affected organisational operations of selected PAOs in Vietnam and Australia. The analysis of how PAOs in each country adjusted to rapid changes will provide experience for learning from each other, particularly for the Vietnamese case. These analyses provide points of discussion, comparison and implications for development of arts management training in Vietnam. Case studies, personal interviews with key participants and policy actors have been used to discern which direction performing arts management should take in order to correspond with Vietnam’s present and future economic situation and its political position in the world.

'Fencing them in' : the A-league, policing and the dilemma of public order

The establishment of an elite national Australian soccer league has been accompanied by an unprecedented growth in popularity for the world game in several Australian cities. Such growth presents numerous challenges for public order maintenance, particularly in light of the widespread concern over the relationship between soccer, disasters in major closed venues and violence. After outlining the emerging issues, and the extant Australian research into the phenomena of policing and sports crowd disorder, this study offers a knowledge based approach to foster informed, reflective and collaborative policing in elite and sub-elite soccer venues. Rather than advocating a fundamental shift in the current public order policing paradigm, we suggest drawing on elements of best practice that are currently adopted in other Australian sporting and public order settings and appropriate overseas experience to facilitate a better understanding of the dynamics of Australian soccer fandom. The result should be the promotion of safer yet exciting events at which interactive crowd management based on harm minimization principles are key features.

Origins of inflated responsibility in obsessive compulsive disorder

The pivotal role of inflated responsibility beliefs in the maintenance and treatment of obsessive-compulsive disorder (OCD) has been clearly demonstrated (Rachman, 1993; Salkovskis, 1998; Shafran, 1997; van Oppen & Arntz, 1994). Yet little is known about the origins of these beliefs, their contribution to a sense of inflated responsibility or the symptoms of OCD, or the contribution of personality to inflated responsibility and to OCD, The aims of this thesis were to investigate a model of the inter-relationships among the personality dimensions of neuroticism and psychoticism, inflated responsibility and OCD, and the origins of inflated responsibility to inflated responsibility and to OCD. In order to achieve these aims, a scale was developed to assess the origins of inflated responsibility based upon the five pathways proposed by Salkovskis, Shafran, Rachman, and Freeston (1999) and the additional domains of guilt, vigilance and thought-action fusion (Shafran, Thordarson, & Rachman, 1996; Shafran, Watkins & Charman, 1996; Tallis, 1994). Eighty-four participants with OCD (age M = 43.36) and 74 control participants (age M =37.14) volunteered to participate in the two studies of this thesis. The aim of Study 1 was to develop and validate a measure of the Origins of Inflated Responsibility (OIR). The results of the first study yielded a 25-ttem scale, the Origins of Inflated Responsibility Questionnaire (OIRQ) with five independent factors: responsibility, strictness, protection from responsibility, critical incidents, and peer blame which demonstrated both internal reliability and temporal stability over a 2-week period. In Study 2, participants also completed the Responsibility Attitudes Scale (Salkovskis, Wroe, Gledhill, Morrison, Forrester, Richards, ct al. (2000) (a measure of inflated responsibility), the Padua Inventory (Sanavio, 1988) (to measure of the symptoms of OCD)y and the Eysenck Personality Inventory-Revised (Eysenck & Eysenck, 1991). Multivariatc Analysis of Variance revealed that the OCD group scored higher on all variables than the control group except for strictness where the groups were not different, and psychoticism where the OCD group scored lower. A series of Multiple Regression analyses revealed that both group and the OIR contributed to inflated responsibility (R2 = .56). When all variables, OIR, inflated responsibility and neuroticism were entered as predictors of OCD, 60% of the variance in OCD was explained however, 49% of the variance was shared by the independent variables suggesting the presence of some underlying construct. Structural Equation Modelling, where all the constructs in the model were examined simultaneously, revealed that neuroticism contributed to the OIR, inflated responsibility and OCD. The OIR were also significant predictors of inflated responsibility and indirectly through inflated responsibility predictive of OCD. The OIR also directly predicted OCD and when the total effects are considered, their contribution was greater than the total effect for inflated responsibility alone. The results of these studies provide good support for the origins of inflated responsibility proposed by Salkovskis et al. (1999), as measured by the OIRQ developed for use in the current thesis. The results also support the contribution of inflated responsibility and neuroticism, as well as the OIR, to OCD, The large amount of variance shared by the OIR, inflated responsibility and neuroticism suggest that there might be some underlying construct, perhaps of a biopsychosocial nature, that requires further investigation for its role in the onset and maintenance of OCD. The clinical relevance of these findings is discussed in terms of early prevention strategies and interventions.

Glass transition and free volume behaviour of poly(acrylonitrile)/LiCF3SO3 polymer-in-salt electrolytes compared to poly(ether urethane)/LiClO4 solid polymer electrolytes

Measurements of the glass transition temperature (T_g) and free volume behaviour of poly(acrylonitrile) (PAN) and PAN/lithium triflate (LiTf), with varying salt composition from 10 to 66 wt% LiTf, were made by positron annihilation lifetime spectroscopy (PALS). Addition of salt from 10 to 45 wt% LiTf resulted in an increase in the mean free volume cavity size at room temperature (r.t.) as measured by the orthoPositronium (oPs) pickoff lifetime, τ₃, with little change in relative concentration of free volume sites as measured by oPs pickoff intensity, I₃. The region from 45 to 66 wt% salt displayed no variation in relative free volume cavity size and concentration. This salt concentration range (45 wt%<[LiTf]<66 wt%) corresponds to a region of high ionic conductivity of order 10⁻⁵ to 10⁻⁶ S cm⁻¹ at T_g as measured by PALS. A percolation phenomenon is postulated to describe conduction in this composition region. Salt addition was shown to lower the T_g as measured by PALS; T_g was 115°C for PAN and 85°C for PAN/66 wt% LiTf. The T_g and free volume behaviour of this polymer-in-salt electrolyte (PISE) was compared to a poly(ether urethane)/LiClO₄ where the polymer is the major component, i.e. traditional solid polymer electrolyte (SPE). In contrast to the PISE, the T_g of the SPE was shown to increase with increasing salt concentration from 5.3 to 15.9 wt%. The relative free volume cavity size and concentration at r.t. were shown to decrease with increasing salt concentration. Ionic conductivity in this SPE was of order 10⁻⁵ S cm⁻¹ at r.t., which is over 60°C above T_g, 10⁻⁸ S cm⁻¹ at 25°C above T_g, and conductivity was not measurable at T_g.

An investigation into transition metal ion binding properties of silk fibers and particles using radioisotopes

Silk is a structural protein fiber that is stable over a wide pH range making it attractive for use in medical and environmental applications. Variation in amino acid composition has the potential for selective binding for ions under varying conditions. Here we report on the metal ion separation potential of Mulberry and Eri silk fibers and powders over a range of pH. Highly sensitive radiotracer probes, ⁶⁴Cu²⁺, ¹⁰⁹Cd²⁺, and ⁵⁷Co²⁺ were used to study the absorption of their respective stable metal ions Cu²⁺, Cd²⁺, and Co²⁺ into and from the silk sorbents. The total amount of each metal ion absorbed and time taken to reach equilibrium occurred in the following order: Cu²⁺ > Cd²⁺ > Co ²⁺. In all cases the silk powders absorbed metal ions faster than their respective silk fibers. Intensive degumming of the fibers and powders significantly reduced the time to absorb respective metal ions and the time to reach equilibrium was reduced from hours to 5-15 min at pH 8. Once bound, 45-100% of the metal ions were released from the sorbents after exposure to pH 3 buffer for 30 min. The transition metal ion loading capacity for the silk sorbents was considerably higher than that found for commercial ion exchange resins (AG MP-50 and AG 50W-X2) under similar conditions. Interestingly, total Cu²⁺ bound was found to be higher than theoretically predicted values based on known specific Cu²⁺ binding sites (AHGGYSGY), suggesting that additional (new) sites for transition metal ion binding sites are present in silk fibers.

Middle powers and the building of regional order : Australia and South Korea compared

This article compares how two alliance partners of the United States — Australia and the Republic of Korea — are adjusting to the transition from the Cold War order in the Asia-Pacific to a new, as yet undefined regional order. As states occupying positions of privilege in the U.S.-led Cold War order, these two middle powers have engaged with the ASEAN grouping, the putative driver of the coming order, while maintaining traditional alliance commitments to the United States. This article focuses on proposals for the building of formal institutions and also other policies which can influence the formation of regional order, such as economic integration through the pursuit of free trade agreements. In examining an Asian and a non-Asian state, the article also considers how identity shapes attitudes to region and order.

Psychological needs of adolescents in the early phase of bipolar disorder : implications for early intervention

Aim: This paper will describe the rationale for, and importance of, psychological interventions for young people early in the course of bipolar disorder.
Methods: Emerging literature in this field will be discussed in addition to describing specific clinical challenges and opportunities with this population.
Results: In order to be more developmentally appropriate for young people with bipolar disorder, eight aspects of clinical work which may require modification were identified.
Conclusions: The evidence base for the effectiveness of psychological interventions for people diagnosed with bipolar disorder is growing. However, some aspects relating to working with adults with bipolar disorder require modification to be effective in working with young people early in the course of the disorder.