Considerations for determining the time course of post-activation potentiation

We sought to determine the efficacy of using a continuous time course trial to assess the temporal profile of post-activation potentiation and to determine the time course of potentiation of discrete jump squat kinetic and kinematic variables. Eight physically trained men performed jump squats before and 4, 8, and 12 min after a 5-repetition maximum back squat. Time intervals were assessed in 3 discontinuous trials (each time interval assessed in a separate trial) and in 1 continuous trial (all time intervals assessed in a single trial). Percentage differences between continuous and discontinuous trials at each time interval were mostly insubstantial. Discrete variables displayed a diverse time course (effect size: trivial to large); time to maximal values ranged between 5.00 ± 2.53 min (concentric peak force) and 9.50 ± 2.98 min (eccentric mean force). Eccentric variables (8.58 ± 3.56 min) took longer to peak than concentric variables (6.64 ± 2.93 min) (effect size: small). Individual subjects attained maximal values for kinetic and kinematic variables at different time intervals, yet the 4-min interval typically displayed the greatest magnitude and frequency of potentiation. We conclude that a continuous time course trial does not substantially influence performance of subsequent jumps and is appropriate for determining the temporal profile of potentiation, which is influenced by discrete jump squat kinetic and kinematic variables and individual differences.

The influence of time since fire and distance from fire boundary on the distribution and abundance of arboreal marsupials in Eucalyptus regnans-dominated forest in the Central Highlands of Victoria

The impact of time since fire after two consecutive wildfires 44 years apart (1939 and 1983) within the same area, and the distance from the fire boundary «100 m or 500-2000 m), were investigated in relation to the distribution and abundance of arboreal marsupials in 1994. Arboreal marsupials were censused by stagwatching and spotlighting in two relatively young age classes of mountain ash (Eucalyptus regnans) dominated forest in the Central Highlands of Victoria. Five species of arboreal marsupial were detected, but only three were detected in sufficient numbers to determine habitat preferences. Petauroides volans (greater glider) was statistically more abundant in 1939 regrowth forests, while Trichosurus caninus (mountain brushtail possum) showed no significant preference for either age class of forest. All but one record of Gymnobelideus leadbeateri (Leadbeater's possum) came from young forest, though the effect of age-class was not statistically significant. Distance from fire boundary explained little or no variation in mammal distribution or abundance. While the actual number of hollow-bearing trees was similar in both age classes of forest, the long-term lifespan of hollow-bearing trees in more recently burnt forest is predicted to be lower than in unburnt or not recently burnt forest. Post-fire salvage logging following the 1983 wildfires appears to have reduced the number of hollow-bearing trees at sites burnt in 1983.

Disinterested truth: legitimation of the doctrine of tenure post-Mabo

This article argues that it is time for the complete abolition of feudal tenure in Australian land law and its replacement with an allodial model better able to promote proprietary independence, equality and cultural neutrality. The article considers the questionable constitutional legitimacy of adopting strict feudal tenets in a territory already inhabited by indigenous occupants. It goes on to examine the various legitimation devices that the courts have utilised to sustain the feudal construct and the effect that Mabo has had upon feudal orthodoxy. In particular, the article outlines why post-Mabo tenure is incapable of embracing a pluralist land system; it is suggested that the Eurocentric character of feudal tenure and the structural impediments associated with the acceptance of a non-Crown title prevent it from ever being able to effectively integrate native title into the structure of property law. In light of this, the article argues that post-Mabo tenure lacks both legal and social legitimacy and the 'disinterested' perpetuation of this system must be brought to an end. The article argues that the time has well and truly come to replace feudal tenure with an allodial model based broadly on the system that has developed in the United States but with particularised adaptations. The removal of the Crown and its associated cultural assumptions from the land framework would, it is argued, allow land interests to develop according to their individual cultural origins. This would create a more responsive and balanced system better equipped to embrace the developments of contemporary common law jurisprudence.

Post-migration food habits of sub-Saharan migrants in Victoria: a cross-sectional study

Objective: (i) To describe sub-Saharan African (SSA) post-migration food habits and eating patterns; and (ii) to examine how the food habits of SSA households in Victoria reflect post-migration acculturation.
Design: A cross-sectional survey using a snowball sampling technique. Data on food habits and eating patterns were obtained using semi-structured, face-to-face interviews from November 2001 to April 2002.
Subjects: A total of 139 households of demographically diverse recent migrants from across sub-Saharan Africa.
Setting: Melbourne metropolitan and Melbourne fringes.
Analysis: Data were summarised using descriptive statistics.
Results: SSA migrants and refugees indicated dietary acculturation characterised by three processes: substitution, supplementation and modification of recipes. They experienced difficulty locating their traditional foods, in particular, African vegetables (34.2%), unprocessed maize meal (29.1%), camel milk (23.1%) and maize grain (13.7%). The new foods adopted since arrival were pizza, breakfast cereals and fast foods, but also included new fruits and vegetables. Takeaway food such as Pizza Hut or McDonalds featured prominently in the SSA post-migration diet. Reasons for eating out were favourite food (48.3%), routine family outing (38.3%), special occasion (33.3%) and no time to cook (25%). A significant change in meal pattern was the inclusion of breakfast, although 21% reported skipping breakfast.
Conclusion: Many of the observed dietary changes were not consistent with good health and may predispose this population to rapid weight gain and chronic disease. Rapid modernisation and the Anglo-Australian culture interact in a complex way with traditional eating and socialisation practices of SSA migrants. Understanding these forces can allow effective health promotion and community development strategies to be developed for the future health of SSA migrants and their communities.

Dietary intake in post-menopausal women

Si has been suggested as an essential element, and may be important in optimal bone, skin and cardiovascular health. However, there are few estimates of dietary Si intakes in man, especially in a UK population. Following the development of a UK food composition database for Si, the aim of the present study was to investigate dietary intakes of Si amongst healthy women aged over 60 years and to identify important food sources of Si in their diet. Healthy, post-menopausal female subjects (>60 years of age; n 209) were recruited from the general population around Dundee, Scotland as part of an unrelated randomised controlled intervention study where dietary intake was assessed using a self-administered, semi-quantitative food-frequency questionnaire at five time-points over a 2-year period. Food composition data on the Si content of UK foods was used to determine the Si content of food items on the food-frequency questionnaire. Mean Si intake was 18·6 (sd 4·6) mg and did not vary significantly across the 2 years of investigation. Cereals provided the greatest amount of Si in the diet (about 30%), followed by fruit, beverages (hot, cold and alcoholic beverages combined) and vegetables; together these foods provided over 75% about Si intake. Si intakes in the UK appear consistent with those reported previously for elderly women in Western populations, but lower than those reported for younger women or for men.

To post or not to post : undergraduate student perceptions about participating in online discussions

Computer mediated conferencing (CMC) is now a common feature of blended learning environments where students learn in both face to face and online settings. While many teachers recognize the value of online discussions for learning, students appear to have different perspectives. Consequently, their participation in online discussions is often sporadic and not genuinely interactive. This paper examines these issues and provides student perspectives about participation in online discussions which arose from a case study in a conceptually difficult subject. Systems data indicated low numbers of posted messages. Student interviews provide some insights into this lack of participation, and identify the influence of the curriculum design, especially the nature of the learning activity, and its connection to other aspects of the course, for example, assessment and the regular class sessions. Other influential factors include the student’s ideas about learning, managing demands on their time and their acceptance of CMC. The paper also provides recommendations for improving participation in online discussions.

Does organizational structure matter? The behaviour of Australian Building Societies pre-and post-demutualization

Financial performance measures, provided by accounting-based financial ratios, of the major mutual building societies in Australia are used to explore their behaviour pre-and post-demutualization in the 1980s and 1990s. The theoretical and empirical literature has suggested that mutual deposit-taking institutions would have lower profitability and higher operating expenses than their publicly listed counterparts. Common accounting ratios are observed over time to investigate if ownership change in a mutual deposit-taking organization accounted for any discernable differences in profitability and cost efficiency of the firms after conversion.

The dynamics of business ethics: a function of time and culture-cases and models

Examines the construct of ethics in general and of business ethics in particular. Provides a conceptual discussion of the dynamics of ethics in society and the dynamics of business ethics in the marketplace. Ethics and business ethics constructs are dependent upon two principal parameters – time and culture. Eventually, ethics and business ethics are about what is perceived as acceptable or unacceptable at a specific time and in a specific cultural setting. What was ethical yesterday may not be ethical today, and what is ethical today may not be ethical tomorrow. Furthermore, both the company’s view and the views of others may determine what is acceptable or unacceptable in business ethics. This is a social construction that may differ between the parties involved in a specific context. The discussion is supported by two brief and different cases from the automobile industry. This research contributes a set of generic models that examine business ethics dynamics.

The influence of procedural and interactional justice, and disconfirmation on customers post recovery satisfaction evaluations

This study examines the influence of distributive and interactional justice and disconfirmation on customers’ postrecovery satisfaction evaluations, and in so doing, combines, for the first time, two existing instruments to operationalise the interactional justice construct. Using Structural Equation Modelling, the findings suggest that while both disconfirmation and justice are important predictors of satisfaction, distributive justice has the greatest influence. The research presented here reports on a section of a larger experiment-based study examining how customers’ postrecovery satisfaction evaluations are influenced by the way in which the organisation responds to the failure.

Psychosocial issues facilitating recovery post-CABG surgery

Background
The acute illness phase following coronary artery bypass graft (CABG) surgery is a difficult time for patients as they try to adjust to the physical and emotional changes brought about by surgery.
Aims
To conduct an indepth examination of psychosocial issues experienced by patients post-CABG surgery and how patients manage these psychosocial issues during their recovery.
Methods
A qualitative research approach, naturalistic inquiry, guided the study. Thirty patients were interviewed 4–5 weeks following discharge from hospital after CABG surgery and at 12 months after the initial interview.
Results
esults found that adjusting to life after surgery was difficult, and patients experienced some form of physical pain or change. An unexpected finding was the extent to which many of the patients were attuned to their post-operative physical adjustments. Patients spoke of mental and emotional changes, and coming to terms with lifestyle adjustments.
Conclusion
Study findings suggest the need for a re-examination of hospital discharge preparation and further provision and monitoring of home support services.

Cost-effectiveness of a post-splenectomy registry for prevention of sepsis in the asplenic

Background: Overwhelming, sometimes fatal infections represent a lifelong risk after surgical removal of the spleen, or in patients who develop hyposplenism as a consequence of illnesses. This risk may be reduced by all or a combination of vaccination, antibiotic prophylaxis and education. We aimed to determine if a registry approach to delivering these interventions would be cost effective using our own experience and published data.
Method: The decision model compared a cohort of 1,000 people covered by a registry to a cohort of 1,000 people with no registry. The impact of the registry was assessed in terms of achieved rates of vaccination, chemoprophylaxis and education, consequent outcomes of overwhelming post-splenectomy infection (OPSI) and mortality (years of life lived). The cost-effectiveness of the registry compared with no registry was estimated in terms of additional cost per case of OPSI avoided and as additional cost per life year gained.
Results: In the first two years, the additional cost of the registry was $152,611 per case of OPSI avoided or $205,931 per life year gained. After this initial registration period the costeffectiveness improves over time, such that over the cohort lifetime a post-splenectomy register is associated with an additional cost of $105,159 per case of OPSI avoided or $16,113 per life year gained.
Conclusion: A registry-based approach is likely to prove cost effective in terms of mortality and rates of OPSI avoided.

On-track to what? Foucauldian analysis of Victorian post-compulsory education policy

Current ideas of adolescent development portray a slow steady movement toward adulthood. These notions developed hand in hand with social practices that evolved in the latter half of the 19th century and contemporaneously with modernisation. During this period conceptions of adolescence included longer stays in school, organised leisure activities, juvenile justice policies and the protection of youth from child labour. Lesko (2001) works from a position that the modern age is defined by time, an understanding that events and change are meaningful in their occurrence in and through time. She examines adolescence as partaking of panoptical time which is condensed and commodified; a time framework that compels us - scholars, educators, parents, and teenagers - to attend to progress, precocity, arrest, or decline" (2001 p.41). Panoptical time can be used to explore how ideas of what is 'normal' development can be used to privilege particular ways of being an adolescent, to monitor who is deemed to be 'at risk' of not conforming to that model and to govern their behaviour. A Foucauldian analysis suggests the formation of 'at risk' identities reflects historically specific discourses. An understanding of how these and other discursive constructions are formed opens the way for resistance. This presentation explores the recent implementation of On-Track and On-Track Connect within Victorian government policy and explores the experience of a Local Learning and Employment Network in implementing the policy.

Hot deformation and recrystallization of austenitic stainless steel: Part 11. post-deformation recrystallization

The postdeformation recrystallization behavior of a hot-deformed austenitic stainless steel was investigated based on the first part of this study, in which the microstructure development during hot deformation and, in particular, the evolution of dynamic recrystallization (DRX), was studied. The effect of different parameters such as strain, strain rate, and temperature were examined. The dependency of the time for 50 pct softening, t 50, changed from “strain dependent” to “strain independent” at a transition strain (ε*) that was in the steady-state area of the hot deformation flow curve. The fully recrystallized microstructure showed a similar transition in strain sensitivity. However, this occurred at stains greater than ε*. A mathematical model was developed to predict the transition strain under different deformation conditions. Microstructural measurements show that the transition strain corresponds to approximately 50 pct DRX in the deformed structure at the point of unloading.

Cage colour and post-harvest K+ concentration affect skin colour of Australian snapper Pagrus auratus (Bloch & Schneider, 1801)

In an attempt to improve post-harvest skin colour in cultured Australian snapper Pagrus auratus, a two-factor experiment was carried out to investigate the effects of a short-term change in cage colour before harvest, followed by immersion in K⁺-enriched solutions of different concentrations. Snapper supplemented with 39 mg unesterified astaxanthin kg⁻¹ for 50 days were transferred to black (for 1 day) or white cages (for 1 or 7 days) before euthanasia by immersing fish in seawater ice slurries supplemented with 0, 150, 300, 450 or 600 mmol L⁻¹ K⁺ for 1 h. Each treatment was replicated with five snapper (mean weight=838 g) held individually within 0.2 m³ cages. L*, a* and b* skin colour values of all fish were measured after removal from K⁺ solutions at 0, 3, 6, 12, 24 and 48 h. After immersion in K⁺ solutions, fish were stored on ice. Both cage colour and K⁺ concentration significantly affected post-harvest skin colour (P<0.05), and there was no interaction between these factors at any of the measurement times (P>0.05). Conditioning dark-coloured snapper in white surroundings for 1 day was sufficient to significantly improve skin lightness (L*) after death. Although there was no difference between skin lightness values for fish held for either 1 or 7 days in white cages at measurement times up to 12 h, fish held in white cages for 7 days had significantly higher L* values (i.e. they were lighter) after 24 and 48 h of storage on ice than those held only in white cages for 1 day. K⁺ treatment also affected (improved) skin lightness post harvest although not until 24 and 48 h after removal of fish from solutions. Before this time, K⁺ treatment had no effect on skin lightness. Snapper killed by seawater ice slurry darkened (lower L*) markedly during the first 3 h of storage in contrast with all K⁺ treatments that prevented darkening. After 24 and 48 h of storage on ice, fish exposed to 450 and 600 mmol L⁻¹ K⁺ were significantly lighter than fish from seawater ice slurries. In addition, skin redness (a*) and yellowness (b*) were strongly dependent on K⁺ concentration. The initial decline in response to K⁺ was overcome by a return of a* and b* values with time, most likely instigated by a redispersal of erythrosomes in skin erythrophores. Fish killed with 0 mmol L⁻¹ K⁺ maintained the highest a* and b* values after death, but were associated with darker (lower L*) skin colouration. It is concluded that a combination of conditioning snapper in white surroundings for 1 day before harvest, followed by immersion in seawater ice slurries supplemented with 300–450 mmol L⁻¹ K⁺ improves skin pigmentation after >24 h of storage on ice.

Estimating post-release survival and the influential factors for recreationally caught Black Bream (Acanthopagrus butcheri) in the Glenelg River, south eastern Australia

Black bream (Acanthopagrus butcheri) is the main target species amongst the estuarine recreational fisheries of Victoria, Australia. The A. butcheri fishery is managed through legal-minimum length and daily bag limits. The success of this management strategy requires that the survival rate for released fish is high. This study used the most common angling practices to estimate post-release survival and identify influential factors for undersized A. butcheri in Victoria. In total 1557 and 923 A. butcheri were caught and monitored for initial (≤1 h) and delayed (72 h) survival, respectively. Fish were caught across 3 years, with each year separated into cold and warm water periods with 8 fishing trial days in total. Only 1 of the 266 controls used to assess confinement effects died. Total survival was 95% (S.E. ± 0.8%) for shallow- and 74% (S.E. ± 3%) for deep-hooked fish and decreased as fish length increased. A post-mortem (PM) procedure was developed and showed that throat and gill injuries were the most frequent cause of deep-hooking death. It revealed that 97% of hooks left in fish remained there after 72 h and identified hooking location inaccuracies recorded at the time of capture. Total survival for deep-hooked fish was 20% higher when hooks were left in the fish. Deep-hooked fish were more likely to bleed when hooks were removed and total survival was lower for fish that bleed (58%) than fish that did not bleed (80%). Shallow-hooking rates decreased as fish length increased and were higher during warm water compared to cold water trials. The high shallow-hooking and survival rates observed suggest that A. butcheri survival in the fishery would be high, but deep-hooking has the potential to undermine the management strategy. Determining the shallow-hooking rate in the fishery would help clarify the impact of these findings at the fishery level.