Photosynthesis of hydrogen and methane as key components for clean energy system

While researchers are trying to solve the world's energy woes, hydrogen is becoming the key component in sustainable energy systems. Hydrogen could be produced through photocatalytic water-splitting technology. It has also been found that hydrogen and methane could be produced through photocatalytic reduction of carbon dioxide with water. In this exploratory study, instead of coating catalysts on a substrate, pellet form of catalyst, which has better adsorption capacity, was used in the photo-reduction of carbon dioxide with water. In the experiment, some water was first absorbed into titanium dioxide pellets. Highly purified carbon dioxide gas was then discharged into a reactor containing these wet pellets, which were then illuminated continuously using UVC lamps. Gaseous samples accumulated in the reactor were extracted at different intervals to analyze the product yields. The results confirmed that methane and hydrogen were photosynthesized using pellet form of TiO₂ catalysts. Hydrogen was formed at a rate as high as 0.16 micromoles per hour (μmol h⁻¹). The maximum formation rate of CH₄ was achieved at 0.25 μmol h⁻¹ after 24 h of irradiation. CO was also detected.

Dealing constructively with negatively evaluated emotional situations: the key to understanding the different reactions of teachers with high and low levels of emotional intelligence

Recent work on the distinctive features of emotions appraised as either negative or positive has links to the investigation of differences in levels of emotional intelligence. In a study with experienced teachers as participants, it was found that emotional reactions to positive or negative situations was moderated by level of emotional intelligence. The reactions to positively charged emotional situations involving students and peers were similar for teachers with high and low levels of emotional intelligence, although the low level group showed somewhat lower likelihood of making an “emotionally intelligent” response compared to the high level group. A much sharper contrast in response likelihood was found for negatively charged emotional situations involving students and peers. Teachers with high levels of emotional intelligence responded quite differently to those with low levels of emotional intelligence. The results indicate the prospect of clarifying a neglected area of exploration of differences in the likely behaviour of teachers differing in levels of emotional intelligence.

Key stakeholders' expectations of educational outcomes from Australian critical care nursing courses: a Delphi study

Background
Educational preparation for critical care nursing in Australia varies considerably in terms of the level of qualification resulting in a lack of clarity for key stakeholders about student outcomes.

Objectives
The study aim was to identify and reach consensus regarding the desired learning outcomes from Australian post-registration critical care education programs as demonstrated through the graduate's knowledge, skills and attitudes.

Design
A Delphi technique was used to establish consensus between educators, managers, clinicians and students regarding learning outcomes expected of graduates with a Graduate Certificate, Graduate Diploma and Master level qualification in critical care nursing.

Participants
A total of 164 critical care nurses (66 clinicians, 48 educators, 32 managers and 18 students) participated and 99 questionnaires were returned in the first round (response rate 60%). Fifty-seven questionnaires were returned for Round 2 (response rate 58%).

Methods
Learning outcomes were obtained from the Australian College of Critical Care Nurses Competency Standards for Specialist Critical Care Nurses. Some statements included more than one characteristic, and these were split to create learning outcomes with one characteristic per item. A survey of Australian higher education providers of critical care education provided additional learning outcomes, for a total of 73 learning outcomes for the first Delphi round.

Results
Findings suggest that patient comfort, safety, professional responsibility and ethical conduct are deemed most important for all three levels of educational preparation. There was a lack of emphasis on clinical practice issues for all levels. Participants placed higher emphasis on learning outcomes related to complex decision-making, leadership, supervision, policy development and research for Graduate Diploma and Master level programs.

Conclusion
The findings have implications for curriculum development and the profession with regards to the level of educational preparation required of critical care nurses and suggest that further work is required before clear recommendations can be made for desired educational outcomes from critical care nursing programs in Australia.

Association of key foods and beverages with obesity in Australian schoolchildren

Objective: To examine the pattern of intake of key foods and beverages of children aged 4–12 years and the association with weight status.
Design and setting: A computer-assisted telephone interview was used to determine the intake of fruit, vegetables, packaged snacks, fast foods and sweetened drinks ‘yesterday’ and ‘usually’ as reported by parents/guardians of a representative sample of 2184 children from the Barwon South-Western region of Victoria, Australia.
Results: Children who consumed .2–3, .3–4 and .4 servings of fruit juice/drinks ‘yesterday’ were, respectively, 1.7 (95% confidence interval (CI) 1.2–2.2), 1.7 (95% CI 1.2–2.5) and 2.1 (95% CI 1.5–2.9) times more likely to be overweight/obese compared with those who had no servings of fruit juice/drink ‘yesterday’, adjusted for age, gender and socio-economic status (SES). Further, children who had $3 servings
of soft drink ‘yesterday’ were 2.2 (95% CI 1.3–3.9) times more likely to be
overweight/obese compared with those who had no servings of soft drink ‘yesterday’, adjusted for age, gender and SES. In addition, children who ‘usually’ drank fruit juice/drinks twice or more per day were 1.7 (95% CI 1.2–2.4) times more likely to be overweight/obese compared with those who drank these beverages once or less per week, adjusted for age, gender and SES. Although fast foods and packaged snacks were regularly eaten, there were no associations between weight status and
consumption of these foods.
Conclusions: Intake of sweetened beverages was associated with overweight and obesity in this population of Australian schoolchildren and should be a target for intervention programmes aimed at preventing unhealthy weight gain in children.

Ageing effects on knee and ankle joint angles at key events and phases of the gait cycle.

The objective of this research was to determine whether joint angles at critical gait events and during major energy generation/absorption phases of the gait cycle would reliably discriminate age-related degeneration during unobstructed walking. The gaits of 24 healthy adults (12 young and 12 elderly) were analysed using the PEAK Motus motion analysis system. The elderly participants showed significantly greater single (60.3% versus 62.3%, p < 0.01) and double ( p < 0.05) support times, reduced knee flexion (47.7° versus 43.0°, p < 0.05) and ankle plantarflexion (16.8° compared to 3.3°, p = 0.053) at toe off, reduced knee flexion during push-off and reduced ankle dorsiflexion (16.8° compared to 22.0°, p < 0.05) during the swing phase. The plantarflexing ankle joint motion during the stance to swing phase transition (A₂) for the young group (31.3°) was about twice ( p < 0.05) that of the elderly (16.9°). Reduced knee extension range of motion suggests that the elderly favoured a flexed-knee gait to assist in weight acceptance. Reduced dorsiflexion by the elderly in the swing phase implies greater risk of toe contact with obstacles. Overall, the results suggest that joint angle measures at critical events/phases in the gait cycle provide a useful indication of age-related degeneration in the control of lower limb trajectories during unobstructed walking.

Skeletal muscle htererogeneity in fasting-induced upregulation of genes encoding UCP2, UCP3, PPARĂ and key enzymes of lipid oxidation

The uncoupling protein homologs UCP2 and UCP3 have been proposed as candidate genes for the regulation of lipid metabolism. Within the context of this hypothesis, we have compared, from fed and fasted rats, changes in gene expression of skeletal muscle UCP2 and UCP3 with those of carnitine palmitoyltransferase I and medium-chain acyl-CoA dehydrogenase, two key enzymes regulating lipid flux across the mitochondrial #-oxidation pathway. In addition, changes in gene expression of peroxisome proliferator-activated receptor gamma, a nuclear transcription factor implicated in lipid metabolism, were also investigated. The results indicate that in response to fasting, the mRNA levels of UCP2, UCP3, carnitine palmitoyltransferase I and medium-chain acyl-CoA dehydrogenase are markedly increased, by three- to sevenfold, in the gastrocnemius and tibialis anterior (fast-twitch muscles, predominantly glycolytic or oxidative-glycolytic), but only mildly increased, by less than twofold, in the soleus (slow-twitch muscle, predominantly oxidative). Furthermore, such muscle-type dependency in fasting-induced transcriptional changes in UCP2, UCP3, carnitine palmitoyltransferase and medium-chain acyl-CoA dehydrogenase persists when the increase in circulating levels of free fatty acids during fasting is abolished by the anti-lipolytic agent nicotinic acid - with blunted responses only in the slow-twitch muscle contrasting with unabated increases in fast-twitch muscles. Independently of muscle type, however, the mRNA levels of peroxisome proliferator-activated receptor gamma are not altered during fasting. Taken together, these studies indicate a close association between fasting-induced changes in UCP2 and UCP3 gene expression with those of key regulators of lipid oxidation, and are hence consistent with the hypothesis that these UCP homologs may be involved in the regulation of lipid metabolism. Furthermore, they suggest that in response to fasting, neither the surge of free fatty acids in the circulation nor induction of the peroxisome proliferator-activated receptor gamma gene may be required for the marked upregulation of genes encoding the UCP homologs and key enzymes regulating lipid oxidation in fast-twitch muscles.

Modelling trust structures for public key infrastructures

The development of Public Key Infrastructures (PKIs) is highly desirable to support secure digital transactions and communications throughout existing networks. It is important to adopt a particular trust structure or PKI model at an early stage as this forms a basis for the PKI’s development. Many PKI models have been proposed but use only natural language descriptions. We apply a simple formal approach to describe the essential factors of a PKI model. Rule sets for some PKI models are given and can be used to distinguish and classify the different PKI models. Advantages for this approach with conglomerate PKIs, those that are built from multiple distinct PKI models, are discussed.

GST legislation plus 2002 : featuring key sectional commentary and cross-references

A unique annual legislation book that makes understanding, interpreting and applying the evolving GST legislation easier for all practitioners.

GST legislation plus 2003 : featuring key sectional commentary and cross-references

A unique annual legislation book that makes understanding, interpreting and applying the evolving GST legislation easier for all practitioners.

Breaking the cultural mould : the key to women`s career success

This white paper explores the role of organisational culture in either supporting or constraining the success of women in the workplace and investigates the benefits of gender diversity and what organisations can do to prevent ongoing gender bias.