Life and death : metabolic rate, membrane composition, and life span of animals

Maximum life span differences among animal species exceed life span variation achieved by experimental manipulation by orders of magnitude. The differences in the characteristic maximum life span of species was initially proposed to be due to variation in mass-specific rate of metabolism. This is called the rate-of-living theory of aging and lies at the base of the oxidative-stress theory of aging, currently the most generally accepted explanation of aging. However, the rate-of-living theory of aging while helpful is not completely adequate in explaining the maximum life span. Recently, it has been discovered that the fatty acid composition of cell membranes varies systematically between species, and this underlies the variation in their metabolic rate. When combined with the fact that 1) the products of lipid peroxidation are powerful reactive molecular species, and 2) that fatty acids differ dramatically in their susceptibility to peroxidation, membrane fatty acid composition provides a mechanistic explanation of the variation in maximum life span among animal species. When the connection between metabolic rate and life span was first proposed a century ago, it was not known that membrane composition varies between species. Many of the exceptions to the rate-of-living theory appear explicable when the particular membrane fatty acid composition is considered for each case. Here we review the links between metabolic rate and maximum life span of mammals and birds as well as the linking role of membrane fatty acid composition in determining the maximum life span. The more limited information for ectothermic animals and treatments that extend life span (e.g., caloric restriction) are also reviewed.

Biopsychosocial life-span perspective of menopause

Examines the role of biological, psychological and social factors within the individual menopausal experiences of women and the aging process. Sexual function, well-being, role, interpersonal relationships and body image were researched in a series of thre studies in a community sample of women aged 35 to 65 years.

Clinical characteristics and management of bipolar disorder in women across the life span

Though prevalent in both genders, specific consideration needs to be given when treating a woman suffering from bipolar disorder over her lifetime. Bipolar disorder is a serious and incapacitating illness affecting an estimated 5% of women. The first episode of illness in women is usually a depressive episode. Female gender has been associated with greater axis-one comorbidity, more depressive episodes, rapid cycling and mixed affective states. Special consideration is required for the treatment of bipolar disorder during reproductive events. More studies are required to better understand the course, outcome and gender-specific treatment strategies of this disorder.

A 'slow pace of life' in Australian old-endemic passerine birds is not accompanied by low basal metabolic rates

Life history theory suggests that species experiencing high extrinsic mortality rates allocate more resources toward reproduction relative to self-maintenance and reach maturity earlier ('fast pace of life') than those having greater life expectancy and reproducing at a lower rate ('slow pace of life'). Among birds, many studies have shown that tropical species have a slower pace of life than temperate-breeding species. The pace of life has been hypothesized to affect metabolism and, as predicted, tropical birds have lower basal metabolic rates (BMR) than temperate-breeding birds. However, many temperate-breeding Australian passerines belong to lineages that evolved in Australia and share 'slow' life-history traits that are typical of tropical birds. We obtained BMR from 30 of these 'old-endemics' and ten sympatric species of more recently arrived passerine lineages (derived from Afro-Asian origins or introduced by Europeans) with 'faster' life histories. The BMR of 'slow' temperate-breeding old-endemics was indistinguishable from that of new-arrivals and was not lower than the BMR of 'fast' temperate-breeding non-Australian passerines. Old-endemics had substantially smaller clutches and longer maximal life spans in the wild than new arrivals, but neither clutch size nor maximum life span was correlated with BMR. Our results suggest that low BMR in tropical birds is not functionally linked to their 'slow pace of life' and instead may be a consequence of differences in annual thermal conditions experienced by tropical versus temperate species.

Prescribing exercise for Osteoporosis

Osteoporosis is a major public health problem because of the morbidity and mortality associated with fracture. Minimizing the risk of fracture is the primary objective of osteoporosis management. The role of exercise in osteoporosis management is to increase and maintain peak bone density and reduce the rate of bone loss and the risk of falling. This article provides recommendations focusing on a life-span approach to minimizing the risk of fracture associated with osteoporosis. Osteoporosis prevention begins in childhood, when exercise can increase peak bone strength. In young adults, it can maintain peak bone mineral density. In elderly individuals, physical activity can slow bone loss and improve fitness and muscle strength, helping prevent falls and lower the risk of fracture. Exercise goals for individuals with osteoporosis should include reducing pain, increasing mobility, and improving muscle endurance, balance, and stability in order to improve the quality of life and reduce the risk of falling. Thus, exercise plays a significant part in reducing fractures in later life.

Yield, growth and mortality rate of the Thai river sprat, Clupeichthys aesarnensis, in Sirinthorn Reservoir, Thailand

The Thai river sprat, Clupeichthys aesarnensis Wongratana, is a clupeid with a short life span, and supports artisanal fisheries in a number of reservoirs in the Mekong Basin. The growth parameters, mortality rates and the status of the Thai river sprat in Sirinthorn Reservoir (28 800 ha), NE Thailand (15°N; 105°E), are presented. The fishery is based on lured lift-nets, operated 7–14 days in the new moon period, September to April each year. It was shown that the von Bertalanffy growth function (VBGF) model was L_t (mm) = 78.43[1 − exp{−0.211[t − (−0.7996)]}] and its growth conformed to an isometric pattern. Natural mortality rate (month−¹) was 0.13 month−¹. Total mortality rates ranged from 0.69 to 1.53 month−¹ depending on the weather and the fishing season. Recruitment was continuous throughout the year but peaked in June and July. The yield per recruit model indicated that the exploitation rate of this fishery is probably too high.

Location based power control for energy critical sensors in a disconnected network

This paper provides a location based power control strategy for disconnected sensory nodes deployed for long term service. Power conservation is of importance particularly when sensors communicate with a mobile robot used for data collection. The proposed algorithm uses estimations from a Robust Extended Kalman Filter (REKF) with RSSI measurements, in implementing a sigmoid function based power control algorithm which essentially approaches a desired power emission trajectory based on carrier-to-interference ratios(CIR) to ensure interferenceless reception. The more realistic modelling we use incorporates physical dynamics between the mobile robot and the sensors together with the wireless propagation parameters between the transmitter and receiver to formulate a sophisticated and effective power control strategy for the exclusive usage of energy critical disconnected nodes in a sensory network increasing their life span.

Extending studies of collaborative cognition by way of care giving situations

Care giving situations contain several features that offer opportunities for expanding the way that collaborative cognition is conceptualised and explored. These features are the presence of several possible contributors, more than one kind of change in participation, distinctions drawn among parts of a task, and differences in understanding based on interests. All represent departures from the traditional focus on dyads, tasks that emphasise one kind of change only, single problems, and differences in competence or expertise. All are also features likely to be found in everyday problem solving. Study 1 focuses on family contributions, based on reports by care givers about their current situation and their preferences for the involvement of other family members. Study 2 presents a standard family scenario and focuses on the views held by care givers, older adults, and community nurses about the reasonableness of various changes in participation. Results are discussed in terms of the ways situations such as care giving can help build a richer picture of collaborative cognition, one that is applicable to a variety of tasks and to all parts of the life span.

Workplace strategies and facilities management

This book provides comprehensive coverage of issues that facility managers in the property industry need to understand and apply in the pursuit of value for money over the life span of built facilities. The authors introduce the fast-growing discipline of facility management, examine the core competencies that facility managers should possess and study different contemporary drivers of change. The book emphasises the need to consider facilities management issues at the pre-design stage of the construction process, rather than only when the building is completed, in order to maximise value for money.

A question of continuing control -balancing building quality of housing and building codes

The Building Code of Australia seeks to establish “nationally consistent, minimum necessary standards of relevant, health, safety (including structural safety and safety from fire), amenity and sustainability objectives efficiently”. These goals are laudable – but where are the goals of quality and maintenance, which are also an essential part of achieving adequate and continuing health and safety for the built environment?

Defects such as dampness, settlement and cracking, staining, wood rot, termite damage, rusting, and roof leakage are common enough to suggest that there are still issues with building quality in housing. They are caused by a combination of initial poor workmanship and poor quality materials and latterly by poorly executed or inadequate maintenance.

Local architecture, developed over many years of trial and error, produce buildings linked to their climate and local materials (think of the typical “Queenslander” house). Today’s architecture imports technologies and materials from many differing countries and climates – that are not necessarily suitable for the location, nor is there necessarily the same quality control over the material quality and production. Inappropriate use and inadequate understanding of new materials and techniques can lead to the generation of further defects.

Whilst the building code contains provisions for initial-build material quality and workmanship, there is no continuing control over a house over its life span. Reliance is placed on advertising the need, for example, to employ qualified tradespeople; replace batteries in smoke detectors; and other good advice to help maintain housing to a minimum standard. Is this sufficient?

Mechanisms to make the transfer of knowledge to those who need to use it – be it the workforce or the houseowner – need to be improved. Should the building code be more visual and accessible in it’s content? Should the building code include provisions for maintenance? Should the building code require every house to have a “users manual” – much like a car? An extensive review of literature identifies the scale of the problem of poor quality housing and highlights some suggested causes – inadequate knowledge of the BCA by general housebuilders being one. However little work has been done to investigate what could be done to improve the situation. This work suggests that improvements to knowledge transfer would improve the quality of housing and a model of the knowledge transfer process is proposed, identifying those areas where the knowledge flows need to occur that would impact both the builders and users of housing.

Urban sustainability and market typologies : lessons from Tabriz Bazaar

The market is an essential component of urban form. Contemporary shopping malls can benefit from the inherent efficiencies of traditional markets. This paper addresses the development of sustainable models of market typologies based on a specific case study, the Bazaar of Tabriz in Iran.

As one of the biggest historical covered markets in the world (Moradi and Nassabi 2007), it remains an effective trading centre in the city. What are the lessons that make Tabriz a sustainable urban typology and what lessons can we draw from its spatial and operational structure?

To address this question, the paper presents two analytical studies of the urban and building morphology of Tabriz. First, the paper presents an analysis of the urban and social structure of the market based on Lynchian analysis. Second, it provides an analysis of the thermal, ventilation and lighting principles used in the buildings of the market and how they respond to the extreme climatic conditions of north-west Iran.

Rainfall and snow in one side and hot summers in the other, give the buildings in the city really critical performance in terms of life span during the years of operation.

The main target in this case study, is to illuminate the urban typological clarifications in the Bazaar of Tabriz, which wilt elucidate how parallel links between urban morphology (land cover) and urban typology (land use) in a defined urban planning can form a sustainable urban space. Moreover, how the case of this study can be an energy efficient complex with its own urban morphology.

The lessons of Tabriz for the development of contemporary markets are summarised in the paper and need to be addressed at two scales, namely the urban scale and the scale of the building.

A prospective study on building quality : enforcement of control in the Australian housing industry

The Australian housing industry is beset with quality issues with repeated building defects causing problems with customer satisfaction and housing performance. These defects are caused by a combination of initial poor workmanship and poor quality materials and subsequently by poorly executed or inadequate maintenance. These poor work practices increase the cost and maintenance of housing. The waste and rectification work generated by such practices means that the housing industry generally is not engaged with sustainability. Building Control is part of achieving quality of building output. Whilst the Australian Building Code has regulations for initial-build material quality and workmanship, there is no continuing control and effective enforcement over a house over its life span. Sustainability is not dealt with as a topic at all in the Building Code with only energy efficiency concerns regulated. Inadequate knowledge transfer, to the mainly small builders who produce the majority of Australia’s housing, is seen to be a key issue. Mechanisms to make the transfer of knowledge to those who need to use it need to be improved. Building regulations, for example, could be more visual and accessible in their content and small builders should be encouraged to update their knowledge and skills. This comparative research will guide industry service providers in improving their performance and suggest how overall housing quality can be improved (thereby reducing wasteful practices), by considering more appropriate mechanisms for knowledge transfer among industry service providers in the Australian housing industry.