Many economists argue that high mortality is a major restraint on human capital accumulation and, in turn, growth. A short time horizon makes a person less likely to invest. Therefore, having a lower life expectancy reduces the incentive to obtain schooling. However, there is controversy over whether this theoretical effect is empirically important. Most previous research designs have been unab...

Bromine has a strong resource dependence. With the sharp decline of total amount and grade traditional brine resources, difficulty mining is increasing day by day, shortage bromine supply demand become normal situation. Therefore, it urgent to find new sources resources develop corresponding extraction technologies. Bromine-containing waste salt source bromine. The mature technology achievement...

OBJECTIVE Self-management ability (SMA) is the ability to obtain those resources necessary for the production of well-being. With age, SMA becomes increasingly important, if one has a large variety of resources, physical and psychosocial losses due to the aging process can be substituted or compensated for. This study examined whether an increase in SMA would ensure sustainable levels of positi...

In women, oocytes arrest development at the end of prophase of meiosis I and remain quiescent for years. Over time, the quality and quantity of these oocytes decreases, resulting in fewer pregnancies and an increased occurrence of birth defects. We used the nematode Caenorhabditis elegans to study how oocyte quality is regulated during aging. To assay quality, we determine the fraction of oocyt...

Age-related decline in cognitive capacities has been attributed to a generalized slowing of processing speed and a reduction in working memory (WM) capacity. Nevertheless, it is unclear how age affects visuospatial WM recognition and its underlying brain electrical activity. Whether age modulates the effects of memory load or information maintenance duration, which determine the limits of WM, r...

Kaka (Nestor meridionalis) populations have been declining in New Zealand since European occupation, largely because of predation and competition from introduced animals, forest destruction and fragmentation, and hunting pressure. They are now considered a threatened species. Kaka may be one of our most difficult species to manage because they continue to decline through the combined effects of...

A problem common to biology and economics is the transfer of resources from parents to children. We consider the issue under the assumption that the number of offspring is unknown and can be represented as a random variable. There are 3 basic assumptions. The first assumption is that a given body of resources can be divided into consumption (yielding satisfaction) and transfer to children. The ...

An iconic Australian marsupial is under threat from a disease, which is proving a major challenge for conservationists wishing to ensure the survival of the species, the Tasmanian devil. Hannah Robertson reports on their efforts.