The age-related increase in fracture risk is disproportionate to the loss of areal bone mineral density (aBMD) that naturally occurs with aging.
Some memory loss naturally occurs with aging, but general forgetfulness (not remembering a person's name) doesn't interfere with one's life, says Paul Bendheim, M.D., clinical professor of neurology at the University of Arizona College of Medicine.
It has been suggested that maintenance of cognitive ability over time involves adaptive changes that compensate for deficits such as reduced synaptic plasticity [ Blau et al., 2011], which naturally occur with aging [ Mauceri et al., 2011; Raz and Rodrigue, 2006].
Companies including Denbury Resources and Kinder Morgan have piped carbon dioxide from naturally occurring sources into aging oil fields to push out crude that traditional drilling is unable to reach.
We previously published that hyperactivation of IGF-1R signaling, induced by the overexpression of Δ40p53 (p44), accelerates a naturally occurring and age-associated TrkA-to-p75NTR switch in the brain that activates the lipid second messenger ceramide (Costantini et al., 2005, 2006).
Prolonged culturing of fibroblasts results in telomere shortening, a naturally occurring phenomenon associated with aging.
The daily intake of naturally occurring folate among women aged 19 44 years in this study (average 248 μg/day in the Phase II sample) was similar to values found in other studies of women's diet [ 34, 35].
Skin aging is caused by repeated exposure to UV radiation (photoaging) or by naturally occurring biological processes (intrinsic aging).
Naturally occurring rat models of cognitive aging are useful tools to investigate the underlying neurobiological changes that contribute to memory loss in later life.
Animal models of OA include naturally occurring OA in (experimentally accelerated) aging, transgenic models, and surgically or chemically induced OA (summarized in Tables 1 and 2).
