Soils and vegetation were analyzed in 20 lodgepole pine (Pinus contorta) forest stands, varying in age from 50 to 350 years, that had initiated following stand-replacing fire. Our goal was to determine how nitrogen availability (NH4 –N) and microbial community composition varied with stand age-class and to determine whether differences could be explained by canopy, soil, or understory character...

Cross-country variation in effective retirement age is usually attributed to institutional differences that affect individuals’ incentives to retire. This paper suggests a different approach to explain this variation. Since working individuals in different occupations naturally retire at different ages, the composition of occupations within an economy matters for its average effective retiremen...

OBJECTIVE To determine an association between body composition analysis and physical fitness in the Saudi population and derive gender specific physical fitness equations. METHODS A total of 530 healthy Saudi adults aged 15-72 years (mean 37.16±14.12 years) were enrolled in this study. Body composition analysis was assessed by bioelectrical impedance analysis (BIA), with a commercially availa...

BACKGROUND Upper-arm muscle area (UMA), upper-arm fat area (UFA), arm-fat index (AFI), upper-arm fat estimate (UFE) and upper-arm muscle estimate (UME) was introduced for the assessment of body-composition. This cross-sectional study assessed age-sex specific upper-arm composition and nutritional status among children and adolescents. METHODS The present cross-sectional study was conducted am...

There are undeniable changes in the body's composition with old age, and these changes can bring about a plethora of physiological consequences affecting levels of function, and current and subsequent health (Rosenberg, 1989; Heymsfield et al. 1995). Health and function are interrelated states within the ageing process (Nagi, 1976), and transitions amongst them and disease and disability are af...

The high tree diversity of subtropical forests is linked to the biodiversity of other trophic levels. Disentangling the effects of tree species richness and composition, forest age, and stand structure on higher trophic levels in a forest landscape is important for understanding the factors that promote biodiversity and ecosystem functioning. Using a plot network spanning gradients of tree dive...