Abstract Aims Plant investment in sexual reproduction is affected by nitrogen (N): phosphorus (P) stoichiometry. It has been suggested that an important adaptation to strong P limitation reduced reproduction. We aim investigate the specific influence of N:P on performance within and between grassland species. Methods Eleven species were selected ten plots covering N limitation, co-limitation li...

(COPD) is preventable and treatable. It is characterised by airflow limitation which is not fully reversible and is progressive. The pathophysiological basis is an abnormal inflammatory response by the lung to inhaled noxious particles or gases, particularly cigarette smoke.1 In the developing world exposure to indoor air pollution, such as fumes from biomass fuels for cooking and heating, is a...

Recent large-scale seagrass declines have prompted experimental investigations of potential mechanisms. Although many studies have implicated eutrophication or reductions of epiphyte grazers in these declines, few experiments have simultaneously manipulated both factors to assess their relative effects. This study used meta-analyses of 35 published seagrass studies to compare the relative stren...

The seasonal succession of all major planktonic groups, i.e., phytoplankton, bacteria, heterotrophic flagellates, ciliates, rotifers, and crustaceans, was investigated during five years (1987-1991) of weekly sampling with elaborate sampling methods and microscopic countings. This allows to study the seasonal changes of the biomass and production allocation patterns within the epilimnetic food w...

OBJECTIVES To understand how caring for grandchildren affects the physical and mental health of grandparents in Taiwan. METHOD Grandparents aged 50 and older from 4 waves of the Taiwan Longitudinal Study on Aging (1993-2003, n = 3,711) were divided into 7 categories based on living arrangement and caregiving history. Generalized estimation equations controlling for sociodemographic characteri...

toxicity and damages caused by soil pollution with crude oil and its microbial responses may depend on nitrogen bioavailability and its form. so, the main objective of this study is to investigate the effects of crude oil and various forms of n consumption on c mineralization and microbial biomass. the experiment was done in the form of factorial (3×4) design using crd (completely randomized de...