Isotope labelling is a powerful tool to study elemental cycling within terrestrial ecosystems. Here we describe a new multi-isotope technique to label organic matter (OM). We exposed poplars (Populus deltoides× nigra) for 14 days to an atmosphere enriched in CO2 and depleted in H 2 O. After 1 week, the water-soluble leaf OM (δC= 1346± 162 ‰) and the leaf water were strongly labelled (δO=−63± 8,...

BACKGROUND Previous research has shown exposure to air pollution increases the risk of adverse birth outcomes, although the effects of residential proximity to significant industrial point sources are less defined. The objective of the current study was to determine whether yearly reported releases from major industrial point sources are associated with adverse birth outcomes. METHODS Materna...

the difficult to handle and store zinc borohydride, zn(bh4)2, is stabilized by supporting it on polyvinylpyridine. this new mild, efficient, selective, and regenerable polymer supported borohydride reducing agent reduces a variety organic compounds such as, aldehydes, a-b-unsaturated carbonyl compounds, acid chlorides, epoxides, disulfides, as well as reductive acetylation of carbonyl compounds...

Carica papaya L. leaves have been used in ethnomedicine for the treatment of fevers and cancers. Despite its benefits, very few studies on their potential toxicity have been described. The aim of the present study was to characterize the chemical composition of the leaf extract from 'Sekaki' C. papaya cultivar by UPLC-TripleTOF-ESI-MS and to investigate the sub-acute oral toxicity in Sprague Da...

To gain a better understanding of the biochemical basis for partitioning of photosynthetically fixed carbon between leaf and grain, a (14)CO(2) labeling study was conducted with field-grown maize plants 4 weeks after flowering. The carbon flow was monitored by separation and identification of (14)C assimilates and (14)C storage components within each tissue during the chase period (from 4 to 96...

Abstract: Isotope labelling is a powerful tool to study elemental cycling within terrestrial ecosystems. Here we describe a new multi-isotope technique to label organic matter (OM). We exposed poplars (Populus deltoides x nigra) for 14 days to an atmosphere enriched in 13CO� and depleted in 2H�1�O. After one week, the water-soluble leaf OM (�13C = 1346 ± 162‰) and the leaf water were strongly l...

Current evidence indicates that fungi in streams are essentially restricted to coarse particulate organic matter such as decomposing leaf litter and wood. As the size of organic particles decreases, the proportion of fungal biomass also decreases. In come particulate organic matter, fungal biomass can be substantial, in some streams exceeding 15% of the total detrital m a s in relatively labile...

Bipod nettle Utrica dioica L has therapeutic properties in treatment of human chronic diseases such as anemia, joints pain and skin diseases. In this research the major components of extracts in different parts of plant (root, stem and leaf) were identified by gas chromatography (GC) apparatus. Twenty compounds were identified, the most important of which were Neophytadiene (25.21%), Phtaleic a...