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Emission factors for polycyclic aromatic hydrocarbons from biomass burning
Emission factors for 19 polycyclic aromatic hydrocarbons were measured during wind tunnel simulations of open burning for agricultural and forest biomass fuels including cereal grasses, agricultural
Steroid induced exocytosis: the human sperm acrosome reaction.
It is argued that progesterone is present at the site of fertilization of placental mammals in concentrations sufficient for activity, and hence provides a mechanism of inducing the acrosome reaction, an exocytotic event, in vivo.
Vitamin A concentrations in liver determined by isotope dilution assay with tetradeuterated vitamin A and by biopsy in generally healthy adult humans.
The vitamin A status in 11 generally healthy surgical patients was estimated by measuring the dilution of a 45-mg oral dose of tetradeuterated retinyl acetate and the total body reserves and liver concentrations of vitamin A were calculated.
Hopanoid lipids compose the Frankia vesicle envelope, presumptive barrier of oxygen diffusion to nitrogenase.
It is reported here that purified vesicle envelopes consist primarily of two hopanoid lipids, rather than of glycolipids, as is the case in cyanobacteria, which represents a layer specific to the locus of nitrogen fixation that is biosynthetically uniquely derived.
Formation of Nitrating and Chlorinating Species by Reaction of Nitrite with Hypochlorous Acid
It is proposed that NO−2 reacts with HOCl by Cl+ transfer to form both cis- and trans-chlorine nitrite (Cl-ONO) and Cl-NO2 as intermediates that modify tyrosine by either direct reaction or after decomposition to reactive free and solvent-caged Cl· and ·NO1 as reactive species.
Direct characterization of protein adducts of the lipid peroxidation product 4-hydroxy-2-nonenal using electrospray mass spectrometry.
Results further demonstrate the availability of the protein-bound aldehyde for subsequent reaction or as a site of molecular recognition and suggest that most methods for determining 4-hydroxy-2-nonenal in biological tissues or fluids are based on erroneous assumptions that hydrazines or hydroxylamines release 4- Hydroxylamine from proteins.
Cholesterol Oxides in Foods of Animal Origin
The earliest discovery of an oxidation product of cholesterol from a natural source was reported in 1940. Additional discoveries of cholesterol oxidation products (COPS) in edible food products
High alpha-tomatine content in ripe fruit of Andean Lycopersicon esculentum var. cerasiforme: developmental and genetic aspects.
A variant of Lycopersion esculentum var. cerasiforme is described that deviates from the typical form of the entire species, including cultivated tomatoes, in possessing high levels (500-5000
Particle concentrations, gas-particle partitioning, and species intercorrelations for polycyclic aromatic hydrocarbons (PAH) emitted during biomass burning
Abstract Eight types of agricultural and forest fuels including 4 cereal crop residues and 4 wood fuels were burned in a combustion wind tunnel to simulate the open burning of biomass. Concentrations
Stable isotope methods for the study of beta-carotene-d8 metabolism in humans utilizing tandem mass spectrometry and high-performance liquid chromatography.
The ability to resolve the beta-carotene isotopomers by HPLC makes it feasible for investigators without mass spectrometers to investigate the dynamics of absorption and metabolism of beta- carotene-d8 in humans.