Browsing ELibrary by Author "Macko S.A."

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ABUNDANCE AND STABLE CARBON ISOTOPE COMPOSITION OF AMINO ACIDS IN MOLECULAR WEIGHT FRACTIONS OF FOSSIL AND ARTIFICIALLY AGED MOLLUSK SHELLS

Qian Y.; Engel M.H.; Goodfriend G.A.; Macko S.A. (1995)

Amino acid abundances in molecular weight fractions (separated by ultrafiltration) of artificially aged carbonate shells and fossil shells are reported. Hydrolyzable amino acids were primarily concentrated in the The δ13C ...
DEPENDENCE OF PHYTOPLANKTON CARBON ISOTOPIC COMPOSITION ON GROWTH RATE AND [CO2]AQ: THEORETICAL CONSIDERATIONS AND EXPERIMENTAL RESULTS

Laws E.A.; Popp B.N.; Bidigare R.R.; Kennicutt M.C.; Macko S.A. (1995)

The carbon isotopic composition of the marine diatom Phaeodactylum tricornutum (δ13Cp) was measured over a series of growth rates (μ) in a continuous culture system in which both δ13CCO2 and [CO2]aq were determined. In ...
DISTRIBUTION, STEREOCHEMISTRY, AND STABLE ISOTOPE COMPOSITION OF AMINO ACIDS IN K/T BOUNDARY SEDIMENTS

Brisman K.; Engel M.H.; Macko S.A. (2001)

The Cretaceous/Tertiary (K/T) boundary, with an age of 65 million years before present, is associated with the mass extinctions of dinosaurs and other terrestrial and marine organisms. Evidence for the K/T boundary is ...
MOLECULAR, 13C, AND 14C EVIDENCE FOR THE ALLOCHTHONOUS AND ANCIENT ORIGIN OF C16-C18 N-ALKANES IN MODERN SOILS

Lichtfouse E.; Bardoux G.; Mariotti A.; Balesdent J.; Ballentine D.C.; Macko S.A. (1997)

The heterogeneous isotopic composition of C3 and C4 plants can be used to follow the fate of plant carbon into soil organic molecules. Thus, after 23 years of maize cropping (C4) on a soil which was previously under C3 ...
SEASONAL VARIATION IN THE STABLE CARBON AND NITROGEN ISOTOPE BIOGEOCHEMISTRY OF A COASTAL COLD OCEAN ENVIRONMENT

Ostrom N.E.; Macko S.A.; Deibel D.; Thompson R.J. (1997)

The carbon and nitrogen isotopic composition of seston, sinking POM, and inorganic nitrogen was determined on a seasonal basis in a coastal cold-ocean embayment, Conception Bay, Newfoundland. Isotopic variation in particulate ...
STABLE ISOTOPIC ANALYSIS OF INDIVIDUAL CARBOHYDRATES BY GAS CHROMATOGRAPHIC/COMBUSTION/ISOTOPE RATIO MASS SPECTROMETRY

Macko S.A.; Ryan M.; Engel M.H. (1998)

Through the gas chromatographic/combustion/isotope ratio mass spectrometry (GC/C/IRMS) determinations of alditol acetate derivatives of monosaccharides, rapid analysis of the δ13C of individual sugars can be accomplished ...
THE STEREOCHEMISTRY OF AMINO ACIDS IN THE MURCHISON METEORITE

Engel M.H.; Macko S.A. (2001)

The questions of how, where and when life originated in our solar system remain largely unanswered. Some advances have been made with respect to abiotic synthesis of the key molecules deemed essential for the construction ...
VARIABILITY OF STABLE CARBON ISOTOPIC COMPOSITIONS IN INDIVIDUAL FATTY ACIDS FROM COMBUSTION OF C4 AND C3 PLANTS: IMPLICATIONS FOR BIOMASS BURNING

Ballentine D.C.; Macko S.A.; Turekian V.C. (1998)

The isotopic characterization of trace organic species produced during biomass burning may allow a better understanding of the source and fate of combustion-derived organic matter. In order to assess the utility of compound ...

Browsing ELibrary by Author "Macko S.A."

Browsing ELibrary by Author "Macko S.A."

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