K H Freeman
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Explore the profile of K H Freeman including associated specialties, affiliations and a list of published articles.
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Articles
16
Citations
175
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Recent Articles
1.
Fulton J, Arthur M, Thomas B, Freeman K
Geobiology
. 2018 Mar;
16(4):429-445.
PMID: 29577577
The carbon and nitrogen isotopic signatures of chloropigments and porphyrins from the sediments of redox-stratified lakes and marine basins reveal details of past biogeochemical nutrient cycling. Such interpretations are strengthened...
2.
Hamilton T, Welander P, Albrecht H, Fulton J, Schaperdoth I, Bird L, et al.
Geobiology
. 2017 Oct;
15(6):784-797.
PMID: 29035021
Little Salt Spring (Sarasota County, FL, USA) is a sinkhole with groundwater vents at ~77 m depth. The entire water column experiences sulfidic (~50 μM) conditions seasonally, resulting in a...
3.
Meyer K, Macalady J, Fulton J, Kump L, Schaperdoth I, Freeman K
Geobiology
. 2011 Jun;
9(4):321-9.
PMID: 21682840
Organic biomarkers in marine sedimentary rocks hold important clues about the early history of Earth's surface environment. The chemical relicts of carotenoids from anoxygenic sulfur bacteria are of particular interest...
4.
Dias R, Freeman K
Anal Chem
. 2011 Jun;
69(5):944-50.
PMID: 21639231
Solid-phase microextraction (SPME) was used to facilitate the measurement of stable carbon isotope compositions (at natural abundance) of six organic compounds representing four compound classes in aqueous solution. Toluene, methylcyclohexane,...
5.
Pearson A, Huang Z, Ingalls A, Romanek C, Wiegel J, Freeman K, et al.
Appl Environ Microbiol
. 2004 Sep;
70(9):5229-37.
PMID: 15345404
Glycerol dialkyl glycerol tetraethers (GDGTs) are core membrane lipids of the Crenarchaeota. The structurally unusual GDGT crenarchaeol has been proposed as a taxonomically specific biomarker for the marine planktonic group...
6.
Huang Y, Street-Perrott F, Metcalfe S, Brenner M, Moreland M, Freeman K
Science
. 2001 Sep;
293(5535):1647-51.
PMID: 11533488
Although C4 plant expansions have been recognized in the late Miocene, identification of the underlying causes is complicated by the uncertainties associated with estimates of ancient precipitation, temperature, and partial...
7.
Mandernack K, Kinney C, Coleman D, Huang Y, Freeman K, Bogner J
Environ Microbiol
. 2001 Feb;
2(3):298-309.
PMID: 11200431
Emissions of N2O from cover soils of both abandoned (> 30 years) and active landfills greatly exceed the maximum fluxes previously reported for tropical soils, suggesting high microbial activities for...
8.
Bidigare R, Fluegge A, Freeman K, Hanson K, Hayes J, Hollander D, et al.
Global Biogeochem Cycles
. 1997 Jun;
11(2):279-92.
PMID: 11540616
The carbon isotopic fractionation accompanying formation of biomass by alkenone-producing algae in natural marine environments varies systematically with the concentration of dissolved phosphate. Specifically, if the fractionation is expressed by...
9.
Merritt D, Freeman K, Ricci M, Studley S, Hayes J
Anal Chem
. 1995 Jul;
67(14):2461-73.
PMID: 11536720
Conditions and systems for on-line combustion of effluents from capillary gas chromatographic columns and for removal of water vapor from product streams were tested. Organic carbon in gas chromatographic peaks...
10.
Freeman K, Boreham C, Summons R, Hayes J
Org Geochem
. 1994 Jan;
21(10-11):1037-49.
PMID: 11539437
Polycyclic aromatic hydrocarbons with varying degrees of aromatization were isolated from the Eocene Messel Shale (Rheingraben, Germany). The high abundances of these compounds and their structural resemblances to cyclic triterpenoid...