Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Randolph A. Culp"'
Publikováno v:
Journal of Experimental Marine Biology and Ecology. 488:1-9
The goal of this study was to examine the potential effect of physiological states of phytoplankton cells on their lipids (phytol, sterols, alkenones, and fatty acids) and associated stable carbon isotopic compositions during microbial degradation. C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b09543baaf73d9c4902bd1661f379acd
https://doi.org/10.1016/j.jembe.2016.12.003
https://doi.org/10.1016/j.jembe.2016.12.003
Publikováno v:
Journal of Experimental Marine Biology and Ecology. 461:7-19
A series of laboratory experiments were conducted to examine effects of biochemical processes on phytoplankton lipids and their stable carbon isotopic compositions. Thalassiosira weissflogii and Emiliania huxleyi were axenically cultivated in batch c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c291d4818dc2d52e5cfefa2a8e6695f6
https://doi.org/10.1016/j.jembe.2014.07.010
https://doi.org/10.1016/j.jembe.2014.07.010
Publikováno v:
Aquatic Ecology. 43:825-841
We studied the biochemical degradation of organic matter comprising marine diatom, land grass, and salt marsh plant in estuarine ecosystems in two laboratory microcosms consisting of estuarine sediments and coastal seawater. The materials were incuba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fb9de21d75077b65c9ee61fbd6713f3f
https://doi.org/10.1007/s10452-008-9211-x
https://doi.org/10.1007/s10452-008-9211-x
Publikováno v:
Organic Geochemistry. 35:895-908
To evaluate molecular carbon isotopic fractionation of algal lipids during oxic and anoxic degradation, Emiliania huxleyi (a marine haptophyte) was incubated in seawater collected from two depths (30 and 930 m) in the Cariaco Basin. Three classes of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4273bfa4218c638b85db8d4023214a7a
https://doi.org/10.1016/j.orggeochem.2004.04.001
https://doi.org/10.1016/j.orggeochem.2004.04.001
Autor:
Randolph A. Culp, Li Zou, Julie Callahan, Robert F. Chen, Xu-Chen Wang, Mark A. Altabet, Ming-Yi Sun
Publikováno v:
Limnology and Oceanography. 49:297-302
High-molecular-weight dissolved organic matter (HMW-DOM, > 1,000 Daltons) is actively involved in the global biogeochemical cycling of many elements, but its carbon sources and detailed formation pathways are still not well understood. In this study,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2dc93c673fa9f1c34bab7237f30ab7a3
https://doi.org/10.4319/lo.2004.49.1.0297
https://doi.org/10.4319/lo.2004.49.1.0297
Publikováno v:
Estuarine, Coastal and Shelf Science. 56:1187-1194
In this study, we examine the distribution and carbon stable isotope signature of dissolved organic carbon (DOC) and humic substances (HS) along a salinity gradient in the Altamaha and Satilla River estuaries. The maximum DOC concentrations in the Al
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7ce21c3a36067a356a2b44858d227e3
https://doi.org/10.1016/s0272-7714(02)00330-x
https://doi.org/10.1016/s0272-7714(02)00330-x
Publikováno v:
Limnology and Oceanography. 45:1753-1763
Particulate organic carbon (POC) is an important component in the carbon cycle of estuarine systems. Many studies have utilized carbon isotopic composition (d 13 C-POC) to estimate the origin of POC. Most of the early studies were restricted to areas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::189fbe6d15be5d95c9fb1706e61fabea
https://doi.org/10.4319/lo.2000.45.8.1753
https://doi.org/10.4319/lo.2000.45.8.1753
Publikováno v:
Journal of Agricultural and Food Chemistry. 45:2153-2157
A practical means of using tritium to authenticate a natural versus a synthetic (petroleum-derived) origin of food and flavoring extracts has been demonstrated. Extracts derived from natural botanicals reflect a tritium content incorporated during th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89ca4ae126bee2f5aa90d629fd842cf1
https://doi.org/10.1021/jf960758v
https://doi.org/10.1021/jf960758v
Autor:
Randolph A. Culp, John E. Noakes
Publikováno v:
Journal of Agricultural and Food Chemistry. 40:1892-1897
A study was made relating 14 C, δ 13 C, and δD isotopic abundances for 11 different flavor materials: acetaldehyde, amyl acetate, anethole, benzeldehyde, cinnamic aldehyde, ethyl acetate, ethyl butyrate, ethyl caproate, linalool, methyl salicylate,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d8fcb935fae3f51cdff715455c0fbdd3
https://doi.org/10.1021/jf00022a033
https://doi.org/10.1021/jf00022a033
Autor:
John E. Noakes, Randolph A. Culp
Publikováno v:
Journal of Agricultural and Food Chemistry. 38:1249-1255
Cinnamic aldehyde and benzaldehyde samples were isolated from botanical sources and compared to labeled isolates from natural origins and those synthetically produced. Products synthesized from petrochemical precursors yielded {delta}{sup 13}C and {d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e16b52fb9c0601085f948abe63f7eb9
https://doi.org/10.1021/jf00095a021
https://doi.org/10.1021/jf00095a021