scholarly journals Stable isotope studies on Mono Lake (California). 1. d18 in lake sediments as proxy for climatic change during the last 150 years

1997 ◽  
Vol 42 (2) ◽  
pp. 230-238 ◽  
Author(s):  
Hong-Chun Li ◽  
Teh-Lung Ku ◽  
Lowell D. Stott ◽  
Robert F. Anderson
Keyword(s):  
Stable Isotope ◽  
Lake Sediments ◽  
Climatic Change ◽  
Mono Lake ◽  
Isotope Studies

RECONCILING EVIDENCE FROM OUTCROPS AND DEEP-LAKE SEDIMENTS: THE CONUNDRUM OF OXYGEN ISOTOPES IN GLACIAL-ERA MONO LAKE, CALIFORNIA

2016 ◽  
Author(s):  
Susan Herrgesell Zimmerman ◽  
◽  
Guleed A.H. Ali ◽  
Sidney R. Hemming
Keyword(s):  
Lake Sediments ◽  
Oxygen Isotopes ◽  
Mono Lake ◽  
Deep Lake

SOURCES OF CARBONATE PRECIPITATION IN MONO LAKE SEDIMENTS: δ18O AND CARBONATE CLUMPED ISOTOPES AS LAKE LEVEL PROXIES

2017 ◽  
Author(s):  
Miquela Ingalls ◽  
◽  
Sophie Westacott ◽  
Makayla Betts ◽  
Jana Meixnerova ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Lake Level ◽  
Mono Lake ◽  
Carbonate Precipitation ◽  
Clumped Isotopes

Stable isotope studies in the Salitroso Lake Basin (southern Patagonia, Argentina): assessing diet of Late Holocene hunter-gatherers

2009 ◽  
Vol 19 (2) ◽  
pp. 297-308 ◽  
Author(s):  
A. Tessone ◽  
A. F. Zangrando ◽  
G. Barrientos ◽  
R. Goñi ◽  
H. Panarello ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Late Holocene ◽  
Lake Basin ◽  
Hunter Gatherers ◽  
Southern Patagonia ◽  
Isotope Studies

scholarly journals Stable isotope studies of paleokarst-hosted uranium deposits in China.

1998 ◽  
Vol 32 (2) ◽  
pp. 103-115 ◽  
Author(s):  
Maozhong Min ◽  
Junqi Wu
Keyword(s):  
Stable Isotope ◽  
Uranium Deposits ◽  
Isotope Studies

Effects of development on techniques for calcium stable isotope studies in children

1994 ◽  
Vol 23 (6) ◽  
pp. 357-361 ◽  
Author(s):  
Kimberly O. O'Brien ◽  
Steven A. Abrams
Keyword(s):  
Stable Isotope ◽  
Isotope Studies

scholarly journals Separation and 14C Dating of Pure Pollen from Lake Sediments: Nanofossil AMS Dating

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 557-560 ◽  
Author(s):  
Austin Long ◽  
Owen K. Davis ◽  
Jeanne de Lanois
Keyword(s):  
Organic Matter ◽  
Lake Sediments ◽  
Mono Lake ◽  
Bulk Sediment ◽  
Clean Room ◽  
14C Dating ◽  
Ams Dating

We have developed and tested a practical device for manually separating pollen from pollen concentrates in sufficient quantity for AMS 14C dating. It is a combination of standard, commercially available equipment handled in a clean room by an individual trained to recognize pollen. A typical example requires about 15–20 h of hand-picking under the microscope. We show the usefulness of this procedure with results on a mid-Holocene segment from a core from Mono Lake. Sediments from this hardwater lake contain pollen and finely disseminated organic matter, but no macrofossils. The pollen dated ca. 1000 yr younger than the bulk sediment. The sediment “date” is most likely affected by incorporation of limestone-derived carbon, and is erroneously old.

scholarly journals Present-Day Radiocarbon Content of Select Flavoring Compounds Reveals Vanillin Production Pathway

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1819-1826 ◽  
Author(s):  
Randy Culp ◽  
G V Ravi Prasad
Keyword(s):  
Stable Isotope ◽  
Fossil Fuel ◽  
Agricultural Products ◽  
Clove Oil ◽  
Isotopic Data ◽  
Established Method ◽  
New Methods ◽  
Isotopic Methods ◽  
Isotope Studies ◽  
The University

Radiocarbon and stable isotope determination in foods, flavors, and beverages, for the authentication of source material and process of formation, is a well-established method of identity used in industry. New methods of provenance determination, using stable isotopes of oxygen and hydrogen, have added to the host of other isotopic methods used for characterizing natural or botanically derived products. The unambiguous determinant of a product's fossil fuel origin be it from petroleum, natural gas, or coal, is through the measurement of its 14C content. The 14C content can also be used to determine the fraction dilution of recently grown and harvested material with that derived from fossil fuel, and even confirms the vintage of agricultural products based on the well-established decrease of bomb-produced atmospheric 14C. This paper documents 14C measurements at the University of Georgia's Center for Applied Isotope Studies accelerator mass spectrometry and stable isotope laboratories, over the last 3 yr, for 10 important flavoring compounds. By establishing an accurate and current level of 14C in botanically derived products, we were able to confirm a particular source for vanilla production, the most popular consumer flavor in the marketplace. Over the years, vanilla extract has been produced less and less from vanilla beans (Vanilla planifolia), particularly those from Madagascar and the Comoros Islands, and more from other botanical precursors such as ferulic acid, clove oil, and guaiacol. We report isotopic data to support this precursor for vanilla production based on high 14C levels accumulated during the tree's life, incorporated in the tree rings and their associated stable isotope abundances.

Stable Isotope Studies of Cantharidin Biosynthesis by Epicauta Pestifera

1992 ◽  
pp. 261-286
Author(s):  
John P. McCormick ◽  
James E. Carrel
Keyword(s):  
Stable Isotope ◽  
Isotope Studies
Sign in / Sign up

Export Citation Format

Share Document