A series of 24-nor-triterpenoids; 24-nor-urs-12-ene, 24-nor-olean-12-ene and 24-nor-lupane
have been identified in sediments and crude oils by comparison with standards obtained by …

The triterpenol geochemistry of the Santa Monica Basin from the Southern California
Borderland, off the USA, is described from the study of two sets of trap deployments, five box …

To address the threats of global warming and human activities to freshwater shallow lake
ecosystems, it is imperative to comprehend the long-term evolutionary history of lake …

Long chain n-alkanes (C 27–C 33) in lake sediment records are commonly considered to be
terrestrial plant biomarkers when reconstructing paleoclimatic and paleolimnological history …

One monoaromatic tricyclic diterpane and two aromatic tricyclic diterpanes were found in
three low-maturity source rocks and five crude oils of the Tertiary Shahejie Formation in …

A series of novel tetracyclic triterpanes based on the lanostane skeleton, ranging in carbon
number from C 30 to C 32, were identified for the first time in Eocene lacustrine deposits of …

Lakes are one of the most important freshwater resources on Earth and they provide a wide
range of ecosystem services. However, due to rapid economic development and the …

In order to examine how natural backgrounds and anthropogenic activities influenced the n-
alkanol profiles of lake sediments, abundances and compositions of n-alkanols were …

Peats in a sediment core from Ruoergai bog, which has a cold and moist plateau climate
with major source input from herbaceous plants, have been studied by GC–MS in order to …

Previous multi-proxy records have revealed the advantages of well-preserved and long-
scale geological archives from the lake sediments of Daping swamp in the western Nanling …