Quaternary Period In subject area: Earth and Planetary Sciences The Quaternary Period is defined as the most recent geologic era spanning the last 2.6 million years, divided into the …

Quaternary Environments and Humans (QEH) is the full Open Access, official journal of the International Union for Quaternary Research (INQUA). The journal aims to publish peer …

Quaternary Science Advances (QSA) is an international and fully Open Access journal supporting the rapid publication of peer-reviewed original research articles, short communications and …

Quaternary International is an international, peer-reviewed journal that embraces all aspects related to Quaternary Science. It is the official journal of the International Union for Quaternary …

Dec 5, 2022 · Quaternary ammonium agents, a class of organic cationic salts of substituted ammonium compounds [1], exist widely in nature, such as acetylcholine 1, betaine 2, and …

Quaternary During the past 2 million years, climatic fluctuations of dry glacial and wet interglacial periods affected the geographic ranges of both temperate and tropical areas. Palynological …

The onset of the recent ice age dates back much further than the Quaternary. An overall, long-term trend of cooling global climates occurred throughout the Tertiary Period. The opening of …

This chapter reviews that in the Quaternary cold stages, glaciers developed on the higher mountains of the Qinghai-Xizang plateau and in other regions…

Mar 5, 2023 · Determination of selected quaternary ammonium compounds by liquid chromatography with mass spectrometry. Part I. Application to surface, waste and indirect …

Sep 1, 2025 · Creating all-carbon quaternary centers remains a formidable challenge in synthetic organic chemistry, despite their widespread occurrence in natural products, particularly in …