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 Pleistocene and …

The Quaternary begins 2.58 ka ago and is divided into Pleistocene (2.58–11.7 ka) and Holocene (11.7 ka to present) (Gibbard and Cohen, 2008). The most peculiar feature of the Quaternary ice ages was …

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 reviewed papers under …

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 review …

Quaternary Structure A complex composed of multiple protein chains (subunits) is defined as a quaternary structure, also called a multimer, or biological assembly. Many proteins form their …

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 Research …

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 sequences …

Nov 1, 2024 · We report on the incorporation of quaternary amines into polymerized high internal phase emulsions (polyHIPEs) and demonstrate feasibility for potenti…

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 levocarnitine 3 (Fig. 1). …

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 polycyclic …