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On the cover: About 100,000 years ago, Diverse Homo species coexisted with our own species Homo sapiens. The Harbin cranium, or the Dragon Man, is one of the best preserved Middle Pleistocene human fossils. The cranium has a large cranial capacity falling in the range of modern humans, but is combined with a mosaic of primitive and derived characters. Phylogenetic analyses suggest that the diversification of the Homo genus had a much more distant past than previously presumed. The Harbin cranium and some other Middle Pleistocene human fossils from China represent the third human lineage that is the sister group of H. sapiens and has closer relationships with H. sapiens than Neanderthals with H. sapiens. Multiple Homo lineages in Africa, Asia and Europe probably had a strong capability for long-distance dispersal, but remained in relatively small and isolated populations. Diverse palaeoenvironments in Asia may have produced a varied biogeographic sink for human evolution.
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Position: Home > issue > August 28, 2021 Volume 2, Issue 3
Adsorption and Desorption Mechanisms on Graphene Oxide Nanosheets: Kinetics and Tuning
Category:   Report   Download:  PDF  Figure
Author: Xiaodan Qu, Qiong Hu, Zhongqian Song, Zhonghui Sun, Baohua Zhang, Jialing Zhong, Xuyou Cao, Yuanjin Liu, Bolin Zhao, Zhenbang Liu, Yujie Shen, Yu Bao, Zhenxin Wang, Yuwei Zhang, Li Niu

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Graphical abstract

A knowledge of the adsorption and desorption behavior of sorbates on surface adsorptive site (SAS) is the key to optimizing the chemical reactivity of catalysts. However, direct identification of the chemical reactivity of SASs is still a challenge due to the limitations of characterization techniques. Here, we present a new pathway to determine the kinetics of adsorption/desorption on SASs of graphene oxide (GO) based on total internal reflectance fluorescence microscopy. The switching on and off of the fluorescent signal of SAS lit by carbon dots (CDs) was used to trace the adsorption process and desorption process.





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