The long-unresolved issue of CO2 release and the resulting atmospheric change can be solved through application effective catalysts. Thus, single-atom catalysts (SACs) have been rapidly developed for reduction reaction (CO2RR), as they show improved catalytic metrics enable generation C2+ products. Among numerous novel SACs, such those based on graphene, metal–organic frameworks, covalent organ...

Many microorganisms synthesize a wide range of surface active compounds (SACs), classified according to their molecular weights, properties and localizations. The low molecular weight SACs or biosurfactants lower the surface tension at the air/water interfaces and the interfacial tension at oil/water interfaces, whereas the high molecular weight SACs, also known as bioemulsifiers, are more effe...

The purpose of this article was to evaluate the accuracy of predicting amnionicity using the number of yolk sacs by diagnostic ultrasound examination in monochorionic (MC) multifetal pregnancies between 7 + 0 and 9 + 6 gestational weeks. A total of 97 patients with MC multifetal pregnancies underwent early ultrasound examination from 2004 to 2014 at Cheil General Hospital and Women's Healthcare...

Non-precious metal single-atom catalysts (NPM-SACs) with unique electronic structures and coordination environments have gained much attention in electrocatalysis owing to their low cost, high atomic utilization, performance. NPM-SACs on carbon support (NPM-SACs/CS) are promising because of the substrate a large surface area, excellent electrical conductivity, chemical stability...

The emergence of single atom sites as a frontier research area in catalysis has sparked extensive academic and industrial interest, especially for energy, environmental chemicals production processes. Single catalysts (SACs) have shown remarkable performance variety catalytic reactions, demonstrating high selectivity to the products long lifespan, stability more importantly atomic metal utiliza...

The unique structures of single-atom catalysts (SACs) endow them with widespread energy applications. This review summarized the achievements multifarious synchrotron-radiation characterization methods in studying local environments SACs.

This paper investigates an idea that was put forward (and hinted at in Fitch, 2000) by Tecumseh Fitch at the Cradle of Language conference in Stellenbosch, South Africa. The idea is that air sacs may have played an important role in early hominid vocalizations. Many other primates have air sacs, notably chimpanzees, gorillas and orangutans. It is therefore likely that our latest common ancestor...

A possible function of laryngeal air sacs in apes and gibbons was investigated by examining the relationships between air sac distribution, call rate, call duration and body weight in a phylogenetic context. The results suggest that lack of sacs in the smaller gibbons and in humans is a derived feature. Call parameters in primates, such as rate and duration, scaled to resting breathing rate (an...

The Shortest Approximate Common Superstring (SACS) problem is : Given a set of strings f={w1, w2, ... , wn}, where no wi is an approximate substring of wj, i ≠ j, find a shortest string Sa, such that, every string of f is an approximate substring of Sa. When the number of the strings n>2, the SACS problem becomes NP-complete. In this paper, we present a greedy approximation SACS algorithm. Our ...

Electrochemical water splitting is regarded as the most promising approach to produce hydrogen. However, sluggish electrochemical reactions occurring at anode and cathode, namely, oxygen evolution reaction (OER) hydrogen (HER), respectively, consume a tremendous amount of energy, seriously hampering its wide application. Recently, single-atom catalysts (SACs) have been proposed effectively enha...