First, because the surface of Fe3O4 NPs was rich in carboxyl, the surface charge of Fe3O4 NPs needed to be changed from negative to positive by PDDA. In a typical synthesis, about 5 mg of the prepared Fe3O4 NPs were dispersed in 15 ml of water and mixed with 5 ml of 1% PDDA solution. Then, the mixture was treated with ultrasonication for 30 min at room temperature. After that, 5 ml of the as-prepared GO was added to the mixture. With another 30 min of ultrasonic treatment, the MG nanocomposites were synthesized with a high yield. Last, the products were washed three times with DI water and ethanol with magnetic separation, respectively. The final precipitate was dispersed in 5 ml of ethanol for further use.

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A worthy mention of Nigerians in Diaspora not registering their presence at our foreign missions   cannot be ignored however Government is culpable in this regard by not doing enough to attract the Nigerians in diaspora to register their contacts, details and occupation or business in foreign land…

Several authors (1, 3) have suggested that a variety of stemmed points in different contexts represent a coastal expansion before 16,000 years ago. This hypothesis is at a nascent stage, rather than [as expressed in (1)] the strongest hypothesis on offer. Stemming is a widespread form of haft design innovated numerous times across multiple continents and is thus not an appropriate derived character on which to base a hypothesis of cultural affiliation. No detailed technological analysis has established empirical validity to connect these disparate assemblages. Proponents have noted (7) that stemmed points, crescents, and shell middens date between 12,200 and 11,400 years ago before the present (cal yr B.P.), about 1000 to 2000 years after widespread Beringian and Clovis sites. Terrestrially oriented subsistence practices are evident across North America several centuries before the appearance of evidence for coastal adaptations. All the well-dated early coastal sites from North America are younger than the earliest Clovis sites. Two early near-coastal sites in South America, Monte Verde and Huaca Prieta (69, 70), have few technological connections with later Paleoindian groups, including the Western Stemmed tradition of western North America.

It’s been a big year for North Texas, especially when it comes to innovation. From industry disruptors, to technological breakthroughs, to groundbreaking advancements, we’ve seen it all in 2018—and we …

In modern times, with more sophisticated synthetic chemistry, the colors became brighter—and in some cases more toxic. Some of the more benign, modern Holi colors, called gulal in Hindi when made in powder form, are a mixture of more than 95% cornstarch blended with food-, drug-, and cosmetic-grade dyes. These pigments, known as FD&C colors in the U.S., are the same ones that bring a rainbow of colors to candy.

The strain of higher prices reflects a global change in sentiment as the United States Federal Reserve — known, not for nothing, as the central bank for the world — steadily lifts interest rates, as it did on Wednesday. Investors have been pulling money out of riskier, developing countries and entrusting it to safer, more established economies like the United States. That has sent the value of currencies plunging from Argentina to Turkey to India, making basic goods more expensive for households and businesses, while amplifying debts.

“We worked closely with the brewer to undertake a number of carefully considered exercises to ensure both the organisation and its workforce are fully prepared.”

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Surface-enhanced Raman scattering (SERS) has been a promising analytical technique for the detection of trace species because of its remarkable advantages, namely, it is sensitive, it is nondestructive, it has a quick response time, and it provides unique information on the species (1–3). Studies on noble metal nanostructures, such as Au, Ag, and Cu, indicate that the tremendous electromagnetic field enhancement at the hotspots greatly increases the sensitivity of SERS (4). However, the SERS effect based on electromagnetic field enhancement has no selectivity for Raman reporters, resulting in complicated signal outputs generated by unexpected interactions (5). Recently, another mechanism, chemical enhancement mechanism (CM), which is related to the formation of charge transfer (CT) states between the adsorbed molecules and the nanoparticles (NPs) (6), has attracted more attention. Compared with SERS, which is based on electromagnetic field mechanism, this unique method always demonstrates high molecule selectivity. Most substrates based on CM show stable and reproducible SERS signals without agglomeration, which is different from those obtained from noble metals. Moreover, the CM-based substrate exhibits good biocompatibility without cytotoxic outcomes. Thus, various new materials have been developed to investigate CT in plasma-free SERS, such as graphite oxide (GO) and semiconductor materials (7). However, only 10 to 100 enhancements have been achieved by these materials (8, 9), limiting their potential applications for reliable quantitative detection in biological and biomedical analysis and diagnosis. Accordingly, low enhancement factor (EF) values prevent further applications of CM-based SERS substrates.

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