Sabina Yuhas (@Overszabi) and Juliana Belova (@juliewanderz or Oyibo Marlian) are Hungarian and Russian women, respectively, who are fascinated by Nigerian popular culture. Despite their successes in exploiting Black culture to attain wealth and fame in the Nigerian mediasphere, their works have hardly been studied. Close readings and nuanced analyses of their selected TikTok skits show a multiplicity of images that are neither fully European nor Nigerian—equivocal identities—mediating Otherness. However, the longstanding power asymmetries between Africa and Europe characterize their enactments as commodification of Blackness, accounting for why Nigerians who perform “Europeanness” do not attain corresponding success.

Previous research has shown that racial or ethnic prejudice is one of the most influential antecedents of opposition to more expansive immigration policies. In this paper, we explore whether a theoretical perspective derived from the group position model might represent an additional and complementary explanation for immigration attitudes. We also compare how well the prejudice and group position models explain immigration attitudes among both White and Black Americans. Most of the previous work in this literature focuses solely on Whites’ attitudes, and it remains unclear how well models designed with this group in mind might also apply to African Americans. We rely upon the 2004–2005 National Politics Study to explore the power of these models. In general, we find that measures derived from the group position model account for immigration attitudes even after controlling for various forms of out-group prejudice. The pattern of results also differs considerably across the two racial groups in our study.

White and black deposits have been frequently observed on the surface of Korean stone cultural heritages, and they are considered as damage factors in both conservation and esthetic points of view. In order to set up the appropriate conservation remedy, it is important to know their origins, characteristics, and compositions. In this study, optical and scanning electron microscopes (SEMs) equipped with an energy-dispersive spectrometer (EDS) and X-ray diffractometer were employed to determine the white and black deposits. It was found that both deposits consisted mainly of calcium carbonate (calcite) and calcium sulfate (gypsum). The calcite and gypsum were characterized by bladed, rhombohedral, tabular, and amorphous morphologies under a SEM. The black deposit was not only composed of calcite or gypsum, but also accompanied amorphous and irregular matrix. SEM-EDS analysis revealed an abundance of silicon, aluminum, iron, phosphorus, and carbon on the matrix, which were major elements of soil, atmospheric deposits, and organisms. The white deposit, on the other hand, barely contained those coloring substances. These salts and deposited substances were caused by chemical reaction and physical adhesion between rock-forming minerals, lime mortar, sulfur in polluted air environment, soil dust, and microorganisms.

Organic light-emitting diodes (OLEDs) are developing into a competitive alternative to conventional light sources. Nevertheless, OLEDs need further improvement in terms of efficiency and color rendering for lighting applications. Fluorescent blue emitters allow deep blue emission and high stability, while phosphorescent blue emitter still suffer from insufficient stability. The concept of triplet harvesting is the key for achieving internal quantum efficiencies up to 100 % and simultaneously benefiting from the advantages of fluorescent blue emitters. Here, we present a stacked OLED consisting of two units comprising four different emitters in total. The first unit takes advantage of the concept of triplet harvesting and combines the light emission of a fluorescent blue and a phosphorescent red emitter. The second unit emits light from a single emission layer consisting of a matrix doped with phosphorescent green and yellow emitters. With this approach, we reach white color coordinates close to the standard illuminant A and a color rendering index of above 75. The presented devices are characterized by high luminous efficacies of above 30 lm/W on standard glass substrates without outcoupling enhancement.

27 Creole and 27 Plymouth Rock×Rhode Island Red hens (cross) 47 months old were used to estimate the effect of three diets; commercial diet, corn+alfalfa and homemade diet on egg weight, white, yolk, egg shell, dry matter, protein, fat and ash content of the yolk; lipid fraction and fatty acid profile of the yolk was estimated too. Eggs were collected at 53 weeks of age, 30 eggs per treatment were randomly selected for laboratory analysis. No differences (P>0.05) were found on egg, white, yolk and egg shell weight between genetic groups; inside groups there was a significant effect of diet on yolk weight in both groups. There was no effect of diet and genetic group on yolk composition (P>0.05); however there was a trend of less content of dry matter and more ash with the homemade diet in both groups. There was a group effect (P<0.05) on cholesterol, cholesterol esters and lecithin content; inside groups there was a diet effect (P<0.05) on total lipid content and triglycerides. No differences (P>0.05) between groups were found for the fatty acid profile; inside groups stearic acid was higher (P<0.05) in the yolk of hens fed with no commercial diet and linoleic acid percentage was higher (P<0.05) with corn plus alfalfa diet. Results indicated that corn+alfalfa and homemade diet seem to alter the egg components, yolk lipids and fatty acid profile.

Four consistent stock brand names of white egg shell laying fowl were compared with four such stocks laying brown shelled eggs. Data were derived from the Combined Summaries of European Random Sample Egg Production Tests (ERSEPT) 1979-1992 and from the North Carolina Layer Performance and Management Test (NCLPMT) 1984-1992. In the former, laying performance was recorded from 141 to 500 days of age and the data were based on annual means derived from about six testing stations, while the latter involved one testing station with recording over two cycles of production from 140 to 434 days and from 435 to 728 days (which included a moult). Although identical stocks were not available in both continents, results for egg mass show a similar initial superiority for the white egg shell stocks. This advantage decreased over the years and changed to an advantage for the brown egg stocks of about 0.5 kg in the ERSEPT and 1.1 and 0.7 kg, respectively, in the first and second cycles of the NCLPMT. In the ERSEPT the white egg stock advantage in terms of feed to egg mass ratio decreased. This can be attributed to greater genetic gains by the brown egg stocks whose final body weight declined (from 510 g to 270 g above that of the white egg stocks); increased mean egg weight (with the gap between the stock types widening from 2.3 to 3.3 g); and to some extent, earlier sexual maturity, as indicated by decreased age at 50% production. Results of the NCLPMT also show that the improved egg mass for the brown egg stocks was achieved by closing the gap in hen-housed production (20 eggs per bird) while maintaining an egg weight superiority of 3.4 g. The improvement in performance was particularly evident in the first production cycle. In the second cycle the brown egg stocks showed higher mortality rates, together with increased food consumption and a smaller egg size advantage. In both production cycles the brown egg stocks were characterized by much higher levels of meat spots.