Tree-ring cellulose is a commonly used material for radiocarbon analysis. Extracting cellulose is labor-consuming and several devices that enable batchwise extraction have been developed. However, these devices bear the risk of sample contamination. The present study describes a new device which improves upon two aspects of currently available devices. First, to prevent cross-sample-contamination, we redesigned the drainage module to enable independent removal of chemical waste from each individual sample funnel. Second, we added covers to the sample funnels to reduce the risk of external contamination. Cellulose purity (i.e., holocellulose) was confirmed by Fourier Transform Infrared (FTIR) Spectroscopy. Furthermore, accuracy of the radiocarbon analysis was confirmed by results of 14C-blank samples and samples of known age. In conclusion, while maintaining labor-saving, our modified device significantly reduces the risk of sample contamination during extraction of tree-ring cellulose.

We compared the effects of two waste-based culture media (M1 and M2) on the technological properties of Lacticaseibacillus paracasei 90 (L90) for its application as a secondary culture in Cremoso cheese. The following parameters were studied at different ripening times: pH (7, 20, and 40 d), microbiological counts, carbohydrates and organic acids (7 and 40 d), moisture, fat, protein and volatile compounds (40 d). The viability and the metabolic performance of the strain in cheeses were also verified along ripening. Lactobacilli counts in experimental cheeses manufactured with L90 were ~8 log CFU/g at 40 d, meanwhile adventitious lactobacilli reached ~4 log CFU/g in the control cheese (made without L90). The levels of lactic acid, citric acid and pyruvic acid were similar among cheeses at 40 d, reaching levels of ~1433 mg/100 g, ~172 mg/100 g, and 7 mg/100 g, respectively. However, the concentration of lactic acid showed numerical differences between experimental and control cheeses. The cheeses made with the adjunct culture showed lower residual galactose (< 588 mg/100 g) in comparison with the control cheese (836 mg/100 g), highlighting the potential of L90 to play a bioprotective role. In the same vein, orotic and hippuric acids were metabolized at different degrees in cheeses made with L90, reaching levels of < 3.7 mg/100 g and < detection limit, respectively, at 40 d. In general, volatile compounds profiles were not negatively affected by the culture media used. On the contrary, the production of key aroma compounds (diacetyl and acetoin) was positively affected by the growth of L90 in these alternative media. The results demonstrated that the L90 strain could be used as an adjunct culture in Cremoso cheese, regardless of the culture media employed for its growth.

This is the latest judgment in a case filed in 2020 by the state of Missouri against several named defendants and the Chinese Communist Party (CCP) for allegedly allowing COVID-19 to spread, engaging in a coverup of the virus, and hoarding PPE, such as high-quality masks, which caused the virus to spread further. In July 2022, the Eastern District of Missouri dismissed the complaint, finding that the Foreign Sovereign Immunities Act (FSIA) applied to all the defendants in the case, including the CCP and that neither the commercial activity exception or the noncommercial torts exception applied. The Court of Appeals affirmed, barring one difference. The Court of Appeals agreed with the lower court that the FSIA applied to all the defendants and that neither exception raised applied. However, it reversed the lower court's dismissal of the PPE hoarding claim, finding that that the taking over of “mask-producing factories and buying up a substantial portion of the world's supply of personal-protective equipment” was commercial in nature.

In 2023, Claudia Goldin received the Nobel Prize for her groundbreaking research in economics. In this article, I use Goldin’s research to reflect on the role of history of education in academic research. I argue that Goldin’s remarkable achievement underscores the need for historians of education to reach a wider disciplinary audience in the humanities and social sciences. Goldin’s success lies not in isolating her focus to a subfield, but in connecting historical research to wider concerns in the discipline of economics. Goldin’s research thus reminds us of the skills required of historians of education: to understand the research interest and terminology of other research fields, and to use historical methods to address the key problems that those research fields explore. That is, we need to learn how to apply historical methods to what are essentially nonhistorical problems.

An attempt was made to develop a novel dairy-based dip-like product from heat-acid-induced milk gel and whey. Based upon preliminary trials, the combination of cream (15–35%), whey (60–70%) and common salt (0.8–1.0%, all three as weight of heat-acid-induced milk gel) was selected for optimization of the dairy dip through factorial design of response surface methodology (RSM). Addition of glycerol monostearate, trisodium citrate and sodium hexametaphosphate each at the rate of 0.3% (as weight of heat-acid-induced milk gel) in the formulation was previously standardized. The optimization was carried out by analysing the textural and sensorial parameters of the dairy-based dip. The sensorial parameters (flavour, body and texture, colour and appearance and overall acceptability) and textural parameters (firmness, stickiness, work of shear and work of adhesion) were significantly (P < 0.05) correlated with the ingredient formulation. RSM analysis suggested the use of cream, whey and common salt at amounts of 27.92, 60.26 and 0.8% of the weight of heat-acid-induced milk gel for preparing dairy-based dip with a desirability of 0.84. The formulated product contained a lower fat but higher protein and lactose content than cheese dip.

On May 15, 1972, the Cuban leader Fidel Castro and Algeria’s President Houari Boumedienne arrived in the workers’ town of El Hadjar, near Annaba, to celebrate what appeared to be postcolonial Algeria’s most important economic achievement. In a festive atmosphere, Castro cut the ribbon inaugurating a powerful blast furnace constructed by the Soviet Union and a rolling mill made by the Italian firm Innocenti in the steel plant of El Hadjar.1 Promised by the French colonial state, but built step by step after Algeria’s independence by the government of the Algerian Liberation Front (Front de Libération Nationale; FLN), the El Hadjar steel plant was the heavy industry the country hoped would spur its industrialization, much like the heavy industry that once constituted the cornerstone of industrialization in Stalin’s Soviet Union. The Soviet Union was a major source of inspiration for Algeria; it also was a key provider of technology, training, and further technical assistance. Reporting on El Hadjar’s opening ceremony, the French newspaper, Le Monde, did not fail to observe that, “The Algerian government entrusted the USSR to expand the plant, increasing its production capacity [from 400,000] to nearly 1.5 million tons [per year] in 1977.”2