Extraction of Al and Na from red mud by magnesium oxide sodium carbonate sinter process

The sintering of Bayer’s process waste residue: Red mud along with magnesium oxide and sodium carbonate is adopted for recovery of aluminum and sodium followed by leaching. This is facilitated by the high temperature reaction of magnesium oxide sodium carbonate and DSP in the red mud to produce an insoluble dimagnesium silicate, magnesium ferrite, magnesium titanate and a soluble sodium aluminate. A variation of the red mud magnesium oxide sodium carbonate sinter process using half the magnesium oxide of existing methods has been investigated. The magnesium to silicon ratio was reduced from 2 to 1 producing a sodium magnesium silicate (Na2Mg2SiO4) rather than the dimagnesium silicate (Mg2SiO4) insoluble phase produced in the existing above sinter method. Synthetic red mud magnesium oxide sodium carbonate sinter products were investigated to understand the phases produced during sintering at varying temperatures and the chemistry of extraction. The target phases and morphological behaviors were seen in XRD and SEM and the highest extractions were produced from a sinter temperature of 900°C for 4 h. A two-stage (105°C / 60 min, 105°C / 240 min) water or caustic leaching process was found to be most effective for extraction. Sodium and aluminum extractions were 99 and 98.7% respectively. The experimental method devised was then used to treat red mud and the target phases were produced. An extraction of sodium and aluminum respectively was achieved. Silicon extractions were below 2%.Key word: Red mud, sinter, leaching, extraction

Depression and quality of life among Afghan healthcare workers: A cross-sectional survey study

Background: According to the World Health Organization, approximately 280 million individuals worldwide suffer from depression. One occupational group that is more prone to mental health issues is healthcare workers (HCWs). However, very little is known about the mental health of HCWs in Afghanistan. Therefore, the present study examined depression, quality of life (QOL), and related factors among Afghan HCWs. Methods: A cross-sectional survey was administered in June 2022 among healthcare workers (N = 299) in the Herat province of Afghanistan. The survey examined depression, its risk factors and predictors among HCWs. Results: Of the 299 participants, 73.6% of them reported depression symptoms. Low monthly income, working in a private hospital, and being a cigarette smoker were some of the main variables associated with depression symptoms among Afghan HCWs. Multiple regression analysis indicated that field of work (aOR = 3.774, p = 0.0048), monthly income (aOR = 0.746, p = 0.0088), job type (aOR = 8.970, p <0.0001), cigarette smoking (aOR = 2.955, p = 0.0069), a bad event happening during the past month (aOR = 2.433, p = 0.0157), physical domain of quality of life (aOR = 0.966, p = 0.0186), and psychological domain of quality of life (aOR = 0.950, p = 0.0005) were significantly associated with depression symptoms. Conclusion: The prevalence of depression symptoms is high among healthcare workers in the Herat province of Afghanistan. One of the variables found to have a major impact on the prevalence of depression was their monthly income. Considering its impact on quality of life and the overall quality of healthcare services, the government should implement regular screening for depression, psychological counselling services, and psychiatric treatment for vulnerable healthcare workers

Depression and self-esteem among Afghan school-going adolescents under the Taliban government: a cross-sectional study

Background: During the period of adolescence, several major developmental changes occur that can have significant impact on an individual’s brain structure and functioning through their entire life. Aims: The present study aimed to examine the association between depression and self-esteem alongside specific sociodemographic factors among school-going adolescents living under the rule of Taliban. Methods: A cross-sectional survey study was conducted with adolescents (n = 452) from 20 randomly selected public primary, secondary and high schools of Herat province (Afghanistan) out of the 86 schools registered in Herat Education Department. The survey included the Center for Epidemiological Studies-Depression Scale (CES-D) and Rosenberg's Self-Esteem Scale (RSES). Results: Two-thirds of adolescents reported depression symptoms (65.3%) and 86.3% reported poor self-esteem. Multiple regression analysis indicated that (i) mother's education level was significantly associated with depression symptoms and (ii) low-income economic status was significantly associated with self-esteem. Conclusion: As well as being one of the few studies in Afghanistan, the present study is one of the very few to assess the association between class group, self-esteem, and depression symptoms. These findings may be used by healthcare authorities and school administrators to raise awareness and implement strategies to facilitate self-esteem among school school-going adolescents

Depression, anxiety and quality of life of Afghan women living in urban areas under the Taliban government: a cross-sectional study

Objectives: According to the World Health Organization, depression is a common mental health illness that is characterised by a persistent feeling of sadness and loss of interest. The present study examined the association of two mental health variables (ie, depression, anxiety) with quality of life (QoL) and the sociodemographic characteristics of Afghan women living in urban areas under the rule of Taliban government in Afghanistan. Design: Cross-sectional study administered between 10 November 2021 to 25 December 2021 among women. Setting: Across major provinces of Afghanistan (Herat, Mazar-e-Sharif, Kabul and Samangan). Measurements: Data were collected using a pretested structured questionnaire. Data entry was carried out using Microsoft Excel 2016. And then exported to IBM SPSS V.26 for Microsoft Windows. Logistic regression models were used to examine the association of depression, anxiety with QoL and sociodemographic characteristics among women (N=438). Results: The prevalence of depression symptoms was 80.4%, and the prevalence of mild to extremely severe anxiety was 81.0%. Depression symptoms among Afghan women were associated with being older, having more children, lower education level, other individuals’ bad behaviour, bad events experienced in the past month, and feeling physically ill. Multiple regression analysis indicated that low monthly household income (adjusted OR, AOR 2.260; 95% CI 1.179 to 4.331, p=0.014) poor physical domain of QoL (AOR 4.436; 95% CI 1.748 to 11.256, p=0.002) and poor psychological domain of QoL (AOR 23.499; 95% CI 7.737 to 71.369, p<0.001) were significantly associated with depression. Conclusion: The prevalence of depression was high among women living under the government of the Taliban in Afghanistan. Considering the high prevalence of depression, anxiety and their impact on QoL and the overall quality of healthcare services, international health organisations should implement programmes for regular screening of depression and anxiety, and there should be psychological counselling services available for vulnerable women living under the government of the Taliban

Atopic dermatitis and indoor use of energy sources in cooking and heating appliances

Background: Atopic dermatitis (AD) prevalence has considerably increased worldwide in recent years. Studying indoor environments is particularly relevant, especially in industrialised countries where many people spend 80% of their time at home, particularly children. This study is aimed to identify the potential association between AD and the energy source (biomass, gas and electricity) used for cooking and domestic heating in a Spanish schoolchildren population. Methods: As part of the ISAAC (International Study of Asthma and Allergies in Childhood) phase III study, a cross-sectional population-based survey was conducted with 21,355 6-to-7-year-old children from 8 Spanish ISAAC centres. AD prevalence, environmental risk factors and the use of domestic heating/cooking devices were assessed using the validated ISAAC questionnaire. Crude and adjusted odds ratios (cOR, aOR) and 95% confidence intervals (CIs) were obtained. A logistic regression analysis was performed (Chi-square test, p-value < 0.05). Results: It was found that the use of biomass systems gave the highest cORs, but only electric cookers showed a significant cOR of 1.14 (95% CI: 1.01-1.27). When the geographical area and the mother’s educational level were included in the logistic model, the obtained aOR values differed moderately from the initial cORs. Electric heating was the only type which obtained a significant aOR (1.13; 95% CI: 1.00-1.27). Finally, the model with all selected confounding variables (sex, BMI, number of siblings, mother’s educational level, smoking habits of parents, truck traffic and geographical area), showed aOR values which were very similar to those obtained in the previous adjusted logistic analysis. None of the results was statistically significant, but the use of electric heating showed an aOR close to significance (1.14; 95% CI: 0.99-1.31). Conclusion: In our study population, no statistically significant associations were found between the type of indoor energy sources used and the presence of AD

Cerebral gene expression in response to single or combined gestational exposure to methylmercury and selenium through the maternal diet

Controversy remains regarding the safety of consuming certain types of seafood, particularly during pregnancy. While seafood is rich in vital nutrients, it may also be an important source of environmental contaminants such as methylmercury (MeHg). Selenium (Se) is one essential element present in seafood, hypothesised to ameliorate MeHg toxicity. The aim of the present study was to ascertain the impact of Se on MeHg-induced cerebral gene expression in a mammalian model. Microarray analysis was performed on brain tissue from 15-day-old mice that had been exposed to MeHg throughout development via the maternal diet. The results from the microarray analysis were validated using qPCR. The exposure groups included: MeHg alone (2.6 mg kg−1), Se alone (1.3 mg kg−1), and MeHg + Se. MeHg was presented in a cysteinate form, and Se as Se–methionine, one of the elemental species occurring naturally in seafood. Eight genes responded to Se exposure alone, five were specific to MeHg, and 63 were regulated under the concurrent exposure of MeHg and Se. Significantly enriched functional classes relating to the immune system and cell adhesion were identified, highlighting potential ameliorating mechanisms of Se on MeHg toxicity. Key developmental genes, such as Wnt3 and Sparcl1, were also identified as putative ameliorative targets. This study, utilising environmentally realistic forms of toxicants, delivered through the natural route of exposure, in association with the power of transcriptomics, highlights significant novel information regarding putative pathways of selenium and MeHg interaction in the mammalian brain

Search for neutral MSSM Higgs bosons decaying to a pair of tau leptons in pp collisions

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Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at √s=8 TeV

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Searches for electroweak production of charginos, neutralinos, and sleptons decaying to leptons and W, Z, and Higgs bosons in pp collisions at 8 TeV

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