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Correction for 'Exploring the properties of Zr2CO2/GaS van der Waals heterostructures for optoelectronic applications' by Altaf Ur Rahman et al., Phys. Chem. Chem. Phys., 2024, https://doi.org/10.1039/D4CP02370F.

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We investigate the structural, electronic, and optical properties of eight possible Zr2CO2/GaS van der Waals (vdW) heterostructures using first-principles calculations based on a hybrid functional. These structures display favorable stability, indicated by matching crystal structures and negative formation energies. In all considered configurations, these heterostructures act as indirect band gap semiconductors with a type-II band alignment, allowing efficient electron-hole separation. Optical studies reveal their suitability for optoelectronic applications. Zr2CO2/GaS under 4% biaxial compressive strain meets the criteria for photocatalytic water splitting, suggesting their potential for electronic and optoelectronic devices in the visible spectrum. Our findings present prospects for advanced photocatalytic materials and optical devices.

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Herein, we present a detailed comparative study of the structural, elastic, electronic, and magnetic properties of a series of new halide perovskite AgCrX3 (X: F, Cl, Br, I) crystal structures using density functional theory, mean-field theory (MFT), and quantum Monte Carlo (MC) simulations. As demonstrated by the negative formation energy and Born-Huang stability criteria, the suggested perovskite compounds show potential stability in the cubic crystal structure. The materials are ductile because the Pugh's ratio is greater than 1.75, and the Cauchy pressure (C12-C44) is positive. The ground state magnetic moments of the compound were calculated as 3.70, 3.91, 3.92, and 3.91 µB for AgCrF3, AgCrCl3, AgCrBr3, and AgCrI3, respectively. The GGA + SOC computed spin-polarized electronic structures reveal ferromagnetism and confirm the metallic character in all of these compounds under consideration. These characteristics are robust under a ±3% strained lattice constant. Using relativistic pseudopotentials, the total energy is calculated, which yields that the single ion anisotropy is 0.004 meV and the z-axis is the hard-axis in the series of AgCrX3 (X: F, Cl, Br, and I) compounds. Further, to explore room-temperature intrinsic ferromagnetism, we considered ferromagnetic and antiferromagnetic interactions of the magnetic ions in the compounds by considering a supercell with 2 × 2 × 2 dimensions. The transition temperature is estimated by two models, namely, MFT and MC simulations. The calculated Curie temperatures using MC simulations are 518.35, 624.30, 517.94, and 497.28 K, with ±5% error for AgCrF3, AgCrCl3, AgCrBr3, and AgCrI3 compounds, respectively. Our results suggest that halide perovskite AgCrX3 compounds are promising materials for spintronic nanodevices at room temperature and provide new recommendations. For the first time, we report results for novel halide perovskite compounds based on Ag and Cr atoms.

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OBJECTIVE: A limited study was found in regards to knowledge, attitudes, and practices (KAP) of traditional and complementary/alternative medicines (TCAM) amongst end-stage renal disease (ESRD) in South East Asian region including Brunei Darussalam. This study explored TCAM use amongst ESRD patients in Brunei Darussalam. METHODS: This was a cross-sectional study in a local Dialysis Centre using a bilingual self-structured questionnaire. Recruitment was done using systematic random sampling with certain inclusion criteria. All collected data were entered into Microsoft Excel 2016, and inferential statistics were carried out using R studio version 1.1.383. RESULTS: About 40.2% were TCAM users, and this was not predictable by any sociodemographic background. Nevertheless, compliance with conventional medicine (CM) was very high (94.1%). Users had a more positive disease perception, which was not affected by length on dialysis treatment or the presence of comorbidities. TCAM was perceived to be less effective and unsafe compared to CM, and patients agreed that its use should be monitored and notified. Health supplement (70.7%) was mainly used to improve general wellness (48.5%) or to relieve fatigue (42.4%), and most practices were influenced by family (43.9%). Only a minority of users (19.5%) reported side effects as majority (80.5%) consumed TCAM and CM separately. CONCLUSIONS: High TCAM practice showed that there are still needs that are not fulfilled. The health care professionals should always remain vigilant of its use and be attentive to attend to patients' needs.

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Background: Myopathy is a disorder of skeletal muscles and has a rare occurrence in pregnancy. It may present with numbness/weakness. The occurrence of isolated weakness involving all the limbs is alarming to the patient and the diagnosis can be challenging to the Obstetrician. We present a case of hypokalaemic paralysis in pregnancy. Case report: A 32-year-old grand multipara presented at 31 weeks gestation with numbness in all limbs for nine days and one-day history of weakness in all limbs. She had a similar episode in her last pregnancy with complete resolution by the end of puerperium. On examination, she was conscious with a Glasgow Coma Scale score was 15/15, had no signs of meningeal irritation, and no cranial nerve palsy. She had normal muscle bulk; the power of 4/5 in both upper limbs and 3/5 in both lower limbs. There was no clearly defined sensory level. Planter reflex was flexor symmetrically. A review of other systems was unremarkable. Her PCV was 35% and random blood glucose was 4.2mmol/l. Serum biochemistry showed severe hypokalaemia of 1.8mmol/l with normal levels of sodium and chloride. Urinary potassium level was normal. She had parenteral correction of potassium with complete resolution of weakness, and she was maintained on oral potassium supplements. She had an uneventful delivery at 37 weeks gestation. Conclusion: Measuring the serum level of potassium should be part of the initial workup when evaluating pregnant women presenting with muscle weakness. Multidisciplinary management leads to early diagnosis, prompt management, and a good prognosis.

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INTRODUCTION: rubella virus usually causes a mild disease, but maternal infection early in pregnancy often leads to birth defects known as congenital rubella syndrome (CRS). Rubella remains poorly controlled in Africa despite being a vaccine preventable disease. The objective of this study was to determine the risk factor of expose of rubella and prevalence of rubella IgG antibodies among pregnant women in Zaria. The results of this study will provide data which may be used to advise the government of Kaduna State on the need to include rubella vaccine in the free routine immunization particularly for women of childbearing age. METHODS: a cross-sectional study was carried out. Pregnant women attending antenatal clinics from three different health facilities in Zaria. A questionnaire was administered, to determine the proportion of pregnant women vaccinated and the sera of these women were tested for rubella IgG antibody using commercially produced enzyme-linked immunosorbent assay (ELISA) Kit. Statistical variables were compared with univariate (frequencies) bivariate (chi- square), multivariate analyses (logistic regression). A p-value of < 0.05 was considered significantly associated at 95% confidence intervals. RESULTS: of the 246 pregnant women screened, 222 (90.2%) were positive for rubella IgG. Prevalence was highest 82/222 (36.9%) among age group 20-24 years. Those positive of those who had completed secondary school education were 104/222 (46.8%) A large number among those who tested positive with 197/222 (88.7%) were married. The Hausa tribe 155/222 (69.9%) had the highest positivity for rubella IgG. Only 2 (0.9%) women claimed to have received rubella vaccine and 159/222 (71.6%) women were seropositive for IgG among the unemployed group. CONCLUSION: the serological evidence of rubella virus is an indication that rubella is endemic in Nigeria. Nigeria should include rubella vaccination in the routine immunization exercise for women before they get pregnant to reduce the risk of CRS.

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INTRODUCTION: Injuries are the second most common cause of disability, the fifth most common cause of healthy years of life lost per 1000 people and unfortunately 90% of mortality takes place in low-to middle-income countries. Trauma registries guide policymakers and health care providers in decision making in terms of resource allocation as well as enhancing trauma care outcomes. Furthermore data from these registries inform policy makers to decrease the rate of death and disability occurring as a result of injuries. We present our experience in setting up an orthopedic trauma registry and the first short term follow-up of radiological outcomes. MATERIALS AND METHODOLOGY: Our study is a non-funded, non-commercial, prospective cohort study that was registered at Research Registry. The primary objectives of our study included assessing pattern of injuries in patients with upper and lower limb skeletal trauma presenting to our tertiary care academic university hospital and their respective outcomes. Data was collected by the musculoskeletal service line team members supervised by an experienced research associate and trauma consultants. The work has been reported in line with the STROCSS criteria. RESULTS: A total of 177 patients were included in this analysis, of whom 101 (57.1%) patients had lower limb fractures, 64(36.1%) patients ad upper limb fractures and 12 (6.8%) patients had both upper and lower limbs involved. A total of 189 upper and lower limb fracture cases were recorded. 176 patients (93.1%) underwent surgeries and 13(6.9%) were managed nonoperatively. Roentgenographic outcomes were assessed using radiological criteria for each bone fractured. CONCLUSION: Establishing a trauma registry assists in identification of the pattern of injuries presenting to the hospital which helps in priority setting, care management and planning. This continuous audit of outcomes in turn, plays a significant role in quality improvement.

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BACKGROUND: In spite of knowledge of the causes and prevention of cervical cancer, screening programs for cervical cancer have not yet been fully implemented in most developing countries including Nigeria. Documented data on the prevalence of preinvasive cervical lesion in pregnancy are scarce in our environment. OBJECTIVES: To determine the prevalence, risk factors, and course of preinvasive cervical lesion in pregnant women attending an antenatal clinic in Ahmadu Bello University Teaching Hospital (ABUTH) Zaria, Northern Nigeria Study Design: This was a cross-sectional longitudinal study. SETTING: The study was conducted in an antenatal clinic of ABUTH Zaria. MATERIALS AND METHODS: A prospective cross-sectional longitudinal analysis was carried out at an Antenatal Clinic of ABUTH Zaria, Nigeria. A total of 250 consecutive pregnant women who fulfilled the inclusion criteria and have given their consent were recruited into the study at the time of their first prenatal (booking clinic) visit for antenatal care. Data from the pregnant women were obtained using a pro forma to evaluate sociodemographic characteristics and risk factors for preinvasive disease. Conventional Papanicolaou smear was taken using the standard procedure. The cytopathologic findings of initial and postpartum Pap smear were documented in the pro forma. Prevalence, persistence, progression, and regression rates of preinvasive diseases were determined. RESULTS: Out of the 250 pregnant women who had cervical cytology by Pap smear during the study, 15 had preinvasive cervical lesion, giving a prevalence rate of 6%; 13 (87%) were low-grade squamous intraepithelial lesion (LGSIL) while 2 (13%) were high-grade squamous intraepithelial lesion (HGSIL). Negative smears were seen in 158 women (63.2%). Inflammatory and other conditions of the cervix which are technically negative smears made up the remaining 30.8%. At postpartum follow-up of the 13 women with LGSIL, 2 (15.4%) became negative while persistence of the disease was observed in 9 (69.2%) of the cases. Two women with LGSIL were lost to follow-up. Of the two women with HGSIL, persistence of the disease was seen in one woman (50%) and regression of the disease was seen in the other woman. Risk factors that were found to be associated with preinvasive cervical lesion were age at coitarche <16 years, number of sexual partners since coitarche, and previous history of sexually transmitted infection and human immunodeficiency virus. Parity, smoking, and use of contraception were found not to be significant risk factors. CONCLUSION: Preinvasive lesion of the cervix is relatively common among antenatal clients in our center. Antenatal clients with HGSIL should have a repeat smear at the end of the puerperium before treatment. Routine Pap smear should be offered to all antenatal clients in our setting.

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