Electrical Control of Valley Polarized Charged Exciton Species in Monolayer WS2.

Excitons are key to the optoelectronic applications of van der Waals semiconductors, with the potential for versatile on-demand tuning of properties. Yet, their electrical manipulation remains challenging due to inherent charge neutrality and the additional loss channels induced by electrical doping. We demonstrate the dynamic electrical control of valley polarization in charged excitonic states of monolayer tungsten disulfide, achieving up to a 6-fold increase in the degree of circular polarization under off-resonant excitation. In contrast to the weak direct tuning of excitons typically observed using electrical gating, the charged exciton photoluminescence remains stable, even with increased scattering from electron doping. By exciting at the exciton resonances, we observed the reproducible nonmonotonic switching of the charged state population as the electron doping is varied under gate bias, indicating a resonant interplay between neutral and charged exciton states.

Liquid Metal Oxide-Assisted Integration of High-k Dielectrics and Metal Contacts for Two-Dimensional Electronics.

Two-dimensional van der Waals semiconductors are promising for future nanoelectronics. However, integrating high-k gate dielectrics for device applications is challenging as the inert van der Waals material surfaces hinder uniform dielectric growth. Here, we report a liquid metal oxide-assisted approach to integrate ultrathin, high-k HfO2 dielectric on 2D semiconductors with atomically smooth interfaces. Using this approach, we fabricated 2D WS2 top-gated transistors with subthreshold swings down to 74.5 mV/dec, gate leakage current density below 10-6 A/cm2, and negligible hysteresis. We further demonstrate a one-step van der Waals integration of contacts and dielectrics on graphene. This can offer a scalable approach toward integrating entire prefabricated device stack arrays with 2D materials. Our work provides a scalable solution to address the crucial dielectric engineering challenge for 2D semiconductor-based electronics.

Cultural practices and beliefs followed for new born care in Santhal pargana - A cross sectional study.

Introduction: Newborn care practices and beliefs vary word-wide, country to country and region to region. These care practices play a vital role in morbidity and mortality of newborn. A descriptive cross-sectional study was conducted to assess the newborn care practices and beliefs of newborn care. Methods: Data was collected from 429 post-natal mothers, who delivered in selected government hospitals of Santhal parganas, Deoghar, Jharkhand. Convenience sampling technique was used to collect the data from February 2023 to April 2023. Results: Findings of the study are, 86.9% mothers accepted that they massage the baby with oil before bath, 89.3% participants have given breastfeeding within one hour of delivery, 93.7% have given prelacteal feeds to the newborn. Applying Heeng (Asafoetida) over the umbilicus was found a common practice to cure the abdominal pain, 70.8% accepted that they apply ashes or powder or cow dung on the umbilical cord, and 88.3% rub the dough on baby's skin to remove excess hairs, 99.3% mothers had firm belief that hot and cold foods in their diet could harm the baby. In continuation 98.8% believed that tooth eruption is associated with diarrhoea, 95.6% are applying kajal in the eyes of new born. Majority 98.8% believed that baby's skin should be exposed to sunlight in case of jaundice and 94% avoid dressing of new born with yellow clothes. Conclusion: Continuous Health Education programs must be organized in Community to Educate the people about beneficial and harmful newborn care practices, which will help to reduce morbidity and mortality in newborn.

Elucidating the bacterial inactivation mechanism by argon cold atmospheric pressure plasma jet through spectroscopic and imaging techniques.

AIMS: This study aims to assess the potential bacterial inactivation pathway triggered by argon (Ar) cold atmospheric pressure plasma jet (CAPJ) discharge using spectroscopic and imaging techniques. METHODS AND RESULTS: Electrical and reactive species of the Ar CAPJ discharge was characterized. The chemical composition and morphology of bacteria pre- and post-CAPJ exposure were assessed using Fourier transform infrared (FTIR), Raman micro-spectroscopy, and transmission electron microscopy (TEM). A greater than 6 log reduction of Escherichia coli and Staphylococcus aureus was achieved within 60 and 120 s of CAPJ exposure, respectively. Extremely low D-values (<20 s) were recorded for both the isolates. The alterations in the FTIR spectra and Raman micro-spectra signals of post-CAPJ exposed bacteria revealed the degree of destruction at the molecular level, such as lipid peroxidation, protein oxidation, bond breakages, etc. Further, TEM images of exposed bacteria indicated the incurred damages on cell morphology by CAPJ reactive species. Also, the inactivation process varied for both isolates, as evidenced by the correlation between the inactivation curve and FTIR spectra. It was observed that the identified gas-phase reactive species, such as Ar I, O I, OH•, NO+, OH+, NO2-, NO3-, etc. played a significant role in bacterial inactivation. CONCLUSIONS: This study clearly demonstrated the effect of CAPJ exposure on bacterial cell morphology and molecular composition, illuminating potential bacterial inactivation mechanisms.

Nanoironing van der Waals Heterostructures toward Electrically Controlled Quantum Dots.

Assembling two-dimensional van der Waals (vdW)-layered materials into heterostructures is an exciting development that sparked the discovery of rich correlated electronic phenomena. vdW heterostructures also offer possibilities for designer device applications in areas such as optoelectronics, valley- and spintronics, and quantum technology. However, realizing the full potential of these heterostructures requires interfaces with exceptionally low disorder which is challenging to engineer. Here, we show that thermal scanning probes can be used to create pristine interfaces in vdW heterostructures. Our approach is compatible at both the material- and device levels, and monolayer WS2 transistors show up to an order of magnitude improvement in electrical performance from this technique. We also demonstrate vdW heterostructures with low interface disorder enabling the electrical formation and control of quantum dots that can be tuned from macroscopic current flow to the single-electron tunneling regime.

Vaccine and malnutrition: A narrative review.

Nearly 45% of under 5 mortality is directly or indirectly linked to malnutrition. Infection adds to the increased mortality and morbidity in these groups. Vaccination is very important in these undernourished children protecting against life-threatening infections. The goal of vaccination is to produce long-term protection by generating memory cells and the generation of antibodies. Since malnutrition is a state of immunodeficiency, the immune response to vaccines in these children is a matter of concern. We did an exhaustive search to gather more recent studies and corroborated previous findings. Oral Polio Vaccine (OPV), Pneumococcal Polysaccharide Vaccine, Haemophilus influenza vaccine, rabies, and cholera vaccine showed normal response to immunization. Measles and rotavirus vaccines were found to elicit lower seroprotection and lower efficacy in undernourished children. Data regarding response to vaccination against BCG, DPwT, Hepatitis B, pneumococcal conjugate vaccine, and meningococcal vaccine was inconclusive. Although most of the studies show a normal immune response to different vaccines, excluding other confounding factors and effect modifiers had not been easy to interpret. However, with the advances in the understanding of vaccine physiology with newer immunological techniques, good-quality studies might explore the gray areas that remain untouched.

Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS2/WSe2 heterobilayer.

Excitonic states trapped in harmonic moiré wells of twisted heterobilayers is an intriguing testbed for exploring many-body physics. However, the moiré potential is primarily governed by the twist angle, and its dynamic tuning remains a challenge. Here we demonstrate anharmonic tuning of moiré potential in a WS2/WSe2 heterobilayer through gate voltage and optical power. A gate voltage can result in a local in-plane perturbing field with odd parity around the high-symmetry points. This allows us to simultaneously observe the first (linear) and second (parabolic) order Stark shift for the ground state and first excited state, respectively, of the moiré trapped exciton - an effect opposite to conventional quantum-confined Stark shift. Depending on the degree of confinement, these excitons exhibit up to twenty-fold gate-tunability in the lifetime (100 to 5 ns). Also, exciton localization dependent dipolar repulsion leads to an optical power-induced blueshift of ~ 1 meV/µW - a five-fold enhancement over previous reports.

Bradycardia after pulse methylprednisolone therapy in a child-Uncommon side effect of a frequently used drug: A case report.

Corticosteroids are potent anti-inflammatory agents used as a mainstay of therapy in most of the rheumatologic disorders. Common side effects of pulse steroid therapy include hypertension, hyperglycemia, seizure, hypokalemia, and infection. We report a case of an 11-year-old girl with polyarticular Juvenile idiopathic arthritis who developed bradycardia following pulse methylprednisolone therapy. On day 2 of methylprednisolone infusion, she developed bradycardia with a heart rate between 50 and 60/min. ECG was suggestive of sinus bradycardia. There was no evidence of dyselectrolytemia (Na-141 mmol/l, K-3.54 mmol/l, Ca-8.72 mg/l) or sepsis. The patient did not receive methylprednisolone on day 3 and vitals continued to be monitored. Her heart rate improved after 12 hours. In the mid of infusion on day 4, again the patient had bradycardia with a heart rate of 50-60/minute. Since she was hemodynamically stable, we continued the infusion, and bradycardia resolved in the next 8 hours. On follow-up after 2 weeks, she had some improvement in joint symptoms and normal heart rate. As per Naranjo adverse drug reaction probability scale, the adverse reaction in our case was probable with a score of 8. Although bradycardia associated with pulse steroid therapy is benign and is usually reversible following cessation of therapy, a baseline heart rate, ECG, and electrolyte level are suggested before infusion as a cautionary measure to minimize serious adverse events.

Dyslipidemia Among Overweight and Obese Children in Jharkhand: A Hospital-Based Study.

OBJECTIVE: To study the prevalence of common dyslipidemia among overweight and obese children between 2-18 years in a tribal region. METHODS: This cross-sectional study was carried out in 151 overweight and obese children aged 2-18 years, who visited the pediatric outpatient department of a tertiary care hospital in Jharkhand between 1 August and 30 November, 2022. Dyslipidemia was defined as anyone of the following: a total cholesterol level of 240 mg/dL, a triglyceride level of 150 mg/dL, a low-density lipoprotein cholesterol level (LDL-C) of 140 mg/dL, a high-density lipoprotein cholesterol level (HDL-C) of 40 mg/dL, or the use of a lipid-lowering drug [8]. Overweight and obesity were defined as per World Health Organization criteria. RESULTS: The prevalence of dyslipidemia was 63.6%. The most common type of dyslipidemia was low HDL-C + high TG levels found in 32.5% (n=49) children. The most prevalent pattern of dyslipidemia in overweight children was low HDL-C (19, 32.3%); and in obese children low HDL-C and high TG levels (39, 42.3%). CONCLUSION: The prevalence rate of dyslipidemia was high among overweight and obese children in this region. There was a positive association between dyslipidemia and body mass index.

Dielectrics for Two-Dimensional Transition-Metal Dichalcogenide Applications.

Despite over a decade of intense research efforts, the full potential of two-dimensional transition-metal dichalcogenides continues to be limited by major challenges. The lack of compatible and scalable dielectric materials and integration techniques restrict device performances and their commercial applications. Conventional dielectric integration techniques for bulk semiconductors are difficult to adapt for atomically thin two-dimensional materials. This review provides a brief introduction into various common and emerging dielectric synthesis and integration techniques and discusses their applicability for 2D transition metal dichalcogenides. Dielectric integration for various applications is reviewed in subsequent sections including nanoelectronics, optoelectronics, flexible electronics, valleytronics, biosensing, quantum information processing, and quantum sensing. For each application, we introduce basic device working principles, discuss the specific dielectric requirements, review current progress, present key challenges, and offer insights into future prospects and opportunities.

Liquid-Metal-Printed Ultrathin Oxides for Atomically Smooth 2D Material Heterostructures.

Two-dimensional (2D) semiconductors are promising channel materials for continued downscaling of complementary metal-oxide-semiconductor (CMOS) logic circuits. However, their full potential continues to be limited by a lack of scalable high-k dielectrics that can achieve atomically smooth interfaces, small equivalent oxide thicknesses (EOTs), excellent gate control, and low leakage currents. Here, large-area liquid-metal-printed ultrathin Ga2O3 dielectrics for 2D electronics and optoelectronics are reported. The atomically smooth Ga2O3/WS2 interfaces enabled by the conformal nature of liquid metal printing are directly visualized. Atomic layer deposition compatibility with high-k Ga2O3/HfO2 top-gate dielectric stacks on a chemical-vapor-deposition-grown monolayer WS2 is demonstrated, achieving EOTs of ∼1 nm and subthreshold swings down to 84.9 mV/dec. Gate leakage currents are well within requirements for ultrascaled low-power logic circuits. These results show that liquid-metal-printed oxides can bridge a crucial gap in dielectric integration of 2D materials for next-generation nanoelectronics.

Science of malaria elimination: using knowledge of bottlenecks and enablers from the Malaria Elimination Demonstration Project in Central India for eliminating malaria in the Asia Pacific region.

Malaria poses a major public health challenge in the Asia Pacific. Malaria Elimination Demonstration Project was conducted as a public-private partnership initiative in Mandla between State government, ICMR, and FDEC India. The project employed controls for efficient operational and management decisions. IEC campaigns found crucial in schools and communities. Capacity building of local workers emphasized for better diagnosis and treatment. SOCH mobile app launched for complete digitalization. Better supervision for Indoor Residual Sprays and optimized Long Lasting Insecticidal Nets distribution. Significant malaria cases reduction in Mandla. Insights from MEDP crucial for malaria elimination strategies in other endemic regions of the Asia Pacific.

Highly Nonlinear Biexcitonic Photocurrent from Ultrafast Interlayer Charge Transfer.

Strong Coulomb interactions in monolayer semiconductors allow them to host optically active large many-body states, such as the five-particle state, charged biexciton. Strong nonlinear light absorption by the charged biexciton under spectral resonance, coupled with its charged nature, makes it intriguing for nonlinear photodetection─an area that is hitherto unexplored. Using the high built-in vertical electric field in an asymmetrically designed few-layer graphene encapsulated 1L-WS2 heterostructure, here we report a large, highly nonlinear photocurrent arising from the strong absorption by two charged biexciton species under zero external bias (self-powered mode). Time-resolved measurement reveals that the generated charged biexcitons transfer to the few-layer graphene in a time scale of sub-5 ps, indicating an ultrafast intrinsic limit of the photoresponse. By using single- and two-color photoluminescence excitation spectroscopy, we show that the two biexcitonic peaks originate from bright-dark and bright-bright exciton-trion combinations. Such innate nonlinearity in the photocurrent due to its biexcitonic origin, coupled with the ultrafast response due to swift interlayer charge transfer, exemplifies the promise of manipulating many-body effects in monolayers toward viable optoelectronic applications.

Sustaining progress towards malaria elimination by 2025: Lessons from Bhutan & Timor-Leste.

In Asia Pacific, several nations that were part of the World Health Organization's initiative to eliminate malaria by 2020 or the E2020 Initiative reported being off-track. The COVID-19 pandemic further strained health systems and has the potential to stall the efforts and reverse earlier progress made towards the fight against malaria. These nations have since recommitted to eliminating malaria by 2025, in a renewed E2025 Initiative. This viewpoint presents efforts of the national malaria programs in Bhutan and Timor-Leste as they prepare for this new commitment. It includes insights on the approaches adapted by both countries that have helped them keep the spotlight on malaria whilst preventing large COVID-19 outbreaks. This viewpoint proposes key strategies that near-elimination countries can consider to sustain malaria interventions and realize their elimination goal. Of note, it calls for national strategic plans to consider a whole-of-government approach to ensure progress - which includes sustaining political commitment, systematically collaborating across borders, empowering communities and strengthening health systems particularly through surveillance and data management - that will benefit all existing and future infectious threats and pave the way for integrated response mechanisms across diseases.