Publications by authors named "Ajeet K Singh"

Zero-dose children pose a key challenge in immunization programs due to their association with access to the health system and primary healthcare services. Examining zero-dose aids an in-depth understanding of healthcare disparities among children and caregivers. The disparity in utilization of maternal and child health services raises concerns about the potential consequences of unintended pregnancies on vaccine uptake.

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  • The increasing need for carbon-neutral energy sources drives research into new methods for storing solar energy as chemical bonds, with artificial photosynthesis emerging as a key solution using water (H2O).
  • The main challenge in artificial photosynthesis is the four-electron oxidation of water, creating a bottleneck that hampers sustainable energy production, necessitating the development of effective catalysts.
  • This review highlights advancements in water oxidation catalysts (WOCs), addressing the importance of both biological inspiration and innovative chemical approaches, while also discussing the limitations and potential improvements through hybrid catalyst designs.
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Child immunization is crucial for reducing the morbidity and mortality associated with vaccine-preventable diseases (VPDs). The program grew over the years, however, progress towards full immunization coverage (FIC) remained slow, with only 44% of children fully immunized in 1992-1993, and 62% in 2015-2016, as reported in the National Family Health Survey. To address this challenge, Government of India launched Routine Immunization intensification drive- Mission Indradhanush (MI) in 2014, with the aim of achieving 90% FIC.

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  • The COVID-19 pandemic significantly disrupted healthcare systems worldwide, especially in India, where routine immunization programs faced challenges due to lockdowns and healthcare worker shortages.
  • India's response involved implementing one of the largest COVID-19 vaccination campaigns while revitalizing its Universal Immunization Program (UIP), which helped improve immunization coverage and reduce the number of zero-dose children.
  • The paper highlights India’s effective strategies and resilience in managing both COVID-19 and routine immunizations, showcasing how strong political commitment, infrastructure, and a skilled workforce are vital for overcoming health crises and enhancing public health.
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Public health programmes are interlinked and intertwined with communication, advocacy and social mobilisation for their success. The unprecedented situation created by COVID-19 brought a medical emergency all over the world, the like of which was probably not seen after the Spanish Flu outbreak, a century ago. First there seemed no solution in sight when tens of thousands of people lost their lives to the coronavirus in various countries, but when the vaccine arrived, there were, in general, doubts about its efficacy and safety.

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Rotavirus is one of the leading causes of diarrhea in infants and young children worldwide. In this study, we investigated the impact of rotavirus vaccination on the prevalence of diarrheal disease among children under five years of age in India. Research on the impact of the rotavirus vaccine on reducing diarrheal disease is therefore important in contributing to the growing body of evidence on the effectiveness of this intervention in improving child health outcomes.

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In this work, 1,8-naphthalimide (NMI)-conjugated three hybrid dipeptides constituted of a β-amino acid and an α-amino acid have been designed, synthesized, and purified. Here, in the design, the chirality of the α-amino acid was varied to study the effect of molecular chirality on the supramolecular assembly. Self-assembly and gelation of three NMI conjugates were studied in mixed solvent systems [water and dimethyl sulphoxide (DMSO)].

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The dropout rate is one of the determinants of immunization coverage and program performance, program continuity, and follow-up. The dropout rate refers to the proportion of vaccine recipients who did not finish their vaccination schedules, and it is determined by comparing the number of infants who started the schedule to the number who completed it. It is the rate difference between the first and final dosage or the rate difference between the first vaccination and the last vaccine dropout; thus, it denotes that the first recommended dose of vaccine was received, but that the subsequently recommended dose was missed.

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Molecules with solid state luminescence and mechanochromic luminescence properties have attracted immense interest owing to their potential application in the areas of organic field-effect transistors (OFETs), organic light-emitting diodes (OLEDs), optoelectronic devices, fluorescence switches, mechano-sensors and data storage. Herein we report a convenient two step synthetic protocol to obtain a couple of luminescent molecules. Using these, a comparative study has been performed to showcase the importance of the weak π⋯π interactions to observe the aggregation induced emission (AIE) and solid-state mechanochromic luminescence.

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  • This study explores the complex interactions and assembly processes in supramolecular copolymerization of two chiral dipolar naphthalene monoimide (NMI) building blocks, one containing oxygen and the other sulfur.
  • The polymerization processes differ significantly; one pathway leads to diverse structures like nanotapes and helical fibers due to competing dipolar interactions and hydrogen bonding, while the other forms stable spherical assemblies dominated by stronger hydrogen bonds.
  • The research also reveals two main approaches to copolymerization, one driven by thermodynamics creating a chiral copolymer from a spherical structure and the other kinetically controlled through sequence-specific addition of monomers, resulting in unique core-multiarmed star copolymers that display adjustable arm
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The power conversion efficiency of all-inorganic SbS-on-Si two-terminal (2-T) monolithically integrated and four-terminal (4-T) mechanically stacked tandem solar cells are investigated. A one-dimensional solar cell capacitance simulator (SCAPS-1D) has been used to simulate the stand-alone antimony trisulfide (SbS) top sub-cell, silicon (Si) bottom sub-cell, 2-T monolithic, and 4-T mechanically stacked tandem solar cells. The stand-alone sub-cells are optimized by extensive studies, including interface defects density, bulk defects density, absorber layer thickness, and series resistance.

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Helical supramolecular architectures play important structural and functional roles in biological systems. The helicity of synthetic molecules can be tuned mainly by the chiral manipulation of the system. However, tuning of helicity by the achiral unit of the molecules is less studied.

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A new hetero-structure of n-TiO/p-WS/p-CuO is proposed as a potential candidate for solar energy generation using tungsten disulfide (WS) as an absorber layer. The proposed device performance is simulated by employing a one-dimensional solar cell capacitance simulator (SCAPS-1D). The numerical simulation studies compared the performances of n-TiO/p-CuO, n-TiO/p-WS/p-CuO, and n-TiO/p-WS hetero-structures based on various physical parameters like interface defects density, bulk defects density, absorber layer thickness, series resistance, shunt resistance, and operating temperature.

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Our paper examines the key determinants of COVID-19 vaccination coverage in India and presents an analytical framework to probe whether vaccine hesitancy, socioeconomic factors and multi-dimensional deprivations (MPI) play a role in determining COVID-19 vaccination uptake. Our exploratory analysis reveals that COVID-19 vaccine hesitancy has a negative and statistically significant impact on COVID-19 vaccination coverage. A percentage increase in vaccine hesitancy can lead to a decline in vaccination coverage by 30 percent.

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Multivesicular liposomes (MVLs) are non-concentric, lipid-based micron-sized spherical particles. The usage of MVL for sustained drug delivery has seen progression over the last decade due to successful clinical and commercial applications. It provides attractive characteristics, such as high encapsulation efficiency, variety of sizes, structural stability, and different choices for the route of administration.

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  • Reactive oxygen species (ROS) play a crucial role in pain mechanisms, with sources mainly being mitochondria and plasma membranes, particularly through NADPH oxidase (NOX) isozymes NOX1, NOX2, and NOX4, which contribute to pain sensitization.
  • The study explored the effectiveness of a new specific NOX1 inhibitor, ML171, in reducing pain in a formalin-induced inflammatory pain model, showing a decrease in pain behaviors and associated biochemical changes in the spinal cord and dorsal root ganglion.
  • ML171 not only reduced pain response but also altered NOX activity and the ERK1/2 signaling pathway, highlighting its potential as a novel therapeutic approach for pain management through targeted inhibition
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Introduction: Pain is an unpleasant sensation triggered by noxious stimulation. It is one of the most prevalent conditions, limiting productivity and diminishing quality of life. Non steroidal anti inflammatory drugs (NSAIDs) are widely used as pain relievers in present day practice as pain is mostly initiated due to inflammation.

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Concomitant generation of reactive oxygen species during tissue inflammation has been recognised as a major factor for the development and the maintenance of hyperalgesia, out of which HO is the major player. However, molecular mechanism of HO induced hyperalgesia is still obscure. The aim of present study is to analyse the mechanism of HO-induced hyperalgesia in rats.

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Objectives: Impact of ROS in development of hyperalgesia has recently motivated scientists to focus on ROS as novel target of anti-hyperalgesic interventions. However, role of ROS in molecular signaling of hyperalgesia is still poorly understood. The present study is aimed to analyze the effect of dietary antioxidant resveratrol on antioxidant defense system, ROS level and TNFR1-ERK signaling pathway during early and late phase of inflammatory hyperalgesia.

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Sensitization of nociceptive neurons by inflammatory mediators leads to hypersensitivity for normal painful stimuli which is termed hyperalgesia. Oxidative stress is an essential factor in pathological pain; therefore, antioxidants qualify as potential anti-hyperalgesic agents. The present study examines the efficacy of the natural antioxidant resveratrol in complete Freund's adjuvant (CFA) induced hyperalgesic rats.

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Reactive oxygen species are signaling mediators of nociceptive pathways. Exogenous administrations of antioxidants show anti-hyperalgesic effect. However, very little is known about the role of endogenous antioxidant defense system in pain pathology.

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In the present work, concomitant use of self-microemulsifying drug delivery systems (SMEDDS) and a novel third-generation P-gp inhibitor, GF120918 (elacridar), for the effective transport of taxanes (paclitaxel and docetaxel) across an in vitro model of the intestinal epithelium and uptake into tumor cells were investigated. On the basis of solubility studies and ternary phase diagrams, different SMEDDS formulations of taxanes were prepared and characterized. In caco-2 cell permeation study, paclitaxel-loaded SMEDDS along with GF120918 showed a four-fold increase in apparent permeability, while docetaxel-loaded SMEDDS in combination with GF120918 showed a nine-fold increase in permeability, as compared to plain drug solution.

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Limited aqueous solubility of exemestane leads to high variability in absorption after oral administration. To improve the solubility and bioavailability of exemestane, the self-microemulsifying drug delivery system (SMEDDS) was developed. SMEDDS comprises of isotropic mixture of natural or synthetic oil, surfactant, and cosurfactant, which, upon dilution with aqueous media, spontaneously form fine o/w microemulsion with less than 100 nm in droplet size.

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Bicalutamide is a non-steroidal antiandrogen and is an oral medication that is used for treating prostate cancer. To evaluate the bioavailability of bicalutamide from bicalutamide self-microemulsifying drug delivery systems (SMEDDS) and bicalutamide suspension formulations, a sensitive, specific reversed-phase high performance liquid chromatographic (HPLC) method using ultraviolet detection was developed and validated for the analysis of bicalutamide (BCT) in rat blood plasma. Letrozole (LZ) was used as the internal standard.

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The purpose of this research work was to formulate and characterize self-micro emulsifying drug delivery system containing exemestane. The solubility of exemestane was determined in various vehicles. Pseudo ternary phase diagram was used to evaluate the micro-emulsification existence area.

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