Publications by authors named "Tieu P"
Purpose: This study aimed to systematically review the literature to identify the incidence of avascular necrosis (AVN) following hip intra-articular corticosteroid injections (IACSIs) as well as to elucidate risk factors that may predispose patients to AVN following IACSI.
Methods: The MEDLINE, Embase, PubMed, and Web of Science databases were systematically searched through inception to July 21, 2024, in accordance with the PRISMA statement with data extracted for descriptive analysis. The inclusion criteria were hip IACSI and AVN of the femoral head.
Article Synopsis
- Shape-controlled alloy nanoparticle catalysts improve performance in oxygen reduction reactions (ORR) in liquid half-cells, but face challenges in fuel cell applications due to harsher operating conditions.* -
- A new strategy was developed to limit atomic diffusion in surface layers, allowing for the selective transformation of platinum-iron nanowires into stable intermetallic structures at low temperatures.* -
- This surface engineering approach enhances membrane electrode assembly (MEA) stability by reducing iron loss by 50% while maintaining high catalytic activity, showing promise for practical fuel cell applications with shape-controlled catalysts.*
Article Synopsis
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Article Synopsis
- * Researchers used advanced techniques to observe the corrosion behavior of Pd@Pt core-shell nanoparticles, highlighting changes in structure due to electrochemical activities.
- * The findings show that specific areas of the nanoparticles undergo different corrosion processes, providing new insights into how their surfaces change during electrochemical reactions.
Article Synopsis
- Strong metal-support interactions (SMSIs) can cause platinum (Pt) to be encapsulated by oxide supports, typically observed in reducible oxides like TiO and NbO.
- This study demonstrates that amorphous native surface oxide of aluminum nanocrystals (AlNCs) can also exhibit SMSI-induced Pt encapsulation when subjected to hydrogen reduction at 300 °C, leading to isolated Pt single-atom sites being exposed for catalysis.
- The findings suggest that the native oxide on AlNCs allows for a well-defined environment for Pt atoms and promote further research into SMSIs with various materials, potentially leading to enhanced photocatalytic applications due to their unique plasmonic properties.
Article Synopsis
- Single-atom catalysts (SACs) utilize metals more efficiently and show different reactivity compared to traditional metal nanoparticles.
- The study reveals that platinum SACs (Pt SAs) on anatase TiO support display different coordination environments depending on which surface (001 or 101) they are on, affecting their reactivity.
- Findings indicate that Pt SAs beneath the (001) surface have lower reactivity due to reduced access to gas, highlighting the importance of understanding heterogeneous coordination environments in the development of SACs.
Article Synopsis
- * The synthesis involves a quick reduction method using sodium borohydride to develop nanoparticle nests on a graphene support, which boosts performance due to improved catalytic activity and conductivity.
- * NiFe NNG shows impressive efficiency with a low overpotential of 292.3 mV and stability, matching the performance of commercial catalysts, and its unique properties suggest it's promising for future energy storage and conversion applications.
Snakebite envenoming is a potentially life-threatening global public health issue with Bangladesh having one of the highest rates of snakebite cases. The Bede, a nomadic ethnic group in Bangladesh, traditionally engages in snake-related business such as snake charming. The Bede relies on their own ethnomedicinal practitioners for snakebite treatment while there is a lack of concrete evidence on the effectiveness of such ethnomedicinal treatment.
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- The introduction of platinum-group metals (PGMs) to cerium oxide (CeO) enhances redox surface reactions, particularly hydrogen (H) dissociation and surface reduction, which are important in heterogeneous catalysis.
- Research utilized various methods, including temperature-programmed reduction (TPR) and in situ spectroscopy, to investigate how platinum (Pt) nanoclusters and single atoms affect H reactions on Pt/CeO powder catalysts.
- Key findings indicate that Pt significantly speeds up H consumption rates even on small fractions of CeO, alters the mechanism for H activation, and leads to localized changes in Ce distribution at CeO boundaries, ultimately improving H reaction efficiency compared to pure CeO.
Article Synopsis
- Atomically dispersed catalysts, particularly single-atom catalysts, are promising for oxidizing methane to produce valuable compounds like acetic acid and methanol, but they usually have low active site loading, resulting in low product yield.
- The study introduces a method using metal-organic frameworks with porphyrin linkers to enhance rhodium concentrations, achieving a high loading of 5 wt% with excellent dispersity.
- When tested for acetic acid production, this new catalyst reached a performance benchmark of 23.62 mmol·g·h and demonstrated sensitivity to light, allowing for different selectivity between acetic acid and methanol based on illumination conditions.
Background: Current therapeutic agents, including nifurtimox and benznidazole, are not sufficiently effective in the chronic phase of Trypanosoma cruzi infection and are accompanied by various side effects. In this study, 120 kinds of extracts from medicinal herbs used for Kampo formulations and 94 kinds of compounds isolated from medicinal herbs for Kampo formulations were screened for anti-T. cruzi activity in vitro and in vivo.
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- - Fe-N-C single-atom catalysts (SACs) have impressive peroxidase-like activity, mimicking natural enzymes due to isolated iron sites on a carbon substrate.
- - Introducing phosphorus (P) heteroatoms into the carbon matrix of these SACs enhances their catalytic activity, with a specially designed 1D carbon nanowire catalyst showing better performance and stability.
- - While a small amount of P significantly boosts POD-like activity, excessive P doesn't contribute further; this enhanced catalyst is successfully used for sensitive detection of acetylcholine.
Article Synopsis
- Oxidative methane carbonylation is a method for creating valuable compounds like acetic acid (CHCOOH) using methane as a starting material.
- The researchers developed a catalyst using immobilized iridium (Ir) complexes on an oxide support, allowing for efficient methane activation and easy recycling.
- The study found that the migration of methyl groups, crucial for forming carbon-carbon bonds, is influenced by the oxidation state of the iridium, with Ir(IV) favoring acetic acid production and Ir(III) favoring alcohol production (CHOH).
Article Synopsis
- Fe-N-C single-atomic metal site catalysts (SACs) are being explored as alternatives to platinum-based catalysts for oxygen reduction reactions in fuel cells.
- Researchers aim to enhance the efficiency of these catalysts by modifying the electronic structure of their active sites, particularly through the use of heteroatom doping.
- The study introduces chlorine as a near-range coordinator to improve the Fe-N active center, resulting in a catalyst (FeNCl SAC) that shows higher ORR activity compared to traditional FeN SAC, supported by theoretical calculations and experimental results.
Article Synopsis
- The study focuses on creating a catalyst called Fe-SASC that mimics natural enzymes to enhance the detection of herbicides, particularly 2,4-D, in a lateral flow immunoassay (LFIA).
- This catalyst utilizes atomically dispersed iron to maximize its efficiency, offering superior peroxidase-like activity, which aids in achieving high detection sensitivity.
- The Fe-SASC-LFIA demonstrates a broad detection range and low limits of detection, showcasing its potential for quick and accurate point-of-care testing for herbicide exposure in human samples.
Article Synopsis
- - The study develops single-atomic iron doped carbon dots (SA Fe-CDs) through a simple pyrolysis process, creating multifunctional nanozymes for biochemical analysis with enhanced sensing capabilities.
- - The SA Fe-CDs exhibit strong oxidase-mimicking activity that efficiently catalyzes the oxidation of TMB, providing quick and reliable responses, while their photoluminescence is diminished by TMB's oxidation product.
- - A dual assay system for detecting phosphate ions (Pi) is created, utilizing both colorimetric and fluorescence methods with high sensitivity, which could inspire future research on multi-mode sensing using nanozyme technology.
Article Synopsis
- - The development of single atom catalysts (SACs) is driven by the need for efficient catalysts, leveraging various synthetic methods and advanced characterization techniques like transmission electron microscopy (TEM) to improve their properties and performance in chemical reactions.
- - Traditional characterization methods struggle to observe structures at the atomic level, but recent advancements in TEM have enhanced the ability to study SACs by providing detailed insights into their atomic structure, bonding characteristics, and stability.
- - The review emphasizes the valuable contributions of aberration-corrected TEM and in situ techniques for real-time observation, highlighting ongoing challenges and potential future directions for TEM research in the field of SACs.
Therapeutic Oxygen Carriers (TOCs) have been studied in the past for utilization in resuscitation fluid, treatment of organ ischemia, and as an alternative to red blood cell transfusion. One TOC, Hemarina-M101, seems promising in transplantation and oxygenation due its capability as a non-immunogenic, nontoxic, high-oxygen-carrying capacity TOC with little to no side effects. This mini-review focuses on Hemarina-M101 and explores its characteristics and possible utilities through past and recent studies.
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- Researchers tackled two main challenges in perovskite solar cells: long-term stability and lead ion leakage.
- They introduced a thiol-functionalized 2D conjugated metal-organic framework to improve performance at the perovskite/cathode interface, achieving a power conversion efficiency of 22.02%.
- Their modified solar cells maintained over 90% efficiency after 1,000 hours of intense testing and effectively captured leaked lead, enhancing both stability and safety for future perovskite photovoltaic technologies.
Article Synopsis
- A study highlights a Zr(iv)-carboxylate framework that maintains its crystalline structure even after extreme heat causes its carboxylate links to break.
- When exposed to high temperatures (450 °C and above), the framework undergoes a transformation that generates stable nanographene structures through the benzannulation of alkyne groups.
- The resulting Zr oxide/nanographene hybrid exhibits strong stability, is resistant to harsh chemicals like saturated NaOH and concentrated HPO, and can be modified to increase surface area while keeping its structure intact.
Metal nanoparticle catalysts functionalized with small, well-defined organic ligands are important because such systems can provide a spatial control in the catalyst-substrate interactions. This article describes the synthesis, stability, and catalytic property evaluations of four different Pd nanoparticles capped with constitutional isomers of pentanethiolate ligands that have either a straight chain or an alkyl chain with one methyl group at different locations (α, β, or γ from the surface-bound sulfur). The structure and composition analyses of Pd nanoparticles confirm that they have similar average core sizes and organic ligand contents.
View Article and Find Full Text PDFThe occurrence of neutralizing anti-FVIII antibodies is a major complication in the treatment of patients affected by hemophilia A. The immune response to FVIII is a complex, multi-factorial process that has been extensively studied for the past two decades. The reasons why only a proportion of hemophilic patients treated with FVIII concentrates develop a clinically significant immune response is incompletely understood.
View Article and Find Full Text PDFMolecular Mechanisms of Inhibitor Development in Hemophilia.
Mediterr J Hematol Infect Dis
January 2020
The development of neutralizing antibodies in hemophilia is a serious complication of factor replacement therapy. These antibodies, also known as "inhibitors", significantly increase morbidity within the hemophilia population and lower the quality of life for these patients. People with severe hemophilia A have an overall 25-40% lifetime risk of inhibitor development, compared to that of 5-15% lifetime risk in those with moderate/mild hemophilia A.
View Article and Find Full Text PDFNeonatal inferior vena cava syndrome (IVCS), though uncommon, is associated with significant morbidity and mortality. Information on risk factors, diagnosis, treatment, and outcomes is limited. This review comprised 61 neonates across 33 reports.
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