Publications by authors named "GJ Brown"

Article Synopsis
  • The study investigates the thermal decomposition of 2-cyclopentenone during biomass pyrolysis, utilizing both experimental techniques and theoretical models.
  • Gas-phase pyrolysis experiments were conducted at high temperatures, revealing various products like carbon monoxide and different hydrocarbons through FTIR spectroscopy.
  • Five distinct decomposition pathways were identified, including multiple H atom migrations and C-C bond ruptures, leading to the formation of compounds such as acrolein, propane derivatives, and intermediates like cyclopropenone.
View Article and Find Full Text PDF

Whole-exome sequencing of two unrelated kindreds with systemic autoimmune disease featuring antinuclear antibodies with IgG4 elevation uncovered an identical ultrarare heterozygous TNIP1 variant segregating with disease. Mice with the orthologous Q346P variant developed antinuclear autoantibodies, salivary gland inflammation, elevated IgG2c, spontaneous germinal centers and expansion of age-associated B cells, plasma cells and follicular and extrafollicular helper T cells. B cell phenotypes were cell-autonomous and rescued by ablation of Toll-like receptor 7 (TLR7) or MyD88.

View Article and Find Full Text PDF

Systemic lupus erythematosus (SLE) is a heterogeneous autoimmune disease with a clear genetic component. While most SLE patients carry rare gene variants in lupus risk genes, little is known about their contribution to disease pathogenesis. Amongst them, SH2B3-a negative regulator of cytokine and growth factor receptor signaling-harbors rare coding variants in over 5% of SLE patients.

View Article and Find Full Text PDF

A safe and productive workplace requires a sober workforce, free from substances that impair judgment and concentration. Although drug monitoring programs already exist, the scope and loopholes of standard workplace testing panels are well known, allowing other substances to remain a source of risk. Therefore, a high-throughput urine screening method for psilocin, mitragynine, phencyclidine, ketamine, norketamine and dehydronorketamine was developed and validated in conjunction with a urine and blood confirmation method.

View Article and Find Full Text PDF
Article Synopsis
  • Autosomal dominant loss-of-function variants in CTLA-4 cause immune system issues like autoimmunity and immunodeficiency, known as IDAIL, which show variability in symptoms due to genetic modifiers.* -
  • The study identifies a patient with a pathogenic CTLA-4 variant and a rare DECTIN-1 variant that affects DECTIN-1's function, leading to reduced immune regulation.* -
  • DECTIN-1 is shown to enhance the differentiation of regulatory T cells and plays a critical role as a modifier that influences the severity of immune defects caused by CTLA-4 haploinsufficiency.*
View Article and Find Full Text PDF
Article Synopsis
  • * This variant enhances the receptor's ability to detect guanosine and other molecules, influencing the behavior of B cells and contributing to the development of lupus-like symptoms in mice.
  • * Findings suggest that targeting TLR7 or its downstream partner MyD88 could offer new therapeutic strategies for treating lupus by addressing the aberrant immune responses associated with the disease.
View Article and Find Full Text PDF

Objective: Management of covert submucosal invasive cancer (SMIC) discovered after piecemeal endoscopic mucosal resection (pEMR) of large (>20 mm) non-pedunculated colorectal polyps is challenging. The residual cancer risk is largely unknown. We sought to evaluate this in a large tertiary referral cohort.

View Article and Find Full Text PDF

Obstructive sleep apnea (OSA) is a chronic and prevalent condition with well-established comorbidities. However, many severe cases remain undiagnosed due to poor access to polysomnography (PSG), the gold standard for Obstructive sleep apnea (OSA) diagnosis. Accurate home-based methods to screen for OSA are needed, which can be applied inexpensively to high-risk subjects to identify those that require PSG to fully assess their condition.

View Article and Find Full Text PDF
Article Synopsis
  • Rebreathers are devices that allow divers to recycle exhaled gas, helping them stay underwater longer with less equipment, but they can fail, leading to dangerous conditions like hypoxia.
  • This study aimed to see if pulse oximeters could give divers advance warning of low oxygen levels when the oxygen system in rebreathers fails.
  • Results showed that pulse oximeters placed on the forehead and nasal ala provided about 32 seconds of warning before the risk of unconsciousness, suggesting they could serve as a useful safety feature for divers using rebreathers.
View Article and Find Full Text PDF

An interesting pattern of tail-in, head-out sperm agglutination was identified in a Brucella canis seronegative subfertile dog. Centrifuged seminal plasma from this dog could induce a similar pattern of agglutination in six other dogs, but not in ejaculates from a single stallion and two rams. The agglutination pattern was short-lived and appeared to depend on motility of spermatozoa, although intensity of agglutination may have been affected by concentration of agglutinating factor.

View Article and Find Full Text PDF

Improved blood tests assessing the functional status of rare gluten-specific CD4+ T cells are needed to effectively monitor experimental therapies for coeliac disease (CD). Our aim was to develop a simple, but highly sensitive cytokine release assay (CRA) for gluten-specific CD4+ T cells that did not require patients to undergo a prior gluten challenge, and would be practical in large, multi-centre clinical trials. We developed an enhanced CRA and used it in a phase 2 clinical trial ("RESET CeD") of Nexvax2, a peptide-based immunotherapy for CD.

View Article and Find Full Text PDF

A recent rise in snorkeling-related deaths in Hawaii has inspired several bans on full face snorkel masks (FFSMs). However, while there are theories to explain the deaths, little physiological data exists about the way the FFSMs provide gas to an exercising subject. To evaluate the safety of the FFSM concept, this study was designed to test how use of a full face snorkel mask (FFSM) may be physiologically different than use of a conventional snorkel, and to assess if any of those differences could lead to increased risk for the snorkeler.

View Article and Find Full Text PDF

Background: Critical peptic ulcer bleeding requiring massive transfusion is a gastroenterological emergency. Few data exist on management and outcomes. The Australian and New Zealand Massive Transfusion Registry collects comprehensive data on adult patients receiving massive transfusion across all bleeding contexts.

View Article and Find Full Text PDF

The 2-butyn-1-yl radical is an isomer of CH and is structurally similar to the propargyl radical, which is the simplest resonance-stabilized hydrocarbon radical. The CH radical is likely to be important to astrochemistry and combustion, similar to propargyl, yet little research has been done on its spectroscopic properties. In this work, seven vibrational bands of the 2-butyn-1-yl radical are reported.

View Article and Find Full Text PDF

Background: Management of major gastrointestinal bleeding (GIB) may require massive transfusion (MT), but limited data are available. Upper and lower GIB have different aetiologies, prognosis, bleeding patterns and outcomes. Better understanding of current transfusion management and outcomes in these patients is important.

View Article and Find Full Text PDF

Training software to facilitate participation in conversations where overlapping talk is common was to be developed with the involvement of Cochlear implant (CI) users. Examples of common types of overlap were extracted from a recorded corpus of 3.5 hours of British English conversation.

View Article and Find Full Text PDF

This paper presents a bi-view (front and side) audiovisual Lombard speech corpus, which is freely available for download. It contains 5400 utterances (2700 Lombard and 2700 plain reference utterances), produced by 54 talkers, with each utterance in the dataset following the same sentence format as the audiovisual "Grid" corpus [Cooke, Barker, Cunningham, and Shao (2006). J.

View Article and Find Full Text PDF

Ferromagnetic insulators are required for many new magnetic devices, such as dissipationless quantum-spintronic devices, magnetic tunneling junctions, etc. Ferromagnetic insulators with a high Curie temperature and a high-symmetry structure are critical integration with common single-crystalline oxide films or substrates. So far, the commonly used ferromagnetic insulators mostly possess low-symmetry structures associated with a poor growth quality and widespread properties.

View Article and Find Full Text PDF

State-of-the-art compact antennas rely on electromagnetic wave resonance, which leads to antenna sizes that are comparable to the electromagnetic wavelength. As a result, antennas typically have a size greater than one-tenth of the wavelength, and further miniaturization of antennas has been an open challenge for decades. Here we report on acoustically actuated nanomechanical magnetoelectric (ME) antennas with a suspended ferromagnetic/piezoelectric thin-film heterostructure.

View Article and Find Full Text PDF

Background & Aims: Among patients with large colorectal sessile polyps or laterally spreading lesions, it is important to identify those at risk for submucosal invasive cancer (SMIC). Lesions with overt endoscopic evidence of SMIC are referred for surgery, although those without these features might still contain SMIC that is not visible on endoscopic inspection (covert SMIC). Lesions with a high covert SMIC risk might be better suited for endoscopic submucosal dissection than for endoscopic mucosal resection (EMR).

View Article and Find Full Text PDF

Background: A gluten-free diet is the only means to manage coeliac disease, a permanent immune intolerance to gluten. We developed a therapeutic vaccine, Nexvax2, designed to treat coeliac disease. Nexvax2 is an adjuvant-free mix of three peptides that include immunodominant epitopes for gluten-specific CD4-positive T cells.

View Article and Find Full Text PDF

Magnetoelectric effect, arising from the interfacial coupling between magnetic and electrical order parameters, has recently emerged as a robust means to electrically manipulate the magnetic properties in multiferroic heterostructures. Challenge remains as finding an energy efficient way to modify the distinct magnetic states in a reliable, reversible, and non-volatile manner. Here we report ferroelectric switching of ferromagnetic resonance in multiferroic bilayers consisting of ultrathin ferromagnetic NiFe and ferroelectric Pb0.

View Article and Find Full Text PDF

Objectives: Clinically significant bleeding (CSPEB) is the most frequent adverse event following wide-field endoscopic mucosal resection (WF-EMR) of large sessile and laterally spreading colorectal lesions (LSL). There is limited knowledge regarding accurate prediction of CSPEB. We aimed to derive a score to predict the risk of CSPEB.

View Article and Find Full Text PDF

Supercritical fluid carbon dioxide (sc-CO2) is capable of depositing nanoparticles in small structures of silicon substrates because of its gas-like penetration, liquid-like solvation abilities, and near-zero surface tension. In nanometer-sized shallow wells on silicon surface, formation of two-dimensional (2D) monolayer metal nanoparticle (NP) clusters can be achieved using the sc-CO2 deposition method. Nanoparticles tend to fill nanostructured holes first, and then, if sufficient nanoparticles are available, they will continue to cover the flat areas nearby, unless defects or other surface imperfections are available.

View Article and Find Full Text PDF