Publications by authors named "Perera L"

Article Synopsis
  • Sodium chloride (NaCl) is significant across various fields, including geochemistry and food production, and is one of the most prevalent salts in the cosmos.
  • Researchers discovered a new form of NaCl, a metastable dihydrate, created by rapidly freezing a NaCl solution, which transforms into hydrohalite and ice Ih when heated above 190 K.
  • This finding suggests that the presence of this new hydrate on icy celestial bodies, like Jupiter and Saturn's moons, could indicate areas where subsurface brines have recently frozen, highlighting potential targets for future space missions.
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  • The study explores the aggregation process of α-synuclein, a protein linked to Parkinson's Disease and Multiple System Atrophy, and its implications for research.
  • Researchers determined the first atomic structure of mouse α-synuclein fibrils, revealing similarities to fibrils found in human conditions, but with important differences in their properties.
  • The findings indicate that mouse α-synuclein fibrils have altered behaviors, suggesting a need to reevaluate their use in developing diagnostic tools and treatments for related diseases.
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Background: High intensity focused ultrasound (HIFU) ablation treatment for uterine fibroids and adenomyosis has been long developed. The aim of this study is to investigate miRNA profile changes in vaginal secretions after HIFU treatment and their clinical relevance.

Methods: We prospectively collected vaginal secretions samples from 8 patients (1 with adenomyosis and 7 with fibroids) before and after HIFU treatment.

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  • APECED is a serious genetic autoimmune disorder linked to variants in the autoimmune regulator (AIRE) gene, with 16% of evaluated patients lacking known harmful variants, most of whom are of Puerto Rican descent.
  • Researchers discovered a deep intronic variant (c.1504-818 G>A) in these patients that causes a cryptic splice site leading to a dysfunctional protein through pseudoexon inclusion.
  • They developed an antisense oligonucleotide (ASO) that corrected this genetic issue, demonstrating the potential for targeted treatments in APECED patients.
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Rationale: Spironolactone is a steroidal drug prescribed for a variety of medical conditions and is extensively metabolized quickly after administration. Measurement of spironolactone and its metabolites remains challenging using mass spectrometry (MS) due to in-source fragmentation and relatively poor ionization using electrospray ionization. Therefore, improved methods of measurements are needed, particularly in the case of small sample volumes.

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Objective: To identify factors influencing the availability and sales of healthy food and drinks in a café located in a hospital setting in a rural area.

Methods: Three online and 1 in-person group model building workshops were conducted with hospital staff members to develop a causal loop diagram.

Results: Four areas in the causal loop diagram were identified, 5 teams were created to implement 15 identified action ideas, and an action registry was created to track their progress.

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Analyzing pharmaceutical products is a quality control requirement in a production facility. This study presents a CuO electrode-based reusable non-enzymatic sensor as an alternative method for rapid analysis of glucose levels in glucose infusions. CuO is extensively employed as an electrode material in non-enzymatic glucose sensors.

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Breast cancer resistance protein (BCRP) is a drug efflux transporter expressed on the epithelial cells of the small intestine and on the lateral membrane of the bile duct in the liver; and is involved in the efflux of substrate drugs into the gastrointestinal lumen and secretion into bile. Recently, the area under the plasma concentration-time curve (AUC) of rosuvastatin (ROS), a BCRP substrate drug, has been reported to be increased by BCRP inhibitors, and BCRP-mediated drug-drug interaction (DDI) has attracted attention. In this study, we performed a ROS uptake study using human colon cancer-derived Caco-2 cells and confirmed that BCRP inhibitors significantly increased the intracellular accumulation of ROS.

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Lung cancer metastasis often leads to a poor prognosis for patients. Mesenchymal-epithelial transition (MET) is one key process associated with metastasis. MET has also been linked to multidrug drug resistance (MDR).

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Unlabelled: Patients with cancer and diabetes face unique challenges. Limited data are available on diabetes management in patients undergoing concurrent chemoradiotherapy (CCRT), a curative intent anticancer therapy commonly associated with glucocorticoid administration, weight fluctuations and enteral feeds. This retrospective case-control study examined the real-world incidence of acute diabetes-related complications in patients with head and neck cancer receiving CCRT, along with the impact of diabetes on CCRT tolerance and outcomes.

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Introduction: Adverse reactions are relatively common during peanut oral immunotherapy. To reduce the risk to the patient, some researchers have proposed modifying the allergen to reduce IgE reactivity, creating a putative hypoallergen. Analysis of recently cloned human IgG from patients treated with peanut immunotherapy suggested that there are three common conformational epitopes for the major peanut allergen Ara h 2.

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Formation of active HIV-1 reverse transcriptase (RT) proceeds via a structural maturation process that involves subdomain rearrangements and formation of an asymmetric p66/p66' homodimer. These studies were undertaken to evaluate whether the information about this maturation process can be used to identify small molecule ligands that retard or interfere with the steps involved. We utilized the isolated polymerase domain, p51, rather than p66, since the initial subdomain rearrangements are largely limited to this domain.

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The donor-acceptor (D-A) type of conjugated polymers has emerged as the paradigm of the third generation of electronically conducting polymers demonstrating improved infrared activity and intrinsic electronic conductivity. Judicious selection of donor (D) and acceptor (A) monomers for copolymerization can further fine-tune these properties. Notably, for such refinement, natural compounds provide many conjugated molecules with various functional groups.

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The vast majority of severe (Type 0) spinal muscular atrophy (SMA) cases are caused by homozygous deletions of survival motor neuron 1 (). We report a case in which the patient has two copies of but clinically presents as Type 0 SMA. The patient is an African American male carrying a homozygous maternally inherited missense variant (c.

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Professional Members of the Crohn's & Colitis Foundation are gastroenterologists, residents, fellows, advanced practice providers, nurses, and other healthcare professionals, just like you. They join to support research, to access professional and patient IBD education, and to establish themselves as IBD subject matter experts. Crohn's & Colitis Foundation Professional Members are the first to know about new patient resources, just like this one.

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Adipokines have not been studied in acute dengue, despite their emerging role in inducing and regulating inflammation. Therefore, we sought to identify adipokine levels in patients with varying severities of acute dengue to understand their role in disease pathogenesis. We determined the levels of leptin, resistin, omentin, adiponectin, as well as IFNβ, and NS1 using quantitative ELISA in patients with dengue fever (DF = 49) and dengue haemorrhagic fever (DHF = 22) at admission (febrile phase) and at the time of discharge (recovery phase).

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The inhibition of human ether-a-go-go-related gene (hERG) channels is a known cause of QT prolongation triggered by antipsychotic drugs. Our previous studies suggest that P-glycoprotein (P-gp)-mediated drug interactions may lead to increased gastrointestinal absorption of pimozide and its accumulation in cardiomyocytes, thereby enhancing the inhibitory effect of hERG channels. There is a paucity of epidemiological studies examining the risk of QT prolongation by antipsychotic drugs in terms of P-gp-mediated interactions with concomitant drugs.

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Asthma is a chronic disease of the airways that impairs normal breathing. The etiology of asthma is complex and involves multiple factors, including the environment and genetics, especially the distinct genetic architecture associated with ancestry. Compared to early-onset asthma, little is known about genetic predisposition to late-onset asthma.

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As there are limited data on B-cell epitopes for the nucleocapsid protein in SARS-CoV-2, we sought to identify the immunodominant regions within the N protein, recognized by patients with varying severity of natural infection with the Wuhan strain (WT), delta, omicron, and in those who received the Sinopharm vaccines, which is an inactivated, whole virus vaccine. Using overlapping peptides representing the N protein, with an in-house ELISA, we mapped the immunodominant regions within the N protein, in seronegative (n = 30), WT infected (n = 30), delta infected (n = 30), omicron infected + vaccinated (n = 20) and Sinopharm (BBIBP-CorV) vaccinees (n = 30). We then investigated the sensitivity and specificity of these immunodominant regions and analyzed their conservation with other SARS-CoV-2 variants of concern, seasonal human coronaviruses, and bat Sarbecoviruses.

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Berberine was extracted from (tree turmeric) and purified by column chromatography. The UV-Vis absorption spectroscopy of berberine was studied in acetonitrile and aqueous media. TD-DFT calculations employing the B3LYP functional were found to reproduce the general features of the absorption and emission spectra correctly.

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Article Synopsis
  • Certain tRNA transcripts in bacteria, archaea, and eukarya contain introns and require splicing to become mature, with splicing in eukaryotes initiated by the TSEN complex.
  • The study reports cryo-electron microscopy structures of the human TSEN-pre-tRNA complex, revealing its architecture and binding interfaces, along with features important for recognizing pre-tRNA.
  • TSEN54 serves as a key scaffold in the complex, and the structures allow for visualization of mutations linked to pontocerebellar hypoplasia (PCH), shedding light on pre-tRNA splicing mechanisms and PCH-related disorders.
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Introduction: Pet lipocalins are respiratory allergens with a central hydrophobic ligand-binding cavity called a calyx. Molecules carried in the calyx by allergens are suggested to influence allergenicity, but little is known about the native ligands.

Methods: To provide more information on prospective ligands, we report crystal structures, NMR, molecular dynamics, and florescence studies of a dog lipocalin allergen Can f 1 and its closely related (and cross-reactive) cat allergen Fel d 7.

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Adipokines have not been studied in acute dengue, despite their emerging role in inducing and regulating inflammation. Therefore, we sought to identify adipokine levels in patients with varying severities of acute dengue to understand their role in disease pathogenesis. We determined the levels of leptin, resistin, omentin, adiponectin, as well as IFNβ, and NS1 using quantitative ELISA in patients with dengue fever (DF=49) and dengue haemorrhagic fever (DHF=22) at admission (febrile phase) and at the time of discharge (recovery phase).

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