Publications by authors named "Oyama K"

Indano[60]fullerene bromide was isolated as a key intermediate in the synthesis of indano[60]fullerene ketone, an evaporable fullerene derivative. Based on the identified reaction mechanism, aqueous hydrobromic acid was used to achieve reproducible and high-yielding reactions. A scalable one-pot reaction from aryl[60]fullerenyl dimers to indano[60]fullerene ketone was also demonstrated.

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Macrophage phagocytosis plays a role in cancer immunotherapy. The phagocytic activity of macrophages, regulated by circadian clock genes, shows time-dependent variation. Intervening in the circadian clock machinery of macrophages is a potentially novel approach to cancer immunotherapy; however, data on this approach are scarce.

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A circadian clock is reconstituted in vitro by incubating three proteins, KaiA, KaiB, and KaiC from the non-nitrogen-fixing cyanobacterium Synechococcus elongatus PCC 7942 in the presence of ATP. Leptolyngbya boryana is a filamentous cyanobacterium that grows diazotrophically under microoxic conditions. Among the aforementioned proteins, KaiC is the main clock oscillator belonging to the RecA ATPase superfamily.

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Defects in Aryl hydrocarbon receptor nuclear translocator-like 1 (ARNTL), a central component of the circadian clock mechanism, may promote or inhibit the induction of inflammation by monocytes/macrophages, with varying effects on different diseases. However, ARNTL's role in monocytes/macrophages under chronic kidney disease (CKD), which presents with systemic inflammation, is unclear. Here, we report that the expression of in monocytes promoted CKD-induced cardiac damage.

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Introduction: The global increase in cardiovascular diseases has resulted in an augmented development of artificial small-caliber vascular grafts used in bypass graft surgeries, such as coronary and distal artery bypass graft surgeries. However, no consensus exists regarding the best method for creating vascular grafts. Poly-ε-caprolactone (PCL) is a biocompatible and biodegradable material that has been widely studied as a scaffold for tissue regeneration, inclusive of vascular grafts.

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Nonhuman primates, particularly macaque and marmoset monkeys, serve as invaluable models for studying complex brain functions and behavior. However, the lack of suitable genetic neuromodulation tools has constrained research at the network level. This review examines the application of a chemogenetic technology, specifically, designer receptors exclusively activated by designer drugs (DREADDs), to nonhuman primates.

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Article Synopsis
  • - The study explores a deep learning method designed to predict dementia risk using blood test data, particularly examining the role of nutritional status indicators, like serum albumin, in older adults.
  • - Researchers analyzed data from 1,287 patients, separating them by age (65 and above vs. below 65) to assess how including serum albumin influenced the model's accuracy in predicting cognitive function measured by the Mini-Mental State Examination.
  • - Results showed that including serum albumin improved prediction accuracy slightly for both age groups, with a more significant enhancement in those under 65, indicating the potential importance of nutritional status in dementia risk assessment.
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  • - This study examines how data augmentation using generative adversarial networks (GANs) can enhance the prediction of dementia risk through deep neural networks (DNNs), specifically focusing on blood test and periodontal examination data.
  • - Challenges in creating accurate models include high costs, limited sample sizes, and missing data from various tests, which can hinder effective dementia risk predictions.
  • - The results showed that DNNs using GAN-synthesised data outperformed those using real data, with improved accuracy and robustness against missing information, indicating a promising avenue for better dementia risk prediction methods.
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Background: Pancreatic ductal adenocarcinoma tumors exhibit resistance to chemotherapy, targeted therapies, and even immunotherapy. Dendritic cells use glucose to support their effector functions and play a key role in anti-tumor immunity by promoting cytotoxic CD8 T cell activity. However, the effects of glucose and lactate levels on dendritic cells in pancreatic ductal adenocarcinoma are unclear.

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The effect of immune checkpoint inhibitors is extremely limited in patients with pancreatic ductal adenocarcinoma (PDAC) due to the suppressive tumor immune microenvironment. Autophagy, which has been shown to play a role in antitumor immunity, has been proposed as a therapeutic target for PDAC. In this study, single-cell RNA sequencing of autophagy-deficient murine PDAC tumors revealed that autophagy inhibition in cancer cells induced dendritic cell (DC) activation.

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  • The Letter reports the most accurate measurement so far of the matter-antimatter imbalance during Pb-Pb collisions at a high energy level of 5.02 TeV.
  • It utilizes the Statistical Hadronization framework to determine precise values for the electric charge and baryon chemical potentials, μ_{Q} and μ_{B}.
  • The analysis of antiparticle-to-particle yield ratios shows that the collisions create a system that is generally baryon-free and electrically neutral at midrapidity.
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Background: Tumor-associated neutrophils (TANs) constitute an abundant component among tumor-infiltrating immune cells and have recently emerged as a critical player in pancreatic ductal adenocarcinoma (PDAC) progression. This study aimed to elucidate the pro-tumor mechanisms of TAN and identify a novel target for effective immunotherapy against PDAC.

Methods: Microarray and cytokine array analyses were performed to identify the mechanisms underlying the function of TANs.

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Article Synopsis
  • The study examines the use of data augmentation techniques to enhance the prediction of dementia risk through machine learning models, specifically focusing on easily obtainable blood test results and periodontal examination data.
  • It employs advanced techniques like SMOGN, GAN, and CTGAN on datasets comprising cognitive assessments, demographics, and test results, utilizing various machine learning models for evaluation.
  • Findings indicate that while normal GANs improve data diversity, CTGANs better preserve data structure, significantly enhancing the performance of linear regression models when applied to synthesized data.
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Primates must adapt to changing environments by optimizing their behavior to make beneficial choices. At the core of adaptive behavior is the orbitofrontal cortex (OFC) of the brain, which updates choice value through direct experience or knowledge-based inference. Here, we identify distinct neural circuitry underlying these two separate abilities.

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Ferrihydrite is omnipresent in nature, and its adsorption of As(III/V) decides the migration of arsenic. Although As(III) is commonly recognized as the more mobile species of inorganic arsenic, it sometimes exhibits less mobility in ferrihydrite systems, which calls for further insights. In this study, we elucidated the adsorption behavior and mechanisms of As(III/V) on ferrihydrite under different loading levels (molar ratio As/Fe = 0-0.

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  • The study investigates the relationship between total parenteral nutrition (TPN) and serum osmolality in preterm infants, focusing on whether higher osmolality increases the risk of patent ductus arteriosus (PDA).
  • It compares medical records of preterm infants born before and after TPN implementation, examining serum osmolality changes and PDA incidence over the first five days of life.
  • Findings indicate that higher serum osmolality is associated with a higher incidence of PDA, particularly linked to serum sodium levels and the timing after birth.
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Introduction: In this study, we investigated the correlation between serum albumin levels and cognitive function, and examined the impact of including serum albumin values in the input layer on the prediction accuracy when forecasting cognitive function using deep learning and other machine learning models.

Methods: We analyzed the electronic health record data from Osaka Medical and Pharmaceutical University Hospital between 2014 and 2021. The study included patients who underwent cognitive function tests during this period; however, patients from whom blood test data was not obtained up to 30 days before the cognitive function tests and those with values due to measurement error in blood test results were excluded.

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In this study, we investigated improving the performance of a layered double hydroxide (LDH) for the adsorption of As(III) and As(V) by controlling the morphology of LDH crystals. The LDH was synthesized via a simple coprecipitation method using barely soluble MgO as a precursor and succinic acid (SA) as a morphological control agent. Doping the LDH crystals with carboxylate ions (RCOO) derived from SA caused the crystals to develop in a radial direction.

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The ALICE Collaboration reports the measurement of semi-inclusive distributions of charged-particle jets recoiling from a high transverse momentum (high p_{T}) hadron trigger in proton-proton and central Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV. A data-driven statistical method is used to mitigate the large uncorrelated background in central Pb-Pb collisions.

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Antigen-presenting cells (APCs) play a crucial role in the immune system by breaking down antigens into peptide fragments that subsequently bind to major histocompatibility complex (MHC) molecules. Previous studies indicate that stable proteins can impede CD4+ T cell stimulation by hindering antigen processing and presentation. Conversely, certain proteins require stabilization in order to activate the immune response.

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Article Synopsis
  • Visual object memory is crucial for various cognitive skills, and while the anterior temporal cortex's role has been studied in primates, the full picture including large-scale networks and neuronal dynamics is still unclear.
  • Researchers found that the orbitofrontal node works closely with the anterior temporal node for object memory by using functional imaging and a short-term memory task in male macaques.
  • Silencing the orbitofrontal node disrupted performance on memory tasks by affecting the anterior temporal cortex's function, demonstrating its significant role in enhancing memory signals while not altering perceptual processing.
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Differential expression of genes is key to mediating developmental and stress-related plant responses. Here, we addressed the regulation of plant metabolic responses to biotic stress and the developmental variation of defense-related genes in four species of the genus with variable patterns of metabolite accumulation and development. We combine transcriptome profiling with phylogenomic techniques to analyze gene expression and coexpression in plants subjected to damage by a specialist folivore insect.

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An 80-year-old male patient presented with a 2.5 cm-sized submucosal tumor on the greater curvature side of the upper gastric body during an endoscopic examination in 200X. We diagnosed gastric GIST by biopsy and performed laparoscopic- assisted partial gastrectomy.

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