Publications by authors named "Dongyeon Lee"

Antibiotic-resistant ribosome variants arise spontaneously in bacterial populations; however, their impact on the overall bacterial physiology remains unclear. We studied the naturally arising antibiotic-resistant L22* ribosome variant of and identified a Mg-dependent physiological cost. Coculture competition experiments show that Mg limitation hinders the growth of the L22* variant more than the wild type (WT), even under antibiotic pressure.

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  • Patients getting radiation therapy often feel anxious, which can cause their muscles to tense up.
  • The study used smartwatches to measure heart rate and stress levels in patients during their treatment.
  • Results showed that all patients had higher heart rates and stress during treatment, but these levels went down as they kept getting treated.
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Background: Posttransplantation diabetes mellitus (PTDM) is a crucial problem after kidney transplantation. We aimed to determine whether metformin affects cardiovascular and graft outcomes in patients with PTDM.

Methods: This retrospective cohort study included 1,663 kidney transplant recipients without preexisting diabetes mellitus.

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It is essential to understand the barrier height, ideality factor, and role of inhomogeneities at the metal/semiconductor interfaces in nanowires for the development of next generation nanoscale devices. Here, we investigate the drain current ()-gate voltage () characteristics of GaN nanowire wrap-gate transistors (WGTs) for various gate potentials in the wide temperature range of 130-310 K. An anomalous reduction in the experimental barrier height and rise in the ideality factor with reducing the temperature have been perceived.

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  • Accurate detection of gait phases is essential for controlling robotic prostheses effectively in lower limb amputees, and various sensing methods have been explored to enhance this detection process.
  • This paper presents a novel wearable sensor combining bioimpedance and surface electromyography (sEMG) to improve gait phase detection accuracy, with tests conducted on a transtibial amputee.
  • The results indicate that the combined use of bioimpedance and sEMG achieves the highest accuracy at 95.1%, surpassing the accuracy of either method used alone, highlighting the potential for enhanced motion intention detection in various applications.
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We used capacitance-voltage (-), conductance-voltage (-), and noise measurements to examine the carrier trap mechanisms at the surface/core of an AlGaN/GaN nanowire wrap-gate transistor (WGT). When the frequency is increased, the predicted surface trap density promptly drops, with values ranging from 9.1 × 10 eV∙cm at 1 kHz to 1.

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Background: Dual-energy (DE) chest radiography (CXR) enables the selective imaging of two relevant materials, namely, soft tissue and bone structures, to better characterize various chest pathologies (i.e., lung nodule, bony lesions, etc.

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In the present study, novel InVO/SnWO nanocomposites with different concentrations of SnWO were successfully prepared using a facile hydrothermal technique and investigated employing a wide range of analytical methods for efficient photocatalytic degradation of tetracycline (TC). X-ray diffraction analysis showed the presence of the orthorhombic phases of both InVO and SnWO in the composite catalyst. Dispersion of SnWO nanoplates over the InVO nanosheets enhanced the synergistic interactions, improving the separation of charge carriers and their transfer.

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Background: Lipid profile as a prognostic factor in terminal cancer patients is controversial. This study aimed to provide useful information related to the treatment of patients with terminal cancer by examining lipid profiles and their association with survival time.

Methods: We retrospectively reviewed the medical records of 428 inpatients who died while receiving palliative care a university hospital in Daegu during September 2015-September 2020 and then analyzed differences in survival times and the relative risk associated with lipid profiles.

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The development of excellent photocatalysts is of great significance for the efficient photocatalytic degradation process, however, the low carrier separation efficiency and poor light absorption ability typically limit the performance of photocatalysts. Herein, a visible light responsive heterostructure composed with indium vanadium oxide nanosheets supported bismuth tungsten oxide nanoflakes (InVO/BiWO) was synthetized through in-situ hydrothermal method. Further, the photocatalytic activity was performed for tetracycline (TC) under visible light illumination.

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Based on an analysis of the signal characteristics of gas sensors, this work presents a chemoresistive sensor readout circuit design for detecting gases with slow response time characteristics. The proposed readout circuit directly generates a reference voltage corresponding to the initial value of the gas sensor and extracts only the amount of gas concentration change in the sensor. Because the proposed readout circuit can adaptively regenerate the suitable reference voltage under various changing ambient conditions, it can alleviate the variation in output values at the same gas concentration caused by non-uniformities among gas sensors.

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Contrary to multicellular organisms that display segmentation during development, communities of unicellular organisms are believed to be devoid of such sophisticated patterning. Unexpectedly, we find that the gene expression underlying the nitrogen stress response of a developing Bacillus subtilis biofilm becomes organized into a ring-like pattern. Mathematical modeling and genetic probing of the underlying circuit indicate that this patterning is generated by a clock and wavefront mechanism, similar to that driving vertebrate somitogenesis.

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The immunomodulatory effects of HDB1258 were evaluated in mice with colitis induced by (KO). HDB1258 was cultured in the lava seawater (LS) to improve its probiotic properties. It increased adhesive ability to mucin with mRNA expression levels of chaperone proteins (such as GroEL/ES, DnaKJ, and HtrA).

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In this study, breast phantoms were fabricated by emulating glandular and adipose tissues separately using a three-dimensional (3D) printer. In addition, direct and quantitative glandular dose evaluations were performed. A quantitative method was developed to evaluate the glandular and adipose tissues separately when performing glandular dose evaluations.

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A simple hydrothermal approach was demonstrated for synthesizing a coupled NiFeO-ZnWO nanocomposite, wherein one-dimensional ZnWO nanorods were inserted into two-dimensional NiFeO nanoplates. Herein, we evaluated the photocatalytic removal of Cr(VI), and degradation of tetracycline (TC) and methylene blue (MB) by the nanocomposite, as well as its ability to split water. The ZnWO nanorods enriched the synergistic interactions, upgraded the solar light fascination proficiency, and demonstrated outstanding detachment and migration of the photogenerated charges, as confirmed by a transient photocurrent study and electrochemical impedance spectroscopy measurements.

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Over the past few years, industrial pollution has had a negative impact on aquatic life by releasing significant amounts of hazardous chemicals into the ecosystem. Therefore, it is imperative to develop photocatalytic materials with good photocatalytic activity and easy separation. Photocatalytic degradation has been employed for the removal of such contaminants using binary hybrid nanocomposites as photocatalysts.

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Purpose: Megavoltage computed tomography (MVCT) offers an opportunity for adaptive helical tomotherapy. However, high noise and reduced contrast in the MVCT images due to a decrease in the imaging dose to patients limits its usability. Therefore, we propose an algorithm to improve the image quality of MVCT.

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The engineering of C photosynthetic activity into the C plant rice has the potential to nearly double rice yields. To engineer a two-cell photosynthetic system in rice, the rice bundle sheath (BS) must be rewired to enhance photosynthetic capacity. Here, we show that BS chloroplast biogenesis is enhanced when the transcriptional activator, Oryza sativa Cytokinin GATA transcription factor 1 (OsCGA1), is driven by a vascular specific promoter.

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  • Imagined speech represents a promising approach in brain-computer interfaces, but existing methods struggle with feature extraction and require many trials for new classes.
  • This study aims to enhance classification performance and facilitate the addition of new classes with fewer trials using a novel deep metric learning framework.
  • The proposed method outperformed state-of-the-art techniques on two datasets, achieving notable accuracy while demonstrating that new classes can be effectively learned with limited trials, paving the way for more intuitive communication systems.
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We synthesized phenylboronic acid pinacol ester (PBPE)-conjugated hyaluronic acid (HA) via thiobis(ethylamine) (TbEA) linkage (abbreviated as HAsPBPE conjugates) to fabricate the radiosensitive delivery of caffeic acid phenetyl ester (CAPE) and for application in radioprotection. PBPE was primarily conjugated with TbEA and then PBPE-TbEA conjugates were conjugated again with hyaluronic acid using carbodiimide chemistry. CAPE-incorporated nanoparticles of HAsPBPE were fabricated by the nanoprecipitation method and then the organic solvent was removed by dialysis.

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Background: Gut microbiota closely communicate in the immune system to maintain a balanced immune homeostasis in the gastrointestinal tract of the host. Oral administration of probiotics modulates gut microbiota composition. In the present study, we isolated Lactobacillus rhamnosus HDB1258, which induced tumor necrosis factor (TNF)-α and interleukin (IL)-10 expression in macrophages, from the feces of breastfeeding infants and examined how HDB1258 could regulate the homeostatic immune response in mice with or without lipopolysaccharide (LPS)-induced systemic inflammation.

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  • The study investigated the impact of radiation doses on the gonads of children undergoing kidney nuclear medicine tests, emphasizing the need for careful management due to children's sensitivity to radiation.
  • Using Monte Carlo simulations, researchers measured radiation distribution and effects over time, finding that doses received by kidneys were slightly higher or lower than recommended by the International Commission on Radiation Protection (ICRP) depending on kidney function.
  • Results showed that gonads also received significant radiation doses, with values varying based on kidney health, illustrating the importance of monitoring radiation exposure in pediatric nuclear medicine.*
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  • * It introduces a novel metal artifact reduction (MAR) method using a fully convolutional network (FCN), involving metal trace segmentation and restoration processes in both sinogram and image domains.
  • * Results show that this new MAR method significantly improves image quality, reducing metal artifacts more effectively than existing algorithms without causing contrast anomalies.
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Bacteria exhibit cell-to-cell variability in their resilience to stress, for example, following antibiotic exposure. Higher resilience is typically ascribed to "dormant" non-growing cellular states. Here, by measuring membrane potential dynamics of Bacillus subtilis cells, we show that actively growing bacteria can cope with ribosome-targeting antibiotics through an alternative mechanism based on ion flux modulation.

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