The authors have studied the temperature dependence of dielectric constants in Rb1-x(NH4)xH2AsO4 mixed crystals for x=0.35 and x=0.49. A Rb0.51(NH4)0.49H2AsO4 crystal was observed to show a diffuse anti-ferroelectric phase transition instead of the glass transition of the Rb1-x(NH4)xH2PO4 systems (0.22
Underwater acoustic communication has multipath error because of reflection by sea-level and sea-bottom. The multipath of UWA channel causes signal distortion and error floor. In this paper, we proposed the compensation method of multipath effect using the impulse response of the UWA channel. As shown in simulation results, the performance of proposed compensation method is better than the performance of conventional method.
Electrical transport properties of individual double‐wall carbon nanotube (DWNT) are studied. Negative differential conductance (NDC) was observed for the DWNT with a defected outer shell. Such NDC was explained in terms of the resonant tunneling through multiple quantum dots. Also observed is the Fano resonance for the low‐resistance samples. The Fano resonance was manifested by asymmetric peaks in the gate modulation and also by the zero‐bias peak in the differential conductance curve. Both NDC and Fano resonance in DWNT demonstrates the interplay of inner and outer shells via the inter‐shell hopping of electrons.
Extracts of ginseng species show antihyperglycemic activity. We evaluated the inhibitory effects of diabetic complications for Korean Red Ginseng (KRG), which is enriched in ginsenosides using Otsuka Long-Evans Tokushima Fatty (OLETF) rats. The animals were divided into one of four groups (n = 6∼9): Long-Evans-Tokushima-Otsuka rats (control rats), OLETF rats, rats given 200 mg/kg KRG, and rats given 400 mg/kg KRG. We examined the protective potential of KRG against type 2 diabetic illnesses. The results exhibited that KRG showed significant antihyperglycemic and antioxidative effects in KRG-treated OLETF rats. And, our results proposed the amelioration of cardiac function through normalized ejection fraction, fractional shortening, and vascular reactivity. Furthermore, histopathological abnormalities in the OLETF rats were prevented by KRG treatment.
Anti-inflammatory activity of rhein in animal models with potential mechanism of actions.Rhein was isolated from Cassia fistula L. flowers collected in Chennai, Tamil Nadu, India. Its anti-inflammatory activity was then investigated in Wistar rats and mice using carrageenan-induced hind paw oedema, croton oil-induced ear oedema, cotton pellet-induced granuloma and acetic acid-induced vascular permeability models.Administration of rhein (10, 20, 40 mg/kg) significantly (p < 0.05) inhibited carrageenan-induced paw oedema in rats and croton oil-induced ear oedema in mice in dose-dependent manners. Continual administration of rhein to rats using implanted cotton pellets significantly (p < 0.05) reduced granuloma formation (20 mg/kg: 17.24%; 40 mg/kg: 36.12%) compared to control group animals. Administration of rhein increased the activities of catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GSH-px) and decreased the levels of nitrite, interleukin-6 (IL-6), interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α), malondialdehyde (MDA) and vascular endothelial growth factor (VEGF) compared to control animals. Western blotting results revealed that rhein diminished carrageenan-induced cyclooxygenase (COX)-2 and inducible nitric oxide synthase (iNOS) and increased heme oxygenase (HO)-1, nuclear factor erythroid 2-related factor 2 (Nrf2), peroxisome proliferator-activated receptor gamma (PPAR)-γ and heat shock protein (HSP)-72 expression after 6 h in the paw oedema model.The anti-inflammatory mechanisms of rhein might be related to decrease in the levels of MDA, iNOS and COX-2 and the stimulation of HO-1, PPAR-γ and Nrf2 expression via increases in the activities of CAT, SOD and GSH-px through the suppression of nitrite, TNF-α, IL-6 and IL-1β.
The transverse dielectric constant of Rb 0.49 (NH 4 ) 0.51 H 2 AsO 4 , mixed crystals has been measured at temperatures ranging from room temperature to 17 K. ε ' 11 was observed to follow the Curie-Weiss law down to T * c =87.5 K, where the dielectric constant has a rounded peak. The reciprocal of ε ' 11 gives a Curie temperature of T 0 =-36 K, which may be indicative of a diffuse antiferroelectric phase transition rather than proton-glass freezing.
Fifty-nine Korean soybean (Glycine max L. Merr.) landrace accessions were tested for genotype fingerprinting, differentiation and association between morphological traits and SSR profile. Using 8 SSR loci, 59 varieties were divided into 55 groups, and only 4 pairs of varieties were not uniquely identified. The resolving power of SSR for soybean genotyping was much higher than that of the morphological traits that were studied. Identification efficiency also differed among SSR loci. Those loci with higher numbers of alleles distinguished varieties more effectively. Genetic differentiation values of the soybean landraces varied from 0.57 to 0.82 with a mean of 0.68. The number of alleles detected by the 8 loci ranged from 3 to 8, and the effective number of alleles ranged from 2.3 to 5.1. In a study of the association of SSR alleles with morphological traits, some alleles seemed to be related with some specific morphological traits. Comparison of two kinds of dendrograms which were derived from SSR markers and quantitative traits indicated that the dendrograms were not consistent. Considering the correlation between single SSR locus and qualitative traits governed by major genes, the data suggest that alleles of microsatellite loci be more closely related to some traits determined by major genes than those determined by minor genes.
BACKGROUND Escalating mental health concerns exacerbated by the coronavirus disease (COVID-19) and rapid societal shifts have made efficient monitoring of mental stress crucial. Chronic mental stress affects physical and psychological health, necessitating timely identification and intervention OBJECTIVE To explore the viability of vocal biomarkers in detecting stress levels among healthy Korean employees and to contribute to digital healthcare solutions. METHODS A multicenter clinical trial was conducted by collecting voice recordings of 113 healthy Korean employees under relaxed and stress-induced conditions. A deep learning architecture used for speaker identification was employed to develop stress prediction scores RESULTS The proposed model demonstrated an accuracy of 70% for stress detection. This highlights the potential of vocal biomarkers in digital healthcare to offer a convenient and effective means for individuals to self-monitor and manage their stress levels. CONCLUSIONS These findings underscore the potential of voice-based mental stress assessment among Koreans, emphasizing the importance of research on vocal biomarkers across linguistic demographics
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