60 research outputs found
Schwarz Lemma and Schwarz-Pick Lemma for solutions of the -harmonic equation
In this paper, the Schwarz type and Schwarz-Pick type inequalities for
solutions of -harmonic equation for are investigated. By
making use of the integral of trigonometric functions, we obtain the two types
of inequalities in terms of hypergeometric functions which improve the
corresponding results due to Khalfallah et al. (Complex Var. Elliptic Equ.,
2023) and Li et al. (Bull. Malays. Math. Sci. Soc., 2022).Comment: 14 pages, 1 figur
Enhanced Responsivity of Photodetectors Realized via Impact Ionization
To increase the responsivity is one of the vital issues for a photodetector. By employing ZnO as a representative material of ultraviolet photodetectors and Si as a representative material of visible photodetectors, an impact ionization process, in which additional carriers can be generated in an insulating layer at a relatively large electric field, has been employed to increase the responsivity of a semiconductor photodetector. It is found that the responsivity of the photodetectors can be enhanced by tens of times via this impact ionization process. The results reported in this paper provide a general route to enhance the responsivity of a photodetector, thus may represent a step towards high-performance photodetectors
Mesaconine alleviates doxorubicin-triggered cardiotoxicity and heart failure by activating PINK1-dependent cardiac mitophagy
Aberrant mitophagy has been identified as a driver for energy metabolism disorder in most cardiac pathological processes. However, finding effective targeted agents and uncovering their precise modulatory mechanisms remain unconquered. Fuzi, the lateral roots of Aconitum carmichaelii, shows unique efficacy in reviving Yang for resuscitation, which has been widely used in clinics. As a main cardiotonic component of Fuzi, mesaconine has been proven effective in various cardiomyopathy models. Here, we aimed to define a previously unrevealed cardioprotective mechanism of mesaconine-mediated restoration of obstructive mitophagy. The functional implications of mesaconine were evaluated in doxorubicin (DOX)-induced heart failure models. DOX-treated mice showed characteristic cardiac dysfunction, ectopic myocardial energy disorder, and impaired mitophagy in cardiomyocytes, which could be remarkably reversed by mesaconine. The cardioprotective effect of mesaconine was primarily attributed to its ability to promote the restoration of mitophagy in cardiomyocytes, as evidenced by elevated expression of PINK1, a key mediator of mitophagy induction. Silencing PINK1 or deactivating mitophagy could completely abolish the protective effects of mesaconine. Together, our findings suggest that the cardioprotective effects of mesaconine appear to be dependent on the activation of PINK1-induced mitophagy and that mesaconine may constitute a promising therapeutic agent for the treatment of heart failure
Association of single-nucleotide polymorphisms in the STAT3 gene with autoimmune thyroid disease in Chinese individuals
(S)-3-[(S)-5-(4-Fluorophenyl)-5-hydroxypentanoyl]-4-phenyloxazolidin-2-one 0.67-hydrate
The asymmetric unit of the title compound, 3C20H20FNO4·2H2O, consists of three (S)-3-[(S)-5-(4-fluorophenyl)-5-hydroxypentanoyl]-4-phenyloxazolidin-2-one molecules and two solvent water molecules. The carbonyl groups of the oxazolidin-2-one and hydroxypentanoyl units are oriented anti to one another in each molecule. In the crystal, O—H...O, C—H...O and C—H...F hydrogen bonds link the molecules into a three-dimensional supramolecular architecture with the organic molecules linked by water molecules and stacked along the b-axis direction
{(3S,5R)-5-(2,4-Difluorophenyl)-5-[(1H-1,2,4-triazol-1-yl)methyl]tetrahydrofuran-3-yl}methyl 4-methylbenzenesulfonate
In the title compound, C21H21F2N3O4S, the tetrahydrofuran ring adopts an envelope conformation with the β-C atom positioned at the flap. The triazole, difluorophenyl and tolyl rings of the various substituents on the tetrahydrofuran ring are inclined at 77.88 (12), 83.81 (10) and 81.00 (10)°, respectively, to the best-fit mean plane through the five atoms of the tetrahydrofuran ring. In the crystal, weak C—H...O and C—H...F hydrogen bonds link the molecules into a three-dimensional structure, with molecules stacked along the a-axis direction
Developing and validating a prognostic nomogram for ovarian clear cell carcinoma patients:A retrospective comparison of lymph node staging schemes with competing risk analysis
Purpose: Lymph node (LN) involvement is a key factor in ovarian clear cell carcinoma (OCCC) although, there several indicators can be used to define prognosis. This study examines the prognostic performances of each indicator for OCCC patients by comparing the number of lymph nodes examined (TNLE), the number of positive lymph nodes (PLN), lymph node ratio (LNR), and log odds of metastatic lymph nodes (LODDS). Methods: 1,300 OCCC patients who underwent lymphadenectomy between 2004 and 2015 were extracted from the Surveillance Epidemiology and End Results (SEER) database. Primary outcomes were Overall Survival (OS) and the cumulative incidence of Cancer-Specific Survival (CSS). Kaplan–Meier’s and Fine-Gray’s tests were implemented to assess OS and CSS rates. After conducting multivariate analysis, nomograms using OS and CSS were constructed based upon an improved LN system. Each nomograms’ performance was assessed using Receiver Operating Characteristics (ROC) curves, calibration curves, and the C-index which were compared to traditional cancer staging systems. Results: Multivariate Cox’s regression analysis was used to assess prognostic factors for OS, including age, T stage, M stage, SEER stage, and LODDS. To account for the CSS endpoint, a proportional subdistribution hazard model was implemented which suggested that the T stage, M stage, SEER stage, and LNR are all significant. This enabled us to develop a LODDS-based nomogram for OS and a LNR-based nomogram for CSS. C-indexes for both the OS and CSS nomograms were higher than the traditional American Joint Committee on Cancer (AJCC), 8th edition, staging system. Area Under the Curve (AUC) values for predicting 3- and 5-year OS and CSS between nomograms also highlighted an improvement upon the AJCC staging system. Calibration curves also performed with consistency, which was verified using a validation cohort. Conclusions: LODDS and LNR may be better predictors than N stage, TNLE, and PLNs. For OCCC patients, both the LODDS-based and LNR-based nomograms performed better than the AJCC staging system at predicting OS and CSS. However, further large sample, real-world studies are necessary to validate the assertion
DHC: Distributed, Hierarchical Clustering in Sensor Networks
In many sensor network applications, it is essential to get the data distribution of the attribute value over the network. Such data distribution can be got through clustering, which partitions the network into contiguous regions, each of which contains sensor nodes of a range of similar readings. This paper proposes a method named Distributed, Hierarchical Clustering (DHC) for online data analysis and mining in senior networks. Different from the acquisition and aggregation of raw sensory data, DHC clusters sensor nodes based on their current data values as well as their geographical proximity, and computes a summary for each cluster. Furthermore, these clusters, together with their summaries, are produced in a distributed, bottom-up manner. The resulting hierarchy of clusters and their summaries facilitates interactive data exploration at multiple resolutions. It can also be used to improve the efficiency of data-centric routing and query processing in sensor networks. We also design and evaluate the maintenance mechanisms for DHC to make it be able to work on evolving data. Our simulation results on real world datasets as well as synthetic datasets show the effectiveness and efficiency of our approach
Large Scale Two-Dimensional Flux-Closure Domain Arrays in Oxide Multilayers and Their Controlled Growth
Ferroelectric
flux-closures are very promising in high-density
storage and other nanoscale electronic devices. To make the data bits
addressable, the nanoscale flux-closures are required to be periodic
via a controlled growth. Although flux-closure quadrant arrays with
180° domain walls perpendicular to the interfaces (V-closure)
have been observed in strained ferroelectric PbTiO<sub>3</sub> films,
the flux-closure quadrants therein are rather asymmetric. In this
work, we report not only a periodic array of the symmetric flux-closure
quadrants with 180° domain walls parallel to the interfaces (H-closure)
but also a large scale alternative stacking of the V- and H-closure
arrays in PbTiO<sub>3</sub>/SrTiO<sub>3</sub> multilayers. On the
basis of a combination of aberration-corrected scanning transmission
electron microscopic imaging and phase field modeling, we establish
the phase diagram in the layer-by-layer two-dimensional arrays versus
the thickness ratio of adjacent PbTiO<sub>3</sub> films, in which
energy competitions play dominant roles. The manipulation of these
flux-closures may stimulate the design and development of novel nanoscale
ferroelectric devices with exotic properties
Bisindole Alkaloids with Neural Anti-inflammatory Activity from <i>Gelsemium elegans</i>
Three
new trace bisindole alkaloids geleganimines A and B (<b>1</b>, <b>2</b>) and geleganamide (<b>3</b>) were isolated
from the aerial parts of <i>Gelsemium elegans</i>. Their
structures were elucidated by spectroscopy, particularly from their
carbon–proton coupling constants, and electronic circular dichroism.
Compounds <b>1</b>–<b>3</b> are the first bisindole
alkaloids discovered from the genus <i>Gelsemium.</i> Geleganimine
B exhibited anti-inflammatory activity indirectly by suppressing lipopolysaccharide-induced
pro-inflammatory factors in BV2 microglial cells with an IC<sub>50</sub> value of 10.2 μM. These findings confirm the importance of
bioactive trace components in medicinal plant research
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