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1.
FASEB J ; 38(7): e23600, 2024 Apr 15.
Artículo en Inglés | MEDLINE | ID: mdl-38572599

RESUMEN

Odontoblast differentiation depends on the orderly recruitment of transcriptional factors (TFs) in the transcriptional regulatory network. The depletion of crucial TFs disturbs dynamic alteration of the chromatin landscape and gene expression profile, leading to developmental defects. Our previous studies have revealed that the basic leucine zipper (bZIP) TF family is crucial in odontoblastic differentiation, but the function of bZIP TF family member XBP1 is still unknown. Here, we showed the stage-specific expression patterns of the spliced form Xbp1s during tooth development. Elevated Xbp1 expression and nuclear translocation of XBP1S in mesenchymal stem cells (MSCs) were induced by differentiation medium in vitro. Diminution of Xbp1 expression impaired the odontogenic differentiation potential of MSCs. The further integration of ATAC-seq and RNA-seq identified Hspa9 as a direct downstream target, an essential mitochondrial chaperonin gene that modulated mitochondrial homeostasis. The amelioration of mitochondrial dysfunction rescued the impaired odontogenic differentiation potential of MSCs caused by the diminution of Xbp1. Furthermore, the overexpression of Hspa9 rescued Xbp1-deficient defects in odontoblastic differentiation. Our study illustrates the crucial role of Xbp1 in odontoblastic differentiation via modulating mitochondrial homeostasis and brings evidence to the therapy of mitochondrial diseases caused by genetic defects.


Asunto(s)
Proteínas de la Matriz Extracelular , Células Madre Mesenquimatosas , Proteínas de la Matriz Extracelular/metabolismo , Diferenciación Celular , Factores de Transcripción/genética , Células Madre Mesenquimatosas/metabolismo , Homeostasis
2.
Nano Lett ; 24(5): 1761-1768, 2024 Feb 07.
Artículo en Inglés | MEDLINE | ID: mdl-38261791

RESUMEN

Colloidal quantum dots (QDs) are excellent luminescent nanomaterials for many optoelectronic applications. However, photoluminescence blinking has limited their practical use. Coupling QDs to plasmonic nanostructures shows potential in suppressing blinking. However, the underlying mechanism remains unclear and debated, hampering the development of bright nonblinking dots. Here, by deterministically coupling a QD to a plasmonic nanocavity, we clarify the mechanism and demonstrate unprecedented single-QD brightness. In particular, we report for the first time that a blinking QD could obtain nonblinking photoluminescence with a blinking lifetime through coupling to the nanocavity. We show that the plasmon-enhanced radiative decay outcompetes the nonradiative Auger process, enabling similar quantum yields for charged and neutral excitons in the same dot. Meanwhile, we demonstrate a record photon detection rate of 17 MHz from a colloidal QD, indicating an experimental photon generation rate of more than 500 MHz. These findings pave the way for ultrabright nonblinking QDs, benefiting diverse QD-based applications.

3.
Nat Mater ; 22(6): 684-695, 2023 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-36941390

RESUMEN

Antiferromagnets have attracted extensive interest as a material platform in spintronics. So far, antiferromagnet-enabled spin-orbitronics, spin-transfer electronics and spin caloritronics have formed the bases of antiferromagnetic spintronics. Spin transport and manipulation based on coherent antiferromagnetic dynamics have recently emerged, pushing the developing field of antiferromagnetic spintronics towards a new stage distinguished by the features of spin coherence. In this Review, we categorize and analyse the critical effects that harness the coherence of antiferromagnets for spintronic applications, including spin pumping from monochromatic antiferromagnetic magnons, spin transmission via phase-correlated antiferromagnetic magnons, electrically induced spin rotation and ultrafast spin-orbit effects in antiferromagnets. We also discuss future opportunities in research and applications stimulated by the principles, materials and phenomena of coherent antiferromagnetic spintronics.

4.
Nat Mater ; 22(9): 1106-1113, 2023 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-37537356

RESUMEN

Non-collinear antiferromagnets are an emerging family of spintronic materials because they not only possess the general advantages of antiferromagnets but also enable more advanced functionalities. Recently, in an intriguing non-collinear antiferromagnet Mn3Sn, where the octupole moment is defined as the collective magnetic order parameter, spin-orbit torque (SOT) switching has been achieved in seemingly the same protocol as in ferromagnets. Nevertheless, it is fundamentally important to explore the unknown octupole moment dynamics and contrast it with the magnetization vector of ferromagnets. Here we report a handedness anomaly in the SOT-driven dynamics of Mn3Sn: when spin current is injected, the octupole moment rotates in the opposite direction to the individual moments, leading to a SOT switching polarity distinct from ferromagnets. By using second-harmonic and d.c. magnetometry, we track the SOT effect onto the octupole moment during its rotation and reveal that the handedness anomaly stems from the interactions between the injected spin and the unique chiral-spin structure of Mn3Sn. We further establish the torque balancing equation of the magnetic octupole moment and quantify the SOT efficiency. Our finding provides a guideline for understanding and implementing the electrical manipulation of non-collinear antiferromagnets, which in nature differs from the well-established collinear magnets.

5.
Ann Hepatol ; 29(4): 101478, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38354949

RESUMEN

INTRODUCTION AND OBJECTIVES: Type 2 Diabetes Mellitus (T2DM), a prevalent metabolic disorder, often coexists with a range of complications, with retinopathy being particularly common. Recent studies have shed light on a potential connection between diabetic retinopathy (DR) and hepatic fibrosis, indicating a possible shared pathophysiological foundation in T2DM. This study investigates the correlation between retinopathy and hepatic fibrosis among individuals with T2DM, as well as evaluates the diagnostic value of DR for significant hepatic fibrosis. MATERIALS AND METHODS: Our cross-sectional analysis incorporated 5413 participants from the National Health and Nutrition Examination Survey (NHANES) 2005-2008. The Fibrosis-4 score (FIB-4) classified hepatic fibrosis into different grades (F0-F4), with significant hepatic fibrosis marked as F2 or higher. Retinopathy severity was determined using retinal imaging and categorized into four levels. The analysis of variance or Chi-square tests facilitated group comparisons. Additionally, the receiver operating characteristic (ROC) analysis appraised the predictive accuracy of retinopathy for significant hepatic fibrosis in the T2DM population. RESULTS: Among 5413 participants, the mean age was 59.56 ± 12.41, with 50.2% male. And 20.6% were diagnosed with T2DM. Hepatic fibrosis grading was positively associated with retinopathy severity (OR [odds ratio]: 1.521, 95%CI [confidence interval]: 1.152-2.008, P = 0.003) across the entire population. The association was amplified in the T2DM population according to Pearson's analysis results. The ROC curve demonstrated retinopathy's diagnostic capacity for significant hepatic fibrosis in the T2DM population (AUC [area under curve] = 0.72, 95%CI: 0.651-0.793, P < 0.001). CONCLUSIONS: Retinopathy could serve as an independent predictor of significant hepatic fibrosis in T2DM population. Ophthalmologists are advised to closely monitor T2DM patients with retinopathy.


Asunto(s)
Diabetes Mellitus Tipo 2 , Retinopatía Diabética , Cirrosis Hepática , Encuestas Nutricionales , Valor Predictivo de las Pruebas , Curva ROC , Índice de Severidad de la Enfermedad , Humanos , Masculino , Estudios Transversales , Cirrosis Hepática/diagnóstico , Cirrosis Hepática/complicaciones , Femenino , Persona de Mediana Edad , Retinopatía Diabética/diagnóstico , Retinopatía Diabética/epidemiología , Diabetes Mellitus Tipo 2/complicaciones , Anciano , Estados Unidos/epidemiología , Factores de Riesgo , Adulto , Área Bajo la Curva , Distribución de Chi-Cuadrado , Prevalencia
6.
Ann Surg Oncol ; 30(8): 5252-5263, 2023 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-37202570

RESUMEN

BACKGROUND: For patients with colorectal liver metastases (CRLM) who receive neoadjuvant therapy (NAT), reliable indicators that can early and accurately predict treatment response are lacking. This study was conducted to prospectively investigate the potential of early circulating tumor DNA (ctDNA) dynamics as a precise predictor of NAT response and recurrence in CRLM. METHODS: This study prospectively enrolled 34 patients with CRLM who received NAT, with blood samples collected and subjected to deep targeted panel sequencing at two time points: 1 day before the first and the second cycles of NAT. Correlations of ctDNA mean variant allele frequency (mVAF) dynamics and treatment response were assessed. The performance of early ctDNA dynamics in predicting treatment response was assessed and compared with those of carcinoembryonic antigen (CEA) and cancer antigen 19-9 (CA19-9). RESULTS: The baseline ctDNA mVAF was significantly associated with pre-NAT tumor diameter (r = 0.65; P < 0.0001). After one cycle of NAT, the ctDNA mVAF declined remarkably (P < 0.0001). The dynamic change in ctDNA mVAF of 50% or more was significantly correlated with better NAT responses. The discriminatory capacity of ctDNA mVAF changes was superior to that of CEA or CA19-9 in predicting radiologic response (area under the curve [AUC], 0.90 vs 0.71 vs 0.61) and pathologic tumor regression grade (AUC, 0.83 vs 0.64 vs 0.67). The early changes in ctDNA mVAF but not CEA or CA19-9 were an independent indicator of recurrence-free survival (RFS) (hazard ratio, 4.0; P = 0.023). CONCLUSIONS: For CRLM patients receiving NAT, an early ctDNA change is a superior predictor of treatment response and recurrence compared with conventional tumor markers.


Asunto(s)
ADN Tumoral Circulante , Neoplasias Colorrectales , Neoplasias Hepáticas , Humanos , ADN Tumoral Circulante/genética , Estudios Prospectivos , Antígeno CA-19-9 , Terapia Neoadyuvante , Pronóstico , Biomarcadores de Tumor/genética , Neoplasias Colorrectales/genética , Neoplasias Colorrectales/terapia , Neoplasias Hepáticas/genética , Neoplasias Hepáticas/terapia , Recurrencia Local de Neoplasia/genética , Recurrencia Local de Neoplasia/terapia
7.
Int J Colorectal Dis ; 38(1): 19, 2023 Jan 20.
Artículo en Inglés | MEDLINE | ID: mdl-36658235

RESUMEN

PURPOSE: This study aimed to explore the prognostic significance of clinicopathological characteristics in early-onset versus late-onset colorectal liver metastases (CRLM). METHODS: The data of CRLM patients who underwent hepatectomy from September 2010 to September 2020 were retrospectively analyzed. According to the age of primary cancer diagnosis, patients were divided into early-onset CRLM (EOCRLM) and late-onset CRLM (LOCRLM) groups. Clinicopathological parameters were compared between the two groups. Cox regression model and Kaplan-Meier method were used to analyze the effect of clinicopathological parameters on overall survival (OS) and recurrence-free survival (RFS). RESULTS: In total, 431 CRLM patients were identified, 130 with EOCRLM and 301 with LOCRLM. Compared with LOCRLM patients, EOCRLM patients had lower American Society of Anesthesia (ASA) grade and longer operation time (204 vs. 179 min). More aggressive features were presented in EOCRLM patients including synchronous liver metastases (76.9% vs. 61.1%) and bilobar involvement (43.8% vs. 33.2%). No significant difference in OS or RFS was found between the two groups. Multivariate analysis of EOCRLM group showed that preoperative CA19-9 level and RAS/BRAF status were predictive of OS, while bilobar involvement and preoperative CEA level were associated with RFS. In LOCRLM group, the number of CRLM, preoperative CA19-9 level, and BRAF status were associated with OS, while the number of CRLM was associated with RFS. CONCLUSIONS: The preoperative CA19-9 level, RAS/BRAF status, bilobar involvement, and preoperative CEA level were predictive of EOCRLM patient prognosis, while the number of CRLM, preoperative CA19-9 level, and BRAF status were predictive of LOCRLM patient prognosis.


Asunto(s)
Neoplasias Colorrectales , Neoplasias Hepáticas , Humanos , Pronóstico , Antígeno CA-19-9 , Proteínas Proto-Oncogénicas B-raf , Estudios Retrospectivos , Neoplasias Colorrectales/cirugía , Neoplasias Hepáticas/secundario , Hepatectomía
8.
J Surg Oncol ; 125(6): 991-1001, 2022 May.
Artículo en Inglés | MEDLINE | ID: mdl-35150441

RESUMEN

BACKGROUND: The clinicopathological and prognostic significance of human epidermal growth factor receptor 2 (HER2) status in surgically resected colorectal liver metastases (CRLM) remains uncertain. METHODS: HER2 expression was evaluated by immunohistochemical (IHC) in two CRLM tissue microarrays (TMAs). For samples with an IHC score of 2+ or 3+, fluorescence in situ hybridization (FISH) was performed to assess HER2 amplification. The association of HER2 amplification with clinicopathological parameters and prognosis was assessed using Fisher's exact test and Kaplan-Meier method, respectively. RESULTS: HER2 expression was consistent between primary tumor and liver metastases in 66.9% (85/127) cases (r = 0.643, p = 0.001). After FISH validation, HER2 amplification was identified in 6.25% (13/208) patients. HER2 amplification was significantly associated with age (p = 0.017), bilobar involvement (p = 0.005) and left-sided RAS/RAF wild-type status (p = 0.002). In the overall cohort, HER2 amplification was correlated with significantly worse relapse-free survival (RFS). Further stratification revealed that among left-sided RAS/RAF wild-type cases, HER2 amplification was significantly associated with worse overall survival (OS) (30.2 vs. 50.9 months, p = 0.040) and RFS (5.77 vs. 19.97 months, p = 0.017). CONCLUSION: HER2 amplification is more enriched in CRLMs with younger age, left-sided RAS/RAF wild-type, and bilobar involvement. Moreover, HER2 amplification predicts a poorer prognosis especially in left-sided RAS/RAF wild-type CRLMs.


Asunto(s)
Neoplasias Colorrectales , Neoplasias Hepáticas , Neoplasias Colorrectales/genética , Neoplasias Colorrectales/cirugía , Amplificación de Genes , Humanos , Hibridación Fluorescente in Situ , Neoplasias Hepáticas/genética , Neoplasias Hepáticas/secundario , Neoplasias Hepáticas/cirugía , Pronóstico , Receptor ErbB-2/metabolismo
9.
Nanotechnology ; 33(42)2022 Jul 29.
Artículo en Inglés | MEDLINE | ID: mdl-35820407

RESUMEN

EDIL3 is a strong and highly accurate diagnostic marker for breast cancer, meanwhile, EDIL3 overexpressed exosomes are novel biomarkers for the early diagnosis of triple-negative breast cancer (TNBC). Here, we proposed a fluorescent detection method for EDIL3 overexpressed exosomes, which is simple and sensitive. Basically, we utilized a magnetic nanospheres (MNS) based liquid sandwich immunoassay strategy. MNS were modified with CD63 aptamers, which can immunologically bound to the CD63 protein on the surface of exosomes. Alexa Fluor 647 labeled anti-EDIL3 antibodies (Anti-EDIL3/AF647) were used as the fluorescent probes to recognize the EDIL3 on exosomes derived from a TNBC cell line (MDA-MB-231). With the target TNBC exosomes present, sandwich structures containing MNS, exosomes and fluorescent probes were formed. After magnetic purification, optical super resolution imaging of the products was conducted to check the specificity of the assay. In addition, fluorescence signals of the products were detected to quantitatively analyze the EDIL3 overexpressed exosomes. The linear range was found to be 7.78 × 101to 7.78× 106particlesµl-1. The detection limit was approximately 10 particlesµl-1. The feasibility of the method for the detection of exosomes in complex biological samples was also demonstrated. Such a simple and sensitive detection method for EDIL3 overexpressed exosomes holds a great potential in clinical diagnosis of TNBC.


Asunto(s)
Exosomas , Neoplasias de la Mama Triple Negativas , Proteínas de Unión al Calcio/análisis , Proteínas de Unión al Calcio/metabolismo , Moléculas de Adhesión Celular/análisis , Moléculas de Adhesión Celular/metabolismo , Línea Celular Tumoral , Exosomas/química , Colorantes Fluorescentes/análisis , Humanos , Inmunoensayo , Imagen Óptica , Neoplasias de la Mama Triple Negativas/diagnóstico , Neoplasias de la Mama Triple Negativas/metabolismo
10.
Nano Lett ; 21(16): 7037-7043, 2021 Aug 25.
Artículo en Inglés | MEDLINE | ID: mdl-34374550

RESUMEN

Unequal transmissions of spin waves along opposite directions provide useful functions for signal processing. So far, the realization of such nonreciprocal spin waves has been mostly limited at a gigahertz frequency in the coherent regime via microwave excitation. Here we show that, in a magnetic bilayer stack with chiral coupling, tunable nonreciprocal propagation can be realized in spin Hall effect-excited incoherent magnons, whose frequencies cover the spectrum from a few gigahertz up to terahertz. The sign of nonreciprocity is controlled by the magnetic orientations of the bilayer in a nonvolatile manner. The nonreciprocity is further verified by measurements of the magnon diffusion length, which is unequal along opposite transmission directions. Our findings enrich the knowledge on magnetic relaxation and diffusive transport and can lead to the design of a passive directional signal isolation device in the diffusive regime.

11.
J Surg Oncol ; 124(8): 1431-1441, 2021 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-34406653

RESUMEN

BACKGROUND: This study investigated the correlation between tumor regression grade (TRG) score and Immunoscore, and prognostic values of TRG score and a risk score in colorectal cancer liver metastases (CRLMs) patients after neoadjuvant chemotherapy. METHODS: Patients undergoing neoadjuvant chemotherapy from 2014 to 2019 were selected. TRG score and Immunoscore were evaluated in 200 CRLMs. A risk score combining TRG score, Immunoscore, and clinical risk score (CRS) was defined and divided patients into the low-, medium-, and high-risk groups. Differences in relapse-free survival (RFS) and overall survival (OS) between groups were determined. RESULTS: The densities of CD3+ and CD8+ immune cells were higher in TRG1-3 group than in TRG4-5 group, and the ratio of high Immunoscores was higher in TRG1-3 group than in TRG4-5 group (60.0% vs. 15.8%, p < 0.001). Patients in TRG1-3 group had significantly longer RFS and OS than those in TRG4-5 group. The low-risk group shows a significantly higher 2-year RFS and 5-year OS rate than the medium- and high-risk group (RFS: 59.9%, 36.2%, and 6.4%, p < 0.001; OS: 82.0%, 41.0%, and 16.9%, p < 0.001). CONCLUSION: TRG score may be proposed to evaluate the prognosis of neoadjuvant chemotherapy and may be used for predicting the postoperative survival of CRLMs.


Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Biomarcadores/análisis , Neoplasias Colorrectales/patología , Neoplasias Hepáticas/secundario , Terapia Neoadyuvante/métodos , Neoplasias Colorrectales/tratamiento farmacológico , Neoplasias Colorrectales/inmunología , Femenino , Estudios de Seguimiento , Humanos , Neoplasias Hepáticas/tratamiento farmacológico , Neoplasias Hepáticas/inmunología , Masculino , Persona de Mediana Edad , Pronóstico , Tasa de Supervivencia
13.
Phys Rev Lett ; 121(5): 057701, 2018 Aug 03.
Artículo en Inglés | MEDLINE | ID: mdl-30118301

RESUMEN

Owing to the difficulty in detecting and manipulating the magnetic states of antiferromagnetic materials, studying their switching dynamics using electrical methods remains a challenging task. By employing heavy-metal-rare-earth-transition-metal alloy bilayers, we experimentally study current-induced domain wall dynamics in an antiferromagnetically coupled system. We show that the current-induced domain wall mobility reaches a maximum at the angular momentum compensation point. With experiment and modeling, we further reveal the internal structures of domain walls and the underlying mechanisms for their fast motion. We show that the chirality of the ferrimagnetic domain walls remains the same across the compensation points, suggesting that spin orientations of specific sublattices rather than net magnetization determine Dzyaloshinskii-Moriya interaction in heavy-metal-ferrimagnet bilayers. The high current-induced domain wall mobility and the robust domain wall chirality in compensated ferrimagnetic material opens new opportunities for high-speed spintronic devices.

14.
Phys Rev Lett ; 119(7): 077702, 2017 Aug 18.
Artículo en Inglés | MEDLINE | ID: mdl-28949690

RESUMEN

The strongly spin-momentum coupled electronic states in topological insulators (TI) have been extensively pursued to realize efficient magnetic switching. However, previous studies show a large discrepancy of the charge-spin conversion efficiency. Moreover, current-induced magnetic switching with TI can only be observed at cryogenic temperatures. We report spin-orbit torque switching in a TI-ferrimagnet heterostructure with perpendicular magnetic anisotropy at room temperature. The obtained effective spin Hall angle of TI is substantially larger than the previously studied heavy metals. Our results demonstrate robust charge-spin conversion in TI and provide a direct avenue towards applicable TI-based spintronic devices.

15.
Sci Total Environ ; 914: 169992, 2024 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-38215852

RESUMEN

Land surface temperature (LST) is a crucial parameter in the circulation of water, exchange of land-atmosphere energy, and turbulence. Currently, most LST products rely heavily on thermal infrared remote sensing, which is susceptible to cloud and rain interference, leading to inferior temporal continuity. Microwave remote sensing has the advantage of being available "all-weather" due to strong penetration capability, which provides the possibility to simulate time-continuous LST data. In addition, the continuous increase in high-density station observations (>10,000 stations) provides reliable measured data for the remote sensing monitoring of LST in China. This study aims to adopt the "Earth big data" generated from high-density station observation and microwave remote sensing data to monitor LST based on deep learning (U-Net family) for the first time. Given the significant spatial and temporal variability of LST and its sensitivity to various factors according to radiation transmission equations, this study incorporated climatic, anthropogenic, geographical, and vegetation datasets to facilitate a multi-source data fusion approach for LST estimation. The results showed that the U-Net++ model with modified skip connections better minimized the semantic discrepancy between the feature maps of the encoder and decoder subnetworks for 0.1° daily LST mapping across China than the U-Net and U2-Net deep learning models. The accuracy of the LST simulation exhibited favorable outcomes in the spatial and temporal dimensions. The station density met the requirements of monitoring air-ground integration monitoring in China. Additionally, the temporal change in the simulation accuracy fluctuated in a W-shape owing to the limited simulation capability of deep learning in extreme scenarios. Anthropogenic factors had the largest influence on LST changes in China, followed by climate, geography, and vegetation. This study highlighted the application of deep learning in remote sensing monitoring against the background of "big data" and provided a scientific foundation for the response of climate change to human activities, ecological environmental protection, and sustainable social and economic development.

16.
Adv Healthc Mater ; 13(16): e2400241, 2024 06.
Artículo en Inglés | MEDLINE | ID: mdl-38456344

RESUMEN

Pancreatic cancer is a highly malignant and metastatic cancer. Pancreatic cancer can lead to liver metastases, gallbladder metastases, and duodenum metastases. The identification of pancreatic cancer cells is essential for the diagnosis of metastatic cancer and exploration of carcinoma in situ. Organelles play an important role in maintaining the function of cells, the various cells show significant differences in organelle microenvironment. Herein, six probes are synthesized for targeting mitochondria, lysosomes, cell membranes, endoplasmic reticulum, Golgi apparatus, and lipid droplets. The six fluorescent probes form an organelles-targeted sensor array (OT-SA) to image pancreatic metastatic cancer cells and cell spheroids. The homology of metastatic cancer cells brings the challenge for identification of these cells. The residual network (ResNet) model has been proven to automatically extract and select image features, which can figure out a subtle difference among similar samples. Hence, OT-SA is developed to identify pancreatic metastasis cells and cell spheroids in combination with ResNet analysis. The identification accuracy for the pancreatic metastasis cells (> 99%) and pancreatic metastasis cell spheroids (> 99%) in the test set is successfully achieved respectively. The organelles-targeting sensor array provides a method for the identification of pancreatic cancer metastasis in cells and cell spheroids.


Asunto(s)
Orgánulos , Neoplasias Pancreáticas , Esferoides Celulares , Neoplasias Pancreáticas/patología , Neoplasias Pancreáticas/metabolismo , Esferoides Celulares/metabolismo , Esferoides Celulares/patología , Humanos , Línea Celular Tumoral , Orgánulos/metabolismo , Colorantes Fluorescentes/química , Metástasis de la Neoplasia
17.
Heliyon ; 10(7): e27993, 2024 Apr 15.
Artículo en Inglés | MEDLINE | ID: mdl-38560108

RESUMEN

Objective: To establish a Bama minipigs model with Non-Alcoholic Fatty Liver (NAFL) induced by a high-fat diet and investigate the application of attenuation coefficient (ATT) and ultrasound-derived fat fraction (UDFF) in the diagnosis of NAFL. Methods: Six-month-old male Bama minipigs were randomly divided into normal control and high-fat groups (n = 3 pigs per group), and fed with a control diet and high-fat diet for 32 weeks. Weight and body length were measured every four weeks, followed by quantitative ultrasound imaging (ATT and UDFF), blood biochemical markers, and liver biopsies on the same day. Using the Non-Alcoholic Fatty Liver Disease (NAFLD) Activity Score (NAS) as a reference, we analyzed the correlation between ATT, UDFF, and their score results. Results: Compared with the normal control group, the body weight, body mass index (BMI), and serum levels of triglyceride (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C) in the High-fat group were significantly different at Week 12 (P < 0.05). Spearman correlation analysis showed that the ATT value was significantly correlated with NAS score (r = 0.76, P < 0.001), and the UDFF value was significantly correlated with NAS score (r = 0.80, P < 0.001). The optimal cut-off value of ATT and UDFF were 0.59 dB/cm/MHz and 5.5%, respectively. These values are optimal for diagnosis of NAFL in Bama minipig model. Conclusion: ATT and UDFF have a high correlation with steatosis, and can be used as a non-invasive method for early screening of hepatic steatosis, which can dynamically monitor the change of disease course.

18.
PLoS One ; 18(3): e0282602, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36867654

RESUMEN

Aiming at the comfort evaluation of automobile intelligent cockpit, an evaluation model based on improved combination weighting-cloud model is established. By consulting relevant literature, 4 first-class indexes and 15 second-class indexes, including noise and vibration, light environment, thermal environment and human-computer interaction, are selected to establish a comfort evaluation system. Later the subjective and objective weights obtained by improved Analytic Hierarchy Process (AHP) and Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) are combined by Game Theory. Considering the fuzziness and randomness of the index system, the combination weights obtained by Game Theory are combined with the cloud model. The floating cloud algorithms is used to determine the first-class and second-class index clouds and the comprehensive evaluation cloud parameters. Improvements were made in two commonly used similarity calculation methods, the expectation curve method (ECM) and the maximum boundary curve method (MCM). A new similarity calculation method is defined to optimize the evaluation results and determine the final comfort evaluation grade. Lastly, a 2021 Audi intelligent car under a certain working condition was selected to verify the correctness and rationality of the model using the fuzzy evaluation method. The results show that the cockpit comfort evaluation model based on the improved combination weighting-cloud model can better reflect the comprehensive comfort of automobile cockpit.


Asunto(s)
Algoritmos , Automóviles , Humanos , Proceso de Jerarquía Analítica , Teoría del Juego , Inteligencia
19.
PeerJ Comput Sci ; 9: e1506, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37705635

RESUMEN

It is important to be able to measure the similarity between two uncertain concepts for many real-life AI applications, such as image retrieval, collaborative filtering, risk assessment, and data clustering. Cloud models are important cognitive computing models that show promise in measuring the similarity of uncertain concepts. Here, we aim to address the shortcomings of existing cloud model similarity measurement algorithms, such as poor discrimination ability and unstable measurement results. We propose an EPTCM algorithm based on the triangular fuzzy number EW-type closeness and cloud drop variance, considering the shape and distance similarities of existing cloud models. The experimental results show that the EPTCM algorithm has good recognition and classification accuracy and is more accurate than the existing Likeness comparing method (LICM), overlap-based expectation curve (OECM), fuzzy distance-based similarity (FDCM) and multidimensional similarity cloud model (MSCM) methods. The experimental results also demonstrate that the EPTCM algorithm has successfully overcome the shortcomings of existing algorithms. In summary, the EPTCM method proposed here is effective and feasible to implement.

20.
PeerJ Comput Sci ; 9: e1324, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37346597

RESUMEN

With the rapid development of the automobile industry, the comfort of the cockpit has become the standard for judging the quality of the car. People have also put forward higher requirements for cockpit comfort. In the process of driving, the cockpit environment will constantly change, and the comfort will also change. When the comprehensive comfort level of the cockpit decreases and the occupants feel uncomfortable, the cockpit comfort should be adjusted. In this article, a cockpit comfort evaluation model is established to realize the evaluation of cockpit comfort. In addition, we elaborate the theory of optimal state distance, where the numerical magnitude of the optimal state distance is used to reflect the extent to which an indicator deviates from its optimal state. Also, a cockpit optimal adjustment strategy identification model is established based on the theory, which can obtain the optimal adjustment strategy in a certain cockpit operating environment, facilitate the timely adjustment of the corresponding actuator, and realize the dynamic monitoring and adjustment of cockpit comfort. This project provides a reference direction for cockpit comfort adjustment, which is of great significance for future research and development of automotive cockpit comfort.

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