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1.
Am J Physiol Endocrinol Metab ; 326(6): E856-E868, 2024 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-38656128

RESUMEN

Chronic pancreatitis (CP) is a progressive inflammatory disease with an increasing global prevalence. In recent years, a strong association between CP and metabolic bone diseases (MBDs), especially osteoporosis, has been identified, attracting significant attention in the research field. Epidemiological data suggest a rising trend in the incidence of MBDs among CP patients. Notably, recent studies have highlighted a profound interplay between CP and altered nutritional and immune profiles, offering insights into its linkage with MBDs. At the molecular level, CP introduces a series of biochemical disturbances that compromise bone homeostasis. One critical observation is the disrupted metabolism of vitamin D and vitamin K, both essential micronutrients for maintaining bone integrity, in CP patients. In this review, we provide physio-pathological perspectives on the development and mechanisms of CP-related MBDs. We also outline some of the latest therapeutic strategies for treating patients with CP-associated MBDs, including stem cell transplantation, monoclonal antibodies, and probiotic therapy. In summary, CP-associated MBDs represent a rising medical challenge, involving multiple tissues and organs, complex disease mechanisms, and diverse treatment approaches. More in-depth studies are required to understand the complex interplay between CP and MBDs to facilitate the development of more specific and effective therapeutic approaches.


Asunto(s)
Enfermedades Óseas Metabólicas , Pancreatitis Crónica , Humanos , Pancreatitis Crónica/epidemiología , Pancreatitis Crónica/metabolismo , Pancreatitis Crónica/complicaciones , Enfermedades Óseas Metabólicas/epidemiología , Enfermedades Óseas Metabólicas/etiología , Enfermedades Óseas Metabólicas/metabolismo , Vitamina D/metabolismo , Vitamina D/uso terapéutico , Vitamina K/metabolismo , Animales
2.
World J Surg Oncol ; 22(1): 117, 2024 May 03.
Artículo en Inglés | MEDLINE | ID: mdl-38698475

RESUMEN

BACKGROUND AND AIMS: The prevalence of metabolic dysfunction-associated fatty liver disease (MAFLD) in hepatocellular carcinoma (HCC) patients is increasing, yet its association with postoperative complications of HCC remains unclear. The aim of this study was to investigate the impact of MAFLD on complications after radical resection in HCC patients. METHODS: Patients with HCC who underwent radical resection were included. Patients were stratified into MAFLD group and non-MAFLD group. Clinical features and post-hepatectomy complications were compared between the two groups, and logistic regression analysis was used to determine independent risk factors associated with post-hepatectomy complications. RESULTS: Among the 936 eligible patients with HCC who underwent radical resection, concurrent MAFLD was diagnosed in 201 (21.5%) patients. Compared to the non-MAFLD group, the MAFLD group exhibited a higher incidence of complications, including infectious and major complications after radical resection in HCC patients. The logistic regression analysis found that MAFLD was an independent risk factor for complications, including infectious and major complications in HCC patients following radical resection (OR 1.565, 95%CI 1.109-2.343, P = 0.012; OR 2.092, 95%CI 1.386-3.156, P < 0.001; OR 1.859, 95% CI 1.106-3.124, P = 0.019; respectively). Subgroup analysis of HBV-related HCC patients yielded similar findings, and MAFLD patients with type 2 diabetes mellitus (T2DM) exhibited a higher incidence of postoperative complications compared to those without T2DM (all P < 0.05). CONCLUSIONS: Concurrent MAFLD was associated with an increased incidence of complications after radical resection in patients with HCC, especially MAFLD with T2DM.


Asunto(s)
Carcinoma Hepatocelular , Hepatectomía , Neoplasias Hepáticas , Complicaciones Posoperatorias , Humanos , Carcinoma Hepatocelular/cirugía , Carcinoma Hepatocelular/patología , Carcinoma Hepatocelular/virología , Masculino , Neoplasias Hepáticas/cirugía , Neoplasias Hepáticas/patología , Femenino , Complicaciones Posoperatorias/etiología , Complicaciones Posoperatorias/epidemiología , Persona de Mediana Edad , Hepatectomía/efectos adversos , Factores de Riesgo , Estudios de Seguimiento , Pronóstico , Estudios Retrospectivos , Hígado Graso/etiología , Hígado Graso/epidemiología , Hígado Graso/complicaciones , Hígado Graso/metabolismo , Hígado Graso/patología , Anciano , Incidencia
3.
Biomacromolecules ; 24(7): 3171-3183, 2023 07 10.
Artículo en Inglés | MEDLINE | ID: mdl-37326596

RESUMEN

To achieve osteogenesis, angiogenesis, and neurogenesis for repairing bone defects, we constructed an anisotropic microspheres-cryogel composite loaded with magnesium l-threonate (MgT). These composites were prepared by the photo-click reaction of norbornene-modified gelatin (GB) in the presence of MgT-loaded microspheres through the bidirectional freezing method. The composites possessed an anisotropic macroporous (around 100 µm) structure and sustained release of bioactive Mg2+, which facilitate vascular ingrowth. These composites could significantly promote osteogenic differentiation of bone marrow mesenchymal stem cells, tubular formation of human umbilical vein vessel endothelial cells, and neuronal differentiation in vitro. Additionally, these composites significantly promoted early vascularization and neurogenesis as well as bone regeneration in the rat femoral condyle defects. In conclusion, owing to the anisotropic macroporous microstructure and bioactive MgT, these composites could simultaneously promote bone, blood vessel, and nerve regeneration, showing great potential for bone tissue engineering.


Asunto(s)
Criogeles , Osteogénesis , Ratas , Humanos , Animales , Criogeles/química , Magnesio/farmacología , Microesferas , Regeneración Ósea , Diferenciación Celular , Neurogénesis , Células Endoteliales de la Vena Umbilical Humana , Andamios del Tejido/química
4.
Analyst ; 148(23): 5790-5804, 2023 Nov 20.
Artículo en Inglés | MEDLINE | ID: mdl-37855707

RESUMEN

Ensuring food safety is a critical concern for the development and well-being of humanity, as foodborne illnesses caused by foodborne bacteria have increasingly become a major public health concern worldwide. Traditional food safety monitoring systems are expensive and time-consuming, relying heavily on specialized equipment and operations. Therefore, there is an urgent need to develop low-cost, user-friendly and highly sensitive biosensors for detecting foodborne bacteria. In recent years, the combination of nanomaterials with optical biosensors has provided a prospective future platform for the detection of foodborne bacteria. By harnessing the unique properties of nanomaterials, such as their high surface area-to-volume ratio and exceptional sensitivity, in tandem with the precision of optical biosensing techniques, a new prospect has opened up for the rapid and accurate identification of potential bacterial contaminants in food. This review focuses on recent advances and new trends of nanomaterial-based biosensors for the detection of foodborne pathogens, which mainly include noble metal nanoparticles (NMPs), metal organic frameworks (MOFs), graphene nanomaterials, quantum dot (QD) nanomaterials, upconversion fluorescent nanomaterials (UCNPs) and carbon dots (CDs). Additionally, we summarized the research progress of color indicators, nanozymes, natural enzyme vectors and fluorescent dye biosensors, focusing on the advantages and disadvantages of nanomaterial-based biosensors and their development prospects. This review provides an outlook on future technological directions and potential applications to help identify the most promising areas of development in this field.


Asunto(s)
Técnicas Biosensibles , Enfermedades Transmitidas por los Alimentos , Nanoestructuras , Humanos , Inocuidad de los Alimentos , Técnicas Biosensibles/métodos , Bacterias
5.
Inorg Chem ; 62(28): 10881-10886, 2023 Jul 17.
Artículo en Inglés | MEDLINE | ID: mdl-37413971

RESUMEN

Metal phosphonate frameworks (MPFs) consisting of tetravalent metal ions and aryl-phosphonate ligands feature a large affinity for actinides and excellent stabilities in harsh aqueous environments. However, it remains elusive how the crystallinity of MPFs influences their performance in actinide separation. To this end, we prepared a new category of porous, ultrastable MPF with different crystallinities for uranyl and transuranium separation. The results demonstrated that crystalline MPF was generally a better adsorbent for uranyl than the amorphous counterpart and ranked as the top-performing one for uranyl and plutonium in strong acidic solutions. A plausible uranyl sequestration mechanism was unveiled by using powder X-ray diffraction in tandem with vibrational spectroscopy, thermogravimetry, and elemental analysis.

6.
Hepatobiliary Pancreat Dis Int ; 22(4): 366-372, 2023 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-35466065

RESUMEN

BACKGROUND: Metabolic dysfunction-associated fatty liver disease (MAFLD) is recently proposed an entity by a group of international experts. However, the impact of MAFLD on the prognosis of patients with hepatocellular carcinoma (HCC) is not clear. The aim of this study was to explore the influence of MAFLD for the prognosis of HCC after radical resection. METHODS: HCC patients who received radical resection were enrolled. The recurrence-free survival (RFS) and overall survival (OS) were compared between MAFLD and non-MAFLD. RESULTS: A total of 576 HCC patients were included, and among them 114 (19.8%) met the diagnostic criteria of MAFLD. The median RFS was 34.0 months in the MAFLD group and 19.0 months in the non-MAFLD group. The 1-, 3-, and 5-year RFS rates were 64.9%, 49.1% and 36.1% in the MAFLD group, which were higher than those of the non-MAFLD group (59.4%, 35.3% and 26.5%, respectively, P = 0.01). The mean OS was 57.0 months in the MAFLD group and 52.2 months in the non-MAFLD group. There was no statistical difference in OS rate between the MAFLD group and non-MAFLD group. Similar results were found in HBV-related HCC patients in the subgroup analysis. Univariate analysis revealed that MAFLD was a protective factor for RFS in HCC patients after radical resection (P < 0.05), and there was no association between MAFLD and OS rate (P > 0.05). Multivariate analysis demonstrated that MAFLD was not an independent protective factor for HCC patients with radical resection. CONCLUSIONS: MAFLD improves RFS rate in HCC patients with radical resection, but is not an independent protective factor and not associated with OS rate.


Asunto(s)
Carcinoma Hepatocelular , Neoplasias Hepáticas , Humanos , Carcinoma Hepatocelular/patología , Neoplasias Hepáticas/patología , Estudios Retrospectivos , Pronóstico , Hepatectomía/efectos adversos
7.
Int J Mol Sci ; 24(3)2023 Feb 03.
Artículo en Inglés | MEDLINE | ID: mdl-36769323

RESUMEN

Ulcerative colitis (UC) is a chronic recurrent inflammatory illness of the gastrointestinal system. The purpose of this study was to explore the alleviating effect of vitamin K2 (VK2) on UC, as well as its mechanism. C57BL/6J mice were given 3% DSS for seven days to establish UC, and they then received VK2 (15, 30, or 60 mg/kg·bw) and 5-aminosalicylic acid (100 mg/kg·bw) for two weeks. We recorded the clinical signs, body weights, colon lengths, and histological changes during the experiment. We detected the inflammatory factor expressions using enzyme-linked immunosorbent assay (ELISA) kits, and we detected the tight junction proteins using Western blotting. We analyzed the intestinal microbiota alterations and short-chain fatty acids (SCFAs) using 16S rRNA sequencing and targeted metabolomics. According to the results, VK2 restored the colon lengths, improved the colonic histopathology, reduced the levels of proinflammatory cytokines (such as IL-1ß, TNF-α, and IL-6), and boosted the level of the immunosuppressive cytokine IL-10 in the colon tissues of the colitis mice. Moreover, VK2 promoted the expression of mucin and tight junction proteins (such as occludin and zonula occludens-1) in order to preserve the intestinal mucosal barrier function and prevent UC in mice. Additionally, after the VK2 intervention, the SCFAs and SCFA-producing genera, such as Eubacterium_ruminantium_group and Faecalibaculum, were elevated in the colon. In conclusion, VK2 alleviated the DSS-induced colitis in the mice, perhaps by boosting the dominant intestinal microflora, such as Faecalibaculum, by reducing intestinal microflora dysbiosis, and by modulating the expression of SCFAs, inflammatory factors, and intestinal barrier proteins.


Asunto(s)
Colitis Ulcerosa , Colitis , Ratones , Animales , Colitis Ulcerosa/inducido químicamente , Colitis Ulcerosa/tratamiento farmacológico , Colitis Ulcerosa/metabolismo , Sulfato de Dextran/toxicidad , Vitamina K 2/metabolismo , ARN Ribosómico 16S/metabolismo , Ratones Endogámicos C57BL , Colitis/patología , Colon/patología , Citocinas/metabolismo , Proteínas de Uniones Estrechas/metabolismo , Firmicutes/metabolismo , Modelos Animales de Enfermedad
8.
J Pak Med Assoc ; 73(4): 796-799, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-37051986

RESUMEN

OBJECTIVE: To provide a normative palpebral database for the Uygur subjects to determine norms that may contribute to the diagnosis and prognosis of eyelid diseases. Methods: The cross-sectional study was conducted from March to May 2021 at the First People's Hospital of Kashi, China, and comprised Uygur subjects of either gender aged 18-70 years. The slant, height and width of the palpebral fissure, vertical brow-upper lid distance, intercanthal distance, pupillary distance, brow height, crease height and levator function were measured. Data was analysed using SPSS 22. RESULTS: Of the 335 subjects having mean age 41.41±14.53 years, 165(49.3%) were males with mean age 41.08±14.23 years and 170(50.7%) were females with mean age 41.74±14.85 years. There were 107(31.9%) subjects aged 18-30 years, 115(34.3%) aged 31-50 years and 113(33.7%) aged 51-70 years. Mean palpebral fissure width and margin reflex distance of the palpebrae were significantly different in terms of gender (p<0.05). Age was also a significant factor on several counts (p<0.05). Conclusion: Anthropometric measurements of eyelid in Uygur subjects indicated certain peculiarities.


Asunto(s)
Párpados , Masculino , Femenino , Humanos , Adulto , Persona de Mediana Edad , Estudios Transversales , Párpados/anatomía & histología , Pronóstico , Antropometría , China/epidemiología
9.
Entropy (Basel) ; 25(2)2023 Feb 04.
Artículo en Inglés | MEDLINE | ID: mdl-36832660

RESUMEN

Currently, the most widely used protocol for the transportation layer of computer networks for reliable transportation is the Transmission Control Protocol (TCP). However, TCP has some problems such as high handshake delay, head-of-line (HOL) blocking, and so on. To solve these problems, Google proposed the Quick User Datagram Protocol Internet Connection (QUIC) protocol, which supports 0-1 round-trip time (RTT) handshake, a congestion control algorithm configuration in user mode. So far, the QUIC protocol has been integrated with traditional congestion control algorithms, which are not efficient in numerous scenarios. To solve this problem, we propose an efficient congestion control mechanism on the basis of deep reinforcement learning (DRL), i.e., proximal bandwidth-delay quick optimization (PBQ) for QUIC, which combines traditional bottleneck bandwidth and round-trip propagation time (BBR) with proximal policy optimization (PPO). In PBQ, the PPO agent outputs the congestion window (CWnd) and improves itself according to network state, and the BBR specifies the pacing rate of the client. Then, we apply the presented PBQ to QUIC and form a new version of QUIC, i.e., PBQ-enhanced QUIC. The experimental results show that the proposed PBQ-enhanced QUIC achieves much better performance in both throughput and RTT than existing popular versions of QUIC, such as QUIC with Cubic and QUIC with BBR.

10.
Circ Res ; 126(12): 1706-1720, 2020 06 05.
Artículo en Inglés | MEDLINE | ID: mdl-32212953

RESUMEN

RATIONALE: The stress response of heart rate, which is determined by the plasticity of the sinoatrial node (SAN), is essential for cardiac function and survival in mammals. As an RNA-binding protein, CIRP (cold-inducible RNA-binding protein) can act as a stress regulator. Previously, we have documented that CIRP regulates cardiac electrophysiology at posttranscriptional level, suggesting its role in SAN plasticity, especially upon stress conditions. OBJECTIVE: Our aim was to clarify the role of CIRP in SAN plasticity and heart rate regulation under stress conditions. METHODS AND RESULTS: Telemetric ECG monitoring demonstrated an excessive acceleration of heart rate under isoprenaline stimulation in conscious CIRP-KO (knockout) rats. Patch-clamp analysis and confocal microscopic Ca2+ imaging of isolated SAN cells demonstrated that isoprenaline stimulation induced a faster spontaneous firing rate in CIRP-KO SAN cells than that in WT (wild type) SAN cells. A higher concentration of cAMP-the key mediator of pacemaker activity-was detected in CIRP-KO SAN tissues than in WT SAN tissues. RNA sequencing and quantitative real-time polymerase chain reaction analyses of single cells revealed that the 4B and 4D subtypes of PDE (phosphodiesterase), which controls cAMP degradation, were significantly decreased in CIRP-KO SAN cells. A PDE4 inhibitor (rolipram) abolished the difference in beating rate resulting from CIRP deficiency. The mechanistic study showed that CIRP stabilized the mRNA of Pde4b and Pde4d by direct mRNA binding, thereby regulating the protein expression of PDE4B and PDE4D at posttranscriptional level. CONCLUSIONS: CIRP acts as an mRNA stabilizer of specific PDEs to control the cAMP concentration in SAN, maintaining the appropriate heart rate stress response.


Asunto(s)
Proteínas y Péptidos de Choque por Frío/metabolismo , Fosfodiesterasas de Nucleótidos Cíclicos Tipo 4/metabolismo , Frecuencia Cardíaca , Miocitos Cardíacos/metabolismo , Proteínas de Unión al ARN/metabolismo , Agonistas Adrenérgicos beta/farmacología , Animales , Células Cultivadas , Proteínas y Péptidos de Choque por Frío/genética , AMP Cíclico/metabolismo , Fosfodiesterasas de Nucleótidos Cíclicos Tipo 4/genética , Isoproterenol/farmacología , Masculino , Miocitos Cardíacos/efectos de los fármacos , Miocitos Cardíacos/fisiología , Inhibidores de Fosfodiesterasa/farmacología , Estabilidad del ARN , Proteínas de Unión al ARN/genética , Ratas , Ratas Sprague-Dawley , Rolipram/farmacología , Nodo Sinoatrial/citología , Nodo Sinoatrial/metabolismo , Nodo Sinoatrial/fisiología , Estrés Fisiológico
11.
Crit Rev Food Sci Nutr ; : 1-23, 2022 Oct 31.
Artículo en Inglés | MEDLINE | ID: mdl-36315042

RESUMEN

Synbiotic is defined as the dietary mixture that comprises both probiotic microorganisms and prebiotic substrates. The concept has been steadily gaining attention owing to the rising recognition of probiotic, prebiotics, and gut health. Among prebiotic substances, oligosaccharides demonstrated considerable health beneficial effects in varieties of food products and their combination with probiotics have been subjected to full range of evaluations. This review delineated the landscape of studies using microbial cultures, cell lines, animal model, and human subjects to explore the functional properties and host impacts of these combinations. Overall, the results suggested that these combinations possess respective metabolic properties that could facilitate beneficial activities therefore could be employed as dietary interventions for human health improvement and therapeutic purposes. However, uncertainties, such as applicational practicalities, underutilized analytical tools, contradictory results in studies, unclear mechanisms, and legislation hurdles, still challenges the broad utilization of these combinations. Future studies to address these issues may not only advance current knowledge on probiotic-prebiotic-host interrelationship but also promote respective applications in food and nutrition.

12.
Br J Nutr ; 127(4): 556-562, 2022 02 28.
Artículo en Inglés | MEDLINE | ID: mdl-33820572

RESUMEN

The objective of this study is to investigate the effects of vitamin A, D and their interaction on the glycaemic control in patients with both diabetes and tuberculosis. Tuberculosis infection and its treatment induce hyperglycaemia and complicate the glycaemic control in patients with diabetes. A randomised controlled trial with a 2 × 2 factorial design was conducted in a tuberculosis-specialised hospital in Qingdao, China. A total of 279 patients who have both diabetes and tuberculosis were included in this analysis. The patients received standard anti-tuberculosis treatment alone (control group), or together with a dose of vitamin A (600 µg RAE/d) or vitamin D (10 µg/d) or a combination of vitamin A (600 µg RAE/d) and vitamin D (10 µg/d) for 2 months. The effects of the intervention on fasting plasma glucose and 2-h postprandial blood glucose were investigated by ANCOVA. The analysis was adjusted for baseline values, age, sex, smoking, drinking and antidiabetic treatment as covariates. No significant effect was observed for vitamin A and D supplementation on fasting plasma glucose, 2-h postprandial blood glucose, BMI and related blood parameters. No interaction was observed between vitamin A and D supplementation for these endpoints. Vitamin A and D supplementation showed a null effect on the glycaemic control for patients with concurrent diabetes and tuberculosis. Future work should evaluate the effect of vitamin A and D supplementation on insulin-related indices for these patients and investigate the effect of vitamin D receptor genotypes.


Asunto(s)
Diabetes Mellitus Tipo 2 , Tuberculosis , Glucemia , Diabetes Mellitus Tipo 2/complicaciones , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Suplementos Dietéticos , Control Glucémico , Humanos , Tuberculosis/complicaciones , Tuberculosis/tratamiento farmacológico , Vitamina A/uso terapéutico , Vitamina D/uso terapéutico
13.
Eur J Nutr ; 61(7): 3315-3326, 2022 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-35318493

RESUMEN

PURPOSE: The associations between blood retinol, retinol-binding protein (RBP) concentrations and diabetes mellitus were inconsistent in literature. The objective is to investigate these associations by a systematic review and meta-analysis and provide basis for clinical intervention. METHODS: PubMed, Web of science, and Cochrane databases were searched from the beginning to July 1, 2021. A total of 13 studies on retinol and 31 studies on RBP are included in the current meta-analysis. RESULTS: The blood retinol concentration was significantly lower in the type I diabetes mellitus (T1DM) [standardized mean difference (SMD) (95% CI): - 0.59 (- 0.81, - 0.37), P < 0.01] and gestational diabetes mellitus (GDM) patients [SMD (95% CI): - 0.54 (- 0.87, - 0.20), P < 0.01] than in the controls. However, the difference was not significant between the type II diabetes mellitus (T2DM) patients and the controls. The RBP concentration was significantly higher in the diabetic patients than in the controls [SMD (95% CI): 0.24 (0.12, 0.35), P < 0.01]. Particularly, the RBP concentration was significantly higher in the T2DM and GDM patients. CONCLUSION: The blood retinol concentration was negatively associated with T1DM and GDM, while the blood RBP concentration was positively associated with T2DM and GDM. Future work should use a more sensitive retinol measurement method like retinol isotope dilution method to confirm whether blood retinol concentration differs between the diabetes patients and the controls.


Asunto(s)
Diabetes Mellitus Tipo 1 , Diabetes Mellitus Tipo 2 , Diabetes Gestacional , Proteínas de Unión al Retinol , Vitamina A , Femenino , Humanos , Estudios Observacionales como Asunto , Embarazo , Proteínas de Unión al Retinol/análisis , Vitamina A/sangre
14.
J Appl Microbiol ; 133(2): 349-361, 2022 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-35365897

RESUMEN

AIMS: Mathematical models were employed to predict the growth kinetic parameters of Fusarium graminearum and the accumulation of deoxynivalenol (DON) during wheat storage as a function of different moisture contents (MCs) and temperatures. METHODS AND RESULTS: The colony counting method was used to quantify F. graminearum growth under different environmental conditions, and kinetic and probability models were developed to describe the effect of different MCs and temperatures on fungal growth and DON production during wheat storage. Among the employed secondary models (Arrhenius-Davey, Gibson and Cardinal), the general polynomial best predicted the fungal growth rate under varying temperature and MC during wheat storage. According to the logistic model, DON contamination was correctly predicted in 96.5% of cases. CONCLUSIONS: The maximum growth rate of fungi was 0.4889 ± 0.092 Log CFU g-1  day-1 at 25°C and 30% moisture according to the polynomial model. At below 17°C and ≤15% moisture, no fungal growth was observed. The probability model of toxin production showed no toxin production at less than 15% moisture (aw ≤0.76) and below 15°C. SIGNIFICANCE AND IMPACT OF THE STUDY: This is the first application of a probability model of DON production during wheat storage, providing a reference for preventing fungal growth and mycotoxin accumulation by F. graminearum during wheat storage and guaranteeing food product safety.


Asunto(s)
Fusarium , Triticum , Enfermedades de las Plantas/microbiología , Probabilidad , Tricotecenos , Triticum/microbiología
15.
Sensors (Basel) ; 22(17)2022 Sep 02.
Artículo en Inglés | MEDLINE | ID: mdl-36081104

RESUMEN

Lamb Wave (LW)-based structural health monitoring method is promising, but its main obstacle is damage assessment in varying environments. LW simulation based on piezoelectric transducers (referred to as PZTs) is an efficient and low-cost method. This paper proposes a multiphysics simulation method of LW propagation with the PZTs under temperature effect. The effect of temperature on LW propagation is considered from two aspects. On the one hand, temperature affects the material parameters of the structure, the adhesive layers and the PZTs. On the other hand, it is considered that the thermal stress caused by the inconsistency of thermal expansion coefficients among the structure, the adhesive layers, and the PZTs affect the piezoelectric constant of the PZTs. Based on the COMSOL Multiphysics, the mechanic-electric-thermal directly coupling simulation model under temperature effect is established. The simulation model consists of two steps. In the first step, the thermal-mechanic coupling is carried out to calculate the thermal stress, and the thermal stress effect is introduced into the piezoelectric constant model. In the second step, mechanic-electric coupling is carried out to simulate LW propagation, which considers the piezoelectric effect of the PZTs for the LW excitation and reception. The simulation results at -20 °C to 60 °C are obtained and compared to the experiment. The results show that the A0 and S0 mode of simulation signals match well with the experimental measurements. Additionally, the effect of temperature on LW propagation is consistent between simulation and experiment; that is, the amplitude increases, and the phase velocity decreases with the increment of temperature.


Asunto(s)
Electricidad , Transductores , Simulación por Computador , Temperatura
16.
J Digit Imaging ; 35(5): 1153-1163, 2022 10.
Artículo en Inglés | MEDLINE | ID: mdl-35581408

RESUMEN

Automatic segmentation and measurement of the choroid layer is useful in studying of related fundus diseases, such as diabetic retinopathy and high myopia. However, most algorithms are not helpful for choroid layer segmentation due to its blurred boundaries and complex gradients. Therefore, this paper aimed to propose a novel choroid segmentation method that combines image enhancement and attention-based dense (AD) U-Net network. The choroidal images obtained from optical coherence tomography (OCT) are pre-enhanced by algorithms that include flattening, filtering, and exponential and linear enhancement to reduce choroid-independent information. Experimental results obtained from 800 OCT B-scans of the choroid layers from both normal eyes and high myopia showed that image enhancement significantly increased the performance of ADU-Net, with an AUC of 99.51% and a DSC of 97.91%. The accuracy of segmentation using the ADU-Net method with image enhancement is superior to that of the existing networks. In addition, we describe some algorithms that can measure automatically choroidal foveal thickness and the volume of adjacent areas. Statistical analyses of the choroidal parameters variation indicated that compared with normal eyes, high myopia has a reduction of 86.3% of the choroidal foveal thickness and 90% of the adjacent volume. It proved that high myopia is likely to cause choroid layer attenuation. These algorithms would have wide application in the diagnosis and precaution of related fundus lesions caused by choroid thinning from high myopia in future studies.


Asunto(s)
Aprendizaje Profundo , Retinopatía Diabética , Miopía , Humanos , Tomografía de Coherencia Óptica/métodos , Coroides/diagnóstico por imagen , Coroides/patología , Miopía/diagnóstico por imagen , Miopía/patología
17.
Entropy (Basel) ; 24(6)2022 May 28.
Artículo en Inglés | MEDLINE | ID: mdl-35741484

RESUMEN

This paper investigates the outage performance of simultaneous wireless information and power transfer (SWIPT)-enabled relay networks with the decode-and-forward relaying protocol, where the effect of the energy triggering threshold at the relay on the system performance is considered. The closed-form expressions of the system outage probability and throughput are derived in Rician channel fading. Monte Carlo Simulation method is used to verify the accuracy of the derived closed-form expressions. The effects of some system parameters on the system performances are discussed via simulations, which show that the system outage probability increases with the increase of the minimum transmission rate required by the users and also decreases with the increase of the energy conversion efficiency. Besides, the system throughput increaseswith the increment of the transmit power of the source node, as well as the energy conversion efficiency. Additionally, the outage performance of the system with the equal two-hop distance is better than that of the system with unequal two-hop distance.

18.
J Cell Mol Med ; 25(12): 5525-5533, 2021 06.
Artículo en Inglés | MEDLINE | ID: mdl-33960660

RESUMEN

Osteoporosis is one of the most common metabolic bone diseases affecting millions of people. We previously found that harmine prevents bone loss in ovariectomized mice via increasing preosteoclast platelet-derived growth factor-BB (PDGF-BB) production and type H vessel formation. However, the molecular mechanisms by which harmine promotes preosteoclast PDGF-BB generation are still unclear. In this study, we revealed that inhibitor of DNA binding-2 (Id2) and activator protein-1 (AP-1) were important factors implicated in harmine-enhanced preosteoclast PDGF-BB production. Exposure of RANKL-induced Primary bone marrow macrophages (BMMs), isolated from tibiae and femora of mice, to harmine increased the protein levels of Id2 and AP-1. Knockdown of Id2 by Id2-siRNA reduced the number of preosteoclasts as well as secretion of PDGF-BB in RANKL-stimulated BMMs administrated with harmine. Inhibition of c-Fos or c-Jun (components of AP-1) both reversed the stimulatory effect of harmine on preosteoclast PDGF-BB production. Dual-luciferase reporter assay analyses determined that PDGF-BB was the direct target of AP-1 which was up-regulated by harmine treatment. In conclusion, our data demonstrated a novel mechanism involving in the production of PDGF-BB increased by harmine, which may provide potential therapeutic targets for bone loss diseases.


Asunto(s)
Becaplermina/metabolismo , Médula Ósea/efectos de los fármacos , Harmina/farmacología , Proteína 2 Inhibidora de la Diferenciación/metabolismo , Macrófagos/efectos de los fármacos , Osteoclastos/metabolismo , Factor de Transcripción AP-1/metabolismo , Animales , Médula Ósea/metabolismo , Células Cultivadas , Alucinógenos/farmacología , Proteína 2 Inhibidora de la Diferenciación/genética , Macrófagos/citología , Macrófagos/metabolismo , Ratones , Osteoclastos/citología , Factor de Transcripción AP-1/genética
19.
Br J Nutr ; 125(11): 1260-1269, 2021 06 14.
Artículo en Inglés | MEDLINE | ID: mdl-32959735

RESUMEN

The effects of resistant starch on glycaemic control are controversial. In this study, a systematic review and meta-analysis of results from nineteen randomised controlled trials (RCT) was performed to illustrate the effects of resistant starch on glycaemic control. A literature search was conducted on PubMed, Scopus and Cochrane electronic databases for related publications from inception to 6 April 2020. Key inclusion criteria were: RCT; resistant starch as intervention substances and reporting glucose- and insulin-related endpoints. Exclusion criteria were: using type I resistant starch or a mixture of resistant starch and other functional food ingredients as intervention; using substances other than digestible starch as controls. The effect of resistant starch on fasting plasma glucose was significant (effect size (ES) -0·09 (95 % CI -0·13, -0·04) mmol/l, P = 0·001) compared with digestible starch. Subgroup analyses revealed that the ES was larger when the dosage of resistant starch was more than 28 g/d (ES -0·16 (95 % CI -0·24, -0·08) mmol/l, P < 0·001) or the intervention period was more than 8 weeks (ES -0·12 (95 % CI -0·18, -0·06) mmol/l, P < 0·001). The effect on homoeostatic model assessment (HOMA)-insulin resistance (IR) was significant (ES -0·33 (95 % CI -0·51, -0·14), P = 0·001). However, the effects on other insulin-related endpoints were not significant, including fasting plasma insulin, four endpoints from the frequently sampled intravenous glucose tolerance test (insulin sensitivity index, acute insulin response, disposition index and glucose effectiveness) and HOMA-ß. The current study indicated moderate effects of resistant starch on improving glycaemic control.


Asunto(s)
Glucemia/efectos de los fármacos , Control Glucémico/métodos , Almidón Resistente/administración & dosificación , Adulto , Suplementos Dietéticos , Ayuno/sangre , Femenino , Alimentos Funcionales , Humanos , Insulina/sangre , Resistencia a la Insulina , Masculino , Persona de Mediana Edad , Ensayos Clínicos Controlados Aleatorios como Asunto , Granos Enteros
20.
Br J Nutr ; 125(8): 926-933, 2021 04 28.
Artículo en Inglés | MEDLINE | ID: mdl-32873351

RESUMEN

Increased intake of vegetables and fruits has been associated with reduced risk of tuberculosis infection. Vegetables and fruits exert immunoregulatory effects; however, it is not clear whether vegetables and fruits have an adjuvant treatment effect on tuberculosis. Between 2009 and 2013, a hospital-based cohort study was conducted in Linyi, Shandong Province, China. Treatment outcome was ascertained by sputum smear and chest computerised tomography, and dietary intake was assessed by a semi-quantitative FFQ. The dietary questionnaire was conducted at the end of month 2 of treatment initiation. Participants recalled their dietary intake of the previous 2 months. A total of 2309 patients were enrolled in this study. After 6 months of treatment, 2099 patients were successfully treated and 210 were uncured. In multivariate models, higher intake of total vegetables and fruits (OR 0·70; 95 % CI 0·49, 0·99), total vegetables (OR 0·68; 95 % CI 0·48, 0·97), dark-coloured vegetables (OR 0·61; 95 % CI 0·43, 0·86) and light-coloured vegetables (OR 0·67; 95 % CI 0·48, 0·95) were associated with reduced failure rate of tuberculosis treatment. No association was found between total fruit intake and reduced failure rate of tuberculosis treatment (OR 0·98; 95 % CI 0·70, 1·37). High intake of total vegetables and fruits, especially vegetables, is associated with lower risk of failure of tuberculosis treatment in pulmonary tuberculosis patients. The results provide important information for dietary guidelines during tuberculosis treatment.


Asunto(s)
Dieta , Frutas , Tuberculosis Pulmonar/terapia , Verduras , Adulto , Anciano , China , Estudios de Cohortes , Ingestión de Alimentos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Política Nutricional , Insuficiencia del Tratamiento , Resultado del Tratamiento
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