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1.
Small ; 19(14): e2206767, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-36642851

RESUMEN

Due to the upstream pressure of lithium resources, low-cost sodium-ion batteries (SIBs) have become the most potential candidates for energy storage systems in the new era. However, anode materials of SIBs have always been a major problem in their development. To address this, V2 C/Fe7 S8 @C composites with hierarchical structures prepared via an in situ synthesis method are proposed here. The 2D V2 C-MXene as the growth substrate for Fe7 S8  greatly improves the rate capability of SIBs, and the carbon layer on the surface provides a guarantee for charge-discharge stability. Unexpectedly, the V2 C/Fe7 S8 @C anode achieves satisfactory sodium storage capacity and exceptional rate performance (389.7 mAh g-1  at 5 A g-1 ). The sodium storage mechanism and origin of composites are thoroughly studied via ex situ characterization techniques and first-principles calculations. Furthermore, the constructed sodium-ion capacitor assembled with N-doped porous carbon delivers excellent energy density (135 Wh kg-1 ) and power density (11 kW kg-1 ), showing certain practical value. This work provides an advanced system of sodium storage anode materials and broadens the possibility of MXene-based materials in the energy storage.

2.
J Gene Med ; 22(2): e3152, 2020 02.
Artículo en Inglés | MEDLINE | ID: mdl-31830337

RESUMEN

BACKGROUND: Troponin T1 (TNNT1) is a subunit of troponin that has been linked to neuromuscular disorder. Recently, it was reported that TNNT1 facilitates the proliferation of breast cancer cells. Interestingly, Cancer Genome Atlas data indicate that its overexpression is associated with an unfavorable prognosis of colorectal cancer (CRC) patients. The present study aimed to explore the expression, function and mechanism of dysregulation of TNNT1 in CRC. METHODS: Immunohistochemical staining and a real-time polymerase chain reaction were used to compare the expression level of TNNT1 in CRC tissues and adjacent tissues. Western blotting was used to detect the expression of TNNT1 in cell lines. Kaplan-Meier analysis and a chi-squared test were applied to evaluate the potential of TNNT1 to function as a cancer biomarker. RNA interference was used to inhibit TNNT1 expression in CRC cells, followed by detection of cell proliferation, apoptosis, migration and invasion. A luciferase reporter gene assay was used to determine the regulatory relationship between miR-873 and TNNT1. RESULTS: In the present study, we found that TNNT1 was significantly up-regulated in CRC samples and cell lines. The up-regulation of TNNT1 was also associated with several clinicopathologic features, and its high expression was correlated with an unfavorable prognosis of the patients. Knockdown of TNNT1 markedly arrested proliferation, migration and invasion, whereas it also promoted apoptosis. TNNT1 was identified as a target gene of miR-873, and there was a negative correlation among CRC samples. CONCLUSIONS: In conclusion, we have demonstrated that TNNT1, regulated by miR-873, is an oncogene of CRC associated with patient prognosis.


Asunto(s)
Neoplasias Colorrectales/patología , MicroARNs/genética , Troponina T/metabolismo , Apoptosis , Biomarcadores de Tumor/genética , Línea Celular Tumoral , Movimiento Celular , Proliferación Celular , Neoplasias Colorrectales/genética , Progresión de la Enfermedad , Femenino , Regulación Neoplásica de la Expresión Génica , Células HT29 , Humanos , Masculino , Invasividad Neoplásica , Pronóstico , Troponina T/genética
3.
Analyst ; 144(11): 3546-3551, 2019 Jun 07.
Artículo en Inglés | MEDLINE | ID: mdl-31041945

RESUMEN

A turn-on two-photon fluorescent probe HCA-Green for hypochlorous acid (HOCl) was synthesized using 4-methylamino-1,8-naphthalimide (MNA) as a two-photon fluorophore and p-hydroxyaniline as a leaving-recognition domain. Both the probe and the fluorophore were investigated under one- and two-photon excitation modes. The fluorescence intensity of the probe was enhanced by ∼229-fold and ∼193-fold under one-photon and two-photon excitation, respectively, after reacting with HOCl. A maximal two-photon action cross-section of 50 GM was obtained under excitation at 810 nm. The probe exhibited high sensitivity with a detection limit of 42.3 nM, as well as high selectivity, low cytotoxicity, and good photostability. Two-photon microscopy (TPM) was conducted to visualize HOCl levels in living cells and tissues. The production of endogenous HOCl induced by lipopolysaccharide-mediated inflammation was successfully monitored with this probe.


Asunto(s)
Colorantes Fluorescentes/química , Ácido Hipocloroso/análisis , Inflamación/metabolismo , Animales , Fluorescencia , Colorantes Fluorescentes/síntesis química , Colorantes Fluorescentes/efectos de la radiación , Colorantes Fluorescentes/toxicidad , Células HeLa , Humanos , Concentración de Iones de Hidrógeno , Inflamación/inducido químicamente , Luz , Límite de Detección , Lipopolisacáridos , Ratones Desnudos , Microscopía Fluorescente/métodos , Ratas
4.
Beilstein J Org Chem ; 15: 2958-2965, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31921367

RESUMEN

The construction of the biologically interesting chromone skeleton was realized by PhIO-mediated dehydrogenation of chromanones under mild conditions. Interestingly, this method also found application in the synthesis of the naturally occurring frutinone A.

5.
Zhongguo Zhong Yao Za Zhi ; 43(6): 1268-1275, 2018 Mar.
Artículo en Zh | MEDLINE | ID: mdl-29676139

RESUMEN

To evaluate the effectiveness and safety of Xinling Wan on patients with stable angina pectoris, a randomized, double-blinded, placebo parallel-controlled, multicenter clinical trial was conducted. A total of 232 subjects were enrolled and randomly divided into experiment group and placebo group. The experiment group was treated with Xinling Wan (two pills each time, three times daily) for 4 weeks, and the placebo group was treated with placebo. The effectiveness evaluation showed that Xinling Wan could significantly increase the total duration of treadmill exercise among patients with stable angina pectoris. FAS analysis showed that the difference value of the total exercise duration was between experiment group (72.11±139.32) s and placebo group (31.25±108.32) s. Xinling Wan could remarkably increase the total effective rate of angina pectoris symptom score, and the analysis showed that the total effective rate was 78.95% in experiment group and 42.61% in placebo group. The reduction of nitroglycerin dose was (2.45±2.41) tablets in experiment group and (0.50±2.24) tablets in placebo group on the basis of FAS analysis. The decrease of symptom integral was (4.68±3.49) in experiment group and (3.19±3.31) in placebo group based on FAS analysis. Besides, Xinling Wan could decrease the weekly attack time and the duration of angina pectoris. PPS analysis results were similar to those of FAS analysis. In conclusion, Xinling Wan has an obvious therapeutic effect in treating stable angina pectoris, with a good safety and a low incidence of adverse event and adverse reaction in experiment group.


Asunto(s)
Angina de Pecho/tratamiento farmacológico , Angina Estable/tratamiento farmacológico , Medicamentos Herbarios Chinos/uso terapéutico , Método Doble Ciego , Prueba de Esfuerzo , Humanos , Nitroglicerina
6.
Bioorg Chem ; 73: 63-75, 2017 08.
Artículo en Inglés | MEDLINE | ID: mdl-28618343

RESUMEN

Neuroprotection refers to the relative preservation of neuronal structure and function. Neuroprotective agents refer to substances that are capable of preserving brain function and structure. Currently, there are no neuroprotective agents available that can effectively relieve the progression of Parkinson's disease. In this work, five novel 4-aminopyridine derivatives, including three amides and two ureas, were designed, synthesized, and evaluated using the rat PC12 mice pheochromocytoma cell line as an in vitro model. As well as human Rho kinase inhibitory experiment was performed. Among them, compound 3, which exhibited high cell viability, low cytotoxicity and good efficacy of inhibition on α-synuclein, oxidation, inflammation and Rho kinase, was profound as potential agents for Parkinson's disease (PD).


Asunto(s)
4-Aminopiridina/farmacología , Diseño de Fármacos , Simulación del Acoplamiento Molecular , Fármacos Neuroprotectores/farmacología , Enfermedad de Parkinson/tratamiento farmacológico , Inhibidores de Proteínas Quinasas/farmacología , 4-Aminopiridina/síntesis química , 4-Aminopiridina/química , Animales , Proliferación Celular/efectos de los fármacos , Supervivencia Celular/efectos de los fármacos , Células Cultivadas , Relación Dosis-Respuesta a Droga , Humanos , Inmunohistoquímica , Estructura Molecular , Fármacos Neuroprotectores/síntesis química , Fármacos Neuroprotectores/química , Células PC12 , Inhibidores de Proteínas Quinasas/síntesis química , Inhibidores de Proteínas Quinasas/química , Ratas , Relación Estructura-Actividad , alfa-Sinucleína/antagonistas & inhibidores , alfa-Sinucleína/metabolismo , Quinasas Asociadas a rho/antagonistas & inhibidores , Quinasas Asociadas a rho/metabolismo
7.
Appl Microbiol Biotechnol ; 101(5): 2131-2141, 2017 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-27896382

RESUMEN

Batch culture of Candida utilis CCTCC M 209298 for the preparation of selenium (Se)-enriched yeast was carried out under different pH conditions, and maximal intracellular organic Se and glutathione (GSH) contents were obtained in a moderate acid stress environment (pH 3.5). In order to elucidate the physiological mechanism of improved performance of Se-enriched yeast by acid stress, assays of the key enzymes involved in GSH biosynthesis and determinations of energy supply and regeneration were performed. The results indicated that moderate acid stress increased the activity of γ-glutamylcysteine synthetase and the ratios of NADH/NAD+ and ATP/ADP, although no significant changes in intracellular pH were observed. In addition, the molecular mechanism of moderate acid stress favoring the improvement of Se-yeast performance was revealed by comparing whole transcriptomes of yeast cells cultured at pH 3.5 and 5.5. Comparative analysis of RNA-Seq data indicated that 882 genes were significantly up-regulated by moderate acid stress. Functional annotation of the up-regulated genes based on gene ontology and the Kyoto Encyclopedia of Genes and Genome (KEGG) pathway showed that these genes are involved in ATP synthesis and sulfur metabolism, including the biosynthesis of methionine, cysteine, and GSH in yeast cells. Increased intracellular ATP supply and more amounts of sulfur-containing substances in turn contributed to Na2SeO3 assimilation and biotransformation, which ultimately improved the performance of the Se-enriched C. utilis.


Asunto(s)
Candida/metabolismo , Glutamato-Cisteína Ligasa/metabolismo , Glutatión/metabolismo , Compuestos de Selenio/metabolismo , Selenio/metabolismo , Adenosina Trifosfato/biosíntesis , Candida/genética , Cisteína/biosíntesis , Glutatión/biosíntesis , Metionina/biosíntesis , Azufre/metabolismo , Transcriptoma/genética
8.
J Sci Food Agric ; 96(11): 3950-5, 2016 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-26678857

RESUMEN

BACKGROUND: Isotopic discrimination, dietary composition and feeding regime determine the carbon and nitrogen stable isotope ratios of animals. Accordingly, measurement of the stable isotope ratios of carbon and nitrogen can be a potential method to identify patterns of pork production. RESULTS: In the current study, we investigated the carbon and nitrogen isotopic ratio in pork from organic and conventional systems. The average carbon and nitrogen isotope ratios for various organic tissues, including hair, blood and defatted meat, were higher than those of conventionally raised ones. The discriminant analysis results based on the combination of carbon and nitrogen isotopic ratios in defatted meat reached a 100% correct classification. Furthermore, the variation in carbon and nitrogen stable isotope ratios of retail organic and conventional pork has been studied over 1 year. The results suggested that organic pork had a higher δ(13) C value than that of the conventional pork in all but three fortnights. Grouping of the δ(15) N data showed that the δ(15) N value in organic pork was higher than that of the conventional one throughout the whole year. CONCLUSION: The method established in the present study provides a potential detection that can be highly valuable to prevent fraudulent labelling of organic pork. © 2015 Society of Chemical Industry.


Asunto(s)
Inspección de Alimentos/métodos , Alimentos Orgánicos/análisis , Carne/análisis , Músculo Esquelético/metabolismo , Sus scrofa/crecimiento & desarrollo , Algoritmos , Animales , Isótopos de Carbono , China , Análisis Discriminante , Etiquetado de Alimentos , Alimentos Orgánicos/economía , Alimentos Orgánicos/normas , Carne/economía , Carne/normas , Músculo Esquelético/crecimiento & desarrollo , Isótopos de Nitrógeno , Estaciones del Año , Sus scrofa/metabolismo
9.
Pharmazie ; 69(12): 867-73, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25951658

RESUMEN

Nine isoquinoline Rho kinase inhibitors were designed and synthesized on the basis of a ligand-binding pocket model. With fasudil, the only Rho kinase inhibitor marketed to date, as a reference compound, their biological activities were determined, including assays of Rho kinase inhibitory activity, synapse formation, cell viability. Bio-assays were performed by means of MTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assays and lactate dehydrogenase (LDH) assays. The obtained results indicated that (R)-6H-1-(5-isoquinolinesulfonyl)-2-hydroxy methyl-1-pyrrolidine and (R)-6H-1-(5-isoquinolinesulfonyl)-2-chloromethyl-1-pyrrolidine exhibited excellent Rho kinase inhibitory activity, deactivation of Rho kinase led to accelerated synapse formation and enhanced cell viability. Therefore they might be potential candidates for preventing various neurological disorders. The brief study on the structure-activity relationship of these isoquinoline analogues demonstrated that modification of inhibitors targeting region D of the Rho kinase binding pocket is quite efficacious, the existence of free amino, chloro- or hydroxyl group as binding sites with region D of Rho kinase is necessary for increasing the inhibitory activity.


Asunto(s)
1-(5-Isoquinolinesulfonil)-2-Metilpiperazina/análogos & derivados , Inhibidores de Proteínas Quinasas/síntesis química , Inhibidores de Proteínas Quinasas/farmacología , 1-(5-Isoquinolinesulfonil)-2-Metilpiperazina/síntesis química , 1-(5-Isoquinolinesulfonil)-2-Metilpiperazina/farmacología , Línea Celular , Supervivencia Celular/efectos de los fármacos , Diseño de Fármacos , Humanos , L-Lactato Deshidrogenasa/metabolismo , Microglía/efectos de los fármacos , Neuronas/efectos de los fármacos , Cultivo Primario de Células , Relación Estructura-Actividad , Sinapsis/efectos de los fármacos , Quinasas Asociadas a rho/antagonistas & inhibidores
10.
IEEE Trans Image Process ; 33: 722-737, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38150348

RESUMEN

Deep neural networks (DNNs) are shown to be vulnerable to universal adversarial perturbations (UAP), a single quasi-imperceptible perturbation that deceives the DNNs on most input images. The current UAP methods can be divided into data-dependent and data-independent methods. The former exhibits weak transferability in black-box models due to overly relying on model-specific features. The latter shows inferior attack performance in white-box models as it fails to exploit the model's response information to benign images. To address the above issues, this paper proposes a novel universal adversarial attack to generate UAP with strong transferability by disrupting the model-agnostic features (e.g., edges or simple texture), which are invariant to the models. Specifically, we first devise an objective function to weaken the significant channel-wise features and strengthen the less significant channel-wise features, which are partitioned by the designed strategy. Furthermore, the proposed objective function eliminates the dependency on labeled samples, allowing us to utilize out-of-distribution (OOD) data to train UAP. To enhance the attack performance with limited training samples, we exploit the average gradient of the mini-batch input to update the UAP iteratively, which encourages the UAP to capture the local information inside the mini-batch input. In addition, we introduce the momentum term to accumulate the gradient information at each iterative step for the purpose of perceiving the global information over the training set. Finally, extensive experimental results demonstrate that the proposed methods outperform the existing UAP approaches. Additionally, we exhaustively investigate the transferability of the UAP across models, datasets, and tasks.

11.
Neural Netw ; 177: 106391, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-38776759

RESUMEN

Wide deployment of deep neural networks (DNNs) based applications (e.g., style transfer, cartoonish), stimulating the need for copyright protection of such application's production. Though some traditional visible copyright techniques exist, they often introduce undesired artifacts and compromise the aesthetic quality of the images. In this paper, we propose a novel invisible, robust copyright protection method, which is composed of two networks: the copyright encoder and the copyright decoder. The former projects the copyright information to the invisible perturbation with the drive of both the input of images and copyright information, thereby adding it to the image and yielding encoded images. The copyright decoder extracts copyright information from encoded images. Moreover, a robustness module is integrated to enhance the decoder's ability to decipher images against various distortions encountered on social media platforms. Furthermore, the loss function is elaborately designed, taking into account both feature space and color space, to guarantee the quality of encoded and decoded copyright images. Extensively objective and subjective experiments validate the effectiveness of the proposed method. Additionally, the physical test is conducted by posting the encoded images to social media (e.g., Weibo and Twitter) and downloading them to verify the feasibility of the proposed method in practice.


Asunto(s)
Derechos de Autor , Redes Neurales de la Computación , Medios de Comunicación Sociales , Humanos , Aprendizaje Profundo , Seguridad Computacional , Procesamiento de Imagen Asistido por Computador/métodos
12.
Ultrason Sonochem ; 103: 106766, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38271781

RESUMEN

In this study, ultrasonic-ethanol pretreatment combined with AEE was developed for oil extraction from hemp seeds. The oil yield reached a maximum of 23.32 % at 200 W ultrasonic power and 30 min ultrasonic time, at this point, the degradation rate of Δ9-THC was 83.11 %. By determining the composition of hemp seed before and after pretreatment, it was shown that ultrasonic-ethanol pretreatment reduced the protein content of the raw material. An enzyme mixture consisting of pectinase and hemicellulase (1/1/1, w/w/w) was experimentally determined to be used, and the AEE extraction conditions were optimized using the Plackett-Burman design and the Box-Behnken. The optimal conditions were determined to be pH 5, total enzyme activity of 37,800 U/g, liquid-solid ratio of 10.4 mL/g, enzyme digestion temperature of 32 °C, enzymatic time of 189 min, and oil recovery of 88.38 %. The results of confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) showed that the emulsion formed during ultrasonic ethanol pretreatment was not uniformly distributed, and the droplets appeared to be aggregated; and the irregular pores of hemp seed increased after pretreatment. The contents of Δ9-THC and CBN in the extracted oil samples were 9.58 mg/kg and 52.45 mg/kg, respectively. Compared with the oil extracted by Soxhlet extraction (SE), the oil extracted by this experimental method was of better quality and similar in fatty acid composition.


Asunto(s)
Cannabis , Extractos Vegetales , Cannabis/química , Ultrasonido , Dronabinol/análisis , Etanol/análisis , Semillas/química , Agua/química , Aceites de Plantas/química
13.
Food Chem ; 444: 138633, 2024 Jun 30.
Artículo en Inglés | MEDLINE | ID: mdl-38330607

RESUMEN

The present study focused on investigating the stability and in vitro simulation characteristics of oil-in-water (O/W) and oleogel-in-water (Og/W) emulsions. Compared with O/W emulsion, the Og/W emulsion exhibited superior stability, with a more evenly spread droplet distribution, and the Og/W emulsion containing 3 % hemp seed protein (HSP) showed better stability against environmental factors, including heat treatment, ionic strength, and changes in pH. Additionally, the stability of Δ9-tetrahydrocannabinol (Δ9-THC) and cannabinol (CBN) and the in vitro digestion of hemp seed oil (HSO) were evaluated. The half-life of CBN in the Og/W emulsion was found to be 131.82 days, with a degradation rate of 0.00527. The in vitro simulation results indicated that the Og/W emulsion effectively delayed the intestinal digestion of HSO, and the bioaccessibility of Δ9-THC and CBN reached 56.0 % and 58.0 %, respectively. The study findings demonstrated that the Og/W emulsion constructed with oleogel and HSP, exhibited excellent stability.


Asunto(s)
Cannabis , Extractos Vegetales , Cannabis/metabolismo , Emulsiones/metabolismo , Cannabinol , Dronabinol , Agua , Compuestos Orgánicos
14.
J Colloid Interface Sci ; 668: 459-470, 2024 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-38691956

RESUMEN

Developing high-performance composites with fast charging and superior cycle life is paramount for lithium-ion batteries (LIBs). Herein, we synthesized a double-shell carbon-coated porous structure composite with a compact surface (P-Si@rGO@C) using low-cost commercial micron-sized silicon (Si) instead of nanoscale silicon. Results reveal that the unique P-Si@rGO@C features high adaptability to volume expansion, accelerates electron/ion transmission rate, and forms a stable solid electrolyte interphase (SEI) film. This phenomenon arises from the synergistic effect of abundant internal voids and an external double-layer carbon shell with a dense surface. Specifically, the P-Si@rGO@C anode exhibits a high initial coulombic efficiency (ICE) (88.0 %), impressive rate-capability (612.1 mAh/g at 2C), and exceptional long-term cyclability (972.2 mAh/g over 500 cycles at 0.5C). Further kinetic studies elucidate the diffusion-capacitance hybrid energy storage mechanism and reveal an improved Li+ diffusion coefficient (from 3.47 × 10-11 to 2.85 × 10-9 cm2 s-1). Ex-situ characterization confirms the crystal phase change of micron-sized Si and the formation of a stable LiF-rich SEI. Theoretical calculations support these findings by demonstrating an enhancement in the adsorption ability of Si to Li+ (from -0.89 to -0.97 eV) and a reduction in the energy migration barrier (from 0.35 to 0.18 eV). Additionally, practical LixSi powder is shown to increase the ICE of full cells from 67.4 % to 87.9 %. Furthermore, a pouch cell utilizing the prelithiated P-Si@rGO@C anode paired with LiNi1/3Co1/3Mn1/3O2 (NCM111) cathode delivers a high initial reversible capacity of 7.2 mAh and 76.8 % capacity retention after 100 cycles. This work provides insights into the application of commercial silicon-aluminum alloy powder in the anode of high-energy LIBs.

15.
Turk J Gastroenterol ; 35(6): 465-474, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-39128081

RESUMEN

BACKGROUND/AIMS:  Incidence of colorectal cancer is rapidly increasing worldwide. Extracellular superoxide dismutase (EcSOD; SOD3) is an antioxidant enzyme. However, SOD3 roles in colorectal cancer progression remain uncertain. MATERIALS AND METHODS:  Superoxide dismutase 3 expression was evaluated, and we analyzed clinical relevance of SOD3 expression in colorectal cancer. Subsequently, SOD3 roles in colorectal cancer progression were detected by gain of function experiments. Changes in subcutaneous tumor and liver nodule size after SOD3 overexpression were examined in nude mice. The expression of proliferation marker Ki67 was assessed by immunohistochemical staining. RESULTS:  Supperoxide dismutase 3 was downregulated in colorectal cancer (P <.01). Downregulation of SOD3 was correlated with unfavorable outcomes (P < .05). Superoxide dismutase 3 upregulation limited the proliferative (P <.05), migrative (P <.01) and invasive actions of colorectal cancer cells (P <.01) by suppressing epithelial-mesenchymal transition. Moreover, SOD3 overexpression reduced Ki67 expression (P <.01) and blocked tumor growth (P <01) and liver metastasis (P <.001) in mouse tumor model. CONCLUSION:  Superoxide dismutase 3 upregulation attenuates tumor growth and liver metastasis in colorectal cancer, suggesting that SOD3 has potential diagnostic and prognostic values regarding colorectal cancer treatment.


Asunto(s)
Movimiento Celular , Proliferación Celular , Neoplasias Colorrectales , Transición Epitelial-Mesenquimal , Superóxido Dismutasa , Animales , Femenino , Humanos , Masculino , Ratones , Persona de Mediana Edad , Línea Celular Tumoral , Neoplasias Colorrectales/patología , Neoplasias Colorrectales/genética , Progresión de la Enfermedad , Regulación hacia Abajo , Antígeno Ki-67/metabolismo , Neoplasias Hepáticas/patología , Ratones Endogámicos BALB C , Ratones Desnudos , Superóxido Dismutasa/metabolismo , Regulación hacia Arriba
16.
Sci Total Environ ; 944: 173989, 2024 Sep 20.
Artículo en Inglés | MEDLINE | ID: mdl-38879023

RESUMEN

There is insufficient understanding of the spatio-temporal evolution of surface water-groundwater quality and hydraulic connection under both natural and human influences in urban river basins. To this end, this paper investigated the spatio-seasonal pattern of hydrochemical evolution and surface water-groundwater interaction in a typical urban river basin (Dahei River basin) based on isotopic and hydrochemical data of 132 water samples collected during three seasons (normal, wet and dry seasons). From the normal season to the wet season, surface water in the Dahei River basin was dominated by the impacts of evaporation and groundwater discharge processes. During this period, the precipitation and agricultural activities (canal irrigation) were frequent. Thus, groundwater was affected by irrigation infiltration of surface water and precipitation from high-altitude areas. From the wet season to the dry season, precipitation decreased and irrigation methods changed (canal irrigation → well irrigation). In this case, groundwater discharge had a stronger impact on surface water, and shallow groundwater was recharged by deep groundwater through the well irrigation. Under this hydrological pattern, the hydrochemical characteristics of surface water were mainly influenced by evaporation, human activities (agricultural irrigation and sewage treatment) and groundwater discharge. In contrast, the hydrochemical characteristics of groundwater were main influenced by water-rock interactions (dissolution of evaporites and silicates, and cation exchange) and human activities. This study contributed to a better understanding of the hydrochemical and hydrological processes in urban river basins and provided a theoretical basis for the sustainable management of water resources.

17.
Bioorg Med Chem ; 21(14): 4178-85, 2013 Jul 15.
Artículo en Inglés | MEDLINE | ID: mdl-23719280

RESUMEN

A series of N-substituted desloratadine analogues were designed and synthesized. They were tested for H1 antihistamine activity by inhibiting histamine-induced contraction of isolated ileum muscles of guinea-pigs in vitro and inhibiting histamine-induced asthmatic reaction in guinea-pigs in vivo. All the evaluated compounds exhibited significant antihistamine activity compared with desloratadine. Five active compounds induced no sedative effects on mouse and four of them exhibited lower anticholinergic side effects than desloratadine. Among these analogues, compound 10, (1S,4S)-4-chlorocyclohexyl desloratadine displayed the highest activity and best safety profile. And it was believed to be a potential candidate as the 3rd generation antihistamine.


Asunto(s)
Diseño de Fármacos , Antagonistas de los Receptores Histamínicos H1/síntesis química , Antagonistas de los Receptores Histamínicos H1/farmacología , Loratadina/análogos & derivados , Animales , Estabilidad de Medicamentos , Células HEK293 , Antagonistas de los Receptores Histamínicos H1/química , Humanos , Concentración de Iones de Hidrógeno , Loratadina/síntesis química , Loratadina/química , Loratadina/farmacología , Ratones , Unión Proteica/efectos de los fármacos
18.
Neural Netw ; 163: 256-271, 2023 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-37086543

RESUMEN

Deep neural network-based object detectors are vulnerable to adversarial examples. Among existing works to fool object detectors, the camouflage-based method is more often adopted due to its adaptation to multi-view scenarios and non-planar objects. However, most of them can still be easily observed by human eyes, which limits their application in the real world. To fool human eyes and object detectors simultaneously, we propose a differential evolution based dual adversarial camouflage method. Specifically, we try to obtain the camouflage texture by the two-stage training, which can be wrapped over the surface of the object. In the first stage, we optimize the global texture to minimize the discrepancy between the rendered object and the scene background, making human eyes difficult to distinguish. In the second stage, we design three loss functions to optimize the local texture, which is selected from the global texture, making object detectors ineffective. In addition, we introduce the differential evolution algorithm to search for the near-optimal areas of the object to attack, improving the adversarial performance under certain attack area limitations. Experimental results show that our proposed method can obtain a good trade-off between fooling human eyes and object detectors under multiple specific scenes and objects.


Asunto(s)
Algoritmos , Redes Neurales de la Computación , Humanos
19.
Pathol Res Pract ; 241: 154234, 2023 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-36459833

RESUMEN

BACKGROUND: Colorectal cancer (CRC) is a common malignancy, and radioresistance limits the effectiveness of radiotherapy for rectal cancer. This study is performed to investigate the role and regulatory mechanism of Potassium Voltage-Gated Channel Subfamily E Regulatory Subunit 4 (KCNE4) in the radioresistance of CRC cells. METHODS: Immunohistochemical staining results of KCNE4 in normal tissues and CRC tissues were obtained from the Human Protein Atlas (HPA) database. The UALCAN database was used for analyzing KCNE4 mRNA expression in normal tissue samples and CRC tissue samples and its relationship with tumor stage. The relationship of KCNE4 expression with prognosis was analyzed utilizing the data of GEPIA database. LinkedOmics database was searched to analyze the co-expressed gene sets of KCNE4 in CRC, and to analyze the signaling pathways related with KCNE4 in CRC. GO and KEGG enrichment analyses were carried out on the co-expressed genes of KCNE4 with DAVID database. Ionizing radiation (IR)-resistant cell lines (HCT116/IR and HT29/IR) were established; cell viability was assessed via cell counting kit-8 (CCK-8) and EdU assays, and terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) assay was performed for detecting cell apoptosis. Western blotting was carried out to detect the expressions of p-p85 and p-AKT. RESULTS: KCNE4 was highly expressed in CRC tissues and linked to advanced tumor stage, lymph node metastasis and poor prognosis of CRC patients. KCNE4 overexpression promoted HCT116/IR cell proliferation and inhibited the apoptosis, while KCNE4 knockdown suppressed HT29/IR cell proliferation and facilitated the apoptosis. Furthermore, high KCNE4 expression was associated with the activation of the PI3K/AKT signal pathway. CONCLUSION: KCNE4 is associated with the clinicopathological characteristics of CRC patients, and its high expression level contributes to the radioresistance of cancer cells via activating the PI3K/AKT signal pathway.


Asunto(s)
Neoplasias Colorrectales , Canales de Potasio con Entrada de Voltaje , Humanos , Proteínas Proto-Oncogénicas c-akt/metabolismo , Fosfatidilinositol 3-Quinasas/metabolismo , Transducción de Señal , Células HCT116 , Proliferación Celular/genética , Neoplasias Colorrectales/genética , Neoplasias Colorrectales/radioterapia , Neoplasias Colorrectales/metabolismo , Línea Celular Tumoral , Regulación Neoplásica de la Expresión Génica , Canales de Potasio con Entrada de Voltaje/genética , Canales de Potasio con Entrada de Voltaje/metabolismo
20.
Ultrason Sonochem ; 99: 106577, 2023 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-37678064

RESUMEN

Rice bran protein (RBP)-tannic acid (TA) complex was prepared and the RBP-TA emulsions were subjected to ultrasonic treatment with different powers. Ultrasonic treatment has a positive effect on improving the properties of RBP-TA emulsion. This study investigated the influence of different ultrasonic power levels on the physicochemical properties, microstructure, rheological properties, and stability of emulsions containing RBP-TA. Under the ultrasonic treatment of 400 W, the particle size, zeta potential, and adsorbed protein content of the RBP-TA emulsion were 146.86 nm, -20.7 eV, and 61.91%, respectively. At this time, the emulsion had the best emulsifying properties, apparent viscosity, energy storage modulus and loss modulus. In addition, the POV and TBARS values of RBP-TA emulsions were 6.12 and 7.60 mmol/kg, respectively. The thermal, salt ion, pH and oxidative stability of the emulsions were investigated, and it was shown that ultrasonic treatment was effective in improving the stability of RBP-TA emulsions.


Asunto(s)
Oryza , Ultrasonido , Emulsiones , Taninos , Agua
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