Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 16 de 16
Filtrar
Más filtros










Base de datos
Intervalo de año de publicación
1.
J Colloid Interface Sci ; 669: 569-577, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-38729005

RESUMEN

The capacitance of a co-catalyst can be likened to a "double-edged sword". Α co-catalysts with high capacitance can store photoexcited electrons, thereby facilitating charge separation within the host catalyst. However, this property simultaneously restricts electron release. Both effects are enhanced with an increasing capacitance value, implying that excessively high capacitance can significantly hinder the photocatalytic hydrogen (H2) production reaction. Herein, we have designed a metal-organic framework (MOF) -derived carbon-coated nickel phosphide (C-Ni5P4) as the co-catalyst of cadmium sulfide (CdS). When C-Ni5P4 and CdS are closely interconnected, electrons spontaneously migrate from CdS to C-Ni5P4 under irradiation due to the higher work function (WF) of C-Ni5P4 compared to CdS. Most importantly, although the WF of C-Ni5P4 is 0.1 eV lower than that of Ni5P4, its specific capacitance (1.2 mF/cm2) is also lower than that of Ni5P4 (1.3 mF/cm2). This difference dramatically promotes electron release. Thereby exerting a strong positive effect on capacitance catalysis. Therefore, 7% C-Ni5P4/CdS exhibits exceptional cyclic stability and has a remarkably high activity level of 12283 µmol/h/g and 3.8 times as many as 3.0 %Ni5P4/CdS. This study provides a theoretical basis for the advancement of photocatalysts with high efficiency in H2 production and is expected to be applied in other fields of photocatalysis.

2.
Neuropsychiatr Dis Treat ; 20: 855-862, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38628602

RESUMEN

Objective: We explored the correlation between the presence of isocitrate dehydrogenase-1 (IDH1) mutations and the incidence of postoperative epilepsy in patients with glioblastoma, as well as assessed the efficacy of preemptive administration of antiepileptic medications in mitigating the occurrence of postoperative epilepsy. Methods: Fifty-three patients who received a postoperative pathological diagnosis of glioblastoma, were enrolled in this study. Tumor specimens were subjected to IDH1 gene analysis. The patient cohort was stratified based on their IDH1 mutation status and the administration of prophylactic antiepileptic drugs during the postoperative phase. We subsequently conducted a comparative analysis of postoperative epileptic complications within each patient subgroup. Results: In the cohort of 53 patients under study, the occurrence of epilepsy was observed in 10 out of 21 patients carrying IDH1 mutations, while 5 out of 32 patients with wild-type IDH1 also experienced epilepsy, revealing a statistically significant difference (P < 0.05). Among the 27 patients who received prophylactic antiepileptic drugs, 6 of them developed epilepsy, whereas 9 out of 26 patients who did not receive prophylactic antiepileptic drugs exhibited concurrent epilepsy, with no statistically significant difference (P > 0.05). However, when performing a subgroup analysis, it was found that 3 out of 12 patients with IDH1 mutations who received prophylactic antiepileptic drugs experienced epilepsy, whereas 7 out of 9 patients who did not receive prophylactic antiepileptic drugs developed epilepsy, demonstrating a statistically significant difference (P < 0.05). Furthermore, within the group of 15 patients with wild-type IDH1, 3 patients who received prophylactic antiepileptic drugs developed epilepsy, while 2 cases of epilepsy occurred among the 17 patients who did not receive prophylactic antiepileptic drugs, with no statistically significant difference (P > 0.05). Conclusion: In individuals with IDH1 mutant glioblastoma who have undergone surgical resection, the implementation of preventive antiepileptic therapy demonstrates a potential to diminish the occurrence of postoperative epilepsy.

3.
Prev Med ; 174: 107633, 2023 09.
Artículo en Inglés | MEDLINE | ID: mdl-37473923

RESUMEN

Prevention is more important than treatment, and the incidence of intracerebral hemorrhage can be effectively reduced by intervening on the risk factors of intracerebral hemorrhage. By studying the risk factors of spontaneous intracerebral hemorrhage, we can identify the risk factors to achieve the target of treatment and prevention. Through the use of the Least Absolute Shrinkage and Selection Operator (LASSO) and the Support Vector Machine (SVM), the two essential SICH-related genes, NUAK1 and ERO1L, were eliminated from consideration. A Venn analysis was performed, and based on the two important modules, it found that SICH was related with four critical genes: VCM1, CRNDE, COL6A2, and HSPB6. One gene (NUAK1) was dramatically downregulated in the illness group compared to the control group, whereas three essential genes (ERO1L, VCAM1, and COL6A2) were significantly upregulated in the disease group. In the end, the genes ERO1L, VCAM1, COL6A2, and NUAK1 were shown to be the most important ones for SICH. It is anticipated that these genes will become novel biomarkers as well as targets for the development of new pharmacotherapies for SICH.


Asunto(s)
Hemorragia Cerebral , Máquina de Vectores de Soporte , Humanos , Hemorragia Cerebral/genética , Hemorragia Cerebral/epidemiología , Factores de Riesgo , Biomarcadores , Proteínas Quinasas , Proteínas Represoras
4.
Prev Med ; 173: 107565, 2023 08.
Artículo en Inglés | MEDLINE | ID: mdl-37268172

RESUMEN

As a chronic neurological disorder, epilepsy (EP) is characterized with recurrent and unexplained epileptic seizures. Mounting evidence demonstrated that long non-coding RNAs (lncRNAs) are associated with EP. This paper intended to study the role and mechanisms of OIP5 antisense RNA 1 (OIP5-AS1) in EP.Quantitative real-time polymerase chain reaction (qRT-PCR) was used to analyze relative RNA level. Cell viability was unclosed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) experiment. The activity of caspase-3/9 was investigated to measure cell apoptosis. Subcellular fractionation assay was carried out to uncover the subcellular location. RNA pulldown, luciferase reporter and RNA-binding protein immunoprecipitation (RIP) assays were applied to disclose the underlying mechanisms of OIP5-AS1.Result shows OIP5-AS1 is overexpressed in EP cell models and mainly located in cytoplasm. OIP5-AS1 knockdown impairs cell apoptosis in EP cell models. OIP5-AS1 regulates cell apoptosis in EP cell models by binding to microRNA-128-3p (miR-128-3p). OIP5-AS1 interacts with miR-128-3p to overexpress BCL2-Associated X (BAX), thereby modulating cell apoptosis in EP cell models.OIP5-AS1 accelerates apoptosis of hippocampal neurons in cell models of EP by modulating miR-128-3p/BAX axis. Investigating OIP5-AS1/miR-128-3p/BAX regulatory axis can contribute to deepening the understanding of EP.


Asunto(s)
Epilepsia , MicroARNs , Humanos , Proteína X Asociada a bcl-2 , MicroARNs/genética , MicroARNs/metabolismo , Neuronas/metabolismo , Epilepsia/genética , Apoptosis/genética
6.
Physiol Mol Biol Plants ; 29(4): 543-557, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-37187770

RESUMEN

Soil salinization has become one of the major abiotic stresses influencing food security and maintenance of sustainable eco-environment. Highly salt-tolerant germplasm in mulberry, an important perennial woody plant, could restore the ecology and increase the agricultural income. Studies on the salt tolerance of mulberry are limited. Therefore, the aim of this study was to estimate the genetic variation and develop a reliable and effective evaluation of salt tolerance in 14 F1 mulberry hybrids that were directionally constructed using nine genotypes, including two females and seven males. A salt stress test was performed using 0.3%, 0.6%, and 0.9% (w/v) NaCl to investigate four morphological indexes of the growth rate: the shoot height (SHR), leaf number (LNR), leaf area (LAR), and the total weight of the whole plant after defoliation (BI) in the seedlings of the 14 combinations. The most suitable concentration for evaluating salt tolerance was identified as 0.9% NaCl based on the changes in the salt tolerance coefficient (STC). Comprehensive evaluation (D) values were obtained using principal components and membership functions based on four morphological indexes and their STCs, grouped into three principal component indexes cumulatively contributing to approximately 88.90% of the total variance. Two highly salt-tolerant, three moderately salt-tolerant, five salt-sensitive, and four highly salt-sensitive genotypes were screened. Anshen × Xinghainei and Anshen × Xinghaiwai had the highest D values. The analyses of combining ability further showed that the variances for LNR, LAR, and BI were elevated significantly with the increasing NaCl concentrations. Anshen × Xinghainei from two superior parents (female: Anshen, male: Xinghainei) with relatively higher general combing abilities for SHR, LAR, and BI was the best hybrid combination under high salinity stress, and presented the best specific combining ability for BI. Of all the traits tested, LAR and BI were greatly affected by additive effects and might be the two most reliable indexes. These traits show higher correlation with the salt tolerance of mulberry germplasm at the seedling stage. These results may enrich the mulberry resources by breeding and screening for elite germplasms with high salt tolerance. Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-023-01304-w.

7.
J Colloid Interface Sci ; 633: 649-656, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-36473355

RESUMEN

The (noble metal/non-noble metal)/semiconductor are efficient and attractive ternary photocatalysts for photocatalytic hydrogen evolution. To deeply understand the advantages of ternary photocatalysts, the physicochemical characteristics of both the whole ternary photocatalysts and each part of that must be revealed. Herein, we design (Pd/WP) as a co-catalyst loaded on CdS to form ternary photocatalysts (Pd/WP)/CdS. The (0.05%Pd/4%WP)/CdS exhibits a high hydrogen evolution activity of 18.0 mmol/h/g, which is 1.5 times of WP/CdS, 2.2 times of Pd/CdS, and 6.4 times of pure CdS. Additionally, photoelectrochemical tests demonstrate that (Pd/WP)/CdS has appropriate capacitance, excellent conductivity and strong catalytic ability, which can inhibit the recombination of photo-excited carries and boost hydrogen evolution. Especially, ultraviolet photoelectron spectroscopy (UPS) tests show that the conduction band (CB) position of (Pd/WP)/CdS can be regulated successfully through synergistic effect of Pd, WP, and CdS. This study not only reveals the physicochemical properties of ternary photocatalysts from a holistic perspective, but also provides a pathway for hydrogen evolution of scientific and economic interest.


Asunto(s)
Hidrógeno , Semiconductores , Hidrógeno/química , Catálisis
8.
Ann Transl Med ; 10(16): 888, 2022 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-36111008

RESUMEN

Background: An inhibitor of apoptosis (IAP) family member, baculoviral IAP repeat containing five (BIRC5) plays an important role in the occurrence and development of tumors. However, the underlying mechanism in human cancers remains unclear. Methods: In this study, we investigated BIRC5 expression and explored the prognostic value of BIRC5 in different human cancers via bioinformatics analysis, including the databases of Oncomine, Gene Expression Profiling Interactive Analysis (GEPIA), UALCAN, GEPIA, DriverDBv3, GeneMANIA, WEB-based Gene Set Analysis Tool (WebGestalt) and TIMER. Results: In most human cancers, BIRC5 usually had higher expression compared to normal human tissues. High expression of BIRC5 could increase the mortality of patients with adrenocortical carcinoma (ACC), kidney renal clear cell carcinoma (KIRC), low-grade glioma (LGG), liver hepatocellular carcinoma (LIHC), and lung adenocarcinoma (LUAD) (P<0.05). Cox analysis demonstrated that high BIRC5 expression was an independent factor for poor overall survival (OS) [hazard ratio, (HR) >1, P<0.05]. There were differences in BIRC5 expression in the case of TP53 mutation, different tumor grades, and stages. Interactive genes for BIRC5 mainly participated in apoptosis, cell division, cell cycle, and cancer pathways, strongly suggesting its oncogenic role in promoting cancer cell proliferation and cancer development. In addition, BIRC5 expression exhibited a close correlation with immune infiltration, which was related to the cumulative survival rate, especially in LGG. The elevated expression of BIRC5 could be regulated through TP53 mutation, tumor stage, and tumor grade (P<0.05). Conclusions: As a result of our findings, BIRC5 appears to be an independent unfavourable prognostic biomarker in human cancers. BIRC5 may become a potential clinical target in the future for the treatment of cancers.

9.
Chemistry ; 28(28): e202200019, 2022 May 16.
Artículo en Inglés | MEDLINE | ID: mdl-35266216

RESUMEN

Transition metal Fe, Co, Ni and Cu doped strontium titanate-rich SrTiO3 @TiO2 (STO@T) materials were prepared by hydrothermal method. The prepared doped materials exhibit better photocatalytic CO2 reduction to CH4 ability under visible light conditions. Among them, Fe-doped and undoped SrTiO3 @TiO2 under visible light conditions CO2 reduction products only CO, while M-STO@T (M=Co, Ni, Cu) samples converted CO2 to CH4 . The average methane yield of Ni-doped STO@T samples are as high as 73.85 µmol g-1 h-1 . The production of methane is mainly due to the increase in the response of the doped samples to visible light. And the increase in the separation rate of photogenerated electrons and holes and the efficiency of electron transport caused by the generation of impurity levels. The impurity level caused by Ti3+ plays an important role in the production of methane by CO2 visible light reduction. Ni doping effectively improves the photocatalytic performance of STO@T and CO2 reduction mechanism were explained.

10.
Front Oncol ; 11: 621154, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33718179

RESUMEN

High levels of microvessel density (MVD) indicate poor prognosis in patients with malignant glioma. Leucine-rich repeats and immunoglobulin-like domains (LRIG) 3, a potential tumor suppressor, plays an important role in tumor progression and may serve as a biomarker in many human cancers. However, its role and underlying mechanism of action in glioma angiogenesis remain unclear. In the present study, we used loss- and gain-of-function assays to show that LRIG3 significantly suppressed glioma-induced angiogenesis, both in vitro and in vivo. Mechanistically, LRIG3 inhibited activation of the PI3K/AKT signaling pathway, downregulating vascular endothelial growth factor A (VEGFA) in glioma cells, thereby inhibiting angiogenesis. Notably, LRIG3 had a significant negative correlation with VEGFA expression in glioma tissues. Taken together, our results suggest that LRIG3 is a novel regulator of glioma angiogenesis and may be a promising option for developing anti-angiogenic therapy.

11.
ChemSusChem ; 11(22): 3871-3881, 2018 Nov 23.
Artículo en Inglés | MEDLINE | ID: mdl-30207091

RESUMEN

Photocatalytic hydrogen production by using solar energy has attracted great interest around the world. The main challenges are the high costs of the photocatalysts and the low efficiency of photocatalytic hydrogen production. Co-catalysts, as crucial components of photocatalysts, are usually used to stimulate photoexcited electron transfer from the light absorber to the surface, and they also catalyze the proton-reduction reaction to form H2 in water. However, most co-catalysts used in photocatalytic hydrogen production are noble metals, which are expensive and contradict the low-costs demanded by industry. Therefore, the development of earth-abundant and cheap co-catalysts to replace noble metals is necessary for photocatalytic H2 production. This account highlights the performance and roles of molybdenum-based non-noble metal co-catalysts in photocatalytic hydrogen production. We developed a series of inexpensive and efficient molybdenum-based co-catalysts. We demonstrated that more H2 could be produced by loading Mo-based co-catalysts on CdS by using the co-precipitation method than by using traditional Pt/CdS same under the same photocatalytic conditions. The molybdenum-based co-catalysts were able to form heterojunctions, which served as bridges to facilitate the transport and separation of photogenerated charges; moreover, the molybdenum-based co-catalysts were able to accept and store photoexcited electrons owing to their large specific capacitance. The stored photoelectrons could then be released according to proton-reduction processes to form H2 . Furthermore, the molybdenum-based co-catalysts were found to have metastable state structures and multiple valence states, which provided more active sites and effectively catalyzed the production of H2 and inhibited the reverse reaction. The discovery of Mo-based co-catalysts with superior properties will provide guidance for the design of new co-catalysts.

12.
RSC Adv ; 8(62): 35753-35758, 2018 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-35547890

RESUMEN

Here, we reported a new method for fast and safe synthesis of a micron germanium (Ge) semiconductor. The Ge was successfully prepared from mixed GeO2 with a low amount of MoO3 by the NH3 reduction method at 800 °C for an ultra-short time of 10 min. XRD patterns show that the Ge has a tetragonal structure. SEM images show that the size of the Ge particles is from 5 µm to 10 µm, and so it is on the micron scale. UV-visible diffuse reflectance spectroscopy shows that the Ge has good light absorption both in the ultraviolet and visible regions. The formation of Ge mainly goes through a two-step conversion in the NH3 flow. Firstly, GeO2 is converted to Ge3N4, and then Ge3N4 is decomposed to generate Ge. The comparison experiments of MoO3 and Mo2N demonstrate that Mo2N is the catalyst for the Ge synthesis which improves the Ge3N4 decomposition. The presented fast and safe synthesis method of Ge has great potential for industrialization and the proposed Mo2N boosting the Ge3N4 decomposition has provided significant guidance for other nitride decomposition systems.

13.
ChemSusChem ; 9(8): 820-4, 2016 04 21.
Artículo en Inglés | MEDLINE | ID: mdl-26934039

RESUMEN

Co-catalysts are a major factor to enhance photocatalytic H2 activity; they are mainly composed of expensive noble metals. Here, we reported a new non-noble-metal co-catalyst Mo2 C that efficiently improves the photocatalytic H2 evolution of CdS under visible light irradiation. Mo2 C is prepared by temperature-programmed reaction with molybdenum oxide as precursor, and the Mo2 C/CdS composite is prepared by deposition of CdS on Mo2 C. The optimum composite 2.0 % Mo2 C/CdS shows a high H2 evolution rate of 161 µmol h(-1) , which is ten times higher than that of CdS alone and 2.3 times higher than the optimum for 1.0 % Pt/CdS. Moreover, the Mo2 C/CdS is stable for 50 h. This study presents a new low-cost non-noble-metal co-catalyst as a photocatalyst to achieve highly efficient H2 evolution.


Asunto(s)
Compuestos de Cadmio/química , Hidrógeno/química , Molibdeno/química , Compuestos de Selenio/química , Compuestos de Cadmio/efectos de la radiación , Catálisis , Luz , Molibdeno/efectos de la radiación , Compuestos de Selenio/efectos de la radiación
14.
Bioresour Technol ; 167: 133-6, 2014 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-24976491

RESUMEN

Liquid sulphuric acid is adopted and compared with carbon-based sulfonated solid acids (coal tar-based and active carbon-based) for furfural residues conversion into reducing sugars. The optimum hydrolysis conditions of liquid acid are at 4% of sulphuric acid, 25:1 of liquid and solid ratio, 175°C of reaction temperature and 120 min of reaction time. The reducing sugar yields are reached over 60% on liquid acid via NaOH/H2O2, NaOH/microwave and NaOH/ultrasonic pretreatments, whereas only over 30% on solid acids. The TOFs (turnover number frequency) via NaOH/H2O2 pretreatments are 0.093, 0.020 and 0.023 h(-1) for liquid sulphuric acid, coal tar-based and active carbon-based solid acids catalysts, respectively. Considering the efficiency, cost and environment factors, the liquid and solid acids have their own advantages of potential commercial application values.


Asunto(s)
Carbohidratos/química , Furaldehído/metabolismo , Ácidos Sulfúricos/farmacología , Catálisis/efectos de los fármacos , Hidrólisis/efectos de los fármacos , Temperatura , Factores de Tiempo
15.
PLoS One ; 9(3): e91444, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24614159

RESUMEN

OBJECTIVE: To study anatomical structures related to Meckel cave with endonasal endoscopic approach and to provide an anatomical basis for endoscopic surgery in Meckel cave. METHODS: Meckel cave of 5 adult skulls (10 sides) were fixed with 10% formalin. The anatomical structures of Meckel cave and the related zones adjacent to Meckel cave were observed and measured with endoscopic endonasal approach. RESULTS: Endoscopic endonasal, endo-maxillary sinus, and endo-pterygoid process approaches were successfully applied in observation of the anatomical structures of meckel cave and the rerated zones adjacent to Meckel cave and in measurement of distances between related anatomical structures for each case of samples. The relevant data were obtained. The distance between the front mouth of palatovaginal canal and vidian canal was 21.4±7 mm, the distance between opening of sphenoid sinus to the upper margin of the choana was 22.3±2.8 mm, the distance between the opening of vidian and foramen rotundum was 7.57±0.7 mm and the length of the pterygoid canal was 13.3±1.2 mm. Based on these data, the positions of the related important structures can be roughly located during surgical operation and various important structures in Meckel cave and its adjacent zones can be found out in a convenient and safe way. CONCLUSION: 1) It is feasible to use endonasal endoscopic approach to perform surgical operation in Meckel cave; 2) Use of endonasal endoscopic approach can protect and fully take the advantage of the vidian nerve to locate the position of foramina lacerum of the internal carotid artery during surgical operation; and 3) the observational and experimental data obtained with this approach can provide the rational basis for clinical operation procedures.


Asunto(s)
Endoscopía , Seno Maxilar/anatomía & histología , Nariz/anatomía & histología , Músculos Pterigoideos/anatomía & histología , Cráneo/anatomía & histología , Adulto , Humanos , Cráneo/diagnóstico por imagen , Tomografía Computarizada por Rayos X
16.
Epilepsy Behav Case Rep ; 1: 77-8, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-25667834

RESUMEN

Nonketotic hyperglycemia-related seizures (NKH) are rare. We report a case of NKH-related seizures in a patient following a traumatic brain injury.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...