Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 884
Filtrar
1.
J Colloid Interface Sci ; 677(Pt A): 35-44, 2025 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-39079214

RESUMEN

Amorphous carbon materials with sophisticated morphologies, variable carbon layer structures, abundant defects, and tunable porosities are favorable as anodes for potassium-ion batteries (PIBs). Synthesizing amorphous carbon materials typically involves the pyrolysis of carbonaceous precursors. Nonetheless, there is still a lack of studies focused on achieving multifaceted structural optimizations of amorphous carbon through precursor formulation. Herein, nitrogen-doped amorphous carbon nanotubes (NACNTs) are derived from a novel composite precursor of cobalt-based metal-organic framework (CMOF) and graphitic carbon nitride (g-CN). The addition of g-CN in the precursor optimizes the structure of amorphous carbon such as morphology, interlayer spacing, nitrogen doping, and porosity. As a result, NACNTs demonstrate significantly improved electrochemical performance. The specific capacities of NACNTs after cycling at current densities of 100 mA/g and 1000 mA/g increased by 194 % and 230 %, reaching 346.6 mAh/g and 211.8 mAh/g, respectively. Furthermore, the NACNTs anode is matched with an organic cathode for full-cell evaluation. The full-cell attains a high specific capacity of 106 mAh/gcathode at a current density of 100 mA/g, retaining 90.5 % of the specific capacity of the cathode half-cell. This study provides a valuable reference for multifaceted structural optimization of amorphous carbon to improve potassium-ion storage capability.

2.
ACS Nano ; 2024 Oct 04.
Artículo en Inglés | MEDLINE | ID: mdl-39365283

RESUMEN

The accumulation of nitrates in the environment causes serious health and environmental problems. The electrochemical nitrate reduction reaction (e-NO3RR) has received attention for its ability to convert nitrate to value-added ammonia with renewable energy. The key to effective catalytic efficiency is the choice of materials. Group VIII-based catalysts demonstrate great potential for application in e-NO3RR because of their high activity, low cost, and good electron transfer capability. This review summarizes the Group VIII catalysts, including monatomic, bimetallic, oxides, phosphides, and other composites. On this basis, strategies to enhance the intrinsic activity of the catalysts through coordination environment modulation, synergistic effects, defect engineering and hybridization are discussed. Meanwhile, the ammonia recovery process is summarized. Finally, the current research status in this field is prospected and summarized. This review aims to realize the large-scale application of nitrate electrocatalytic reduction in industrial wastewater.

3.
Heliyon ; 10(19): e38465, 2024 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-39391503

RESUMEN

Aims: Active health is a new concept, model, and system for maintaining a state of whole-person health. In the context of the increasing severity of college students' mental health, it is of great significance to explore the relationship between physical activity and college students' body image based on an active health perspective. Methods: A survey was conducted among 853 college students in Zhejiang province using the physical activity rating scale, body image scale, sense of acquisition of sports body shaping scale and social adjustment scale. Using SPSS25.0 and Amos 24.0 software for data processing and analysis. Results: (1) There is a significant positive correlation between physical activity, body image, sense of acquisition of sports body shaping, and social adjustment. There is a significant positive correlation between physical activity and body image among college students; The sense of acquisition of sports body shaping a significant mediating role between physical activity and the promotion of college students' body image. The effects of physical activity on body image were mainly achieved through the following three mediating pathways: (1) physical activity → sense of acquisition of sports body shaping → body image, the mediating effect value of this pathway was 0.18, which accounted for 31.6 % of the total effect, with a confidence interval of [0.08, 0.28], (2) physical activity → social adaptation → body image, the mediating effect value of this pathway was 0.09, which accounted for 15.8 % of the total effect of 15.8 %, with a confidence interval of [0.03, 0.15], and (3) physical activity → sense of acquisition of sports body shaping → social adaptation → body image, a pathway with a mediated effect value of 0.09, accounting for 15.8 % of the total effect, with a confidence interval of [0.01, 0.17]. Conclusions: Physical activity is an important factor in promoting the body image of college students, and there is a chain intermediary effect between physical activity and body image. School sport has its own disciplinary value and unique strengths in advancing the development of body image in adolescents, and the significant mediating effects of sense of acquisition of sports body shaping and social adaptation in this process provide theoretical support for the body image turn to move from theory to practice in the field of school sport.

4.
Food Chem ; 463(Pt 1): 141120, 2024 Sep 02.
Artículo en Inglés | MEDLINE | ID: mdl-39244995

RESUMEN

Accurate detection of organophosphate pesticides (OPs) is paramount for ensuring food safety. Dendritic mesoporous silica sphere was employed to confine gold nanoclusters (AuNCs@dmSiO2) to ameliorate fluorescent property of AuNCs. A AuNCs@dmSiO2-based fluorescent method was developed for OPs sensing. Identification of Cu2+ by AuNCs quenched AuNCs@dmSiO2 fluorescence. Interaction between Cu2+ and generated thiocholine in catalysis of acetylcholinesterase (AChE) caused fluorescence enhancement. OPs, an inhibitor of AChE, suppressed thiocholine production to cause fluorescence quenching. Based on fluorescent variation, a fluorescent method was proposed for OPs by selecting paraoxon as a model within range of 0.05-25.0 ng/mL with a limit of detection (LOD) of 0.032 ng/mL. Besides, a portable test swab was prepared for on-site monitoring OP paraoxon with a smartphone-based 3D-printing portable device with a LOD of 0.65 ng/mL. This work is highlighted by the inspiration of designing highly fluorescent AuNCs, and the provision of a viable avenue for OPs-related food analysis.

5.
Small ; : e2406448, 2024 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-39279302

RESUMEN

Designing nano-electrocatalysts rich in surface defects is critical to improve their catalytic performance. However, prevailing synthesis techniques rely heavily on complex procedures that compromise defect extensiveness and uniformity, casting a high demand for methods capable of synthesizing large-scale crystalline defects. An innovative design strategy is herein proposed that induces ample strain/dislocation defects during the growth of palladium (Pd), which is well-known as a good oxygen reduction reaction (ORR) catalyst. The controlled defect engineering on Pd core is achieved by the tensile stress exerted from an intentionally applied Fe3O4 skin layer during synthesis, which changes the surface free energy of Pd to stabilize the defect presence. With such large-scale crystalline defects, this Pd catalyst exhibits significantly higher ORR activity than commercial Pt/C, enabling its promising future in zinc-air battery catalysis. Additionally, the protective Fe3O4 skin covering the catalyst also enhances its catalytic stability. Theoretical calculations show that the superior catalytic property of such defect-engineered Pd is associated with the correspondingly modified adsorption energy of *O intermediates onto its surface, which further improves the reaction rate and thus boosts ORR kinetics. Findings here are expected to provide a paradigm for designing efficient and stable metal catalysts with plentiful large-scale strain defects.

6.
Lipids Health Dis ; 23(1): 291, 2024 Sep 10.
Artículo en Inglés | MEDLINE | ID: mdl-39256835

RESUMEN

BACKGROUND: Evidence is scarce on the effect of free fatty acid (FFA) level in the prognosis of coronary artery disease (CAD) patients with hypertension. This study. METHODS: A large prospective cohort study with a follow-up period of average 2 years was conducted at Xinjiang Medical University Affiliated First Hospital from December 2016 to October 2021. A total of 10,395 CAD participants were divided into groups based on FFA concentration and hypertension status, and then primary outcome mortality and secondary endpoint ischemic events were assessed in the different groups. RESULTS: A total of 222 all-cause mortality (ACMs), 164 cardiac mortality (CMs), 718 major adverse cardiovascular events (MACEs) and 803 major adverse cardiovascular and cerebrovascular events (MACCEs) were recorded during follow-up period. A nonlinear relationship between FFA and adverse outcomes was observed only in CAD patients with hypertension. Namely, a "U -shape" relationship between FFA levels and long-term outcomes was found in CAD patients with hypertension. Lower FFA level (< 310 µmol/L), or higher FFA level (≥ 580 µmol/L) at baseline is independent risk factors for adverse outcomes. After adjustment for confounders, excess FFA increases mortality (ACM, HR = 1.957, 95%CI(1.240-3.087), P = 0.004; CM, HR = 2.704, 95%CI(1.495-4.890, P = 0.001) and MACE (HR = 1.411, 95%CI(1.077-1.848), P = 0.012), MACCE (HR = 1.299, 95%CI (1.013-1.666), P = 0.040) prevalence. Low levels of FFA at baseline can also increase the incidence of MACE (HR = 1.567,95%CI (1.187-2.069), P = 0.002) and MACCE (HR = 1.387, 95%CI (1.070-1.798), P = 0.013). CONCLUSIONS: Baseline FFA concentrations significantly associated with long-term mortality and ischemic events could be a better and novel risk biomarker for prognosis prediction in CAD patients with hypertension. TRIAL REGISTRATION: The details of the design were registered on https://www.chictr.org.cn/ (Identifier NCT05174143).


Asunto(s)
Enfermedad de la Arteria Coronaria , Ácidos Grasos no Esterificados , Hipertensión , Humanos , Hipertensión/complicaciones , Hipertensión/sangre , Masculino , Femenino , Enfermedad de la Arteria Coronaria/mortalidad , Enfermedad de la Arteria Coronaria/complicaciones , Enfermedad de la Arteria Coronaria/sangre , Persona de Mediana Edad , Estudios Prospectivos , Ácidos Grasos no Esterificados/sangre , Anciano , Factores de Riesgo , Pronóstico
7.
ACS Appl Mater Interfaces ; 16(36): 47571-47580, 2024 Sep 11.
Artículo en Inglés | MEDLINE | ID: mdl-39223875

RESUMEN

To achieve large-scale hydrogen storage for growing high energy density and long-life demands in end application, the 2LiBH4-MgH2 (LMBH) reactive hydride system attracts huge interest owing to its high hydrogen capacity and thermodynamically favorable reversibility. The sluggish dehydrogenation kinetics and unsatisfactory cycle life, however, remain two challenges. Herein, a bimetallic titanium-niobium oxide with a two-dimensional nanoflake structure (2D TiNb2O7) is selected elaborately as an active precursor that in situ transforms into TiB2 and NbB2 with ultrafine size and good dispersion in the LMBH system as highly efficient catalysts, giving rise to excellent kinetic properties with long-term cycling stability. For the LMBH system added with 5 wt% 2D TiNb2O7, 9.8 wt% H2 can be released within 20 min at 400 °C, after which the system can be fully hydrogenated in less than 5 min at 350 °C and 10 MPa H2. Moreover, a dehydrogenation capacity of 9.4 wt% can be maintained after 50 cycles corresponding to a retention of 96%, being the highest reported to date. The positive roles of TiB2 and NbB2 for kinetics and recyclability are from their catalytic nucleation effects for MgB2, a main dehydrogenation phase of LMBH, thus reducing the apparent activation energy, suppressing the formation of thermostable Li2B12H12 byproducts, and inhibiting the hydride coarsening. This work develops an advanced LMBH system, bringing hope for high-capacity, fast-response, and long-life hydrogen energy storage.

8.
Heliyon ; 10(16): e35612, 2024 Aug 30.
Artículo en Inglés | MEDLINE | ID: mdl-39220966

RESUMEN

Background: While numerous studies have examined the influence of perineural dexamethasone on nerve block duration, its potential impact on postoperative nerve injury has not been adequately addressed. Objective: This study aims to elucidate the effect of perineural dexamethasone on nerve injury and nerve function recovery after surgery. Design: A prospective randomized double-blinded trial. Setting: The First Affiliated Hospital of Chengdu Medical College, Chengdu, China. The study was conducted between 14 June and 30 December 2022. Participants: Patients aged 18 - 80 years, ASA I - II, scheduled for elective orthopedic or burn and plastic surgery. Interventions: Patients were randomized to receive either perineural dexamethasone (D group) or no dexamethasone (ND group). Main outcome measures: Primary outcomes were the incidence and recovery of nerve injury. Secondary outcomes included postoperative pain scores, analgesic consumption, and adverse events. Results: Initial postoperative nerve injury rates were similar between groups (D: 30.4 %, ND: 33.3 %, P > 0.05). At 12 weeks post-discharge, significantly more patients in the ND group recovered from nerve deficits (78.8 % vs 60.3 %; OR = 2.45, 95 % CI = 1.05 - 5.72, P < 0.05). No significant differences were observed in postoperative hyperglycemia or surgical site infection rates. Conclusion: Perineural dexamethasone may impede nerve function recovery, suggesting caution in its use, particularly for patients with pre-existing nerve damage or diabetes. Further research is needed to elucidate the long-term effects of dexamethasone on nerve tissue recovery. Trial registration: chictr.org.cn, ChiCTR2200059424.

9.
J Org Chem ; 89(18): 13386-13400, 2024 Sep 20.
Artículo en Inglés | MEDLINE | ID: mdl-39258469

RESUMEN

A tandem cyclization reaction of enynones with tetrasulfides has been developed under manganese-promoted conditions, leading to the high-yield formation of various furanmethyl disulfides. This reaction is characterized by readily available starting materials, mild reaction conditions, and a broad substrate scope, making it attractive and practical. It provides a new strategy for the synthesis of disulfide-containing functionalized furans.

10.
Molecules ; 29(18)2024 Sep 18.
Artículo en Inglés | MEDLINE | ID: mdl-39339430

RESUMEN

The recent advancements of ionic liquids (ILs) and deep eutectic solvents (DESs) in the synthesis of cobalt-based catalysts for water splitting is reviewed. ILs and DESs possess unique physical and chemical properties, serving as solvents, templates, and reagents. Combined with calcination techniques, their advantages can be fully leveraged, enhancing the stability and activity of resulted catalysts. In these solvents, not only are they suitable for simple one-step calcination, but also applicable to more complex multi-step calcination, suitable for more complex reaction conditions. The designability of ILs and DESs allows them to participate in the reaction as reactants, providing metal and heteroatoms, simplifying the preparation system of cobalt phosphide, sulfide, and nitride. This work offers insights into design principles for electrocatalysts and practical guidance for the development of efficient and high-performance materials for hydrogen production and energy storage systems.

11.
J Transl Med ; 22(1): 852, 2024 Sep 20.
Artículo en Inglés | MEDLINE | ID: mdl-39304928

RESUMEN

BACKGROUND: The syncytiotrophoblast (SCT) layer in the placenta serves as a crucial physical barrier separating maternal-fetal circulation, facilitating essential signal and substance exchange between the mother and fetus. Any abnormalities in its formation or function can result in various maternal syndromes, such as preeclampsia. The transition of proliferative villous cytotrophoblasts (VCT) from the mitotic cell cycle to the G0 phase is a prerequisite for VCT differentiation and their fusion into SCT. The imprinting gene P57Kip2, specifically expressed in intermediate VCT capable of fusion, plays a pivotal role in driving this key event. Moreover, aberrant expression of P57Kip2 has been linked to pathological placental conditions and adverse fetal outcomes. METHODS: Validation of STK40 interaction with P57Kip2 using rigid molecular simulation docking and co-immunoprecipitation. STK40 expression was modulated by lentivirus in BeWo cells, and the effect of STK40 on trophoblast fusion was assessed by real-time quantitative PCR, western blot, immunofluorescence, and cell viability and proliferation assays. Co-immunoprecipitation, transcriptome sequencing, and western blot were used to determine the potential mechanisms by which STK40 regulates P57Kip2. RESULTS: In this study, STK40 has been identified as a novel interacting protein with P57Kip2, and its expression is down-regulated during the fusion process of trophoblast cells. Overexpressing STK40 inhibited cell fusion in BeWo cells while stimulating mitotic cell cycle activity. Further experiments indicated that this effect is attributed to its specific binding to the CDK-binding and the Cyclin-binding domains of P57Kip2, mediating the E3 ubiquitin ligase COP1-mediated ubiquitination and degradation of P57Kip2. Moreover, abnormally high expression of STK40 might significantly contribute to the occurrence of preeclampsia. CONCLUSIONS: This study offers new insights into the role of STK40 in regulating the protein-level homeostasis of P57Kip2 during placental development.


Asunto(s)
Fusión Celular , Inhibidor p57 de las Quinasas Dependientes de la Ciclina , Proteínas Serina-Treonina Quinasas , Trofoblastos , Ubiquitina-Proteína Ligasas , Ubiquitinación , Femenino , Humanos , Embarazo , Proliferación Celular , Inhibidor p57 de las Quinasas Dependientes de la Ciclina/metabolismo , Inhibidor p57 de las Quinasas Dependientes de la Ciclina/genética , Unión Proteica , Proteínas Serina-Treonina Quinasas/metabolismo , Proteínas Serina-Treonina Quinasas/genética , Proteolisis , Trofoblastos/metabolismo , Ubiquitina-Proteína Ligasas/metabolismo , Ubiquitina-Proteína Ligasas/genética
12.
Org Lett ; 2024 Sep 18.
Artículo en Inglés | MEDLINE | ID: mdl-39291854

RESUMEN

Herein, we reported a copper(0)-catalyzed reductive coupling of disulfurating reagents and (hetero)aryl/alkyl halides. Copper(0) can be directly inserted into tetrasulfide and then undergoes reductive coupling with (hetero)aryl Iodides to construct disulfide. The method features the unprecedented use of copper(0)-catalyzed disulfurating reagents (tetrasulfides) in cross-coupling chemistry and is convenient with broad substrate scopes, even applicable to different halogenated hydrocarbons. It is worth noting that the methodology is practical with the late-stage modification of bioactive scaffolds of pharmaceuticals. In the meantime, the synthesis of disulfides is successfully achieved on a gram scale, indicating the approach is highly valuable.

13.
Nanoscale ; 16(37): 17412-17418, 2024 Sep 26.
Artículo en Inglés | MEDLINE | ID: mdl-39219478

RESUMEN

It is difficult to achieve fast kinetics of Zn2+(H2O)6 desolvation as well as HER inertia at the same electrolyte/Zn interface during long-term cycling of Zn plating/stripping in aqueous Zn-ion batteries. Herein, an effective interface construction strategy with hydrophilic transition metal oxides was proposed to achieve that balance using a CeO2 layer coating. The hydrophilic CeO2 layer can bring a balance between improving the access to the anode surface for Zn2+(H2O)6 electrolyte ions, providing uniform Zn2+ nucleation sites and HER inertia. What's more, Zn corrosion can be significantly inhibited benefiting from this coating layer. The efficiency of aqueous Zn-ion batteries showed a great enhancement. Ultra-long plating/stripping stability up to 1600 h and excellent recovery (returning to 0.5 from 20 mA cm-2) for the symmetric CeO2@Zn system were observed. A full cell with the MnO2 cathode (CeO2@Zn//MnO2) with good reversibility and stability (∼600 cycles) was fabricated for practical application. Our work provides a fundamental understanding and an essential solution to deal with the balance between rapid desolvation and inhibition of the hydrogen evolution reaction, which is important for promoting the practical application of rechargeable Zn batteries.

14.
ChemistryOpen ; : e202400136, 2024 Aug 30.
Artículo en Inglés | MEDLINE | ID: mdl-39212272

RESUMEN

With the ever-growing global demand for sustainable energy solutions, hydrogen has garnered significant attention as a clean, efficient, and renewable energy source. In the field of hydrogen production, catalyst research stands out as one of the foremost areas of focus. In recent years, the preparation of electrocatalysts using ionic liquids (ILs) and deep eutectic solvents (DESs) has attracted widespread attention. ILs and DESs possess unique physicochemical properties and are recognized as green media as well as functional materials. Cobalt-based catalysts have proven to be efficient electrocatalysts for water splitting. Incorporating ILs or DESs into the preparation of cobalt-based catalysts offers a remarkable advantage by allowing precise control over their structural design and composition. This control directly influences the adsorption properties of the catalyst's surface and the stability of reaction intermediates, thereby enabling enhanced control over reaction pathways and product selectivity. Consequently, the catalytic activity and stability of cobalt-based catalysts can be effectively improved. In the process of preparing cobalt-based catalysts, ILs and DESs can serve as solvents and templates. Owing to the good solubility of ILs and DESs, they can efficiently dissolve raw materials and provide a special nucleation and growth environment, obtaining catalysts with novel-structures. The main focus of this review is to provide a detailed introduction to metal cobalt and its oxide/hydroxide derivatives in the field of water splitting, with a particular emphasis on the research progress achieved through the utilization of IL and DES. The aim is to assist readers in designing and synthesizing novel and high-performance electrochemical catalysts.

15.
Phytomedicine ; 133: 155953, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39154527

RESUMEN

BACKGROUND: Mycoplasma gallisepticum (MG) has long been a pathogenic microorganism threatening the global poultry industry. Previous studies have demonstrated that the mechanism by which quercetin (QUE) inhibits the colonization of MG in chicks differs from that of antibiotics. However, the molecular mechanism by which QUE facilitates the clearance of MG remains unclear. PURPOSE: The aim of this study was to investigate the molecular mechanism of MG clearance by QUE, with the expectation of providing new options for the treatment of MG. METHODS: A model of MG infection in chicks and MG-induced M1 polarization in HD-11 cells were established. The mechanism of QUE clearance of MG was investigated by evaluating the relationship between tracheal mucosal barrier integrity, antibody levels, Th1/Th2 immune balance and macrophage metabolism and M1/M2 polarization balance. Furthermore, network pharmacology and molecular docking techniques were employed to explore the potential molecular pathways connecting QUE, M2 polarization, and fatty acid oxidation (FAO). RESULTS: The findings indicate that QUE remodels tracheal mucosal barrier function by regulating tight junctions and secretory immunoglobulin A (sIgA) expression levels. This process entails the regulatory function of QUE on the Th1/Th2 immune imbalance that is induced by MG infection in the tracheal mucosa. Moreover, QUE intervention impeded the M1 polarization of HD-11 cells induced by MG infection, while simultaneously promoting M2 polarization through the induction of FAO. Conversely, inhibitors of the FAO pathway impede this effect. The results of computer network analysis suggest that QUE may induce FAO via the PI3K/AKT pathway to promote M2 polarization. Notably, inhibition of the PI3K/AKT pathway was found to effectively inhibit M2 polarization in HD-11 cells, while having a limited effect on FAO. CONCLUSIONS: QUE promotes M2 polarization of HD-11 cells to enhance Th2 immune response through FAO and PI3K/AKT pathways, thereby restoring tracheal mucosal barrier function and ultimately inhibiting MG colonization.


Asunto(s)
Pollos , Infecciones por Mycoplasma , Mycoplasma gallisepticum , Enfermedades de las Aves de Corral , Quercetina , Células Th2 , Animales , Quercetina/farmacología , Mycoplasma gallisepticum/efectos de los fármacos , Infecciones por Mycoplasma/tratamiento farmacológico , Infecciones por Mycoplasma/inmunología , Enfermedades de las Aves de Corral/tratamiento farmacológico , Enfermedades de las Aves de Corral/inmunología , Células Th2/efectos de los fármacos , Células Th2/inmunología , Mucosa Respiratoria/efectos de los fármacos , Mucosa Respiratoria/inmunología , Tráquea/efectos de los fármacos , Simulación del Acoplamiento Molecular , Uniones Estrechas/efectos de los fármacos , Inmunoglobulina A Secretora/metabolismo , Fosfatidilinositol 3-Quinasas/metabolismo , Células TH1/efectos de los fármacos , Células TH1/inmunología , Macrófagos/efectos de los fármacos , Ácidos Grasos
16.
Nat Commun ; 15(1): 7362, 2024 Aug 27.
Artículo en Inglés | MEDLINE | ID: mdl-39191725

RESUMEN

We evaluate deconvolution methods, which infer levels of immune infiltration from bulk expression of tumor samples, through a community-wide DREAM Challenge. We assess six published and 22 community-contributed methods using in vitro and in silico transcriptional profiles of admixed cancer and healthy immune cells. Several published methods predict most cell types well, though they either were not trained to evaluate all functional CD8+ T cell states or do so with low accuracy. Several community-contributed methods address this gap, including a deep learning-based approach, whose strong performance establishes the applicability of this paradigm to deconvolution. Despite being developed largely using immune cells from healthy tissues, deconvolution methods predict levels of tumor-derived immune cells well. Our admixed and purified transcriptional profiles will be a valuable resource for developing deconvolution methods, including in response to common challenges we observe across methods, such as sensitive identification of functional CD4+ T cell states.


Asunto(s)
Linfocitos T CD4-Positivos , Linfocitos T CD8-positivos , Neoplasias , Humanos , Linfocitos T CD8-positivos/metabolismo , Linfocitos T CD4-Positivos/metabolismo , Neoplasias/genética , Neoplasias/inmunología , Neoplasias/patología , Perfilación de la Expresión Génica/métodos , Transcriptoma , Aprendizaje Profundo , Biología Computacional/métodos , Linfocitos Infiltrantes de Tumor/inmunología , Regulación Neoplásica de la Expresión Génica
17.
J Colloid Interface Sci ; 678(Pt A): 272-280, 2024 Aug 24.
Artículo en Inglés | MEDLINE | ID: mdl-39197370

RESUMEN

Developing highly efficient electrocatalyst with heterostructure for hydrogen evolution and oxidation reactions (HER/HOR) in alkaline media is crucial to the fabrication and conversion of hydrogen energy but also remains a great challenge. Herein, the synthesis of ruthenium-nickel nanoparticles (Ru3-Ni NPs) with heterostructure for hydrogen electrocatalysis is reported, and studies show that their catalytic activity is improved by electron redistribution caused by the distinctly heterogeneous interface. Impressively, Ru3-Ni NPs possess the remarkable exchange current density (2.22 mA cm-2) for HOR. Additionally, an ultra-low overpotential of 28 mV is required to attain a current density of 10 mA cm-2 and superior stability of 200 h for HER. The highly efficient catalytic activity can be attributed to the electron transfer from Ni to Ru and the optimal adsorption of H* on Ru-Ni sites. Our study showcases a reliable heterostructure that boosts the HOR/HER activity of the catalyst in alkaline environments. This work provides a new pathway for designing high-performance electrocatalyst for energy storage and conversion.

18.
Front Cell Neurosci ; 18: 1429977, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39131043

RESUMEN

Parkinson's disease (PD) is a prevalent neurodegenerative disorder that affects the central nervous system (CNS). Neuroinflammation is a crucial factor in the pathological advancement of PD. PD is characterized by the presence of activated microglia and increased levels of proinflammatory factors, which play a crucial role in its pathology. During the immune response of PD, microglia regulation is significantly influenced by microRNA (miRNA). The excessive activation of microglia, persistent neuroinflammation, and abnormal polarization of macrophages in the brain can be attributed to the dysregulation of certain miRNAs. Additionally, there are miRNAs that possess the ability to inhibit neuroinflammation. miRNAs, which are small non-coding epigenetic regulators, have the ability to modulate microglial activity in both normal and abnormal conditions. They also have a significant impact on promoting communication between neurons and microglia.

19.
Sci Total Environ ; 951: 175641, 2024 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-39168336

RESUMEN

The extensive use of the antibiotic oxytetracycline (OTC) has led to considerable environmental contamination and other negative impacts, prompting an urgent need for a green, effective, and innovative OTC adsorption material. In this study, diatom-allophane bio-nanocomposites were synthesized using a simple and eco-friendly method, yielding a homogeneous coating of allophane nanoparticles on diatom surfaces. The resultant bio-nanocomposites were found to have hierarchically porous structures and abundant active sites derived from successful allophane loading and dispersion on diatom surfaces. The OTC adsorption capacity of this novel adsorbent is remarkable (219.112 mg·g-1), surpassing the capacities of raw allophane and diatoms by >5 and 10 times, respectively. Mechanistically, OTC adsorption by the bio-nanocomposites was found to be driven primarily by chemisorption through a process involving complexation between the amide and amino groups on OTC and the aluminum hydroxyl and carboxyl groups on the adsorbent surface. Electrostatic interactions and hydrogen bonding also contribute significantly to OTC capture. Furthermore, the diatom-allophane bio-nanocomposites exhibit excellent performance over a wide pH range (4-7), in the presence of various cations (Na+, K+, Ca2+, Mg2+) and anions (Cl-, NO3-, SO42-), and in real water bodies. These findings demonstrate the potential of the diatom-allophane bio-nanocomposite as a green, efficient, and promising biological-mineral adsorbent for environmental remediation, leveraging the combined utilization of biological and mineral resources.


Asunto(s)
Diatomeas , Nanocompuestos , Oxitetraciclina , Contaminantes Químicos del Agua , Oxitetraciclina/química , Adsorción , Contaminantes Químicos del Agua/química , Nanocompuestos/química , Antibacterianos/química , Tecnología Química Verde
20.
Plant Cell ; 2024 Aug 21.
Artículo en Inglés | MEDLINE | ID: mdl-39167833

RESUMEN

Autoluminescent plants have been genetically modified to express the fungal bioluminescence pathway (FBP). However, a bottleneck in precursor production has limited the brightness of these luminescent plants. Here, we demonstrate the effectiveness of utilizing a computational model to guide a multiplex five-gene-silencing strategy by an artificial microRNA array to enhance caffeic acid and hispidin levels in plants. By combining loss-of-function-directed metabolic flux with a tyrosine-derived caffeic acid pathway, we achieved substantially enhanced bioluminescence levels. We successfully generated eFBP2 plants that emit considerably brighter bioluminescence for naked-eye reading by integrating all validated DNA modules. Our analysis revealed that the luminous energy conversion efficiency of the eFBP2 plants is currently very low, suggesting that luminescence intensity can be improved in future iterations. These findings highlight the potential to enhance plant luminescence through the integration of biological and information technologies.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA