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1.
Epilepsy Behav ; 143: 109243, 2023 06.
Artículo en Inglés | MEDLINE | ID: mdl-37182501

RESUMEN

PURPOSE: This study evaluated medical students' knowledge and attitudes toward epilepsy and the influence of metacognition thereon. METHOD: Valid questionnaires were administered to medical students including undergraduate, professional postgraduate, and standardized residency training students (N = 503). The questionnaire had 4 parts: demographic information, knowledge of epilepsy, attitudes toward epilepsy, and metacognitive assessment. The Chinese Public Attitudes Toward Epilepsy scale and 30-Item Metacognition Questionnaire were used to assess attitudes and metacognition, respectively. RESULTS: Almost all participants had heard of epilepsy; 38.8% had witnessed a seizure and 25% were acquainted with a person with epilepsy. The proportion of correct answers to epilepsy-related knowledge ranged from 40.6% (Putting an object into the mouth of a person experiencing an epileptic seizure) to 97% (Convulsion is a symptom of epilepsy). However, knowledge of epilepsy was not able to affect attitudes toward epilepsy. Age, years of clinical experience, having witnessed a seizure, positive belief of worry, and need to control thinking were correlated with the different domains of attitude toward epilepsy. When participants were divided into 2 groups-i.e., those with high and low knowledge of epilepsy, participants in the former group who had a positive belief of worry or had not witnessed any seizures were more likely to have negative attitudes toward epilepsy. CONCLUSION: Medical students showed good awareness of the etiology and symptoms of epilepsy. Overall, attitudes toward epilepsy were negative. A positive belief of worry was associated with a more negative attitude toward epilepsy among respondents with greater knowledge of epilepsy.


Asunto(s)
Epilepsia , Metacognición , Estudiantes de Medicina , Humanos , Conocimientos, Actitudes y Práctica en Salud , Epilepsia/complicaciones , Epilepsia/psicología , Convulsiones , Encuestas y Cuestionarios
2.
Nano Lett ; 22(10): 4232-4239, 2022 05 25.
Artículo en Inglés | MEDLINE | ID: mdl-35533211

RESUMEN

Picturing the atomic migration pathways of catalysts in a reactive atmosphere is of central significance for uncovering the underlying catalytic mechanisms and directing the design of high-performance catalysts. Here, we describe a reduction-controlled atomic migration pathway that converts nanoparticles to single atom alloys (SAAs), which has remained synthetically challenging in prior attempts due to the elusive mechanism. We achieved this by thermally treating the noble-metal nanoparticles M (M = Ru, Rh, Pd, Ag, Ir, Pt, and Au) on metal oxide (CuO) supports with H2/Ar. Atomic-level characterization revealed such conversion as the synergistic consequence of noble metal-promoted H2 dissociation and concomitant CuO reduction. The observed atomic migration pathway offers an understanding of the dynamic mechanisms study of nanomaterials formation and catalyst design.


Asunto(s)
Aleaciones , Nanopartículas del Metal , Catálisis
3.
Environ Res ; 212(Pt D): 113450, 2022 09.
Artículo en Inglés | MEDLINE | ID: mdl-35598802

RESUMEN

The steel slag was investigated for the removal of p-nitrophenol (4-NP) from simulated sewage by batch adsorption and fixed-bed column absorption experiments. The results showed that the maximum adsorption capacity was 109.66 mg/g at 298 K, pH of 7, initial concentration 100 mg/L, and dose 0.8 g/L. The adsorption process fitted the Langmuir isothermal adsorption model and followed pseudo-second-order kinetic models, the activation energy of adsorption (Ea) was 10.78 kJ/mol, which indicated that the adsorption was single-molecule layer physical adsorption. The regeneration efficiency was still maintained at 84.20% after five adsorption-desorption cycles. The column adsorption experiments showed that the adsorption capacity of the Thomas model reached 13.69 mg/g and the semi-penetrating time of the Yoon-Nelson model was 205 min at 298 K. Fe3O4 was identified as the main adsorption site by adsorption energy calculation, XRD and XPS analysis. The FT-IR, Zeta potential, and ionic strength analysis indicated that the adsorption mechanism was hydrogen bonding interaction and electrostatic interaction. This work proved that steel slag could be utilized as a potential adsorbent for phenol-containing wastewater treatment.


Asunto(s)
Aguas del Alcantarillado , Contaminantes Químicos del Agua , Adsorción , Concentración de Iones de Hidrógeno , Cinética , Nitrofenoles , Espectroscopía Infrarroja por Transformada de Fourier , Acero/química , Contaminantes Químicos del Agua/química
4.
Arch Gynecol Obstet ; 306(3): 723-734, 2022 09.
Artículo en Inglés | MEDLINE | ID: mdl-34820720

RESUMEN

BACKGROUND: The study aimed to investigate the potential risk factors for the placenta accreta spectrum (PAS), determine the predictive value of a diagnostic model, and evaluate the effects of octamethylcyclotetrasiloxane (OMCTS) on trophoblast proliferation and migration. METHODS: This case-control study included 244 pregnant women with PAS and 327 normal pregnant women who visited Guangzhou Women and Children's Medical Centre, China, from January 2014 to December 2017. Blood was collected from 42 women with PAS and 77 controls, and plasma specimens were analyzed by gas chromatography-time-of-flight mass spectrometry. In addition, the proliferation and migration of trophoblast cells were examined after treatment with OMCTS. RESULTS: We found an association between the risk of PAS and clinical factors related to fasting blood glucose levels (BS0, OR = 5.78), as well as factors related to endometrial injury [history of cesarean section (OR = 179.59), uterine scarring (OR = 68.37), and history of abortion (OR = 5.66)]. Equally important, pregnant women with PAS had significantly higher plasma OMCTS concentrations than controls. In vitro, we found that OMCTS could promote the proliferation and migration of HTR8/SVneo cells. The model of combining clinical factors and OMCTS had a good performance in PAS prediction (AUC = 0.97, 95% CI 0.78-0.93). CONCLUSIONS: The early diagnosis of PAS in pregnant women requires assessing risk factors, metabolic status, and BS0 levels before 20 weeks of gestation. OMCTS may be related to the development of PAS by promoting trophoblast cell proliferation and migration.


Asunto(s)
Placenta Accreta , Placenta Previa , Estudios de Casos y Controles , Cesárea , Niño , Femenino , Humanos , Placenta , Placenta Accreta/terapia , Embarazo , Estudios Retrospectivos , Factores de Riesgo , Siloxanos
5.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi ; 39(5): 870-875, 2022 Oct 25.
Artículo en Zh | MEDLINE | ID: mdl-36310475

RESUMEN

During the automatic reconstruction of panoramic images, the effect of dental arch curve fitting will affect the integrity of the content of the panoramic image. Metal implants in the patient's mouth usually lead to a decrease in the contrast of the panoramic image, which affects the doctor's diagnosis. In this paper, an automatic oral panoramic image reconstruction method was proposed. By calculating key image areas and image extraction fusion algorithms, the dental arch curve could be automatically detected and adjusted on a small number of images, and the intensity distribution of teeth, bone tissue and metal implants on the image could be adjusted to reduce the impact of metal on other tissues, to generate high-quality panoramic images. The method was tested on 50 cases of cone beam computed tomography (CBCT) data with good results, which can effectively improve the quality of panoramic images.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Diente , Humanos , Radiografía Panorámica/métodos , Tomografía Computarizada de Haz Cónico/métodos , Algoritmos , Procesamiento de Imagen Asistido por Computador/métodos
6.
Int J Mol Sci ; 22(15)2021 Aug 03.
Artículo en Inglés | MEDLINE | ID: mdl-34361113

RESUMEN

Efficient and safe nanopesticides play an important role in pest control due to enhancing target efficiency and reducing undesirable side effects, which has become a hot spot in pesticide formulation research. However, the preparation methods of nanopesticides are facing critical challenges including low productivity, uneven particle size and batch differences. Here, we successfully developed a novel, versatile and tunable strategy for preparing buprofezin nanoparticles with tunable size via anodic aluminum oxide (AAO) template-assisted method, which exhibited better reproducibility and homogeneity comparing with the traditional method. The storage stability of nanoparticles at different temperatures was evaluated, and the release properties were also determined to evaluate the performance of nanoparticles. Moreover, the present method is further demonstrated to be easily applicable for insoluble drugs and be extended for the study of the physicochemical properties of drug particles with different sizes.


Asunto(s)
Óxido de Aluminio/química , Materiales Biocompatibles Revestidos/química , Insecticidas/química , Nanopartículas del Metal/química , Tiadiazinas/química , Electrodos , Ensayo de Materiales , Porosidad , Propiedades de Superficie
7.
Diabetes Obes Metab ; 22(12): 2375-2383, 2020 12.
Artículo en Inglés | MEDLINE | ID: mdl-32744358

RESUMEN

AIM: To assess the efficacy and safety of polyethylene glycol loxenatide (PEX168), a new glucagon-like peptide-1 receptor agonist, as an add-on to metformin therapy in Chinese patients with type 2 diabetes (T2D). MATERIALS AND METHODS: This was a multicentre, randomized, double-blind, placebo-controlled phase 3b trial. After metformin monotherapy (≥1500 mg/day) for 8 weeks or more, patients with uncontrolled T2D (HbA1c of 7.0%-10.5%) from 44 sites were randomized (1:1:1) to metformin + placebo, metformin + PEX168 100 µg, and metformin + PEX168 200 µg. The core treatment period lasted for 24 weeks, followed by a 28-week extension period. The primary endpoint was the change in HbA1c levels at week 24. The main secondary endpoint was the proportion of patients with an HbA1c of less than 7.0% at week 24. RESULTS: The least-square mean (standard error) change in HbA1c levels was significantly greater (P < .001 for superiority) in the PEX168 groups (-1.16% [0.08%] and -1.14% [0.08%] with 100 and 200 µg, respectively) than in the placebo group (0.35% [0.08%]). The proportion of patients with an HbA1c of less than 7.0% at week 24 was significantly higher in the PEX168 100 µg (37.4%) and PEX168 200 µg (40.6%) groups than in the placebo group (16.8%; both P < .001). The gastrointestinal reactions were mild; the risks of hypoglycaemia and weight gain did not increase. Anti-PEX168 antibodies were noted in less than 2% of patients. No treatment-emergent serious adverse events occurred. CONCLUSION: The subcutaneous injection of PEX168 once a week can effectively, continuously and safely improve HbA1c levels in patients with T2D when combined with metformin.


Asunto(s)
Diabetes Mellitus Tipo 2 , Metformina , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Método Doble Ciego , Quimioterapia Combinada , Hemoglobina Glucada/análisis , Humanos , Hipoglucemiantes/efectos adversos , Metformina/efectos adversos , Péptidos/uso terapéutico , Polietilenglicoles , Resultado del Tratamiento
8.
Small ; 15(16): e1900511, 2019 04.
Artículo en Inglés | MEDLINE | ID: mdl-30913375

RESUMEN

Transformable liquid metal (LM)-based materials have attracted considerable research interest in biomedicine. However, the potential biomedical applications of LMs have not yet been fully explored. Herein, for the first trial, the inductive heating property of gallium-indium eutectic alloy (EGaIn) under alterative magnetic field is systematically investigated. By virtue of its inherent metallic nature, LM possesses excellent magnetic heating property as compared to the conventional magnetite nanoparticles, therefore enabling its unique application as non-magnetic agents in magnetic hyperthermia. Moreover, the extremely high surface tension of LM could be dramatically lowered by a rather facile PEGylation approach, making LM an ideal carrier for other theranostic cargos. By incorporating doxorubicin (DOX)-loaded mesoporous silica (DOX-MS) within PEGylated LM, a magnetic field-driven transformable LM hybrid platform capable of pH/AFM dual stimuli-responsive drug release and magnetic thermochemotherapy are successfully fabricated. The potential application for breast cancer treatment is demonstrated. Furthermore, the large X-ray attenuation ability of LM endows the hybrid with the promising ability for CT imaging. This work explores a new biomedical use of LM and a promising cancer treatment protocol based on LM hybrid for magnetic hyperthermia combined with dual stimuli-responsive chemotherapy and CT imaging.


Asunto(s)
Doxorrubicina/administración & dosificación , Sistemas de Liberación de Medicamentos/métodos , Hipertermia Inducida/métodos , Campos Magnéticos , Nanomedicina Teranóstica/métodos , Animales , Materiales Biocompatibles , Liberación de Fármacos , Femenino , Humanos , Células MCF-7 , Magnetismo , Nanopartículas de Magnetita , Metales/química , Ratones , Dióxido de Silicio/química
9.
Orthod Craniofac Res ; 22 Suppl 1: 142-148, 2019 May.
Artículo en Inglés | MEDLINE | ID: mdl-31074137

RESUMEN

OBJECTIVES: To assess the effect of virtual surgical planning (VSP) on the accuracy of condylar seating in surgical cases involving Bilateral Sagittal Split Osteotomy (BSSO). An additional aim was to quantify differences between actual surgical outcome and planned virtual outcome. SETTING AND SAMPLE POPULATION: A private practice in Charlotte North Carolina. Twenty-five consecutively operated subjects prepared with VSP and twenty consecutively subjects operated with conventional surgery planning were enrolled. MATERIAL AND METHODS: Cone beam computed tomography (CBCT) scans were obtained before surgery (T1) and post-surgery after splint removal (T2). The T1 and T2 CBCTs were superimposed on the anterior cranial base using voxel-based registration. Three dimensional (3D) models were built and oriented to a 3D Frankfurt horizontal. Displacement of corresponding condylar landmarks was measured. RESULTS: No significant difference was found between the VSP and conventional group in the magnitude of translation or rotation of the condyles following surgery. VSP surgical outcomes differed significantly from predicted positions at all landmarks. Virtual surgical planning does not prevent changes to condylar position as a result of surgery. Actual surgical results differed significantly from VSP-predicted outcomes. CONCLUSIONS: Virtual surgical planning did not reduce the changes to condylar position and angulation that resulted from conventionally planned orthognathic surgery.


Asunto(s)
Cirugía Ortognática , Procedimientos Quirúrgicos Ortognáticos , Tomografía Computarizada de Haz Cónico , Imagenología Tridimensional , Cóndilo Mandibular
10.
J Labelled Comp Radiopharm ; 62(7): 301-309, 2019 06 15.
Artículo en Inglés | MEDLINE | ID: mdl-31032992

RESUMEN

A novel 131 I-radiolabeled probe with aromatic boronate motif (131 I-EIPBA) was designed to target progesterone receptor (PR)-positive breast cancer with enhanced nucleus uptake. Acetylene progesterone was conjugated with pegylated phenylboronic acid via click reaction and radiolabeled with 131 I to afford 131 I-EIPBA. Meanwhile, 131 I-EIPB without boronate was prepared as control agent. After determination of the lipophilicity and stability of these tracers, in vitro cell uptake studies and in vivo biodistribution in rats were performed to verify the enhanced nucleus uptake and PR targeting ability of 131 I-EIPBA. 131 I-EIPBA was obtained with moderate radiochemical yield (40.35 ± 3.52%) and high radiochemical purity (>98%). As expected, the high binding affinity (39.58 nM) of 131 I-EIPBA for PR was determined by cell binding assay. The internalization ratio of 131 I-EIPBA was remarkably higher than that of 131 I-EIPB in PR-positive MCF-7 cells. Furthermore, the enhanced nucleus uptake of 131 I-EIPBA (0.59 ± 0.02%) was found to be significantly higher than that of 131 I-EIPB (0.13 ± 0.01%) in MCF-7 cells. A novel 131 I-EIPBA compound was developed for PR targeting with improved cellular nucleus uptake. Furthermore, the introduction of aromatic boronate motif provides a worthwhile strategy for enhancing the nuclear receptor targeting of tracers.


Asunto(s)
Ácidos Borónicos/química , Núcleo Celular/metabolismo , Radioisótopos de Yodo/química , Progesterona/química , Progesterona/metabolismo , Receptores de Progesterona/metabolismo , Transporte Activo de Núcleo Celular , Animales , Femenino , Humanos , Interacciones Hidrofóbicas e Hidrofílicas , Marcaje Isotópico , Células MCF-7 , Polietilenglicoles/química , Progesterona/farmacocinética , Radioquímica , Ratas , Ratas Sprague-Dawley , Distribución Tisular
11.
Int J Mol Sci ; 20(1)2019 Jan 03.
Artículo en Inglés | MEDLINE | ID: mdl-30609831

RESUMEN

Plasma membrane intrinsic proteins (PIPs) are a subfamily of aquaporin proteins located on plasma membranes where they facilitate the transport of water and small uncharged solutes. PIPs play an important role throughout plant development, and in response to abiotic stresses. Jojoba (Simmondsia chinensis (Link) Schneider), as a typical desert plant, tolerates drought, salinity and nutrient-poor soils. In this study, a PIP1 gene (ScPIP1) was cloned from jojoba and overexpressed in Arabidopsis thaliana. The expression of ScPIP1 at the transcriptional level was induced by polyethylene glycol (PEG) treatment. ScPIP1 overexpressed Arabidopsis plants exhibited higher germination rates, longer roots and higher survival rates compared to the wild-type plants under drought and salt stresses. The results of malonaldehyde (MDA), ion leakage (IL) and proline content measurements indicated that the improved drought and salt tolerance conferred by ScPIP1 was correlated with decreased membrane damage and improved osmotic adjustment. We assume that ScPIP1 may be applied to genetic engineering to improve plant tolerance based on the resistance effect in transgenic Arabidopsis overexpressing ScPIP1.


Asunto(s)
Acuaporinas/metabolismo , Arabidopsis/metabolismo , Secuencia de Aminoácidos , Acuaporinas/clasificación , Acuaporinas/genética , Arabidopsis/genética , Sequías , Magnoliopsida/genética , Malondialdehído/metabolismo , Fenotipo , Filogenia , Hojas de la Planta/efectos de los fármacos , Hojas de la Planta/genética , Hojas de la Planta/metabolismo , Plantas Modificadas Genéticamente/genética , Plantas Modificadas Genéticamente/metabolismo , Polietilenglicoles/farmacología , Prolina/metabolismo , Tolerancia a la Sal , Alineación de Secuencia , Estrés Fisiológico
12.
Neurodegener Dis ; 18(2-3): 74-83, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-29587262

RESUMEN

BACKGROUND: Charcot-Marie-Tooth disease (CMT) is the most common neurodegenerative disorder of the peripheral nervous system. More than 50 genes/loci were found associated with the disease. We found a family with autosomal-dominant CMT2. OBJECTIVE: To reveal the pathogenic gene of the family and further investigate the function of the variant. METHODS: DNA underwent whole-genome linkage analysis for all family members and whole-exome sequencing for 2 affected members. Neurofilament light polypeptide and wild-type or mutant neurofilament heavy polypeptide (NEFH) were co-transfected into SW13 (vim-) cells. The nefh-knockdown zebrafish model was produced by using morpholino antisense oligonucleotides. RESULTS: We identified a novel insertion variant (c.3057insG) in NEFH in the family. The variant led to the loss of a stop codon and an extended 41 amino acids in the protein. Immunofluorescence results revealed that mutant NEFH disrupted the neurofilament network and induced aggregation of NEFH protein. Knockdown of nefh in zebrafish caused a slightly or severely curled tail. The motor ability of nefh-knockdown embryos was impaired or even absent, and the embryos showed developmental defects of axons in motor neurons. The abnormal phenotype and axonal developmental defects could be rescued by injection of human wild-type but not human mutant NEFH mRNA. CONCLUSIONS: We identified a novel stop loss variant in NEFH that is likely pathogenic for CMT2, and the results provide further evidence for the role of an aberrant assembly of neurofilament in CMT.


Asunto(s)
Enfermedad de Charcot-Marie-Tooth/genética , Exoma/genética , Estudio de Asociación del Genoma Completo , Filamentos Intermedios/genética , Mutación/genética , Animales , Axones/metabolismo , Femenino , Humanos , Filamentos Intermedios/metabolismo , Masculino , Neuronas Motoras/metabolismo , Proteínas de Neurofilamentos/genética , Linaje , Fenotipo , Pez Cebra
13.
Macromol Rapid Commun ; 38(9)2017 May.
Artículo en Inglés | MEDLINE | ID: mdl-28272767

RESUMEN

There is a significant cost to mitigate the infection and inflammation associated with the implantable medical devices. The development of effective antibacterial and anti-inflammatory biomaterials with novel mechanism of action has become an urgent task. In this study, a supramolecular polymer hydrogel is synthesized by the copolymerization of N-acryloyl glycinamide and 1-vinyl-1,2,4-triazole in the absence of any chemical crosslinker. The hydrogel network is crosslinked through the hydrogen bond interactions between dual amide motifs in the side chain of N-acryloyl glycinamide. The prepared hydrogels demonstrate excellent mechanical properties-high tensile strength (≈1.2 MPa), large stretchability (≈1300%), and outstanding compressive strength (≈11 MPa) at swelling equilibrium state. A simulation study elaborates the changes of hydrogen bond interactions when 1-vinyl-1,2,4-triazole is introduced into the gel network. It is demonstrated that the introduction of 1-vinyl-1,2,4-triazole endowes the supramolecular hydrogels with self-repairability, thermoplasticity, and reprocessability over a lower temperature range for 3D printing of different shapes and patterns under simplified thermomelting extrusion condition. In addition, these hydrogels exhibit antimicrobial and anti-inflammatory activities, and in vitro cytotoxicity assay and histological staining following in vivo implantation confirm the biocompatibility of the hydrogel. These hydrogels with integrated multifunctions hold promising potential as an injectable biomaterial for treating degenerated soft supporting tissues.


Asunto(s)
Bacterias/efectos de los fármacos , Hidrogel de Polietilenoglicol-Dimetacrilato/química , Hidrogel de Polietilenoglicol-Dimetacrilato/farmacología , Polímeros/química , Animales , Antibacterianos/farmacología , Antiinflamatorios/farmacología , Supervivencia Celular/efectos de los fármacos , Glicina/análogos & derivados , Glicina/química , Hidrogel de Polietilenoglicol-Dimetacrilato/síntesis química , Hidrogel de Polietilenoglicol-Dimetacrilato/toxicidad , Masculino , Ratones , Triazoles/química
14.
J Nanosci Nanotechnol ; 14(6): 4481-5, 2014 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-24738416

RESUMEN

The fluorescence enhancement effect of Rh6G molecules deposited on the silver film substrate decorated with nanohole arrays was investigated in this paper. The prepared substrate, decorated with nanohole arrays, was fabricated with the deposition of silver films onto the anodic aluminum oxide templates through magnetron sputtering method. Compared with the conventional continuous silver film substrate, the prepared substrate shows better enhanced effect. Particularly, the fluorescence enhancement factor has a relationship with the size and period of the nanohole arrays. The experimental observations were analyzed with local surface plasmon resonance model. The results of current work highlight the importance of strong electromagnetic coupling effect in surface enhanced fluorescence.


Asunto(s)
Membranas Artificiales , Nanopartículas del Metal/química , Nanopartículas del Metal/ultraestructura , Nanoporos/ultraestructura , Plata/química , Espectrometría de Fluorescencia/métodos , Resonancia por Plasmón de Superficie/métodos , Simulación por Computador , Luz , Ensayo de Materiales , Modelos Químicos , Dispersión de Radiación , Propiedades de Superficie
15.
Nano Lett ; 13(9): 4511-6, 2013 Sep 11.
Artículo en Inglés | MEDLINE | ID: mdl-23944904

RESUMEN

The physical and chemical behaviors of materials used in energy storage devices, such as lithium-ion batteries (LIBs), are mainly controlled by an electrochemical process, which normally involves insertion/extraction of ions into/from a host lattice with a concurrent flow of electrons to compensate charge balance. The fundamental physics and chemistry governing the behavior of materials in response to the ions insertion/extraction is not known. Herein, a combination of in situ lithiation experiments and large-scale ab initio molecular dynamics simulations are performed to explore the mechanisms of the electrochemically driven solid-state amorphization in Li-Si systems. We find that local electron-rich condition governs the electrochemically driven solid-state amorphization of Li-Si alloys. This discovery provides the fundamental explanation of why lithium insertion in semiconductor and insulators leads to amorphization, whereas in metals, it leads to a crystalline alloy. The present work correlates electrochemically driven reactions with ion insertion, electron transfer, lattice stability, and phase equilibrium.


Asunto(s)
Suministros de Energía Eléctrica , Litio/química , Silicio/química , Aleaciones , Electrones , Iones , Nanoestructuras/química , Transición de Fase
16.
Water Res ; 257: 121714, 2024 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-38723357

RESUMEN

Membrane breakage can lead to filtration failure, which allows harmful substances to enter the effluent, posing potential hazards to human health and the environment. This study is an innovative combination of fluorescence and ultraviolet-visible (UV-Vis) spectroscopy to identify membrane breakage. It aims to unravel more comprehensive information, improve detection sensitivity and selectivity, and enable real-time monitoring capabilities. Fluorescence and UV-Vis data are extracted through variance partitioning analysis (VPA) and integrated through a decision tree algorithm to form a superior system with enhanced discrimination capabilities. VPA improves discrimination efficiency by extracting key information from spectral data and eliminating redundancy. The decision tree algorithm, on the other hand, can process large amounts of data simultaneously. In addition, the method has a wide range of applications and can be used in various scenarios accurately. The scenarios include domestic sewage, micropollutant water, aquaculture wastewater, and secondary treated sewage. The experimental results validate the application of machine learning classifiers in membrane breakage detection with an accuracy rate of 96.8 % to 97.4 %.


Asunto(s)
Aprendizaje Automático , Membranas Artificiales , Filtración , Espectrometría de Fluorescencia , Aguas Residuales , Aguas del Alcantarillado , Algoritmos , Espectrofotometría Ultravioleta , Contaminantes Químicos del Agua/análisis
17.
Pharmacol Res ; 70(1): 102-15, 2013 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-23376353

RESUMEN

In this paper we give a method of integrated treatment for cancer and drug-induced complications in the process of cancer therapy through dual-drug delivery system (DDDS). Two hydrophilic drugs, doxorubicin (an antitumor drug) and verapamil (an antiangiocardiopathy drug) combined preliminarily with chitosan shell coated on magnetic nanoparticles (MNPs), followed by entrapping into the PLGA nanoparticles. Further modification was conducted by conjugating tumor-targeting ligand, cyclo(Arg-Gly-Asp-D-Phe-Lys) (c(RGDfK)) peptide, onto the end carboxyl groups on the PLGA-NPs. The size of the resulting cRGD-DOX/VER-MNP-PLGA NPs was approximately 144nm under simulate physiological environment. Under present experiment condition, the entrapment efficiencies of DOX and VER were approximately 74.8 and 53.2wt% for cRGD-DOX/VER-MNP-PLGA NPs. This paper contains interesting pilot data such as NIR-triggered drug release, in vivo drug distribution studies and whole-mouse optical imaging. Histopathological examinations and electrocardiogram comparison demonstrated that the intelligent DDDS could markedly inhibit the growth of tumor and potentially offer an approach for safe cancer therapy.


Asunto(s)
Inhibidores de la Angiogénesis/administración & dosificación , Antiarrítmicos/administración & dosificación , Doxorrubicina/administración & dosificación , Portadores de Fármacos/química , Nanopartículas de Magnetita/química , Péptidos Cíclicos/administración & dosificación , Verapamilo/administración & dosificación , Inhibidores de la Angiogénesis/farmacocinética , Inhibidores de la Angiogénesis/uso terapéutico , Animales , Antiarrítmicos/farmacocinética , Antiarrítmicos/uso terapéutico , Supervivencia Celular/efectos de los fármacos , Doxorrubicina/farmacocinética , Doxorrubicina/uso terapéutico , Combinación de Medicamentos , Sistemas de Liberación de Medicamentos/métodos , Electrocardiografía , Células Hep G2 , Humanos , Ácido Láctico/química , Masculino , Ratones , Ratones Endogámicos BALB C , Tamaño de la Partícula , Péptidos Cíclicos/farmacocinética , Péptidos Cíclicos/uso terapéutico , Proyectos Piloto , Ácido Poliglicólico/química , Copolímero de Ácido Poliláctico-Ácido Poliglicólico , Sarcoma Experimental/tratamiento farmacológico , Sarcoma Experimental/metabolismo , Sarcoma Experimental/patología , Solubilidad , Propiedades de Superficie , Distribución Tisular , Verapamilo/farmacocinética , Verapamilo/uso terapéutico
18.
Nanoscale ; 15(24): 10412-10422, 2023 Jun 23.
Artículo en Inglés | MEDLINE | ID: mdl-37305976

RESUMEN

Aligned carbon nanotube (CNT) arrays have been widely used in the preparation of polymer composites. CNT arrays are commonly prepared by chemical vapor deposition (CVD) in a high temperature tubular furnace, and the areas of the aligned CNT/polymer membranes prepared are relatively small (<30 cm2) due to the limitation of the inner diameter of the furnace, which limits its practical application in the field of membrane separation. Herein, the vertically aligned CNT arrays/polydimethylsiloxane (PDMS) membrane with large and expandable area was prepared by a modular splicing method for the first time, with a maximum area of 144 cm2. The addition of CNT arrays with openings at both ends significantly improved the pervaporation performance of the PDMS membrane for ethanol recovery. At 80 °C, the flux (671.6 g m-2 h-1) and separation factor (9.0) of CNT arrays/PDMS membrane were increased by 435.12% and 58.52%, respectively, compared with those of the PDMS membrane. Furthermore, the expandable area enabled the CNT arrays/PDMS membrane to couple with fed-batch fermentation for pervaporation for the first time, which increased the ethanol yield (0.47 g g-1) and productivity (2.34 g L-1 h-1) by 9.3% and 4.9% respectively compared with batch fermentation. Besides, the flux (135.47-166.79 g m-2 h-1) and separation factor (8.83-9.21) of CNT arrays/PDMS membrane remained stable in this process, indicating that this membrane has the potential to be applied in industrial bioethanol production. This work provides a new idea for the preparation of large-area aligned CNT/polymer membranes, and also opens up a new direction for the application of large-area aligned CNT/polymer membranes.


Asunto(s)
Nanotubos de Carbono , Etanol , Fermentación , Membranas Artificiales , Dimetilpolisiloxanos , Polímeros
19.
J Dig Dis ; 24(4): 305-310, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-37300524

RESUMEN

OBJECTIVES: Exposed endoscopic full-thickness resection (Eo-EFTR) has proven effective and economical for patients with gastric submucosal tumors (SMTs), showing great prospects. However, the poor operative field of view, the risk of tumors falling into the peritoneal cavity, especially the difficulties in defect closure, have limited its widespread application. Herein, we described a modified traction-assisted Eo-EFTR technique aimed at simplifying both the dissection and defect closure procedures. METHODS: Nineteen patients who underwent the modified Eo-EFTR for gastric SMTs in the Chinese People's Liberation Army General Hospital were enrolled in the study. Following a 2/3 circumferential full-thickness incision, a clip with dental floss was anchored to the resected part of the tumor surface. With the dental floss traction, the gastric defect was reshaped into a V shape, which facilitated the deployment of clips to close the defect. The defect closure and tumor dissection procedures were then performed alternately. Patients' demographics, tumor characteristics, and therapeutic outcomes were evaluated retrospectively. RESULTS: All tumors had an R0 resection. The median procedure time was 43 min (range 28-89 min). No severe perioperative adverse events occurred. Two patients experienced transient fever, and three patients complained of mild abdominal pain on the first day after the operation. All patients recovered on the next day with conservative management. No residual lesion or recurrence was reported during the follow-up period of 30.1 months. CONCLUSION: The safety and practicability of the modified technique might allow for wide clinical applications of Eo-EFTR in gastric SMTs.


Asunto(s)
Resección Endoscópica de la Mucosa , Neoplasias Gástricas , Humanos , Resultado del Tratamiento , Tracción , Estudios Retrospectivos , Neoplasias Gástricas/patología , Resección Endoscópica de la Mucosa/efectos adversos , Resección Endoscópica de la Mucosa/métodos , Gastroscopía/efectos adversos , Gastroscopía/métodos
20.
Int J Nanomedicine ; 18: 4485-4505, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37576462

RESUMEN

Pluronic F127 hydrogel biomaterial has garnered considerable attention in wound healing and repair due to its remarkable properties including temperature sensitivity, injectability, biodegradability, and maintain a moist wound environment. This comprehensive review provides an in-depth exploration of the recent advancements in Pluronic F127-derived hydrogels, such as F127-CHO, F127-NH2, and F127-DA, focusing on their applications in the treatment of various types of wounds, ranging from burns and acute wounds to infected wounds, diabetic wounds, cutaneous tumor wounds, and uterine scars. Furthermore, the review meticulously examines the intricate interaction mechanisms employed by these hydrogels within the wound microenvironment. By elucidating the underlying mechanisms, discussing the strengths and weaknesses of Pluronic F127, analyzing the current state of wound healing development, and expanding on the trend of targeting mitochondria and cells with F127 as a nanomaterial. The review enhances our understanding of the therapeutic effects of these hydrogels aims to foster the development of effective and safe wound-healing modalities. The valuable insights provided this review have the potential to inspire novel ideas for clinical treatment and facilitate the advancement of innovative wound management approaches.


Asunto(s)
Poloxámero , Cicatrización de Heridas , Polietilenos/farmacología , Hidrogeles/farmacología
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