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1.
Am J Geriatr Psychiatry ; 32(8): 909-919, 2024 08.
Artigo em Inglês | MEDLINE | ID: mdl-38443298

RESUMO

OBJECTIVES: We examined relationships between apathy (self and study-partner-reported) and markers of Alzheimer's disease (AD) in older adults. DESIGN: The study utilized a well-characterized sample of participants from the Harvard Aging Brain Study (HABS), a longitudinal cohort study. Participants were cognitively unimpaired without clinically significant neuropsychiatric symptoms at HABS baseline. The dependent variables, apathy evaluation scale-self (AES-S) and informant (AES-I), were administered cross-sectionally between years 6-9 and compared to the independent variables, amyloid and tau PET neuroimaging, from the same year. SETTING: Community-dwelling participants assessed at research visits in an academic medical center. PARTICIPANTS: Participants (n = 170) completed assessments within 1.5 years of their neuroimaging visit. At the time of apathy assessment, N = 156 were cognitively unimpaired and 14 had progressed to mild cognitive impairment (n = 8) or dementia (n = 6). MEASUREMENTS: We utilized linear regression models to assess cross-sectional associations of AES-S and AES-I with AD PET imaging measures (beta-amyloid (Pittsburgh Compound B) and tau (Flortaucipir)), covarying for age, sex, education, and the time between PET scan-apathy assessment. RESULTS: AES-I was significantly associated with beta-amyloid and temporal lobe tau, and the associations were retained after further adjusting for depressive symptoms. The associations between AES-S and AD biomarkers were not significant. In an exploratory subgroup analysis of cognitively unimpaired individuals with elevated Aß, we observed an association between AES-I and inferior temporal tau. CONCLUSIONS: Study-partner-reported, but not self-reported, apathy in older adults is associated with AD pathology, and we observed this relationship starting from the preclinical stage. Our findings highlight the importance of collateral information in capturing AD-related apathy.


Assuntos
Envelhecimento , Doença de Alzheimer , Apatia , Biomarcadores , Tomografia por Emissão de Pósitrons , Proteínas tau , Humanos , Apatia/fisiologia , Masculino , Feminino , Doença de Alzheimer/diagnóstico por imagem , Doença de Alzheimer/metabolismo , Idoso , Biomarcadores/metabolismo , Estudos Longitudinais , Proteínas tau/metabolismo , Idoso de 80 Anos ou mais , Envelhecimento/metabolismo , Envelhecimento/psicologia , Estudos Transversais , Encéfalo/diagnóstico por imagem , Encéfalo/metabolismo , Peptídeos beta-Amiloides/metabolismo , Disfunção Cognitiva/diagnóstico por imagem , Disfunção Cognitiva/metabolismo , Autorrelato
2.
BMC Vet Res ; 20(1): 103, 2024 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-38491518

RESUMO

BACKGROUND: Salmonella enterica subspecies enterica serovar abortus equi (S. abortus equi) is one of the main pathogens that causes abortion in pregnant horses and donkeys, which was highly infectious and greatly restricts the healthy development of the horse industry. OBJECTIVES: In order to investigate the prevalence and biological characteristics of S. abortus equi in different regions and breeds of horses in Xinjiang. METHODS: This study conducted ELISA detection of S. abortus equi antibodies on serum samples of 971 horses collected from three large-scale horse farms and five free-range horse farms in Yili Prefecture and Bayingol Mongolian Autonomous Prefecture of Xinjiang from 2020 to 2023. On this basis, bacterial isolation, culture, identification, and drug sensitivity tests were conducted on 42 samples of aborted foal tissues and 23 mare vaginal swabs. RESULTS: The results showed that the positive rate of S. abortus equi antibody was as high as 20.91% in 971 horse serum samples. Among them, the positive rate in the Ili region (29.09%) was significantly higher than that in the Bayingole region (11.24%), and the positive rate in mares (22.45%) was higher than that in stallions (14.05%). In terms of horse breeds, the positive rates of self-propagating thoroughbred horses, half-bred horses, Ili horses and Yanqi horses were 43.22%, 28.81%, 14.72% and 11.24% respectively. In addition, S. abortus equi was more susceptible to juvenile and elderly horses, with positive rates of 70.00%and 41.86%, respectively, both of which were significantly higher than young (10.97%) and adult (19.79%) horses. Further, 9 strains of S. abortus equi were obtained through bacterial isolation, culture and identification, which were resistant to five antibiotics (Clarithromycin, Clindamycin, penicillin, Sulfamethoxazole and Rifampicin), and sensitive to 13 antimicrobial agents (Amoxicillin, Ciprofloxacin and Gentamicin, et al.). CONCLUSION: There was a high infection rate of S. abortus equi in Ili Prefecture and self-propagating thoroughbred horses, and juvenile or old mares were more susceptible, which will provide scientific basis for the prevention of S. abortus equi infection in different regions and breeds of horses in Xinjiang.


Assuntos
Aborto Animal , Doenças dos Cavalos , Gravidez , Cavalos , Animais , Feminino , Masculino , Aborto Animal/epidemiologia , Equidae , Ensaio de Imunoadsorção Enzimática/veterinária , Salmonella , Doenças dos Cavalos/epidemiologia , Doenças dos Cavalos/microbiologia
3.
Biomed Chromatogr ; 38(5): e5840, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38402901

RESUMO

The incidence of colibacillosis in poultry is on the rise, significantly affecting the chicken industry. Ceftiofur sodium (CS) is frequently employed to treat this disease, resulting in lipopolysaccharide (LPS) buildup. Processing plays a vital role in traditional Chinese veterinary medicine. The potential intervention in liver injury by polysaccharides from the differently processed products of Angelica sinensis (PDPPAS) induced by combined CS and LPS remains unclear. This study aims to investigate the protective effect of PDPPAS on chicken liver injury caused by CS combined with LPS buildup and further identify the polysaccharides with the highest hepatoprotective activity in chickens. Furthermore, the study elucidates polysaccharides' intervention mechanism using tandem mass tag (TMT) proteomics and multiple reaction monitoring (MRM) methods. A total of 190 1-day-old layer chickens were randomly assigned into 12 groups, of which 14 chickens were in the control group and 16 in other groups, for a 10-day trial. The screening results showed that charred A. sinensis polysaccharide (CASP) had the most effective and the best hepatoprotective effect at 48 h. TMT proteomics and MRM validation results demonstrated that the intervention mechanism of the CASP high-dose (CASPH) intervention group was closely related to the protein expressions of FCER2, TBXAS1, CD34, AGXT, GCAT, COX7A2L, and CYP2AC1. Conclusively, the intervention mechanism of CASPH had multitarget, multicenter regulatory features.


Assuntos
Angelica sinensis , Galinhas , Fígado , Polissacarídeos , Proteômica , Espectrometria de Massas em Tandem , Animais , Angelica sinensis/química , Proteômica/métodos , Polissacarídeos/farmacologia , Polissacarídeos/química , Polissacarídeos/análise , Espectrometria de Massas em Tandem/métodos , Fígado/efeitos dos fármacos , Fígado/metabolismo , Proteoma/análise , Proteoma/efeitos dos fármacos , Medicamentos de Ervas Chinesas/farmacologia , Medicamentos de Ervas Chinesas/química , Doença Hepática Induzida por Substâncias e Drogas/prevenção & controle
4.
Arch Gynecol Obstet ; 2024 Aug 14.
Artigo em Inglês | MEDLINE | ID: mdl-39143334

RESUMO

PURPOSE: To explore the effectiveness of sling surgery followed by pelvic floor muscle exercises (PFME) or PFME alone for moderate stress urinary incontinence (SUI) in women and its influencing factors. METHODS: This is a prospective observational cohort study investigating whether sling surgery or PFME is preferred for pre-menopause women with moderate uncomplicated SUI. Those who received PFME alone or sling surgery were divided to PT or TVT group, respectively. The primary outcome was objective cure at 12 months. The secondary outcomes included Incontinence Impact Questionnaire-Short Form (IIQ-7) scores and PFME adherence. RESULTS: The study sample comprised 130 and 74 patients in the PT and TVT groups, respectively. There was 38.2% of patients adhered to PFME twice weekly or more often, and the compliance varied by education level. At 12 months, the objective cure rate was significantly higher in the TVT versus PT group (75.7% vs 47.7%; adjusted OR = 4.27; 95% CI, 2.05-8.87; P < 0.001). In addition, the mean reduction in IIQ-7 scores was greater in the TVT group (16.2 vs 10.0; adjusted OR = 3.38; 95% CI, 1.93-4.82; P < 0.001). However, among patients with lower education or those without adherence to PFME at 12 months, the TVT was also favorized, and the discrepancy in cure rates was greater between the two groups. CONCLUSION: Sling procedures followed by PFME demonstrate greater efficacy versus physiotherapy alone for moderate female SUI management. Continued adherence to PFME was important, even for patients undergoing sling procedures. Educational factors influenced patient PFME adherence and the advantage conferred by sling procedures.

5.
Biomed Chromatogr ; 36(2): e5252, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-34591996

RESUMO

Angelica sinensis (AS) is a common Traditional Chinese Medicine used for tonifying blood in China. Unprocessed AS and its four kinds of processed products (ASs) are used to treat blood deficiency syndrome in the country. The different blood-tonifying mechanisms of ASs remain unclear. In this work, a novel method integrating metabolomics and hematological and biochemical parameters was established to provide a complementary explanation of blood supplementation mechanism of ASs. Our results revealed that different ASs exhibited various blood supplementation effect, and that AS parched with alcohol demonstrated the best blood supplementation effect. Eight metabolites from liver tissue and 12 metabolites from spleen tissue were considered to be potential biomarkers. These biomarkers were involved in four metabolic pathways. Correlation analysis results showed that l-aspartic acid and l-alanine (spleen tissue), linoleic acid, and l-cystathionine (liver tissue) exhibited a high positive or negative correlation with the aforesaid biochemical indicators. The blood-supplementation effect mechanism of ASs were related to four metabolic pathways. l-Aspartic acid and l-alanine (spleen tissue), linoleic acid, and l-cystathionine (liver tissue) were the four key metabolites associated with the blood supplementation effect of ASs. This study gives a complementary explanation of the blood supplementation effect and mechanism of action of ASs.


Assuntos
Angelica sinensis/química , Medicamentos de Ervas Chinesas/farmacologia , Medicina Tradicional Chinesa , Metaboloma/efeitos dos fármacos , Aminoácidos/metabolismo , Animais , Cromatografia Gasosa-Espectrometria de Massas , Ácido Linoleico/metabolismo , Fígado/efeitos dos fármacos , Fígado/metabolismo , Masculino , Metabolômica/métodos , Camundongos , Baço/efeitos dos fármacos , Baço/metabolismo
6.
Zhongguo Zhong Yao Za Zhi ; 47(14): 3887-3897, 2022 Jul.
Artigo em Zh | MEDLINE | ID: mdl-35850847

RESUMO

Baitouweng Decoction is a famous Chinese medicinal decoction that has been used to treat diarrhea over thousands of years. In this study, we investigated the effect and mechanism of Baitouweng Decoction in the treatment of diarrhea. Wistar rats were randomly assigned into 4 groups: control group, dampness-heat diarrhea model group(modeling by complex factors including high-sugar and high-fat diet, improper diet, hot and humid environment, drinking and intraperitoneal injection of Escherichia coli), Baitouweng Decoction(3.6 g·kg~(-1)) group, and self-healing group. A urine metabolomics approach was developed with ultra liquid chromatography-quadrupole-time-of-flight-mass spectrometry(UPLC-Q-TOF-MS) for metabolic profiling. The differential metabolites were screened out by the multivariate comparison between groups. Diarrhea-related protein targets and the active compounds of Baitouweng Decoction were used to predict the protein targets of Baitouweng Decoction. Cytoscape 3.2.1 was employed to establish a active component-target protein interaction network. Three protein-protein interaction(PPI) networks of component target proteins, diarrhea-related proteins, and differential metabolite-related proteins were established and then merged by BisoGenet. ClueGO was used to perform the gene enrichment based on the genetic similarity. The results showed that Baitouweng Decoction effectively treated dampness-heat diarrhea in vivo. N-acetylserotonin, L-gamma-glutamylcysteine, glutathione, retinoate, melatonin, indole-3-acetaldehyde, L-cystine, biotin, and L-tryptophan were screened as differential metabolites in dampness-heat diarrhea model group. Tryptophan metabolism, glutathione metabolism, biotin metabolism, retinol metabolism, and cysteine and methionine metabolism were involved in the therapeutic effect of Baitouweng Decoction in vivo. A total of 167 targets were identified as major candidates for diarrhea progression. The gene-set enrichment revealed that the targets were involved in reactive oxygen species production, inflammation, and apoptosis. Baitouweng Decoction can restrain inflammation, production of reactive oxygen, and block apoptosis, thereby contributing to the treatment of dampness-heat diarrhea.


Assuntos
Medicamentos de Ervas Chinesas , Metaboloma , Animais , Biotina , Diarreia/tratamento farmacológico , Medicamentos de Ervas Chinesas/farmacologia , Medicamentos de Ervas Chinesas/uso terapêutico , Glutationa , Temperatura Alta , Inflamação/tratamento farmacológico , Metabolômica/métodos , Farmacologia em Rede , Ratos , Ratos Wistar
7.
Angew Chem Int Ed Engl ; 60(2): 990-997, 2021 Jan 11.
Artigo em Inglês | MEDLINE | ID: mdl-32969140

RESUMO

Zinc ion hybrid capacitors (ZIHCs) are promising energy storage devices for emerging flexible electronics, but they still suffer from trade-off in energy density and cycling life. Herein, we show that such a dilemma can be well-addressed by deploying ZnCl2 based electrolytes. Combining experimental studies and density functional theory (DFT) calculations, for the first time, we demonstrate an intriguing chloride ion (Cl- ) facilitated desolvation mechanism in hydrated [ZnCl]+ (H2 O)n-1 (with n=1-6) clusters. Based on this mechanism, a water-in-salt type hydrogel electrolyte filled with ZnCl2 was developed to concurrently improve the energy storage capacity of porous carbon materials and the reversibility of Zn metal electrode. The resulting ZIHCs deliver a battery-level energy density up to 217 Wh kg-1 at a power density of 450 W kg-1 , an unprecedented cycling life of 100 000 cycles, together with excellent low-temperature adaptability and mechanical flexibility.

8.
J Am Chem Soc ; 142(52): 21861-21871, 2020 12 30.
Artigo em Inglês | MEDLINE | ID: mdl-33332110

RESUMO

Metal-nitrogen-carbon (M-N-C) single-atom catalysts (SACs) show high catalytic activity for many important chemical reactions. However, an understanding of their intrinsic catalytic activity remains ambiguous because of the lack of well-defined atomic structure control in current M-N-C SACs. Here, we use covalent organic framework SACs with an identical metal coordination environment as model catalysts to elucidate the intrinsic catalytic activity of various metal centers in M-N-C SACs. A pH-universal activity trend is discovered among six 3d transition metals for hydrogen peroxide (H2O2) synthesis, with Co having the highest catalytic activity. Using density functional calculations to access a total of 18 metal species, we demonstrate that the difference in the binding energy of O2* and HOOH* intermediates (EO2* - EHOOH*) on single metal centers is a reliable thermodynamic descriptor to predict the catalytic activity of the metal centers. The predicted high activity of Ir centers from the descriptor is further validated experimentally. This work suggests a class of structurally defined model catalysts and clear mechanistic principles for metal centers of M-N-C SACs in H2O2 synthesis, which may be further extendable to other reactions.

9.
Small ; 16(50): e2003400, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-33217172

RESUMO

2D materials have shown high potentials for fabricating next-generation membranes. To date, extensive studies have focused on the applications of 2D material membranes in gas and aqueous media. Recently, compelling opportunities emerge for 2D material membranes in separation applications in organic solvents because of their unique properties, such as ultrathin mono- to few-layers, outstanding chemical resistance toward organic solvents. Hence, this review aims to provide a timely overview of the current state-of-the-art of 2D material membranes focusing on their applications in organic solvent separations. 2D material membranes fabricated using graphene materials and a few representative nongraphene-based 2D materials, including covalent organic frameworks and MXenes, are summarized. The key membrane design strategies and their effects on separation performances in organic solvents are also examined. Last, several perspectives are provided in terms of the critical challenges for 2D material membranes, including standardization of membrane performance evaluation, improving understandings of separation mechanisms, managing the trade-off of permeability and selectivity, issues related to application versatility, long-term stability, and fabrication scalability. This review will provide a useful guide for researchers in creating novel 2D material membranes for advancing new separation techniques in organic solvents.

10.
Small ; 16(17): e1905885, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32243082

RESUMO

Developing highly efficient earth-abundant nickel-based compounds is an important step to realize hydrogen generation from water. Herein, the electronic modulation of the semiconducting NiS2 by cation doping for advanced water electrolysis is reported. Both theoretical calculations and temperature-dependent resistivity measurements indicate the semiconductor-to-conductor transition of NiS2 after Cu incorporation. Further calculations also suggest the advantages of Cu dopant to cathodic water electrolysis by bringing Gibbs free energy of H adsorption at both Ni sites and S sites much closer to zero. It is noteworthy that water dissociation on Cu-doped NiS2 (Cu-NiS2 ) surface is even more favorable than those on NiS2 and Pt(111). Thus, the prepared Cu-NiS2 shows noticeably improved performance toward alkaline hydrogen and oxygen evolution reactions (HER and OER). Specifically, it requires merely 232 mV OER overpotential to drive 10 mA cm-2 ; in parallel with Tafel slopes of 46 mV dec-1 . Regarding HER, an onset overpotential of only 68 mV is achieved. When integrated as both electrodes for water electrolysis, Cu-NiS2 needs only 1.64 V to drive 10 mA cm-2 , surpassing the state-of-the-art Ir/C-Pt/C couple (1.71 V). This work opens up an avenue to engineer low-cost and earth-abundant catalysts performing on par with the noble-metal-based one for water splitting.

11.
Nanotechnology ; 31(26): 265603, 2020 Apr 09.
Artigo em Inglês | MEDLINE | ID: mdl-32106102

RESUMO

Single-walled carbon nanotubes (SWCNTs) are potential antibacterial material, and their antibacterial activity in aqueous solutions depends on efficient surfactants to create strong interactions between well-dispersed SWCNTs and bacterial cells. Here, we designed and synthesized a new family of cationic surfactants by introducing different positively charged hydrophilic heads, i.e. -(CH2)6N+(CH3)3Br-, -(CH2)2N+(CH3)3Br- and -(CH2)2N+PyridineBr-, to cardanol obtained from cashew nut shell liquid. These surfactants can efficiently disperse SWCNTs in aqueous solutions because benzene rings and olefin chains in cardanol enable their strong π-stacking on SWCNTs. A much higher fraction of SWCNTs can be dispersed individually compared to the commonly used surfactant, dodecylbenzene-sulfonate sodium (SDBS). SWCNTs dispersed in the cardanol-derived surfactants demonstrate significantly improved antibacterial activity. At the concentration of 0.5 wt%, their minimum inhibitory concentration is 0.33 and 0.02 µg ml-1 against E. coli and S. aureus, respectively, which is only 0.8%-1.5% of that of SDBS-dispersed SWCNTs. The strong antibacterial activity can be attributed to both better dispersion of SWCNTs and positive charges introduced by hydrophilic heads, which are attracted to negatively charged bacterial cell surfaces. These cardanol-derived surfactants are promising as sustainable surfactants for enabling various SWCNT applications.


Assuntos
Antibacterianos/farmacologia , Fenóis/química , Tensoativos/química , Antibacterianos/química , Benzenossulfonatos/química , Escherichia coli/efeitos dos fármacos , Testes de Sensibilidade Microbiana , Nanotubos de Carbono/química , Staphylococcus aureus/efeitos dos fármacos
12.
Pharm Biol ; 58(1): 1167-1176, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33222580

RESUMO

CONTEXT: Angelica sinensis (Oliv.) Diels (Apiaceae) (syn. Angelica polymorpha Maxim var. sinensis Oliver) processed with yellow rice wine (WAS) has a blood-supplementing effect. OBJECTIVE: To establish an optimal technology for preparing water decoction of WAS (WASD), and screen blood-supplementing fractions. MATERIALS AND METHODS: Ferulic acid and crude polysaccharide were used in optimizing the preparation technology for WASD through response surface methodology. The independent variables were liquid-solid ratio, soaking time, and extraction time. Eighty Kunming mice were randomly divided into normal control, model, and six intervention groups (n = 10). The intervention groups were given different WASD fractions by gavage (5 or 10 g/kg). The model intervention groups received acetylphenyl hydrazine (subcutaneous injection) and cyclophosphamide (intraperitoneal injection). Duration of study, 9 days. The components of blood-supplementing fractions were analyzed. RESULTS: The optimum extraction parameters were liquid-solid ratio, 7.69:1 mL/g; soaking time, 119.78 min; and extraction time, 143.35 min. The optimal OD value was 0.8437. RBC, WBC, and Hb in the water fraction (5, 10 g/kg) and n-butanol fraction (10 g/kg) intervention groups increased significantly compared with the model group (p < 0.05). Polysaccharide and caffeic acid contents of water fraction were 252.565 and 0.346 µg/mg, respectively; ferulic acid was not detected. Caffeic acid and ferulic acid contents of n-butanol fraction were 1.187 and 0.806 µg/mg, respectively, polysaccharide was not detected. CONCLUSIONS: The optimum preparation technology of WASD was obtained, and the water, n-butanol fractions were blood-supplementing fractions. This study provides a theoretical foundation for further application of WAS in the pharmaceutical industry.


Assuntos
Angelica sinensis/química , Sangue/efeitos dos fármacos , Oryza/química , Extratos Vegetais/farmacologia , Animais , Contagem de Células Sanguíneas , Ácidos Cafeicos/química , Ácidos Cafeicos/farmacologia , Cromatografia Líquida de Alta Pressão , Ácidos Cumáricos/química , Ácidos Cumáricos/farmacologia , Medicina Tradicional Chinesa , Camundongos , Raízes de Plantas/química , Polissacarídeos/química , Polissacarídeos/farmacologia , Solventes , Espectrofotometria Ultravioleta , Timo/efeitos dos fármacos , Água , Vinho
13.
Angew Chem Int Ed Engl ; 59(12): 4793-4799, 2020 Mar 16.
Artigo em Inglês | MEDLINE | ID: mdl-31916361

RESUMO

Flexible zinc-air batteries (ZAB) are a promising battery candidate for emerging flexible electronic devices, but the catalysis-based working principle and unique semi-opened structure pose a severe challenge to their overall performance at cold temperature. Herein, we report the first flexible rechargeable ZAB with excellent low-temperature adaptability, based on the innovation of an efficient electrocatalyst to offset the electrochemical performance shrinkage caused by decreased temperature and a highly conductive hydrogel with a polarized terminal group to render the anti-freezing property. The fabricated ZABs show excellent electrochemical performances that outperform those of many aqueous ZABs at room temperature. They also deliver a high capacity of 691 mAh g-1 and an energy density of 798 Wh kg-1 at -20 °C (92.7 % and 87.2 % retention of the room temperature counterparts, respectively), together with excellent flexibility and reverting capability.

14.
Small ; 15(47): e1903817, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-31609075

RESUMO

Emerging wearable electronics require flexible energy storage devices with high volumetric energy and power densities. Fiber-shaped capacitors (FCs) offer high power densities and excellent flexibility but low energy densities. Zn-ion capacitors have high energy density and other advantages, such as low cost, nontoxicity, reversible Faradaic reaction, and broad operating voltage windows. However, Zn-ion capacitors have not been applied in wearable electronics due to the use of liquid electrolytes. Here, the first quasisolid-state Zn-ion hybrid FC (ZnFC) based on three rationally designed components is demonstrated. First, hydrothermally assembled high surface area and conductive reduced graphene oxide/carbon nanotube composite fibers serve as capacitor-type positive electrodes. Second, graphite fibers coated with a uniform Zn layer work as battery-type negative electrodes. Third, a new neutral ZnSO4 -filled polyacrylic acid hydrogel act as the quasisolid-state electrolyte, which offers high ionic conductivity and excellent stretchability. The assembled ZnFC delivers a high energy density of 48.5 mWh cm-3 at a power density of 179.9 mW cm-3 . Further, Zn dendrite formation that commonly happens under high current density is efficiently suppressed on the fiber electrode, leading to superior cycling stability. Multiple ZnFCs are integrated as flexible energy storage units to power wearable devices under different deformation conditions.


Assuntos
Capacitância Elétrica , Fontes de Energia Elétrica , Dispositivos Eletrônicos Vestíveis , Zinco/química , Resinas Acrílicas/química , Eletroquímica , Eletrodos , Eletrólitos/química , Grafite/química , Hidrogéis/química , Íons , Nanotubos de Carbono/ultraestrutura , Oxirredução
15.
Small ; 15(11): e1900358, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30735307

RESUMO

Due to its electronic structure, similar to platinum, molybdenum carbides (Mo2 C) hold great promise as a cost-effective catalyst platform. However, the realization of high-performance Mo2 C catalysts is still limited because controlling their particle size and catalytic activity is challenging with current synthesis methods. Here, the synthesis of ultrafine ß-Mo2 C nanoparticles with narrow size distribution (2.5 ± 0.7 nm) and high mass loading (up to 27.5 wt%) on graphene substrate using a giant Mo-based polyoxomolybdate cluster, Mo132 ((NH4 )42 [Mo132 O372 (CH3 COO)30 (H2 O)72 ]·10CH3 COONH4 ·300H2 O) is demonstrated. Moreover, a nitrogen-containing polymeric binder (polyethyleneimine) is used to create MoN bonds between Mo2 C nanoparticles and nitrogen-doped graphene layers, which significantly enhance the catalytic activity of Mo2 C for the hydrogen evolution reaction, as is revealed by X-ray photoelectron spectroscopy and density functional theory calculations. The optimal Mo2 C catalyst shows a large exchange current density of 1.19 mA cm-2 , a high turnover frequency of 0.70 s-1 as well as excellent durability. The demonstrated new strategy opens up the possibility of developing practical platinum substitutes based on Mo2 C for various catalytic applications.

16.
Biomed Chromatogr ; 33(4): e4457, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30520064

RESUMO

Angelica sinensis (Danggui, DG) parched with alcohol (Jiu Danggui, JDG) and charred DG are the main processed products of DG, which are used to treat blood stasis syndrome (BSS). However, their therapeutic effect and mechanisms are still unclear. Based on an acute rat BSS model, the intervention effects of DG and its processed products (DGPPs) were evaluated by the hemorheology and coagulation function parameters. Meanwhile, plasma and urine metabolites were detected and analyzed by liquid chromatography coupled to quadrupole time-of-flight mass spectrometry and multivariate statistical analysis method. The results of hemorheology, coagulation function parameters and metabolomics all showed that the BSS model was successfully established, DGPPs intervention could significantly relieve rats BSS and the therapeutic effect of JDG was best. Moreover, 23 differential metabolites (14 in plasma and nine in urine) were identified that were closely related to the BSS, involving seven potential target metabolic pathways. DGPP intervention showed different degrees of reverse effect on these metabolites. JDG was the most effective owing to extensive regulation effect on differential metabolites. This study provides a reference for understanding the pathological mechanism of BSS and the mechanism of DGPPs, which lays a theoretical foundation for the rational use of DGPPs in clinical practice.


Assuntos
Angelica sinensis , Circulação Sanguínea/efeitos dos fármacos , Medicamentos de Ervas Chinesas/análise , Medicina Tradicional Chinesa , Metaboloma/efeitos dos fármacos , Animais , Biomarcadores/sangue , Biomarcadores/urina , Cromatografia Líquida de Alta Pressão , Medicamentos de Ervas Chinesas/farmacocinética , Medicamentos de Ervas Chinesas/farmacologia , Feminino , Metabolômica , Ratos , Ratos Wistar , Reprodutibilidade dos Testes
17.
Environ Sci Technol ; 52(21): 12642-12648, 2018 11 06.
Artigo em Inglês | MEDLINE | ID: mdl-30335978

RESUMO

Coagulation is an important process to remove organics from water. The molecular composition and structure of organic matter influence water quality in many ways, and the lack of information regarding the organics removed by different coagulants makes it challenging to optimize coagulation processes and ensure reclaimed water safety. In this paper, we investigated coagulation of secondary biological effluent from a municipal sewage treatment plant with different coagulants. We emphasized investigation of organics removal characteristics at the molecular level using Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) coupled with electrospray ionization (ESI). We found that conventional coagulants can only partially remove condensed polycyclic aromatics and polyphenols with low H/C (H/C < 0.7) and highly unsaturated and phenolic compounds and aliphatic compounds with high O/C (O/C > 0.6). A new coagulant, CBHyC, had better removal efficiencies for all organics with different element compositions and molecular structures, especially organics that are resistant to conventional coagulants such as highly unsaturated and phenolic compounds and aliphatic compounds located in 0.3 < O/C < 0.8 and 1.0 < H/C < 2.0 regions and sulfur-containing compounds with higher O/C (e.g., anionic surfactants and their metabolites or coproducts). This study provides molecular insights into the organics removed by different coagulants and provides data supporting the possible optimization of advanced wastewater treatment processes.


Assuntos
Esgotos , Purificação da Água , Espectrometria de Massas , Águas Residuárias , Água
18.
Environ Sci Technol ; 51(14): 8110-8118, 2017 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-28628308

RESUMO

Landfill leachate concentrate is a type of refractory organic wastewater with high environmental risk. Identification of refractory components and insights into the molecular transformations of the organics are essential for the development of efficient treatment process. In this report, molecular compositions of dissolved organic matter (DOM) in leachate concentrate, as well as changes after anaerobic/aerobic biodegradation and coagulation with salts, were characterized using electrospray ionization (ESI) coupled with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). DOM in leachate concentrate were more saturated and less oxidized with more nitrogen and sulfur-containing substances (accounting for 50.0%), comparing with natural organic matter in Suwannee River. Selectivity for different classes of organics during biodegradation and coagulation processes was observed. Substances with low oxidation degree (O/C < 0.3) were more reactive during biodegradation process, leading to the formation of highly oxidized molecules (O/C > 0.5). Unsaturated (H/C < 1.0) and oxidized (O/C > 0.4) substances containing carboxyl groups were preferentially removed after coagulation with Al or Fe sulfate. The complementary functions of biodegradation and coagulation in the treatment of DOM in leachate concentrate were verified at the molecular level. Lignin-derived compounds and sulfur-containing substances in leachate concentrate were resistant to biodegradation and coagulation treatments. To treat leachate concentrate more effectively, processes aimed at removal of such DOM should be developed.


Assuntos
Biodegradação Ambiental , Águas Residuárias/química , Poluentes Químicos da Água/química , Eliminação de Resíduos , Rios , Sais , Poluentes Químicos da Água/metabolismo
19.
Water Res ; 249: 120982, 2024 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-38101048

RESUMO

Two-pass reverse osmosis (RO) process is prevailing in seawater desalination, but each process must consume considerable amounts of chemicals to secure product water quality. Caustic soda is used to raise the pH of the first-pass RO permeate (also the second-pass RO feed) to ensure adequate removal of boron in the subsequent second-pass RO, while antiscalants and disinfectants such as hypochlorite are added in the feed seawater for scaling and biofouling control of the first-pass RO membranes. Here, we report for the first time a flow-through electrochemically assisted reverse osmosis (FT-EARO) module system used in the first-pass RO, aiming to dramatically reduce or even eliminate chemical usage for the current RO desalination. This novel system integrated an electroconductive permeate carrier as cathode and an electroconductive feed spacer as anode on each side of the first-pass RO membrane. Upon applying an extremely low-energy (< 0.005 kWh/m3) electrical field, the FT-EARO module could (1) produce a permeate with pH >10 with no alkali dosage, ensuring sufficient boron removal in the second-pass RO, and (2) generate protons and low-concentration free chlorine near the membrane surface, potentially discouraging membrane scaling and biofouling while maintaining satisfactory desalination performance. The current study further elucidated the high scalability of this novel electrified high-pressure RO module design. The low-chemical manner of FT-EARO presents an attractive practical option towards green and sustainable seawater desalination.


Assuntos
Incrustação Biológica , Purificação da Água , Osmose , Boro , Membranas Artificiais , Água do Mar
20.
J Ethnopharmacol ; 326: 117874, 2024 May 23.
Artigo em Inglês | MEDLINE | ID: mdl-38342152

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: The efficacy of Shaoyao Decoction (SYD), a traditional Chinese medicine prescription, in treating damp-heat colitis is established, but its underlying mechanism remains to be elucidated. AIM OF THE STUDY: Our study aims to investigate the effect and mechanism of action of SYD in treating damp-heat colitis. MATERIALS AND METHODS: A mouse model of damp-heat colitis was induced and treated with SYD via gavage for seven days. The therapeutic efficacy of SYD was assessed through clinical indicators and histopathological examinations. The inflammatory factors and oxidative stress parameters were detected by ELISA and biochemical kits. We also analyzed alterations in the gut microbiome via 16 S rRNA gene sequencing and quantified serum indole derivatives using targeted tryptophan metabolomics. Western blotting and immunofluorescence were used to detect the expressions of AHR, CYP1A1, STAT3 and tight junction (TJ) proteins. The ELISA kit was utilized to detect the content of antibacterial peptides (Reg3ß and Reg3γ) in colon. The immunohistochemistry was employed to detect the expressions of proliferating cell nuclear antigen (PCNA) protein. RESULTS: SYD effectively alleviated symptoms in mice with damp-heat colitis, including body weight loss, shortened colon, elevated DAI, enlarged spleen, and damage to the intestinal mucosa. SYD notably reduced IL-6, TNF-α, IL-1ß and MDA levels in colon tissues, while increasing IL-10 and T-AOC levels. Furthermore, SYD mitigated gut microbiota disturbance, restored microbial tryptophan metabolite production (such as IA, IAA, and IAld), notably increased the protein levels of AHR, CYP1A1 and p-STAT3 in colon tissue, and elevated the IL-22 level. Moreover, the expression levels of Reg3ß, Reg3γ, occludin, ZO-1 and PCNA were increased in SYD group. CONCLUSION: Our study showed that SYD ameliorates damp-heat colitis by restructuring gut microbiota structure, enhancing the metabolism of tryptophan associated with gut microbiota to activate the AHR/IL-22/STAT3 pathway, thereby recovering damaged intestinal mucosa. This research offers novel insights into the therapeutic mechanisms of SYD on damp-heat colitis.


Assuntos
Colite Ulcerativa , Colite , Microbioma Gastrointestinal , Animais , Camundongos , Antígeno Nuclear de Célula em Proliferação , Triptofano , Citocromo P-450 CYP1A1 , Temperatura Alta , Interleucina 22 , Modelos Animais de Doenças , Sulfato de Dextrana , Colite Ulcerativa/tratamento farmacológico , Camundongos Endogâmicos C57BL , Colo
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