Herein, we perform a topological transformation by guest induction, converting [2]catenane Rh-1 into the Rh-3 molecular figure-of-eight. The transformation involves the interaction of longer π-acceptor half-sandwich...
详细信息
Herein, we perform a topological transformation by guest induction, converting [2]catenane Rh-1 into the Rh-3 molecular figure-of-eight. The transformation involves the interaction of longer π-acceptor half-sandwich RhⅢbimetallic building block B1 [(Cp*Rh)2(TPPHZ)](OTf)4and π-donor bipyridyl ligands 4,4'-bis((pyridin-4-ylthio)methyl)-1,1'-biphenyl with four molecules of pyrene under ambient temperature in high yields. Intriguingly, despite the involvement of a single pyrene molecule in modifying [2]catenane Rh-2 by transitioning B1 to B2, the underlying skeleton of Rh-2 remains unaltered. Furthermore, we explored the application of these substances before and after the reaction for near-infrared(NIR) photothermal *** meticulous structural analysis, the π–π stacking interactions play a pivotal role in stabilizing the abovementioned structures, enhancing the nonradiative transitions and initiating photothermal conversion in solution. Based on the results, the introduction of pyrene significantly intensified the π–π stacking interactions but diminished the electron density between the adjacent NDI units, leading to a decrease in the NIR photothermal conversion efficiency(from 58.29% to 51.60%). In this study,an innovative approach is introduced for fabricating valuable half-sandwich-structured NIR photothermal conversion materials,and this research has promising prospects for enhancing the field of materials science with potential candidates for future development.
Nanogenerators utilize nanomaterials to harvest mechanical or thermal energy at the micro-nano scale,thereby providing power for small self-sustaining *** to traditional generators,nanogenerators offer advantages such...
详细信息
Nanogenerators utilize nanomaterials to harvest mechanical or thermal energy at the micro-nano scale,thereby providing power for small self-sustaining *** to traditional generators,nanogenerators offer advantages such as compact size,high flexibility,and broad *** nanogenerators(TENGs),based on triboelectric theory,can collect energy from mechanical sources such as vibrations or sliding *** hold promise for powering small ***,the high pulse characteristics of their output voltage prevent them from directly charging electronic *** address the requirements of the internet of things(IoTs),this paper comprehensively reviews state-of-the-art power management systems used to enhance the current stability and output power of ***,the working principle and resistive load output characteristics of TENGs are *** management circuits(PMCs)based on full-wave rectifiers,half-wave rectifiers,and Bennet's doublers are subsequently analyzed and *** and electronic switches proposed to further improve rectifier performance are also *** switches are categorized as travel and voltagetriggered switches,while electronic switches include silicon-controlled rectifiers(SCRs),metal-oxide-semiconductor fieldeffect transistors(MOSFETs),and integrated *** conclusion,the characteristics and applications of PMCs are summarized,along with the identification of existing limitations in their ***,appropriate solutions and prospects for further development are explored.
Structural reconstruction of electrocatalysts plays a pivotal role in catalytic performances for CO_(2)reduction reaction(CO_(2)RR),whereas the behavior is by far superficially ***,we report that CO_(2)accessibility r...
详细信息
Structural reconstruction of electrocatalysts plays a pivotal role in catalytic performances for CO_(2)reduction reaction(CO_(2)RR),whereas the behavior is by far superficially ***,we report that CO_(2)accessibility results in a universal self-adaptive structural reconstruction from Cu_(2)O to Cu@CuxO composites,ending with feeding gas-dependent microstructures and catalytic *** CO_(2)-rich atmosphere favors reconstruction for CO_(2)RR,whereas the CO_(2)-deficient one prefers that for hydrogen evolution *** the assistance of spectroscopic analysis and theoretical calculations,we uncover a CO_(2)-induced passivation behavior by identifying a reductionresistant but catalytic active Cu(I)-rich amorphous layer stabilized by*CO ***,we find extra CO production is indispensable for the robust production of *** inverse correlation between durability and FECO/FEC2H4 is disclosed,suggesting that the selfstabilization process involving the absorption of*CO intermediates on Cu(I)sites is essential for durable *** by this insight,we design hollow Cu_(2)O nanospheres for durable and selective CO_(2)RR electrolysis in producing *** work recognizes the previously overlooked passivation reconstruction and self-stabilizing behavior and highlights the critical role of the local atmosphere in modulating reconstruction and catalytic processes.
AIM:To assess the efficacy and safety of ultrasound cycloplasty(UCP)in lowering intraocular pressure(IOP)among Chinese patients suffering from refractory ***:In this 12-month retrospective study,28 patients with refra...
详细信息
AIM:To assess the efficacy and safety of ultrasound cycloplasty(UCP)in lowering intraocular pressure(IOP)among Chinese patients suffering from refractory ***:In this 12-month retrospective study,28 patients with refractory glaucoma(IOP≥25 mm Hg)were treated with 8-second UCP using either 8 or 10 probe *** principal measure of efficacy was the decrease in IOP at the following intervals after UCP:1d,1,3,6,and 12mo,with each measurement compared to ***:Mean IOP(in mm Hg)was reduced from 46.8±8.9 to 24.5±3.2,27.0±4.8,29.1±4.6,26.1±4.5,and 28.3±4.8 at 1d,1,3,6,and 12mo postoperatively,*** to baseline,IOP reductions at these time points were 45.0%,39.9%,35.3%,41.4%,and 36.7%,*** patients experienced relief from ocular pain after *** cases of choroidal detachment or hypotony was ***:UCP is effective in reducing IOP among Chinese patients with refractory glaucoma and shows a favorable safety profile.
Dry eye disease (DED) is a prevalent and intractable ocular disease induced by a variety of causes. Elevated sphingomyelin (SM) levels and pro-inflammatory cytokines were detected on the ocular surface of DED patients...
详细信息
Dry eye disease (DED) is a prevalent and intractable ocular disease induced by a variety of causes. Elevated sphingomyelin (SM) levels and pro-inflammatory cytokines were detected on the ocular surface of DED patients, particularly in the meibomian glands. Sphingomyelin synthase 2 (SMS2), one of the proteins involved in SM synthesis, would light a novel way of developing a DED therapy strategy. Herein, we report the design and optimization of a series of novel thiophene carboxamide derivatives to afford 14l with an improved highly potent inhibitory activity on SM synthesis (IC50, SMS2 = 28 nmol/ L). Moreover, 14l exhibited a notable protective effect of anti-inflammation and anti-apoptosis on human corneal epithelial cells (HCEC) under TNF-a-hyperosmotic stress conditions in vitro, with an acceptable ocular specific distribution (corneas and meibomian glands) and pharmacokinetics (PK) profiles (t1/2, cornea = 1.11 h;t1/2, meibomian glands = 4.32 h) in rats. Furthermore, 14l alleviated the dry eye symptoms including corneal fluorescein staining scores and tear secretion in a dose-dependent manner in mice. Mechanically, 14l reduced the mRNA expression of Tnf-a, Il-1b and Mmp-9 in corneas, as well as the proportion of very long chain SM in meibomian glands. Our findings provide a new strategy for DED therapy based on selective SMS2 inhibitors. 2025 The Authors. Published by Elsevier B.V. on behalf of Chinese Pharmaceutical Association and Institute of Materia Medica, Chinese Academy of Medical sciences. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).
Growing evidence supports the effectiveness of deep brain stimulation(DBS)in treating various psychiatric *** has the potential to selectively stimulate specific subcortical brain areas thus providing high-frequency e...
详细信息
Growing evidence supports the effectiveness of deep brain stimulation(DBS)in treating various psychiatric *** has the potential to selectively stimulate specific subcortical brain areas thus providing high-frequency electric stimulation of these *** nucleus accumbens(NAc),a frequent DBS target,has shown promise in treating psychiatric conditions like depression,obsessive-compulsive disorder,and *** this review,we provide an overview across studies investigating the effects of NAc DBS in humans and animals and discuss potential mechanisms underlying its clinical *** address the anatomical properties of NAc and discuss,in particular,the frequently reported differential effects of NAc shell and NAc core ***,by outlining the various NAc cell types,transmitter systems(i.e.,predominantly GABAergic and dopaminergic systems)and anatomical pathways that have been shown to be relevant for NAc DBS stimulation effects,we aim to further elucidate the neurobiological determinants of NAc DBS ***,since treatment effects of NAc DBS are most probably also related to alterations in NAc connected circuits or networks,we review studies focusing on the investigation of NAc DBS network *** examining these various components that are assumed to be of relevance in the context of NAc DBS,this review will hopefully contribute to increasing our knowledge about the mechanisms underlying NAc DBS and optimizing future selection of optimal DBS targets.
The comprehension of the composition and physical state of the deep interiors of large planets,as well as the impact events pertinent to planetary formation and evolution,necessitates an understanding of the propertie...
详细信息
The comprehension of the composition and physical state of the deep interiors of large planets,as well as the impact events pertinent to planetary formation and evolution,necessitates an understanding of the properties of planetary materials under extreme ***(Mg2SiO4),a significant geological mineral,has not been fully characterized in terms of its behavior under shock compression due to a lack of consensus among previous experiments and simulations aimed at determining its Hugoniot,as well as the absence of knowledge of sound velocity at high pressures,a critical parameter indicative of phase transformation and *** this study,we delineated the Hugoniot curve of the mineral forsterite up to immense pressures of 1200 *** the first time,we successfully constrained its sound velocity along the Hugoniot curve up to 760 GPa by combining laser-driven shock experiments with first-principles molecular dynamics *** measured Hugoniot data for forsterite corroborated previous findings and suggested the occurrence of incongruent melting during shock ***,along their respective Hugoniot curves,the sound velocity of forsterite was observed to fall between that of the minerals bridgmanite and *** remarkable agreement between the experimental results and simulation data provides reliable sound velocity measurements on the forsterite Hugoniot,which is critical for comprehensively understanding the phase transition and melting behavior of forsterite under ultra-high *** knowledge sheds invaluable light on the behavior of this significant geological mineral under extreme conditions akin to those found in the interiors of planets.
1. Introduction The intensification of nearshore tropical cyclones(TCs), particularly the process of rapid intensification(RI), poses a severe threat to coastal populations due to its short warning time and devastatin...
1. Introduction The intensification of nearshore tropical cyclones(TCs), particularly the process of rapid intensification(RI), poses a severe threat to coastal populations due to its short warning time and devastating impact. It also presents a significant challenge to operational TC forecasting. Therefore, understanding the physical mechanisms and predictability of nearshore TC intensification is of great importance.
Bound states in the continuum(BICs)are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open reso...
详细信息
Bound states in the continuum(BICs)are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and Friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error because its Q-factor is proportional toΔL^(−4),whereΔL embodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective non-Hermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of Fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.
Essential proteins are crucial for biological processes and can be identified through both experimental and computational *** experimental approaches are highly accurate,they often demand extensive time and *** addres...
详细信息
Essential proteins are crucial for biological processes and can be identified through both experimental and computational *** experimental approaches are highly accurate,they often demand extensive time and *** address these challenges,we present a computational ensemble learning framework designed to identify essential proteins more *** method begins by using node2vec to transform proteins in the protein–protein interaction(PPI)network into continuous,low-dimensional *** also extract a range of features from protein sequences,including graph-theory-based,information-based,compositional,and physiochemical ***,we leverage deep learning techniques to analyze high-dimensional position-specific scoring matrices(PSSMs)and capture evolutionary *** then combine these features for classification using various machine learning *** enhance performance,we integrate the outputs of these algorithms through ensemble methods such as voting,weighted averaging,and *** approach effectively addresses data imbalances and improves both robustness and *** ensemble learning framework achieves an AUC of 0.960 and an accuracy of 0.9252,outperforming other computational *** results demonstrate the effectiveness of our approach in accurately identifying essential proteins and highlight its superior feature extraction capabilities.
暂无评论