Publications by authors named "Ren Chang"

Background: Increasing evidence of circadian biology may influence the physiopathologic mechanism, progression, and recovery of stroke. However, few data have shown about circadian rhythm on futile recanalization (FR) in patients treated with endovascular treatment (EVT).

Methods: From 2017 to 2021, an observational cohort of acute ischemic stroke (AIS) patients with large vessel occlusion (LVO) underwent EVT was conducted.

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The direction variation of the fundamental wave in the same nonlinear photonic crystal would cause different pattern of harmonics generation. In a 2D/3D crystal with dense reciprocal lattice vectors, there will be large numbers of conical harmonic beams evolving with direction change of the fundamental wave. By rearranging the Ewald sphere and superposing it into the Ewald shell, we have a hybrid Ewald construction.

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  • * A clinical trial involving 63 women with various gynecological conditions showed that robotic LESS surgery had a good average operative time, blood loss, and satisfactory recovery outcomes.
  • * The study found no complications or need for alternative surgical methods, indicating that the SHURUI system is both technically feasible and safe for patients, paving the way for future comparisons with traditional surgery.
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The agglomeration effect significantly influences firms' site selection. Manufacturing firms often exhibit intricate spatial co-location patterns that are indicative of agglomerations due to their reliance on material input and product output across various subdivisions of manufacture. In this study, we present an analytical approach employing the Q statistic and additive color mixing visualization to assess co-location patterns of manufacturing firms.

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Environmental pollution stands as one of the most critical challenges affecting human health, with an estimated mortality rate linked to pollution-induced non-communicable diseases projected to range from 20% to 25%. These pollutants not only disrupt immune responses but can also trigger immunotoxicity. Phosphoinositide signaling, a pivotal regulator of immune responses, plays a central role in the development of autoimmune diseases and exhibits high sensitivity to environmental stressors.

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  • Superplastic metals, known for their impressive ductility over 300%, are sought after for creating intricate engineering components but face various limitations like low strength and costly processing.
  • Research highlights a high-strength lightweight medium entropy alloy (Ti V Zr Nb Mo) with ultrafine particles that demonstrates superior coarse-grained superplasticity (>440%) at high temperatures and strain rates.
  • This study reveals a unique deformation mechanism that combines dislocation slip, dynamic recrystallization, and grain boundary sliding, paving the way for enhanced superplastic forming techniques and the future development of stronger alloys.
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Objective: To evaluate the long-term efficacy and quality of life concerning sacrospinous ligament fixation (SSLF) using conventional instruments for Chinese women with symptomatic stage 2 and 3 apical prolapse.

Methods: This single-arm prospective cohort study was conducted at our hospital between October 2011 and December 2018. Eligible participants were followed up over 3 years after surgery.

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It remains a great challenge to design and synthesize organic luminescent molecules with strong emission in both dilute solution and aggregate state. Herein, an organic cage with dodecadansyl groups (D-RCC1) from an easy sulfonation reaction displays strong emissive behavior in dilute organic solution with a quantum yield of 42%. Moreover, D-RCC1 exhibits an ultrahigh quantum yield of 92% in the solid state, which is more than 3 times that of 27% for the model compound D-DEA.

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To evaluate the clinical efficacy and safety of Xiaoaiping injection combined with chemotherapy in the treatment of advanced gastric cancer by meta-analysis. Seven databases, including China National Knowledge Infrastructure (CNKI), Wanfang Database, VIP Database, Cochrane Library, PubMed, Embase, and Web of Science, were searched by computer for randomized controlled clinical trials of Xiaoaiping injection combined with chemotherapy in the treatment of gastric cancer. Risk of bias assessment and meta-analysis were performed by Review Manager 5.

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P. guajava was partitioned into aqueous and ethyl acetate fractions and studied for its antibacterial chemical constituents. The minimum inhibitory concentrations of the aqueous and ethyl acetate partitions against Escherichia coli, Salmonella Typhimurium, and Staphylococcus aureus were found to be 0.

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Secondary metabolites from natural sources are promising starting points for discovering and developing drug prototypes and new drugs, as many current treatments for numerous diseases are directly or indirectly related to such compounds. Recent advances in bioinformatics tools and molecular networking methods have made it possible to identify novel bioactive compounds. In this study, a workflow combining network-based methods for identifying bioactive compounds found in natural products was streamlined by innovating an automated bioinformatics software.

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Background: This study aimed to quantify total lymphatic fluid spaces of the inner ears volumetrically in the dog in order to find a correlation between the lymphatic volume of the inner ears and motion sickness susceptibility.

Methods: A total of 16 healthy adult Beagle dogs were used to delineate the lymphatic fluid spaces of inner ears by magnetic resonance imag- ing with a 3-dimensional-constructive interference steady-state sequence. Manual segmentation was applied for 3-dimensional reconstruction and volumetric quantification of total lymphatic space.

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NaNO/MgO/titania spheres prepared via aerosol-assisted self-assembly (AASA) were used as sorbents for CO adsorption at moderate temperature. The titania framework as support would allow MgO to disperse well, thereby increasing the contact between MgO and NaNO to enhance carbonation. In this study, the effect of Mg/Ti molar ratio and NaNO addition amount on CO adsorption was investigated.

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Molecular chaperones are diverse biomacromolecules involved in the maintenance of cellular protein homeostasis (proteostasis). Here we demonstrate that in contrast to most chaperones with defined three-dimensional structures, the acid-inducible protein Asr in Escherichia coli is intrinsically disordered and exhibits varied aggregation-preventing or aggregation-promoting activities, acting as a "conditionally active chaperone". Bioinformatics and experimental analyses of Asr showed that it is devoid of hydrophobic patches but rich in positive charges and local polyproline II backbone structures.

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  • Sulcardine sulfate (Sul) is an innovative antiarrhythmic drug currently undergoing evaluations in clinical trials, with a new injectable formulation developed for urgent patient needs.* -
  • The study assessed Sul's pharmacokinetics through various methods, including animal testing for plasma protein binding, metabolism, biodistribution, and excretion, finding notable differences in metabolic stability among species.* -
  • The research successfully created a physiologically based pharmacokinetics (PBPK) model that effectively predicted Sul's pharmacokinetic behavior, helping to anticipate its effects in human subjects following intravenous administration.*
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Background: Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, as congenital anomaly of the female reproductive tract, is characterized by the congenital absence of uterus and vagina. Dilation maneuver was recommended as the nonsurgical treatment for these patients. However, only several cases were reported depicting the prolapse of the dilated neovagina of patients with MRKH syndrome.

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Covid-19 interventions are greatly affecting patterns of human mobility. Changes in mobility during Covid-19 have differed across socio-economic gradients during the first wave. We use fine-scale network mobility data in Ontario, Canada to study the association between three different mobility measures and four socio-economic indicators throughout the first and second wave of Covid-19 (January to December 2020).

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Protein stability affects the physiological functions of proteins and is also a desirable trait in many protein engineering tasks, yet improving protein stability is challenging because of limitations in methods for directly monitoring protein stability in cells. Here, we report an in vivo stability biosensor wherein a protein of interest (POI) is inserted into a microbial enzyme (CysG) that catalyzes the formation of endogenous fluorescent compounds, thereby coupling POI stability to simple fluorescence readouts. We demonstrate the utility of the biosensor in directed evolution to obtain stabilized, less aggregation-prone variants of two POIs (including nonamyloidogenic variants of human islet amyloid polypeptide).

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Ursolic acid (UA) is a common pentacyclic triterpene phytochemical with various pharmacological activities. However, UA is classified as a class IV drug in BCS system and its development as an oral drug is limited. Pulmonary delivery is an effective way to improve the bioavailability of drugs with low absorption.

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Objective: To compare safety, efficacy, and impact on quality of life (QoL) between ischial spine fascia fixation (ISFF) and sacrospinous ligament fixation (SSLF) for stage 2-3 pelvic organ prolapse (POP).

Method: A prospective cohort study among women with POP attending a national referral university hospital in Beijing, China, between May 2007 and May 2015. Women underwent either ISFF or SSLF.

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Objective: Pulmonary delivery is an effective way to improve the bioavailability of drugs with extensive metabolism. This research was designed to study the different pharmacokinetic behaviours of small molecule drug after pulmonary delivery and intragastric (i.g) administration.

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The soluble expression of recombinant proteins in Escherichia coli is vital for protein applications in biotechnology and pharmaceuticals. However, the use of E. coli for efficient heterologous protein expression is hampered by several factors, such as poor expression and protein aggregation.

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