421 results match your criteria: "Nankai University Tianjin[Affiliation]"

Macroinvertebrates play a vital role in coastal ecosystems and are an important indicator of ecosystem quality. Both anthropogenic activity and environmental changes may lead to significant changes in the marine macroinvertebrate community. However, the assembly process of benthic biodiversity and its mechanism driven by environmental factors at large scales remains unclear.

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Background And Aims: The National Standardized Training for Resident Doctors (STRD) in mainland China encounters many challenges in its implementation. To investigate whether outpatients are willing to undergo indirect ophthalmoscopy examination conducted by ophthalmology residents in the ophthalmology STRD program in China.

Methods: This study conducted a cross-sectional survey at the Eye Hospital of Wenzhou Medical University between September 2021 and September 2023.

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Scope: Early diabetic retinopathy (DR) is characterized by chronic inflammation, excessive oxidative stress, and retinal microvascular damage. Syringaresinol (SYR), as a natural polyphenolic compound, has been proved to inhibit many disease progression due to its antiinflammatory and antioxidant properties. The present study focuses on exploring the effect of SYR on hyperglycemia-induced early DR as well as the underlying mechanisms.

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Copper and conjugated carbonyls of metal-organic polymers as dual redox centers for Na storage.

Chem Sci

February 2024

Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University Tianjin 300071 China

Article Synopsis
  • Metal-organic polymers (MOPs) like Cu-TABQ are emerging as effective and cost-efficient materials for sodium-ion batteries due to their multiple redox centers.
  • Cu-TABQ is created using a specific organic ligand and copper, allowing for a unique three-electron transfer reaction that provides high energy capacity.
  • Its flower-like structure not only facilitates rapid sodium movement but also shows impressive durability, maintaining performance over 700 cycles, highlighting its potential for future battery applications.
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Snap-shots of cluster growth: structure and properties of a Zintl ion with an Fe core, [FeSn].

Chem Sci

January 2024

State Key Laboratory of Elemento-Organic Chemistry, Tianjin Key Lab for Rare Earth Materials and Applications, School of Materials Science and Engineering, Nankai University Tianjin 300350 China

The endohedral Zintl-ion cluster [FeSn] contains a linear Fe core with short Fe-Fe bond lengths of 2.4300(9) Å. The ground state is a septet, with significant σ and π contributions to the Fe-Fe bonds.

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N-heterocycles are important chemical hydrogen-storage materials, and the acceptorless dehydrogenation and hydrogenation of N-heterocycles as organic hydrogen carriers have been widely studied, with the main focus on the catalyst synthesis and design, investigation of the redox mechanisms, and extension of substrate scope. In this work, the Gibbs free energies of the dehydrogenation of pre-aromatic N-heterocycles (YH) and the hydrogenation of aromatic N-heterocycles (Y), , Δ(YH) and Δ(Y), were derived by constructing thermodynamic cycles using Hess' law. The thermodynamic abilities for the acceptorless dehydrogenation and hydrogenation of 78 pre-aromatic N-heterocycles (YH) and related 78 aromatic N-heterocycles (Y) were well evaluated and discussed in acetonitrile.

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The current study aims to examine how the morphology of ultra-high molecular weight polyethylene (UHMWPE) particles impacts the kinetics of non-isothermal crystallization in high-density polyethylene (HDPE). To prepare blends of HDPE and UHMWPE, melt blending is utilized. High-temperature melting and subsequent shearing are used to cause the morphological changes in UHMWPE particles.

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Background: Cardiac conduction diseases can lead to life-threatening outcomes. However, the evidence on risk factors for conduction disease that is needed to underpin prevention strategies is limited. The present study aimed to determine the association between type 2 diabetes and cardiac conduction diseases.

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Purpose: To investigate the effect of lingual wedge shaped coronectomy in extraction of horizontally impacted mandibular third molar(HIMTM).

Methods: A total of 172 patients with HIMTM were randomly divided into experimental group and routine group with 86 cases in each group . Lingual wedge-shaped coronectomy was applied in the experimental group and T-shaped coronectomy was applied in routine group.

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Zu, , Zu, and Zu, are described as new to science; Anis & Hayat, 1998, (De Stefani, 1898) and Krishnachaitanya & Manickavasagam, 2016 are newly recorded from China. A key to Chinese species based on females is also presented.

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Recent advances in combining photo- and N-heterocyclic carbene catalysis.

Chem Sci

November 2023

State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University Tianjin 300071 People's Republic of China

N-Heterocyclic carbenes (NHCs) are unique Lewis basic catalysts that mediate various organic transformations by means of polarity reversal. Although the scope of research on two-electron reactions mediated by NHC catalysts has been expanding, the types of these reactions are limited by the inability of NHCs to engage sp-electrophiles. However, the revival of photocatalysis has accelerated the development of free-radical chemistry, and combining photoredox catalysis and NHC catalysis to achieve NHC-mediated radical reactions under mild conditions could overcome the above-mentioned limitation.

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Developing new and understanding multicomponent reactions (MCRs) is an appealing but challenging task. Herein, Rh(iii)-catalyzed multicomponent double C-H annulations of cyclic diimines (or diketones and acetone), alkynes, and ammonium acetate to assemble functionalized 1,1'-biisoquinolines and C-bridged 1,1'-bisisoquinolines with controllable N/N editing in one shot has been developed. Through a combination of isotopic-labeling (H, O, and N) experiments, crystallography, and time-dependent ESI-MS, the reaction process was studied in detail.

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Ni-rich cathode materials suffer from rapid capacity fading caused by interface side reactions and bulk structure degradation. Previous studies show that Co is conducive to bulk structure stability and sulfate can react with the residual lithium (LiOH and LiCO) on the surface of Ni-rich cathode materials and form a uniform coating to suppress the side reactions between the cathode and electrolyte. Here, CoSO is utilized as a modifier for LiNiCoMnO (NCM811) cathode materials.

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Telomerase-activated Au@DNA nanomachine for targeted chemo-photodynamic synergistic therapy.

RSC Med Chem

November 2023

State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Research Centre for Analytical Sciences, College of Chemistry, Nankai University Tianjin 300071 PR China

We successfully designed a smart activatable nanomachine for cancer synergistic therapy. Photodynamic therapy (PDT) and chemotherapy can be activated by intracellular telomerase while anti-cancer drugs can be effectively transported into tumour cells. An Sgc8 aptamer was designed, which can specifically distinguish tumour cells from normal cells and perform targeted therapy.

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Organocatalytic atroposelective synthesis of axially chiral ,'-pyrrolylindoles indole formation.

Chem Sci

November 2023

College of Chemistry and Molecular Sciences, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, Wuhan University Wuhan Hubei 430072 P. R. China

The first organocatalytic atroposelective synthesis of axially chiral ,'-pyrrolylindoles based on -alkynylanilines was successfully established indole formation catalyzed by chiral phosphoric acid (CPA). This new synthetic strategy introduced CPA-catalyzed asymmetric 5- cyclization of new well-designed -alkynylanilines containing a pyrrolyl unit, resulting in a wide range of axially chiral ,'-pyrrolylindoles in high yields with exclusive regioselectivity and excellent enantioselectivity (up to 99% yield, >20 : 1 rr, 95 : 5 er). Considering the potential biological significance of N-N atropisomers, preliminary biological activity studies were performed and revealed that these structurally important ,'-pyrrolylindoles had a low IC value with promising impressive cytotoxicity against several kinds of cancer cell lines.

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The gut bacteria involves in insect homeostasis by playing essential roles in host physiology, metabolism, innate immunity, and so forth. microRNAs (miRNAs) are endogenous small noncoding RNAs that posttranscriptionally regulate gene expression to affect immune or metabolic processes in insects. For several non-model insects, the available knowledge on the relationship between changes in the gut bacteria and miRNA profiles is limited.

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Regulating the orientation of a single coordinate bond by the synergistic action of mechanical forces and electric field.

Chem Sci

October 2023

Institute of Modern Optics, Center of Single Molecule Sciences, Key Laboratory of Micro-scale Optical Information Science and Technology, Nankai University Tianjin 300350 China.

The molecular binding orientation with respect to the electrode plays a pivotal role in determining the performance of molecular devices. However, accomplishing modulation of single-molecule binding orientation remains a great challenge due to the lack of suitable testing systems and characterization approaches. To this end, by employing a developed STM-BJ technique, we demonstrate that the conductance of pyridine-anchored molecular junctions decreases as the applied voltage increases, which is determined by the repeated formation of thousands of gold-molecule-gold dynamic break junctions.

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Photo-caged 2-butene-1,4-dial as an efficient, target-specific photo-crosslinker for covalent trapping of DNA-binding proteins.

Chem Sci

October 2023

State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, Department of Chemical Biology, College of Chemistry, Nankai University Tianjin 300071 China

Covalent trapping of DNA-binding proteins photo-crosslinking is an advantageous method for studying DNA-protein interactions. However, traditional photo-crosslinkers generate highly reactive intermediates that rapidly and non-selectively react with nearby functional groups, resulting in low target-capture yields and high non-target background capture. Herein, we report that photo-caged 2-butene-1,4-dial (PBDA) is an efficient photo-crosslinker for trapping DNA-binding proteins.

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Due to the existence of the blood-brain barrier in glioma, traditional drug therapy has a poor therapeutic outcome. Emerging immunotherapy has been shown to have satisfactory therapeutic effects in solid tumors, and it is clinically instructive to explore the possibility of immunotherapy in glioma. We performed a retrospective analysis of RNA-seq data and clinical information in 1027 glioma patients, utilizing machine learning to explore the relationship between tyrosine metabolizing enzymes and clinical characteristics.

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The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic resulted in significant societal costs. Hence, an in-depth understanding of SARS-CoV-2 virus mutation and its evolution will help determine the direction of the COVID-19 pandemic. In this study, we identified 296,728 de novo mutations in more than 2,800,000 high-quality SARS-CoV-2 genomes.

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Longitudinal studies have indicated the pivotal role of natural killer cells (NKs) in the elimination of certain infections and malignancies. Currently, perinatal blood (PB) and cord blood (CB) have been considered with promising prospective for autogenous and allogeneic NKs transplantation, yet the similarities and differences at the biological and molecular levels are largely obscure. We isolated mononuclear cells (MNCs) from PB and CB, and compared the biological phenotypes of resident NKs by flow cytometry and cell counting.

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Understanding patterns of intraspecific trait variation can help us understand plant adaptability to environmental changes. To explore the underlying adaptation mechanisms of zonal plant species, we selected seven populations of , a dominant species in the Inner Mongolia Steppe of China, and evaluated the effects of phenotypic plasticity and genetic differentiation, the effects of climate variables on population trait differentiation, and traits coordinated patterns under each soil moisture treatment. We selected seeds from seven populations of in the Inner Mongolia Steppe, China, and carried out a soil moisture (2) × population origin (7) common garden experiment at Tianjin City, China, and measured ten plant traits of .

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Immune checkpoint blockades are the most promising therapy in lung adenocarcinoma (LUAD). However, the response rate remains limited, underscoring the urgent need for effective sensitizers. Interleukin 4 induced 1 (IL4I1) is reported to have immunoinhibitory and tumor-promoting effects in several cancers.

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Chiral -difluoroalkyl reagents: -difluoroalkyl propargylic borons and -difluoroalkyl α-allenols.

Chem Sci

August 2023

Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China

Chiral fluorinated reagents provide new opportunities for the discovery of drugs and functional materials because the introduction of a fluorinated group significantly alters a molecule's physicochemical properties. Chiral -difluoroalkyl fragments (R-CF-C*) are key motifs in many drugs. However, the scarcity of synthetic methods and types of chiral -difluoroalkyl reagents limits the applications of these compounds.

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The vertical integration of two-dimensional (2D) materials through weak van der Waals (vdW) interactions is gaining tremendous attention for application in nanotechnology and photovoltaics. Here, we performed first-principles study of the electronic band structure, optical and photocatalytic properties of vertically stacked heterostructures based on boron pnictides BX (X = As, P) and SiS monolayers. Both heterobilayers possess a stable geometry and reveal type I band alignment with a direct band gap, indicating substantial transfer of charge across the junction of the same layer.

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