A5112136659- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Complex Network Analysis Techniques
- Metalloenzymes and iron-sulfur proteins
- Advanced Graph Neural Networks
- Electrocatalysts for Energy Conversion
- Metal-Catalyzed Oxygenation Mechanisms
- Crystallography and molecular interactions
- Face and Expression Recognition
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum Dots Synthesis And Properties
- Advanced biosensing and bioanalysis techniques
- Enzyme Structure and Function
- Private Equity and Venture Capital
- Remote Sensing and Land Use
- Opinion Dynamics and Social Influence
- Advanced X-ray Imaging Techniques
- Advanced battery technologies research
- Electron and X-Ray Spectroscopy Techniques
- Image and Video Stabilization
- Porphyrin Metabolism and Disorders
- Catalytic Processes in Materials Science
- Bioinformatics and Genomic Networks
- Graph Theory and Algorithms
- Domain Adaptation and Few-Shot Learning
Beijing University of Chemical Technology
2015-2025
Beijing Normal University
2016-2021
Lawrence Berkeley National Laboratory
2000-2020
Northwest A&F University
2020
Tsinghua University
2018-2019
Indiana University Bloomington
2019
Nanjing Tech University
2019
University of California, Berkeley
2006-2014
Yangzhou University
2009-2014
Berkeley College
2014
In this paper, we report the development of rod-shaped semiconductor nanocrystals (quantum rods) as fluorescent biological labels. Water-soluble biocompatible quantum rods have been prepared by surface silanization and applied for nonspecific cell tracking well specific cellular targeting. Quantum are brighter single molecule probes compared to dots. They many potential applications labels in situations where their properties offer advantages over
Resonant inelastic X-ray scattering (RIXS) was used to collect Mn K pre-edge spectra and study the electronic structure in oxides, molecular coordination complexes, as well S1 S2 states of oxygen-evolving complex (OEC) photosystem II (PS II). The RIXS data yield two-dimensional plots that can be interpreted along incident (absorption) energy or transfer axis. second dimension separates (predominantly 1s 3d transitions) from main K-edge, a detailed analysis is thus possible. 1s2p final-state...
L-edge X-ray absorption spectroscopy has been used to study, under a variety of conditions, the electronic structure Ni in Ni−Fe hydrogenases from Desulfovibrio gigas, baculatus, and Pyrococcus furiosus. The status enzyme films for these measurements was monitored by FT-IR spectroscopy. spectra were interpreted ligand field multiplet simulations comparison with data model complexes. spectrum D. gigas "form A" is consistent covalent Ni(III) species. In contrast, all reduced samples exhibited...
Constructing nanoscale hybrid materials with unique interfacial structures by using various metal oxides and carbon supports as building blocks are of great importance to develop highly active, economical catalysts for oxygen reduction reaction (ORR). In this work, La2O2CO3 encapsulated La2O3 nanoparticles on a black (La2O2CO3@La2O3/C) were fabricated via chemical precipitation in an aqueous solution containing different concentrations cetyltrimethyl ammonium bromide (CTAB), followed...
Network embedding is a general-purpose machine learning technique that encodes network structure in vector spaces with tunable dimension. Choosing an appropriate dimension -- small enough to be efficient and large effective challenging but necessary generate embeddings applicable multitude of tasks. Existing strategies for the selection rely on performance maximization downstream Here, we propose principled method such all structural information parsimoniously encoded. The validated various...
The nickel(I) complex [PhTt(Ad)]Ni(CO) (PhTt(Ad), phenyltris((1-adamantylthio)methyl)borate) reacts with O(2) generating a 1:1 species identified as side-on dioxygen adduct based on its spectroscopic properties supported by DFT computational results and reactivity. Ni EXAFS data are fit to S(3)O(2) coordination environment short Ni-O distances, 1.85 A. brown displays rhombic EPR signal g values of 2.24, 2.19, 2.01. INDO/S-CI computations replicate the features suggest that 2 is [NiO(2)](+)...
A series of nickel dithiolene complexes Ni[S2C2(CF3)2]2(n) (n = -2, -1, 0) has been investigated using Ni L- and K-edge X-ray absorption spectroscopy (XAS). The L3 centroid shifts about 0.3 eV for a change one unit in the formal oxidation state (or per oxi), corresponding to ~33% shift oxides or fluorides (about 0.9 oxi). XAS edge position 0.7 oxi, ~38% that (1.85 In addition, L sum rule analysis found Ni(3d) ionicity frontier orbitals being 50.5%, 44.0% 38.5% respectively (for n 0),...
The bifunctional CO dehydrogenase/acetyl-CoA synthase (CODH/ACS) plays a central role in the Wood−Ljungdahl pathway of autotrophic CO2 fixation. One structure Moorella thermoacetica enzyme revealed that active site ACS (the A-cluster) consists [4Fe-4S] cluster bridged to binuclear CuNi center with Cu at proximal metal (Mp) and Ni distal (Md). In another same enzyme, or Zn was present Mp. On basis positive correlation between activity content, we had proposed Cu-containing is [Seravalli, J.,...
Network representation learning algorithms, which aim at automatically encoding graphs into low-dimensional vector representations with a variety of node similarity definitions, have wide range downstream applications. Most existing methods either low accuracies in tasks or very limited application field, such as article classification citation networks. In this paper, we propose novel network method, named Link Prediction based Representation (LPNR), generalizes the latest graph neural and...
The biologically active form of the essential trace element chromium is believed to be oligopeptide chromodulin. Chromodulin binds four chromic ions before binding at or near site activating insulin receptor and subsequently potentiating tyrosine kinase activity receptor. Charge balance arguments preliminary spectroscopic studies suggested that centers might part a multinuclear assembly. Using combination X-ray absorption electron paramagnetic resonance spectroscopies variable-temperature...
The bifunctional CO dehydrogenase/acetyl-CoA synthase (CODH/ACS) plays a central role in the Wood–Ljungdahl pathway of autotrophic 2 fixation. A recent structure Moorella thermoacetica enzyme revealed that ACS active site contains [4Fe-4S] cluster bridged to binuclear Cu-Ni site. Here, biochemical and x-ray absorption spectroscopic (XAS) evidence is presented copper ion at M. essential. Depletion correlates with reduction activity intensity “NiFeC” EPR signal without affecting either or...
The interficial covalent bonds formed in La<sub>2</sub>O<sub>3</sub>/C hybrid are responsible for its enhanced ORR activity.
Networks are powerful tools for representing the relationships and interactions between entities in various disciplines. However, existing network analysis packages either lack functionality or not scalable large networks. In this descriptor, we present EasyGraph, an open-source library that supports several data formats mining algorithms. EasyGraph provides excellent operating efficiency through a hybrid Python/C++ implementation multiprocessing optimization. It is applicable to disciplines...
Carbon monoxide dehydrogenase from Clostridium thermoaceticum (Ct-CODH) is a nickel-containing enzyme that catalyzes acetyl-CoA synthesis and CO oxidation at two separate Ni sites, the A-cluster C-cluster, respectively. Rhodospirillum rubrum (Rr-CODH) contains only C-type cluster oxidation. We have used L-edge X-ray absorption spectroscopy to study electronic structure of these enzymes. The spectra indicate most in as-isolated Ct-CODH low-spin Ni(II). Upon treatment, fraction nickel...
The NiFe-dinuclear complexes [{Fe(NS3)(CO)2-S,S′}NiCl(dppe)] 1, [{Fe(NS3)(CO)-S,S′}NiCl(dppe)] 2, [{Fe(NS3)(NO)-S,S′}NiCl(dppe)] 3, [{Fe(NS3)(NO)-S,S′}Ni(CH3)(dppe)] 4, [Ni{Fe(NS3)(CO)-S,S′}2] 5 have been prepared using the anions [Fe(NS3)(CO)]− and [Fe(NS3)(NO)]− (NS3 = N(CH2CH2S)33−) as chelate ligands to nickel. Crystal structure characterisation has carried out on 3 5. spectroscopic properties of measured. Complex 1 is a good structural analogue active form site NiFe-hydrogenase....
The electronic energy level of lanthanum compounds plays an important role in the oxygen reduction reaction (ORR) electrocatalytic process. In this work, three compounds, LaOHCO3 , La2 O2 CO3 and O3 have been synthesized through situ urea hydrolysis method, followed by annealing at different temperatures. Among these layer-structured has smallest band gap moderate values conduction (CB) valence (VB). Electrochemical measurements 0.1 m KOH solution shown that, compared with other catalysts,...
The 5-subunit-containing acetyl-CoA decarbonylase/synthase (ACDS) complex plays an important role in methanogenic Archaea that convert acetate to methane, by catalyzing the central reaction of C-C bond cleavage which serves as acetyl donor substrate reacting at ACDS beta subunit active site. properties Ni site A-cluster from Methanosarcina thermophila were investigated. A recombinant, C-terminally truncated form was employed, mimics native previously isolated complex, and contains composed...
In this paper, the Algorithm of face detection based on AdaBoost was studied, which is multi-classifier cascade algorithm and can attain real-time in system. It a to automatically generate classifier training process, effectively avoid phenomenon over trained. Compare traditional feature subspace algorithm, rate mentioned paper not only higher nearly 10 percent, velocity also improved by more than one times. Also it very robust illumination, pose etc variations suitable for