Publications by authors named "Bo Zou"

215 Publications

Genetic diversity and population structure of the long-tailed hamster Cricetulus longicaudatus in Shanxi Province, China.

Genes Genet Syst 2022 Jan 9. Epub 2022 Jan 9.

Institute of Applied Biology, School of Life Science, Shanxi University.

The long-tailed hamster Cricetulus longicaudatus is a dominant rodent in farmland of Shanxi Province, China, but little is known about its genetic diversity and population structure. In this study, the genomic DNAs of individuals from 13 populations captured in different fields of Shanxi were extracted and amplified by six pairs of microsatellite primers and by universal primers for mtDNA COI gene sequences. Our data revealed significant departure from Hardy-Weinberg equilibrium in four of the 13 populations. In all 13 populations, the mean observed heterozygosity was significantly lower than the expected heterozygosity. Meanwhile, the mean inbreeding coefficient was statistically significant, which indicated non-random mating within populations. The pairwise genetic distance and natural logarithm of linear geographical distance were not significantly correlated for any C. longicaudatus populations. However, the correlation between genetic distance and resistance distance based on mountain landscape was significant, suggesting that the mountain landscape is an important factor affecting gene flow of C. longicaudatus. Pairwise F analysis of population structure showed moderate to high genetic differentiation among populations, and all individuals could be divided into two gene clusters. Phylogenetic analysis based on COI sequences also showed that many individuals originated from a single haplotype, suggesting the existence of gene exchange among these populations at some time in the past. Our research should provide a scientific basis for the analysis of genetic differentiation and gene flow among populations of C. longicaudatus.
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http://dx.doi.org/10.1266/ggs.20-00060DOI Listing
January 2022

Modeling household online shopping demand in the U.S.: a machine learning approach and comparative investigation between 2009 and 2017.

Transportation (Amst) 2021 Dec 2:1-40. Epub 2021 Dec 2.

Institute of Transportation Studies, University of California, Berkeley, USA.

Despite the rapid growth of online shopping and research interest in the relationship between online and in-store shopping, national-level modeling and investigation of the demand for online shopping with a prediction focus remain limited in the literature. This paper differs from prior work and leverages two recent releases of the U.S. National Household Travel Survey (NHTS) data for 2009 and 2017 to develop machine learning (ML) models, specifically gradient boosting machine (GBM), for predicting household-level online shopping purchases. The NHTS data allow for not only conducting nationwide investigation but also at the level of households, which is more appropriate than at the individual level given the connected consumption and shopping needs of members in a household. We follow a systematic procedure for model development including employing Recursive Feature Elimination algorithm to select input variables (features) in order to reduce the risk of model overfitting and increase model explainability. Among several ML models, GBM is found to yield the best prediction accuracy. Extensive post-modeling investigation is conducted in a comparative manner between 2009 and 2017, including quantifying the importance of each input variable in predicting online shopping demand, and characterizing value-dependent relationships between demand and the input variables. In doing so, two latest advances in machine learning techniques, namely Shapley value-based feature importance and Accumulated Local Effects plots, are adopted to overcome inherent drawbacks of the popular techniques in current ML modeling. The modeling and investigation are performed at the national level, with a number of findings obtained. The models developed and insights gained can be used for online shopping-related freight demand generation and may also be considered for evaluating the potential impact of relevant policies on online shopping demand.
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http://dx.doi.org/10.1007/s11116-021-10250-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8637526PMC
December 2021

GC-IMS and olfactometry analysis on the tea aroma of Yingde black teas harvested in different seasons.

Food Res Int 2021 12 25;150(Pt A):110784. Epub 2021 Oct 25.

Sericultural & Argi-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, No. 133 Yiheng Street, Dongguanzhuang Road, Tianhe District, Guangzhou 510610, China.

This study aims to investigate the influence of different harvesting seasons on the aroma of black tea and the trend in the tea aroma variation. A total of 68 volatile substances was identified by gas chromatography coupled with ion-mobility spectrometry (GC-IMS), and 20 characteristic aroma-active compounds were quantitatively analyzed by gas chromatography-olfactometry coupled with aroma extract dilution analysis (GC-O AEDA) and odor activity value (OAV) analysis. These aroma-active compounds are mainly linalool, β-damascenone, and benzeneacetaldehyde. Both methods confirmed that the aroma of tea changes with the harvesting seasons, showing a downward trend followed by an upward trend. Besides, black teas harvested in different seasons have their characteristic volatile compounds and metabolism precursors. The degradation of glycosides, carotenes, and amino acids are the most important degradation pathways for the formation of tea aroma. The PLSR results of GC-O-AEDA, OAV, and DSA data agree with each other, showing that five aroma attributes of the autumn tea have strong correlations. The autumn tea has the richest aroma, followed by the spring tea and the summer tea.
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http://dx.doi.org/10.1016/j.foodres.2021.110784DOI Listing
December 2021

Function and transcriptional regulation of TCTN1 in oral squamous cell carcinoma.

Oncol Rep 2022 02 3;47(2). Epub 2021 Dec 3.

Department of Stomatology and Key Laboratory of Precision Biomedicine (Liaocheng), Liaocheng People's Hospital, Medical College of Liaocheng University, Liaocheng, Shandong 252000, P.R. China.

Oral squamous cell carcinoma (OSCC) is one of the most common types of head and neck squamous cell carcinoma (HNSCC) with a poor survival rate. In the present study, the involvement of tectonic 1 (TCTN1) in OSCC was explored. The relevance between TCTN1 and HNSCC clinicopathological features was first analyzed and it was revealed that TCTN1 was associated with the tumor clinical stage and grade. In experiments, it was demonstrated that the proliferative, migratory and invasive capacity of OSCC CAL27 cells and SCC15 cells was significantly suppressed due to TCTN1 knockdown. Additionally, the core promoter of TCTN1 was confirmed and transcription factor AP‑2 alpha (TFAP2A) was suggested as a regulator of TCTN1 mRNA expression. On the whole, the present study elucidated the direct association between TCTN1 and OSCC for the first time, to the best of our knowledge, and the TFAP2A/TCTN1 axis was suggested as a potential novel therapeutic target for OSCC.
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http://dx.doi.org/10.3892/or.2021.8237DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8674709PMC
February 2022

A synergy between the push-pull electronic effect and twisted conformation for high-contrast mechanochromic AIEgens.

Mater Horiz 2021 Feb 15;8(2):630-638. Epub 2020 Dec 15.

AIE Research Center, Shaanxi Key Laboratory of Phytochemistry, College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China.

Mechanochromic (MC) luminogens in response to external stimulus have shown promising applications as pressure sensors and memory devices. Meanwhile, research on their underlying mechanism is still in the initial stage. Here, three pyridinium-functionalized tetraphenylethylenes bearing n-pentyloxy, hydrogen and nitro groups, namely TPE-OP, TPE-H and TPE-NO, are designed to systematically investigate the influence of the push-pull electronic effect and molecular conformation on MC luminescence. Upon anisotropic grinding and isotropic hydrostatic compression, TPE-OP with strong intramolecular charge transfer (ICT) affords the best MC behavior among them. Analysis of three polymorphs of TPE-H clearly indicates that planarization of the molecular conformation plays an important role in their bathochromic shifts under mechanical stimuli. Theoretical calculations also verify that high twisting stress of AIEgens can be released under high pressure. This study presents a mechanistic insight into MC behaviour and an effective strategy to achieve high-contrast MC luminescence.
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http://dx.doi.org/10.1039/d0mh01251cDOI Listing
February 2021

Self-trapped exciton emission and piezochromism in conventional 3D lead bromide perovskite nanocrystals under high pressure.

Chem Sci 2021 Nov 21;12(44):14711-14717. Epub 2021 Oct 21.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China

Developing single-component materials with bright-white emission is required for energy-saving applications. Self-trapped exciton (STE) emission is regarded as a robust way to generate intrinsic white light in halide perovskites. However, STE emission usually occurs in low-dimensional perovskites whereby a lower level of structural connectivity reduces the conductivity. Enabling conventional three-dimensional (3D) perovskites to produce STEs to elicit competitive white emission is challenging. Here, we first achieved STEs-related emission of white light with outstanding chromaticity coordinates of (0.330, 0.325) in typical 3D perovskites, Mn-doped CsPbBr nanocrystals (NCs), through pressure processing. Remarkable piezochromism from red to blue was also realized in compressed Mn-doped CsPbBr NCs. Doping engineering by size-mismatched Mn dopants could give rise to the formation of localized carriers. Hence, high pressure could further induce octahedra distortion to accommodate the STEs, which has never occurred in pure 3D perovskites. Our study not only offers deep insights into the photophysical nature of perovskites, it also provides a promising strategy towards high-quality, stable white-light emission.
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http://dx.doi.org/10.1039/d1sc04987aDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8597834PMC
November 2021

Recovery and virulence factors of sublethally injured Staphylococcus aureus after ohmic heating.

Food Microbiol 2022 Apr 13;102:103899. Epub 2021 Sep 13.

College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing, 100083, PR China; Beijing Higher Institution Engineering Research Center of Animal Product, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing, 100083, PR China. Electronic address:

Ohmic heating (OH) is an alternative thermal processing technique, which is widely used to pasteurize or sterilize food. However, sublethally injured Staphylococcus aureus induced by OH is a great concern to food safety. The recovery of injured S. aureus by OH and virulence factor changes during recovery were investigated in this study. The liquid media (phosphate-buffered saline, buffered peptone water and nutrient broth (NB)), temperature (4, 25 and 37 °C) and pH (6.0, 7.2 and 8.0) influenced the recovery rate and the injured cells completely repaired in NB at 37 °C, pH 7.2 with the shortest time of 2 h. The biofilm formation ability, mannitol fermentation, hemolysis, and coagulase activities decreased in injured S. aureus and recovered during repair process. Quantitative real-time PCR showed the expression of sek, clfB and lukH involved in virulence factors increased during recovery. The results indicated that the virulence factors of injured S. aureus recovered after repair.
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http://dx.doi.org/10.1016/j.fm.2021.103899DOI Listing
April 2022

Achieving Ultralow Lattice Thermal Conductivity and High Thermoelectric Performance in GeTe Alloys via Introducing CuTe Nanocrystals and Resonant Level Doping.

ACS Nano 2021 Dec 4;15(12):19345-19356. Epub 2021 Nov 4.

MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

The binary compound of GeTe emerging as a potential medium-temperature thermoelectric material has drawn a great deal of attention. Here, we achieve ultralow lattice thermal conductivity and high thermoelectric performance in In and a heavy content of Cu codoped GeTe thermoelectrics. In dopants improve the density of state near the surface of Femi of GeTe by introducing resonant levels, producing a sharp increase of the Seebeck coefficient. In and Cu codoping not only optimizes carrier concentration but also substantially increases carrier mobility to a high value of 87 cm V s due to the diminution of Ge vacancies. The enhanced Seebeck coefficient coupled with dramatically enhanced carrier mobility results in significant enhancement of PF in GeInCuTe series. Moreover, we introduce CuTe nanocrystals' secondary phase into GeTe by alloying a heavy content of Cu. CuTe nanocrystals and a high density of dislocations cause strong phonon scattering, significantly diminishing lattice thermal conductivity. The lattice thermal conductivity reduced as low as 0.31 W m K at 823 K, which is not only lower than the amorphous limit of GeTe but also competitive with those of thermoelectric materials with strong lattice anharmonicity or complex crystal structures. Consequently, a high of 2.0 was achieved for GeInCuTe by decoupling electron and phonon transport of GeTe. This work highlights the importance of phonon engineering in advancing high-performance GeTe thermoelectrics.
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http://dx.doi.org/10.1021/acsnano.1c05650DOI Listing
December 2021

Acetylation inhibition alleviates energy metabolism in muscles of minipigs varying with the type of muscle fibers.

Meat Sci 2022 Feb 19;184:108699. Epub 2021 Oct 19.

Key Laboratory of Meat Processing and Quality Control, MOE; Key Laboratory of Meat Processing, MARA, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control; Nanjing Agricultural University, Nanjing 210095, PR China. Electronic address:

In this study, we investigated whether preslaughter chemical-induced acetylation affected postmortem energy metabolism and pork quality. Thirty pigs were randomly assigned to control, acetyltransferase inhibitor (ATi) or deacetyltransferase inhibitor treatments. Serum, trapezius, longissimus lumborum, psoas major, semimembranosus and semitendinosus muscles were taken for analyses. The results indicated that ATi treatment significantly reduced the activities of lactate dehydrogenase and creatine kinase and heat shock protein 70 in serum (P < 0.05). ATi treatment increased ATP and glycogen content, but decreased lactic acid content in trapezius, psoas major and semitendinosus muscles (P < 0.05). A total of 13 acetylated proteins bands were identified and the deacetylation of creatine kinase may play a key role in slowing down the postmortem energy metabolism in ATi-treated group. In addition, ATi treatment reduced the rate of postmortem glycolysis in muscles with higher oxidative but lower glycolytic fibers. These findings provide a new insight into the underlying mechanism on muscle-specific postmortem changes of pork quality.
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http://dx.doi.org/10.1016/j.meatsci.2021.108699DOI Listing
February 2022

Correction to 'DrugCombDB: a comprehensive database of drug combinations toward the discovery of combinatorial therapy'.

Nucleic Acids Res 2021 Oct;49(18):10801-10802

School of Computer Science and Engineering, Central South University, Changsha 410075, China.

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http://dx.doi.org/10.1093/nar/gkab836DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8501989PMC
October 2021

Pressure-Driven Reverse Intersystem Crossing: New Path toward Bright Deep-Blue Emission of Lead-Free Halide Double Perovskites.

J Am Chem Soc 2021 Sep 10;143(37):15176-15184. Epub 2021 Sep 10.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.

Maximizing the regeneration of singlet excitons remains a considerable challenge in deep-blue emission systems to obtain low-cost, high-efficiency fluorescent materials. However, the formation of the long-lifetime triplet excitons generally dominates the radiative process, making it greatly difficult to harvest deep-blue emission with high color purity because of the depression of singlet excitons. Here, a very bright deep-blue emission in double perovskite CsNaAgInCl alloyed with Bi doping (CNAICB) was successfully achieved by pressure-driven reverse intersystem crossing (RISC), an abnormal photophysical process of energy transfer from the excited triplet state back to the singlet. Therein, the inherently broad emission of CNAICB was associated with the self-trapped excitons (STEs) at excited triplet states, whereas the radiative recombination of STEs populated in excited singlet states was responsible for the observed deep-blue emission. Moreover, the deep-blue emission corresponds to Commission Internationale de L'Eclairage (CIE) coordinates (0.16, 0.06) at 5.01 GPa, which meets the requirement of Rec. 2020 display standards. Likewise, pressure was introduced as an efficient tool to rule out the possibility of the recombination of free excitons and clarify the long-standing conventional dispute over the origin of the low-wavelength emission of CsAgInCl. Our study not only demonstrates that pressure can be a robust means to boost the deep-blue emission but also provides deep insights into the structure-property relationship of lead-free CNAICB double perovskites.
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http://dx.doi.org/10.1021/jacs.1c06207DOI Listing
September 2021

The Clinical Value of 3D Ultrasonic Measurement of the Ratio of Gestational Sac Volume to Embryo Volume in IoT-Based Prediction of Pregnancy Outcome.

J Healthc Eng 2021 24;2021:6421025. Epub 2021 Aug 24.

Arba Minch Institute of Technology, Arba Minch University, Ethiopia.

The objective of the research study is to investigate the use of three-dimensional ultrasonic measurement technology, to determine the size of gestational sac and embryo volume, and to use the ratio of gestational sac volume to embryo volume in IoT-based prediction of pregnancy outcome. The abnormal and normal pregnancy identifiers are there, which assists in prediction of pregnancy outcomes: whether the pregnancy is normal or may suffer pregnancy loss during first trimester. For the observational study, 500 singleton pregnant women who made an appointment for delivery in Qiqihar Hospital from January 2015 to June 2019 were considered. The 500 pregnant women received transvaginal ultrasound at 6 ∼ 8 weeks of gestational age to measure gestational sac volume (GSV), yolk sac volume (YSV), and germ volume (GV). According to pregnancy outcome, they were divided into fine group ( = 435) and abortion group ( = 65). Among the 500 cases, 435 had normal delivery and 65 had abortions. According to the results of gestational age (GA) analysis, the pregnancy success rates at 6 ( = 268), 7 ( = 184), and 8 weeks ( = 48) were 85.8%, 87.5%, and 91.7%, respectively. Comparison of pregnancy failure rate among the three groups shows statistically significant difference. The morphology of germ, yolk sac, and gestational sac cannot be used as a predictor of pregnancy outcome in various degrees. The results of multivariate Cox proportional regression analysis show the following: the ratio of germ volume (GV) to gestational sac volume (GSV) (=0.008) has an impact on the prediction of spontaneous abortion prognosis, showing statistically significant difference; yolk sac volume (YSV), germ volume (GV), and gestational sac volume (GSV) have no effect on the prediction of spontaneous abortion prognosis ( > 0.05). The ratio of GSV to germ volume has a strong prognostic value for pregnancy results. To a certain extent, the ratio of gestational sac volume to germ volume can predict spontaneous pregnancy abortion at 6th week of gestation, providing a theoretical basis for clinical ultrasound pregnancy examination indicators.
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http://dx.doi.org/10.1155/2021/6421025DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8410420PMC
August 2021

Harvesting High-Quality White-Light Emitting and Remarkable Emission Enhancement in One-Dimensional Halide Perovskites Upon Compression.

JACS Au 2021 Apr 2;1(4):459-466. Epub 2021 Mar 2.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.

The pressure induced emission (PIE) behavior of halide perovskites has attracted extensive interest due to its potential application in pressure sensors and trademark security. However, the PIE phenomenon of white-light-emitting hybrid perovskites (WHPs) is rare, and that at pressures above 10.0 GPa has never been reported. Here, we effectively adjusted the perovskite to emit high-quality "cold" or "warm" white light and successfully realized pressure-induced emission (PIE) upon even higher pressure up to 35.1 GPa in one-dimensional halide perovskite CNHPbCl. We reveal that the degree of structural distortion and the rearrangement of the multiple self-trapped states position are consistent with the intriguing photoluminescence variation, which is further supported by high-pressure synchrotron X-ray diffraction experiments and time-resolved photoluminescence decay dynamics data. The underlying relationship between octahedron behavior and emission plays a key role to obtain high-quality white emission perovskites. We anticipate that this work enhances our understanding of structure-dependent self-trapped exciton (STE) emission characteristics and stimulates the design of high-performance WHPs for next generation white LED lighting devices.
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http://dx.doi.org/10.1021/jacsau.1c00024DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8395689PMC
April 2021

Unambiguous determination of crystal orientation in black phosphorus by angle-resolved polarized Raman spectroscopy.

Nanoscale Horiz 2021 Sep 27;6(10):809-818. Epub 2021 Sep 27.

School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen, 518055, China.

Angle-resolved polarized Raman spectroscopy (ARPRS) is widely used to determine the crystal orientations of anisotropic layered materials (ALMs), which is an essential step to study all of their anisotropic properties. However, the understanding of the ARPRS response of black phosphorous (BP) as a most widely studied ALM is still unsatisfactory. Here, we clarify two key controversies about the physical origin of the intricate ARPRS response and the determination of crystal orientations in BP. Through systematic ARPRS measurements, we show that the degree of anisotropy of the response evolves gradually and periodically with the BP thickness, eventually leading to the intricate response. Meanwhile, we find that using the Raman peak intensity ratio of the two A phonon modes, the crystal orientations of BP can be unambiguously distinguished a concise inequality . Comprehensive analysis and first-principles calculations reveal that the external anisotropic interference effect and the intrinsic electron-phonon coupling are responsible for the observations.
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http://dx.doi.org/10.1039/d1nh00220aDOI Listing
September 2021

The Influence of Filler Size and Crosslinking Degree of Polymers on Mullins Effect in Filled NR/BR Composites.

Polymers (Basel) 2021 Jul 12;13(14). Epub 2021 Jul 12.

College of Chemistry, Jilin University, Changchun 130012, China.

Two factors, the crosslinking degree of the matrix () and the size of the filler (), have significant impact on the Mullins effect of filled elastomers. Herein, the result. of the two factors on Mullins effect is systematically investigated by adjusting the crosslinking degree of the matrix via adding maleic anhydride into a rubber matrix and controlling the particle size of the filler via ball milling. The dissipation ratios (the ratio of energy dissipation to input strain energy) of different filled natural rubber/butadiene rubber (NR/BR) elastomer composites are evaluated as a function of the maximum strain in cyclic loading (). The dissipation ratios show a linear relationship with the increase of within the test range, and they depend on the composite composition ( and ). With the increase of , the dissipation ratios decrease with similar slope, and this is compared with the dissipation ratios increase which more steeply with the increase in . This is further confirmed through a simulation that composites with larger particle size show a higher strain energy density when the strain level increases from 25% to 35%. The characteristic dependence of the dissipation ratios on and is expected to reflect the Mullins effect with mathematical expression to improve engineering performance or prevent failure of rubber products.
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http://dx.doi.org/10.3390/polym13142284DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8309370PMC
July 2021

Robust Yellow-Violet Pigments Tuned by Site-Selective Manganese Chromophores.

Inorg Chem 2021 Aug 14;60(15):11579-11590. Epub 2021 Jul 14.

Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.

The rational design of multifunctional inorganic pigments relies on the manipulation of ionic valence and local surroundings of a chromophore in structurally and chemically habitable hosts. To date, the development of environmentally benign and intense violet/purple pigments is still a challenge. Here we report a family of MnTeO and MnLiTeO ( = Zn, Mg; = 0.01-0.15) pigments colored by site-selective MnO yellow and MnO violet chromophores. ZnMnTeO is intense bright yellow, comparable with commercial BiVO, and has better near-infrared reflectivity (∼89%) in comparison to commercial TiO. The codoped Li "activator" generates holes and charge-balanced Mn (MnO), realizing a color transformation from yellow to the bright violet pigments of MnLiTeO. The most vivid MgMnLiTeO is probably the best violet pigment known to date, exhibits excellent chemical and thermodynamic stability, and demonstrates pressure-dependent stability up to 5-7 GPa, before a (reversible) phase transition to pink. Theoretical calculations revealed the correlation between site-preference occupancy and chromophore motifs and predicted a wide color gamut of pigments in ZnTeO-hosted 3 transition-metal ions other than manganese.
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http://dx.doi.org/10.1021/acs.inorgchem.1c01568DOI Listing
August 2021

Realization of Distinct Mechano- and Piezochromic Behaviors Alkoxy Chain Length-Modulated Phosphorescent Properties and Multidimensional Self-Assembly Structures of Dinuclear Platinum(II) Complexes.

J Am Chem Soc 2021 Jul 7;143(28):10659-10667. Epub 2021 Jul 7.

Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.

In this work, through the introduction of different lengths of alkoxy chains to the dinuclear cyclometalated platinum(II) complexes, the apparent color, solubility, luminescence properties, and self-assembly behaviors have been remarkably modulated. In the solid state, the luminescence properties have been found to arise from emission origins that switch between the MMLCT excited state in the red solids and the IL excited state in the yellow state, depending on the alkoxy chain lengths. The luminescence of the yellow solids is found to show obvious bathochromic shifts under mechanical grinding and decreased intensity under controllable hydrostatic pressure. However, the emission of the red solids exhibits both a bathochromic shift and reduced intensity due to the isotropic compression-induced shortening of the Pt···Pt and π-π distances. By combining the data obtained from X-ray diffraction (XRD), infrared (IR), and X-ray single crystal structure, a better understanding of the relationship between molecular aggregation and photophysical properties has been realized, suggesting that the length of the alkoxy chains plays an important role in governing the supramolecular assemblies.
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http://dx.doi.org/10.1021/jacs.1c04200DOI Listing
July 2021

Pressure-induced phosphorescence enhancement and piezochromism of a carbazole-based cyclic trinuclear Cu(i) complex.

Chem Sci 2021 Jan 28;12(12):4425-4431. Epub 2021 Jan 28.

College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University Guangzhou Guangdong 510632 People's Republic of China

Interest in piezochromic luminescence has increased in recent decades, even though it is mostly limited to pure organic compounds and fluorescence. In this work, a CuPz (, Pz: pyrazolate) cyclic trinuclear complex (CTC) with two different crystalline polymorphs, namely and , was synthesized. The CTC consists of two functional moieties: carbazole () chromophore and units. In crystals of , discrete --- stacking was found, showing abnormal pressure-induced phosphorescence enhancement (PIPE), which was 12 times stronger at 2.23 GPa compared to under ambient conditions. This novel observation is ascribed to cooperation between heavy-atom effects (, from Cu atoms) and metal-ligand charge-transfer promotion. The infinite π-π stacking of motifs was observed in and it exhibited good piezochromism as the pressure increased. This work demonstrates a new concept in the design of piezochromic materials to achieve PIPE combining organic chromophores and metal-organic phosphorescence emitters.
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http://dx.doi.org/10.1039/d0sc07058kDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8179561PMC
January 2021

Harvesting Cool Daylight in Hybrid Organic-Inorganic Halides Microtubules through the Reservation of Pressure-Induced Emission.

Adv Mater 2021 Aug 21;33(31):e2100323. Epub 2021 Jun 21.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.

Pressure-induced emission (PIE) is extensively studied in halide perovskites or derivative hybrid halides. However, owing to the soft inorganic lattice of these materials, the intense emission is barely retained under ambient conditions, thus largely limiting their practical applications in optoelectronics at atmospheric pressure. Here, remarkably enhanced emission in microtubules of the 0D hybrid halide (C H N ) ZnBr ((4AMP) ZnBr ) is successfully achieved by means of pressure treatment at room temperature. Notably, the emission, which is over ten times more intense than the emission in the initial state, is retained under ambient conditions upon the complete release of pressure. Furthermore, the pressure processing enables the tuning of "sky blue light" before compression to "cool daylight" with a remarkable quantum yield of 88.52% after decompression, which is of considerable interest for applications in next-generation lighting and displays. The irreversible electronic structural transition, induced by the steric hindrance with respect to complexly configurational organic molecules [4AMP], is highly responsible for the eventual retention of PIE and tuning of the color temperature. The findings represent a significant step toward the capture of PIE under ambient conditions, thus facilitating its potential solid-state lighting applications.
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http://dx.doi.org/10.1002/adma.202100323DOI Listing
August 2021

Deep-red fluorescence from isolated dimers: a highly bright excimer and imaging .

Chem Sci 2020 May 25;11(23):6020-6025. Epub 2020 May 25.

School of Engineering, HuZhou University, Huzhou Cent Hosp 759 Erhuan Rd Huzhou Zhejiang P. R. China

Restricted by the energy-gap law, the development of bright near-infrared (near-IR) fluorescent luminophors in the solid state remains a challenge. Herein, we report a new design strategy for realizing high brightness and deep-red/near-IR-emissive organic molecules based on the incorporation of a hybridized local and charge-transfer (HLCT) state and separated dimeric stacks into one aggregate. Experimental and theoretical analyses show that this combination not only contributes to high photoluminescent quantum yields (PLQYs) but also significantly lessens the energy gap. The fluorophore exhibits excellent fluorescence performance, achieving a PLQY of 54.8% for the fluorescence peak at 690 nm, which is among the highest reported for near-IR fluorescent excimers. In addition, because of its bioimaging performance, the designed luminophor has potential for use as a deep-red fluorescent probe for biomedical applications. This research opens the door for developing deep-red/near-IR emissive materials with high PLQYs.
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http://dx.doi.org/10.1039/d0sc01873bDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8159302PMC
May 2020

New-phase retention in colloidal core/shell nanocrystals pressure-modulated phase engineering.

Chem Sci 2021 Apr 2;12(19):6580-6587. Epub 2021 Apr 2.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130012 China

Core/shell nanocrystals (NCs) integrate collaborative functionalization that would trigger advanced properties, such as high energy conversion efficiency, nonblinking emission, and spin-orbit coupling. Such prospects are highly correlated with the crystal structure of individual constituents. However, it is challenging to achieve novel phases in core/shell NCs, generally non-existing in bulk counterparts. Here, we present a fast and clean high-pressure approach to fabricate heterostructured core/shell MnSe/MnS NCs with a new phase that does not occur in their bulk counterparts. We determine the new phase as an orthorhombic MnP structure (B31 phase), with close-packed zigzagged arrangements within unit cells. Encapsulation of the solid MnSe nanorod with an MnS shell allows us to identify two separate phase transitions with recognizable diffraction patterns under high pressure, where the heterointerface effect regulates the wurtzite → rocksalt → B31 phase transitions of the core. First-principles calculations indicate that the B31 phase is thermodynamically stable under high pressure and can survive under ambient conditions owing to the synergistic effect of subtle enthalpy differences and large surface energy in nanomaterials. The ability to retain the new phase may open up the opportunity for future manipulation of electronic and magnetic properties in heterostructured nanostructures.
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http://dx.doi.org/10.1039/d1sc00498kDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8133026PMC
April 2021

Pressure-Triggered Blue Emission of Zero-Dimensional Organic Bismuth Bromide Perovskite.

Adv Sci (Weinh) 2021 May 15;8(9):2004853. Epub 2021 Feb 15.

Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450001 P. R. China.

Understanding the structure-property relationships in Zero-dimensional (0D) organic-inorganic metal halide perovskites (s) is essential for their use in optoelectronic applications. Moreover, increasing the emission intensity, particularly for blue emission, is considerably a challenge. Here, intriguing pressure-induced emission () is successfully achieved from an initially nonluminous 0D [(CHNH)BiBr]Br·CHCN ( ) upon compression. The emission intensity increases significantly, even reaching high-efficiency blue luminescence, as the external pressure is increased to 4.9 GPa. Analyses of the high-pressure experiments and first-principle calculations indicate that the observed PIE can be attributed to the enhanced exciton binding energy associated with [BiBr] octahedron distortion under pressure. This study of sheds light on the relationship between the structure and optical properties of s. The results may improve potential applications of such materials in the fields of pressure sensing and trademark security.
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http://dx.doi.org/10.1002/advs.202004853DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8097370PMC
May 2021

Ectopic tooth in maxillary sinus compressing the nasolacrimal canal: A case report.

Medicine (Baltimore) 2021 May;100(18):e25514

Department of Stomatology.

Rationale: Ectopic tooth is tooth erupting out of normal anatomical position. Ectopic tooth can occur in different positions, such as maxillary sinus and nasal cavity. In this article, we present a rare case of an ectopic tooth with a dentigerous cyst in the maxillary sinus compressing the nasolacrimal canal.

Patient Concerns: An 8-year-old girl presented with a 2-month history of spontaneous lacrimation in her right eye. When she wept, more tear shed from her right eye than that from the left one. Computed tomographic (CT) imaging showed a huge low-density image containing a tooth in the maxillary sinus in her right maxilla; the right nasolacrimal canal vanished due to the compression of the ectopic tooth.

Diagnoses: Ectopic tooth with dentigerous cyst of right maxilla, and obstruction of nasolacrimal duct.

Interventions: The patient underwent nasal endoscopic maxillary sinus cystectomy.

Outcomes: The patient recovered well after cystectomy and has been symptom-free.

Lessons: The unique finding is that this is the first report about ectopic tooth compressing the nasolacrimal canal and inducing spontaneous lacrimation. Treatment: aspect: surgery under endoscope is a minimally invasive approach to ectopic tooth.
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http://dx.doi.org/10.1097/MD.0000000000025514DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8104135PMC
May 2021

Gentiopicroside ameliorates ovalbumin-induced airway inflammation in a mouse model of allergic asthma via regulating SIRT1/NF-κB signaling pathway.

Pulm Pharmacol Ther 2021 06 19;68:102034. Epub 2021 Apr 19.

Institute of Respiratory Diseases, The First Hospital of China Medical University, Shenyang City, Liaoning Province, People's Republic of China. Electronic address:

Allergic asthma is a common airway inflammatory disorder with increasing morbidity and mortality worldwide. Gentiopicroside (GPS) is a secoiridoid glycoside compound that exhibits anti-inflammatory property. However, the effect of GPS on allergic asthma has not been reported yet. In this study, we investigated the role of GPS in a mouse model of ovalbumin (OVA)-induced allergic asthma and explored its potential mechanism. Mice were sensitized with OVA and gavaged with 20, 40, or 80 mg/kg GPS. Administration of GPS decreased lung wet-to-dry weight ratio. Histological analysis of H&E and PAS staining showed that GPS treatment alleviated inflammatory cell infiltration and goblet cell hyperplasia in lung tissue of OVA-sensitized mice. Moreover, GPS inhibited the recruitment of inflammatory cells including total cells, macrophages, eosinophils, lymphocytes and neutrophils and the secretion of T helper type 2 (Th2) cytokines (interleukin (IL)-4, IL-5 and IL-13) in bronchoalveolar lavage fluid (BALF) of OVA-sensitized mice in a dose dependent manner. The levels of OVA-specific immunoglobulin E (IgE) and pro-inflammatory tumor necrosis factor (TNF)-α were also attenuated by GPS treatment. Interestingly, GPS upregulated the expression of silent information regulator 1 (SIRT1) while downregulated the expression of acetyl-nuclear factor kappa B (NF-κB) p65 in lung tissue of OVA-sensitized mice. Furthermore, treatment with an SIRT1 inhibitor (EX-527) partially abolished the inhibitory effect of GPS on OVA-induced airway inflammation, suggesting that the anti-inflammation of GPS might be achieved through regulating SIRT1/NF-κB p65 signaling pathway. These findings indicate that GPS might be a novel drug candidate in the treatment of allergic asthma.
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http://dx.doi.org/10.1016/j.pupt.2021.102034DOI Listing
June 2021

Influence of induction cooking on the flavor of fat cover of braised pork belly.

J Food Sci 2021 May 21;86(5):1997-2010. Epub 2021 Apr 21.

Key Laboratory of Meat Processing and Quality Control, MOE, Nanjing Agricultural University, Nanjing, P.R. China.

Fat has a great impact on texture and flavor of meat products, which is influenced by cooking methods. In this study, the profiles of fatty acids, volatile compounds, and texture of fat cover of braised pork belly were investigated after plane and concave induction cooking. The results showed that cooking time showed a great impact on fat content, textural properties, fatty acids composition, lipid oxidation, and volatile compounds of fat cover (p < 0.05). When cooking time was fixed, concave induction cooking caused lower hardness, chewiness, and saturated fatty acids but higher polyunsaturated fatty acids at 60 min than plane induction cooking. Electronic nose and GC-MS analyses showed that concave induction cooking had a greater impact on flavor of pork belly fat and produced a comparable flavor to plane induction cooked samples in a shorter time. Sensory evaluation showed that concave induction cooking had higher scores at 60 min. Thus, concave induction cooking could be a more efficient method for meat processing. PRACTICAL APPLICATION: Electromagnetic induction heating is an effective cooking technique. It is characterized by uniformity, efficiency, and safety of heating. The application of electromagnetic induction heating technology to the cooking of braised pork was studied, which provides information for further optimizing the cooking technology of braised pork and improving the quality of braised pork.
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http://dx.doi.org/10.1111/1750-3841.15710DOI Listing
May 2021

Controlled Growth of Large-Sized and Phase-Selectivity 2D GaTe Crystals.

Small 2021 May 19;17(21):e2007909. Epub 2021 Apr 19.

School of Materials Science and Engineering, Nanyang Technological University (NTU), Singapore, 639798.

GaTe has recently attracted significant interest due to its direct bandgap and unique phase structure, which makes it a good candidate for optoelectronics. However, the controllable growth of large-sized monolayer and few-layer GaTe with tunable phase structures remains a great challenge. Here the controlled growth of large-sized GaTe with high quality, chemical uniformity, and good reproducibility is achieved through liquid-metal-assisted chemical vapor deposition method. By using liquid Ga, the rapid growth of 2D GaTe flakes with high phase-selectivity can be obtained due to its reduced reaction temperature. In addition, the method is used to synthesize many Ga-based 2D materials and their alloys, showing good universality. Raman spectra suggest that the as-grown GaTe own a relatively weak van der Waals interaction, where monoclinic GaTe displays highly-anisotropic optical properties. Furthermore, a p-n junction photodetector is fabricated using GaTe as a p-type semiconductor and 2D MoSe as a typical n-type semiconductor. The GaTe/MoSe heterostructure photodetector exhibits large photoresponsivity of 671.52 A W and high photo-detectivity of 1.48 × 10 Jones under illumination, owing to the enhanced light absorption and good quality of as-grown GaTe. These results indicate that 2D GaTe is a promising candidate for electronic and photoelectronic devices.
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http://dx.doi.org/10.1002/smll.202007909DOI Listing
May 2021

Judicious use of low-dosage corticosteroids for non-severe COVID-19: A case report.

Open Med (Wars) 2021 19;16(1):440-445. Epub 2021 Mar 19.

Changchun Infectious Diseases Hospital, Changchun, Jilin, China 130123.

Inflammation-mediated lung injury in severe cases of infection with SARS-CoV-2, the aetiological agent of Coronavirus disease 2019 (COVID-19), can lead to respiratory failure and death, and therapies that block or ameliorate lung injury-associated inflammatory "cytokine storms" and progression to acute respiratory distress syndrome (ARDS) are urgently needed. Therapeutic use of corticosteroids for this purpose has been controversial because of conflicting reports on their efficacy and immunosuppressive behaviour. The WHO has strongly recommended treating critical COVID-19 patients with systemic corticosteroid therapy, but recommends against corticosteroid therapy in non-severe COVID-19 disease because of a lack of strong evidence on its efficacy. This retrospective case report describing the successful treatment of a non-severe COVID-19 case in Changchun, China, by judicious administration of corticosteroids using a personalized therapeutic approach was recorded to strengthen the evidence base showing how corticosteroid use in non-severe COVID-19 cases can be safe and efficacious. Alongside supportive care and lopinavir/ritonavir antiviral drugs, a low dosage of methylprednisolone was administered over a short period to attenuate lung inflammation. Regular chest CT scans guided dosage reduction in response to lesion absorption and improved lung condition. Judicious use of corticosteroids safely attenuated disease progression and facilitated rapid and complete recovery.
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http://dx.doi.org/10.1515/med-2021-0250DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7985569PMC
March 2021

Pressure-Induced Emission toward Harvesting Cold White Light from Warm White Light.

Angew Chem Int Ed Engl 2021 Apr 24;60(18):10082-10088. Epub 2021 Mar 24.

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, China.

The pressure-induced emission (PIE) behavior of halide perovskites has attracted widespread attention and has potential application in pressure sensing. However, high-pressure reversibility largely inhibits practical applications. Here, we describe the emission enhancement and non-doping control of the color temperature in two-dimensional perovskite (C H CH CH NH ) PbCl ((PEA) PbCl ) nanocrystals (NCs) through high-pressure processing. A remarkable 5 times PIE was achieved at a mild pressure of 0.4 GPa, which was highly associated with the enhanced radiative recombination of self-trapped excitons. Of particular importance is the retention of the 1.6 times emission of dense (PEA) PbCl NCs upon the complete release of pressure, accompanied by a color change from "warm" (4403 K) to "cold" white light with 14295 K. The irreversible pressure-induced structural amorphization, which facilitates the remaining local distortion of inorganic Pb-Cl octahedra with respect to the steric hindrance of organic PEA cations, should be greatly responsible for the quenched high-efficiency photoluminescence.
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http://dx.doi.org/10.1002/anie.202015395DOI Listing
April 2021

Effects of probiotic litchi juice on immunomodulatory function and gut microbiota in mice.

Food Res Int 2020 11 12;137:109433. Epub 2020 Jun 12.

Sericultural & Argi-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs/Guangdong Key Laboratory of Agricultural Products Processing, No. 133 Yiheng Street., Dongguanzhuang Road, Tianhe District, Guangzhou 510610, China. Electronic address:

Development new functional foods containing probiotics had gained much attention during the past two decades. In this study, probiotic litchi juice was developed, and its effects on immunomodulatory function and gut microbiota were evaluated. Firstly, the litchi juice was fermented with Lactobacillus casei, which increased total phenolic, total flavone, and exopolysaccharide contents of the litchi juice. Hence, the immunomodulatory influence of fermented litchi juice (FL) was investigated in cyclophosphamide-induced mice. The results showed that FL enhanced immune organs indexes (spleen, thymus) and antioxidant capacity, improved the secretions of cytokines (IL-2, IL-6) and immunoglobulins (IgA, IgG, SIgA), and protected the intestinal tract. Finally, the effect of FL on gut microbiota was analyzed by high-throughput sequencing analysis. The changes in the relative abundance of dominant microbe were investigated at phylum and genus levels, respectively. After treatment with FL, the relative abundance of Firmicutes phylum was dramatically increased, as well as the genera of Faecalibaculum, Lactobacillus, and Akkermansia. These findings indicated that probiotic litchi juice could alleviate immune dysfunction and modify gut microbiota structure of mice, which provide a potential functional food to improve the host health.
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http://dx.doi.org/10.1016/j.foodres.2020.109433DOI Listing
November 2020
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