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161. Study of hybrid isocyanate and high‐mono‐hydroxymethyl urea content urea‐formaldehyde resins.

Author

Han, Chenyu, Luo, Zhengmei, Su, Xinlong, Chen, Yanhua, Yang, Zhaojin, Mao, An, Lei, Hong, Zhou, Xiaojian, Wan, Hui, and Du, Guanben

Subjects
UREA-formaldehyde resins, ISOCYANATES, METHYLENE diphenyl diisocyanate, FOURIER transform spectrometers, NUCLEAR magnetic resonance, UREA
Abstract

Based on the difference in the reaction rate of different groups of urea‐formaldehyde resins and isocyanate resins, this study designed two different urea‐formaldehyde resins: a normal urea‐formaldehyde resin (UF) and one with high mono‐hydroxymethylurea content (UF*) to react with polymeric methylene diphenyl diisocyanate (pMDI) resin. The difference in mono‐ and di‐hydroxymethyl urea content between UF and UF* resins was analyzed by nuclear magnetic resonance (NMR) spectroscopy, and results showed that the mono‐hydroxymethyl urea content of the UF* resin was much higher than that of the conventional UF resin. The fourier transform infrared spectrometer (FTIR) analysis of differences between UF* and UF resin showed that the UF* process did not change the main structure of the conventional urea formaldehyde resin. Differential scanning calorimeter (DSC) analysis showed that the curing temperature of the hybrid UF*‐pMDI resin was reduced 27.3°C compared to that of the UF‐pMDI resin. When these hybrid resins were used to bond plywood respectively, test results showed that the UF*‐pMDI resin improved the dry and wet bonding strength by 2.6% and 3.9%, respectively, compared with the UF‐pMDI resin under the condition of hot pressing time (3 min) and temperature (140°C), meeting the requirement of Chinese standard of GB/T 9846–2015 for Class III board. This study provides a new path for further improving the performance and design of hybrid resins based on isocyanate and urea‐formaldehyde resin. [ABSTRACT FROM AUTHOR]

Published
2023
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162. Competition relations between selected microalgae and bloom-forming Ulva prolifera.

Author

Liu, Qing, Cui, Ruifei, Lin, Jianing, Kang, Zhenjun, and Zhou, Xiaojian

Abstract

Large-scale Ulva prolifera green tides have successively occurred for 16 years (2007–2022) in the Yellow Sea (YS), and the different life stages of U. prolifera play critical roles in regulating the occurrence and development of green tides. U. prolifera and microalgae have a similar niche in seawater, but their potential interactions are not yet clearly understood. In this study, we investigated the competition relationship between two microalgae and U. prolifera at five different development stages in controlled laboratory experiments. The results showed that one microalgae Alexandrium tamarense , can only inhibit U. prolifera gametes at the first settlement stage. Inversely, the germinated U. prolifera begin to show negative effects on microalgae in multiple ways at the subsequent four stages, and the growth inhibition rates among these stages ranged from 19 to 100%. The complex interactions may influence the formation of green tides. Meanwhile, the potential ecological consequences on phytoplankton, even the decreased occurrence of microalgal blooms in the YS need to be further evaluated. [ABSTRACT FROM AUTHOR]

Published
2023
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166. Dissection of the genetic variation and candidate genes of lint percentage by a genome-wide association study in upland cotton

Author

He Kunlun, Liu Yangai, Chengxiang Song, Yang Daigang, Zhou Xiaojian, Sun Kuan, Wei Li, Pei Xiaoyu, Zhang Fei, Ren Zhongying, and Ma Xiongfeng

Subjects
0106 biological sciences, Linkage disequilibrium, Candidate gene, Genotype, Quantitative Trait Loci, Population, Single-nucleotide polymorphism, Genome-wide association study, Quantitative trait locus, Biology, Polymorphism, Single Nucleotide, 01 natural sciences, Linkage Disequilibrium, Genetic variation, Genetics, Cotton Fiber, education, Genetic Association Studies, Gossypium, Lint, education.field_of_study, General Medicine, Plant Breeding, Genetics, Population, Phenotype, Agronomy and Crop Science, Genome, Plant, 010606 plant biology & botany, Biotechnology
Abstract

A genome-wide associated study identified six novel QTLs for lint percentage. Two candidate genes underlying this trait were also detected. Increasing lint percentage (LP) is a core goal of cotton breeding. To better understand the genetic basis of LP, a genome-wide association study (GWAS) was conducted using 276 upland cotton accessions planted in multiple environments and genotyped with a CottonSNP63K array. After filtering, 10,660 high-quality single-nucleotide polymorphisms (SNPs) were retained. Population structure, principal component and neighbor-joining phylogenetic tree analyses divided the accessions into two subpopulations. These results along with linkage disequilibrium decay indicated accessions were not highly structured and exhibited weak relatedness. GWAS uncovered 23 polymorphic SNPs and 15 QTLs significantly associated with LP, with six new QTLs identified. Two candidate genes, Gh_D05G0313 and Gh_D05G1124, both contained one significant SNP, highly expressed during ovule and fiber development stages, implying that the two genes may act as the most promising regulators of LP. Furthermore, the phenotypic value of LP was found to be positively correlated with the number of favorable SNP alleles. These favorable alleles for LP identified in the study may be useful for improving lint yield.

Published
2019

171. Role of endogenous melatonin in pathophysiologic and oxidative stress responses to personal air pollutant exposures in asthmatic children

Author

He, Linchen, primary, Norris, Christina, additional, Cui, Xiaoxing, additional, Li, Zhen, additional, Barkjohn, Karoline K., additional, Teng, Yanbo, additional, Fang, Lin, additional, Lin, Lili, additional, Wang, Qian, additional, Zhou, Xiaojian, additional, Hong, Jianguo, additional, Li, Feng, additional, Zhang, Yinping, additional, Schauer, James J., additional, Black, Marilyn, additional, Bergin, Michael H., additional, and Zhang, Junfeng (Jim), additional

Published
2021
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172. Precise theoretical model for quantum-dot color conversion

Author

Xu, Sheng, primary, Yang, Tao, additional, Lin, Jianyao, additional, Shen, Qiongxin, additional, Li, Jinan, additional, Ye, Yuanyuan, additional, Wang, Luanluan, additional, Zhou, Xiaojian, additional, Chen, Enguo, additional, Ye, Yun, additional, and Guo, Tailiang, additional

Published
2021
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174. Preparation and performance of tannin–glyoxal–urea resin-bonded grinding wheel loaded with sio2 reinforcing particles

Author

Zhang, Jun, Liu, Bowen, Zhu, Yunxia, Essawy, Hisham, Li, Jinxin, Chen, Qian, Zhou, Xiaojian, Du, Guanben, Zhang, Jun, Liu, Bowen, Zhu, Yunxia, Essawy, Hisham, Li, Jinxin, Chen, Qian, Zhou, Xiaojian, and Du, Guanben

Abstract

In this study, an easily prepared bio-based abrasive grinding wheel based on tannin–glyoxal–urea (TGU)thermosetting matrix is presented.The synthesised resin was prepared via co-polycondensation reaction of glyoxal and ureawith condensed tannin, which is a forest-derived product. Fourier transform infrared spectroscopy and electrospray ionisation mass spectrometry results confirmed that urea and glyoxal react well under acidic conditions and that –(OH)CH–NH–group is primarily involved in TGU cross-linking. Differential scanning calorimetry, thermomechanical analysis and thermogravimetric analysis investigations showed that the preparation of TGU resin is easier compared to commercial phenol–formaldehyde (PF) resin; moreover, TGU resin has a more robust chemical network structure, which contributes efficiently to heat resistance and improved mechanical properties. This observation is supported by Brinell hardness, compression resistance and grinding testing; these showed that the new grinding wheel acquired higher hardness, superior resistance against compression and stronger abrasion resistance compared with a PF-based grinding wheel prepared in the laboratory. Moreover, few holes and no cracks were found in the new grinding wheel

Published
2021

175. Preparation and performance of tannin–glyoxal–urea resin-bonded grinding wheel loaded with sio2 reinforcing particles

Author

Zhu, Yunxia, Essawy, Hisham, Li, Jinxin, Chen, Qian, Zhou, Xiaojian, Du, Guanben, Zhang, Jun, Liu, Bowen, Zhu, Yunxia, Essawy, Hisham, Li, Jinxin, Chen, Qian, Zhou, Xiaojian, Du, Guanben, Zhang, Jun, and Liu, Bowen

Abstract

In this study, an easily prepared bio-based abrasive grinding wheel based on tannin–glyoxal–urea (TGU)thermosetting matrix is presented.The synthesised resin was prepared via co-polycondensation reaction of glyoxal and ureawith condensed tannin, which is a forest-derived product. Fourier transform infrared spectroscopy and electrospray ionisation mass spectrometry results confirmed that urea and glyoxal react well under acidic conditions and that –(OH)CH–NH–group is primarily involved in TGU cross-linking. Differential scanning calorimetry, thermomechanical analysis and thermogravimetric analysis investigations showed that the preparation of TGU resin is easier compared to commercial phenol–formaldehyde (PF) resin; moreover, TGU resin has a more robust chemical network structure, which contributes efficiently to heat resistance and improved mechanical properties. This observation is supported by Brinell hardness, compression resistance and grinding testing; these showed that the new grinding wheel acquired higher hardness, superior resistance against compression and stronger abrasion resistance compared with a PF-based grinding wheel prepared in the laboratory. Moreover, few holes and no cracks were found in the new grinding wheel

Published
2021

179. Conditional design of the Shewhart X̄chart with unknown process parameters based on median run length

Author

Hu, XueLong, Castagliola, Philippe, Tang, AnAn, and Zhou, XiaoJian

Abstract

Numerous researches have been done on the Shewhart X̄chart based on the average run length (ARL) metric. Since the shape of the run length (RL) distribution changes with the mean shift size, the median run length (MRL) is argued to be a better criterion for evaluating the performance of the Shewhart X̄chart. Moreover, when the process parameters are unknown, the phase 2 properties of the Shewhart X̄chart are conditioned on the parameter estimates arising from different practitioners in phase 1. This variability among the estimated process parameters is usually called as the between-practitioners variability. In order to investigate this variability in the conditional MRLvalues, both the average MRL(AMRL) and the standard deviation of MRL(SDMRL) will be used together in our article. The performance analyses of the MRL-based Shewhart X̄chart are provided. To prevent too many lower in-control MRLvalues than the desired one, an appropriate bootstrap approach is adopted to adjust the control limits, and to further balance the in- and out-of-control MRLvalues of the Shewhart X̄chart. [Submitted: 26 September 2018; Accepted: 15 January 2022]

Published
2023
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182. Preparation and properties of a novel type of tannin-based wood adhesive.

Author

Chen, Xinyi, Pizzi, Antonio, Fredon, Emmanuel, Gerardin, Christine, Li, Jinxing, Zhou, Xiaojian, and Du, Guanben

Subjects
TANNINS, WOOD, ADHESIVES, GLYCERYL ethers, SHEAR strength, HYDROXYL group, THERMAL stability
Abstract

A novel biomass-based wood adhesive was prepared with commercial Mimosa tannin extract and glycerol diglycidyl ether (GDE) by convenient mechanical mixing. GDE served as the crosslinker of the tannin without any aldehyde addition yielding hardened three-dimensional networks. Different weight ratios of tannin/GDE were investigated by a number of techniques to determine their influence on final properties. The results showed that a non-hydrolysable ester bonds can be formed between the epoxy groups of GDE and hydroxyl groups of tannin, this being the critical factor for the good water resistance obtained by the wood adhesives prepared. Moreover, the dry and wet shear strength exhibit positive correlation with the proportion of GDE added. Even at a relatively small proportion of GDE (33% of the weight of dry tannin), the dry and 24 h cold water shear strengths of the bonded plywood satisfied the requirements of relevant standard (GB/T 9846–2015, ≥0.7 MPa). The thermal stability of the tannin-based wood adhesive so prepared progressively improved with the increasing proportion of GDE. [ABSTRACT FROM AUTHOR]

Published
2022
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187. Personal Exposure to PM2.5 Oxidative Potential in Association with Pulmonary Pathophysiologic Outcomes in Children with Asthma

Author

He, Linchen, primary, Norris, Christina, additional, Cui, Xiaoxing, additional, Li, Zhen, additional, Barkjohn, Karoline K., additional, Brehmer, Collin, additional, Teng, Yanbo, additional, Fang, Lin, additional, Lin, Lili, additional, Wang, Qian, additional, Zhou, Xiaojian, additional, Hong, Jianguo, additional, Li, Feng, additional, Zhang, Yinping, additional, Schauer, James J., additional, Black, Marilyn, additional, Bergin, Michael H., additional, and Zhang, Junfeng Jim, additional

Published
2021
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190. Characterization and 3D printability of poly (lactic acid)/acetylated tannin

Author

Liao, Jingjing, Brosse, Nicolas, Pizzi, Antonio, Hoppe, Sandrine, Zhou, Xiaojian, Du, Guanben, Southwest Forestry University (SWFU), Laboratoire d'Etude et de Recherche sur le Matériau Bois (LERMAB), Université de Lorraine (UL), Laboratoire Réactions et Génie des Procédés (LRGP), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL), National Natural Science Foundation of China (NSFC)NSFC 3176018731971595Natural Science Foundation of Yunnan Province2017FB060Yunnan provincial youth and middle-age reserve talents of academic and technical leaders2019HB026China Scholarship Council, and ANR-11-LABX-0002,ARBRE,Recherches Avancées sur l'Arbre et les Ecosytèmes Forestiers(2011)

Subjects
[CHIM.POLY]Chemical Sciences/Polymers, poly (lactic acid), [CHIM.ORGA]Chemical Sciences/Organic chemistry, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, composite, acetylated tannin, degradation, 3D, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; In this study, a three-dimensional (3D) printing filament prepared from 11 poly (lactic acid) (PLA) and acetylated tannin via a twin-screw extruder was reported. 12 The impact of acetylated tannin loading content on the final properties of the 13 resulting composite materials and their 3D printability were investigated. The 14 experimental results indicate that PLA can be compounded with up to 20 wt% 15 acetylated tannin without any obvious deterioration in the tensile property. The 16 resulting composites acquired better degradation rate in aquatic system compared 17 with neat PLA, especially in alkaline medium. Moreover, all composites are printable 18 and showed generally good printing quality with brown color, however, this is 19 limited to temperatures reasonably below 220°C to avoid printing defects, especially 20 at high loadings of acetylated tannin.

Published
2020

191. Characterization and Preparation of Furanic-Glyoxal Foams

Author

Xi, Xuedong, Pizzi, Antonio, Lei, Hong, Du, Guanben, Zhou, Xiaojian, Lin, Yuying, Laboratoire d'Etude et de Recherche sur le Matériau Bois (LERMAB), Université de Lorraine (UL), and Southwest Forestry University (SWFU)

Subjects
lcsh:QD241-441, MALDI-ToF, [SPI]Engineering Sciences [physics], lcsh:Organic chemistry, glyoxal, FTIR, combustion properties, lipids (amino acids, peptides, and proteins), furfuryl alcohol, rigid foams, Article
Abstract

Synthetic foams have become an essential industrial product for a great variety of applications. Furfuryl alcohol, as a biomass chemical, was reacted with glyoxal at room temperature to prepare furanic-glyoxal rigid foams, and p-toluenesulfonic acid was used as a catalyst to initiate the reaction. Foams with different molar ratios (furfuryl alcohol/glyoxal) were prepared in this work, and uniform cells foams have been obtained. Their compression resistance, 24-h water absorption, density, and other basic properties were tested. Scanning electron microscopy (SEM) was used to observe the cellular morphology of the foams prepared, thermogravimetric analysis (TGA) helped to understand their thermal and combustion properties, and FTIR and Matrix Assisted Laser Desorption Ionisation Time of Flight (MALDI ToF) mass spectroscopy to explain the structure of the resulting foams to clarify the reactions occurring during foaming. The results show that the compression resistance of furanic-glyoxal foams declined as the furfuryl alcohol/glyoxal ratio decreases also. SEM observations revealed that foams with open-cell were obtained when furfuryl alcohol was added in greater amounts, and more closed cell structures were formed as the proportion of glyoxal increased. TGA results showed that the initial ignition temperature of furanic-glyoxal foams is ~200 °C higher than that of wood, and the smaller comprehensive combustion index S (about 0.15 × 10−7 (%2 K−3 min−2)) indicates that the foam burns slowly and has poor flammability, that is, it is not easy to burn.

Published
2020

192. Resequencing core accessions of a pedigree identifies derivation of genomic segments and key agronomic trait loci during cotton improvement

Author

Yang Daigang, Zhang Wensheng, He Kunlun, Yuzhou Zhang, Wang Zhenyu, Zhou Kehai, Zhou Xiaojian, Ma Xiongfeng, Wenyu Ma, Junfang Liu, Ren Zhongying, Wei Li, Guanghui Xiao, Pei Xiaoyu, Liu Yangai, and Zhang Fei

Subjects
Crops, Agricultural, 0106 biological sciences, 0301 basic medicine, Linkage disequilibrium, Genotype, Heterosis, lint percentage, Genomics, Plant Science, identity by descent (IBD), Biology, 01 natural sciences, Linkage Disequilibrium, Domestication, 03 medical and health sciences, Research Articles, cotton pedigree, resequencing, Genetics, Molecular breeding, Gossypium, Genetic diversity, Lint, modern cotton improvement, Pedigree, Plant Breeding, Phenotype, 030104 developmental biology, Genetic Loci, Trait, Agronomy and Crop Science, Genome, Plant, Research Article, 010606 plant biology & botany, Biotechnology
Abstract

Summary Upland cotton (Gossypium hirsutum) is the world's largest source of natural fibre and dominates the global textile industry. Hybrid cotton varieties exhibit strong heterosis that confers high fibre yields, yet the genome‐wide effects of artificial selection that have influenced Upland cotton during its breeding history are poorly understood. Here, we resequenced Upland cotton genomes and constructed a variation map of an intact breeding pedigree comprising seven elite and 19 backbone parents. Compared to wild accessions, the 26 pedigree accessions underwent strong artificial selection during domestication that has resulted in reduced genetic diversity but stronger linkage disequilibrium and higher extents of selective sweeps. In contrast to the backbone parents, the elite parents have acquired significantly improved agronomic traits, with an especially pronounced increase in the lint percentage. Notably, identify by descent (IBD) tracking revealed that the elite parents inherited abundant beneficial trait segments and loci from the backbone parents and our combined analyses led to the identification of a core genomic segment which was inherited in the elite lines from the parents Zhong 7263 and Ejing 1 and that was strongly associated with lint percentage. Additionally, SNP correlation analysis of this core segment showed that a non‐synonymous SNP (A‐to‐G) site in a gene encoding the cell wall‐associated receptor‐like kinase 3 (GhWAKL3) protein was highly correlated with increased lint percentage. Our results substantially increase the valuable genomics resources available for future genetic and functional genomics studies of cotton and reveal insights that will facilitate yield increases in the molecular breeding of cotton.

Published
2018

193. Patterns of presence-absence variants in Upland cotton

Author

Zhou Xiaojian, Guanghui Xiao, Ren Zhongying, Wenbo Wang, Haihong Shang, Hongbin Li, Pei Xiaoyu, Lingling Dou, Huaizhu Li, Liu Yangai, Ma Xiongfeng, Junfang Liu, Wenyu Ma, Zhang Fei, Xianliang Zhang, Yang Daigang, Zhang Wensheng, Changsong Zou, Wei Li, and He Kunlun

Subjects
Genetics, Gossypium, business.industry, MEDLINE, Chromosome Mapping, Biology, Genes, Plant, General Biochemistry, Genetics and Molecular Biology, Plant Breeding, Text mining, Genomic Structural Variation, DNA Transposable Elements, Cotton Fiber, Presence absence, General Agricultural and Biological Sciences, business, Genome, Plant, General Environmental Science
Published
2019

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