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An Eco-Friendly Wood Adhesive from Alfalfa Leaf Protein

Journal of Renewable Materials 2020年第11期8卷 1429-1441页

作者： Bengang Zhang xuedong xi Zhigang Wu Hong Lei Lifen Li Meifen Tian College of Forestry Guizhou UniversityGuiyang550025China Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China ENSTIB-LERMAB University of LorraineEpinal88051France

According to the preparation method commonly used for soy proteinαbased adhesives,alfalfa leaf protein was used as the raw material to prepare alfalfa leaf protein-based wood *** scanning calorimetry analyzer(DSC),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTαIR)were used to characterize properties of the alfalfa leaf protein-based adhesive in this *** results revealed the following:(1)Chemical compositions and chemical structures of the alfalfa leaf protein were basically identical with those of the soy protein,both belonging to spherical proteins with the basis and potential for protein adhesives preparation,and spatial cross-linked network structures would be easily formed.(2)Alfalfa leaf protein and soy protein adhesives had the similar curing behaviors,curing temperature of alfalfa leaf protein-based adhesive was relaαtively lower,and the heating rate had minor influence on curing temperature of alfalfa leaf protein-based *** different heating rates,change tendencies of curing reaction degrees of both the two adhesives were not totally the same.(3)Activation energy and reaction frequency factor of the alfalfa leaf protein-based adhesive were higher than those of soy protein-based adhesive,indicating that the curing reaction of the alfalfa leaf protein adhesive was more difficult than soy protein-based adhesive,thus the dry shear strength and water resistance of alfalfa protein-based adhesive were lower than those of soy protein-based *** models of curing reactions of alfalfa leaf protein-based adhesive and soy protein-based adhesive are dα=dt/1.06×10^(13)e^(-97370/RT)(1-α)^(0.938) and dα/dt=1.09×10^(11)e^(-84260/RT) 1-α)^(0.928) *** results of this study will expand the selection of raw materials for protein-based wood adhesives.

关键词： Alfalfa leaf protein wood adhesive curing properties thermal performance

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Soy Protein Isolate Non-Isocyanates Polyurethanes(NIPU)Wood Adhesives

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Journal of Renewable Materials 2021年第6期9卷 1045-1057页

作者： xinyi Chen Antonio Pizzi xuedong xi xiaojian Zhou Emmanuel Fredon Christine Gerardin LERMAB University of LorraineEpinal88000France Yunnan Key Laboratory of Wood Adhesives and Glue Products Southwest Forestry UniversityKunming650224China LERMAB University of LorraineNancy54000France

Soy-protein isolate(SPI)was used to prepare non-isocyanate polyurethane(NIPU)thermosetting adhesives for wood panels by reacting it with dimethyl carbonate(DMC)and hexamethylene *** linear as well as branched oligomers were obtained and identified,indicating how such oligomer structures could further cross-link to form a hardened *** structures were observed,namely carbamic acid-derived urethane linkages coupled with lactam *** curing of the adhesive was followed by thermomechanical analysis(TMA).It appeared to follow a two stages process:First,at a lower temperature(maximum 130℃),the growth of linear oligomers occurred,finally forming a physically entangled *** appeared to collapse and disentangle,causing a decrease of MOE,as the temperature *** appears to be due to the ever more marked Brownian movements of the linear oligomer chains with the increase of the ***,chemical cross-linking of the chains appeared to ensue,forming a hardened *** was shown by the thermomechanical analysis(TMA)showing two distinct MOE maxima peaks,one around 130℃ and the other around 220℃,with a very marked MOE decrease between the *** panels were prepared and bonded with the SPI-NIPU wood adhesive and the results obtained are *** adhesive appeared to pass comfortably the requirements for dry strength of relevant standards,showing to be suitable for interior grade plywood *** did not pass the requirements for wet ***,addition of 15%of glycerol diglycidyl ether improved the wet tests results but still not enough to satisfy the standards requirements.

关键词： Bio-based wood adhesives soy protein isolate non-isocyanate polyurethanes(NIPU) wood panels MALDI ToF

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Plasma Treatment Induced Chemical Changes of Alkali Lignin to Enhance the Performances of Lignin-Phenol-Formaldehyde Resin Adhesive

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Journal of Renewable Materials 2021年第11期9卷 1959-1972页

作者： Zhigang Wu Sicheng Chen Jiankun Liang Lifen Li xuedong xi Xue Deng Bengang Zhang Hong Lei College of Forestry Guizhou UniversityGuiyang550025China Kaili University Qiandongnan556011China ENSTIB-LERMAB University of LorraineEpinal88051France Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China

Alkali lignin was processed by plasma and then used in modification of phenol formaldehyde resin in this *** structural changes of lignin which was processed by plasma as well as bonding strength,tensile property,curing performance and thermal property of the prepared phenol formaldehyde resin which was modified by the plasma processed lignin were *** demonstrated that:(1)Alkali lignin was degraded after the plasma *** original groups were destroyed,and the aromatic rings collected abundant free radicals and oxygen-containing functional groups like hydroxyls,carbonyls,carboxyls and acyls were introduced into increase the reaction activity of lignin significantly.(2)The introduction of alkali lignin decreased the free formaldehyde content and increased bonding strength and toughness of the prepared phenol formaldehyde resin,especially after the introduction of lignin treated with plasma.(3)The introduction of alkali lignin led to high curing temperature for the prepared phenol formaldehyde resin,but that was reduced by the plasma processed alkali lignin.(4)The introduction of alkali lignin could also increase thermal stability of phenol formaldehyde resin,but that was modified by plasma processed alkali lignin was better than the unprocessed *** on the results,the plasma processed lignin was used to modify phenol formaldehyde resin,which could increase the strength and toughness of phenol formaldehyde resin significantly.

关键词： Alkali lignin plasma phenol formaldehyde resin bonding performance tensile property

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A Bifunctional Brønsted Acidic Deep Eutectic Solvent to Dissolve and Catalyze the Depolymerization of Alkali Lignin

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Journal of Renewable Materials 2021年第2期9卷 219-235页

作者： Lifen Li Zhigang Wu xuedong xi Baoyu Liu Yan Cao Hailong Xu Yingcheng Hu College of Forestry Guizhou UniversityGuiyang550025China ENSTIB-LERMAB University of LorraineEpinal88051France Special and Key Laboratory for Development and Utilization of Guizhou Superior Bio-Based Materials Guizhou Minzu UniversityGuiyang550025China Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education of China College of Material Science and EngineeringNortheast Forestry UniversityHarbin150040China

Lignin is an abundant renewable macromolecular material in nature,and degradation of lignin to improve its hydroxyl content is the key to its efficient *** lignin(AL)was treated with Brønsted acidic deep eutectic solvent(DES)based on choline chloride and p-toluenesulfonic acid at mild reaction temperature,the structure of the lignin before and after degradation,as well as the composition of small molecules of lignin were analyzed in order to investigate the chemical structure changes of lignin with DES treatment,and the degradation mechanism of lignin in this acidic DES was elucidated in this *** and NMR analyses demonstrated the selective cleavage of the lignin ether linkages in the degradation process,which was in line with the increased content of phenolic hydroxyl *** revealed that the O/C atomic ratio of the regenerated lignin was lower than that of the AL sample,revealing that the lignin underwent decarbonylation during the DES *** lignin with low molecular weight and narrow polydispersity index was obtained,and the average molecular weight(Mw)decreased from 17680 g/mol to 2792 g/mol(130°C,3 h)according to GPC *** lignin-degraded products were mainly G-type phenolics and ketones,and small number of aldehydes were also generated,the possible degradation pathway of lignin in this acidic DES was proposed.

关键词： Alkali lignin depolymerization Brønsted acidic deep eutectic solvent structural analysis

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Pharmacist-led interventions in older adults:A bibliometric analysis of scientific literature

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Journal of Chinese Pharmaceutical Sciences 2024年第8期33卷 751-765页

作者： xiaojing Lu xuedong Jia Fangying Si xi Yang Wan Zhang Zhao Yin Department of Pharmacy the First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052HenanChina

Pharmacist-led interventions have demonstrated significant benefits for older adults,with a plethora of studies dedicated to this subject.A bibliometric study was conducted to assess the current state of research and summarize key themes in the domain of pharmacist-led interventions for older *** analysis encompassed publications available in the Web of Science Core Collection from its inception until September 8,*** perform the bibliometric analysis,VOSviewer and CiteSpace software were *** initial query yielded a substantial 6084 relevant documents spanning the period from 1995 to September 8,*** these,5496(constituting 90.34%)were categorized as“Article”.Notably,the yearly output of publications displayed an upward *** body of work emanated from 120 countries and regions,with the United States being the foremost contributor,accounting for the majority of publications(n=2637).The University of Sydney in Australia emerged as the institution with the highest number of publications(n=155).Timothy F Chen,affiliated with the University of Sydney,was the most prolific author,boasting 35 *** T Hanlon,a scholar affiliated with the University of the Sciences in Philadelphia,emerged as the most frequently co-cited *** considering journal productivity,The Journal of Managed Care&Specialty Pharmacy stood out as the most prolific journal(n=251).Conversely,the Journal of the American Geriatrics Society garnered the highest number of co-citations(n=5293).The predominant research themes encompassed the development of new criteria,updates to existing criteria,the utilization of criteria for identifying potentially inappropriate medications in older populations,concerns surrounding inappropriate polypharmacy in this demographic,and the evaluation of the positive impact of pharmacist-led interventions for older *** conclusion,this comprehensive bibliometric analysis offers a panoramic view of pharmacist-led interventi

关键词： Bibliometrics Pharmacist-led interventions Older adults VOSviewer CiteSpace

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单宁树脂砂轮片制备及氧化铝在树脂中的分形分布

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林业工程学报 2016年第1期1卷 88-92页

作者：张俊杜官本席雪冬北京林业大学材料科学与技术学院北京100083 西南林业大学云南省木材胶黏剂及胶合制品重点实验室昆明650224

以杨梅树皮单宁-糠醇共缩聚树脂为基质,氧化铝颗粒为研磨材料,在实验室条件下制备新型可回收砂轮片。采用扫描电子显微镜、布氏硬度、抗压强度以及耐磨测试对砂轮片的外观及强度进行评估,同时通过氧化铝颗粒在树脂中的分布特征,并根据... 详细信息

以杨梅树皮单宁-糠醇共缩聚树脂为基质,氧化铝颗粒为研磨材料,在实验室条件下制备新型可回收砂轮片。采用扫描电子显微镜、布氏硬度、抗压强度以及耐磨测试对砂轮片的外观及强度进行评估,同时通过氧化铝颗粒在树脂中的分布特征,并根据分形理论,采用分形维数来描述其对固化后砂轮片的压缩性能的影响。结果表明:用占树脂质量1.5倍的氧化铝制备的砂轮片,不仅具有光滑无裂痕的表面、高硬度和高抗压强度,还具备优越的耐磨性能。同时,氧化铝颗粒在树脂中的分布具有分形特征,不同的氧化铝含量会在树脂中形成不同的分形维数,砂轮片呈现不同的粗糙度。

关键词：单宁一糠醇树脂氧化铝颗粒分形特征新型砂轮片

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公路盾构隧道纵向疏散口间距设计

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科技通报 2015年第8期31卷 254-258页

作者：奚学东姜学鹏湖北省消防总队培训基地武汉430202 武汉科技大学资源与环境工程学院武汉430081

以武汉三阳路过江隧道为研究对象,利用Pathfinder数值模拟的方法,模拟盾构段交通拥堵情况下,纵向疏散口间距分别为80、100、120 m时,人员的安全疏散状况;并采用公式法计算三种不同疏散口间距时的疏散时间,将计算得全体疏散所需时间与计... 详细信息

以武汉三阳路过江隧道为研究对象,利用Pathfinder数值模拟的方法,模拟盾构段交通拥堵情况下,纵向疏散口间距分别为80、100、120 m时,人员的安全疏散状况;并采用公式法计算三种不同疏散口间距时的疏散时间,将计算得全体疏散所需时间与计算机模拟时间比较。结果表明:三种不同纵向疏散口间距下的疏散时间分别为575、672、758 s,均满足安全疏散要求;公式求得的疏散所需时间与计算机模拟结果一致,且对于疏散口间距较小的情形公式计算得到的结果更准确;根据计算与模拟结果,提出盾构段纵向疏散口间距取100 m建议。

关键词：盾构隧道纵向疏散疏散口间距

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植物乳杆菌G63电转化方法的优化

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食品科学 2016年第3期37卷 180-185页

作者：范璟席雪冬黄彦崔中利东南大学附属第二医院生物治疗中心江苏南京210003 沈阳农业大学植物保护学院辽宁沈阳110866 南京农业大学生命科学学院农业部农业环境微生物重点开放实验室江苏南京210095

为获得植物乳杆菌G63高效的电转化方法,本研究从细胞生长状态、细胞弱化剂质量浓度、洗涤液、质粒添加量和电击参数等方面对菌株G63的电转化效率进行优化。结果表明:取菌株G63对数生长中期的细胞制备感受态,以1 g/100 m L甘氨酸作为细... 详细信息

为获得植物乳杆菌G63高效的电转化方法,本研究从细胞生长状态、细胞弱化剂质量浓度、洗涤液、质粒添加量和电击参数等方面对菌株G63的电转化效率进行优化。结果表明:取菌株G63对数生长中期的细胞制备感受态,以1 g/100 m L甘氨酸作为细胞弱化剂,分别用1 mmol/L Mg Cl2和30 g/100 m L聚乙二醇1000洗涤细胞,并用30 g/100 m L聚乙二醇1000作为电击液,加入20μg穿梭质粒,在1.5 k V和400Ω条件下进行电击,可以获得最高的电转化效率,转化效率达到1.18×103 CFU/μg DNA,满足后续遗传学实验要求。

关键词：植物乳杆菌电转化转化效率

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单宁-糠醇-异氰酸酯热固性树脂砂轮片的制备与性能分析

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功能材料 2016年第6期47卷 228-234页

作者：张俊杜官本梁坚坤席雪冬北京林业大学材料科学与技术学院北京100083 西南林业大学云南省木材胶黏剂及胶合制品重点实验室昆明650224

通过单宁、糠醇与异氰酸酯共缩聚树脂(TFI)为基质,氧化铝颗粒为研磨材料制备新型天然可回收砂轮片,研究了树脂的热性能及砂轮片的力学性能。结果表明,单宁、糠醇与异氰酸酯共缩聚树脂具有很高的玻璃转化温度,并且固化后硬度大。用其制... 详细信息

通过单宁、糠醇与异氰酸酯共缩聚树脂(TFI)为基质,氧化铝颗粒为研磨材料制备新型天然可回收砂轮片,研究了树脂的热性能及砂轮片的力学性能。结果表明,单宁、糠醇与异氰酸酯共缩聚树脂具有很高的玻璃转化温度,并且固化后硬度大。用其制备的砂轮片抗压强度较实验室制备酚醛树脂砂轮片高,同时与商业砂轮片(taber calibrate wheel H-18)相比,单宁-糠醇-异氰酸酯砂轮片具有更好的耐磨性能。因此未来采用TFI为基质制备的砂轮片替代酚醛树脂基砂轮片是可行的。

关键词：天然砂轮片单宁树脂力学性能耐磨性能氧化铝颗粒

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微生物肽类次级代谢产物研究进展

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微生物学通报 2021年第7期48卷 2420-2436页

作者：席雪冬张晓东于志国沈阳农业大学植物保护学院微生物次级代谢产物实验室辽宁沈阳110866

微生物肽类次级代谢产物是一类重要的天然产物,因含有稀有氨基酸而具有丰富的化学结构和生物活性。随着微生物天然产物分离纯化技术的发展,新型肽类产物层出不穷,在微生物次级代谢产物的研究领域扮演了重要的角色。本文综述近年来发现... 详细信息

微生物肽类次级代谢产物是一类重要的天然产物,因含有稀有氨基酸而具有丰富的化学结构和生物活性。随着微生物天然产物分离纯化技术的发展,新型肽类产物层出不穷,在微生物次级代谢产物的研究领域扮演了重要的角色。本文综述近年来发现的来自细菌和真菌的微生物肽类代谢产物,以及采用基因挖掘等手段人工合成的新型肽类产物,并结合近年来本团队昆虫病原线虫共生菌肽类产物的研究积累,分析微生物肽类产物研究存在的问题及可能的解决方案,以期为微生物导向的新型活性肽类产物的深入发掘和应用研究提供参考。

关键词：非核糖体肽化学结构生物合成基因挖掘

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