检索结果-南通市图书馆

Plant Diseases and Pests 2022年第6期13卷 4-5,13页

作者： yenan wang Dejie YANG Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences Hainan Innovation Center of Academician TeamWenchang 571339China

[Objectives]The paper was to explore a new method for preparing nano ZnO particles.[Methods]A mixture of 2,6-di(2′,4′-dicarboxylphenyl)pyridine(0.05 mM),Zn(NO_(3))2·6H_(2)O(0.1 mM)were added to the solution of DMA(3 mL)and H_(2)O(3 mL),and heated at 90℃for 12 *** PXRD,TGA and fluorescence properties were characterized.[Results]Transparent block crystals of the[Zn_(2)(2,6-ddpp)(DMA)_(3)(H_(2)O)·H_(2)O]n were obtained(yield 85.4%,based on Zn).The Zn-MOF framework would collapse to form ZnO particles when the temperature exceeded 350℃.[Conclusions]A new Zn(II)-MOF is successfully constructed,and the compound exhibits monoclinic P21/c space *** results will provide a theoretical basis for the preparation of nano ZnO.

关键词： Nano ZnO Zn(II)-MOF P21/c space group

Crystal Structure of Poly[(2,6-di(2’,4’-dicarboxylphenyl)pyridine-κ4 O:O′:O″:O′′′)-(μ2-1,4-bis(1-imidazolyl)benzene-κ2N:N’)cobalt(II)],C_(39)H_(24)Co_(2)N_(7)O_(8)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diseases and Pests 2021年第1期12卷 38-43页

作者： wang yenan Liu Bo Niu Xiaoqing Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences Hainan Innovation Center of Academician TeamWenchang 571339China

[Objective]The paper was to synthesize a new structure of metal organic framework,and to provide new materials for plant pathogens testing.[Method]A mixture of 2,6-di(2’,4’-di-carboxylphenyl)pyridine,1,4-bis(1-imidazolyl)benzene,Co(NO_(3))2·6H_(2)O were added to the solution of DMF:H2O=3:3 and heated at 433K for 4 d.[Result]Red crystals of the title compound were obtained(yield 76.3%,based on Co).[Conclusion]The crystal data were obtained as follows:C_(39)H_(24)Co_(2)N_(7)O_(8),monoclinic,P21/c,a=16.222(7)A,b=12.653(5)A,c=17.456(7)A,β=102.386(6)°,V=3500(2)A_(3),Z=4,Rgt(F)=0.0550,wRref(F2)=0.1509,T=293(2)K.

关键词： Poly[(2,6-di(2’,4’-dicarboxylphenyl)pyridine Cobalt(II)

Syntheses,Structures of A Cobalt(Ⅱ) Metal-organic Framework Based on 2,6-di(2',4'-dicarboxylphenyl) pyridine and 4,4'-bis(imidazol-1-ylmethyl) biphenyl-ligands

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diseases and Pests 2022年第5期13卷 4-9页

作者： yenan wang Xiaoqing NIU Bo LIU Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences Hainan Innovation Center of Academician TeamWenchang 571339China

[Objectives]The paper was to synthesize and describe a new 3D structure of a mew metal organic framework,and to provide new materials for the study of interdisciplinary.[Methods]A mixture of H_(4)L=2,6-di(2,4-dicarboxylphenyl)pyridine,bimb=4,4-bis(imidazole-1-ylmethyl)biphenyl,Co(NO_(3))_(2)·6H_(2)O were added to the solution of DMF∶H_(2)O=4∶2 and heated at 433 K for 4 d.[Results]Purple block crystals of the Co-compound were obtained(yield 83.6%,based on Co).[Conclusions]The crystal data are obtained as follows:C_(51)H_(36)Co_(2)N_(7)O_(9),Triclinic,P-1,a=9.916(8),b=15.926(14),c=15.945(13),α=113.913(13)°,β=93.929(9)°,γ=95.033(3)°,V=2278(3)A^(3),Z=2,R=0.0803(6446),wR_(2)=0.2106(10370),T=296 K.

关键词： Cobalt(Ⅱ) Metal-organic framework Crystal Syntheses Structure

Cloning and Expression Analysis of RrG-Beta1 Gene Related to Anthocyanin Biosynthesis in Rosa rugose

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2018年第11期9卷 2244-2255页

作者： yenan wang Mingyuan Zhao Xu Han Lanyong Zhao Zongda Xu College of Forestry Shandong Agricultural University Taian China

As an important signal transduction protein, G protein beta subunit gene encoded by oligonucleotides plays an important role in many physiological, biochemical and environmental stresses in plants. In order to understand the action mode of G protein beta subunit gene, this paper cloned a Wd40 gene related to G protein beta subunit gene, named RrG-beta1, based on the R. rugose—transcriptome data, using Rosa rugose “Zi zhi” as experimental materials. The full length of cDNA of the gene was obtained by RT-PCR and RACE methods. The total length of this gene is 981 bp, and it encodes 326 amino acids. After bioinformatics analysis, the molecular formula C1601H2520N450O486S11 was predicted;the relative molecular weight was 36,201.00 Da;the theoretical isoelectric point PI value was 6.71;and its instability index was 30.44. The total average hydrophobic index was -0.847. In the secondary structure of RrG-beta1 protein, there are 17 α-helix, 131 Random coil, and 141 extended peptide chain. Gene Bank Blast results showed that the amino acid sequence encoded by RrG-beta1 was more than 90% homologous with the beta-like protein of Rosa chinensis, Fragaria, Malus, Pyrus, Prunus, Arabidopsis and tobacco, so it can be inferred that the RrG-beta1 Gene is guanine nucleotide-binding protein subunit beta-like protein. Fluorescence quantitative expression analysis of RrG-beta1 protein decreased with the development of flower color, and it was speculated that it could exert negative regulation effect on flower color. The leaf expression was highest in the tissue part, so it was inferred that the signal was transmitted through the stoma on the leaf.

关键词： Rosa rugose Gβ Signal Transduction Drought Stress Gene Expression

Cloning and Expression Analysis of RrRUP2 Gene Related to Photomorphogenesis Biosynthesis in Rosa rugosa

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2018年第13期9卷 2533-2544页

作者： yenan wang Mingyuan Zhao Xu Han Lanyong Zhao Zongda Xu College of Forestry Shandong Agricultural University Taian China

Plants have evolved and perfected a series of light receptors to feel the light at different bands and regulate the expression, modification and interaction of related genes in plants through signal transduction. So far, many photoreceptors have been identified in plants, UVR8 has recently been identified as a receptor for UV-B light. This paper cloned a WD40 gene related to UVR8 protein subunit, named RrRUP2, based on the Rosa rugose transcriptome data, using Rosa rugose “Zi zhi” as experimental materials. The full length of cDNA of the gene was obtained by RT-PCR and RACE methods. The total length of this gene is 1173 bp, and it encodes 390 amino acids. After bioinformatics analysis, the molecular formula C3415H5659N1173O1434S313 was predicted;the relative molecular weight was 96129.27 Da;the theoretical isoelectric point PI value was 5.00;and its instability index was 47.06. The total average hydrophobic index was 0.750. In the secondary structure of RrRUP2 protein, there are 10 α-helix, 45 β-helix, 181 Random coil, and 154 Extended strand. Gene Bank Blast results showed that the amino acid sequence encoded by RrRUP2 was more than 90% homologous with the RUP2 protein of Rosa chinensis, Fragaria, Malus, Pyrus, Prunus, Juglans, Arabidopsis and Tobacco, so it can be inferred that the RrRUP2 gene is a WD repeat-containing protein. Regarding to fluorescence quantitative expression analysis of RrRUP2, we find its experssion pattern is corresponded with the accumulation of anthocyanins.

关键词： Rosa rugose UV-B UVR8 RUP2 Photomorphogenesis Anthocyanin Gene Expression

Screening of Growth-Promoting Strains for Areca Palm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diseases and Pests 2024年第5期15卷 1-4页

作者： Dejie YANG yenan wang Zhaowei LIN Xiaoqing NIU Coconut Research Institute Chinese Academy of Tropical Agricultural Sciences/Hainan Engineering Research Center of Arecanut IndustryWenchang 571339China

[Objectives]The paper was to identify growth-promoting strains within the culturable bacterial flora of areca palm.[Methods]Culturable bacteria were isolated and identified from areca palm using samples obtained from both healthy and yellowing disease-affected plants within the same *** that exhibited significant differences between healthy and affected samples,or that were unique to the healthy samples,were subsequently screened for their growth-promoting effects.[Results]Three bacterial strains demonstrated robust and consistent capacity for auxin production,specifically Paenibacillus,Pseudomonas aeruginosa,and Bacillus amyloliquefaciens,each yielding approximately 50μg of IAA per mL of bacterial *** strain Alcaligenes faecalis exhibited the highest efficacy in siderophore production,achieving 21.15%of active ***,***,Bacillus velezensis,and *** were noted for their potassium-solubilizing capabilities,as evidenced by the presence of distinct potassium-solubilizing zones.[Conclusions]The evaluation of the aforementioned growth-promoting strains may offer valuable insights for the development of growth-promoting strains specifically for areca palm.

关键词： Areca palm Yellow leaf disease Auxin production Siderophore production Potassium-solubilizing

基于档案的城市记忆资源建设全过程模型及应用研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

档案学研究 2017年第1期 24-30页

作者：牛力王烨楠中国人民大学数据工程与知识工程教育部重点实验室北京100872 中国人民大学信息资源管理学院北京100872 中国人民大学人文北京研究中心北京100872

城市记忆是城市历史的见证,城市记忆建构过程实质是对城市记忆资源的深度开发利用的过程。档案是城市记忆的载体,是建构城市记忆的重要资源,本文以档案为基础构建城市记忆资源建设的全过程模型,具体分析输入—处理—输出三大阶段的流程... 详细信息

城市记忆是城市历史的见证,城市记忆建构过程实质是对城市记忆资源的深度开发利用的过程。档案是城市记忆的载体,是建构城市记忆的重要资源,本文以档案为基础构建城市记忆资源建设的全过程模型,具体分析输入—处理—输出三大阶段的流程、步骤和方法,并通过实例验证过程模型的可行性,深化理论研究,为工程实践提供参考。

关键词：城市记忆档案资源记忆资源资源建设

Preparation and Regeneration Conditions of Ceratocystis paradoxa Protoplast

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Plant Diseases and Pests 2019年第5期10卷 7-10页

作者： Niu Xiaoqing Yu Fengyu wang yenan Tang Qinghua Zhu Hui Qin Weiquan Coconut Research Institute Chinese Academy of Tropical Agricultural SciencesWenchang 571339China

[Objective]The paper was to reveal the preparation and regeneration conditions of Ceratocystis caradoxa protoplast.[Method]Using multi-factors orthogonal test,the effects of hypha age,enzyme system,time of hydrolysis,hydrolysis temperature,osmotic pressure stabilizer and regeneration medium on *** protoplast were studied.[Result]The optimum condition for preparing protoplast were conidia cultured in liguid SYM medium for 24 h,enzyme mixture of 1%driselase and 1%lytic enzyme used to digest hypha for 1.5 h,0.7 mol/L MgSO4·7H2O used as osmotic stabilizer,or individual enzyme 1%driselase used to digest hypha for 1.5 h,1.0 mol/L mannitol as osmotic *** regeneration rate was over 40%under *** protoplast regenerating on CM medium with mannitol and hydrolysis for 2 h.[Conclusion]Higher protoplast yield and higher regeneration rate could be obtained under above conditions,which is beneficial for transformation and further research.

关键词： Ceratocystis paradoxa Protoplast Regeneration

2型糖尿病患者增生性糖尿病视网膜病变玻璃体切割术后玻璃体再积血原因分析

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华实验眼科杂志 2014年第11期32卷 1021-1024页

作者：王叶楠卢海刘大川首都医科大学宣武医院眼科北京100053 首都医科大学附属北京同仁医院眼科北京100730

背景玻璃体切割术是治疗2型糖尿病患者增生性糖尿病视网膜病变（PDR）的有效方法,但术后再次出现玻璃体积血是导致患者视力再次下降的主要原因之一.目的分析2型糖尿病PDR患者行玻璃体切割术后玻璃体再积血的相关因素,探讨其预防及处... 详细信息

背景玻璃体切割术是治疗2型糖尿病患者增生性糖尿病视网膜病变（PDR）的有效方法,但术后再次出现玻璃体积血是导致患者视力再次下降的主要原因之一.目的分析2型糖尿病PDR患者行玻璃体切割术后玻璃体再积血的相关因素,探讨其预防及处理方法.方法采用系列病例回顾性研究的方法,收集2006年2月至2012年12月在首都医科大学宣武医院及北京同仁医院接受玻璃体切割术的305例2型糖尿病PDR患者305例305眼的临床资料,对其中14例14眼术后发生玻璃体积血的原因、表现和治疗效果进行分析.结果 305例糖尿病PDR患者接受玻璃体切割术后发生玻璃体积血者14例,发生率为4.6％,其中3例眼底病变为PDRⅣ期,4例为Ⅴ期,7例为Ⅵ期.14眼均经标准睫状体切口玻璃体切割术,术中均给予眼内激光光凝,1眼行巩膜外冷凝术,8眼行玻璃体腔内硅油填充.首次玻璃体切割术后6眼视力提高,4眼术后视力无改变,4眼视力较术前下降.术后再次出现玻璃体积血的时间为术后1～7d者9眼,术后8d～3个月者1眼,术后3～6个月者2眼,术后6个月以上者2眼.玻璃体再积血的原因主要为新生血管膜残留、激光光凝范围和强度不足、新生血管形成及血糖浓度不稳定.5眼药物治疗后玻璃体积血吸收,9眼再次行玻璃体手术.最终9眼视力提高,2眼视力不变,3眼视力下降;13眼患眼视网膜复位,1眼硅油填充术后视网膜仍未复位.结论 PDR行玻璃体切割术后玻璃体再积血多发生于术后1周内,与视网膜新生血管残留、眼内激光光凝不充分及血糖水平控制欠佳有关.出血量较少的患者玻璃体积血可以自行吸收或可行药物治疗,出血量较大且持续不吸收的患者需要再次行玻璃体切割术.

关键词：糖尿病/并发症增生视网膜病变/治疗,手术玻璃体切割术玻璃体再积血

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

散射体边界的凸起结构对声子晶体带隙的影响

天津师范大学学报（自然科学版） 2021年第2期41卷 24-30页

作者：魏少宏王业南刘頔北京工业大学机械工程与应用电子技术学院北京100124 中国汽车技术研究中心有限公司北京100070

为研究二维固/固型声子晶体散射体边界的凸起结构对带隙特性的影响,采用有限元建模方法,建立矩形和三角形2种凸起形状边界的正方形散射体模型,在固定填充率的情况下,分析了不同凸起结构(矩形和三角形)、凸起高度和凸起数目对声子晶体禁... 详细信息

为研究二维固/固型声子晶体散射体边界的凸起结构对带隙特性的影响,采用有限元建模方法,建立矩形和三角形2种凸起形状边界的正方形散射体模型,在固定填充率的情况下,分析了不同凸起结构(矩形和三角形)、凸起高度和凸起数目对声子晶体禁带出现位置及宽度的影响.此外,对无凸起结构正多边形散射体的带隙结构进行计算,并将此计算结果与有凸起结构的声子晶体进行对比.研究结果表明:在相同填充率下有凸起结构的正方形散射体对带隙的影响明显大于无凸起结构的正多边形散射体;通过调节凸起结构的高度和数目可以调控声子晶体的带隙特性,且凸起结构的高度对带隙的影响大于其数目对带隙的影响.

关键词：声子晶体带隙特性凸起结构散射体