Canadian Journal of Chemistry最新文献_第10页

Synthesis and Characterization of Phosphorus Containing Polymers for the Generation of Polymer Derived Ceramics 聚合物衍生陶瓷用含磷聚合物的合成与表征

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-12-15 DOI: 10.1139/cjc-2022-0258

Kelly C. Duggan, Ian C. Watson, P. Ragogna

引用次数: 0

C-H arylation enables synthesis of imidazole-4-carboxamide (ICA) based fairy chemicals with plant growth promoting activity C-H基化可以合成具有促进植物生长活性的咪唑-4-羧酰胺类化学物质

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-12-14 DOI: 10.1139/cjc-2022-0256

Ayaka Ueda, Kazuma Amaike, Yoko Shirotani, Robin Warstat, Hideto Ito, Jae-Hoon Choi, H. Kawagishi, K. Itami

{"title":"C-H arylation enables synthesis of imidazole-4-carboxamide (ICA) based fairy chemicals with plant growth promoting activity","authors":"Ayaka Ueda, Kazuma Amaike, Yoko Shirotani, Robin Warstat, Hideto Ito, Jae-Hoon Choi, H. Kawagishi, K. Itami","doi":"10.1139/cjc-2022-0256","DOIUrl":"https://doi.org/10.1139/cjc-2022-0256","url":null,"abstract":"Imidazole-4-carboxamide (ICA), which is one of a group of “fairy chemicals” (FCs) that cause the fairy ring phenomena, has plant growth inhibitory activity. FCs have the potential as candidates for a new family of plant hormones as they have been found endogenously in all plant species tested, and show growth-regulating activity against the plants. While basic research on FCs is progressing, they are also expected to be applied not only to agrochemicals but also as pharmaceuticals. Derivatization of one of FCs, 2-azahypoxanthine (AHX) and the structure-activity relationship (SAR) studies have clarified its activity as a plant growth promoter. Yet, imidazole-4-carboxamide (ICA) has not been derivatized at all and SAR regarding its activity remains unknown. In this study, we synthesized the derivatives of ICA by direct C-H arylation of ICA precursors and evaluated its activity in rice. The 12 total compounds including the arylated ICAs and their precursors were evaluated for root and shoot elongation in rice, resulting in the discovery that a number of compounds unexpectedly have an elongation activity in the root and shoot.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"2016 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86328411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The phosphinoboration of thiosemicarbazones 硫代氨基脲的磷酸化

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-12-09 DOI: 10.1139/cjc-2022-0088

S. Baird, C. Vogels, S. Geier, Lara K. Watanabe, J. Binder, C. L. Macdonald, S. Westcott

引用次数: 0

Mechanistic Approach to the Anti-Oxidant Activities of Metal-Associated Superoxide With Trolox 金属伴生超氧化物与Trolox抗氧化活性的机理探讨

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-12-09 DOI: 10.1139/cjc-2022-0189

Bula Singh, Ranendu Sekhar Das

引用次数: 0

Time-dependent multiconfiguration self-consistent-field and time-dependent optimized coupled-cluster methods for intense laser-driven multielectron dynamics 强激光驱动多电子动力学的时变多组态自洽场和时变优化耦合簇方法

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-11-18 DOI: 10.1139/cjc-2022-0297

Takeshi Sato, Himadri Pathak, Y. Orimo, K. Ishikawa

引用次数: 1

A molecular dynamics simulations investigation on the effects of Ser/Cys exchange in the Ser-cisSer-Lys catalytic triad of Malonamidase E2 丙二胺酶E2 Ser- cisser - lys催化三联体中Ser/Cys交换影响的分子动力学模拟研究

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-11-15 DOI: 10.1139/cjc-2022-0140

A. Roy, J. Gauld

{"title":"A molecular dynamics simulations investigation on the effects of Ser/Cys exchange in the Ser-cisSer-Lys catalytic triad of Malonamidase E2","authors":"A. Roy, J. Gauld","doi":"10.1139/cjc-2022-0140","DOIUrl":"https://doi.org/10.1139/cjc-2022-0140","url":null,"abstract":"The enzyme malonamidase E2 catalytically hydrolyses malonamate (MLA) into malonate and ammonia. Its active site contains an uncommon Ser-cisSer-Lys catalytic triad that is critical to its functioning. Mutations of the residues in this triad can not only provide insight into its key features but can also potentially identify how it may be influenced or adapted, i.e., decreased or increased. In this study, the effects of single and double Ser/Cys exchanges on the wildtype Ser155-cisSer131-Lys62 catalytic triad (i.e., Cys155-cisSer131-Lys62 (S155C), Ser155-cisCys131-Lys62 (S131C), and Cys155-cisCys131-Lys62 (S131C/S155C)) were examined. In particular, the dynamics and stability of the resulting substituted triads was examined along with their inter-triad residue hydrogen bonding interactions as well as those with other nearby residues and the MLA substrate. The present results suggest that some mutations are more impactful than others. Indeed, mutation of cisSer131 to cisCys131 disrupts the triad and causes inconsistent hydrogen bonding interactions among the triad residues (i.e., Ser155, Cys131, and Lys62). In contrast, in the double mutant Cys155-cisCys131-Lys62, the triad’s residues appear to exhibit greater conformation stability with more consistent hydrogen bond interactions, though not necessarily as in the wildtype.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"4 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84075760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of very high dose rates on the radiolysis of supercritical water at 400 °C and 25 MPa 极高剂量率对超临界水在400°C和25 MPa下辐射分解的影响

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-11-15 DOI: 10.1139/cjc-2022-0210

A. Sultana, J. Meesungnoen, J. Jay-Gerin

{"title":"Effect of very high dose rates on the radiolysis of supercritical water at 400 °C and 25 MPa","authors":"A. Sultana, J. Meesungnoen, J. Jay-Gerin","doi":"10.1139/cjc-2022-0210","DOIUrl":"https://doi.org/10.1139/cjc-2022-0210","url":null,"abstract":"Monte Carlo multi-track chemistry simulations were used in combination with a cylindrical, “instantaneous pulse” irradiation model to study the effect of high dose rates on the early, transient yields (G values) of the “primary products” (e-aq, H•, H2, •OH, H2O2, H3O+, OH-,…) of the radiolysis of supercritical water (SCW) at 400 °C and 25 MPa pressure. Our simulation model consisted of randomly irradiating SCW with single pulses of N incident 300-MeV protons, which mimic the low linear energy transfer of 60Co γ/fast electron irradiations. The effect of dose rate was studied by varying N. Generally, high dose rates were found to favor radical-radical reactions, which increases the proportion of the molecular products at the expense of the radical products. However, as an exception, G(H•) increases with increasing dose rate in the track stage of radiolysis, predominantly due to the reaction of hydrated electrons with hydronium ions (H3O+). In addition, the generation of acidic spikes due to proton transfer reactions in the physicochemical stage was also examined. Interestingly, an early, transient, very acidic (pH ~ 3.5) response was observed at high radiation dose rates across the entire irradiated volume. The present work raises the question of whether the potential oxidizing species •OH and H2O2 and these highly acidic pH spikes at high dose rates could promote a corrosive environment under proposed Generation-IV SCW-cooled reactor or small modular reactor operating conditions that would lead to progressive degradation of materials.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"48 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78208011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly sensitive and selective detection of selenate in water samples using an enzymatic gold nanodendrite biosensor 利用酶促金纳米树突生物传感器对水样中硒酸盐进行高灵敏度和选择性检测

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-11-15 DOI: 10.1139/cjc-2022-0220

Mozhgan Khorasani Motlagh, M. Noroozifar, H. Kraatz

{"title":"Highly sensitive and selective detection of selenate in water samples using an enzymatic gold nanodendrite biosensor","authors":"Mozhgan Khorasani Motlagh, M. Noroozifar, H. Kraatz","doi":"10.1139/cjc-2022-0220","DOIUrl":"https://doi.org/10.1139/cjc-2022-0220","url":null,"abstract":"Gold (Au) and glassy carbon (GC) electrodes have been decorated with gold nanodendrites (NDs) using galvanic replacement reactions. Modification of the ND surfaces by lipoic acid N-hydroxysuccinimide ester allows to immobilise selenate reductase (SeR) to the electrode surface, rendering it selective for the catalytic reduction of selenate (SeO42-, Se(VI)) to selenite (SeO32-, Se(IV)). Electrode modifications have been characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). For selenate detection, CV and differential pulse voltammetry (DPV) measurements have been carried out in HEPES buffer with pH 6.0. Under optimum conditions, the linear range for Au electrodes decorated with AuNDs was 0.3-203 µg/L Se with a limit of detection of 0.01 µg/L Se, which is a 274-fold improvement over using non-nanostructured surfaces for selenate detection. Other anions such as SO42−, NO3-, NO2-, PO43-, AsO43- and SeO32- did not interfere with the detection of selenate. The electrochemical sensor was used for the detection of selenate in three different real samples with recovery between 98.5-102.0%.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"176 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73444955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complexation-Induced N‒P Axial Chirality in Sm(II) N-Phosphine-Oxide-Substituted Imidazolylidene and Imidazolinylidene Complexes Sm(II) n-膦-氧化物取代咪唑酰基和咪唑酰基配合物配位诱导的N-P轴向手性

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-11-10 DOI: 10.1139/cjc-2022-0249

Y. Hoshimoto, Y. Yamauchi, T. Terada, S. Ogoshi

引用次数: 1

Convenient Preparation of Copper (I) N-Heterocyclic Carbene Complexes Under Mild Conditions 温和条件下铜(I) n -杂环卡宾配合物的制备

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2022-11-10 DOI: 10.1139/cjc-2022-0229

Meilin Q. Lim, Eric C. Keske

引用次数: 0