Chemistry Letters最新文献_第10页

Indications for echocardiography and confirmation rates of cardiovascular diseases: experience of a specialist cardiac outpatient clinic in Kumasi, Ghana. 超声心动图检查的适应症和心血管疾病的确诊率：加纳库马西心脏病专科门诊的经验。

IF 1.1 4区化学

Chemistry Letters Pub Date : 2023-10-01 DOI: 10.4103/aam.aam_151_22

Yaw Amo Wiafe, Emmanuel Acheamfour-Akowuah, Isaac Kofi Owusu

{"title":"Indications for echocardiography and confirmation rates of cardiovascular diseases: experience of a specialist cardiac outpatient clinic in Kumasi, Ghana.","authors":"Yaw Amo Wiafe, Emmanuel Acheamfour-Akowuah, Isaac Kofi Owusu","doi":"10.4103/aam.aam_151_22","DOIUrl":"10.4103/aam.aam_151_22","url":null,"abstract":"Background: Transthoracic echocardiography is a very helpful noninvasive cardiovascular imaging technique for the diagnosis and risk stratification in the management of patients with cardiovascular diseases. We aimed to review the clinical indications for transthoracic echocardiography and the confirmation rate of cardiovascular diseases by echocardiography at a specialist cardiac clinic in Ghana.Methods: Using a cross-sectional study design, the echocardiography reports of all patients above the age of 15 who were assessed at the clinic were analyzed. Data on patient demographics, clinical history, clinical indication for echocardiography, and the echocardiographic findings were analyzed using version 25.0 of the Statistical Package for Social Sciences (SPSS).Results: A total of 594 participants were studied. The age range of participants was 15-96 years, with a mean (± standard deviation) age of 53.72 (± 17.25) years. There were more females (50.17%) than males (49.83%). Most (54.21%) of the participants had echocardiography for cardiac evaluation. Other indications included hypertension/hypertensive heart disease (HHD) (n = 131; 22.06%), heart failure (n = 69; 11.62%), chest pains (n = 12; 2.02%), and valvular heart disease (VHD) (n = 11; 1.85%). Three hundred and eight-nine (70.30%) of the participants had their clinical diagnoses confirmed by echocardiography; echocardiographic confirmation rates for heart failure, VHD, and HHD were 92.75%, 90.91%, and 88.54%, respectively.Conclusion: Echocardiography showed high confirmation rates for our patients with heart failure, VHD, and HHD. Prompt usage of this noninvasive cardiovascular imaging for the initial evaluation of patients with cardiovascular diseases is highly recommended.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"4 1","pages":"440-445"},"PeriodicalIF":1.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10775930/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88490250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Antibacterial rattle-type polypyrrole-silver nanocomposite particles synthesized by aqueous chemical oxidative dispersion polymerization 水化学氧化分散聚合法制备抗菌响尾蛇型聚吡咯-银纳米复合粒子

4区化学

Chemistry Letters Pub Date : 2023-09-30 DOI: 10.1246/cl.230318

Nattawut Rodtuk, Kazusa Takeuchi, Tomoyasu Hirai, Yoshinobu Nakamura, Warayuth Sajomsang, Preeyaporn Chaiyasat, Amorn Chaiyasat, Syuji Fujii

引用次数: 0

The Effect of Mixed Ligands on the Polymerization Rate of SET-LRP in Aqueous Solution 混合配体对SET-LRP水溶液聚合速率的影响

4区化学

Chemistry Letters Pub Date : 2023-09-29 DOI: 10.1246/cl.230355

Xiaojing Feng, Wenxia Yuan

引用次数: 0

Synthesis, Characterization, and Application of a Cyclic Stilbene Derivative with Simultaneous Two-Photon Absorption Character 具有双光子吸收特性的环二苯乙烯衍生物的合成、表征及应用

4区化学

Chemistry Letters Pub Date : 2023-09-28 DOI: 10.1246/cl.230388

Erik Budi Santiko, Shrestha Binod Babu, Fan Zhang, Cheng-Lin Wu, Tzu-Chau Lin, Manabu Abe

{"title":"Synthesis, Characterization, and Application of a Cyclic Stilbene Derivative with Simultaneous Two-Photon Absorption Character","authors":"Erik Budi Santiko, Shrestha Binod Babu, Fan Zhang, Cheng-Lin Wu, Tzu-Chau Lin, Manabu Abe","doi":"10.1246/cl.230388","DOIUrl":"https://doi.org/10.1246/cl.230388","url":null,"abstract":"A new cyclic 1 stilbene derivative, 6-(4-(diphenylamino)phenyl)-N,N-diphenyl-7,8-dihydronaphthalen-2-amine (D2PDN), featuring quadrupolar system having electron-donating substituents (NPh2), was synthesized and characterized in this study. The fluorescence quantum yield was 89% (under air) and 99% (under argon) in toluene. The two-photon (2P) cross-section was determined to be 166 GM at 700 nm using 2P-excitation fluorescence method. The 2P-responsive chromophore in near-infrared region has reversible oxidation signals at 0.17, 0.28, and 0.53 V vs Fc0/Fc+. Compound D2PDN, E*ox = –2.83 V, was found to be used as a simultaneous 2P-responsive photoredox catalyst. A new cyclic stilbene derivative, 6-(4-(diphenylamino)phenyl)-N,N-diphenyl-7,8-dihydronaphthalen-2-amine (D2PDN) was synthesized and characterized. The fluorescence quantum yield was 99% under Argon in toluene. The two-photon (2P) cross-section was determined to be 166 GM at 700 nm. The 2P-responsive chromophore has reversible oxidation potentials at 0.17, 0.28, and 0.53 V vs Fc0/Fc+. D2PDN was found to be used as a photoredox catalyst.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342863","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

Gelation of Hydrophilic Polymer Bearing Metal-Coordination Unit with Various Metal Ions 含金属配位单元的亲水聚合物与多种金属离子的凝胶化

4区化学

Chemistry Letters Pub Date : 2023-09-28 DOI: 10.1246/cl.230347

Daisuke Nagai, Naoki Isobe, Yasuyuki Maki, Shusuke Okamoto

引用次数: 0

Etching of TiO₂(110) Single-Crystal Surface with Aniline for Step Direction Control 苯胺刻蚀TiO2(110)单晶表面的阶梯方向控制

4区化学

Chemistry Letters Pub Date : 2023-09-27 DOI: 10.1246/cl.230334

Mami Takahari, Taiga Goto, Soichiro Yoshimoto, Toshihiro Kondo

引用次数: 0

Unraveling the Interactions between Nanoparticles and Benzo[a]pyrene in Environmental Waters and Human Blood by Dissipative Particle Dynamics Simulations 耗散粒子动力学模拟揭示了环境水体和人体血液中纳米颗粒与苯并[a]芘之间的相互作用

4区化学

Chemistry Letters Pub Date : 2023-09-22 DOI: 10.1246/cl.230337

Hainan Sun, Yingying Wang, Xiangan Meng, Manman Hu, Xin Yan

引用次数: 0

Pin-point surgery of proton-deuterium substitution to enhance polybenzimidazole thermoresistances 质子-氘取代的定点手术提高聚苯并咪唑的耐热性

4区化学

Chemistry Letters Pub Date : 2023-09-22 DOI: 10.1246/cl.230315

Xianzhu Zhong, Aniruddha Nag, Jiabei Zhou, Kenji Takada, Motoyuki Kusano, Tatsuo Kaneko

{"title":"Pin-point surgery of proton-deuterium substitution to enhance polybenzimidazole thermoresistances","authors":"Xianzhu Zhong, Aniruddha Nag, Jiabei Zhou, Kenji Takada, Motoyuki Kusano, Tatsuo Kaneko","doi":"10.1246/cl.230315","DOIUrl":"https://doi.org/10.1246/cl.230315","url":null,"abstract":"Thermal stability plays a crucial role in determining the polymer suitability as high-performance thermoresistant materials, which are highly demanded for lightweight substitute to metal or ceramic materials in a sustainable society. We here present an innovative approach involving the in-situ substitution of imidazole protons of polybenzimidazole (PBI) derivatives with deuterium using deuterated solvents to enhance thermal stability. The resulting substituted polymers exhibited significantly higher thermal decomposition temperatures compared to their original counterparts. This notable improvement can be attributed to the N-D bond, which possesses a low stretching frequency, demanding a greater amount of activating energy compared to the N-H bond, enabling the polymer to withstand higher temperatures. This discovery presents a novel and promising avenue for enhancing polymer thermoresistance, providing valuable insights for the development of advanced materials with enhanced thermal stability. Pinpoint surgery through in situ isotopic proton-deuterium substitution significantly enhanced the thermal degradation temperature of polybenzoxazoles, this is because N-D bond exhibit a lower stretching frequency than N-H, demanding more activating energy and thus can withstand higher temperature. This discovery provides a novel and straightforward method to elevate thermostability for polymers.","PeriodicalId":9862,"journal":{"name":"Chemistry Letters","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136010427","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

Structure Identification of Dynamic Zinc(II)-Ligand Assemblies in Solution Based on Ligand Chirality 基于配体手性的溶液中动态锌(II)-配体组合的结构识别

4区化学

Chemistry Letters Pub Date : 2023-09-15 DOI: 10.1246/cl.230353

Daiji Ogata, Junpei Yuasa

引用次数: 0

Formation of Novel Polycyclic Aromatic Compounds by Scholl Reactions of Di(1-anthryl) Ketones via Cyclization and Rearrangement 二(1-蒽基)酮经环化重排反应生成新型多环芳香族化合物

4区化学

Chemistry Letters Pub Date : 2023-09-12 DOI: 10.1246/cl.230340

Shinji Toyota, Hiroshi Sekikawa, Hiroki Fukuda, Hiroshi Ikeda, Eiji Tsurumaki

引用次数: 0