ECD

ECD
  • 文章类型: Journal Article
    本研究利用密度泛函理论(DFT)和波函数分析探讨了量子尺寸对[n]芳烃(n=5、6、7、8)光学性质的影响。研究了单光子吸收(OPA)和双光子吸收(TPA)光谱中的电子跃迁机理,以及这些系统的电子圆二色性(ECD)的计算。过渡密度矩阵(TDM)和电子-空穴对密度图用于研究电子激发特性,揭示了一个值得注意的大小依赖关系。对跃迁电偶极矩(TEDM)和跃迁磁偶极矩(TMDM)的分析揭示了柱[n]芳烃内部的电磁相互作用机制。拉曼光谱计算进一步阐明振动模式,在使用静电势(ESP)分析研究与外部环境的相互作用时,在外部磁场下评估电子离域,提供对这些超分子结构中磁感应电流现象的见解。通过从头算分子动力学(AIMD)研究了柱[n]芳烃的热稳定性。
    This study explores the quantum size effects on the optical properties of pillar[n]arene (n = 5, 6, 7, 8) utilizing density functional theory (DFT) and wave function analysis. The mechanisms of electron transitions in one-photon absorption (OPA) and two-photon absorption (TPA) spectra are investigated, alongside the calculation of electron circular dichroism (ECD) for these systems. Transition Density Matrix (TDM) and electron-hole pair density maps are employed to study the electron excitation characteristics, unveiling a notable size dependency. Analysis of the transition electric dipole moment (TEDM) and the transition magnetic dipole moment (TMDM) reveals the electromagnetic interaction mechanism within pillar[n]arene. Raman spectra computations further elucidate vibrational modes, while interactions with external environments are studied using electrostatic potential (ESP) analysis, and electron delocalization is assessed under an external magnetic field, providing insights into the magnetically induced current phenomena within these supramolecular structures. The thermal stability of pillar[n]arene was investigated by ab initio molecular dynamics (AIMD).
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  • 文章类型: Case Reports
    跨越心理学等领域数十年的研究,教育,神经科学始终强调社会情绪技能在个人各个方面的关键作用,学术,和专业发展(1-3)。教科文组织认识到社会情感学习(SEL)不仅对于实现其教育目标,而且对于实现可持续发展目标至关重要,这一事实凸显了强大的社会情感发展在建立可持续社会中的关键作用。虽然各种研究强调了SEL的重要性,关于组织如何通过有意识地将SEL纳入其工作实践中来为构建此类开发做出贡献的关注有限。
    我们的案例研究介绍了在9个月内将SEL整合到组织实践中的过程。SEL的选定结构是由组织的需求和价值观决定的。测量变化的方法被用来框架和实施干预,互动讨论是关键的方法。数据是通过调查收集的,反射分享,和观察。
    记录了选定的SEL构建体的偏移,数据突出了个体差异。
    共同设计和持续反思实践的过程是在组织的子集内实现变革的关键,而不是所使用材料的具体内容。
    Research spanning decades across fields such as psychology, education, and neuroscience consistently highlights the crucial role of social-emotional skills in various aspects of personal, academic, and professional development (1-3). The fact that UNESCO recognises social-emotional learning (SEL) as essential not just for meeting its educational objectives but also for accomplishing the Sustainable Development Goals highlights the crucial role robust social-emotional development plays in establishing sustainable societies. Whilst various studies highlight the importance of SEL, there is limited attention on how organizations can contribute to building such development by consciously including SEL in their work practice.
    Our case study presents the process of integrating SEL into organizational practice over a period of 9 months. The selected constructs of SEL were determined by the organisation\'s needs and values. The Measurement for Change approach was used to frame and implement the intervention, with interactive discussions being the key methodology. Data were collected via surveys, reflective sharing, and observations.
    A shift in the selected constructs of SEL was recorded, with data highlighting individual differences.
    The process of co-design and continual reflective practice was key to achieving change within the subset of the organisation rather than the specific content of the materials used.
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  • 文章类型: Journal Article
    在不同的条件下,DNA双螺旋可以采取不同的几何形式。在它的大量构象中,除了“规范”B表格之外,A,C,Z形式是众所周知的,还有D,Hoogsteen,和X形式是鲜为人知的。DNA在当地取A,C,Z在细胞中形成,与蛋白质的复合物。我们比较了检测非规范DNA构象的不同方法:X射线,IR,和拉曼光谱,红外和紫外区域的线性和圆二色性,以及NMR(化学位移及其各向异性的测量,标量和残余偶极耦合以及来自NOESY(核Overhauser效应光谱)数据的质子间距离)。我们讨论了应用这些方法的困难,实验结果的理论解释问题,以及可靠鉴定非规范DNA构象的前景。
    Under different conditions, the DNA double helix can take different geometric forms. Of the large number of its conformations, in addition to the \"canonical\" B form, the A, C, and Z forms are widely known, and the D, Hoogsteen, and X forms are less known. DNA locally takes the A, C, and Z forms in the cell, in complexes with proteins. We compare different methods for detecting non-canonical DNA conformations: X-ray, IR, and Raman spectroscopy, linear and circular dichroism in both the infrared and ultraviolet regions, as well as NMR (measurement of chemical shifts and their anisotropy, scalar and residual dipolar couplings and inter-proton distances from NOESY (nuclear Overhauser effect spectroscopy) data). We discuss the difficulties in applying these methods, the problems of theoretical interpretation of the experimental results, and the prospects for reliable identification of non-canonical DNA conformations.
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  • 文章类型: Journal Article
    一系列拥有两个喹啉的分子,苯并喹啉,开发并表征了通过联芳基连接以手性方式连接的菲咯啉或它们的水溶性衍生物。研究了结构对两个杂环中氮原子碱性的影响,并通过实验和计算研究了化合物在质子化时的光物理和手性转换活性。结果表明,质子化的电子结构的变化与中性物种,促进主要电子跃迁的红移和它们的特性从π到π*到电荷转移型的交替,当额外伴随着系统的高结构灵活性时,导致质子结合时构象偏好的变化,在酸性介质中产生特别明显的光谱特性变化。后者与读出的可逆性相结合,使该系列中的某些分子非常有前途的多功能pH探针。
    A series of molecules that possess two quinolines, benzoquinolines, or phenanthrolines connected in a chiral fashion by a biaryl junction along with their water-soluble derivatives was developed and characterized. The influence of the structure on the basicity of the nitrogen atoms in two heterocycles was examined and the photophysical and chiroptical switching activity of the compounds upon protonation was studied both experimentally and computationally. The results demonstrated that changes in the electronic structure of the protonated vs. neutral species, promoting a bathochromic shift of dominant electronic transitions and alternation of their character from π-to-π* to charge-transfer-type, when additionally accompanied by the high structural flexibility of a system, leading to changes in conformational preferences upon proton binding, produce particularly pronounced modifications of the spectral properties in acidic medium. The latter combined with reversibility of the read-out make some of the molecules in this series very promising multifunctional pH probes.
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  • 文章类型: Journal Article
    新疆阿魏(阿皮科)分布于新疆干旱的沙漠地区,其树脂是治疗消化道疾病的传统中药。为探索银杏的生物活性成分,分离出三种新的木脂素和13种已知成分。利用光谱分析和ECD计算建立了组分的结构阐明。Griess反应结果表明,新化合物1和2显著降低了LPS刺激的RAW264.7巨噬细胞中NO的产生,ELISA结果表明,它们通过抑制TNF-α有效减轻LPS诱导的炎症,IL-1β,和IL-6表达。计算机模拟方法证实化合物1以-5.84〜10.79kcal/mol的强结合能对接到受体中。此外,化合物6通过抑制细胞迁移和侵袭,抑制AGS胃癌细胞的增殖,IC50值为15.2μM。这项研究表明,新金鸡可能是生物活性成分的有希望的潜在资源。
    Ferula sinkiangensis K. M. Shen (Apiaceae) is distributed in arid desert areas of Xinjiang, and its resin is a traditional Chinese medicine to treat gastrointestinal digestive diseases. To explore bioactive components from F. sinkiangensis, three new lignans and thirteen known components were isolated. The structural elucidation of the components was established utilizing spectroscopic analyses together with ECD calculations. Griess reaction results indicated new compounds 1 and 2 significantly decreased NO production in LPS-stimulated RAW 264.7 macrophages, and ELISA results indicated that they effectively attenuated LPS-induced inflammation by inhibiting TNF-α, IL-1β, and IL-6 expressions. The in silico approach confirmed that compound 1 docked into the receptors with strong binding energies of -5.84~-10.79 kcal/mol. In addition, compound 6 inhibited the proliferation of AGS gastric cancer cells with IC50 values of 15.2 μM by suppressing the cell migration and invasion. This study disclosed that F. sinkiangensis might be a promising potential resource for bioactive components.
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  • 文章类型: Journal Article
    在这项工作中,介绍了三种高效圆偏振发光材料的物理机理。绘制了UV-vis光谱;使用跃迁密度矩阵(TDM)和电荷差密度(CDD)的组合研究了其电子在激发态下的跃迁性质;结合电子云的分布,阐述了三种结构中电荷转移激发的本质。计算了三种结构在S1和S2激发态下的共振拉曼光谱。M,M-4和M,通过电子圆二色性(ECD)光谱发现M-5结构产生新颖的手性,以及M的手性的原因,M-4和M,通过分析不同取向的跃迁电/磁偶极矩(TEDM/TMDMs)的密度,讨论了M-5结构。最后,M的拉曼光学活性(ROA),M-4和M,计算M-5,并绘制光谱。本研究将为碳基纳米材料在有机电子器件中的应用提供指导,太阳能电池,和光电子。
    In this work, the physical mechanisms of three highly efficient circularly polarized luminescent materials are introduced. The UV-vis spectra are plotted; the transition properties of their electrons at the excited states are investigated using a combination of the transition density matrix (TDM) and the charge difference density (CDD); combining the distribution of electron clouds, the essence of charge transfer excitation in three structures is explained. The resonance Raman spectrum of the three structures at the S1 and S2 excited states are calculated. The M, M-4 and M, M-5 structures are found to produce novel chirality by electronic circular dichroism (ECD) spectrum, and the reasons for the chirality of the M, M-4 and M, M-5 structures are discussed by analyzing the density of transition electric/magnetic dipole moments (TEDM/TMDMs) in different orientations. Finally, the Raman optical activity (ROA) of M, M-4, and M, M-5 are calculated, and the spectra are plotted. This study will provide guidance for the application of carbon-based nanomaterials in organic electronic devices, solar cells, and optoelectronics.
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  • 文章类型: Journal Article
    基于扩大标准供体(ECD)肾脏类型的肾移植候选人的生存结果未知。对在英国接受透析的所有等待上市的肾衰竭患者的前瞻性收集的登记数据进行了回顾性队列研究。纳入了2000-2019年间首次肾脏移植的所有患者。治疗类型包括;活体供体;标准标准供体(SCD);ECD60(年龄≥60岁的已故供体);ECD50-59(年龄在50-59岁的已故供体,以下三个人中有两个;高血压;肌酐升高和/或中风死亡)或仍在透析。主要结果是全因死亡率,使用时间依赖性非比例Cox回归模型分析从上市到死亡的时间。该研究队列包括47,917名等待列入肾衰竭患者,其中34,558人(72.1%)接受了肾脏移植。将ECD肾脏(n=7,356)分层为ECD60(n=7,009)或ECD50-59(n=347)。与SCD相比,ECD60(危险比1.126,95%CI1.093-1.161)和ECD50-59(危险比1.228,95%CI1.113-1.356)肾受者的全因死亡率均较高.然而,与透析相比,ECD60(危险比0.194,95%CI0.187-0.201)和ECD50-59(危险比0.218,95%CI0.197-0.241)肾移植受者的全因死亡率较低.ECD肾脏,不管定义如何,与剩余的等待名单相比,提供同等和优越的生存益处。
    Survival outcomes for kidney transplant candidates based on expanded criteria donor (ECD) kidney type is unknown. A retrospective cohort study was undertaken of prospectively collected registry data of all waitlisted kidney failure patients receiving dialysis in the United Kingdom. All patients listed for their first kidney-alone transplant between 2000-2019 were included. Treatment types included; living donor; standard criteria donor (SCD); ECD60 (deceased donor aged ≥60 years); ECD50-59 (deceased donor aged 50-59 years with two from the following three; hypertension; raised creatinine and/or death from stroke) or remains on dialysis. The primary outcome was all-cause mortality, with time-to-death from listing analyzed using time-dependent non-proportional Cox regression models. The study cohort comprised 47,917 waitlisted kidney failure patients, of whom 34,558 (72.1%) received kidney transplantation. ECD kidneys (n = 7,356) were stratified as ECD60 (n = 7,009) or ECD50-59 (n = 347). Compared to SCD, both ECD60 (Hazard Ratio 1.126, 95% CI 1.093-1.161) and ECD50-59 (Hazard Ratio 1.228, 95% CI 1.113-1.356) kidney recipients have higher all-cause mortality. However, compared to dialysis, both ECD60 (Hazard Ratio 0.194, 95% CI 0.187-0.201) and ECD50-59 (Hazard Ratio 0.218, 95% CI 0.197-0.241) kidney recipients have lower all-cause mortality. ECD kidneys, regardless of definition, provide equivalent and superior survival benefits in comparison to remaining waitlisted.
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  • 文章类型: Case Reports
    背景:Erdheim-Chester病(ECD)是一种罕见的组织细胞疾病,其特征是多系统黄色肉芽肿性浸润被脂质负载的组织细胞。我们报告了两例涉及眼眶的ECD病例,并描述了其临床病理因素,治疗,和预后。一例是罕见的ECD并发原发性血小板增多症。
    方法:本研究描述了两名双侧眼眶ECD患者。均表现为眼球突出和视力丧失;影像学发现显示双侧眶内肿块。两者均有不同程度的全身症状(胸腔积液,心包积液,腹水,和心力衰竭)之前出现眼部症状,并且在眼科肿瘤切除和病理活检之前未找到原因。经病理活检和检测BRAFV600E突变后确诊为ECD。患者2还患有原发性血小板增多症并且具有CALR突变以及BRAFV600E突变。建议两名患者接受靶向治疗。患者1出于经济原因拒绝靶向治疗,仅在局部放疗后出院。患者的两只眼睛都没有光感知,全身症状也没有改善。患者2在诊断后开始靶向治疗,2周后达到出院标准。他目前情况良好,但不幸的是,由于他的视觉功能受到不可逆转的损害,他的视力没有改善。
    结论:ECD罕见且临床表现多样,易误诊和漏诊。轨道受累在ECD中很常见,手术是最常用的方法。尽管手术切除并不能治愈,其意义在于活检以建立诊断和/或手术减积以减轻肿块效应,尽量减少视觉功能的进一步损害。靶向治疗是BRAF突变基因阳性患者最有效的治疗方法。在启动难治性ECD的靶向治疗之前,评估伴随的骨髓性肿瘤也至关重要。
    BACKGROUND: Erdheim-Chester disease (ECD) is a rare histiocytic disorder characterized by multisystem xanthogranulomatous infiltration by lipid-laden histiocytes. We report two cases of ECD involving the orbit and describe their clinicopathologic factors, treatments, and prognosis. One was a rare case of ECD complicated with primary thrombocytosis.
    METHODS: This study describes two patients with bilateral orbital ECD. Both presented with proptosis and visual loss; imaging findings showed bilateral intraorbital masses. Both had different degrees of systemic symptoms (pleural effusion, pericardial effusion, ascites, and heart failure) before the ocular symptoms and did not find the cause before ophthalmic tumor resection and pathological biopsy. The diagnosis of ECD was confirmed after pathological biopsy and detection of BRAFV600E mutation. Patient 2 also with primary thrombocytosis and had a CALR mutation as well as the BRAFV600E mutation. Both patients were recommended to receive targeted therapy. Patient 1 refused targeted therapy for financial reasons and was discharged after local radiotherapy only. The patient had no light perception in either eye and no improvement in systemic symptoms. Patient 2 began targeted treatment after diagnosis and reached the discharge criteria 2 weeks later. He is in good condition at present, but unfortunately, his eyesight has not improved because of the irreversible damage to his visual function.
    CONCLUSIONS: ECD is easily misdiagnosed and missed because of its rarity and diverse clinical manifestations. Orbital involvement is common in ECD, and surgery is the most frequently employed approach. Despite the surgical resection is not curative, its significance lies in biopsy to establish diagnosis and/or surgical debulking to relieve mass effect, minimizing further impairment of visual function. Targeted therapy is the most effective treatment for patients with a positive BRAF mutation gene. Evaluation of a concomitant myeloid neoplasm is also critical before initiating targeted therapies for refractory ECD.
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  • 文章类型: Journal Article
    使用DFT计算研究了二芳基-吡喃并苯并苯并苯并苯并苯并苯并苯并苯的动态情景。色烯支架的对称性和两个邻位取代的芳基取代基的存在可以产生具有不同旋转障碍的两种顺式/反非对映异构体和构象对映异构体。使用NOESY-1D实验得出相对构象和构型。根据与构象交换相关的能量,通过动态核磁共振确定实验能垒,动态HPLC或动力学研究。在后一种情况下,可解决对异向异构对的问题,并使用ECD/TD-DFT方法分配其绝对构型。
    The dynamic scenario of di-aryls-pyrano-chromenes was investigated using DFT calculations. The symmetry of the chromene scaffold and the presence of two ortho-substituted aryls substituents can generate two syn/anti diastereoisomers and conformational enantiomers with different rotational barriers. The relative conformations and configurations were derived using NOESY-1D experiments. Depending on the energies related to the conformational exchange, the experimental energy barriers were determined through Dynamic NMR, Dynamic HPLC or kinetic studies. The atropisomeric pairs were resolved in the latter scenario, and their absolute configuration was assigned using the ECD/TD-DFT method.
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  • 文章类型: Case Reports
    本报告调查了下颌后静脉在影像学上作为规划腮腺深叶肿瘤的诊断工具的用途。这种情况的一个独特方面是在腮腺深叶病变上进行囊外解剖,这是罕见的。术前影像学显示下颌后静脉表面移位,表明有一个深深的肿瘤,这有助于手术计划。在全身麻醉下,在保护面神经分支的同时进行囊外解剖。病人的术后过程是顺利的,面神经完好无损,没有弱点。
    This report investigates the use of the retromandibular vein on imaging as a diagnostic tool for planning deep lobe parotid tumors. A unique aspect of this case is the performance of extracapsular dissection on a deep lobe parotid lesion, which is rare. Preoperative imaging showed a superficially displaced retromandibular vein, indicating a deeply seated tumor, which aided surgical planning. Under general anesthesia, extracapsular dissection was performed while protecting the facial nerve branches. The patient\'s postoperative course was uneventful, and the facial nerve was intact with no weakness.
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