Results 21 to 30 of about 10,187 (206)
ABSTRACT The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng +6 more
wiley +1 more source
ABSTRACT The high accuracy in surface‐enhanced Raman scattering‐lateral flow immunoassays (SERS–LFIAs) is critical for reliable point‐of‐care testing (POCT) in clinical diagnostics. Conventional approaches are often affected by sampling variability and uneven distribution of immunoprobes, leading to unreliable signal fluctuations.
Shuai Zhao +9 more
wiley +1 more source
Chemical constituents from Wedelia prostrata and their cytotoxicity activity [PDF]
卤地菊(Wedeliaprostrata(Hook.etArn.)Hemsl.)为菊科蟛蜞菊属植物。对蟛蜞菊属植物研究调查表明,其主要含有二萜,倍半萜,黄酮和有机酸等化学成分。二萜尤其是对映-贝壳杉二萜类是蟛蜞菊属植物的主要活性成分,具有抗菌、抗病毒、抗氧化、抗癌、抗血管生成等生物活性。 本文首先用石油醚、乙酸乙酯、正丁醇三种不同极性的溶剂依次对卤地菊的乙醇提取物进行萃取,初步得到三个萃取部位,对卤地菊石油醚部位进行系统的化学成分研究,采用硅胶柱层析、聚酰胺柱层析、葡聚糖凝胶柱层析 ...
林剑虹
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Graphical abstract AbstractThe studies on the synthesis of two‐dimensional (2D) Janus materials have made significant progress over the years. They offer new opportunities to increase the potential usage of Janus transition metal dichalcogenide (TMDC) materials in different application areas due to their unique structural, electrical, optical and ...
Ayça Coşkun +9 more
wiley +1 more source
Explore the Raman instruments and methods for high sensitivity, on-line detection and miniaturization [PDF]
仪器是自然科学研究的重要工具,是科学研究的基础条件。科学技术的飞 速发展对仪器提出了越来越高的要求,不断的有新技术,新材料被用于科学仪 器的研发。反过来,科学仪器的发展水平也决定了科学研究的水平。“工欲善其 事,必先利其器”,仪器方法的研究本身也是一个重要的科学门类。它的特点和 难点在于要用多学科的技术来解决某一学科的尖端难题。目前,我们国家大部 分高档科学仪器依赖进口,而某些研究需要对仪器进行改装或自主搭建则困难 重重,一方面仪器厂商定制仪器价格十分高昂,而且定制仪器需要反复修改, 一般企业很难做到 ...
汪安
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This study provides an innovation to address the challenge in accessibility to samples and genetic markers in Snow leopard conservation genetic studies. We performed next‐generation sequencing (NGS) on 19 fecal samples obtained from the eastern Qinghai‐Tibet Plateau, and successfully assembled 17 complete mitogenome sequences (~16,720 bp) and ...
Chen Cheng +7 more
wiley +1 more source
Dynamic Raman imaging system of high spatio-temporal resolution and Its key technologies [PDF]
拉曼光谱技术由于其无损、非接触、不受水分子干扰等特点而广泛应用于各个领域,其中显微拉曼光谱技术已发展成为微区检测、化学分析方面强有力的工具。然而目前大多数显微拉曼光谱仪的拉曼扫描成像速度仍无法满足电化学反应过程动态监测的要求。本文研究结合“适用于高时空分辨原位电化学显微拉曼光谱仪的研制及其应用研究”项目的目标和要求,通过集成拉曼扫描成像技术和宽场拉曼成像技术,构建具有高时空分辨特性的动态拉曼成像系统。在显微拉曼光谱仪具有的高空间分辨率的基础上,进一步提高成像系统的时间分辨,从而实现动态拉曼信号的检测 ...
戴吟臻
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Environmental niche models improve species identification in DNA barcoding
Abstract Recent advances in DNA barcoding have immeasurably advanced global biodiversity research in the last two decades. However, inherent limitations in barcode sequences, such as hybridization, introgression or incomplete lineage sorting can lead to misidentifications when relying solely on barcode sequences.
Cai‐qing Yang +6 more
wiley +1 more source
Applications of nuclear magnetic resonance spectroscopy and Raman spectroscopy in the studies of hepatic cancer and nasopharyngeal carcinoma [PDF]
癌症是全人类共同面临的健康问题。在我国东南沿海地区,肝细胞性肝癌(hepatocellularcarcinoma,HCC)和鼻咽癌(nasopharyngealcarcinoma,NPC)形势尤为紧迫。当前针对HCC和NPC的诊疗手段因受各种因素影响而作用十分有限。针对区域性重要恶性肿瘤疾病的实验研究和临床需求出发,本文利用核磁共振波谱、拉曼光谱和表面增强拉曼光谱等技术分别研究HCC和NPC的血液、细胞株以及亚细胞组分等生化样本的谱学特征,结合多种统计学方法从诊、疗两个层面探索相关的生物标记物 ...
陈阳
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Construction of Raman spectroscopy system and implementation of algorithm based on shifted excitation method [PDF]
拉曼光谱技术作为一种强有力的分子结构研究工具,广泛应用于材料物理、生物医学、食品安全等领域。然而很多物质比如药品、食品的拉曼光谱检测过程都伴有强荧光干扰,荧光的存在严重影响拉曼光谱特征峰的识别,此外探测器本身的噪声和暗电流严重影响着弱拉曼特征峰的探测,因此非常有必要采取措施抑制荧光干扰和提高拉曼光谱系统的信噪比。 移频激发法是一种简单通用的荧光抑制方法,它常采用两个波长相近的激发光源分别激发样品得到两幅拉曼光谱,对这两幅光谱作差分,从而有效地消除荧光的影响。本文研究了移频激发法的荧光抑制原理 ...
吴景林
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