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1.
Spectrochim Acta A Mol Biomol Spectrosc ; 273: 121030, 2022 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-35189488

RESUMO

Silver nanowires (AgNWs) as a promising surface-enhanced Raman spectroscopy (SERS) substrate could be used in the analytical science due to its high sensitivity. However, it is difficult for the randomly-distributed silver nanowires to offer uniform "hot spots" to achieve the SERS signal reproducibility of small molecules detection. Herein, the evaporation-induced aggregation had been used to assemble long silver nanowires into highly aligned structure to achieve uniform "hot spots" for SERS detection. The normal glass slide with well-aligned silver nanowires could act as a high sensitivity and excellent reproducibility SERS substrate to provide a versatile platform for detecting analytes. Rhodamine 6G (R6G) is used to evaluate the sensitivity and reproducibility of these AgNWs SERS substrates. Even the low concentration of the R6G was 10-10 mol/L, the SERS features of R6G could be still observed clearly, and the uniform distribution of enhancement factor (EF) was higher than 0.8 × 104 accounting for about 75 % in the observed mapping area. Moreover, the relative standard deviation (RSD) of SERS intensity at the band of 610 cm-1 was used to estimate the signal reproducibility, and the calculated RSD value of aligned AgNWs substrate was about 3.6%, which was much higher than that of the randomly distributed AgNWs (26.8%) because of the highly aligned structure of silver nanowires with abundant and uniform inherent "hot spots". In addition, potential SERS detection of other small molecule, e.g. melamine was also demonstrated in the micromolar range.


Assuntos
Nanofios , Prata , Vidro , Nanofios/química , Reprodutibilidade dos Testes , Prata/química , Análise Espectral Raman/métodos
2.
Yi Chuan Xue Bao ; 32(11): 1221-6, 2005 Nov.
Artigo em Chinês | MEDLINE | ID: mdl-16318289

RESUMO

Streptomycetes are Gram-positive, soil-inhabiting bacteria of Actinomycetales. These organisms exhibit complex life cycle and secondary metabolic pathways, and produce many economically important secondary metabolites. This review presented recent progress in Streptomycetes chromosome structure,genomics and the research of secondary metabolic pathway in Streptomyces. As more genomic sequences become available, it wiil be greatly facilitated to elucidate metabolic and regulatory networks and gain the over-production of desired metabolites or create the novel production of commercially important compounds.


Assuntos
Genoma Bacteriano , Streptomyces , Genômica , Metabolismo , Streptomyces/química , Streptomyces/genética , Streptomyces/metabolismo
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