Local Dielectric Environment Dependent Local Electric Field Enhancement in Double Concentric Silver Nanotubes

The local dielectric environment dependent local field enhancement properties in double concentric silver nanotubes have been obtained by using the plasmon hybridization method and quasi-static calculation. Because of the inserted silver nanotube, the geometrical parameter controlled intertube coupling greatly improves the tunability of the local dielectric dependent enhancement of local electric field. In the inner dielectric core, the most intense local field factor peak corresponds to the |ω_–⁺⟩ plasmon mode, and the major local field factor peak usually changes nonmonotonously as the inner core or spacer layer dielectric is increased. The maximum local field could be obtained by fine-tuning the local dielectric constant in the double tubes with thick inner and outer tube thickness. In the dielectric spacer layer, the most intense local field factor peak corresponds to the |ω_–^–⟩ plasmon mode. The intense local field could be obtained with small spacer layer dielectric constant and reaches the maximum value when the double tube has thick inner and outer tube thickness. This inner core and spacer layer dielectric dependent local field enhancement provides the potential application of the real time tubular nanosensor based on local field induced fluorescence enhancement and surface-enhanced Raman scattering (SERS)

Small and Sharp Triangular Silver Nanoplates Synthesized Utilizing Tiny Triangular Nuclei and Their Excellent SERS Activity for Selective Detection of Thiram Residue in Soil

The great harm of thiram residue in soil to environment and human health is usually ignored. Due to the complexity of soil compositions, the detection of thiram residue in soil faces considerable difficulties. In this work, a highly sensitive and selective surface-enhanced Raman scattering (SERS) substrate based on the triangular silver nanoplates (TSNPs) with small size and sharp corners is developed and used for the detection of thiram residue in soil for the first time. These TSNPs are synthesized by replacing the conventional seeds in the seed-mediated chemical reduction route with the tiny and uniform triangular silver nuclei (TSN) which can provide more growing space for generating sharp corners during the growth of TSNPs. It is interesting that the TSNPs with the smaller size have the better SERS performance. The possible mechanism behind this phenomenon is explained by the electromagnetic enhancement theory. On the basis of the Raman activity of the smallest TSNPs, a SERS-active substrate is prepared for detecting the thiram residue in soil. The thiram solution detection shows that the limit of detection (LOD) of these smallest TSNPs is lower than other nanoparticles, such as nanospheres, nanocubes, etc. For sensing the thiram residue in soil, the addition of poly­(sodium 4-styrenesulfonate) realizes the specific adsorption of thiram by TSNPs. This method exhibits a good linear response from 0.12 to 4.8 μg/g with a low LOD of 90 ng/g, which is better than conventional methods. This work shows the great potential of the small TSNPs as a novel SERS substrate and its broader applications in pesticides detection

Additional file 4: of Heterologous expression and biochemical characterization of a GHF9 endoglucanase from the termite Reticulitermes speratus in Pichia pastoris

SDS-PAGE analysis of overexpressed pJL36A, pJl36C and pJL36E over different time intervals. (DOCX 1251 kb

Additional file 3: of Heterologous expression and biochemical characterization of a GHF9 endoglucanase from the termite Reticulitermes speratus in Pichia pastoris

SDS-PAGE analysis of overexpressed pJL36A, pJl36C, pJL36E, pJL36G and pJL36I after induced for 72 h. (DOCX 577 kb

Additional file 1: of Heterologous expression and biochemical characterization of a GHF9 endoglucanase from the termite Reticulitermes speratus in Pichia pastoris

Sequence alignment of biochemically characterized insect-origin GHF9 endocellulases. (DOCX 535 kb

MOESM3 of Structure-oriented substrate specificity engineering of aldehyde-deformylating oxygenase towards aldehydes carbon chain length

Additional file 3. Relative activity of WT and cADO mutants against different substrates

Additional file 5: of Identification of residues important for the activity of aldehyde-deformylating oxygenase through investigation into the structure-activity relationship

Original data for determination of the kinetic parameters. (DOCX 367 kb

Additional file 5: of Identification of residues important for the activity of aldehyde-deformylating oxygenase through investigation into the structure-activity relationship

Original data for determination of the kinetic parameters. (DOCX 367 kb

Univariable meta regression analysis for heterogeneity under the additive model.

<p>CA, coronary angiography; HWE, Hardy-Weinberg equilibrium; RFLP, restriction fragment length polymorphisms.</p

Description of search strategy for electronic databases.

<p>Description of search strategy for electronic databases.</p