5 research outputs found
Estimate of the secondary structure in MALT1<sub>Casp-Ig3</sub>(338–719).
<p>Secondary chemical shifts (Δδ) were calculated by subtracting random coil chemical shifts corrected for nearest-neighbour effects from <sup>13</sup>C’, <sup>13</sup>Cα and <sup>13</sup>Cβ chemical shifts corrected for deuterium isotope shifts. Consecutive values above 0.7 indicates alpha helix, while consecutive values below -0.7 indicates beta strand for Δδ<sup>13</sup>C’ and Δδ<sup>13</sup>Cα. The opposite is true for Δδ<sup>13</sup>Cβ. The CSI for the three nuclei were averaged and reported as a “consensus” CSI. β3, β3A and β3B are denoted β3 AB in the Fig. The star (*) indicates that the secondary structure is part of the Ig3 domain.</p
Peak appearance progress during the course of the TA procedure for the MALT1 sample.
<p>The horizontal axis shows the total measurement time excluding the HNCO experiment, which was recorded prior to the TA. The spectral processing and analysis was done automatically during the course of the data acquisition.</p
<sup>1</sup>H-<sup>15</sup>N TROSY spectrum of MALT1<sub>Casp-Ig3</sub>(338–719) with the assigned amino acid residue number annotated.
<p><sup>1</sup>H-<sup>15</sup>N TROSY spectrum of MALT1<sub>Casp-Ig3</sub>(338–719) with the assigned amino acid residue number annotated.</p
Estimated secondary structure from NMR experiments (in black) compared to secondary structure from the in-house X-ray structure (in dark grey) and from the published X-ray structure of <i>apo</i> MALT1<sub>Casp-Ig3,</sub> PDB ID: 3V55 (in light grey).
<p>Alpha helices are indicated with a greater symbol size than the beta-sheets. β3, β3A and β3B are denoted β3 AB in the Fig. The star (*) indicates that the secondary structure is part of the Ig3 domain.</p
Revealing Chemical Heterogeneity of CNT Fiber Nanocomposites via Nanoscale Chemical Imaging
Lightweight nanocomposites
reinforced with carbon nanotube (CNT)
assemblies raise the prospects for a range of high-tech engineering
applications. However, a correlation between their heterogeneous chemical
structure and spatial organization of nanotubes should be clearly
understood to maximize their performance. Here, we implement the advanced
imaging capabilities of atomic force microscopy combined with near-field
infrared spectroscopy (AFM-IR) to analyze the intricate chemical structure
of CNT fiber-reinforced thermoset nanocomposites. As an example, we
unravel the chemical composition of a nanothin polymer interphase
exclusively from CNT assemblies and visualize in a two- and three-dimensional
format with resolution of sub-30 nm. We furthermore introduce a contact
frequency map colocalized with CNTs and surrounding polymer, which
might correlate the local mechanical properties with polymer chemistry
and the high anisotropy of CNTs. Nanoresolved chemical imaging offers
possibilities for in-depth characterization of next-generation composite
materials and devices based on CNT assemblies interacting with a certain
chemical environment