More Like this

1. Secondary structure of peptides mimicking the Gly-rich regions of major ampullate spidroin protein 1 and 2

   https://doi.org/10.1016/j.bpc.2022.106783  

   Gray, Geoffrey M.; Thiessen, Brittany; van der Vaart, Arjan (May 2022, Biophysical Chemistry)
2. J ‐modulated ¹⁹ F‐ and ¹ H‐detected dual‐optimized inverted ¹ J _CC 1,n‐ADEQUATE: A universal ADEQUATE experiment

   https://doi.org/10.1002/mrc.5324  

   Crouch, Ronald C; Pelmuş, Marius; Raab, Jeffrey G; Tischenko, Evgeny; Frey, Michael; Wang, Yunyi; Reibarkh, Mikhail; Williamson, R Thomas; Martin, Gary E (March 2023, Magnetic Resonance in Chemistry)

   Abstract The recently reported¹⁹F‐detected dual‐optimized inverted¹J_CC1,n‐ADEQUATE experiment and the previously reported¹H‐detected version have been modified to incorporateJ‐modulation, making it feasible to acquire all 1,1‐ and 1,n‐ADEQUATE correlations as well as¹J_CCandⁿJ_CChomonuclear scalar couplings in a single experiment. The experiments are demonstrated usingN,N‐dimethylamino‐2,5,6‐trifluoro‐3,4‐phthalonitrile andN,N‐dimethylamino‐3,4‐phthalonitrile. 

   more » « less
3. Calculated and experimental ¹ H and ¹³ C NMR assignments for cannabicitran

   https://doi.org/10.1002/mrc.5224  

   Wood, Jared_S; Gordon, William_H; Morgan, Jeremy_B; Williamson, R_Thomas (October 2021, Magnetic Resonance in Chemistry)

   Abstract Cannabicitran is an important cannabinoid natural product produced byCannabis sativaand is often found at surprisingly high levels (up to ~10%) in “purified” commercial cannabidiol (CBD) extract preparations. Despite the prevalence of this molecule in CBD oil and other cannabinoid‐related products, and the rapidly expanding interest in cannabinoids for treatment of a wide range of physiological conditions, only unassigned¹H NMR data and partial unambiguous¹³C assignments have been published. Herein, we report the complete¹H and¹³C NMR assignments of cannabicitran and comparatively evaluate the performance of several density functional theory (DFT) methods with varying levels of theory for the calculation of NMR chemical shifts. 

   more » « less
4. The EDGE-CALIFA Survey: Spatially Resolved ¹³ CO(1–0) Observations and Variations in ¹² CO(1–0)/ ¹³ CO(1–0) in Nearby Galaxies on Kiloparsec Scales

   https://doi.org/10.3847/1538-4365/acd840  

   Cao, Yixian; Wong, Tony; Bolatto, Alberto D.; Leroy, Adam K.; Rosolowsky, Erik; Utomo, Dyas; Sánchez, Sebastián F.; Barrera-Ballesteros, Jorge K.; Levy, Rebecca C.; Colombo, Dario; et al (August 2023, The Astrophysical Journal Supplement Series)

   Abstract We present¹³CO(J= 1 → 0) observations for the EDGE-CALIFA survey, which is a mapping survey of 126 nearby galaxies at a typical spatial resolution of 1.5 kpc. Using detected¹²CO emission as a prior, we detect¹³CO in 41 galaxies via integrated line flux over the entire galaxy and in 30 galaxies via integrated line intensity in resolved synthesized beams. Incorporating our CO observations and optical IFU spectroscopy, we perform a systematic comparison between the line ratio ${\mathit{}}_{12/13}\equiv I{[}^{12}\mathrm{CO}(J=1\to 0)\left]/I{[}^{13}\mathrm{CO}\right(J=1\to 0\left)\right]$and the properties of the stars and ionized gas. Higher ${\mathit{}}_{12/13}$values are found in interacting galaxies compared to those in noninteracting galaxies. The global ${\mathit{}}_{12/13}$slightly increases with infrared colorF₆₀/F₁₀₀but appears insensitive to other host-galaxy properties such as morphology, stellar mass, or galaxy size. We also present azimuthally averaged ${\mathit{}}_{12/13}$profiles for our sample up to a galactocentric radius of 0.4r₂₅(∼6 kpc), taking into account the¹³CO nondetections by spectral stacking. The radial profiles of ${\mathit{}}_{12/13}$are quite flat across our sample. Within galactocentric distances of 0.2r₂₅, the azimuthally averaged ${\mathit{}}_{12/13}$increases with the star formation rate. However, Spearman rank correlation tests show the azimuthally averaged ${\mathit{}}_{12/13}$does not strongly correlate with any other gas or stellar properties in general, especially beyond 0.2r₂₅from the galaxy centers. Our findings suggest that in the complex environments in galaxy disks, ${\mathit{}}_{12/13}$is not a sensitive tracer for ISM properties. Dynamical disturbances, like galaxy interactions or the presence of a bar, also have an overall impact on ${\mathit{}}_{12/13}$, which further complicates the interpretations of ${\mathit{}}_{12/13}$variations. 

   more » « less
5. Unusual η ¹ ‐Coordinated Alkyne and Alkene Complexes

   https://doi.org/10.1002/chem.201903824  

   Li, Longfei; Dong, Mengxian; Zhu, Hua‐Jie; Peng, Bin; Xie, Yaoming; Schaefer, Henry F. (December 2019, Chemistry – A European Journal)