More Like this

1. $$\mathbb {A}^1$$ A 1 -connected varieties of rank one over nonclosed fields

   https://doi.org/10.1007/s00208-015-1257-1  

   Chen, Qile; Zhu, Yi (April 2016, Mathematische Annalen)
2. Influence of supercell size on Gas-Surface Scattering: A case study of CO scattering from Au(1 1 1)

   https://doi.org/10.1016/j.chemphys.2021.111423  

   Hu, Ce; Lin, Qidong; Guo, Hua; Jiang, Bin (February 2022, Chemical Physics)
3. Is the A-1 Pigment in Photosystem I Part of P700? A (P700+–P700) FTIR Difference Spectroscopy Study of A-1 Mutants

   https://doi.org/10.3390/ijms25094839  

   Kirpich, Julia S; Luo, Lujun; Nelson, Michael R; Agarwala, Neva; Xu, Wu; Hastings, Gary (May 2024, International Journal of Molecular Sciences)

   The involvement of the second pair of chlorophylls, termed A-1A and A-1B, in light-induced electron transfer in photosystem I (PSI) is currently debated. Asparagines at PsaA600 and PsaB582 are involved in coordinating the A-1B and A-1A pigments, respectively. Here we have mutated these asparagine residues to methionine in two single mutants and a double mutant in PSI from Synechocystis sp. PCC 6803, which we term NA600M, NB582M, and NA600M/NB582M mutants. (P700+–P700) FTIR difference spectra (DS) at 293 K were obtained for the wild-type and the three mutant PSI samples. The wild-type and mutant FTIR DS differ considerably. This difference indicates that the observed changes in the (P700+–P700) FTIR DS cannot be due to only the PA and PB pigments of P700. Comparison of the wild-type and mutant FTIR DS allows the assignment of different features to both A-1 pigments in the FTIR DS for wild-type PSI and assesses how these features shift upon cation formation and upon mutation. While the exact role the A-1 pigments play in the species we call P700 is unclear, we demonstrate that the vibrational modes of the A-1A and A-1B pigments are modified upon P700+ formation. Previously, we showed that the A-1 pigments contribute to P700 in green algae. In this manuscript, we demonstrate that this is also the case in cyanobacterial PSI. The nature of the mutation-induced changes in algal and cyanobacterial PSI is similar and can be considered within the same framework, suggesting a universality in the nature of P700 in different photosynthetic organisms. 

   more » « less
4. Synthetic U(1) gauge invariance in a spin-1 Bose gas

   https://doi.org/10.1103/PhysRevResearch.4.L042018  

   Gao, Chunping; Liu, Jinghu; Chang, Maolin; Pu, Han; Chen, Li (November 2022, Physical Review Research)
5. Crystal structure of a (carboxymethyl)triethylazanium bromide–2-(triethylazaniumyl)acetate (1/1) hydrogen-bonded dimer

   https://doi.org/10.1107/S2056989023006850  

   Carlson, Faith M; Staples, Richard J; Biros, Shannon M (September 2023, Acta Crystallographica Section E Crystallographic Communications)

   The title compound, C₈H₁₈NO₂⁺·Br⁻·C₈H₁₇NO₂, crystallizes as the bromide salt of a 50:50 mixture of (triethylazaniumyl)carboxylic acid and the zwitterionic (triethylazaniumyl)carboxylate. The two organic entities are linked by a half-occupied bridging carboxylic acid hydrogen atom that is hydrogen-bonded to the carboxylate group of the second molecule. The tetralkylammonium group adopts a nearly perfect tetrahedral shape around the nitrogen atom with bond lengths that agree with known values. The carboxylic acid/carboxylate group is orientedantito one of the ethyl groups on the ammonium group, and the carbonyl oxygen atom is engaged in intramolecular C—H...O hydrogen bonds. 

   more » « less