Article
Multidisciplinary Sciences
Dihao Wang, Olivia C. Fiebig, Dvir Harris, Hila Toporik, Yi Ji, Chern Chuang, Muath Nairat, Ashley L. Tong, John I. Ogren, Stephanie M. Hart, Jianshu Cao, James N. Sturgis, Yuval Mazor, Gabriela S. Schlau-Cohen
Summary: In photosynthesis, absorbed light energy is efficiently transferred through a network of antenna proteins to reach the reaction center. The dynamics of energy transfer between proteins have been poorly understood due to the heterogeneous organization of the network. This study successfully isolated and investigated the interprotein energy transfer dynamics using advanced spectroscopy and microscopy techniques.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Biochemistry & Molecular Biology
Andrew J. Lee, Masayuki Endo, Jamie K. Hobbs, A. Giles Davies, Christoph Walti
Summary: The study used DNA nanostructure-augmented high-speed AFM to directly observe the RecA-orchestrated alignment of homologous DNA strands, revealing transient sampling of micro-homology by RecA during the search for sequence alignment. These transient interactions are early steps in the search for sequence homology.
NUCLEIC ACIDS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Gethmini K. Jayasekara, Cali Antolini, Melissa A. Smith, Danielle J. Jacoby, Jacqueline Escolastico, Nathan Girard, Benjamin T. Young, Dugan Hayes
Summary: The mechanism of Cu(I)-catalyzed intermolecular photocycloaddition reaction using norbornene and cyclohexene as model substrates was elucidated using a combination of optical and X-ray transient absorption spectroscopies. The study revealed distinct reaction pathways for the two substrates, shedding light on the role of metal-to-ligand charge transfer and product formation in the reactions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Nathan A. Turner, Jason G. Mance, Klaus Attenkofer, Bernhard W. Adams, Xiaoyi Zhang, Susan L. Dexheimer
Summary: In this study, optical pump/X-ray absorption probe techniques were used to investigate changes in electronic distribution and local structure upon formation of a self-trapped exciton in the mixed-valence halide-bridged transition metal linear chain material [Pt(en(2))][Pt(en(2))Cl-2]·(ClO4)4. The experiments revealed photoinduced changes in the Pt L-m XANES spectrum on a picosecond time scale, with ab initio FEFF9 modeling providing insights into the electronic redistribution and local lattice distortions associated with the strong localization of the self-trapped state.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Agricultural Engineering
Janne Spanoghe, Pieter Vermeir, Siegfried E. Vlaeminck
Summary: This research explores the potential of purple bacteria to produce microbial protein, finding that three tested species have high growth rates and protein productivity, potentially faster and more productive than microalgae. The protein produced by these purple bacteria is nutritionally beneficial for humans, with a high content of vaccenic acid.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Kazuhiro J. Fujimoto, Takumi Minoda, Takeshi Yanai
Summary: This study theoretically investigates excited states of two types of bacteriochlorophyll aggregates in photosynthetic light-harvesting complexes, revealing that the spectral redshift of B800 is mainly due to electrostatic interaction while that of B850 is attributed to excitonic coupling. Additionally, interchromophore charge transfer plays a crucial role in the spectral redshift of B850.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Physical
Julian Hniopek, Carolin Mueller, Thomas Bocklitz, Michael Schmitt, Benjamin Dietzek, Juergen Popp
Summary: This study presents, for the first time, a systematic investigation on the use of 2D correlation analysis in the field of femtosecond transient absorption spectroscopy. The results demonstrate that TA-2DCOS is a model-free approach that can effectively analyze excited state kinetics in fs-TA data sets, offering potential as an alternative method to traditional approaches.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Biology
Ekaterina Petushkova, Ekaterina Mayorova, Anatoly Tsygankov
Summary: Purple non-sulfur bacteria are promising producers of biofuels, capable of utilizing organic waste waters to produce valuable compounds. Understanding their anaplerotic pathways is crucial for utilizing them as potential biofuel producers.
Article
Chemistry, Applied
Yixiao Wang, Bingwen Wang, Sagar Sourav, Rakesh Batchu, Zongtang Fang, M. Ross Kunz, Gregory Yablonsky, Eranda Nikolla, Rebecca Fushimi
Summary: In this study, the influence of surface and gas phase oxygen on the selective conversion of CH4 to C2H4 over the Mn-Na2WO4/SiO2 catalyst was investigated using Temporal Analysis of Products (TAP) and steady-state experiments. It was found that methane activation predominantly occurs via a short-lived, transient surface oxygen species on the catalyst, and there is competition between this species to form CO or methyl radicals on the surface. The concentration of the transient surface oxygen species was found to significantly impact the oxidative coupling of methane performance.
Article
Geosciences, Multidisciplinary
Zongheng Li, Jun Peng, Lifeng Zhang
Summary: This study investigates the impact of convective parameterizations (CPs) on atmospheric mesoscale kinetic energy spectra and finds that there is a complementary relationship between CP and microphysical parameterization (MP). The less latent heat is released by CP, the more is released by MP, resulting in stronger vertical motion and shallower energy spectra.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Olga Petrovna Serdyuk, Azat Vadimovich Abdullatypov, Lidiya Dmitrievna Smolygina, Aleksandr Aleksandrovich Ashikhmin, Maxim Alexandrovich Bolshakov
Summary: A novel peripheral light-harvesting (LH) complex LL LH2, along with LH4 complex, was isolated from Rhodopseudomonas palustris cells grown under low light intensity (LL). FPLC-MS/MS analysis revealed the presence of PucABd and PucBabc apoproteins in LL LH2 complex, which differed from the previously described LH4 complex. The main carotenoids in LL LH2 complex were rhodopin and 3,4-didehydrorhodopin. Differences in protein and carotenoid composition, as well as the lower energy transfer efficiency from carotenoids to bacteriochlorophyll a in LL LH2 compared to LH4, suggest that LL LH2 is a novel type of light-harvesting complex in Rhodopseudomonas palustris.
Article
Plant Sciences
Masayuki Morimoto, Haruna Hirao, Masaharu Kondo, Takehisa Dewa, Yukihiro Kimura, Zheng-Yu Wang-Otomo, Hitoshi Asakawa, Yoshitaka Saga
Summary: The study used atomic force microscopy to analyze the ring structure of LH2 in Thermochromatium tepidum, finding that it consists of eight repeating subunits. This is consistent with the octameric ring structure of LH2 in Phaeospirillum molischianum.
PHOTOSYNTHESIS RESEARCH
(2023)
Article
Chemistry, Physical
Andrei Razjivin, Jan Goetze, Evgeny Lukashev, Vladimir Kozlovsky, Aleksandr Ashikhmin, Zoya Makhneva, Andrey Moskalenko, Heiko Lokstein, Vladimir Paschenko
Summary: The study investigated the excitation energy transfer from bacteriochlorophyll to carotenoids in pigment-protein complexes of purple bacteria, showing that the efficiency of this transfer process was very low.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Multidisciplinary
Tao Wu, Petr Bour, Tomotsumi Fujisawa, Masashi Unno
Summary: Raman optical activity (ROA) of chiral europium complexes was successfully measured using near-infrared laser excitation, avoiding the interference of circularly polarized luminescence (CPL). This technique allows for the detection of multiple vibrational bands, providing rich structural information about the ligand and metal core. The combination of ROA experimental data and density functional theory (DFT) simulations enables the determination of absolute configuration of chiral lanthanide compounds in solution.
Article
Plant Sciences
Marina G. Strakhovskaya, Eugene P. Lukashev, Boris N. Korvatovskiy, Ekaterina G. Kholina, Nuranija Kh. Seifullina, Peter P. Knox, Vladimir Z. Paschenko
Summary: The study showed that cationic antiseptics can reduce the efficiency of light energy conversion in chromatophore membranes, especially affecting the interaction between the LH2 and LH1 complexes. The molecules of cationic antiseptics bind to the negatively charged cardiolipin molecules on the cytoplasmic surface of chromatophores, disrupting optimal conditions for efficient energy migration.
PHOTOSYNTHESIS RESEARCH
(2021)
