Article
Plant Sciences
Zsolt Gulyas, Blanka Moncsek, Kamiran Aron Hamow, Pal Straner, Zoltan Tolnai, Eszter Badics, Norbert Incze, Eva Darko, Valeria Nagy, Andras Perczel, Laszlo Kovacs, Vilmos Soos
Summary: This study characterizes D27-LIKE1 in Arabidopsis and highlights its important physiological and enzymatic functions related to carotenoids. The results show that D27-LIKE1 has multi-substrate specificity and may regulate carotenoid cis pools and the biosynthesis pathways of strigolactones and ABA.
Article
Chemistry, Applied
Jolanta Konieczkowska, Mariola Siwy
Summary: This work investigates the thermal cis-trans isomerization in solid-state for poly(ether imide)s and poly(ester imide)s with azobenzene or azo pyridine moieties. The study explores the relationship between various material aspects such as polyimide structure, molar mass, azo dye content, d-spacing value, polymer film thickness, and thermal cis-trans isomerization. The reversibility of the trans-cis-trans reaction was studied using different irradiation wavelengths. This is the first comprehensive article on solid-state cis-trans isomerization for azo polyimides.
Article
Physics, Fluids & Plasmas
Izabela Sliwa, Pavel Maslennikov, Alex Zakharov
Summary: A molecular model is proposed to describe the effective anchoring energy of a liquid crystal system. The model explains the mechanism behind the anchoring transition caused by structural changes in the photosensitive azobenzene layer.
Article
Chemistry, Multidisciplinary
Zhao Gao, Fei Yan, Lulu Shi, Yifei Han, Shuai Qiu, Juan Zhang, Feng Wang, Si Wu, Wei Tian
Summary: Photoisomeric supramolecular assemblies have been a hot topic in recent years. In general, the photoisomerization process from irregular aggregates to regular assemblies leads to the destruction of assemblies. However, through the conversion from planar to nonplanar photoisomer, a converse sol-to-gel transition has been achieved. A well-designed acylhydrazone-linked monomer, with imine for trans-cis interconversion and amide for intermolecular hydrogen bonding, is used to drive the photoisomerization-induced self-assembly. The counterintuitive sol-to-gel transition is attributed to the partial trans->cis photoisomerization of acylhydrazone, which changes the stacking mode of monomers. This reversible phase transition also holds potential for miniature materials, as demonstrated in the formation of in situ valves in microfluidic devices.
Article
Polymer Science
Alex Abramov, Binoy Maiti, Ina Keridou, Jordi Puiggali, Oliver Reiser, David Diaz Diaz
Summary: A novel methodology for pH-triggered degradation of polymers or drug release under visible light irradiation is described, based on the cyclization of ortho-hydroxy-cinnamates (oHC) to coumarins. The key oHC structural motif can be easily incorporated into the rational design of novel photocleavable polymers via click chemistry, with rapid photocleavage under 455 nm light irradiation when a suitable base is added.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Huan-Hua Xu, Liang Yang, Ming-Xia Tang, An-Ping Ye, Bo-Dan Tu, Zhen-Hong Jiang, Jian-Feng Yi
Summary: This study found that the degree of isomerization of lobeline has a significant impact on its respiratory excitatory effects. The respiratory excitatory effect was significantly reduced with the administration of trans-lobeline injections compared to cis-lobeline injections. The study also discovered that isomerization is a one-way reaction catalyzed by temperature, with pH as the key factor. Lobeline, as a nonselective antagonist with high affinity for nicotinic acetylcholine receptors, has shown potential in the treatment of addiction and nervous system disorders.
Article
Chemistry, Physical
Taposi Chatterjee, Ersad Hossain, Samim Khan, Sourav Roy, Saikh Mohammad Wabaidur, Md Ataul Islam, Seikh Mafiz Alam, Mohammad Hedayetullah Mir
Summary: A Zn(II) based two-dimensional metal-organic framework (MOF) 1 has been synthesized by a slow diffusion method. Compound 1 exhibits photoluminescence property and undergoes in situ cis,cis- to cis,trans-isomerization under visible light. Non-covalent interactions within compound 1 have been investigated using Hirshfeld surface analysis.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Xia Yu, Yuzhang Meng, Hao Zhang, Junbo Guo, Shixian Wang, Hui Li, Jun Hu, Min-Hui Li
Summary: This study synthesized and characterized two pure stereoisomers, trans- and cis-TPE-2GA, which exhibited different aggregation-induced emission, self-assembly properties, and crystallinity. The cis-TPE-2GA showed mechano-chromic properties and a lower energy gap, higher quantum yield, and longer lifetime compared to trans-TPE-2GA, explaining their differences in fluorescence and mechano-chromic properties.
Article
Chemistry, Multidisciplinary
Aidan Kerckhoffs, Isabelle Moss, Matthew J. Langton
Summary: Photo-switchable receptors with spatial and temporal precision enable control over the binding and release of guests. In this study, the first halogen bonding photo-switchable anion receptors are reported, in which chloride binding can be reversibly modulated by irradiation with red and blue light. The Z isomer shows over a 50-fold enhancement in chloride binding affinity. This switchable binding enables unprecedented photo-controlled catalysis of XB-mediated halide abstractions and a Mukaiyama Aldol reaction.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Isabella C. D. Merritt, Denis Jacquemin, Morgane Vacher
Summary: This study revisits the cis -> trans photo-isomerisation mechanism of azobenzene using high-level ab initio surface hopping mixed quantum-classical dynamics. Results show a reduction of photoisomerisation quantum yield on exciting to the higher energy pi pi* state compared to the lower energy n pi* state. The explanation for the decrease in quantum yield is found to be different from that observed in the trans -> cis photoisomerisation scenario.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Kritika Kumari, Marina Warepam, Aniket Kumar Bansal, Tanveer Ali Dar, Vladimir N. Uversky, Laishram Rajendrakumar Singh
Summary: TMAO is a significant metabolite derived from various organic compounds, with diverse biological functions in humans. Studies have shown its crucial impact on protein folding and cell cycle, potentially leading to protein misfolding and the development of related diseases.
CELLULAR AND MOLECULAR LIFE SCIENCES
(2022)
Article
Food Science & Technology
Chongyun He, Likang Qin, Jianmei Yang, Yong Zhu
Summary: The regularity of cis-trans isomerization of unsaturated fatty acids in camellia oil under heating was explored through fatty acid profile evolution and reaction kinetics. The temperatures for generating mono-trans linoleic acids and linolelaidic acid were significantly higher than that of elaidic acid. The total trans fatty acids content increased with heating temperature. The study also calculated the activation energy of the cis-trans isomerization reactions, which provides valuable information for inhibiting trans fatty acid formation during camellia oil processing.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Organic
Pritha Das, Megan Despain, Avery Ethridge, Jimmie D. Weaver III
Summary: A method for the contra-thermodynamic protection and thermodynamic deprotection of alcohols is reported, where all reagents are returned to their original state. This is achieved by using visible light photochemical energy to drive the formation of highly strained trans-(Z)-cyclohexene. The product ethers have more potential energy than the starting materials at STP, allowing them to be catalytically returned to the starting materials, effectively realizing a protection-deprotection scheme paid for with an energy currency.
Article
Biochemistry & Molecular Biology
Fanni Sebak, Janos Szolomajer, Nandor Papp, Gabor K. Toth, Andrea Bodor
Summary: The type of neighboring amino acids, especially aromatic and positively charged sidechains, has been found to affect the cis-Pro content. These findings can assist in the design of protein regions with specific cis-Pro content and contribute to a better understanding of the roles and functions of IDPs.
FRONTIERS IN BIOSCIENCE-LANDMARK
(2023)
Article
Chemistry, Physical
Yu Kihara, Shuntaro Tani, Yamato Higashi, Takahiro Teramoto, Yutaka Nagasawa
Summary: Femtosecond time-resolved transient absorption spectroscopy was used to investigate the excited state dynamics of red-light-absorbing indigo derivatives. The study found that both trans -> cis and trans <- cis photoisomerization have short excited state lifetimes, and are influenced by intramolecular charge transfer.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Physical
Cherrie May Olaya, Norihiko Hayazawa, Nathaniel Hermosa, Takuo Tanaka
Summary: In this study, surface plasmon resonance (SPR) was used to enhance the angular Goos-Hanchen (GH) shift. By focusing the incident beam to a small beam waist, a significant increase in the angular GH shift was induced, while the spatial GH shift was negligible. Despite decreased efficiency in surface plasmon excitation due to the focused geometry, a large enhancement in the angular GH shift was demonstrated.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Optics
Marilou Cadatal-Raduban, Masao Yoshino, Yuui Yokota, Akira Yoshikawa, Norihiko Hayazawa, Daizo Asano, Keito Shinohara, Toshihiko Shimizu, Nobuhiko Sarukura, Kohei Yamanoi
Summary: A scheme for imaging mid-infrared (MIR) wavelengths using pre-excitation-assisted up-conversion luminescence in lanthanide ion-doped Self-organizing Optical Fiber Array (SOFIA) crystal is proposed. The proposed scheme enables MIR wavelength detection and imaging using low-cost optics and silicon-based detectors in the visible spectral region, utilizing trivalent erbium, thulium, holmium, and neodymium for imaging MIR wavelengths.
Article
Chemistry, Multidisciplinary
Francesca Celine I. Catalan, Le The Anh, Junepyo Oh, Emiko Kazuma, Norihiko Hayazawa, Norihito Ikemiya, Naoki Kamoshida, Yoshitaka Tateyama, Yasuaki Einaga, Yousoo Kim
Summary: This study used low-temperature scanning tunneling microscopy to investigate the atomic-scale morphology and electronic structures of boron-doped diamond electrodes. It found that doped diamond surfaces exhibit graphitized domains affected by the dopants, with the graphitization uniquely observed in BDD (111). These observations provide insights into the role of dopants in modulating the conductivity of diamond and other functional doped materials.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Misun Hong, Yasuyuki Yokota, Raymond A. Wong, Norihiko Hayazawa, Emiko Kazuma, Yousoo Kim
Summary: In this study, the application of UPD metals in catalyzing photoreactions of adsorbed molecules under the excitation of surface plasmons was demonstrated. The formation of DMAB was enhanced on the Ag surface deposited via UPD, indicating that the surface of UPD Ag played a catalytic role in the reduction of the nitro group. Overall, surface modification via UPD offers a potential strategy for controllably tuning the surface and interface chemistry.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Lean Dasallas, Rafael Jaculbia, Maria Vanessa Balois-Oguchi, Wilson Garcia, Norihiko Hayazawa
Summary: This study investigated the impact of the detection angle and substrate on the analysis of the polarization properties of 1D dipole emission. The analytical expression of dipole emission was modified using coordinate transformation. The effects of different substrates (free space, dielectric substrate, and metallic substrate) and detection angle on determining the dipole orientation were discussed. This work is significant for analyzing dipole emission signals, particularly in near-field optical spectroscopy based on scanning tunneling microscopy and atomic force microscopy.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Chemistry, Physical
Tong Gao, Ziwei Qian, Hongbo Chen, Reza Shahbazian-Yassar, Issei Nakamura
Summary: A lattice Monte Carlo simulation was developed to study the effect of small ions on lithium dendrite growth. The ions form electrostatic shields and affect the electric-field screening, leading to notable changes in dendrite morphology. Large salts like ionic liquids significantly inhibit dendrite growth, with physical properties playing a key role.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2022)
Article
Physics, Condensed Matter
Maria Herminia M. Balgos, Mary Clare S. Escano, Rafael B. Jaculbia, Tien Quang Nguyen, Elizabeth Ann P. Prieto, Elmer S. Estacio, Arnel A. Salvador, Armando S. Somintac, Masahiko Tani, Norihiko Hayazawa, Yousoo Kim
Summary: By combining STM and spectroscopy with density functional theory calculations, the electronic properties of the subsurface arsenic antisite defect (As-Ga) in undoped gallium arsenide (GaAs) lattice were clearly delineated from those of surrounding As atoms. These results offer insights for surface/subsurface defect engineering at the atomic scale.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Kyoko Masui, Yasunori Nawa, Shunsuke Tokumitsu, Takahiro Nagano, Makoto Kawarai, Hirokazu Tanaka, Tatsuki Hamamoto, Wataru Minoshima, Tomomi Tani, Satoshi Fujita, Hidekazu Ishitobi, Chie Hosokawa, Yasushi Inouye
Summary: In this study, an optical trapping Raman spectroscopic system was developed to quantitatively evaluate the concentration of small objects. Using artificial liposomes that mimic synaptic vesicles, it was found that the optical trapping of vesicles and the detection of spontaneous Raman scattered light can be achieved. The number of glutamate molecules in the trapped liposomes was estimated using a calibration curve, allowing for the measurement of glutamate molecules encapsulated in synaptic vesicles in situ.
Review
Chemistry, Physical
Yasuyuki Yokota, Misun Hong, Norihiko Hayazawa, Yousoo Kim
Summary: This review focuses on the electrochemical applications of tip-enhanced Raman spectroscopy (TERS). TERS combines the advantages of scanning probe microscopy (SPM) and Raman spectroscopy, allowing for high-resolution imaging of surface morphology and chemical information in an electrochemical environment. The review summarizes the pioneering work done on TERS systems in liquid and electrochemical environments, provides an overview of the typical instrumentation used in electrochemical TERS (EC-TERS) based on electrochemical scanning tunneling microscopy (EC-STM), and highlights the advancements in EC-TERS studies of events at interfaces, such as potential-dependent structural changes and electrochemical reactions. Current issues and future prospects of EC-TERS for microscopic studies of electrochemical interfaces are also discussed.
SURFACE SCIENCE REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Hirokazu Tanaka, Kyoko Masui, Ryugo Tero, Hidekazu Ishitobi, Siham Recki, Zouheir Sekkat, Yasushi Inouye
Summary: We have developed an optical microscope based on surface plasmon resonance (SPR) to observe the dynamics of potassium ion (K+) concentrations. By measuring the attenuated total reflection spectra, we confirmed that the ionophore chelation reaction changes the refractive index. We successfully observed the dynamics of K+ concentration change through the K+ channels inserted in the lipid bilayer.
Article
Chemistry, Physical
Maria Vanessa Balois-Oguchi, Norihiko Hayazawa, Satoshi Yasuda, Katsuyoshi Ikeda, Nguyen Tien Quang, Mary Clare Escano, Takuo Tanaka
Summary: Wrinkles are inevitable during the growth of graphene, and they are influenced by the thermal expansion coefficients of graphene and the underlying substrate. The shape and strain variations of micrometer-sized wrinkles have been found to affect the electronic properties of graphene. This study investigates the physical and electronic nature of nanometer-sized wrinkles using tip-enhanced Raman spectroscopy (TERS), which is essential for the characterization of nanodevices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Instruments & Instrumentation
M. H. Balgos, N. Hayazawa, M. Tani, T. Tanaka
Summary: We propose a fast pump modulation scheme in a terahertz time domain spectroscopy (THz-TDS) system by utilizing the megahertz repetition rate of the pump pulse for lock-in detection. This scheme enables rapid data acquisition times and detection of oscillating signals with frequencies up to 10 kHz. The use of an electro-optic modulator (EOM), operated as a pulse picker, allows for directly using the megahertz laser repetition rate as the reference modulation frequency.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Chemistry, Physical
Cameron J. Shock, Mark J. Stevens, Amalie L. Frischknecht, Issei Nakamura
Summary: "In this study, we developed a model to describe the dielectric responses of polar solvents and NaCl solutions. The simulated dielectric constants of these liquids matched well with experimental values, including the significant decrease in the dielectric constant of water upon the addition of NaCl. Furthermore, the simulations predicted an increase in dielectric constant when considering the influence of ion translations and the orientation of permanent dipoles."
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Yuika Saito, Takahiro Kondo, Sora Harada, Ryo Kitaura, Maria Vanessa Balois-Oguchi, Norihiko Hayazawa
Summary: In this study, we used polarization resonance Raman microscopy to investigate the interactions between single-walled carbon nanotubes (SWCNTs) and encapsulated molecules. We focused on C-70 encapsulated in SWCNTs and examined the Raman spectral pattern under different laser polarizations and excitation wavelengths. Our results showed that the resonance Raman process was modulated by a charge transfer contribution between C-70 and SWCNTs, which depended on the incident polarization and excitation wavelength. The intensity of the local electronic field inside a SWCNT was higher for parallel excitation than perpendicular excitation when the nanotubes were bundled.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Materials Science, Multidisciplinary
Tong Gao, Cameron J. Shock, Mark J. Stevens, Amalie L. Frischknecht, Issei Nakamura
Summary: This study develops ensemble neural networks (ENN) as computationally fast surrogate models for Stockmayer fluid molecular dynamics (MD) simulations to determine the dielectric constants of polar solvents and NaCl solutions. The ENNs are trained using only 50-times less data compared to MD simulations, yet their predictions using batch normalization or bagging are in good agreement with the full MD results. The ENN methods are capable of extracting reliable values from statistically noisy data.
MRS COMMUNICATIONS
(2022)
