Article
Microbiology
June Kim, Changwon Kim, Siin Kim, Hyotcherl Ihee, Woonsup Shin, Eui-Jin Kim, Jeong K. Lee
Summary: Rhodobacter sphaeroides mutant BF lacks BchF and accumulates Chlide a and 3V-Bchlide a. This mutant grows photoheterotrophically, implying a functional V-RC, which is confirmed by the emergence of growth-competent suppressors of BC under irradiation. The V-RC has similar electron transfer properties to the WT-RC but has slower electron transfer and a higher midpoint redox potential.
MICROBIOLOGY SPECTRUM
(2023)
Article
Chemistry, Physical
Vytautas Bubilaitis, Olga Rancova, Darius Abramavicius
Summary: Exciton energy relaxation in a bacterial Reaction Center (bRC) pigment-protein aggregate may involve emission of high energy vibrational quanta. The study assessed this hypothesis using vibronic two-particle theory and found that specific high frequency vibrations may be responsible for the excitation relaxation process.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Ying Wang, Ying Xie, Mingyan Gao, Wenxiao Zhang, Lanjiao Liu, Yingmin Qu, Jiajia Wang, Cuihua Hu, Zhengxun Song, Zuobin Wang
Summary: In this study, conductive atomic force microscopy (C-AFM) was used to obtain the electrical and surface morphological information of lambda DNA molecules with different distributions. The results showed that the current flowing through DNA networks was significantly higher than the stretched and random distribution of DNA. Furthermore, the study found that the current of stretched DNA was pH-dependent.
Article
Engineering, Electrical & Electronic
Ryota Fukuzawa, Daichi Kobayashi, Takuji Takahashi
Summary: Electrostatic force microscopy (EFM) is used to examine the electrostatic force between an AFM tip and sample surface, allowing evaluation of their capacitance and surface potential. The dependences of the electrostatic force on dc voltage and ac voltage frequency can be used to investigate carrier density, carrier type, and deep-level states in a semiconductor. Proper distance control is necessary in EFM to ensure accurate measurements, and the oscillation amplitude of a cantilever can be effectively used for feedback control. The 1 A-mode operation in EFM shows good robustness against the strong electrostatic force and allows proper measurements of tip-sample capacitance.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Multidisciplinary
Paolo Pellegrino, Isabella Farella, Mariafrancesca Cascione, Valeria De Matteis, Alessandro Paolo Bramanti, Antonio Della Torre, Fabio Quaranta, Rosaria Rinaldi
Summary: In recent years, Atomic Force Microscope (AFM)-based nanolithography techniques have become increasingly powerful. However, conventional methods are inefficient, have low pattern formation rates, and are complex to execute. In this study, we developed a simple and effective nanopatterning technique called Pulse-Atomic Force Lithography (P-AFL), which enabled us to pattern 2.5D nanogrooves on a thin polymer layer with sub-nanometre resolution, high accuracy, and reproducibility. We investigated the effects of P-AFL parameters on the morphology of 2.5D nanostructures and optimized the nanolithography process to achieve unconventional shape nanostructures with high accuracy and fidelity.
Article
Multidisciplinary Sciences
Daniel Jun, Sylvester Zhang, Adrian Jan Grzedowski, Amita Mahey, J. Thomas Beatty, Dan Bizzotto
Summary: The use of biomacromolecules in clean alternative energies is a developing field, with potential applications in biosensors and biophotovoltaic devices. Research has shown that the assembly of bacterial photosynthetic reaction center (RC) on electrodes and its local environment significantly impact photocurrent generation, with implications for electron transfer of other biomacromolecules in sensor and photovoltaic applications.
Article
Nanoscience & Nanotechnology
Jonas Weber, Yue Yuan, Fabian Kuehnel, Christoph Metzke, Josef Schaetz, Werner Frammelsberger, Guenther Benstetter, Mario Lanza
Summary: Conductive atomic force microscopy (CAFM) is a powerful technique for studying electrical and mechanical properties at the nanoscale. The reliability of probe tips is a major challenge in CAFM, and solid Pt probes offer a more durable and reliable alternative to metal-coated silicon tips. The use of solid Pt probes can enhance the reliability of CAFM experiments by providing similar performance in terms of lateral resolution and a longer lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Xiaoli Huang, Haojie Lai, Junjie Liu, Qiulan Chen, Weiguang Xie
Summary: The contact characteristic and intrinsic conductivity of single MoO2 nanosheet grown by CVD method were investigated. It was found that the contact of Ag with MoO2 was better than that of Au. The measured intrinsic conductivity of MoO2 at low bias condition is as high as (2.5 +/- 1.3) x 104 S/cm. Non-linear behavior in IV characteristic and breakdown behavior were observed with increasing bias due to the contact effect. The supported current density is around 107 A/cm2, indicating that MoO2 is a superior conductive transition metal oxide material for low-voltage applications.
Article
Chemistry, Physical
Owen Thwaites, Bern M. M. Christianson, Alexander J. J. Cowan, Frank Jackel, Lu-Ning Liu, Adrian M. M. Gardner
Summary: Elucidating the photosynthetic processes within RC-LH1 supercomplexes is crucial for understanding natural photosynthetic systems and developing artificial photosynthesis. This study examined the energy transfer in RC-LH1 supercomplexes of Rhodobacter sphaeroides and investigated the roles of transmembrane polypeptides PufX and PufY. The results showed that the absence of PufX increased the excitation energy transfer lifetime and distribution, while the absence of PufY led to conformational changes in LH1 subunits but did not affect the energy transfer lifetime significantly.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Multidisciplinary
Tianyao Zhang, Haibo Yu, Jialin Shi, Xiaoduo Wang, Hao Luo, Daojing Lin, Zhu Liu, Chanmin Su, Yuechao Wang, Lianqing Liu
Summary: This paper proposes an imaging method that combines atomic force microscopy with microlens-based scanning optical microscopy, which can achieve cross-scale rapid imaging and improve the efficiency of large-scale imaging and detection.
Article
Chemistry, Multidisciplinary
Sy Hieu Pham, Anthony Ferri, Antonio Da Costa, M. M. Saj Mohan, Van Dang Tran, Duy Cuong Nguyen, Pascal Viville, Roberto Lazzaroni, Rachel Desfeux, Philippe Leclere
Summary: This study reports the high performance of transparent conductive electrodes (TCEs) based on silver nanowires (AgNWs) percolation networks. By optimizing the deposition conditions, AgNWs exhibit low sheet resistance and high optical transmittance. Conductive atomic force microscopy measurements reveal low resistivity of individual AgNWs and high current levels within the network. Thin-film electrodes based on AgNWs show great potential for future flexible electronic devices.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Multidisciplinary Sciences
Laura Bracun, Atsushi Yamagata, Bern M. Christianson, Tohru Terada, Daniel P. Canniffe, Mikako Shirouzu, Lu-Ning Liu
Summary: The RC-LH1-PufX supercomplex has a unique structure with PufX acting as a molecular cross brace to reinforce the RC-LH1 structure, providing strong photosynthetic function and electron transfer.
Article
Chemistry, Physical
A. Rodriguez, M. S. Jaman, O. Acikgoz, B. Wang, J. Yu, P. G. Grutzmacher, A. Rosenkranz, M. Z. Baykara
Summary: Ti3C2Tx nano-sheets exhibit solid lubrication properties on the nanoscale, reducing friction on silicon dioxide substrates, although not as effectively as few-layer graphene. This paves the way for further investigations into nanoscale solid lubrication achieved by Ti3C2Tx (MXene) nano-sheets.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Applied
L. Richarz, J. He, U. Ludacka, E. Bourret, Z. Yan, A. T. J. van Helvoort, D. Meier
Summary: In this study, moire fringes observed in conductive atomic force microscopy (cAFM) scans obtained on the ferroelectric material Er(Mn,Ti)O-3 were investigated. It was found that these fringes are a result of scanning moire effect, arising from the superposition of raster scanning and sample-intrinsic properties. The findings are important for studying local transport phenomena in moire engineered materials by cAFM and provide a general guideline for distinguishing extrinsic from intrinsic moire effects.
APPLIED PHYSICS LETTERS
(2023)
Article
Microbiology
Haoyu Wang, Xiaoling Sha, Rui Li, Yijing Li, Himel Nahreen Khaleque, Yuxiu Zhang, Tsing Bohu, Zhihui Bai, Xuliang Zhuang
Summary: This study conducted a genome-wide comparative analysis of the strain EBL0706, confirming it as a strain of Luteovulum azotoformans. The genome of EBL0706 contains 4034 protein-coding genes, including a complete photosynthetic gene cluster.