Results 51 to 60 of about 378,095 (341)

Optical Design of a Slitless Astronomical Spectrograph with a Composite Holographic Grism

Photonics, 2023
In the present work, we consider an optical design of a slitless spectrograph for an existing 0.5 m-class telescope. This design concept has a number of advantages such as compact size, simplicity, and simultaneous coverage of a large field of view.
Eduard Muslimov, Damir Akhmetov, Danila Kharitonov, Erik Ibatullin, Nadezhda Pavlycheva, Vyacheslav Sasyuk, Sergey Golovkin   +6 more
doaj   +1 more source

Structural and functional characterization of chitinase from carnivorous plant Drosera adelae

FEBS Open Bio, EarlyView.
A class I chitinase from the carnivorous plant Drosera adelae was expressed and purified using a yeast system, revealing high enzymatic activity. Structural analyses of the catalytic and chitin‐binding domains identified key tyrosine residues involved in substrate binding, offering insights into the enzyme's adaptation for insect digestion.
Kazunari Yoneda, Yuki Naruse, Yusaku Suizu, Tomohiro Araki, Yoshikazu Hoshi, Haruhiko Sakuraba, Junji Hayashi, Toshihisa Ohshima   +7 more
wiley   +1 more source

Transmissive Suppressed-Order Diffraction Grating (SODG)

, 2019
We present a novel type of Suppressed-Order Diffraction Grating(SODG). An SODG is a diffraction grating whose diffraction orders have all been suppressed except one that is selected to provide electromagnetic deflection.
Caloz, Christophe, Lavigne, Guillaume, Patri, Ashutosh   +2 more
core   +1 more source

Diffraction Focal Position and Vector Diffraction Theory for Micro Holographic Storage Systems

Applied Sciences, 2014
In this study, we proposed a method to determine the optimal focal position for micro-holographic storage systems, using vector diffraction theory; the theory provides exact solutions when the numerical aperture (NA) exceeds 0.6.
Cheol-Ki Min, Hyungbae Moon, Do-Hyung Kim, No-Cheol Park, Kyoung-Su Park, Young-Pil Park   +5 more
doaj   +1 more source

Berberine–cinnamic acid co‐crystal effect in ameliorating hyperlipidemia might be regulated through the PI3K/AKT/mTOR/SREBP‐1 signaling pathway

FEBS Open Bio, EarlyView.
Berberine–cinnamic acid co‐crystal (BBR‐CA) inhibits the phosphorylation of the phosphatidylinositol 3‐kinase (PI3K)/AKT/mammalian target of rapamycin (mTOR) pathway, suppressing the transfer of pre‐sterol regulatory element‐binding proteins‐1 (SREBP‐1) from the endoplasmic reticulum to the nucleus. This results in a decrease in the expression level of
Wenheng Gao, Yunlong Li, Lihua Chen, Wenshuo Yang, Yong He, Ye Yang, Dengke Yin, Song Tan   +7 more
wiley   +1 more source

Gelatin as a Photosensitive Material

Molecules, 2018
Because this issue journal is dedicated to Gelatin, here we present a few applications of gelatin in the field of optics. Optics is the science that studies the production, propagation, interaction and detection of light.
Sergio Calixto, Nina Ganzherli, Sergey Gulyaev, Susana Figueroa-Gerstenmaier   +3 more
doaj   +1 more source

Energy efficiency of a new trifocal intraocular lens [PDF]

Journal of the European Optical Society-Rapid Publications, 2014
The light distribution among the far, intermediate and near foci of a new trifocal intraocular lens (IOL) is experimentally determined, as a function of the pupil size, from image analysis. The concept of focus energy efficiency is introduced because, in
Vega F., Alba-Bueno F., Millán M. S.
doaj   +1 more source

Structural and functional analysis of Bacillus sarcosine oxidase and its activity toward cyclic imino acids

FEBS Open Bio, EarlyView.
Sarcosine oxidase from Bacillus sp. (SoxB) recognizes l‐proline (l‐Pro), d‐proline (d‐Pro), and l‐thioproline (l‐Tpr) as minor substrates. In this study, we measured their absorption spectra, determined the crystal structures of their enzyme complexes, and performed site‐directed mutagenesis of key residues.
Yuqi Zhang, Yoshitaka Nakajima, Masae Kurobe, Tsutomu Nakamura, Tomoki Himiyama, Yoshiaki Nishiya   +5 more
wiley   +1 more source

A Different Perspective on the Solid Lubrication Performance of Black Phosphorous: Friend or Foe?

Advanced Engineering Materials, EarlyView.
Researchers investigate black phosphorous (BP) as a standalone solid lubricant coating through ball‐on‐disc linear‐reciprocating sliding experiments in dry conditions. Testing on different metals shows BP doesn't universally reduce friction and wear. However, it achieves 33% friction reduction on rougher iron surfaces and 23% wear reduction on aluminum.
Matteo Vezzelli, Manel Rodríguez Ripoll, Sabine Schwarz, Ali Erdemir, Maria Clelia Righi, Carsten Gachot   +5 more
wiley   +1 more source

The Infrared Imaging Spectrograph (IRIS) for TMT: Volume phase holographic grating performance testing and discussion [PDF]

, 2014
Maximizing the grating efficiency is a key goal for the first light instrument IRIS (Infrared Imaging Spectrograph) currently being designed to sample the diffraction limit of the TMT (Thirty Meter Telescope). Volume Phase Holographic (VPH) gratings have
Chen, Shaojie, Larkin, James E., Maire, Jerome, Meyer, Elliot, Mieda, Etsuko, Moore, Anna M., Simard, Luc, Wright, Shelley A.   +7 more
core   +2 more sources