Conversion of phycocyanobilin-binding GAF domain to biliverdin-binding domain

Cyanobacteriochromes (CBCRs) are biliprotein photoreceptors that only exist in cyanobacteria and have a broad spectral response range from ultra-violet to far-red. The red/green-type CBCRs can show red/green reversible photoconversion via a covalently bound phycocyanobilin (PCB). In recent years, several CBCRs binding with not only PCB but also biliverdin (BV) have been discovered, which raises the possibility of CBCRs being applied as optogenetic tools. Through molecular modification, we hope to engineer BV-binding CBCRs responsive to the near-infrared spectral region (650–900 nm), of which the red/green type of CBCRs are suitable resources for experimentation. Here, we use Slr1393g3 (the third GAF domain of a red/green photoswitching CBCR from Synechocystis sp. PCC 6803) as a template to perform such molecular evolution using both random mutagenesis and site-directed mutagenesis. After several rounds of random mutagenesis, we obtained several BV-binding variants of Slr1393g3. These BV-binding variants have a maximal absorbance at ̃690 nm and a fluorescence at ̃720 nm. Additionally, some of them have remarkable photochromicity between a far-red light-absorbing state and a red light-absorbing state. Based on the primary amino acid sequence and structural models, the Phe474 surrounding ring D of BV is thought as a crucial site for chromophore selectivity.

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Inline biofilm monitoring based on near-infrared spectroscopy with ultracompact spectrometer technology

NIR news ◽

10.1177/0960336020978716 ◽

2020 ◽

Vol 31 (7-8) ◽

pp. 9-13

Author(s):

Robert Zimmerleiter ◽

Elisabeth Leiss-Holzinger ◽

Eva Maria Wagner ◽

Kathrin Kober-Rychli ◽

Martin Wagner ◽

...

Keyword(s):

Near Infrared ◽

Spectral Response ◽

Principal Component ◽

Cost Effective ◽

Sensor Surface ◽

Chain Reaction ◽

Microelectromechanical System ◽

Infrared Spectral ◽

Infrared Measurement ◽

Polymerase Chain

In this article, we demonstrate a promising inline near-infrared measurement scheme for 24/7 biofilm monitoring based on cost-effective microelectromechanical system-based spectrometer technology. The shown near-infrared spectral data, acquired at a beer-canning line during a representative time span of 10 days, are analyzed by means of principal component analysis and the performance of the monitoring system and its capability to identify biofilms on its sensor surface are investigated by comparing spectral response with results of offline polymerase chain reaction measurements of smear samples. Correlations between presence of a biofilm and its thickness with scores on PC1 and PC2, respectively, were observed.

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An optical system for remote sensing in the UV, visible, and NIR spectral ranges

Computer Optics ◽

10.18287/2412-6179-co-611 ◽

2020 ◽

Vol 44 (2) ◽

pp. 195-202

Author(s):

V.M. Vladimirov ◽

V.A. Yukseev ◽

E.G. Lapukhin

Keyword(s):

Remote Sensing ◽

Optical System ◽

Near Infrared ◽

Ultra Violet ◽

Field Of View ◽

Structural Elements ◽

Earth Remote Sensing ◽

Infrared Spectral ◽

Uv Visible ◽

Spectral Ranges

In this work, we propose a high-resolution optical system for Earth remote sensing, operating at 200-3300-nm wavelengths and providing a 4º field of view. Parameters of the system's structural elements are calculated and presented. Dot charts of the spots of confusion for the center, intermediate zones, and the edge of the field are considered. Over most of the operating wavelengths, the optical system is shown to be diffraction-limited, which provides attaining the highest possible spatial resolution. This system is considered as a tool for monitoring of the Earth's surface and collection of information in the ultra-violet, visible and near infrared spectral ranges (200-3300 nanometers).

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Polymer–polymer solar cells with a near-infrared spectral response

Journal of Materials Chemistry A ◽

10.1039/c5ta01042j ◽

2015 ◽

Vol 3 (13) ◽

pp. 6756-6760 ◽

Cited By ~ 29

Author(s):

Weiwei Li ◽

Yang An ◽

Martijn M. Wienk ◽

René A. J. Janssen

Keyword(s):

Solar Cells ◽

Electron Donor ◽

Electron Acceptor ◽

Near Infrared ◽

Bulk Heterojunction ◽

Polymer Solar Cells ◽

Spectral Response ◽

Heterojunction Solar Cells ◽

Bulk Heterojunction Solar Cells ◽

Infrared Spectral

Four different thiazole-flanked diketopyrrolopyrrole-based polymers were applied as an electron acceptor in bulk heterojunction solar cells with poly(3-hexylthiophene) as an electron donor.

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Enhancing the Near-Infrared Spectral Response of Silicon Optoelectronic Devices via Up-Conversion

IEEE Transactions on Electron Devices ◽

10.1109/ted.2007.903197 ◽

2007 ◽

Vol 54 (10) ◽

pp. 2679-2684 ◽

Cited By ~ 108

Author(s):

Bryce S. Richards ◽

Avi Shalav

Keyword(s):

Near Infrared ◽

Spectral Response ◽

Optoelectronic Devices ◽

Infrared Spectral

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Nanostructure Formation in Silicon Photovoltaic Cells by Femtosecond Laser Pulses

Materials Science Forum ◽

10.4028/www.scientific.net/msf.670.118 ◽

2010 ◽

Vol 670 ◽

pp. 118-121 ◽

Cited By ~ 2

Author(s):

A.M. Taleb ◽

K.A. Al-Naimee ◽

S.F. Abdalah ◽

Riccardo Meucci ◽

F.T. Arecchi

Keyword(s):

Femtosecond Laser ◽

Room Temperature ◽

Near Infrared ◽

Spectral Response ◽

Photovoltaic Cells ◽

Laser Pulses ◽

Photovoltaic Cell ◽

Femtosecond Laser Pulses ◽

Irradiation Effect ◽

Infrared Spectral

The experimental evidence of the effect of femtosecond laser pulses on the spectral response of a Silicon photovoltaic cell is demonstrated and investigated. The response of this device is covering the visible to near infrared spectral region. The responsivity of the photovoltaic cell is enhanced from 0.18A/W (0.5A/W to 0.85 A/W) to 0.25A/W, this means that the conversion efficiency increases from about 9% to about 14% due to irradiation effect. All treatments and measurements have been done at room temperature. The observed enhancement is related to the appearing of nano-structured groves in the 700-900 nm range.

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CuPc/C 60 heterojunction photodetector with near-infrared spectral response

Materials Letters ◽

10.1016/j.matlet.2017.05.004 ◽

2017 ◽

Vol 201 ◽

pp. 137-139 ◽

Cited By ~ 11

Author(s):

Gaoyao Wei ◽

Zhong Lu ◽

Yichen Cai ◽

Chenghua Sui

Keyword(s):

Near Infrared ◽

Spectral Response ◽

Infrared Spectral

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Down-Conversion Polymer Composite Coatings with Multipeak Absorption and Emission

Coatings ◽

10.3390/coatings11030282 ◽

2021 ◽

Vol 11 (3) ◽

pp. 282

Author(s):

Jun Fang ◽

Wenting Liu ◽

Wenying Zhou ◽

Cheng Zhu ◽

Yaru Ni ◽

...

Keyword(s):

Solar Cells ◽

Uv Light ◽

Spectral Response ◽

Composite Coatings ◽

Red Light ◽

Polymer Coatings ◽

Absorption And Emission ◽

Response Range ◽

Luminescent Coatings ◽

Down Conversion

Spectral adjustment is an effective method to increase light conversion efficiency of solar cells and to promote the growth of plants. Down-converter (DC) materials are considered to be one of the most effective methods of spectral modification. The focus of this work was to expand the spectral response range of down-conversion layers to achieve multipeak absorption and emission. Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu, which have different excitation peaks in the UV-blue region and varied emission peaks in visible light regions, were prepared in this work. Sr2CaMoO6:Sm,Na can effectively produce red light at 648 nm upon excitation at 408 nm, while YVO4:Bi,Eu can produce red light at 618 nm upon excitation at 365 nm. Polymeric luminescent coatings with one single kind of phosphor were prepared separately before the two phosphors were mixed together in uniform polymer coatings. The two phosphors were also assembled in bilayer coatings with different concentrations. The results showed that high transmittances over 90% were achieved for the two composite coatings with the thickness of 20 and 30 μm. The increase in particle loadings from 1‰ to 4‰ slightly decreased coating transmittance but increased luminescence intensity. The increase in the ratio of Sr2CaMoO6:Sm,Na and YVO4:Bi,Eu from 5/1 to 10/1 resulted in high transmittance of the DC coatings, independent of total filler loadings (3‰ and 4‰) and coating thickness. The relative intensities of emission peaks can be adjusted conveniently by changing filler ratios. In addition, the transmittance and luminescent intensities of the coatings where the two phosphors were assembled in two layers were close to the uniform coatings, suggesting the negligible effect of UV light irradiation order. This work proved that the prepared coatings presented multipeak absorption and emission upon UV light excitation. These coatings can be expected to be applied in fields such as solar cells and agriculture greenhouses.

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Highly sensitive polymer photodetectors with a broad spectral response range from UV light to the near infrared region

Journal of Materials Chemistry C ◽

10.1039/c5tc01383f ◽

2015 ◽

Vol 3 (28) ◽

pp. 7386-7393 ◽

Cited By ~ 46

Author(s):

Wenbin Wang ◽

Fujun Zhang ◽

Lingliang Li ◽

Miao Zhang ◽

Qiaoshi An ◽

...

Keyword(s):

Active Layer ◽

Near Infrared ◽

Uv Light ◽

Spectral Response ◽

Infrared Region ◽

Response Range ◽

Highly Sensitive ◽

Near Infrared Region

Highly sensitive polymer photodetectors with a broad spectral response range from UV light to the near infrared region based on P3HT : PTB7-Th : PC71BM as the active layer are reported.

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Integrated near-infrared spectral sensing

Nature Communications ◽

10.1038/s41467-021-27662-1 ◽

2022 ◽

Vol 13 (1) ◽

Author(s):

Kaylee D. Hakkel ◽

Maurangelo Petruzzella ◽

Fang Ou ◽

Anne van Klinken ◽

Francesco Pagliano ◽

...

Keyword(s):

Near Infrared ◽

Prediction Models ◽

Spectral Response ◽

Resonant Cavity ◽

Industrial Process ◽

Chemical Information ◽

Minimal Size ◽

Spectral Reconstruction ◽

Infrared Spectral ◽

Spectral Sensing

AbstractSpectral sensing is increasingly used in applications ranging from industrial process monitoring to agriculture. Sensing is usually performed by measuring reflected or transmitted light with a spectrometer and processing the resulting spectra. However, realizing compact and mass-manufacturable spectrometers is a major challenge, particularly in the infrared spectral region where chemical information is most prominent. Here we propose a different approach to spectral sensing which dramatically simplifies the requirements on the hardware and allows the monolithic integration of the sensors. We use an array of resonant-cavity-enhanced photodetectors, each featuring a distinct spectral response in the 850-1700 nm wavelength range. We show that prediction models can be built directly using the responses of the photodetectors, despite the presence of multiple broad peaks, releasing the need for spectral reconstruction. The large etendue and responsivity allow us to demonstrate the application of an integrated near-infrared spectral sensor in relevant problems, namely milk and plastic sensing. Our results open the way to spectral sensors with minimal size, cost and complexity for industrial and consumer applications.

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