scholarly journals Spectral responses in near-infrared of the mixed compounds III-V, ternary and quaternary, based on GaSb

1993 ◽  
Vol 3 (9) ◽  
pp. 1777-1782
Author(s):  
B. Mbow ◽  
N. Rezzoug ◽  
C. Peremarti ◽  
A. Mezerreg ◽  
C. Llinares
Keyword(s):  
Near Infrared ◽  
Spectral Responses

scholarly journals Spectral Behavior of Pinus elliottii, Subjected to Drought in Southern Brazil

2019 ◽  
Vol 12 (1) ◽  
pp. 179
Author(s):  
Géssyca Fernanda de Sena Oliveira ◽  
Uilian do Nascimento Barbosa ◽  
José Jorge Monteiro Junior ◽  
Diogo José Oliveira Pimentel ◽  
Julianne Moura da Silva ◽  
...  
Keyword(s):  
Water Deficit ◽  
Near Infrared ◽  
Pinus Elliottii ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Spectral Behavior ◽  
Cultivated Plant ◽  
The City ◽  
Santa Maria ◽  
Spectral Responses

The second most cultivated plant to a forest range in Brazil is the Pinus elliottii. This paper aims to evaluate the spectral behavior of individuals of Pinus elliottii in the electromagnetic radiation (1st) of the visible and (2nd) the infrared, when submitted to the water deficit. The experiment was conducted in the city of Santa Maria located at the Rio Grande do Sul State. The spectral responses of 10 individuals of Pinus elliottii were observed in different climatic seasons at 24 months of age. To evaluate the spectral behavior a spectroradiometer was used, and the behavior in the 450 to 1700 nm range was analyzed. Five individuals were submitted to water deficit treatment and five were used as controls, remaining in adequate water conditions. The spectral pattern for individuals submitted to water deficit was similar, but a trend of wavelength responses in the region of visible green (577-491 nm) and near-infrared (1100-789 nm) was noticeable. The most evident differences occurred in the fall season when differences in spectral amplitudes are noticeable and significantly different from the rest of the year.

scholarly journals Identification of Rice Sheath Blight through Spectral Responses Using Hyperspectral Images

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6243 ◽  
Author(s):  
Fenfang Lin ◽  
Sen Guo ◽  
Changwei Tan ◽  
Xingen Zhou ◽  
Dongyan Zhang
Keyword(s):  
Leaf Blade ◽  
Near Infrared ◽  
Spectral Feature ◽  
Sheath Blight ◽  
Peak Amplitude ◽  
Blue Edge ◽  
Red Edge ◽  
Tree Classifier ◽  
Significant Difference ◽  
Spectral Responses

Sheath blight (ShB), caused by Rhizoctonia solani AG1-I, is one of the most important diseases in rice worldwide. The symptoms of ShB primarily develop on leaf sheaths and leaf blades. Hyperspectral remote sensing technology has the potential of rapid, efficient and accurate detection and monitoring of the occurrence and development of rice ShB and other crop diseases. This study evaluated the spectral responses of leaf blade fractions with different development stages of ShB symptoms to construct the spectral feature library of rice ShB based on “three-edge” parameters and narrow-band vegetation indices to identify the disease on the leaves. The spectral curves of leaf blade lesions have significant changes in the blue edge, green peak, yellow edge, red valley, red edge and near-infrared regions. The variables of the normalized index between green peak amplitude and red valley amplitude (Rg − Ro)/(Rg + Ro), the normalized index between the yellow edge area and blue edge area (SDy − SDb)/(SDy + SDb), the ratio index of green peak amplitude and red valley amplitude (Rg/Ro) and the nitrogen reflectance index (NRI) had high relevance to the disease. At the leaf scale, the importance weights of all attributes decreased with the effect of non-infected areas in a leaf by the ReliefF algorithm, with Rg/Ro being the indicator having the highest importance weight. Estimation rate of 95.5% was achieved in the decision tree classifier with the parameter of Rg/Ro. In addition, it was found that the variety degree of absorptive valley, reflection peak and reflecting steep slope was different in the blue edge, green and red edge regions, although there were similar spectral curve shapes between leaf sheath lesions and leaf blade lesions. The significant difference characteristic was the ratio index of the red edge area and green peak area (SDr/SDg) between them. These results can provide the basis for the development of a specific sensor or sensors system for detecting the ShB disease in rice.

Calculated and measured spectral responses in near-infrared of III–V photodetectors based on Ga, In, and Sb

1994 ◽  
Vol 141 (2) ◽  
pp. 511-525 ◽  
Author(s):  
B. Mbow ◽  
A. Mezerreg ◽  
N. Rezzoug ◽  
C. Llinares
Keyword(s):  
Near Infrared ◽  
Spectral Responses

scholarly journals Various responses of single-walled carbon nanotubes with differing chirality: A suggestion for biosensing

2019 ◽  
Vol 28 (1) ◽  
pp. 51-56 ◽  
Author(s):  
Kazuo Umemura ◽  
Yu Sato ◽  
Yu Ishibashi ◽  
Masahito Ito ◽  
Yoshikazu Homma
Keyword(s):  
Carbon Nanotubes ◽  
Physicochemical Properties ◽  
Near Infrared ◽  
Single Walled Carbon Nanotubes ◽  
Photoluminescence Intensity ◽  
Single Walled Carbon ◽  
Near Infrared Spectra ◽  
Walled Carbon Nanotubes ◽  
Antioxidant Effects ◽  
Spectral Responses

The near infrared absorbance and near infrared photoluminescence intensity of several single-walled carbon nanotubes (SWNTs) with different chiralities in the same suspension were analyzed. Differing chirality of the SWNTs showed different spectral responses with adsorbed H2O2 and catechin. While the detection of the antioxidant effects of catechin and Japanese tea using hybrids of DNA and SWNTs have previously been reported, those studies did not focus on the effects of chirality of the SWNTs on near infrared spectra. Chirality of SWNTs is one of the most important parameters to determine SWNT physicochemical properties. For example, the responses of (10,5)/(8,7) were more drastic in contrast to (9,4), while the (6,5) SWNTs were inactive. The findings indicate that different information can be obtained using mixed chiralities of SWNTs. The data suggest that the chirality effects reported from various studies should be evaluated carefully, considering the different SWNT chiralities.

Construction of a near-infrared responsive upconversion nanoplatform against hypoxic tumors via NO-enhanced photodynamic therapy

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7875-7887 ◽  
Author(s):  
Ying Lan ◽  
Xiaohui Zhu ◽  
Ming Tang ◽  
Yihan Wu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Near Infrared ◽  
Upconversion Nanoparticles

A near-infrared (NIR) activated theranostic nanoplatform based on upconversion nanoparticles (UCNPs) is developed in order to overcome the hypoxia-associated resistance in photodynamic therapy by photo-release of NO upon NIR illumination.

A nitroreductase-activatable near-infrared theranostic photosensitizer for photodynamic therapy under mild hypoxia

2020 ◽  
Vol 56 (43) ◽  
pp. 5819-5822
Author(s):  
Jing Zheng ◽  
Yongzhuo Liu ◽  
Fengling Song ◽  
Long Jiao ◽  
Yingnan Wu ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Triplet State ◽  
Near Infrared ◽  
Mild Hypoxia

In this study, a near-infrared (NIR) theranostic photosensitizer was developed based on a heptamethine aminocyanine dye with a long-lived triplet state.

Fluorescent proteins for in vivo imaging, where's the biliverdin?

2020 ◽  
Vol 48 (6) ◽  
pp. 2657-2667
Author(s):  
Felipe Montecinos-Franjola ◽  
John Y. Lin ◽  
Erik A. Rodriguez
Keyword(s):  
Hydrogen Peroxide ◽  
In Vivo Imaging ◽  
Near Infrared ◽  
Fluorescent Protein ◽  
Fluorescent Proteins ◽  
Fluorescent Imaging ◽  
Infrared Light ◽  
Red Fluorescent Protein ◽  
Color Palette

Noninvasive fluorescent imaging requires far-red and near-infrared fluorescent proteins for deeper imaging. Near-infrared light penetrates biological tissue with blood vessels due to low absorbance, scattering, and reflection of light and has a greater signal-to-noise due to less autofluorescence. Far-red and near-infrared fluorescent proteins absorb light >600 nm to expand the color palette for imaging multiple biosensors and noninvasive in vivo imaging. The ideal fluorescent proteins are bright, photobleach minimally, express well in the desired cells, do not oligomerize, and generate or incorporate exogenous fluorophores efficiently. Coral-derived red fluorescent proteins require oxygen for fluorophore formation and release two hydrogen peroxide molecules. New fluorescent proteins based on phytochrome and phycobiliproteins use biliverdin IXα as fluorophores, do not require oxygen for maturation to image anaerobic organisms and tumor core, and do not generate hydrogen peroxide. The small Ultra-Red Fluorescent Protein (smURFP) was evolved from a cyanobacterial phycobiliprotein to covalently attach biliverdin as an exogenous fluorophore. The small Ultra-Red Fluorescent Protein is biophysically as bright as the enhanced green fluorescent protein, is exceptionally photostable, used for biosensor development, and visible in living mice. Novel applications of smURFP include in vitro protein diagnostics with attomolar (10−18 M) sensitivity, encapsulation in viral particles, and fluorescent protein nanoparticles. However, the availability of biliverdin limits the fluorescence of biliverdin-attaching fluorescent proteins; hence, extra biliverdin is needed to enhance brightness. New methods for improved biliverdin bioavailability are necessary to develop improved bright far-red and near-infrared fluorescent proteins for noninvasive imaging in vivo.

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