scholarly journals Studies on the fluorescence characteristics of fluorescamine derivatives.

1981 ◽  
Vol 29 (8) ◽  
pp. 2283-2289 ◽  
Author(s):  
TOSHIYUKI SAKANO ◽  
SACHIKO MASUDA ◽  
TAMEYUKI AMANO
Keyword(s):  
Fluorescence Characteristics ◽  
Fluorescamine Derivatives

scholarly journals N-Doped Carbon Quantum Dots as Fluorescent Bioimaging Agents

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 789
Author(s):  
Shih-Fu Ou ◽  
Ya-Yun Zheng ◽  
Sin-Jen Lee ◽  
Shyi-Tien Chen ◽  
Chien-Hui Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Nanomaterials ◽  
Graphene Quantum Dots ◽  
Carbon Quantum Dots ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Fluorescence Characteristics ◽  
And Staphylococcus Aureus

Graphene quantum dots, carbon nanomaterials with excellent fluorescence characteristics, are advantageous for use in biological systems owing to their small size, non-toxicity, and biocompatibility. We used the hydrothermal method to prepare functional N-doped carbon quantum dots (N-CQDs) from 1,3,6-trinitropyrene and analyzed their ability to fluorescently stain various bacteria. Our results showed that N-CQDs stain the cell septa and membrane of the Gram-negative bacteria Escherichia coli, Salmonellaenteritidis, and Vibrio parahaemolyticus and the Gram-positive bacteria Bacillus subtilis, Listeria monocytogenes, and Staphylococcus aureus. The optimal concentration of N-CQDs was approximately 500 ppm for Gram-negative bacteria and 1000 ppm for Gram-positive bacteria, and the exposure times varied with bacteria. N-Doped carbon quantum dots have better light stability and higher photobleaching resistance than the commercially available FM4-64. When excited at two different wavelengths, N-CQDs can emit light of both red and green wavelengths, making them ideal for bioimaging. They can also specifically stain Gram-positive and Gram-negative bacterial cell membranes. We developed an inexpensive, relatively easy, and bio-friendly method to synthesize an N-CQD composite. Additionally, they can serve as a universal bacterial membrane-staining dye, with better photobleaching resistance than commercial dyes.

scholarly journals Effects of nitrogen application rate on the photosynthetic pigment, leaf fluorescence characteristics, and yield of indica hybrid rice and their interrelations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jinfeng Peng ◽  
Yuehua Feng ◽  
Xiaoke Wang ◽  
Jie Li ◽  
Guiling Xu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Hybrid Rice ◽  
Photosynthetic Pigment ◽  
Application Rate ◽  
Maturity Stage ◽  
Nitrogen Application ◽  
Fluorescence Characteristics ◽  
Heading Stage ◽  
Indica Hybrid Rice ◽  
Nitrogen Application Rate

AbstractA field experiment employing the rice cultivars Qyou6 and Yixiangyou2115 as materials and different nitrogen application rates was conducted in Huangping County, Guizhou Province in 2019 to determine the effects of nitrogen application rate on photosynthetic pigments, leaf fluorescence characteristics, yield, and their interrelations in indica hybrid rice. The results showed that photosynthetic pigment contents generally increased with increasing nitrogen application rate. As the nitrogen rate increased, the maximal quantum yield of PSII (Fv/Fm), actual quantum yield of PSII (ΦPSII), and relative electron transfer rate at PSII (ETR) first decreased and then increased at the booting stage; Fv/Fm and ΦPSII decreased while ETR first increased and then decreased at the heading stage; nevertheless, Fv/Fm and ΦPSII first decreased and then increased but ETR was just the opposite at the maturity stage. Non-photochemical quenching coefficient (qN) and quantum yield of regulatory energy dissipation at PSII (Y(NPQ)) first increased and then decreased whereas quantum yield of non-regulatory energy dissipation at PSII (Y(NO)) first decreased and then increased at the booting, heading, and maturity stages with increasing nitrogen application rate. Photochemical quenching coefficient (qP) showed an increasing trend as the nitrogen rate increased in the range of 150–300 kg/ha at the heading and maturity stages. Photosynthetic pigments, leaf fluorescence characteristics, and yield and its components were significantly correlated. First, chlorophylls a and b were significantly negatively correlated with Fv/Fm while significantly positively correlated with qP at the heading stage. Secondly, Carotenoids were significantly positively correlated with the effective panicle number (EPN) at the booting stage while significantly negatively correlated with the spikelets per panicle (SPP) at the heading stage. Chlorophyll a and carotenoids were significantly positively correlated with EPN but significantly negatively correlated with spikelet filling (SF) at the maturity stage. In addition, qP was significantly negatively correlated with EPN at the booting stage. At the heading stage, Fv/Fm and Y(NO) were significantly negatively correlated with EPN and SPP, respectively, and Fv/Fm and ΦPSII were significantly positively related to SF. Moreover, qP was extremely significantly positively related to EPN whereas Fv/Fm was extremely significantly negatively correlated with grain yield at the maturity stage. Appropriate nitrogen application rates can enhance photosynthetic pigment contents, improve the photochemical efficiency and proportion of the open part of the reaction center of PSII, and promote the quantum efficiency and self-protection ability of PSII, thereby increasing photosynthetic efficiency and yield. Under the conditions adopted in this experiment, a parabolic relationship was observed between the nitrogen application rate and grain yield. The regression analysis results showed that the best nitrogen application rate of indica hybrid rice is 168.16 kg ha−1 and the highest yield is 11,804.87 kg ha−1.

Fluorescence characteristics of 5-aminoquinoline in acetonitrile: Water

2011 ◽  
Vol 164 (3) ◽  
pp. 197-200 ◽  
Author(s):  
J.P. Bridhkoti ◽  
H.C. Joshi ◽  
S. Pant
Keyword(s):  
Fluorescence Characteristics

scholarly journals Study on the Fluorescence Characteristics of CdTe and Charged Coumarin-Contained Polymer Blending System

2013 ◽  
Vol 25 (2) ◽  
pp. 675-681
Author(s):  
Xu Wang ◽  
Lichao Li ◽  
Deben Chen ◽  
Anyong Zhong
Keyword(s):  
Polymer Blending ◽  
Fluorescence Characteristics

Studies on One-Step Preparation of Multi-Color Fluorescent Carbon-Doped Silica Biological Nanomaterials

2013 ◽  
Vol 340 ◽  
pp. 362-365
Author(s):  
Wei Wei Xiong ◽  
Jing Guo ◽  
Xi Chen ◽  
Cheng Yi Zhang
Keyword(s):  
Preparation Method ◽  
The Other ◽  
Fluorescent Substance ◽  
Carbon Doped ◽  
Fluorescence Characteristics ◽  
One Step ◽  
Fluorescent Carbon

The research concentrates on the preparation of the Nontoxic multi-color fluorescent substance. Fluorescent substance in biology exists two major shortcomings, one is that they are toxic and the other is that they are relatively monotonous, only emitting light of a single color. In response to this situation, we propose a new preparation method of multi-color, non-toxic fluorescent substance and study its fluorescence characteristics.

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