New Fluorescence Techniques: Are They a Challenge to Laser Use in PDT?

1989 ◽  
Vol 7 (6) ◽  
pp. 23-26
Author(s):  
Walter Alexander
Keyword(s):  
Fluorescence Techniques

Nondestructive Quality Evaluation of Tomatoes

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 544c-544
Author(s):  
A. Hakim ◽  
A. Purvis ◽  
E. Pehu ◽  
I. Voipio ◽  
E. Kaukovirta
Keyword(s):  
Quality Evaluation ◽  
Tomato Fruit ◽  
Quality Attributes ◽  
Internal Quality ◽  
Attractive Alternative ◽  
Fluorescence Techniques ◽  
Nondestructive Quality ◽  
Alternative Techniques ◽  
Evaluation Techniques

Both external and internal quality of fruits such as tomatoes can be evaluated by different methods, but all most all of the methods are destructive. For this reason, there is a need to reassess some of the alternative techniques. Nondestructive quality evaluation is an attractive alternative. The principles of different nondestructive quality evaluation techniques such as optical, physical, and fluorescence techniques applied to tomato fruit is explained. Successful application of these techniques that could be used for evaluation of different quality attributes are illustrated. The advantages of nondestructive quality evaluation techniques are that they are very fast, easy, labor- and time-intensive, and inexpensive. These techniques could also be useful to evaluate the quality of other vegetables.

Induced Fluorescence Techniques for Plant Phenotyping

2020 ◽  
Author(s):  
A. B. Utkin ◽  
A. Cartaxana ◽  
A. Figueiredo ◽  
J. Marques da Silva
Keyword(s):  
Plant Phenotyping ◽  
Fluorescence Techniques

Applications of Non-Dispersive X-Ray Fluorescence Techniques for in Vitro Studies

1973 ◽  
Vol 20 (1) ◽  
pp. 379-388 ◽  
Author(s):  
R. J. Baglan ◽  
A. B. Brill ◽  
J. A. Patton
Keyword(s):  
In Vitro Studies ◽  
X Ray ◽  
Fluorescence Techniques

Sensing of nucleosides, nucleotides and DNA using luminescent Eu complex by normal and time resolved fluorescence techniques

2016 ◽  
Vol 169 ◽  
pp. 173-181 ◽  
Author(s):  
Hassan A. Azab ◽  
Zeinab M. Anwar ◽  
Rasha M. Kamel ◽  
Mai S. Rashwan
Keyword(s):  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Fluorescence Techniques

Fluorescence Techniques for Fundamental and Applied Studies of Membrane Protein Receptors: The 5-HT, Serotonin Receptor

1999 ◽  
Vol 19 (1-4) ◽  
pp. 533-545 ◽  
Author(s):  
Ruud Hovius ◽  
Evelyne L. Schmid ◽  
Ana-Paula Tairi ◽  
Horst Blasey ◽  
Alain R. Bernard ◽  
...  
Keyword(s):  
Membrane Protein ◽  
Serotonin Receptor ◽  
Fluorescence Techniques ◽  
Protein Receptors

Fluorescence of the Complexes of 2-Methylnaphthoate and 2-Hydroxypropyl-α-, -β-, and -γ-Cyclodextrins in Aqueous Solution

2002 ◽  
Vol 56 (12) ◽  
pp. 1579-1587 ◽  
Author(s):  
Antonio Di Marino ◽  
Franscisco Mendicuti
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Anisotropy ◽  
Intensity Ratio ◽  
Driving Forces ◽  
Emission Spectra ◽  
Formation Constants ◽  
Dielectric Constants ◽  
Additional Information ◽  
Fluorescence Techniques ◽  
Naturally Occurring

Fluorescence techniques were employed to study the inclusion complexes of 2-methylnaphthoate (MN) with 2-hydroxypropyl-α-cyclodextrin (αHPCD), 2-hydroxypropyl-β-cyclodextrin (βHPCD), and 2-hydroxypropyl-γ-cyclodextrin (γHPCD). Emission spectra of MN show two vibronic bands whose intensity ratio R is very sensitive to the polarity of the medium. The stoichiometry and formation constants of these complexes were investigated by obtaining R as a function of the cyclodextrin (CD) concentration. Results showed identical stoichiometry (1/1) for the three MN/αHPCD, MN/β-HPCD, and MN/γHPCD complexes. Formation constants at 25 °C were 780 ± 15, 2700 ± 130, and 165 ± 10 M−1, respectively. ΔH0 and ΔS0 were obtained from linear van't Hoff plots. Results reveal that the complexation of MN with αHPCD is enthalpy driven. With βHPCD, both the entropy and enthalpy terms favor the process, whereas the formation of the complex with γHPCD is entropically governed. The extrapolation of R at infinite CD concentration allows us to estimate the effective dielectric constants of the inner CD cavities, which are around 50, but which differ from their counterparts, the naturally occurring α-, β-, and γ-CDs. Fluorescence anisotropy, quencher lifetimes, and average lifetimes can also give additional information about the structure and driving forces accompanying the formation of such complexes.

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