Ultraviolet reflectance patterns of male guppies enhance their attractiveness to females

2002 ◽  
Vol 63 (2) ◽  
pp. 391-396 ◽  
Author(s):  
Astrid Kodric-Brown ◽  
Sally C. Johnson
Keyword(s):  
Ultraviolet Reflectance

scholarly journals Silicon Nanotexture Surface Area Mapping Using Ultraviolet Reflectance

2021 ◽  
pp. 1-8
Author(s):  
Giuseppe Scardera ◽  
David Payne ◽  
Muhammad Umair Khan ◽  
Yu Zhang ◽  
Anastasia Soeriyadi ◽  
...  
Keyword(s):  
Surface Area ◽  
Ultraviolet Reflectance

Ultraviolet reflectance and female mating preferences in the common kestrel (Falco tinnunculus)

2008 ◽  
Vol 86 (6) ◽  
pp. 479-483 ◽  
Author(s):  
E. Zampiga ◽  
G. Gaibani ◽  
D. Csermely
Keyword(s):  
Female Mate Choice ◽  
Female Preference ◽  
Visible Spectral Range ◽  
Falco Tinnunculus ◽  
Uv Filter ◽  
Skin Reflectance ◽  
Ultraviolet Reflectance ◽  
Uv Reflectance ◽  
Female Mating Preferences ◽  
Uv Reflection

Previous studies revealed the importance of plumage brightness (considering only the visible spectral range) in female mate choice of common kestrels ( Falco tinnunculus L., 1758). Our study focuses on the effect of UV reflectance on female preference; we hypothesize that common kestrel females prefer males with UV-reflecting plumage and refuse, or are not attracted to, males whose plumage UV reflectance is prevented. We tested the preference of 20 captive females who were given a choice between two males, one behind a UV-transmitting (UV+) filter and another one behind a UV-blocking (UV–) filter. Female preference was measured as frequency and duration of visits to either male, specifically by sitting on the perch or hanging on to the partition wall. Females visited the male behind the UV+ filter more often than the male behind the UV– filter, indicating that females prefer males with UV-reflecting plumage than males without UV reflection. UV plumage and skin reflectance could provide females with information regarding current male conditions more so than other colours and other morphological parameters.

Quantitative Determination of Thiourea in Citrus Fruits

1977 ◽  
Vol 60 (3) ◽  
pp. 699-701
Author(s):  
Bernadette Mandrou ◽  
Suzanne Brun ◽  
Amara Kingkate
Keyword(s):  
Colorimetric Assay ◽  
Colorimetric Method ◽  
Extraction Technique ◽  
Citrus Fruits ◽  
Alumina Column ◽  
Orange Peels ◽  
Ultraviolet Reflectance ◽  
Spectrometric Measurements ◽  
Colorimetric Reaction

Abstract A quantitative method for thiourea determination in orange peels is proposed, with direct reflectance spectrometric measurements on chromatoplates. Thiourea is separated on a silica gel plate with methanol-chloroform (10+90), and the spots are characterized with 2,6-dichloroquinone chloroimide; this colorimetric reaction is unstable, so thiourea is quantitated on the chromatogram by direct ultraviolet reflectance spectrometric measurements at 240 nm. Comparison between this method and the AOAC colorimetric method shows interferences and higher results in the colorimetric assay. By slightly modifying the extraction technique, such as purifying the extract on an alumina column, it is possible to decrease these interferences and to avoid erroneous results with the AOAC colorimetric method. For both methods, colorimetry in solution and reflectometry on chromatoplates, applied after the proposed extraction technique, the sensitivity is about 1 ppm and the reliabilities are similar.

Ultraviolet reflectance and pattern properties in leopard geckos (Eublepharis macularius)

2020 ◽  
Vol 173 ◽  
pp. 104060
Author(s):  
Andran Abramjan ◽  
Veronika Baranová ◽  
Petra Frýdlová ◽  
Eva Landová ◽  
Daniel Frynta
Keyword(s):  
Eublepharis Macularius ◽  
Ultraviolet Reflectance

Far-Ultraviolet Reflectance Spectra of Ionic Crystals

1971 ◽  
Vol 26 (21) ◽  
pp. 1317-1320 ◽  
Author(s):  
G. W. Rubloff ◽  
J. Freeouf ◽  
H. Fritzsche ◽  
K. Murase
Keyword(s):  
Reflectance Spectra ◽  
Ionic Crystals ◽  
Ultraviolet Reflectance ◽  
Far Ultraviolet

Ganymede's Far‐Ultraviolet Reflectance: Constraining Impurities in the Surface Ice

2020 ◽  
Vol 125 (9) ◽  
Author(s):  
P. M. Molyneux ◽  
J. D. Nichols ◽  
T. M. Becker ◽  
U. Raut ◽  
K. D. Retherford
Keyword(s):  
Ultraviolet Reflectance ◽  
Far Ultraviolet ◽  
Surface Ice
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