scholarly journals Moths are strongly attracted to ultraviolet and blue radiation

2021 ◽  
Vol 14 (2) ◽  
pp. 188-198 ◽  
Author(s):  
Gunnar Brehm ◽  
Julia Niermann ◽  
Luisa Maria Jaimes Nino ◽  
David Enseling ◽  
Thomas Jüstel ◽  
...  
Keyword(s):  
Blue Radiation

Light alteration caused by snow and its importance to subnivean rodents

1972 ◽  
Vol 50 (7) ◽  
pp. 1023-1032 ◽  
Author(s):  
L. N. Evernden ◽  
W. A. Fuller
Keyword(s):  
Mammalian Species ◽  
Red Light ◽  
Visible Spectrum ◽  
Ground Level ◽  
Color Temperature ◽  
Late Winter ◽  
Behavioral Reactions ◽  
Light Levels ◽  
Blue Radiation ◽  
Light Avoidance

Silicon photocells placed in three habitats before snowfall revealed that light levels in the subnivean environment are inversely related to thickness of snow cover. Under 15 cm of snow in the fall, detectable light was sharply reduced. Under midwinter snow depths of 30 to 50 cm no light was detectable by the photocells used and color temperature readings showed greatest penetration to ground level in the red end of the visible spectrum. Sexual maturation of laboratory females of Clethrionomys gapperi was stimulated by white and blue radiation and increased daylength during late winter. Red light was not stimulatory, even over a 16-h day. As in other mammalian species, male voles did not appear to be as strongly photosensitive as females. Captive voles, given a choice of lights of different wavelength and total darkness, exhibited light-avoidance. Thus, the physiological and behavioral reactions of voles to the modified subnivean light regime ensure that subnivean winter breeding does not occur in this species. Factors controlling maturation of microtines that do breed under snow ought to be investigated.

Qualitative and quantitative effects of radiation on pycnidial formation by Dendrophoma obscurans

1976 ◽  
Vol 54 (7) ◽  
pp. 566-571 ◽  
Author(s):  
Frank L. Binder ◽  
V. G. Lilly
Keyword(s):  
Ultraviolet Radiation ◽  
Casein Hydrolysate ◽  
Qualitative And Quantitative ◽  
Near Ultraviolet ◽  
Blue Radiation ◽  
Age Dependent ◽  
Dendrophoma Obscurans ◽  
Effects Of Radiation ◽  
Far Ultraviolet

Cultures of Dendrophoma obscurans grown on a 10:2 glucose: casein hydrolysate medium require radiation for sporulation. Far-ultraviolet (253.7 nm), near-ultraviolet (300–425 nm), and blue radiation (400–525 nm) were effective in initiating pycnidial formation. Exposure of cultures to radiation from 500 to 850 nm did not induce sporulation. Pycnidial formation was found to be photoinduced and age dependent. Low intensities of near-ultraviolet radiation administered over long durations were more effective than high intensities of short durations for inducing pycnidial formation.

scholarly journals Synthesis of Dy3+, Eu3+ and Tb3+ Activated Y2O2S Optoelectronic Phosphors for N-UV LED Applications

2020 ◽  
Vol 9 (4) ◽  
pp. 2068-2074
Keyword(s):  
Solid State Reaction Method ◽  
Yellow Emission ◽  
Strong Line ◽  
Excitation Wavelength ◽  
Excitation Spectra ◽  
Near Ultraviolet ◽  
Red Color ◽  
Blue Radiation ◽  
Bright Color ◽  
Color Emission

In this, a series of iso-structural Y2O2S (RE3+ = Dy3+ , Eu3+ and Tb3+) phosphors were synthesized by high temperature solid state reaction method. All the phosphors exhibit strong line and broad excitation in the near ultraviolet (n-UV) region. Bright color emission in blue, green and red color region of electromagnetic hue cycle was noticed. The concentration of activator doped was optimized from the photoluminescence (PL) study. The quenching in luminescence intensity after particular concentration of dopant is discussed here. Y2O2S phosphor doped with Dy3+displays useful blue and yellow emission bands at 487nm and 574nm, when stimulated by 388nm excitation wavelength. Y2O2S:Eu3+ phosphor displays an orange and red emission at 594nm and 620nm, when stimulated at 396 nm. Whereas, Y2O2S:Tb3+ phosphor displays weak blue radiation in the range 485nm and strong green radiation at 545nm, when stimulated at 305 nm. The excitation spectra used for the Y2O2S:RE3+ (RE3+ = Dy3+ , Eu3+ and Tb3+) phosphor is in the near ultraviolet (n-UV) region spanning from 300 nm to 400 nm, which is a peculiarity of near ultraviolet stimulated LED. The outcome of the RE3+ (RE3+= Dy3+ , Eu3+and Tb3+) absorption on the luminescence properties of Y2O2S:RE3+ phosphors was also studied.

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