scholarly journals Ultraviolet sensitivity of the cosmological sequester

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Michaela G. Lawrence ◽  
David Seery
Keyword(s):  
Ultraviolet Sensitivity

The ultraviolet sensitivity of Kevlar 149 and Technora fibres

1993 ◽  
Vol 28 (3) ◽  
pp. 785-788 ◽  
Author(s):  
M. G. Dobb ◽  
R. M. Robson ◽  
A. H. Roberts
Keyword(s):  
Ultraviolet Sensitivity

Ultraviolet sensitivity ofBacillus subtilis citD mutants

1978 ◽  
Vol 1 (3) ◽  
pp. 167-170 ◽  
Author(s):  
William F. Burke ◽  
Mark McCammon
Keyword(s):  
Ofbacillus Subtilis ◽  
Ultraviolet Sensitivity

The ontogeny of ultraviolet sensitivity, cone disappearance and regeneration in the sockeye salmon Oncorhynchus nerka

2000 ◽  
Vol 203 (7) ◽  
pp. 1161-1172 ◽  
Author(s):  
I. Novales Flamarique
Keyword(s):  
Sockeye Salmon ◽  
Adult Stage ◽  
Salt Water ◽  
Oncorhynchus Nerka ◽  
The Other ◽  
Small Fish ◽  
Adult Fish ◽  
Long Wavelength ◽  
Electrophysiological Recordings ◽  
Ultraviolet Sensitivity

This study examines the spectral sensitivity and cone topography of the sockeye salmon Oncorhynchus nerka throughout its life history with special emphasis on ultraviolet sensitivity. Electrophysiological recordings from the optic nerve show that ultraviolet sensitivity is greatly diminished at the smolt stage but reappears in adult fish weighing about 201 g. Concomitantly, light microscopy observations of the retina show that ultraviolet cones disappear from the dorsal and temporal retina at the smolt stage but reappear at the adult stage. These changes occur for sockeye salmon raised in fresh water or salt water after smoltification. In contrast to this ultraviolet cycle, the other cone mechanisms (short-, middle- and long-wavelength-sensitive) and the rod mechanism remain present throughout ontogeny. The natural appearance and disappearance of ultraviolet cones in salmonid retinas follows surges in blood thyroxine at critical developmental periods. Their presence coincides with times of prominent feeding on zooplankton and/or small fish that may be more visible under ultraviolet light. It is proposed that the primary function of ultraviolet cones in salmonids is to improve prey contrast.

scholarly journals The spectral transmission of ocular media suggests ultraviolet sensitivity is widespread among mammals

2014 ◽  
Vol 281 (1780) ◽  
pp. 20132995 ◽  
Author(s):  
R. H. Douglas ◽  
G. Jeffery
Keyword(s):  
Energy Level ◽  
Visual Pigment ◽  
High Spatial Resolution ◽  
Mammalian Species ◽  
Visual Pigments ◽  
Spectral Transmission ◽  
Tree Shrews ◽  
Uv Sensitivity ◽  
Ultraviolet Sensitivity ◽  
Ocular Media

Although ultraviolet (UV) sensitivity is widespread among animals it is considered rare in mammals, being restricted to the few species that have a visual pigment maximally sensitive ( λ max ) below 400 nm. However, even animals without such a pigment will be UV-sensitive if they have ocular media that transmit these wavelengths, as all visual pigments absorb significant amounts of UV if the energy level is sufficient. Although it is known that lenses of diurnal sciurid rodents, tree shrews and primates prevent UV from reaching the retina, the degree of UV transmission by ocular media of most other mammals without a visual pigment with λ max in the UV is unknown. We examined lenses of 38 mammalian species from 25 families in nine orders and observed large diversity in the degree of short-wavelength transmission. All species whose lenses removed short wavelengths had retinae specialized for high spatial resolution and relatively high cone numbers, suggesting that UV removal is primarily linked to increased acuity. Other mammals, however, such as hedgehogs, dogs, cats, ferrets and okapis had lenses transmitting significant amounts of UVA (315–400 nm), suggesting that they will be UV-sensitive even without a specific UV visual pigment.

Phaeomelanin versus eumelanin as a chemical indicator of ultraviolet sensitivity in fair-skinned subjects at high risk for melanoma: a pilot study

1998 ◽  
Vol 8 (1) ◽  
pp. 53-58 ◽  
Author(s):  
M R Vincensi ◽  
M d??lschia ◽  
A Napolitano ◽  
E M Procaccini ◽  
G Riccio ◽  
...  
Keyword(s):  
Pilot Study ◽  
High Risk ◽  
Ultraviolet Sensitivity ◽  
Chemical Indicator
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